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.ISSN1003-3033.2020.06.004
Du Xiuli, Cao Xiuxiu, Zhong Zilan, Hou Benwei, Wang Wei
In order to address uncertainties of geotechnical parameters and loads in pile foundation designꎬ firstlyꎬ a RGD method considering multiple failure modes was proposed. Four typical failure modesꎬ vertical ultimate limit state (ULS)ꎬ vertical serviceability limit state (SLS)ꎬ horizontal strength failure and horizontal deformation failure were analyzed. Thenꎬ Monte Carlo simulation (MCS) and point estimate method (PEM) nesting were adopted to compute mean value and standard deviation of failure probability for soil ̄pile foundation systemꎬ and the latter was used as an indicator to measure robustness. Finallyꎬ optimal design of soil ̄pile foundation system was finalized with robustness and cost as objectives. The results show that piles with different geometries have different dominant failure modes. With the increase of geometriesꎬ key failure mode changes from horizontal strength failure to vertical SLSꎬ which has significant influence on gradient of of system' failure probability. 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年
{"title":"Robust geotechnical design of soil-pile foundation system considering multiple failure modes","authors":"Du Xiuli, Cao Xiuxiu, Zhong Zilan, Hou Benwei, Wang Wei","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.004","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.004","url":null,"abstract":"In order to address uncertainties of geotechnical parameters and loads in pile foundation designꎬ firstlyꎬ a RGD method considering multiple failure modes was proposed. Four typical failure modesꎬ vertical ultimate limit state (ULS)ꎬ vertical serviceability limit state (SLS)ꎬ horizontal strength failure and horizontal deformation failure were analyzed. Thenꎬ Monte Carlo simulation (MCS) and point estimate method (PEM) nesting were adopted to compute mean value and standard deviation of failure probability for soil ̄pile foundation systemꎬ and the latter was used as an indicator to measure robustness. Finallyꎬ optimal design of soil ̄pile foundation system was finalized with robustness and cost as objectives. The results show that piles with different geometries have different dominant failure modes. With the increase of geometriesꎬ key failure mode changes from horizontal strength failure to vertical SLSꎬ which has significant influence on gradient of of system' failure probability. 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"13 1","pages":"23"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75624341","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.ISSN1003-3033.2020.06.006
Fu Shigen, Liu Quanming, Huang Jiaguo, Dong Hewei
In order to prevent harm caused by respiratory dust and to monitor mass concentration of individual exhalation dustꎬ a portable personal concentration monitoring test prototype was developed by using infrared light emitting photodiode as a light source according to principle of light scatteringꎬ and its pneumatic control circuit and optical control and detection circuit were designed. Thenꎬ prototype and comparison instrument were put in a self ̄made dust test device together with dust gas which featured a flow rate of 2 L / min and a particle size of 5 μm. The results show that when mass concentration of dust is between 0-150 mg / mꎬ measured voltage of prototype increases along with increase of dust concentrationꎬ and they maintain a good linear relationship. The relative error between measured concentration value of prototype by using regression equation and that of comparison instrument is within ±4%ꎬ indicating that the 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 device meets requirements of relevant dust verification regulations.
为了防止呼吸道粉尘的危害，监测个人呼出粉尘的质量浓度ꎬ根据光散射原理，研制了一种以红外发光光电二极管为光源的便携式个人浓度监测试验样机ꎬ，并设计了其气动控制电路和光学控制检测电路。将ꎬ样机和对比仪与流量为2 L / min、粒径为5 μm的粉尘气体一起放入自制的粉尘试验装置中。结果表明:当粉尘质量浓度为0 ~ 150 mg / mꎬ时，样机的实测电压随粉尘浓度的增加而增加ꎬ，两者保持良好的线性关系。回归方程对样机测定的浓度值与比较仪测定的浓度值的相对误差在±4%ꎬ以内，表明该装置符合相关粉尘检定规程的要求。
{"title":"Application research of light scattering principle in dust measurement system","authors":"Fu Shigen, Liu Quanming, Huang Jiaguo, Dong Hewei","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.006","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.006","url":null,"abstract":"In order to prevent harm caused by respiratory dust and to monitor mass concentration of individual exhalation dustꎬ a portable personal concentration monitoring test prototype was developed by using infrared light emitting photodiode as a light source according to principle of light scatteringꎬ and its pneumatic control circuit and optical control and detection circuit were designed. Thenꎬ prototype and comparison instrument were put in a self ̄made dust test device together with dust gas which featured a flow rate of 2 L / min and a particle size of 5 μm. The results show that when mass concentration of dust is between 0-150 mg / mꎬ measured voltage of prototype increases along with increase of dust concentrationꎬ and they maintain a good linear relationship. The relative error between measured concentration value of prototype by using regression equation and that of comparison instrument is within ±4%ꎬ indicating that the 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 device meets requirements of relevant dust verification regulations.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"194 1","pages":"37"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79744684","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}
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