盾构管片接头破坏类型及参数敏感性分析
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摘要
盾构管片接头是整环管片力学性能的薄弱部位,容易发生破坏。通过分析盾构管片接头的受力特性、管片接头的破坏类型以及管片内力和其影响因素之间的关系,再进行人工神经网络敏感性分析,计算得到不同影响因素的相对重要性指数大小。研究结果表明:盾构管片接头的破坏类型为受拉破坏;管片外径(RI=54.4%)对管片最大拉应力影响最大,其次是围岩等级(RI=35.3%),隧道埋深和混凝土强度对管片最大拉应力影响较小,相对重要性指数RI小于6%。
The joints of the lining structure,the weak and key parts of the mechanical properties,are the most vulnerable parts of the whole segment.In this paper,the internal force characteristics of the shield segment joint,failure type of segment joint and the relationship between the tensile stress of the shield segment and influencing factors are presented.An artificial neural network(ANN)-based sensitivity analysis was performed to obtain insight into the relative importance of the influencing factors.The results indicates that the failure type of the pipe joint is tensile failure.The diameter of shield segment and the grade of surrounding rock are the primary influencing factor with RI=54.4% and RI=35.3%,respectively.The tunnel depth and strength of concrete are the secondary influencing factors with RI less than 6%.
The joints of the lining structure,the weak and key parts of the mechanical properties,are the most vulnerable parts of the whole segment.In this paper,the internal force characteristics of the shield segment joint,failure type of segment joint and the relationship between the tensile stress of the shield segment and influencing factors are presented.An artificial neural network(ANN)-based sensitivity analysis was performed to obtain insight into the relative importance of the influencing factors.The results indicates that the failure type of the pipe joint is tensile failure.The diameter of shield segment and the grade of surrounding rock are the primary influencing factor with RI=54.4% and RI=35.3%,respectively.The tunnel depth and strength of concrete are the secondary influencing factors with RI less than 6%.
引文
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[3]毕湘利,柳献,王秀志,等.通缝拼装盾构隧道结构极限承载力的足尺试验研究[J].土木工程学报,2014,47(10):117-127.BI Xiangli,LIU Xian,WANG Xiuzhi,et al.Experimental investigation on the ultimate bearing capacity of continuous-jointed segmental tunnel linings[J].China Civil Engineering Journal,2014,47(10):117-127.
[4]朱合华,黄伯麒,李晓军,等.盾构衬砌管片接头内力变形统一模型及试验分析[J].岩土工程学报,2014,36(12):2153-2160.ZHU Hehua,HUANG Bolin,LI Xiaojun,et al.Unified model for internal force and deformation of shield segment joints and experimental analysis[J].Chinese Journal of Geotechnical Engineering,2014,36(12):2153-2160.
[5]梁英俊.土层侧压力系数试验测定及其对盾构管片内力的影响分析[D].北京:北京交通大学,2011.LIANG Yingjun.Test of lateral pressure coefficient of soil layer and its influence on internal force of shield segment[D].Beijing:Beijing Jiaotong University,2011.
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[7]丁军霞,冯卫星,杜学玲.盾构隧道管片衬砌内力及变形的影响因素分析[J].石家庄铁道学院学报,2004(3):75-79.DING Junxia,FENG Weixing,DU Xueling.Analysis of influence factors on internal force and deformation of shield tunnel lining[J].Journal of Shijiazhuang Railway Institute,2004(3):75-79.
[8]艾辉军.基于三维非连续接触模型的管片与接头结构力学特性研究[D].长沙:中南大学,2014.AI Huijun.Study on mechanical properties of tube and joint structure based on three dimensional discontinuous Ashimo H,Ishimura T,Evaluation of the load on shield tunnel lining in grave[J].Changsha;Central South University,2014.
[9]Chungsik Yoo.Ground settlement during tunneling in groundwater drawdown environment-Influencing factors[J].Underground Space,2016,1(1):20-29.
[10]张鹏.地铁盾构隧道管片接头的理论分析及应用研究[D].北京:北京交通大学,2011.ZHANG Peng.Theoretical analysis and application research on the segment joint of metro shield tunnel[D].Beijing:Beijing Jiaotong University,2011.
[11]Hornik,K,Stinchcombe M,White H.Multilayer feedforward ntworks are universal approximator[J].Neural Networks,1989,2(5):359-366.
[12]Garson G D.Interpreting neural-network connection weights[J].AI Expert,1991,6(7):47-51.
[2]杨雄.南京长江隧道超大断面管片衬砌结构相似模型试验与数值分析[D].成都:西南交通大学,2007.YANG Xiong.The similar model test and numerical analysis of the lining structure of the super large section of the Nanjing Yangtze River Tunnel[D].Chengdu:Southwest Jiaotong University,2007.
[3]毕湘利,柳献,王秀志,等.通缝拼装盾构隧道结构极限承载力的足尺试验研究[J].土木工程学报,2014,47(10):117-127.BI Xiangli,LIU Xian,WANG Xiuzhi,et al.Experimental investigation on the ultimate bearing capacity of continuous-jointed segmental tunnel linings[J].China Civil Engineering Journal,2014,47(10):117-127.
[4]朱合华,黄伯麒,李晓军,等.盾构衬砌管片接头内力变形统一模型及试验分析[J].岩土工程学报,2014,36(12):2153-2160.ZHU Hehua,HUANG Bolin,LI Xiaojun,et al.Unified model for internal force and deformation of shield segment joints and experimental analysis[J].Chinese Journal of Geotechnical Engineering,2014,36(12):2153-2160.
[5]梁英俊.土层侧压力系数试验测定及其对盾构管片内力的影响分析[D].北京:北京交通大学,2011.LIANG Yingjun.Test of lateral pressure coefficient of soil layer and its influence on internal force of shield segment[D].Beijing:Beijing Jiaotong University,2011.
[6]宋锦虎,缪林昌,徐政,等.浅埋并行隧道间距对管片内力影响的分析[J].工业建筑,2012,42(1):110-116,84.SONG Jinhu,MIAO Linchang,XU Zheng,et al.Impact analysis of twin-tunnels apace on internal force in lining[J].Industrial Building,2012,42(1):110-116,84.
[7]丁军霞,冯卫星,杜学玲.盾构隧道管片衬砌内力及变形的影响因素分析[J].石家庄铁道学院学报,2004(3):75-79.DING Junxia,FENG Weixing,DU Xueling.Analysis of influence factors on internal force and deformation of shield tunnel lining[J].Journal of Shijiazhuang Railway Institute,2004(3):75-79.
[8]艾辉军.基于三维非连续接触模型的管片与接头结构力学特性研究[D].长沙:中南大学,2014.AI Huijun.Study on mechanical properties of tube and joint structure based on three dimensional discontinuous Ashimo H,Ishimura T,Evaluation of the load on shield tunnel lining in grave[J].Changsha;Central South University,2014.
[9]Chungsik Yoo.Ground settlement during tunneling in groundwater drawdown environment-Influencing factors[J].Underground Space,2016,1(1):20-29.
[10]张鹏.地铁盾构隧道管片接头的理论分析及应用研究[D].北京:北京交通大学,2011.ZHANG Peng.Theoretical analysis and application research on the segment joint of metro shield tunnel[D].Beijing:Beijing Jiaotong University,2011.
[11]Hornik,K,Stinchcombe M,White H.Multilayer feedforward ntworks are universal approximator[J].Neural Networks,1989,2(5):359-366.
[12]Garson G D.Interpreting neural-network connection weights[J].AI Expert,1991,6(7):47-51.
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