China Safety Science Journal

Progress and perspective of data-driven train delay propagation

WEN Chao, LI Zhongcan, HUANG Ping, TIAN Rui, MOU Weiwei, LI Li

2019, 29(S2): 1-9. doi:10.16265/j.cnki.issn1003-3033.2019.S2.001

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The research aims to summarize and analyze the latest progress of train delay propagation and to clarify the application status of data-driven methods. Firstly, the connotation of delay propagation wasexpounded, and the delay propagation process was analyzed.The researches on delay propagation driven by traditional mathematical methods were analyzed. Next, the data-driven models of train delay propagation werereviewed, and the application of statistical models, computational intelligence, and machine learning models wereanalyzed for delay prediction and delay recoverywhich are two key issues fordelay propagation. Finally, the shortcomings of existing researches were concludedfrom four aspects andthe trend of future research was pointed out.The results show thatthe proposed train delay propagation and recovery models based on artificial intelligence and deep learning can assist dispatchers in improving the quality of dispatching decisions and reducing the workload of dispatchers.

Optimized decomposition algorithm for train-set scheduling of high-speed railway network

ZHONG Qingwei, ZHANG Yongxiang, WEN Chao, PENG Qiyuan, WANG Mengmeng

2019, 29(S2): 10-17. doi:10.16265/j.cnki.issn1003-3033.2019.S2.002

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The train-set scheduling optimization problem with multiple train-sets and multiple depots considering maintenance requirementswas investigated, and a novel two-stage decomposition algorithm was proposed. Firstly, a multi-commodity flow-based MILP optimization model for train-set schedulingwithout consideringmaintenance requirementswas established to obtain multiple candidates train-set schedules. Thenbased on the multiple candidate train-set schedules generated in the first stage, the second stage of the algorithm generated a set of feasible paths for each single train-set unit, where a path allocation sub-problem with maintenance constraints was developed to check the maintenance feasibility. The results show that the proposed optimization approach can save foureight-car size train sets, reduce the total deadhead mileage by 38.4% and save 3% operating cost compared to the manual schedule, and that the operation efficiency of train-setcan be further improvedthrough a more flexible way of composition.

Support vector regression models for delay time predicting considering high-speed rail facility failure

TANG Yixiong, XU Chuanling, WEN Chao, LI Zhongcan, SONG Shaojie

2019, 29(S2): 18-23. doi:10.16265/j.cnki.issn1003-3033.2019.S2.003

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In order to accurately predict the total delay time caused by train fault, the support vector regression model was established by soft margin SVR method (ε-SVR) and fault tolerance ratio SVR (ν-SVR) method on the basis of real operation data of HSR obtained from Guangzhou Railway Bureau. The primary delay time, the number of affected trains and delay causes were set as the independent variables while the total influenced time was the dependent variable. The predictive ability assessment was carried out using the testing data, and the results show that the predicting accuracies of both ε-SVR and ν-SVR model are over 0.8 when the permitted error was within 20%, and that ν-SVR model has a higher predicting accuracy than ε-SVR model.

Study on loading and unloadingoperation plan based on safety operation distance

SONG Junzhe, WEI Yuguang

2019, 29(S2): 24-29. doi:10.16265/j.cnki.issn1003-3033.2019.S2.004

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In order to optimize the scheduling scheme of rail-mountedgantry crane and reduce the interference of safe distance to the operation ofloading and unloading equipment, a hybrid scheduling model of flexible range of rail-mountedgantry crane was established, and the loading and unloading task allocation scheme was determined by dynamically adjusting the distance between rail-mounted gantry cranes. The model usedgenetic algorithm to establish the time-position matrix to approximate the position of the gantry crane at each time point. To verify the validity of the model, an example with 65 shipment tasks was selectedto carry out case study. The results show that the flexible range hybrid scheduling model can reduce the total time of loading and unloading tasks by 4.10% and the deadhead time of rail-mountedgantry crane by 7.24% on the premise of ensuring the safe distance between rail-mountedgantry cranes.

Influence factor analysis of railway passenger transportation safety based on SEM

XIE Anna, YIN Panpan, WANG Zhiyuan

2019, 29(S2): 30-34. doi:10.16265/j.cnki.issn1003-3033.2019.S2.005

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With the rapid development of China's railway, more and more people choose railway for transportation for which safety is the most basic guarantee. In order to ensure railway passenger safety, impacts of five aspects of staff, passengers, equipment, management and environment were discussed according to its basic theory. Secondly SEM of railway passenger transportation security was constructed, hypothetical relation was put forward, and questionnaire was designed and sent out with some railways as examples. Then SPSS25.0 software was used to analyze validity of the questionnaire and Amos17.0 was utilized to verify the model's hypothetical relation. Finally, fitting coefficients generated were compared with standard indicators to test whether they are within the range of the latter, and appropriate correction was made until fitting indexes are standard so as to determine major influence factors. The results show that staff, equipment, management and environment are positively related with railway passenger transportation safety which can be improved with better staff management, equipment safety, station and train environment.

Study on accident causation analysis method based on safety indicator monitoring

LI Mo, YAN Fei, NIU Ru, SONG Hanwei, WANG Yanmei, XIANG Nannan

2019, 29(S2): 35-40. doi:10.16265/j.cnki.issn1003-3033.2019.S2.006

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In order to improve system safety, it is necessary to identify its control defects and take measures to eliminate or manageharmful factors. Causationanalysis based on STAMP (CAST) method was extended, and on the basis of systematic theories, violated safety assumptions in accidents were identified built onanalysis of safety control defects. Then specific safety indicators were put forward to monitor hidden dangers in system operation. Finally, with accidentsin Taiwan railway as an example, a number of safety indicators for operation of puyuma train were proposed, including product selection, operation maintenance, organization management and other aspects. The results show that this method could detect control defects in train operation, and the safety index proposed is reasonable and effective.

Research on operation safety of traction power supply system based on accident statistics analysis

WANG Zhigang

2019, 29(S2): 41-46. doi:10.16265/j.cnki.issn1003-3033.2019.S2.007

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In order to improve professional management of traction power supply and ensure operational safety of traction power supply system, database was established based onkey items like time, location, impact, cause and responsibility of traction power supply accidents by using statistical analysis methodand considering characteristics of traction power supply. Then qualitative analysis was carried out from different dimensions,trend and law of accidents were summarized,main factors affecting system's operational safety were found and suggestions proposed.The results show that accidents have been declining in recent years. The system's operation safetyis greatly affected byexternal environment. Accidents caused by overturning rod, breaking line and collapse of catenary are more frequent and have a greater impact.

Application test of LTE-M in PIS for urban rail transit system

ZHANG Heng, WANG Hongwei

2019, 29(S2): 47-50. doi:10.16265/j.cnki.issn1003-3033.2019.S2.008

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In order to improve the safety protection ability of the PIS based on Wireless Local Area Network (WLAN) LTE-M which can provide stable transmission rate was applied as the main method of PIS train ground communications to ensure the quality of video transmission.Thetransmission quality of LTE-M carrying PIS services was evaluated from the perspective ofbasic transmission performance, carrying indexes of simulated services and video transmission effect, and the dynamic test was carried out in Beijing Subway Line 5.The results show that the LTE-M technology with the 5MHz configuration can basically meet the needs of PIS service, that the handoff performance needs to be improved when wireless free wave is taken as the transmission medium, and that it is recommended to use leaky cable to improve the coverage quality of LTE-M and achieve better vehicle-to-ground communication transmission performance.

Application of integrated network management in work safety of railway communication network

LI Yan

2019, 29(S2): 51-56. doi:10.16265/j.cnki.issn1003-3033.2019.S2.009

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In order to effectively improve monitoring quality of railway communication network performance so as to prevent network fault in advance and strengthen quality management of network application, based on characteristics and basic functions of integrated network management, problems of lower work efficiency and quality in network performance monitoring and data statistics due to scattered setting and insufficient capacity of professional network management were discussed by combing content of quality management in work safety of railway communication network. Then functional requirements for application of integrated network management were analyzed, such as real-time performance monitoring and data statistical analysis, and specific implementation schemes were expounded. The research shows that functional development based on characteristics of centralized data collection of integrated network management can effectively make up for deficiencies of professional network management functions and capabilities, improve quality and efficiency of performance monitoring and data statistical analysis, and therefore improve the work safety management of railway communication network.

Safety analysis of railway track irregularity

CHAI Guanhua, LIU Weidong

2019, 29(S2): 57-61. doi:10.16265/j.cnki.issn1003-3033.2019.S2.010

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For the sake of strengthening safety management of railway operations, the restriction conditions for maintaining track regularity were studied. Firstly, based on test data of a certain railway collected by track measurer and safety inspection car, track geometric dimensioning and interaction relationship of vehicle and track were analyzed, and factors that affect track irregularity under comprehensive action of related infrastructure deformation, train operation, maintenance and repair were identified. Then combined with actual situation of maintenance and repair, the typical maintenance methods for different track diseases were summarized. Finally, it systematically explained that the track, as a basic part of railway infrastructure and an important part in direct contact with the wheel set of locomotive and vehicle, its regularity played an important role in safe, smooth and fast train operation. The results show that different track irregularities have various effects on the safe and stable operation of locomotive and vehicle, that track irregularity is affected by many factors such as deformation of infrastructure, interaction of vehicle/track and maintaince mode, and that track irregularity can be controlled by scientific and reasonable maintenance and repair.

Research on proactive defensemethodin train control systemfor urban rail transit

LI Xiang, BU Bing, ZHU Li

2019, 29(S2): 62-68. doi:10.16265/j.cnki.issn1003-3033.2019.S2.011

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Forthe purpose of improving the information security protection capacity of communication-based train control system while facing sophisticated information attacks,a quantitative method for attack and defense of train control system wasestablished anda proactive defense mechanism was designedbased on game theory. Firstly, the information security risks of train control system were analyzed from three aspects including access, equipment and communicationaccording to network architecture and application characteristics of train control system, so as to reveal the basic types andmethod of attacks.Then the attack-defense quantization method was established with the consideration of attributes of both attack means and targets. And themulti-stage attack-defense game model was built on the basis of stage characteristics ofattacks. Finally, the proposed model was verified by simplified attack-defense behavior database. The results show that the model proposed can outputattack-defense strategies under rational conditions.

Comparison and selection of construction methods of super large section railway tunnel in dolomite stratum

REN Shiguo

2019, 29(S2): 69-76. doi:10.16265/j.cnki.issn1003-3033.2019.S2.012

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The paper was aimed at exploring the adaptability of construction methods of the three-line super-large section tunnel in dolomite stratum of Chengdu-Kunming Railway. Based on the physical and mechanical tests of surrounding rocks, five construction methods of new dolomite tunnel were simulated by the FLAC^3D program. According to the time-space effect of the transverse and longitudinal deformation of surrounding rocks, the deformation response and adaptability of the super large section dolomite tunnel under various working conditions were analyzed. The results show that in order to better control the deformation of the tunnel cavity during tunnel excavation, the cross diaphragm (CRD) method should be preferred, followed by the double-wall guide pit method, that different construction methods have the greatest influence on the tunnel invert, that in the excavation process, the earlier the step is excavated, the later the deformation is affected by the disturbance, while the later the step is excavated, the more the pre-deformation is sensitive to disturbance, that by adding a temporary inverted arch and center diaphragm, the excavation section is divided into a plurality of closed excavation faces, which not only helps to control the deformation of the tunnel, but also has a good control effect on the extrusion deformation of the face, and that theoretical conclusions about the tunnel construction methods in dolomite stratum can provide guidance for deformation control of similar large cross-section tunnels of Sichuan Tibet railway.

Jacking construction method and control measures of frame bridge on soft soil foundation

ZHAO Yongchuan, ZHANG Ning

2019, 29(S2): 77-81. doi:10.16265/j.cnki.issn1003-3033.2019.S2.013

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In order to avoid safety and quality accidents such as subgrade collapse, bridge body cracking and line deformation in jacking construction of frame bridge on soft soil foundation, construction method and control measures of using rail fastening and concealed excavation jacking were introduced with jacking construction of five hole frame bridge of 14 m-17 m-5 m-17 m-14 m-14 m of Jishan line K157 + 171.43 as an example. Then they were analyzed and compared with jacking method of lines reinforced by supporting pile of military variable beam and that of open excavation. The results show that jacking method of hidden excavation and track fastening reinforcement has the advantages of small investment, strong applicability, small impact on railway transportation and controllable safety risk. At the same time, control measures in construction of jacking frame bridge in soft soil foundation with high groundwater level, quality control of construction precipitation and grouting reinforcement are the key to prevent collapse and line deformation during jacking, which has guiding significance for similar construction in the future.

Research on SGSN Pool technology in GSM-R data service security

LI Lei

2019, 29(S2): 82-87. doi:10.16265/j.cnki.issn1003-3033.2019.S2.014

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In order to improve the security and reliability of SGSN which is the core equipment of data service in GSM-R, the redundancy mode of SGSN equipment in GSM-R network was analyzed briefly, the technology of SGSN pool was studied in detail, and the working principle, key parameters, redundancy advantages, networking mode and the conditions of integration with existing networkof SGSN pool were explored. The results show that this technology realizes the SGSN pool group working mode, breaks the one-to-one control relationship between the base station controller (BSC) and SGSN, and realizes the intra domain connection routing function from the BSC node to multiple SGSN nodes, and thatSGSN serves large service area in pool group mode, improves the reliability of the core network, and realizes the redundancy backup of SGSN level.

Research on technical scheme of railway communication network security management center

ZHANG Weijun

2019, 29(S2): 88-92. doi:10.16265/j.cnki.issn1003-3033.2019.S2.015

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In order to improve the ability of network security protection of railway communication network, the current situation of application of railway communication network and the existing network security risks were summarized and analyzed. Guided by Cybersecurity Law of the People's Republic of China and Baseline for Classified Protection of Cybersecurity, research on system architecture, core capabilities and key technologies was carried out. The railway operation management system was taken into consideration, and the management requirements of centralized monitoring of network security, early warning of events, security situation awareness, security compliance detection and unified operation and maintenance of security business were discussed. The overall technical framework and deployment proposal of network security center were proposed. The results show that the proposed technology scheme can provide technical support for the construction and implementation of ″one center, three protection″ network security protection system of railway communication network.

Investigation and analysis of the railwaypassenger transportsafety inspection

SUN Yi

2019, 29(S2): 93-98. doi:10.16265/j.cnki.issn1003-3033.2019.S2.016

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In order to strengthen railway passenger transportation safety supervision and ensurethe safety and health rights of passengers,actual conditions of railway passenger transportation in China were analyzed based on theories of railway transportation safety management and safety service chain management and statistical analysis methods. Accordingto current regulations, standards, supervision departments' work priorities and the status quo of railway passenger transport service enterprises,the railway passenger transport safety research indicators for daily research and Spring Festival survey were designedrespectively. In theyear of 2018, on-site investigation was conducted. On this basis, the existing problems of security inspection work were analyzed, and corresponding improvement suggestionswere put forward.The results show that the safety inspection of railway passenger transport in China has good effect, but there are still some problems, and that it is necessary tomake effortsto improve the quality management of safety construction, increase investment in equipment and facilities, and further improve the safety inspection of passenger transport.

Study on influence of safety risk and hidden danger management on railway safety

LI Shuo, YUAN Yingqun

2019, 29(S2): 99-103. doi:10.16265/j.cnki.issn1003-3033.2019.S2.017

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In order to eliminate safety risks and hidden danger of railway and realize safe railway transportation, firstly, risk and hidden danger management of various industries at home and abroad was analyzed, and state requirement for establishing a dual prevention mechanism for risks and hazards was described. Then, leading experience of some local governments was introduced in detail, and current situation of railway risk and hidden danger management was explained. Finally, it was pointed out that there were some problems in railway enterprises, such as concept confusion of safety risk and hidden danger, enlargement of risk management, and lack of a safety hidden danger management system.The results show that railway enterprises should improve their risk management system, implement double prevention mechanism, strengthen information construction and adopt other means to promote railway transportation safety.

Mechanism research of tramcar collision based on S-O-R

WANG Lieni, MOU Ruifang, LAI Jie, YANG Jianming, GOU Zhibo

2019, 29(S2): 104-110. doi:10.16265/j.cnki.issn1003-3033.2019.S2.018

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In order to prevent tramcar collision, the tramcar collision mechanism was studied systematically. According to operation characteristics of tramcarand the S-O-R model, the process of tramcar driver's handing danger weredivided into three stages: perception, judgment and operation. Through the analysis of evolution process of collisions caused by errorin each phase, it is concluded that the tramcar collisions can be format by three ways, and in the condition of which collisions mechanism model was constructed on the basis ofphysical model. The results show that each error can cause collision, and the possibility of collision caused by perception error is the maximum, that caused by judgment error takes second place, and that caused by operation error is the minimum.

Application of training system to reform of railway driving qualification examination

ZHU Xi, YANG Baokun, QIN Zhuangzhuang, XU Weijun

2019, 29(S2): 111-117. doi:10.16265/j.cnki.issn1003-3033.2019.S2.019

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In order to promote the high-quality development of railway, it is proposedto integrate EMU post training system into the railway driving qualification test, and add EMU driving simulation test subjects. Relevantsuggestions on the examination subjects were put forward. EMU drivers in the vocational skills training section of Wuhan high-speed railwaywere selectedas the research object. By comparing the advantages and disadvantages of EMU simulation driving test and real carandreal scene test, it is found thatthe EMU simulation driving test has advantages ofsafety and effciency, and it is necessary to add EMU simulation driving subjects.According to the conclusion of the research, suggestions wereput forward for the content of EMU driving test and the implementation of EMU driving test, focusing on the fault handling assessment of EMU equipments and vehicles and improving the requirements for candidates, so as to further promote the reform of railway driving qualification examination.

Train dispatching quality evaluation based on train delay recovery in high-speed railway

LI Li, YAN Di, TIAN Rui, WANG Quanquan

2019, 29(S2): 118-125. doi:10.16265/j.cnki.issn1003-3033.2019.S2.020

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In order to objectively evaluate dispatchers' operation ability, a dispatching quality evaluation method based on train delay and recovery environment was established by using actual train operation data. Firstly, delay recovery was regarded as a gray box problem. The regularity of delay and delay recovery under different operation conditions were analyzed on the basis of the actual train performance data, and the multi-dimensional train delay environment and the delay recovery environment were constructed. Then a three-tier evaluation system framework including evaluation objects, evaluation indicators and constraints was established, and the evaluation steps and grading criteria of high-speed railway dispatching quality were proposed. Finally, the actual train delay sequence was selected to evaluate the dispatching quality and verify the availability of the evaluation method. The results show that the proposed quality evaluation method based on the establishment of the delay and recovery environment can provide a relatively objective evaluation conclusion for train dispatching level within a certain time range.

Evaluation of passenger's safety in urban rail transit station

ZHOU Jun

2019, 29(S2): 126-133. doi:10.16265/j.cnki.issn1003-3033.2019.S2.021

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In order to prevent passenger accidents and ensure passenger flow safety, AHP and fuzzy comprehensive evaluation model are used to study passenger flow safety situation.Firstly, frequently occurring passenger safe issues were analyzed, all kinds of influencing factors were summarize, and an index system was constructed. Then AHP was used together with experts consulting to determine index weight, and fuzzy comprehensive evaluation methodwas applied to construct the model, determining the membership function and then getting the final result. Finally, with Guangzhou Railway Station as an example, evaluation results of its passenger safety was obtained analyze andsome suggestion for better safety management was put forward.This results show that this model can provide objective evaluation on passenger safety from perspectives of staff quality, equipment safety, operation environment and emergency rescue, thus helping improving passenger safety management in railway stations.

Safety evaluation system for high-speed passenger railway station based on GUI

SONG Yuxin

2019, 29(S2): 134-137. doi:10.16265/j.cnki.issn1003-3033.2019.S2.022

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In order to ensure safety of high-speed railway passenger stations and improve safety supervision of its transportation, a graphical user interface (GUI) is used to construct a safety evaluation system of the station.Firstly, a safety evaluation indicator system was constructed from four levels. Then entropy weight method was usedto determine objective weight and subjective weight.Finally, a safety evaluation system based on GUI was established. The results show that this evaluation system comprehensively considers the subjective and objective weights of indicatorsand visually displays safety status of multiple stations as well as compare them hierarchically, thus playing a supporting decision-making role in safety supervision and management of of high-speed railway passenger stations.

Formal safety analysis method based on Petri net

YU Jingzhi, YAN Fei, NIU Ru

2019, 29(S2): 138-143. doi:10.16265/j.cnki.issn1003-3033.2019.S2.023

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In order to solve the problems oflimitation in description of fault logicand time-consuminganalysis in the traditional safety analysis method, a formal safety analysis method based on Petri net model was proposed. Firstly, the system physical hierarchy was divided, and the functional structure model of systemwas established. Secondly, considering the functional failure state of the component exceptfor normal state and physical fault state, and the transition relationship between multiple states, combined with dynamic logic and fuzzy logic, the fault mode were combed, and the probability value was quantified. A fault Petri net model was established and the safety analysis was carried out. Finally, the feasibility of the proposed method was verified by a case study of the ATP subsystem of urban rail transit. The results show that the Petri net model analyzes the fault source of the subsystem logic output function as the speed motor interface fault, and deduces the fault propagation path to guide the hazard identification and fault diagnosis.

Application of QFD in security service quality evaluation of railway passenger station

XIE Anna, YIN Panpan, WANG Zhiyuan

2019, 29(S2): 144-148. doi:10.16265/j.cnki.issn1003-3033.2019.S2.024

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In order to improve security service quality of railway passenger stations and strengthen safety management, QFD was used to evaluate service quality according to required quality standard of stations. Firstly, relationship matrix was established between security service indicators by expert. Secondly, safety indicators at the same level were screened out based on maximum relation degree principle and safety technical indicators that are most related to the quality of the safety function were found out to form a judgment matrix and to calculate their importance. Then passengers' satisfaction was obtained from it and ]safety service quality was evaluated. Finally effectiveness and practicability of the model was verified with a railway passenger station as an example. The results show that QFD is reliable in evaluating the quality of railway passenger security services. It can find out main factors that affect service quality and thus help improve in this part.

Safety evaluation of high-speed railway passenger station

LI Chengrui, ZHAO Ming, YIN Panpan, LIU Meichi, MA Letao

2019, 29(S2): 149-153. doi:10.16265/j.cnki.issn1003-3033.2019.S2.025

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For the sake of scientific and effective safety evaluation of high-speed railway passenger stations, factors which have impact on itssafety were analyzed considering its characteristics ofcrowded and fast moving passengers and complex safety management. Then an index system of safety evaluation was established and fuzzycomprehensiveevaluation method was put forward. Finally, it was applied to a high-speed railway passenger station in northeast Chinafor safety evaluation. The results show that fuzzy comprehensive evaluation method is suitable for evaluation featured with multiple objectives and qualitative indicators,andit is reliable and practical in safety evaluation of high-speed railway passenger stations.

An intrusion detection system for CBTC based on network traffic and packets

CHEN Xueqian, BU Bing

2019, 29(S2): 154-160. doi:10.16265/j.cnki.issn1003-3033.2019.S2.026

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In order to solve the problem of security risks faced by CBTC systems, an IDS based on network traffic and packets was proposed to detect typical attacks of CBTC systems in real time, such as the denial of service (DoS) and data tempering attacks. Firstly, thecharacteristics of CBTC system and impacts of cyber attacks on CBTC system wereanalyzed. Thenthe IDS was designedbased onCBTC system. In the packet detection module, self-organizing maps (SOM) neural networkswere used to improve the density-based spatial clustering of applications with noise (DBscan) method. And the traffic detection module based on auto regression (AR) algorithmwas combined with packet detection module. Finally, the IDS was tested on CBTC simulation platformand its performance was verified. The results show that the IDS can detect attacks in CBTC system by alerting the characteristics of network traffic and packets, so as to improve the information security protection ability of CBTC system.

An intrusion detection system based on network traffic and device states for CBTC

SONG Yajie, BU Bing

2019, 29(S2): 161-167. doi:10.16265/j.cnki.issn1003-3033.2019.S2.027

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In order to improve the ability of information security protection of CBTC, intrusion detection technologies were studied based on the information of network traffic and equipment status. Firstly, according to the characteristics of CBTC, the impacts of different attacks on system were analyzed. Then detection models based on network traffic and equipment status were established to identify system abnormalities. Finally, the Hidden Markov Model (HMM) was applied to build a classifier, and the anomaly detection results were fused to distinguish between system faults and malicious intrusion. The results show that the proposed intrusion detection system (IDS) can realize the detection of various attacks through collection, processing and analysis of information, so as to improve the information security protection ability of CBTC.

Research on safety monitoring system for railway workers based on Beidou

YANG Meihao, PAN Peifen

2019, 29(S2): 168-173. doi:10.16265/j.cnki.issn1003-3033.2019.S2.028

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Research on safety monitoring system based on BDS was proposed to improve the working efficiency of railway workersand themanagement quality.The high-precision positioning technology of Beidou was combined with Geographic Information System (GIS), electronic fence, map-matching and other auxiliary technologies. Theaccurate location recognition and reliable information-sharing were realizedthrough carrier phase difference technology and theunified platform of railway mobile data transmission. The results show thatthe proposed system integrates the issuing and receiving functions of the operation schedule, and checksthe work progress, and thatwhenworkers enter or leave the work area in violation of the regulation, or the distance between workers and vehicles is dangerous, the system automatically sends the early warning signal to the positioning terminal, which can remind workers to quickly evacuate to the safe area and realize the real time scheduling and control of personnel.

Study on causes of frost damage of ice covering on lining in cold region tunnelsand forecast and early warning technology

YAN Xiaodong, WU Yimin, XU Peng, FU Helin, MENG Chao, QIN Hong

2019, 29(S2): 174-180. doi:10.16265/j.cnki.issn1003-3033.2019.S2.029

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Inorder tohelp solve ice problem on the lining surface to ensure operation safety in cold region tunnels, the causes and early warning technology of icingwere studied. Firstly,main types of icing problems in tunnelswere summarized,reasons for failure of waterproof and insultation measures were analyzed. And then, a maintenance joint structure and freezing forecast and prewarning method were proposed to deal with the icing problem. Finally, the tunnel icing prediction and early warning system based on Internet of Things technology was used to guide deicing work. The results show that waterproofing layer is injured by surrounding rock pressure and shear force during service, tunnel drainage system is silted and blocked during operation, and compressed insulation layer between the initial support and the second lining gradually failed under the freeze-thaw cycles, all of these leading to the failure of waterproof and insultation measures, and that the maintenance joint structure introduces the drainage hole, the seal ring and the maintenance hole, which realizes the renewal of the seal ring.

Prediction of different types of train delay of Guangzhou-Shenzhen high-speed railway

HU Rui, XU Chuanling, FENG Yongtai, WEN Chao, WANG Quanquan

2019, 29(S2): 181-186. doi:10.16265/j.cnki.issn1003-3033.2019.S2.030

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In order to ensure that high-speed railway trains operate according to schedule and reduce the risk of potential traffic conflicts, the delay of high-speed trains and their propagation rules were studied by using the train operation performance. Firstly, through the descriptive statistical analysis of the actual train operation data of the Guangzhou-Shenzhen high-speed railway, the primary delay distribution of the train operation was obtained. Secondly, the hierarchical clustering algorithm was used to analyze the delayed trains, and four kinds of delayed train sequences were obtained. Based on this, the delay feature variables were extracted. Finally, the random forest model was used to predict delay time of all kinds of delay train sequences. The results show that combined with the random forest model, the accuracy of predicting delay time of four kinds of delayed trains is more than 84%.

Research on establishing rapid response system for railway traffic accident rescue

WEN Xiaojie

2019, 29(S2): 187-194. doi:10.16265/j.cnki.issn1003-3033.2019.S2.031

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In order to improve the emergency rescue efficiency of railway traffic accidents and minimize the loss and impact of railway traffic accidents, the current situation of rescue work was analyzed, the existing problems and disadvantages of rescue management work were found out, and the ways and methods to solve them were studied and explored. The mechanism of monitoring, forecasting, early warning, rapid response and emergency rescue of railway traffic accidents was formed. The three-dimensional and multi-angle rapid response network of railway traffic accident rescue was established featuring ″horizontal to side, vertical to the end″, which coordinates parties from Railway General to railway companies and transportation stations, from railway department to local professional department, from railway system rescue force to emergency rescue force of the whole society. The proposed system can realize the rapid and efficient rescue of railway traffic accidents, help to minimize the loss and impact of railway traffic accidents, and bring the emergency rescue management of railway traffic accidents into a regularized and institutionalized pattern.

Application of GIS technology in intelligent decision for railway emergency rescue

LIU Wenbin, LI Congxu, WEI Xiaojuan, XIONG Weiping, WANG Hu

2019, 29(S2): 195-200. doi:10.16265/j.cnki.issn1003-3033.2019.S2.032

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In view of low efficiency of emergency rescue in high-speed railway and inability to reflect accident situation in time, GIS technology and high-performance Web-side development platform (NodeJS) framework were proposed to build a 3D scene. This technology realized three-dimensional simulation of accidental trains,query of surrounding equipment and facilities,planning of optimal emergency rescue route and animation simulation of rescue route. Itis verified with KunMing Bureau as an example which provides a scientific basis for railway transportation scheduling departments to make emergency rescue decision-making analysis.

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