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Robust geotechnical design of soil-pile foundation system considering multiple failure modes 考虑多种破坏模式的桩土基础体系的鲁棒性设计
中国安全科学学报 Pub Date : 2020-06-28 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.004
Du Xiuli, Cao Xiuxiu, Zhong Zilan, Hou Benwei, Wang Wei
{"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}
引用次数: 0
A prediction method for bounced landing of aircraft based on DBN 基于DBN的飞机弹跳着陆预测方法
中国安全科学学报 Pub Date : 2020-06-28 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.013
Jia Bo, Sun Yanjin, Zhang Guiming
{"title":"A prediction method for bounced landing of aircraft based on DBN","authors":"Jia Bo, Sun Yanjin, Zhang Guiming","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.013","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.013","url":null,"abstract":"In order to grasp causes of bounced landing of aircraft which is a frequently occurring issue during flight operationꎬ and effectively prevent such incidentsꎬ a prediction method for bounced landing based on DBN was proposed. Secondlyꎬ correlation between incidents and landing airports ' environment was evaluated by using aviation dataꎬ and with an actual incident of China Eastern Airlines as an exampleꎬ changing trend of bounced landing along with throttle stick position at touchdown was explored. Thenꎬ impacts of pilot controlꎬ aircraft status and unstable approach on incidents were discussed. Finallyꎬ different combinations of information were used as inputs to train the modelꎬ and their prediction accuracy was compared to find optimal one. The results show that DBN ̄based method is suitable for predicting bounced landing by utilizing flight data. When network input includes direct influencing factors such as airports' environmentꎬ throttle lever positionꎬ as well as indirect ones like unstable approachꎬ this model can accurately predict accidents with a prediction accuracy as high as 94􀆰 78%.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"44 1","pages":"84"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86325800","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}
引用次数: 1
Structural equation model between safety accidents and network capability of construction enterprises 安全事故与施工企业网络能力的结构方程模型
中国安全科学学报 Pub Date : 2020-06-28 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.009
Zhang Jianshe, Zhang Wenyu, chen ruiya, Lu Chunyang, Wang Tianxing
{"title":"Structural equation model between safety accidents and network capability of construction enterprises","authors":"Zhang Jianshe, Zhang Wenyu, chen ruiya, Lu Chunyang, Wang Tianxing","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.009","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.009","url":null,"abstract":"In order to investigate how safety accidents affect network capability of construction enterprisesꎬ connotation of network capability was defined and it was divided into five dimensionsꎬ network visionꎬ network constructionꎬ network managementꎬ network learning and emotional embedding. Thenꎬ hypothesis of relationship between safety accidents and network capability was put forwardꎬ data were collected through questionnaire survey and empirical analysis was made using SEM. The results show that safety incidents have a significant and direct impact on network visionꎬ network constructionꎬ network management and emotional embeddingꎬ among which influence on network vision and emotional embedding is greater than that on network construction and network management. And they exert a significant and indirect impact on network learning through intermediary role of network vision and emotional embeddingꎬ among which that role of emotional embedding is greater than that of network vision. Thereforeꎬ construction enterprises can reduce impacts of safety accidents on network capacity through strategic planning of network in timeꎬ strengthening coordination between organizations and emotional ties.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"1 1","pages":"57"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86362072","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}
引用次数: 0
Application research of light scattering principle in dust measurement system 光散射原理在粉尘测量系统中的应用研究
中国安全科学学报 Pub Date : 2020-06-28 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.006
Fu Shigen, Liu Quanming, Huang Jiaguo, Dong Hewei
{"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}
引用次数: 1
Flow field characteristics of fire plume in different restricted forms based on PIV 基于PIV的不同约束形式火羽流场特征
中国安全科学学报 Pub Date : 2020-06-28 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.020
Zhang Wei, Z. Ying, Liu Changwei, Yuan Dachao
{"title":"Flow field characteristics of fire plume in different restricted forms based on PIV","authors":"Zhang Wei, Z. Ying, Liu Changwei, Yuan Dachao","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.020","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.020","url":null,"abstract":"In order to explore effects of different restricted forms on flow field of fire plumeꎬ fine thermocouple and PIV technologies were used to monitor fire plume's heightꎬ temperature and flow field of diffusion burner in free spaceꎬ side wall space and corner spaceꎬ and then flow field characteristics in different restricted forms were studied. The experimental results show that when dimensionless source power Q is less than 1􀆰 5ꎬ dimensionless flame height Lf / D increases linearly which will become steady approximately when Q exceeds 1􀆰 5. Lateral velocity in different restricted spaces all conform to approximate Gaussian distributionsꎬ and sidewall space and corner space cause a certain deviation of flame center. Vortex diameter is between 3􀆰 5 and 8 cm at Q is 1􀆰 982ꎬ and its size gradually increase along with increase of side wall surface because vortex will fall offꎬ which will release a lot of heat in a short time and exerts a stretching impact on fire plume. As a resultꎬ combustion reaction of fire is promotedꎬ and then a larger vortex is generated.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"19 1","pages":"135"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73695679","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}
引用次数: 1
Influencing factors on explosion and toxicity of high-sulfur natural gas 高硫天然气爆炸及毒性的影响因素
中国安全科学学报 Pub Date : 2020-06-28 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.007
Xiao Junfeng, Chen Jian, Dai Chengcheng, Lu Ping
{"title":"Influencing factors on explosion and toxicity of high-sulfur natural gas","authors":"Xiao Junfeng, Chen Jian, Dai Chengcheng, Lu Ping","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.007","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.007","url":null,"abstract":"In order to study interrelation between influencing factors in high ̄sulfur natural gas leakage accidentsꎬ single ̄factor analysis and uniform design method were used to study influence of CH4 and H2S content ratioꎬ ventilation rate and pipeline pressure on explosion and toxicity risk of high ̄sulfur natural gas based on numerical simulation by FLACS software. The results show that factors influencing explosion limit of natural gas is ventilation rate > pipe pressure > CH4 and H2S content ratioꎬ among which the first factor is negatively correlated with limit range while the other two are positively correlated with itꎬ and ventilation rate has the most significant effect. It is the opposite for factors that affect gas leakage toxicity which is negatively correlated with ventilation rate and content ratio but positively correlated with pipeline pressureꎬ and content ratio exerts the most significant effect on gas toxicity.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"1 1","pages":"43"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88827549","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}
引用次数: 1
Flame characteristics of ceiling jet flow driven by strong plume in bifurcation tunnels 分岔巷道强羽流驱动顶棚射流火焰特性研究
中国安全科学学报 Pub Date : 2020-06-28 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.06.024
Zhisheng Li, Gao Yunji, Xiaosong Li, Yu-chun Zhang, Pengfei Mao
{"title":"Flame characteristics of ceiling jet flow driven by strong plume in bifurcation tunnels","authors":"Zhisheng Li, Gao Yunji, Xiaosong Li, Yu-chun Zhang, Pengfei Mao","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.024","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.024","url":null,"abstract":"In order to explore transverse and longitudinal length and flame area distribution features of ceiling jet flow driven by strong plume in a bifurcation tunnelꎬ 5 groups of fire locations (0􀆰 1ꎬ 0􀆰 3ꎬ 0􀆰 5ꎬ 0􀆰 7 and 0􀆰 9 m) and 4 HRR (47􀆰 9ꎬ 63􀆰 8ꎬ 77􀆰 7 and 95􀆰 7 kW) were selected. Transverse lengths of intermittent flame and transverse continuous flame for typical working conditions were calculated and corresponding critical temperature values were determinedꎬ which were 325 and 620 °C respectively. Based on critical values of continuous flameꎬ its transverse and longitudinal flame length as well as flame area were obtained. The results show that there is a non ̄monotonic trend for transverse flame length as distance from fire source to sidewall increases from 0􀆰 1 m to 0􀆰 7 mꎬ and it will reach maximum value at 0􀆰 3 m. Neverthelessꎬ longitudinal length continuously decreases as distance rises from 0􀆰 1 m to 0􀆰 9 mꎬ and it is always larger than transverse length under same conditions. Flame area increases first with spacing grows 第 6 期 李智胜等: 分岔隧道强羽流驱动的顶棚射流火焰特征 from 0􀆰 1 m to 0􀆰 3 m and then decreases as it continuously increases to 0􀆰 7 m.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"24 1","pages":"166"},"PeriodicalIF":0.0,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80459005","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}
引用次数: 1
基于“2-4”模型的建筑电气火灾事故直接原因研究 基于“2-4”模型的建筑电气火灾事故直接原因研究
中国安全科学学报 Pub Date : 2020-04-28 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.015
孙世梅, 耿晓帅, 傅贵
{"title":"基于“2-4”模型的建筑电气火灾事故直接原因研究","authors":"孙世梅, 耿晓帅, 傅贵","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.015","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.015","url":null,"abstract":"","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"41 5-6","pages":"93"},"PeriodicalIF":0.0,"publicationDate":"2020-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72459428","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}
引用次数: 0
Optimization of AEB trigger width based on pedestrian crossing scenario 基于行人过路场景的AEB触发宽度优化
中国安全科学学报 Pub Date : 2020-04-28 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.022
H. Xia, Zhang Daowen, Che Yaoyue, Liu Qi, Dong Xiaofei, Dong Honglei
{"title":"Optimization of AEB trigger width based on pedestrian crossing scenario","authors":"H. Xia, Zhang Daowen, Che Yaoyue, Liu Qi, Dong Xiaofei, Dong Honglei","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.022","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.022","url":null,"abstract":"In order to study influence of trigger width on pedestrian crossing scenario results in AEB control strategyꎬ road and vehicle models were built by using automatic driving simulation software PreScan. Thenꎬ AEB longitudinal control algorithm was designed in Matlab model’ s control platform Simulink to simulate pedestrians crossing scenarios. And trigger width was continuously adjusted to observe whether collision was avoided. The results show that when car speed is 30-50 km / hꎬ the system's trigger width is at 1􀆰 75 mꎬ which can help avoid collision effectively. When speed is 50-80 km / hꎬ it needs to 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 increase along with the increase of pedestrian speed. The wider it isꎬ the more information car receivesꎬ and the more possible AEB malfunction will be. Thereforeꎬ the maximum trigger width is set to be 3􀆰 5 m. When car speed reaches between 60-80 km / hꎬ it is necessary to optimize alue and full braking advance time simultaneously so as to avoid collision.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"15 1","pages":"141"},"PeriodicalIF":0.0,"publicationDate":"2020-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79996390","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}
引用次数: 1
Competitive adsorption difference during coal spontaneous combustion process in noble gas atmosphere 稀有气体气氛中煤自燃过程的竞争吸附差异
中国安全科学学报 Pub Date : 2020-04-28 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.010
Lou Hezhuang, Jiang Tinggui
{"title":"Competitive adsorption difference during coal spontaneous combustion process in noble gas atmosphere","authors":"Lou Hezhuang, Jiang Tinggui","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.010","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.010","url":null,"abstract":"In order to explore spontaneous combustion characteristics in low temperature oxidation process of coal after absorption in CO2 and N2 atmospheresꎬ with anthracite coal in No. 9 coal seam of Sihe No. 2 mine taken as research objectꎬ warming test and TG test of coal during low temperature oxidation were conducted to analyze gas product characteristics and weight loss characteristics of CO and CH4 during spontaneous combustion of coal. Thenꎬ a physical adsorption model of different gas moleculesꎬ such as O2ꎬ CO2 and N2ꎬ was established on the surface of coal macromoleculesꎬ and adsorption of O2 gas molecules was analyzed from a micro perspective using grand canonical Monte Carlo simulation (GCMC) method. Finallyꎬ difference in competitive adsorption between mixed gas molecules on surface of coal macromolecules were discussed. The research shows that spontaneous combustion characteristics of coal in low temperature oxidation process change after adsorption in CO2 and N2 atmospheresꎬ with concentration 第 4 期 娄和壮等: 惰性气氛对煤自燃过程的竞争吸附差异性研究 of CO and CH4 gas products being reduced and rate of weight loss of coal spontaneous combustion decreasingꎬ thus inhibiting low temperature oxidation capacity of coal. The mixed adsorption of coal macromolecules on gas moleculesꎬ like CO2 and N2ꎬ suppresses their adsorption of O2 molecules. And gas competitive adsorption on coal surface ranks as H2O>CO2>N2>O2>CH4>CO.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"7 1","pages":"60"},"PeriodicalIF":0.0,"publicationDate":"2020-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80587490","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}
引用次数: 6
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