China Safety Science Journal

Building an effective mechanism for introspection of major accidents

ZHANG Supei, ZHUANG Yue

2017, 27(6): 1-6. doi:10.16265/j.cnki.issn1003-3033.2017.06.001

Asbtract ( 189 )

PDF (1601KB) ( 487 )

References | Related Articles | Metrics

To overcome deficiency in investigation into deep cause of events, in effect of reflection, and in distribution of rights and responsibilities for multiple agents, four typical major disasters at home and abroad were selected to analyze the related introspection processes, and describe the related paths of introspection of major regulations on the basis of revisions to the related regulations on work safety and the data on major events in 2004-2015. The analysis shows that at present introspection cycle is short, introspection power is weak, and introspection effect is deficient, the existing main body structure of introspection is rigid , and the four corners structure Europe and UAS adopt is more flexible. An overall framework was proposed for the introspection. With the framwork, an effective introspection mechanism can be provided.

Research on relationship among various kinds of unsafe construction behavior based on social network analysis

LI Shuquan, FENG Yaqing, HU Songhe, FENG Lingxiang

2017, 27(6): 7-12. doi:10.16265/j.cnki.issn1003-3033.2017.06.002

Asbtract ( 206 )

PDF (1485KB) ( 365 )

References | Related Articles | Metrics

Based on the importance of unsafe construction behavior, the set of unsafe behavior was determined and a conceptual model was built for relationship among unsafe construction behavior through literature analysis and expert interview to enhance the management of construction safety. Based on14 pieces of investigation data, a network model of relationship among unsafe construction behavior was built by applying SNA and its structural feature, node attribute, influence and hierarchical clustering were investigated. The results show that key nodes of unsafe behavior can make up behavior reaction chains, and bridge nodes can be linked to form an unsafe behavior network which has a high risk, that the key kinds of key unsafe behavior are the irrational setup of work safety management institution and the improper design of safety inspection supervision system, that behavior reaction chains exist, including the irrational setup of production safety management institution led to errors in supervision and direction on condition, and that some kinds of behavior such as the irrational setup of production safety management institution can serve as a bridge node.

On characteristics of attention quality of controller based on k-means clustering

LI Jingqiang, WANG Bei, ZHAO Ning, LI Hao, WANG Yong

2017, 27(6): 13-18. doi:10.16265/j.cnki.issn1003-3033.2017.06.003

Asbtract ( 200 )

PDF (1932KB) ( 406 )

References | Related Articles | Metrics

To reveal the type and characteristics of attention quality of controllers, a 20 min continuous cancellation test was designed and carried out. The test data were analyzed by using the clustering analysis method. The error rate of reaction, the mean value of reaction times, and the variance of reaction times were chosen as the measurement parameters of attention span, attention stability, attention switching and distribution. The types of attention quality of controllers were classified by using the k-means clustering analysis method. The characteristics of attention quality of controllers were described and the differences between controllers and controller students were revealed according to the types of attention quality. The results show that 181 testees (controllers and controller students) could be classified into four types according to attention quality, that these outstanding controllers show large attention span, strong attention stability, rational attention switching and improper attention distribution, and that there is a significant difference between controllers and controller students in attention quality.

Analysis of driving behavior characteristics of drivers in Near-crash events

LYU Nengchao, REN Zeyuan, DUAN Zhicheng, LUO Yi

2017, 27(6): 19-24. doi:10.16265/j.cnki.issn1003-3033.2017.06.004

Asbtract ( 216 )

PDF (2282KB) ( 499 )

References | Related Articles | Metrics

In order to study the driving behavior of drivers in rear-end accidents, field experiments were carried out in a certain section of urban expressway, in which near-crash events were observed. First of all, the maximum deceleration, braking to maximum deceleration time, average deceleration, and TTCi were measured for the 21 drivers. Then Mobileye and other equipment were used to extract data, on effects of factors, such as gender, driving experience and driving style, on driving behavior of drivers. Variance analyses were carried out for the data. The results show that average deceleration and the maximum deceleration of the female drivers in Near-crash events are greater than those of the male drivers, female drivers are more likely to slam on the brakes, that the experience affects the driver's average deceleration, the maximum deceleration, that the skilled driver's brake to the maximum deceleration time is longer, and the braking process is more stable, and that the driver time headway(THW) of drivers having a ratical style of driving is smaller than that of the conservative drivers.

Study on older drivers' car following behavior and influencing factors

JIAN Meiying, SHI Jing

2017, 27(6): 25-30. doi:10.16265/j.cnki.issn1003-3033.2017.06.005

Asbtract ( 187 )

PDF (1468KB) ( 478 )

References | Related Articles | Metrics

In order to improve the safety of road traffic under the aging background, based on a driving simulator, the car following behavior of older drivers and the influencing factors were investigated. Headway, speed and response time were selected as the indexes of car following behavior. Difference in the car following behavior between older and younger drivers was analyzed, and then Pearson correlation coefficient method was used to analyze the relationships among the car following behavior, drivers' age, work load and drivers' preference. The results show that compared with younger drivers, older drivers' time to responding to the emergency brake is longer, and they always adopt the larger headway and are more variable in their speed, and that the car following behavior is significantly related to drivers' age, work load and drivers' preference.

Research on visual characteristics of drivers driving through extremely long expressway tunnel

HU Yueqi, LIU Haoxue, ZHU Tong, XU Yu

2017, 27(6): 31-36. doi:10.16265/j.cnki.issn1003-3033.2017.06.006

Asbtract ( 335 )

PDF (1498KB) ( 483 )

References | Related Articles | Metrics

For the sake of examining the visual characteristics of drivers having different amounts of experience in driving and driving through an extremely long freeway tunnel, real-vehicle tests were conducted, in which 29 drivers' visual feature parameters were recorded real-time by using an eye tracker. Visual feature indexes were obtained, including fixation duration, fixation point location, saccadic duration, saccadic frequency and saccadic amplitude. Variance in eye movement behavior was analyzed by using statistical methods, and influences of driving experience and environment on driving safety were investigated. The results demonstrate that in comparison with driving on a section of an open road, mean fixation duration is longer and range of horizontal fixation point positions is wider in the fairly long tunnel while range of vertical fixation point positions is narrower, saccadic frequency is higher and saccadic amplitude is smaller, and that compared with inexperienced drivers, experienced drivers have shorter fixation duration and wider range of fixation point positions, while their saccadic frequency is lower and saccadic duration is shorter.

Discipline construction of safety operations research

WU Chao, HUANG Linfei

2017, 27(6): 37-42. doi:10.16265/j.cnki.issn1003-3033.2017.06.007

Asbtract ( 176 )

PDF (1472KB) ( 357 )

References | Related Articles | Metrics

In order to promote the application of operations research in the field of safety science, and perfect the safety science discipline system, based on literature of safety science, operations research and system science, a definition was put forward for the safety operations research and its connotations were analyzed. Based on this, the disciplinary foundation of safety operations research was discussed. The major subjects of safety operations research from the theories, academic discipline and applications were built. Based on this, its discipline foundation framework was provided, and its application prospects was analyzed. The results show that the operations research is an interdiscipline subject which keeps solving safety problems in mind, takes the operational research theory as the basic connotation, and solves the safety operations problems by using optimization methods,and that the research has rich contents and wide application prospects.

SD simulation analysis of factors influencing safety levels in oil-gas storage tank area

ZHAO Junru, BAI Wei, CHEN Jing, DAI Guang

2017, 27(6): 43-48. doi:10.16265/j.cnki.issn1003-3033.2017.06.008

Asbtract ( 186 )

PDF (1811KB) ( 323 )

References | Related Articles | Metrics

To analyze factors influencing safety level in a given oil-gas tank area, and study the relationship between safety level and safety input in this area, an influence factor SD model was built based on the theory and method of SD. At first, a causal cycle diagram was established from three macro dimensions of human safety behavior, safety management and device. Then, a stock flow diagram was constructed on the basis of considering the micro factors. Effects of the factors on the safety level were simulated qualitatively and quantitatively from both the macro and micro perspectives. The result indicates that the improvement of safety level in oil-gas tank area needs long term and continuous safety input, that in terms of contribution to the safety level,there is a descending order of safety behavior level, safety management level and device safety level,and that in micro factors, the safety education training has maximum influence on the safety level.

Dynamic relationship between multi coupling risk factors of hazardous chemical storage and transportation fire and explosion accidents

CHEN Weike, ZHANG Xin

2017, 27(6): 49-54. doi:10.16265/j.cnki.issn1003-3033.2017.06.009

Asbtract ( 270 )

PDF (1945KB) ( 586 )

References | Related Articles | Metrics

There are many factors leading to hazardous chemical storage and transportation fire and explosion accidents,revealing the relationship between each other is the key link to cut off the accident chain and implement targeted intervention.Hierarchical relationships between the risk factors were established by ISM. A vector analysis of the risk factors was carried out based on the coupling theory to derive a causal map for hazardous chemical storage and transportation fire and explosion accidents. According to the theory of system dynamics, a dynamic model was built for hazardous chemical storage and transportation fire and explosion accidents multi risk factors coupling. The model not only reflects the coupling relationships between the risk factors, but also describes the cumulative process of the unsafe coupling amount of each variable, which lays a foundation for research on the mechanism, by which a given risk factor influences a hazardous chemical storage and transportation fire explosion accident.

Critical PSF analysis for high-speed railway dispatchers based on improved PEM

WU Haitao, LUO Xia

2017, 27(6): 55-60. doi:10.16265/j.cnki.issn1003-3033.2017.06.010

Asbtract ( 204 )

PDF (1542KB) ( 356 )

References | Related Articles | Metrics

In order to analyze the factors affecting the human reliability of high-speed railway dispatchers in-depth, the PSF for high-speed railway dispatchers were extracted based on literature review, task analysis and structured interview. The PSF weights were calculated by using analytic network process (ANP) method. According to the PSF, a questionnaire was designed and the PSF implementation degrees were achieved by the survey results. Then the critical PSF were extracted by using the improved PEM method. The results show that complex event cognitive level, workload, operation skills are the top three factors of importance degree,that labor organization and scheduling, workload, safety information reporting and feedback are the last three factors of implementation degree,and that workload complex event cognitive level, safety information reporting and feedback are the critical factors.

Prediction of coal spontaneous combustion in caving zone with unbalanced data

SHAO Liangshan, LI Xiangchen

2017, 27(6): 61-66. doi:10.16265/j.cnki.issn1003-3033.2017.06.011

Asbtract ( 163 )

PDF (1535KB) ( 379 )

References | Related Articles | Metrics

In order to improve the prediction accuracy of spontaneous combustion of a few samples under the unbalanced data, a prediction model based on K-means-Relief-HSMOTE-SVM was built. First, the K-means method was used to optimize the traditional Relief method for index selection, to make up its deficiency-combustion indexes' unreasonablly high weights caused by the feature extraction under unbalanced data. Then, in view of problems such as overfitting encountered in dealing with unbalanced data with the SMOTE method an h dimensional spherical space thought was introduced, and the clustering algorithm was used to determine the center and establish the spherical space, and an improved HSMOTE algorithm was developed for balancing the spontaneous combustion data. Next, the SVM was used to predict the spontaneous combustion data. Actual samples from Xuandong No.2 coal mine were used to conduct 50 experiments, and a result comparison was made between the model built by the authors, the traditional SVM and other models. The results indicate that K-means-Relief-HSMOTE-SVM can effectively extract feature factors and overcome SMOTE defect,that compared with other models, K-means-Relief-HSMOTE-SVM can more effectively improve the traditional SVM in unbalanced prediction accuracy and geometric mean correct rate for combustion samples of the minority class natural data.

A study on predicting model for self-heating behavior of coal based on adiabatic oxidation experiment

WANG Xinyang, LUO Yi, ZHANG Xun, HAO Chaoyu

2017, 27(6): 67-72. doi:10.16265/j.cnki.issn1003-3033.2017.06.012

Asbtract ( 154 )

PDF (1646KB) ( 320 )

References | Related Articles | Metrics

In order to improve the testing results more reliable and complete and make them applicable for engineering practice, lignite and bituminous coal samples were studied experimentally and theoretically. The adiabatic oxidation method was applied to test the spontaneous combustion behaviors of these two samples. Based on results of the tests, a mathematical model for predicting spontaneous combustion characteristics of coal was developed to study self-heating rate and oxidation process of the lignite and bituminous coal. The effectiveness of the model was checked by the testing data. Trend of the self-heating curve from the experiment agrees with that of the self-heating traces determined by the model. Then the calibrated model was further used to predict the self-heating behaviors of other coals with different coal quality parameters and dynamic parameters. The testing and predicting results indicate that the thermal-runaway time determined by the tests and the model for lignite is 5.6 and 5.1 h and for bituminous coal is 43.8 and 42.2 h. This model is capable of facilitating the test to generate a complete self-heating curve and predicting the thermal-runaway time of spontaneous combustion of coal.

Study on thermal radiation of horizontally oriented rectangular source fuel jet fire

ZHANG Yuanyuan, HUANG Youbo , LYU Shuran

2017, 27(6): 73-78. doi:10.16265/j.cnki.issn1003-3033.2017.06.013

Asbtract ( 180 )

PDF (1549KB) ( 417 )

References | Related Articles | Metrics

In order to study the thermal radiation and hazard radius of horizontally oriented rectangular source fuel jet fires, Thornton model combined with FDS simulation tool was used to simulate square and rectangular fuel source (with same area) jet fires. Simulation involving 13 fuel exit velocities were carried out. The Thornton model was modified to take aspect ratio of rectangular orifice into account based on simulated data. The results show that the thermal radiation results obtained by Thornton model are greater than those of FDS, but their variation tendencies with exit velocity are the same. The modified Thornton model can be used to predict thermal radiation near the exit port of rectangular jet fire,that there is an exponential relationship between hazard radius and the exit velocity,and the Thornton model prediction of the hazard radius matches the simulation results.

Dynamic analysis and optimization of coal spontaneous combustion inhibitors

LI Xiaoxi, TAN Bo

2017, 27(6): 79-84. doi:10.16265/j.cnki.issn1003-3033.2017.06.014

Asbtract ( 183 )

PDF (1438KB) ( 360 )

References | Related Articles | Metrics

Four groups of TGA experiments (on raw coal,coal with ammonium bicarbonate,coal with ammonium polyphosphate,coal with PA respectively) were designed and carried out to study inhibiting properties of three inhibitors. Dynamic analysis method was used to examine effects of the inhibitors on activation energies for the samples in three combustion stages. The results show that three kinds of inhibitors have no effects on the normal combustion of coking coal and possess good inhibiting results,that activation energies of oxidation stage are increased to 78.92 kJ/mol in raw coal group, 81.63 kJ/mol in ammonium bicarbonate group, 94.22 kJ/mol in ammonium polyphosphate group and 80.55 kJ/mol in PA group,that ammonium polyphosphate possesses the best inhibiting effect (the activation energy of the sample increases most significantly),that PA can promote coal's complete combustion and efficient utilization (the sample has the lowest activation energy in combustion weight loss stage),and that both ammonium polyphosphate and PA can inhibit coal spontaneous combustion efficiently, they can be used as the optimal inhibitors in actual production.

Stochastic analysis of dynamic response of concrete gravity dam using statistical model of blast load

WANG Chao, YAN Weishuo, HAN Junge

2017, 27(6): 85-90. doi:10.16265/j.cnki.issn1003-3033.2017.06.015

Asbtract ( 184 )

PDF (1975KB) ( 344 )

References | Related Articles | Metrics

A stochastic analysis method was worked out for structural response to predict the dynamic response value, to determine the reasonable safety distance based on a statistical model. Firstly, a statistical load model was built based on the existing blast load prediction formula, data charts and related tests. Then, an explosive-air-dam -foundation finite element model was also built for a non-overflow section of a certain concrete gravity dam in China and the uncertain dynamic response of the structure of the dam was analyzed. Finally, the statistical distribution of the dynamic response values and the percentage damage,as functions of the scaled distance,were studied. The results indicate that peak responses of the dam roughly obey normal distribution, so the uncertainty of explosion load should be considered in analyzing the damage of the structure under the explosive impact.

Assessment of risk of gas explosion in coal mine based on prospect theory and interval number

PI Zikun, JIA Baoshan, JIA Tinggui, LI Zongxiang

2017, 27(6): 91-96. doi:10.16265/j.cnki.issn1003-3033.2017.06.016

Asbtract ( 290 )

PDF (1424KB) ( 509 )

References | Related Articles | Metrics

In order to evaluate disaster risk of gas explosion in coal mine, a risk evaluation model was built on the basis of both the prospect theory and the fuzzy evaluation theory. And an evaluation system was also established based on the formation conditions of coal mine gas explosion and accident-causing theory. Having the aid of the prospect theory, the attribute values were determined as the weights of each interval number, by using the expectancy value of interval number as the reference point. A fuzzy comprehensive evaluation model was built for the risk of gas explosion in coal mine based on the interval numbers on the basis of both the fuzzy comprehensive evaluation theory and the ranking interval numbers principle. Finally, risk evaluations were performed for three coal mines by applying the model. The assessment result conforms with the real situation. The results show that the proposed evaluation method overcome the limited rational behavior of man's influence on the decisions of subjective expected utility, the evaluation results was more objective and scientific.

Research on liquid carbon dioxide fire extinguishing equipment for use in mine

GE Liang, SHAO Yimin, JIANG Dexian, ZHANG Guangxun, LIU Lin, TANG Yanchang

2017, 27(6): 97-102. doi:10.16265/j.cnki.issn1003-3033.2017.06.017

Asbtract ( 172 )

PDF (2065KB) ( 756 )

References | Related Articles | Metrics

In order to avoid fire accidents in underground coal mine effectively, a piece of the mobile fire extinguishing equipment of liquid carbon dioxide for use in disaster areas was developed. An insulated storage tank embed in the equipment can reduce the influence of environment temperature on the low gas temperature condition. A self-pressure control system in the equipment can fill the equipment with the gas automatically or manually according to the under-pressure level during the drainage process. The characteristics of effective storage and large flow delivery of carbon dioxide, physical state transition in and out the pipeline, and the performance of covering and extinguishing the fire source were studied experimentally. The results show that for a vacuum degree of storage tank of 1.6 Pa, the effective volume of the liquid inside the 2 m³ tank is not less than 1.6 m³ after 48 days and the time of liquid discharge for a single tank is about 10.5 min, and that continuous gasification jet without ice blocking after a 100 m liquid horizontal delivery can be realized by using the nitrogen self-compensating pressurization technology.

Research on pipeline dent assessment based on ductile failure damage model

HUANG Chao, JIA Yueru, ZHOU Fangzhou, CHEN Fulin

2017, 27(6): 103-108. doi:10.16265/j.cnki.issn1003-3033.2017.06.018

Asbtract ( 171 )

PDF (1532KB) ( 419 )

References | Related Articles | Metrics

To improve the accuracy of the method to assess pipeline dents, permission strain needs more adequate theoretical basis to formulate. Based on the ductile fracture model and damage mechanics, a damage assessment model was built for pipeline dents. With the help of the finite element method, the damage degrees of two typical dents (smooth dents and kinked dents) in different regions were studied. Critical failure strains are calculated for different pipe specifications and also under different internal pressures. Numerical simulation study shows that for different dent types, damage degrees are varying from regions to regions, and cracks are generated not always in the same way, that for different pipe specifications, critical failure strains are almost the same, that due to the effect of springback, critical failure strains vary under different internal pressures,that a fitting relationship of critical failure strains under different pressures is obtained, and that when assessing the dent by using the strain method, the type of the dent should be determined before selecting the corresponding strain standards.

Evaluation of external corrosion of urban buried gas pipeline based on RS-SVM

LUO Zhengshan, WANG Hao, BI Aorui

2017, 27(6): 109-114. doi:10.16265/j.cnki.issn1003-3033.2017.06.019

Asbtract ( 172 )

PDF (1301KB) ( 375 )

References | Related Articles | Metrics

To improve the accuracy of the evaluation of the city buried gas pipeline external corrosion, the main factors affecting pipeline corrosion were identified, an evaluation index set was constructed, combined with the advantages of SVM and RS, a model was built for prediction of external corrosion of city buried gas pipeline. Specific steps were given as follows: sample data collection, sample data preprocessing, attribute reduction algorithm to filtering core index set, and SVM training data and verifying model. A certain city gas pipeline was taken as an example to verify the model. The results show that the results of predicting the corrosion of pipeline level by using RS-SVM model are consistent with the actual results, the traditional multivariant regression method for prediction of pipeline corrosion rate has a 14.1% average relative error, while RS-SVM prediction model of pipeline corrosion rate has a 7.9% average relative error, the accuracy of RS-SVM model is higher than that of the traditional method.

Safety performance assessment of fabricated building project based on cloud model

LI Yingpan, LIU Mingqiang, WANG Fang, LI Ruige

2017, 27(6): 115-120. doi:10.16265/j.cnki.issn1003-3033.2017.06.020

Asbtract ( 261 )

PDF (1831KB) ( 445 )

References | Related Articles | Metrics

To get a scientific and objective assessment of the grade of the safety performance of a given fabricated building project, after considering the fuzziness and randomness of the project safety performance assessment, a method based on cloud model was built on the basis of the expert scoring method. A safety performance assessment index system was established according to 4M1E. The AHP and the entropy weights method were used to calculate combining weights. Method were worked out for calculating standard cloud and comprehensive evaluation cloud. The grade of project safety performance is determined by cloud similarity. The method was applied to a certain pilot project in a certain city in China as an example. The calculation results are closer to the reality and show that the project safety performance grade is excellent, which conforms with the results obtained by conventional methods.

Research on prediction of rock burst based on optimized Bagging-LSSVM model

WEN Tingxin, CHEN Xiaoyu, YANG Hongyu, DOU Rong, TIAN Yuchen

2017, 27(6): 121-126. doi:10.16265/j.cnki.issn1003-3033.2017.06.021

Asbtract ( 172 )

PDF (1615KB) ( 437 )

References | Related Articles | Metrics

To predict rock burst risk classification accurately, an optimized Bagging-LSSVM prediction model was built. On the basis of designing and optimizing the algorithm flow of Bagging-LSSVM, a set of classical classification datasets was introduced to the experiment. A minimum number was obtained experimentally for basic classification model's number in meetting optimal classification. Main factors affecting rock burst were identified to futher determine the evaluation indexes. Then 35 groups of measured data provided by the Chongqing Yanshitai mine were used, as samples to test. Correlations among original sample indexes were eliminated by using KPCA. Then the rock burst prediction accuracy comparison was made among the optimized Bagging-LSSVM model, optimized Bagging-SVM model and LSSVM model. It is turned out that forecasting accuracy by the optimized Bagging-LSSVM model is greater than those by others.

Physical simulation of roof fractured zone roadway instability in ascending de-stressed mining

WANG Cheng, DING Ziwen, CHEN Xiaoxiang

2017, 27(6): 127-132. doi:10.16265/j.cnki.issn1003-3033.2017.06.022

Asbtract ( 131 )

PDF (3091KB) ( 480 )

References | Related Articles | Metrics

In order to solve the problem of large deformation of roof fractured zone roadway maintenance in ascending de-stressed mining, overlying strata movement characteristics and fracture failure process were researched by using the method of physical simulation.Meanwhile roadway surrounding rock stress and failure characteristics under the condition of boltsupport were analyzed.The results show that roof fractured zone roadway falls down coordinating with the overlying strata,that at the stage of workface mining, strength of surrounding rock of roof fractured zone roadway drops sharply accompanied by the severe roadway convergency, because of interactions between fracture field and superimposed stress field of mining and roadway extraction,that when the interaction becomes steady after workface mining, surrounding rock stress declines,and that the bolting combined with U-steel or grouting can be implemented to support the roadway.

Evolution of crack field and formation mechanism of advantage gas channels in superposition mining

MA Haifeng, WANG Wenlong, LI Chuanming, SHI Wenbao, YUAN Anying, LIU Wanrong

2017, 27(6): 133-138. doi:10.16265/j.cnki.issn1003-3033.2017.06.023

Asbtract ( 172 )

PDF (3683KB) ( 405 )

References | Related Articles | Metrics

To understand the evolution and formation of gas (methane) channels in overlying strata during mining close distance seam group, formation mechanism of crack fields in overlying strata was studied by using the method of similar simulation. The results show that mining crack field spreads non-uniformly with the face advancing, it expands faster during the weighting than normal, that the mining crack field has the relationship of synchronous coordination with the face advancing and can be divided into fractured development zone, fracture penetration zone and compacted area, and the evolution of mining crack field is exacerbate during the superposition mining in close distance seam group, the crisscrossed gas flow channels are formed and can be divided into advantage gas channel zone, transition zone of advantage gas channel and general gas channel zone, and the flow capacity of gas reduces in turn.

Research on model for permeability of coal under stress and temperature coupling condition

LI Bobo, YANG Kang, XU Peng, XU Jiang, ZHANG Min

2017, 27(6): 139-144. doi:10.16265/j.cnki.issn1003-3033.2017.06.024

Asbtract ( 215 )

PDF (1410KB) ( 402 )

References | Related Articles | Metrics

In order to study the variation trend in seepage of coal with increasing depth of mining,seepage experiments were carried out by using a piece of triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing methane.A permeability model considering slippage effect under the stress and temperature coupling condition was built. The model was verified by experimental data.That there is a negative correlation between the volumetric strain and the radial strain, and the axial strain show the opposite trend of decreasing and increasing with the increase of temperature,that the permeability first decreases and then tends to be gentle with the increase of pore pressure, and it shows an increasing trend with the increase of temperature. The permeability calculated by the permeability model of coal under the coupling condition between stress and thermal conforms with the experimental results,and that under the low porosity pressure, the slippage effect is more obvious, and it is weakened with the increase of pore pressure.

Application of intuitionistic fuzzy set TOPSIS to evaluation of seismic stability of slopes

WU Shuliang, HUO Liang, YAN Rongfu

2017, 27(6): 145-150. doi:10.16265/j.cnki.issn1003-3033.2017.06.025

Asbtract ( 201 )

PDF (1485KB) ( 369 )

References | Related Articles | Metrics

In order to evaluate seismic stability of rock and soil slopes correctly, based on the intuitionistic fuzzy set TOPSIS, an evaluation model for seismic stability of slopes was built. By comprehensive consideration of qualitative and quantitative indicators, six indexes were identified, including the characteristics of the geotechnical body, the characteristics of the neotectonics, slope height, slope angle, the annual average precipitation, and site seismic intensity. For the fuzziness of qualitative indicators and index weights, intuitionistic fuzzy sets were used to represent them. A seismic stability evaluation model of slope was built based on TOPSIS. The model was used to evaluate the seismic stability of 16 slopes. The evaluation results conform with the actual situation. The results show that the evaluation model of seismic stability of rock slope based on intuitionistic fuzzy set TOPSIS can be used to deal with the fuzziness of weights of indexes and qualitative indexes, and evaluation results obtained by using the model are more accurate than those by the catastrophe progression method, the attribute mathematical theory, the grey clustering method, the comprehensive index method, and the fuzzy factors method.

Experimental study on reducing dust at fully mechanized coal mining face by coal seam water injection

XIE Jianlin, PANG Jiewen, JIAN Jie, LI Chuantian

2017, 27(6): 151-156. doi:10.16265/j.cnki.issn1003-3033.2017.06.026

Asbtract ( 172 )

PDF (2931KB) ( 464 )

References | Related Articles | Metrics

In order to reduce the coal dust concentrations at fully mechanized mining faces and the harm of dust to miners and equipment, coal seam water injection experiments were carried out at the test mining face of No.3 coal seam in Xishan coal field. Dust concentrations and dispersion were measured at the measuring points of the mining face to analyze the coal seam water injection effect and its effects on the dust concentration and the particle size distribution. The results show that when the amount of water injected into the test seam through a single hole is 440 m³,the internal water content increases by average 1.02%, the external water content increases by average 2.21%, the distribution interval of coal dust particle sizes becomes shorter, the average particle size decreases, the total dust concentration at the whole mining face decreases by average 28%, the respiratory dust decreases by average 32%.

Research on definition, content and classification of hazards in seven standards

FU Gui, LI Ya

2017, 27(6): 157-162. doi:10.16265/j.cnki.issn1003-3033.2017.06.027

Asbtract ( 614 )

PDF (1247KB) ( 859 )

References | Related Articles | Metrics

Both effective identification and management of occupational safety risks require an unambiguous definition and a complete description to the hazard. The comparative analysis method was used to comb the definitions of a hazard in 7 standards and the factors to be considered in identifying hazards. The results of the analysis were used to study the content, classification and the relationship between the hazard and the hidden danger. The results show that the contents of a hazard have a very wide range. Energy, materials, human, human behaviors, the organization of humans, system, space and so on,all of these might be hazard, its classification strictly relies on accidents causation models,and that the hazard and the hidden danger are identical in the meaning.

Study on factors influencing competency of safety manager in SMEs

MEI Qiang, WANG Yanling, LIU Suxia

2017, 27(6): 163-168. doi:10.16265/j.cnki.issn1003-3033.2017.06.028

Asbtract ( 205 )

PDF (1477KB) ( 375 )

References | Related Articles | Metrics

In order to study the factors influence competency of safety managers in SMEs, 201 safety managers from SMEs in Yangtze River Delta Region were chosen to complete questionnaires. The method of SEM was used to study effects of career feature, working climate and personality on the competency of safety managers, and intermediary effects of both the knowledge and the skill. Results show that working climate and personality have a positive influence on the safety manager competency,that the influence of working climate is greater with route coefficient 0.43,and that personality directly affects safety manager competency and working climate indirectly affects safety manager competency in a positive way.

SD model for emergency disposal of construction safety accident caused by rainstorm disaster

CHEN Wei, QIAO Zhi, WANG Weizhen, ZHANG Kailan, NIU Li, DENG Cong

2017, 27(6): 169-174. doi:10.16265/j.cnki.issn1003-3033.2017.06.029

Asbtract ( 216 )

PDF (1784KB) ( 407 )

References | Related Articles | Metrics

In order to optimize allocation of emergency disposal resources and manage the construction safety accidents caused by rainstorm disasters effectively,six factors including personnel, equipment, materials, command, environment, information and correlations between them were systematically studied by using the system dynamics method. A construction safety accident emergency disposal SD model was built. 18 typical projects were used to carry on the empirical analysis. And an optimization strategy was put forward for the disposal. The result shows that the most important measure to improve the emergency disposal efficiency is increasing the speed and quality of information transmission during the early stage, increasing the decision efficiency of emergency command institution during the middle stage, and ensuring the dynamic allocation of the emergency resources in the whole process.

Table of Content