场地和断层对埋地管道破坏的影响分析
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摘要
场地条件和断层活动是埋地管道破坏的主要原因,避免因为场地岩土和断层的影响而造成管道破坏,是城市地下生命线工程建设中急需解决的问题。采用ADINA软件的Parasolid建模方式,通过定义合适的体类型和布尔操作,建立了埋地管道破坏分析的几何模型,实现了土体-断层-管道破坏有限元建模。借助模型参数选择,确定了基岩与岩土性质、管道特性等模型参数;定义了管-土摩擦和约束条件、地震波和断层位移荷载等。依据计算结果,分析了场地条件和断层参数对地下管道地震破坏的影响;结果表明:管道埋藏越深,断层断距越大,管道的变形越大,破坏越严重。给出了管-土摩擦系数和断层与管道交角的最优值,并给出了几点工程建议。
Site condition and fault movement are the main reasons of buried pipeline’s damage.It is the main problem of earthquake lifeline engineering to avoid the damage of buried pipelines affected by site condition and faults under earthquake load.By the parasolid modeling in ADINA,through the definition of site body and Boolean operation,the geometry model is established for the analysis of buried pipeline damage,and finite element modeling of soil-fault-pipe is worked out.With model preferences,parameters of the model are defined,such as the characteristics of rock and soil,characteristics of pipeline.Pipe-soil friction and fixity are applied,and loads of earthquake wave and fault displacement are defined.According to the calculating results,influence of some parameters on the damage of buried pipeline under earthquake load are investigated,such as buried depth,parameters of faults,and pipe-soil friction.The deeper of burying and the bigger of fault throw,the easier of pipe deformation and damage.Optimum volume of pipe-soil friction coefficient and cut angle between fault and pipeline are obtained.Finally,some advices are proposed for the protection of buried pipelines in engineering.
Site condition and fault movement are the main reasons of buried pipeline’s damage.It is the main problem of earthquake lifeline engineering to avoid the damage of buried pipelines affected by site condition and faults under earthquake load.By the parasolid modeling in ADINA,through the definition of site body and Boolean operation,the geometry model is established for the analysis of buried pipeline damage,and finite element modeling of soil-fault-pipe is worked out.With model preferences,parameters of the model are defined,such as the characteristics of rock and soil,characteristics of pipeline.Pipe-soil friction and fixity are applied,and loads of earthquake wave and fault displacement are defined.According to the calculating results,influence of some parameters on the damage of buried pipeline under earthquake load are investigated,such as buried depth,parameters of faults,and pipe-soil friction.The deeper of burying and the bigger of fault throw,the easier of pipe deformation and damage.Optimum volume of pipe-soil friction coefficient and cut angle between fault and pipeline are obtained.Finally,some advices are proposed for the protection of buried pipelines in engineering.
引文
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[12]朱庆杰,刘英利,蒋录珍,等.管-土摩擦和管径对埋地管道破坏的影响[J].地震工程与工程振动,2006,26(3):197-199.ZHU Qing-jie,LIU Ying-li,JIANG Lu-zhen,et al.Analysis of butied pipeline damage affected by pipe-soil friction and pipe radius[J].Earthquake Engineering and Engineering Vibration,2006,26(3):197-199.
[2]孙绍平,韩阳.生命线地震工程研究述评[J].土木工程学报,2003,36(5):97-104.SUN Shao-ping,HAN Yang.State-of-the-art of the research on lifeline earthquake engineering[J].China Civil Engineering Journal,2003,36(5):97-104.
[3]赵林,冯启民.埋地管线有限元建模方法研究[J].地震工程与工程振动,2001,21(2):53-57.ZHAO Lin,FENG Qi-min.Research on methods for establishing FEM model of buried pipeline[J].Earthquake Engineering and Engineering Vibration,2001,21(2):53-57.
[4]张云,殷宗泽.埋管隧道竖向地层压力的研究[J].岩土力学,2001,22(2):184-188.ZHANG Yun,YIN Zong-ze.Study of the vertical ground pressure of buried tunnel[J].Rock and Soil Mechanics,2001,22(2):184-188.
[5]刘爱文,张素灵,胡聿贤,等.地震断层作用下埋地管线的反应分析[J].地震工程与工程振动,2002,22(2):22-27.LIU Ai-wen,ZHANG Su-ling,HU Yu-xian,et al.A method for analyzing response of buried pipeline due to earthquake fault movement[J].Earthquake Engineering and Engineering Vibration,2002,22(2):22-27.
[6]刘全林,杨敏.地埋管与土相互作用分析模型及其参数确定[J].岩土力学,2004,25(5):728-731.LIU Quan-lin,YANG Min.Analytical model and parameters determination of interaction between buried pipe and soil[J].Rock and Soil Mechanics,2004,25(5):728-731.
[7]刘全林,陈希鲜,王宝泉.地埋非圆形管道与土相互作用的分析计算[J].岩土力学,2005,26(11):1 717-1 721.LIU Quan-lin,CHEN Xi-xian,WANG Bao-quan.Analytical calculation of interaction between box-shaped and egg-shaped buried culverts and soil[J].Rock and Soil Mechanics,2005,26(11):1 717-1 721.
[8]胡志平,罗丽娟,蔡志勇.盾构隧道管片衬砌的平板壳-弹性铰-地基系统模型[J].岩土力学,2005,26(9):1 403-1 408.HU Zhi-ping,LUO Li-juan,CAI Zhi-yong.Study of flat shell-elastic hinge-foundation model in shield tunnel[J].Rock and Soil Mechanics,2005,26(9):1 403-1 408.
[9]余振翼,魏纲.顶管施工对相邻平行地下管线位移影响因素分析[J].岩土力学,2004,25(3):441-445.YU Zhen-yi,WEI Gang.Factors analysis of parallel underground pipelines displacements affected by pipe jacking[J].Rock and Soil Mechanics,2004,25(3):441-445.
[10]吴波,高波,索晓明,等.城市地铁隧道施工对管线的影响研究[J].岩土力学,2004,25(4):657-662.WU Bo,GAO Bo,SUO Xiao-ming,et al.Study of influence of metro tunnel excavation on buried pipelines[J].Rock and Soil Mechanics,2004,25(4):657-662.
[11]蒋录珍,朱庆杰.跨断层地下管道破坏的数值模拟[J].福州大学学报(自然科学版),2005,33(Supp.):321-324.JIANG Lu-zhen,ZHU Qing-jie.Numerical simulation of underground pipes’damage crossing fault[J].Journal of Fuzhou University(Natural Science),2005,33(Supp.):321-324.
[12]朱庆杰,刘英利,蒋录珍,等.管-土摩擦和管径对埋地管道破坏的影响[J].地震工程与工程振动,2006,26(3):197-199.ZHU Qing-jie,LIU Ying-li,JIANG Lu-zhen,et al.Analysis of butied pipeline damage affected by pipe-soil friction and pipe radius[J].Earthquake Engineering and Engineering Vibration,2006,26(3):197-199.
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