Pub Date : 2020-06-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.008
Jia Jian-qing, J. Chao, L. Yuanming, Zhao Yangyang, Wang Hongtu
In order to determine reinforcement effects and technical parameters of dynamic compaction on roadbedꎬ with silt and silty clay roadbed of a high speed railway as research objectꎬ bearing capacity and deformation law and features of reinforced roadbed by dynamic compaction at 15 and 20 m falling distances were studied through site experiment and numerical simulation. The results show that as tamping times increaseꎬ compaction settlement for each tamping decreases and gradually stabilizesꎬ and settlements of last two tamping of each falling distance can meet termination condition of engineering design. When dynamic compaction is appliedꎬ water contentꎬ dry density and specific penetration resistance of surface soil are all significantly improved with obvious reinforcement effect achieved in efficient reinforcement area. 第 6 期 贾剑青等: 高速铁路路基加固效果及稳定性分析 And bearing capacity characteristic values of roadbeds in three test points are greater than 150 kPaꎬ which meets designing requirements. In early stage of dynamic compactionꎬ numerical simulation results are slightly smaller than those of field testꎬ but they agree well with each other as tamping times increase.
{"title":"Reinforcement effect and stability analysis of high speed railway roadbed","authors":"Jia Jian-qing, J. Chao, L. Yuanming, Zhao Yangyang, Wang Hongtu","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.008","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.008","url":null,"abstract":"In order to determine reinforcement effects and technical parameters of dynamic compaction on roadbedꎬ with silt and silty clay roadbed of a high speed railway as research objectꎬ bearing capacity and deformation law and features of reinforced roadbed by dynamic compaction at 15 and 20 m falling distances were studied through site experiment and numerical simulation. The results show that as tamping times increaseꎬ compaction settlement for each tamping decreases and gradually stabilizesꎬ and settlements of last two tamping of each falling distance can meet termination condition of engineering design. When dynamic compaction is appliedꎬ water contentꎬ dry density and specific penetration resistance of surface soil are all significantly improved with obvious reinforcement effect achieved in efficient reinforcement area. 第 6 期 贾剑青等: 高速铁路路基加固效果及稳定性分析 And bearing capacity characteristic values of roadbeds in three test points are greater than 150 kPaꎬ which meets designing requirements. In early stage of dynamic compactionꎬ numerical simulation results are slightly smaller than those of field testꎬ but they agree well with each other as tamping times increase.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"9 1","pages":"50"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83835556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.023
Jiang Shuihua, Zeng Shaohui, Hu Jinsong, Yao Chi
In order to ensure seepage analysis accuracy of tailings damꎬ deduce hydraulic conductivity probability distribution of tailings material and to reduce its uncertaintyꎬ sequential probabilistic back analysis method of material parameters based on Bayesian updating was proposed. Thenꎬ a surrogate model of water table and likelihood function were constructed. Finallyꎬ with Daheishan tailings dam taken as an exampleꎬ sequential probabilistic back analysis of hydraulic conductivity of multi ̄layered tailings materials was conducted based on monitoring data of water tables. The results show that the proposed approach can effectively infer hydraulic conductivity and probability distributions as well as reduce their variation coefficients which is reduced by 18 25% for soil layer closer to monitoring points. Realistic uncertainties of hydraulic conductivity and representation cannot be well deduced only from monitoring information of water levelsꎬ and it is necessary to further collect field information of multiple sources and incorporate it into 第 6 期 蒋水华等: 尾矿材料渗透系数序贯概率反演分析 probabilistic back analysis.
{"title":"Sequential probabilistic back analysis on hydraulic conductivity of tailings materials","authors":"Jiang Shuihua, Zeng Shaohui, Hu Jinsong, Yao Chi","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.023","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.023","url":null,"abstract":"In order to ensure seepage analysis accuracy of tailings damꎬ deduce hydraulic conductivity probability distribution of tailings material and to reduce its uncertaintyꎬ sequential probabilistic back analysis method of material parameters based on Bayesian updating was proposed. Thenꎬ a surrogate model of water table and likelihood function were constructed. Finallyꎬ with Daheishan tailings dam taken as an exampleꎬ sequential probabilistic back analysis of hydraulic conductivity of multi ̄layered tailings materials was conducted based on monitoring data of water tables. The results show that the proposed approach can effectively infer hydraulic conductivity and probability distributions as well as reduce their variation coefficients which is reduced by 18 25% for soil layer closer to monitoring points. Realistic uncertainties of hydraulic conductivity and representation cannot be well deduced only from monitoring information of water levelsꎬ and it is necessary to further collect field information of multiple sources and incorporate it into 第 6 期 蒋水华等: 尾矿材料渗透系数序贯概率反演分析 probabilistic back analysis.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"35 1","pages":"158"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85681926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.025
Deng Wei, Xia Zhenghong
In order to address lack of a scientific quantitative evaluation method for plateau airports ' emergency support capacityꎬ firstlyꎬ content and features of these capabilities were studiedꎬ and operation characteristics of plateau airports and current situation of their emergency support were analyzed. Thenꎬ an evaluation index system was proposed which took into consideration emergency preparednessꎬ emergency monitoring and warningꎬ emergency response and rescueꎬ recovery and construction afterwards. And a comprehensive evaluation model based on AHP and multilevel matter element extension was established. Finallyꎬ by using this modelꎬ emergency rescue support capacity of one plateau airport in southwest China was evaluated based on its actual operation data. The results show that this airport has " high" emergency support capabilityꎬ and among all secondary indicatorsꎬ only " recovery and construction afterwards" is rated as " general" . Such evaluation results are basically consistent with conclusions of its annual work 第 6 期 邓伟等: 高原机场应急保障能力评价方法 report on emergency managementꎬ which verifies rationality of the proposed evaluation index system and model.
{"title":"Evaluation method for plateau airports' emergency support capacity","authors":"Deng Wei, Xia Zhenghong","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.025","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.025","url":null,"abstract":"In order to address lack of a scientific quantitative evaluation method for plateau airports ' emergency support capacityꎬ firstlyꎬ content and features of these capabilities were studiedꎬ and operation characteristics of plateau airports and current situation of their emergency support were analyzed. Thenꎬ an evaluation index system was proposed which took into consideration emergency preparednessꎬ emergency monitoring and warningꎬ emergency response and rescueꎬ recovery and construction afterwards. And a comprehensive evaluation model based on AHP and multilevel matter element extension was established. Finallyꎬ by using this modelꎬ emergency rescue support capacity of one plateau airport in southwest China was evaluated based on its actual operation data. The results show that this airport has \" high\" emergency support capabilityꎬ and among all secondary indicatorsꎬ only \" recovery and construction afterwards\" is rated as \" general\" . Such evaluation results are basically consistent with conclusions of its annual work 第 6 期 邓伟等: 高原机场应急保障能力评价方法 report on emergency managementꎬ which verifies rationality of the proposed evaluation index system and model.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"10 1","pages":"172"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74529219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.012
BI Aorui, Luo Zhengshan, Song Yingying, Z. Xinsheng
In order to explore residual strength of submarine pipelines with internal corrosionꎬ and provide reference for maintenance so as to ensure safe operationꎬ a FOA ̄GRNN calculation method of residual strength was proposed and a prediction model was constructed by using GRNN based on influencing factors like wall thicknessꎬ diameterꎬ corrosion depthꎬ lengthꎬ width and ultimate tensile strength. Thenꎬ FOA was used to optimize the modelꎬ and negative influence of smooth factors were set artificially. Influencing factors and residual strength database were simulated and generated by finite element methodꎬ and trained and predicted through FOA ̄GRNN model. Finallyꎬ with experimental data of pipeline ultimate strength blasting from PETROBRAS Research Institute as an exampleꎬ the prediction model was verified. The results show that average relative error of FOA ̄GRNN model is 16 53% for residual strength prediction of finite element simulation dataꎬ and 7 81% for experimental data predictionꎬ 第 6 期 毕傲睿等: 内腐蚀海底管道剩余强度的 FOA ̄GRNN 模型 which are reasonable and accurate.
{"title":"Residual strength analysis of internally corroded submarine pipeline based on FOA-GRNN model","authors":"BI Aorui, Luo Zhengshan, Song Yingying, Z. Xinsheng","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.012","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.012","url":null,"abstract":"In order to explore residual strength of submarine pipelines with internal corrosionꎬ and provide reference for maintenance so as to ensure safe operationꎬ a FOA ̄GRNN calculation method of residual strength was proposed and a prediction model was constructed by using GRNN based on influencing factors like wall thicknessꎬ diameterꎬ corrosion depthꎬ lengthꎬ width and ultimate tensile strength. Thenꎬ FOA was used to optimize the modelꎬ and negative influence of smooth factors were set artificially. Influencing factors and residual strength database were simulated and generated by finite element methodꎬ and trained and predicted through FOA ̄GRNN model. Finallyꎬ with experimental data of pipeline ultimate strength blasting from PETROBRAS Research Institute as an exampleꎬ the prediction model was verified. The results show that average relative error of FOA ̄GRNN model is 16 53% for residual strength prediction of finite element simulation dataꎬ and 7 81% for experimental data predictionꎬ 第 6 期 毕傲睿等: 内腐蚀海底管道剩余强度的 FOA ̄GRNN 模型 which are reasonable and accurate.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"50 1","pages":"78"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80616568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.022
Li Yanfeng, Yin Jiaxiao, Li Chaofeng, Wang Wei, Y. Xiaochen, Li Zipeng
In order to ensure safe operation of urban water supply network at different levelsꎬ based on resilience analysis and seismic damage mechanism of networkꎬ a seismic safety resilience evaluation index system of the network was established which considered pipelines' physical propertiesꎬ external environment and hydraulic function in pipes. Thenꎬ projection pursuit method was introduced to project evaluation index linearlyꎬ and a projection pursuit cluster model for assessment was established to analyze seismic safety resilience level and to obtain resilience grade and order of each pipes. Finallyꎬ this model was applied to evaluate a water supply networkꎬ and its assessment results were compared with those 第 6 期 李岩峰等: 基于投影寻踪聚类的供水管网地震韧性评估 obtained by dynamic classification method and pedigree clustering method. The results show that the proposed evaluation model based on projection pursuit cluster can successfully grade and rank seismic safety resilience of water supply network and comprehensively reflect influence of different elements including pipes' material and connection type.
{"title":"Assessment on seismic resilience of water supply network based on projection pursuit cluster","authors":"Li Yanfeng, Yin Jiaxiao, Li Chaofeng, Wang Wei, Y. Xiaochen, Li Zipeng","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.022","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.022","url":null,"abstract":"In order to ensure safe operation of urban water supply network at different levelsꎬ based on resilience analysis and seismic damage mechanism of networkꎬ a seismic safety resilience evaluation index system of the network was established which considered pipelines' physical propertiesꎬ external environment and hydraulic function in pipes. Thenꎬ projection pursuit method was introduced to project evaluation index linearlyꎬ and a projection pursuit cluster model for assessment was established to analyze seismic safety resilience level and to obtain resilience grade and order of each pipes. Finallyꎬ this model was applied to evaluate a water supply networkꎬ and its assessment results were compared with those 第 6 期 李岩峰等: 基于投影寻踪聚类的供水管网地震韧性评估 obtained by dynamic classification method and pedigree clustering method. The results show that the proposed evaluation model based on projection pursuit cluster can successfully grade and rank seismic safety resilience of water supply network and comprehensively reflect influence of different elements including pipes' material and connection type.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"6 1","pages":"152"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82022205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.016
Liu Jing, Chen Xianfeng, Zhang Bo, Gao Wenao, Zhao Qi, Sun Wei-kang
In order to explore impacts of methane content on coal explosion process and to master flame propagation law of coal ̄methane explosionꎬ particle size and pyrolysis process of two kinds of coal powder samples were studied by a particle size analyzer and a synchronous thermal analyzer. Thenꎬ a 1 500 mm× 80 mm× 80 mm semi ̄open vertical combustion pipe was used to analyze impacts of coal powder at median particle size of 65 and 25 μm for different methane volume fractions on structureꎬ temperature and velocity of methane ̄coal dust compound flame. The results show that coal flame for 25 μm is brighter than that for 65 μmꎬ and increase in methane volume fraction has a stronger promotion effect on 65 μm coal dust flame. When volume fraction approaches the equivalence ratioꎬ the more regular flame front isꎬ the greater flame velocity is. And as it increasesꎬ both flame temperature and velocity show a trend of increasing first and then decreasing. Flame temperature reaches the maximum value at the content of 9%ꎬ and the maximum 第 6 期 刘静等: 甲烷体积分数对甲烷-煤粉复合火焰传播特性的影响 flame velocity of 65 and 25 μm pulverized coal are 26 53 and 39 28 m / s when it is 8% and 10% respectively.
{"title":"Impacts of methane content on compound flame propagation characteristics of methane-coal dust","authors":"Liu Jing, Chen Xianfeng, Zhang Bo, Gao Wenao, Zhao Qi, Sun Wei-kang","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.016","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.016","url":null,"abstract":"In order to explore impacts of methane content on coal explosion process and to master flame propagation law of coal ̄methane explosionꎬ particle size and pyrolysis process of two kinds of coal powder samples were studied by a particle size analyzer and a synchronous thermal analyzer. Thenꎬ a 1 500 mm× 80 mm× 80 mm semi ̄open vertical combustion pipe was used to analyze impacts of coal powder at median particle size of 65 and 25 μm for different methane volume fractions on structureꎬ temperature and velocity of methane ̄coal dust compound flame. The results show that coal flame for 25 μm is brighter than that for 65 μmꎬ and increase in methane volume fraction has a stronger promotion effect on 65 μm coal dust flame. When volume fraction approaches the equivalence ratioꎬ the more regular flame front isꎬ the greater flame velocity is. And as it increasesꎬ both flame temperature and velocity show a trend of increasing first and then decreasing. Flame temperature reaches the maximum value at the content of 9%ꎬ and the maximum 第 6 期 刘静等: 甲烷体积分数对甲烷-煤粉复合火焰传播特性的影响 flame velocity of 65 and 25 μm pulverized coal are 26 53 and 39 28 m / s when it is 8% and 10% respectively.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"293 1","pages":"106"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79519523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.001
Zhao Jianqiang, Xiong Yanming, Zhang Youjian
In order to avoid single indicator ̄based design flawꎬ a multi ̄objective optimization design method of safety system based on isolation ̄inoperability competing failure mechanism was proposed. Considering that the core of this method was thresholds setting of isolation component and inoperability componentꎬ three performance indicesꎬ including PLOASꎬ reliability lossꎬ mass costꎬ were utilized to express influence of thresholds setting on system safetyꎬ reliabilityꎬ and mass respectively. On this basisꎬ a relevant multi ̄objective optimization function was establishedꎬ and linear weighted method was applied to converse multi ̄objective optimization problem to a single one. The results show that the proposed method is suitable for solving multi ̄objective optimization problem based on isolation ̄inoperability competing failure mechanismꎬ and Pareto solution sets can be obtained not only for three objectives optimization problemꎬ 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 but also for two objectives optimization problem under strong restriction of safety.
{"title":"Multi-objective optimization design for safety system based on isolation-inoperability competing failure mechanism","authors":"Zhao Jianqiang, Xiong Yanming, Zhang Youjian","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.001","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.001","url":null,"abstract":"In order to avoid single indicator ̄based design flawꎬ a multi ̄objective optimization design method of safety system based on isolation ̄inoperability competing failure mechanism was proposed. Considering that the core of this method was thresholds setting of isolation component and inoperability componentꎬ three performance indicesꎬ including PLOASꎬ reliability lossꎬ mass costꎬ were utilized to express influence of thresholds setting on system safetyꎬ reliabilityꎬ and mass respectively. On this basisꎬ a relevant multi ̄objective optimization function was establishedꎬ and linear weighted method was applied to converse multi ̄objective optimization problem to a single one. The results show that the proposed method is suitable for solving multi ̄objective optimization problem based on isolation ̄inoperability competing failure mechanismꎬ and Pareto solution sets can be obtained not only for three objectives optimization problemꎬ 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 but also for two objectives optimization problem under strong restriction of safety.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"13 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89733828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.017
Wang Junwu, Hu Die, Wu Han, W. Mengyu, Liu Denghui
In order to identify construction risk of small ̄diameter deep drainage tunnel shields and accurately evaluate risk levelꎬ a HAZOP ̄based risk identification method and an evaluation method based on rough sets and cloud models were proposed. Firstlyꎬ construction risks were identified comprehensively by using HAZOP and an evaluation index system was established according to attribute reduction theory of rough sets. Thenꎬ a risk assessment model for small ̄diameter tunnel shield construction was established by combining rough sets and cloud model. Finallyꎬ the model was verified with deep tunnel project of East Lake as an example. The results show that evaluations of the model are basically consistent with actual situationꎬ and major factors causing high ̄ level construction risks include delayed adjustment of tunneling parametersꎬ deficient training and evaluationꎬ clogged grouting pipesꎬ falling down of hoisting equipmentꎬ and unspecific engineering geological and hydrogeological surveysꎬ and they should be checked and avoided.
{"title":"Risk assessment in construction of small-diameter deep drainage tunnel","authors":"Wang Junwu, Hu Die, Wu Han, W. Mengyu, Liu Denghui","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.017","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.017","url":null,"abstract":"In order to identify construction risk of small ̄diameter deep drainage tunnel shields and accurately evaluate risk levelꎬ a HAZOP ̄based risk identification method and an evaluation method based on rough sets and cloud models were proposed. Firstlyꎬ construction risks were identified comprehensively by using HAZOP and an evaluation index system was established according to attribute reduction theory of rough sets. Thenꎬ a risk assessment model for small ̄diameter tunnel shield construction was established by combining rough sets and cloud model. Finallyꎬ the model was verified with deep tunnel project of East Lake as an example. The results show that evaluations of the model are basically consistent with actual situationꎬ and major factors causing high ̄ level construction risks include delayed adjustment of tunneling parametersꎬ deficient training and evaluationꎬ clogged grouting pipesꎬ falling down of hoisting equipmentꎬ and unspecific engineering geological and hydrogeological surveysꎬ and they should be checked and avoided.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"86 1","pages":"113"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90184197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.015
Yu Zhi-jin, Yang Song, Gu‐Sheng Yu, Deng Jun
In order to investigate heat transfer characteristics of LCO2 injected in loose coal and study influence of injection parameters on temperature field of coalꎬ experiments on LCO2 injection process were carried out by using self ̄made test platform. Thenꎬ temperature changes of coal and influence of injection parameters on refrigeration range were analyzed. The results show that when LCO2 is injected into loose coalꎬ phase transition occurs immediatelyꎬ and an intensive heat transfer process starts and forms a phase ̄ change cooling area (<-56 6 °C) which sees a logarithm increase over injection time in direction of CO2 jet. Meanwhileꎬ the cooling area increases in a form of exponentialꎬ logarithm and linear function respectively along with increase of injection flowꎬ caliber and pressure.
{"title":"Experimental investigation on phase transition and heat transfer characteristics for liquid carbon dioxide in loose coal","authors":"Yu Zhi-jin, Yang Song, Gu‐Sheng Yu, Deng Jun","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.015","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.015","url":null,"abstract":"In order to investigate heat transfer characteristics of LCO2 injected in loose coal and study influence of injection parameters on temperature field of coalꎬ experiments on LCO2 injection process were carried out by using self ̄made test platform. Thenꎬ temperature changes of coal and influence of injection parameters on refrigeration range were analyzed. The results show that when LCO2 is injected into loose coalꎬ phase transition occurs immediatelyꎬ and an intensive heat transfer process starts and forms a phase ̄ change cooling area (<-56 6 °C) which sees a logarithm increase over injection time in direction of CO2 jet. Meanwhileꎬ the cooling area increases in a form of exponentialꎬ logarithm and linear function respectively along with increase of injection flowꎬ caliber and pressure.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"14 1","pages":"98"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90231074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.018
Liang Zhenming, Niu Yi, Fan Yun-xiao, Wang Rui
In order to fully explore differences of truck accident characteristics in different regions and prevent high occurrence of truck accidentsꎬ methods such as taxonomy and social network analysis were applied to study data of major accidents in Zhejiang from South and Jilin Province from North respectively. Thenꎬ based on preliminary classification analysis of dataꎬ a network diagram of influencing factors and a ranking table of centrality were constructedꎬ and two sets of data were compared. The results show that there are great differences in numberꎬ severityꎬ cause and complexity of truck accidents between two provinces. Weather conditionꎬ vehicle type and fatigue driving are important factors that affect accident severity while region differenceꎬ weather and driving experience exert comparatively significant influence on unsafe driving behaviors.
{"title":"Research on characteristics of expressway truck accidents in different regions","authors":"Liang Zhenming, Niu Yi, Fan Yun-xiao, Wang Rui","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.018","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.018","url":null,"abstract":"In order to fully explore differences of truck accident characteristics in different regions and prevent high occurrence of truck accidentsꎬ methods such as taxonomy and social network analysis were applied to study data of major accidents in Zhejiang from South and Jilin Province from North respectively. Thenꎬ based on preliminary classification analysis of dataꎬ a network diagram of influencing factors and a ranking table of centrality were constructedꎬ and two sets of data were compared. The results show that there are great differences in numberꎬ severityꎬ cause and complexity of truck accidents between two provinces. Weather conditionꎬ vehicle type and fatigue driving are important factors that affect accident severity while region differenceꎬ weather and driving experience exert comparatively significant influence on unsafe driving behaviors.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"9 1","pages":"121"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89066208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：