China Safety Science Journal

Analyzing academic effect of Heimlich's safety theory

LI Jie, CHEN Weijiong

2017, 27(9): 1-7. doi:10.16265/j.cnki.issn1003-3033.2017.09.001

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In order to know the academic effect impact of the Heinrich's research on safety science, articles citing the Industrial Accident Prevention were analyzed by using the scientometrics methods and visualization techniques. The results show that the book has been cited extensively since its first edition appeared in 1931, that it is cited by authors in more than 50 countries/territories, especially by those in USA, China, and England, that the main institutions citing the book are the Delft Univ Technol and Univ Illinois, that the main authors citing the book are LI Qiming and SWUSTE P, researchers in the fields of construction safety and safety history, that the citations involve mainly the engineering, public, and environmental and occupational health areas, that the citing publications are on safety management, safety performance, construction industry and safety culture, by that the book has a deep influence on authors, territories/institutes, topics and related articles in safety science.

An outline of safety culturology

WANG Bing, WU Chao

2017, 27(9): 8-13. doi:10.16265/j.cnki.issn1003-3033.2017.09.002

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In order to establish a SC complete discipline system, and promote the safety culturology's research and development, a definition was proposed for the safety culturology based on the existing safety culturology's research and practice achievements, and its connotation was analyzed. Based on this, four basic issues of safety culturology (including research object, research scope, research content and research purpose) were dissected. Meanwhile, the safety culturology's disciplinary foundation and five discipline branches (including safety folklore culturology, safety culture semiotics, safety culture historiography, safety culture psychology and comparative safety culturology) were discussed in detail. The results show that the construction of safety culturology has a solid foundation in both the theoretical and practical aspects, and the safety culturology's discipline system established in this paper can provide a clear outline of the safety culturology's basic issues, disciplinary foundation and discipline branches.

Safety physiology characteristics of bicyclists on reverse riding conditions

LI Yan, HU Wenbin, ZHANG Xingyu, NAN Sirui, ZHOU Wenhui

2017, 27(9): 14-19. doi:10.16265/j.cnki.issn1003-3033.2017.09.003

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The safety physiology characteristics of bicyclists on reverse riding conditions were studied for the purpose of reducing the influences of reverse riding on traffic flow and health condition of bicyclists, and improving roadway safety. High-resolution video cameras were utilized to obtain the proportion of reverse riding vehicles at three arteries' cross sections in Xi'an. The fitness wristband and cellphone were utilized to measure the riding speed and heart rate of the bicyclists. The time-domain theory was applied to compare the HRV characteristics between common and reverse riding. Corresponding improvements on reverse riding, including appropriate traffic management and control measures and the optimization of traffic facilities, were also provided to lead healthy and safe riding. The results indicate that there are more electrical reverse riding bicycles, however the traditional bicycle has a larger proportion of reverse riding. Reverse riding will lead to lower riding speed, higher heart rate and lower HRV, which may cause the sympathetic nerve hypertonia and be harmful to bicyclists.

Differences between construction workers in hazard cognition

HAN Yu, LIU Jialun, ZHANG Jingjie, FENG Zhida

2017, 27(9): 20-26. doi:10.16265/j.cnki.issn1003-3033.2017.09.004

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First, the results of construction workers' hazard cognition of different accidents are obtained by using the psychometric paradigm. Then the differences between construction workers in hazard cognition are explored by making a classification and a comparison. At last, in order to improve construction workers' hazard cognition, some deeper problems are analyzed based on the cognitive psychology, which include characteristics of hazard cognition's result, change rules of hazard sensitivity, causes of hazard cognition bias. The results show that the results of hazard cognition are related to the degree of stimulation of hazard characteristics to workers and the sensitivity of workers to the stimulation closely. Under the same conditions, there is a large difference between workers in the perception of the hazards having low potential for damaging, a high occurrence frequency, visual indication, and good controllability, and the hazards are liable to be underestimated easily, that there is a danger of adaptation among workers , resulting in a decrease in hazard sensitivity and a lack of hazard perception, and that the main reasons of the workers' hazard cognition bias are the decrease of hazard sensitivity, the excessive subjectivity of hazard cognition and the overvaluation of hazard response ability.

Study on unsafe behavior of metro construction workers

ZHAO Tingsheng, ZHANG Miao, LIU Wen, ZHOU Wei

2017, 27(9): 27-32. doi:10.16265/j.cnki.issn1003-3033.2017.09.005

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For the sake of preventing the metro construction safety accidents, the formation mechanism of and factors influencing unsafe behavior of metro construction workers were studied by means of theoretical analysis and practice investigation considering the complicated characteristics of metro construction. Firstly, the formation mechanism was analyzed based on behaviorism and cognitive theory and behavioral binding theory. Then, combined with the questionnaire survey, the EFA was used to simplify and reduce the original data. Finally, an SEM was built to explore the causal relationship between the influence factors and unsafe behavior of metro construction workers. The results show that the unsafe behavior of metro construction workers is the result of interaction between stimulus factors and constraint factors, and that both the working environment and psychological state have the greatest impact on it, and experience and skills have minimal impact on it.

Effects of safety cues on inhibition of attention return of miners different in degree of burnout

YIN Zhongkai, SHI Fengran, LI Naiwen, NIU Lixia

2017, 27(9): 33-38. doi:10.16265/j.cnki.issn1003-3033.2017.09.006

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To explore effects of safety signs on inhibition of attention return of high and low burnout miners, experiments were carried out on 2 groups of testees, a group of 20 miners at a high degree of burnout and a group of 20 miners at a low degree of burnout, by using safety signs without auxiliary words and those with auxiliary word as 2 different stimulating cues. IOR performances were analyzed for the miners in the 2 groups on the basis of both the reaction time and correct rate basis. The results show that under the 2 kinds of stimulation cues, for the 2 groups of testees, the IOR phenonmenon occurs in all time intervals, and there is no significant different between the 2 groups of testees in IOR amount when the auxiliary text cues are absent, and that when the auxiliary text cues exist, high burnout individuals' quantity of inhibition of return is significantly greater than that of the low burnout individuals, which means text clues can regulate the IOR.

Research on influences of mobile navigation modes on driving behavior

PENG Dandan, TIAN Wei, SHI Jing

2017, 27(9): 39-44. doi:10.16265/j.cnki.issn1003-3033.2017.09.007

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In order to study the influences of mobile navigation on driving behaviors, simulated driving experiments and the eye movement experiments were designed and carried out, then the visual parameters and the vehicle driving state parameters were obtained. Through the variance and the significance analysis, differences in driving behavior under different mobile phone navigation modes were explored. The results indicate that all mobile phone navigation modes have a certain impact on driving behavior, resulting in distracted driving to a degree as a function of the mode, that hand-held mobile phone navigation reduces most significantly the drivers' attention to both the front area and the left side, in this navigation mode, the increase in the average glancing number is also the largest and the driver has the most frequent search for the visual area, that the drivers maintain stability by reducing the speed, the lagest decline extent in speed can be attributed to hand-held phone navigation, and that the vehicle's longitudinal velocity standard deviation is more concentrated when using mobile navigation, and the driver's control of the vehicle is strengthened.

Study on similar material to soft coal seam for gas outburst simulation experiment

HE Shengquan, JIN Longzhe, LI Yage, LU Yao, LI Yudan, HE Xueqiu

2017, 27(9): 45-50. doi:10.16265/j.cnki.issn1003-3033.2017.09.008

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In order to explore the law of gas outburst in soft coal seam, similar materials, which were different each other in composition, were prepared on the basis of orthogonal experiments. In the similar materials, sodium humate solution was used as a cementing agent and pulverized coal as aggregate. The effects of mass fraction of sodium humate in the solution, moisture content and other parameters on the mechanical, adsorption and other properties of similar materials were studied by means of range analysis and data fitting. The results show that the mass fraction of sodium humate in the solution plays a major role in controlling the mechanical properties of similar materials, that both the molding moisture and the mass fraction of sodium humate in the solution have a significant impact on the gas adsorption and desorption characteristics of similar material, the cumulative desorption volume, and the gas adsorption volume increases with the increase in the mass fraction of sodium humate in the solution, that the cumulative desorption volume decreases with the increase of moisture content, and the gas adsorption volume increases with the gas pressure increasing, that the permeability of similar materials changes with the increase of mass fraction of sodium humate in the solution as a negative exponential function.

On efficiency of evacuation from multi-floor metro station based on microscopic simulation

WANG Xudong, ZHONG Ming, LIU Shaobo

2017, 27(9): 51-56. doi:10.16265/j.cnki.issn1003-3033.2017.09.009

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In order to objectively assess the efficiency of evacuation from complex multi-floor buildings, simulations were carried out for different scenarios of evacuation from a three-floor subway station by using the CityFlow microscopic pedestrian evacuation simulation model. Effect of occupant distribution, escalator operation status and way-finding behaviors on the evacuation results were analyzed quantitatively. A concept of "floor evacuation efficiency" was proposed to get rid of the uncertainties induced by evacuation scenario setup for evacuation from multi-floor buildings, based on which an objective evacuation efficiency evaluation method was discussed. The results show that adding an escalator E3 to the station reduces the evacuation time by 9.8%, that allowing most of the people to choose the stair S2 reduces the evacuation time by 16.9%, that the farther an area from the exits is, the stronger the effect adjustments in evacuation scenarios on it will be, that the improvement of evacuation efficiency largely depends on the balance and coordination between all the evacuation paths, and that the floor evacuation efficiency reflects the floor's independent features and is an objective and effective indicator.

Experimental study on morphology of betula crib soot particles sampled at different heights

ZHANG Yi, GUO Chenning

2017, 27(9): 57-62. doi:10.16265/j.cnki.issn1003-3033.2017.09.010

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To understand the soot formation of typical fuels at different heights from burn surface, experiments were carried out, the size and morphology of soot aggregates produced from burning of a betula crib were studied by both extractive sampling and subsequent image analysis. The morphology of soot was observed by scanning electron microscope(SEM). The morphology of soot aggregates and the diameter distribution of primary particles were analyzed for the soot sampled at different heights. The results show that when sampling heights are not greater than 0.8 m, irregular sheet structures and flake-like masses are observed from the burning of the crib, that burning of the crib can produce tar, which adheres on the surface of the sampling grid, that the size and thickness of the coating layer decreases with increasing height, that the amount of small particles in the fragments increases with increasing height, and that the average diameter of the primary particles is 44-47 nm when sampling is made at different heights above the fire source.

Research on coal's combustion characteristics and kinetics parameters as a function of its metamorphic degree

BAI Gang, ZHOU Xihua, SONG Dongping, LI Xueming

2017, 27(9): 63-68. doi:10.16265/j.cnki.issn1003-3033.2017.09.011

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For the sake of studying the influence of coal metamorphic grade on the heat release characteristics of coal combustion in coal mine fires, thermogravimetric experiments were carried out on 6 coal samples different from each other in metamorphic degree by using an STA 449C type synchronous thermal analyzer. DTG curves were obtained by differential calculation of TG curves. Kinetic parameters of combustion reaction were calculated for the 6 coal samples by using Freeman-Carrol model. The results show that the weight loss rate and the maximum weight loss rate decrease gradually with the increase of the metamorphic degree of coal samples,the DTG curves accord with Gauss distribution approximately, that the higher the coal sample moisture content is, the higher the initial exothermal temperature θ_f0 will be, that with the increase of metamorphic degree of coal sample, characteristic temperatures θ₁, θ₃, θ_s1 and θ₄ increase linearly and θ_s0 and θ_f0 decrease linearly that the amount of heat released is an exponential function the degree of coalification, that at the same temperature, there is a negative correlation between the heat quantity and the metamorphic degree, and that there is a positive correlation between the degree of coalification, and the five items, composite combustion characteristic index S, the heat quantity, the filtration activation energy, the ignition activation energy and combustion activation energy.

Experimental research on blasting vibration damage accumulation mechanism of fresh concrete

CHU Huaibao, WU Libao, YANG Xiaolin, YE Hongyu, LI Shuanjie, ZHAO Yu

2017, 27(9): 69-73. doi:10.16265/j.cnki.issn1003-3033.2017.09.012

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In order to reveal the blasting vibration damage accumulation mechanism of fresh concrete, the authors designed and carried out blasting vibration damage accumulation simulation experiments, tested the ultrasonic wave velocity and calculated the damage value. The experimental results show that the ultrasonic wave velocity change experiences four stages under repeated frequently blasting vibration load, they are a rapid growth stage, a slow growth stage, a damage degradation lower stage and a stable stage, that the ratio of reducing ultrasonic wave velocity decrease rapidly in the first stage, blasting vibration promotes the development of fresh concrete strength, but the ratio of reducing ultrasonic wave velocity begins to increase sustainably from the second stage, and the damage deterioration effect appears, the blasting vibration damage increases rapidly first, then increases slowly and tends to be stable with the increase of the vibration times, that both the peak wave velocity and steady ultrasonic wave velocity are lower than that those in the datum concrete, and the damage degradation of high strength concrete is more obvious than that of the ordinary concrete, and that the blasting vibration damage accumulation of fresh concrete is the results of native micro crack tip local damage deformation and the micro cracks and mesoscopic crack propagation.

Research on model for elevator failure rate prediction and its application

ZHU Ming, WANG Zhirong, GUO Wenjie, TONG Xuan

2017, 27(9): 74-78. doi:10.16265/j.cnki.issn1003-3033.2017.09.013

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In order to improve the safety management level of elevator field, reduce the failure rate of elevator and ensure the safety of elevator operation, a GM (1,N) prediction model of elevator failure rate affected by temperature and humidity was built. Influences of environmental temperature and humidity on the failure rate of elevator was studied. The prediction model was verified and the residual sequence was obtained. A residual correction model was built based on the residual sequence to modify the prediction model. The failure rate of a certain brand of elevator was predicted by the modified model. The results show that prediction by using the modified model conforms with the reality closely, that the effect of humidity on the failure rate is more significant than that of temperate, that the brand of elevator fault rate has a rising trend, and the inspection, maintenance and management of the brand elevator should be strengthen.

Survey on research on dynamic damage detection methods for in-service offshore platform

LENG Jiancheng, TIAN Hongxu, ZHOU Guoqiang, WU Zemin

2017, 27(9): 79-85. doi:10.16265/j.cnki.issn1003-3033.2017.09.014

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For the sake of ensuring safety in marine oil production and ascertaining the future trend in research on dynamic damage detection methods for in-service offshore platforms, the research status and progress, advantage and disadvantage and the limitations in application of dynamic damage detection methods for in-service offshore platform were summarized and analyzed from the aspects of both modal parameter identification and dynamic damage detection. The results show that the prevalent research area includes non-stationary modal identification methods under ambient excitation,and combination of different damage diagnosis methods and intelligent algorithms, that the incompleteness of measured modal information is the main difficulty of application, and that building connection with safety evaluation and residual life predication is development goal of dynamic damage detection method for in-service offshore platform.

Research on safety slope of mountain third-level highway in mountainous area based on heart rate index

ZHANG Juan, ZHU Wenqiang, LIU Haoxue, ZHU Wenbang

2017, 27(9): 86-91. doi:10.16265/j.cnki.issn1003-3033.2017.09.015

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For the sake of studying drivers' heart rate as a function of both longitudinal slope of highway in mountainous area and the velocity of vehicle, field experiments were carried out with 26 drivers selected randomly. In the experiments, a dynamic tractor was used to collect the data on drivers' heart rate, and GPS was used to collect the data on real-time operational speed. Through partial correlation analysis, the main factors influencing drivers' heart rate were identified, and two models were built, one for the relationship between drivers' heart growth rate and longitudinal slope, and the other for the relationship between the rate and the velocity. The analysis results show that there is a positive correlation between the drivers' heart growth rate and both the slope and the velocity. On the basis of drivers' comfort and safety, it is suggested that the maximum safety longitudinal slope in the uphill direction should not exceed 6.8% for a third-level highway with two lanes in a mountainous area.

Cooperative vehicle control model for dealing with traffic accident at intersections

LUO Xia, HE Biao, GAO Yuan, LIU Shuozhi

2017, 27(9): 92-97. doi:10.16265/j.cnki.issn1003-3033.2017.09.016

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To deal with the traffic congestion caused by traffic accident at the intersection, using connected-vehicle-based V2V communication technology, a cooperative vehicle control model was built based on location, speed and other information reported by connected vehicles. And the model can arrange vehicles' passing orders and moving trajectories on purpose of minimizing total traffic delay. Moreover, vehicles are allowed to utilize the reverse lane to bypass accident cars. An algorithm was worked out for solving the model based on both the decision tree algorithm and the rolling horizon optimization algorithm. Finally, a simulation platform was established to verify the validity of the model. Simulation results show that the model and the algorithm outperforms conventional traffic signal control methods, and can be used to significantly reduce the adverse impact caused by accident vehicles.

Study on technique for human reliability analysis of air traffic controllers

YUAN Leping, ZHANG Xingjian

2017, 27(9): 98-103. doi:10.16265/j.cnki.issn1003-3033.2017.09.017

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For the purpose of effective assessment of human reliability of air traffic controllers, a HRA technique tailored for air traffic controllers operation was developed based on HEART. GTTs were determined by going through the controller's daily tasks. Using the geometric mean method and sampling method, the nominal human error probabilities were calculated by processing the data from multi-sauces. EPCs were structured by following the idea of "4M" (Human-Machine-Media-Management), and EPCs were also referred to existing HRA methods EPC or performance shaping factors(PSF). The maximum impact values of EPCs were obtained by the Delphi method and the BN. The controllers' human error probability(HEP) in the scenario of air traffic de-conflict was analyzed by applying the method proposed in the paper. The result is between that by the traditional HEART and that by the traditional cognitive reliability and error analysis method (CREAM), which demonstrates the validity of the method.

Routing optimizing for hazardous materials road transportation under static single point and multiple-target condition

YANG Lijuan, WANG Jiangfeng, CHEN Mingtao

2017, 27(9): 104-109. doi:10.16265/j.cnki.issn1003-3033.2017.09.018

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To control the influence of hazardous materials road transportation on the ecological environment and residents, models based on multi-objective constraint conditions were built. The paper analyzed the accident rate, population exposure, environmental damage and aggregate consequences of hazardous materials transportation accident. Based on these analyses, a multi-objective optimization algorithm under static single point condition to minimize the length of route, the transportation cost and the transportation risk was designed. GRA is applied to choose a suboptimal path which has the greatest relevance with “the absolute optimal path”. Finally, the models and the algorithm were verified by developing a reasonable transportation path of styene for a certain company in China. Results show that the models and the algorithm are suitable for solving the optimization problem of the transport route of dangerous goods, and can get the optimal path with shorter transportation time, lower cost and less harm to people and environment.

Vulnerability analysis of China's high speed railway network

YU Bao, FENG Chun, ZHU Qian, ZHANG Yi

2017, 27(9): 110-115. doi:10.16265/j.cnki.issn1003-3033.2017.09.019

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In order to improve the invulnerability and reliability of HSRN in the face of emergency and to ensure smooth and efficient operation of HSRN, topological structures of China's HSRN in three periods were built based on complex network theory, network characteristics and evolution rules were studied. Integrated station importance evaluation index combining degree and betweenness was given to discover the important stations. Through the analysis of network efficiency and relative size of the largest connected subgraph, the HSRN's performance was studied under random and malicious attacks. Results show that China's HSRN adds network's connectivity in the mid-term while enriches agglomeration effects in the long-term, that Wuhan, Tianjin, Changsha and Xiangyang are the important stations in different development stages, and that HSRN possesses robustness under random attack and vulnerability under malicious attack.

Performance evaluation of HSE with fuzzy Petri nets based on BP algorithm

HAN Jing, LIANG Wei, ZHANG Laibin

2017, 27(9): 116-121. doi:10.16265/j.cnki.issn1003-3033.2017.09.020

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In order to obtain more objective and effective results of HSE performance evaluation and enhance the management effect, a FPN HSE performance evaluation model based on BP algorithm was built. Firstly, before building the model, a FPN model of HSE performance was built by combining the HSE elements hierarchy. Then the BP error back propagation algorithm was used to adjust the confidence of the transitions and the reliability of the initial places in the FPN reasoning process to avoid the subjectivity of input parameters. The evaluation results can be obtained by inputting the relevant parameters and fuzzy reasoning. Finally the effectiveness of BPFPN model was verified by applying it to a certain petrolic company as an example. The results show that the BPFPN model is suitable for HSE performance evaluation and can provide decision support for HSE management.

Study on influence of injection pressure on replacement effect for different injection gases

YANG Hongmin, LIANG Longhui, FENG Zhaoyang, XU Dongliang

2017, 27(9): 122-128. doi:10.16265/j.cnki.issn1003-3033.2017.09.021

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The gas injection pressure is the key technical parameter in the field of enhanced coalbed methane drainage engineering by gas injection. In order to study the effect of injection pressure on replacement effect for coal seam methane in different source gas injection, a laboratory gas injection simulation test method was adopted under the condition of vertical stress loading on coal particles containing methane, and a series of simulation experiments on replacement and driving methane in anthracite coal was carried out by use of helium, nitrogen and carbon dioxide injection under 1.25 MPa vertical load. Experimental results show that all the source gases are detained in the coal seam during the breakthrough time, and the breakthrough time of CO₂ can be as long as 440 min, that after the breakthrough, the injection source gases run out from exit gradually, and the retention rate decreases gradually, and only shows driving effect ultimately, that the breakthrough time of the injection source gases decreases with the increase of the gas injection pressure, and decreases with the increase of the source gas adsorption, and that the rate of replacement-driving is determined by the replacement action, driving action and its ratio, and it has no obvious relationship with the adsorption of the injection source gas, and the higher the injection pressure, the higher the efficiency.

Analysis of coal and gas outburst process considering effective stress

TANG Jupeng, DING Jiahui, LU Jiangwei, YU Ning

2017, 27(9): 129-133. doi:10.16265/j.cnki.issn1003-3033.2017.09.022

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In order to further study the process of coal and gas outburst, the stress states were analyzed for the original stress region, the stress concentration region and the pressure relief region in front of the uncovering coal face. Effective stress expressions were deduced for the regions. And the effective stress expressions were verified by using the numerical simulation method of PFC^3D, FLAC^3D program. The results show that the calculation results of the effective stress are close to the theoretical results, that there is a cubic polynomial correlation between the effective stress values and distance from uncovering coal face, that the outburst region rapidly expands at first and then steadily increases in the process of coal and gas outburst, that the outburst region is a hole with a small mouth a large cavity, and that the crack propagation process of coal and rock mass are divided into three stages, and the growth rate of number of cracks increases at first and then decreases at each stage.

Research on data-driven model for evaluation of construction safety and its application

BAI Xiaoping, PU Tao

2017, 27(9): 134-139. doi:10.16265/j.cnki.issn1003-3033.2017.09.023

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In view of a significant element of subjectivity in the construction safety evaluation process, in order to scientifically and rationally evaluate the safety performance of construction the authors established an index system of construction safety based on the method of literature review, field investigation and expert interview. Then, they used the GA and the factor analysis method to optimize the evaluation indexes and establish a data-driven construction safety evaluation model. Furthermore, they proposed a BN-based quantitative evaluation process of this model. Finally, the model was applied to the safety evaluation of a construction project. The results showed that the data-driven construction safety evaluation model can be used to obtain the probabilities of the project at different safety levels and identify the weak links of the construction safety management so that to improve the level of the construction safety management.

Study on mechanism of deep-hole controlled blasting in coal seam

ZHANG Shuchuan, ZHU Feihao, GAO Kui

2017, 27(9): 140-145. doi:10.16265/j.cnki.issn1003-3033.2017.09.024

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In order to prevent and control coal gas outburst and other gas disaster accidents by using the deep-hole controlled blasting technology, the mechanism of the deep-hole controlled blasting technology was studied by means of numerical analyses, laboratory tests and theoretical analyses. Both blasting with control hole and blasting without control hole were simulated numerically by using 3D numerical analysis software ANSYS/LS-DYNA and physically. Incidence and reflection of stress wave at control hole were analyzed theoretically. The results show that the control hole reflects the incident compressive stress wave into a tensile stress wave and produces a tensile action, the control effect is obvious and the inhibition effect on the fracture development in other directions is obvious.

Empirical study on evaluation index system of flight safety skill

CHEN Fang, SUN Yateng, FAN Danhong, LONG Liangqin

2017, 27(9): 146-151. doi:10.16265/j.cnki.issn1003-3033.2017.09.025

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To contribute to drafting pilot skill training programs more scientifically and rationally, 30 key factors influencing flight safety skill were identified by visiting experts after analyzing connotation of the skill and considering the results obtained by the predecessors. On the basis of a survey by questionaires, an evaluation index system of flight safety skill was established as a result of an exploratory factor analysis. The system includes 7 primary indices such as pre-flight preparation, flight procedures and skills, flight monitoring and other indices. It also includes 30 secondary indices such as data or documentation preparation, off board inspection, in board inspection and other indices. A confirmatory factor analysis was made for the system. The analysis demonstrates that the effect of crew resource management on flight skill based on safety is stronger than that of any of other factors including the flight monitoring, flight operations or stability, flight procedures and skills, information and decision making, special case handling and the pre-flight preparation, and that the pre-flight preparation had the weakest effect on the skill.

Miners' unsafe behavior cost and benefit factors recognition and analysis:based on grounded theory

LI Yan, YU Jinhui

2017, 27(9): 152-157. doi:10.16265/j.cnki.issn1003-3033.2017.09.026

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The aim of this study was to explore the composition of cost of miners'unsafe behavior and that of benefit of it. 30 employees, including managerial personnel and industrial workers, of a coal enterprise in Shaanxi province were interviewed by means of field interview method based on the grounded theory. The data obtained from the interviews were coded. Then a conceptual model was built for identification of factors composing the cost and the benefit of the miners' unsafe behavior. The results show that safety consciousness, demographic factors, and situational factors have an important influence on the cost and the benefit, and that the cost includes the risk cost, the preparatory cost and the implementation cost , and the benefit includes the spiritual benefit and the material gain.

Prediction of risks in flight operations based on rough sets and support vector machine

WANG Yantao, TANG Jianxun, ZHAO Yifei

2017, 27(9): 158-163. doi:10.16265/j.cnki.issn1003-3033.2017.09.027

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In order to improve the accuracy of prediction of risks in flight operations, Shandong airlines flight control workflow was analyzed first, and fifteen risk items were taken initially as flight operation risk assessment indicators according to the Civil Aviation Authority Advisory Circular "Air Carrier Operation Control Risk Management System Implementation Guide". Then, on the basis of the data on 100 historical flights of Shandong airlines, the number of risk items was reduced to eight by using the rough set theory, the genetic algorithm and the Johnson's algorithm. Finally, a risk prediction model was built by means of the SVM algorithm. A simulation was carried out with Matlab. The results show that the overall correct rate of sample classification can reach 82.22% for high, medium, low-three types of risk level, and that the method can be used to realize the assessment and classification of risks in flight operations.

Comprehensive evaluation of high-speed railway station operation safety based on IEM-Vague sets theory

ZHANG Bohao, GAI Yuxian, LU Youpeng

2017, 27(9): 164-169. doi:10.16265/j.cnki.issn1003-3033.2017.09.028

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The paper was aimed at reflecting the safety management status objectively in a high-speed railway station. A safety evaluation system of high-speed railway station, including 4 criterion layers and corresponding 18 specific indicators, was established on the basis of referring to railway laws, regulations and experts' research results. The weights of indexes were determined by using the IEM. An improved fuzzy comprehensive evaluation model of high-speed railway station was built by taking advantage of Vague sets theory. A corresponding empirical analysis of the operation safety of a high-speed railway station in northwest China was made so as to verify the model. The results of calculation example indicate that both the station equipment level and personnel ability level have great influence on the operation safety of high-speed railway station, and that the model can reflect the objective situation of high-speed railway station accurately and effectively.

Research on siting of urban emergency resources depots and layout optimization considering rainstorm disaster and distribution route

WU Ke, SONG Yinghua, LYU Wei

2017, 27(9): 170-174. doi:10.16265/j.cnki.issn1003-3033.2017.09.029

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In view of problems of urban emergency resource distribution, such as slow speeds and traffic organizational obstruction, this paper takes rainstorm disaster as background, and works out a methodology of siting of urban emergency resources depots and layout optimization. The methodology is worked out on the basis of Hongshan District of Wuhan as an example and involves establishment of an evaluation index system, siting of alternative emergency resources depots, calculating total length of distribution routes for the depots by using the Floyd-Warshall algorithm, and studying the relationship between the number of depots and the total length. The results show that increasing number of depots can reduce the total length of the distribution path and improve the distribution efficiency, however, when the number of depots in this area is more than five, it has no apparent effect on the length, so, five is the optimal number of depots in the study area.

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