上海世博会地下变电站基坑围护结构的动力反应分析
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摘要
采用三维快速拉格朗日程序FLAC3D,对上海世博会500 kV地下变电站围护结构的动力反应问题进行了深入细致的分析和研究。所建立的模型采用摩尔-库伦本构关系,同时考虑了静力、动力以及地下承压水的影响,并且通过FLAC3D软件的二次开发功能引入统一强度理论,来判别围护结构中钢筋混凝土的应力状态,力求更真实地反映围护结构在动力作用下的响应状态。分析结果表明,圆型围护结构的环向刚度比较大,受力时将大部分侧向荷载转移给其环向拱结构,从而使得基坑和周围土体无论在静力状态还是动力状态下,整体变形均较小;基坑整体在所研究的各种工况下,围护结构都处于安全状态。
A three-dimensional fast Lagrangian program FLAC3D is adopted to conducted the detailed study on the dynamic responses of encloure structure in a 500 kV underground substation of the Shanghai World Expo.The Mohr-Coulomb model is used and static analysis,dynamic analysis and artesian water influence are included in this research.The unified strength theory is introduced to the model by secondary development in FLAC3D to determine the stress state of the envelope′s reinforced concrete for truly reflecting the responses of the envelope under the action of the dynamic force.The results show that the ring stiffness of the cylindrical enclosure structure is large.When it is forced,most of the lateral loads will be transferred to the arch structure in the ring direction,which controls the deformation of the pit and the surrounding soil in both static and dynamic conditions.The excavation as a whole is in a safe state in a variety of operating conditions.
A three-dimensional fast Lagrangian program FLAC3D is adopted to conducted the detailed study on the dynamic responses of encloure structure in a 500 kV underground substation of the Shanghai World Expo.The Mohr-Coulomb model is used and static analysis,dynamic analysis and artesian water influence are included in this research.The unified strength theory is introduced to the model by secondary development in FLAC3D to determine the stress state of the envelope′s reinforced concrete for truly reflecting the responses of the envelope under the action of the dynamic force.The results show that the ring stiffness of the cylindrical enclosure structure is large.When it is forced,most of the lateral loads will be transferred to the arch structure in the ring direction,which controls the deformation of the pit and the surrounding soil in both static and dynamic conditions.The excavation as a whole is in a safe state in a variety of operating conditions.
引文
[1]梅松华,李文秀,盛谦.FLAC在岩土工程参数反演中的应用[J].矿冶工程,2000,20(4):23-26.Mei S H,Li W X,Sheng Q.Application of FLAC inback analysis of geotechnical parameters[J].Miningand Metallurgical Engineering,2000,20(4):23-26.
[2]Cundall P A,Board M A.Microcomputer programfor modeling large-strain plasticity problems,in nu-merical methods in geomechanics[C]∥Proceedings ofthe Sixth International Conference On NumericalMethods in Geomechanics,Innsbruck,Rotterdam,Balkema:Numerical Methods in Geomechanics,1998.2101-2108.
[3]刘继国,曾亚武.FLAC3D在深基坑开挖与支护数值模拟中的应用[J].岩土力学,2006,27(3):505-508.Liu J G,Zeng Y W.Application of FLAC3Dto simula-tion of foundation excavation and support[J].Rockand Soil Mechanics,2006,27(3):505-508.
[4]庄海洋,程绍革,陈国兴.阪神地震中大开地铁车站震害机制数值仿真分析[J].岩土力学,2008,29(1):245-250.Zhuang H Y,Cheng S G,Chen G X.Numerical sim-ulation and analysis of earthquake damages of Dakaimetro station caused by Kobe earthquake[J].Rockand Soil Mechanics,2008,29(1):245-250.
[5]Ou C Y,Hsien P G,Chiou D C.Characteristics ofground surface settlement during excavation[J].Canadian Geotechnical Journal,1993,30(5):758.
[6]俞茂宏.岩土类材料的统一强度理论及其应用[J].岩土工程学报,1994,16(2):1-10.Yu M H.Unified Strength Theory for geomaterialsand its applications[J].Chinese Journal of Geotechni-cal Engineering,1994,16(2):1-10.
[7]钱向东.混凝土拱坝的强度计算与极限荷载分析[D].南京:河海大学,2005.Qian X D.Strength and limit load analysis of concretearch dams[D].Nanjing:Hohai University,2005.
[8]Yu M H.Unified Strength Theory and Its Applica-tions[M].Berlin:Springer,2004.
[9]GB 50010-2002,混凝土结构设计规范[S].
[10]俞茂宏.混凝土强度理论及其应用[M].北京:高等教育出版社,2002.Yu M H.Concrete Strength Theory and Its Applica-tions[M].Beijing:Higher Education Press,2002.
[11]刘建航,侯学渊.基坑工程手册[M].北京:中国建筑工业出版社,1997.Liu J H,Hou X Y.Manual of Foundation Pit[M].Beijing:China Architecture&Buliding Press,1997.
[2]Cundall P A,Board M A.Microcomputer programfor modeling large-strain plasticity problems,in nu-merical methods in geomechanics[C]∥Proceedings ofthe Sixth International Conference On NumericalMethods in Geomechanics,Innsbruck,Rotterdam,Balkema:Numerical Methods in Geomechanics,1998.2101-2108.
[3]刘继国,曾亚武.FLAC3D在深基坑开挖与支护数值模拟中的应用[J].岩土力学,2006,27(3):505-508.Liu J G,Zeng Y W.Application of FLAC3Dto simula-tion of foundation excavation and support[J].Rockand Soil Mechanics,2006,27(3):505-508.
[4]庄海洋,程绍革,陈国兴.阪神地震中大开地铁车站震害机制数值仿真分析[J].岩土力学,2008,29(1):245-250.Zhuang H Y,Cheng S G,Chen G X.Numerical sim-ulation and analysis of earthquake damages of Dakaimetro station caused by Kobe earthquake[J].Rockand Soil Mechanics,2008,29(1):245-250.
[5]Ou C Y,Hsien P G,Chiou D C.Characteristics ofground surface settlement during excavation[J].Canadian Geotechnical Journal,1993,30(5):758.
[6]俞茂宏.岩土类材料的统一强度理论及其应用[J].岩土工程学报,1994,16(2):1-10.Yu M H.Unified Strength Theory for geomaterialsand its applications[J].Chinese Journal of Geotechni-cal Engineering,1994,16(2):1-10.
[7]钱向东.混凝土拱坝的强度计算与极限荷载分析[D].南京:河海大学,2005.Qian X D.Strength and limit load analysis of concretearch dams[D].Nanjing:Hohai University,2005.
[8]Yu M H.Unified Strength Theory and Its Applica-tions[M].Berlin:Springer,2004.
[9]GB 50010-2002,混凝土结构设计规范[S].
[10]俞茂宏.混凝土强度理论及其应用[M].北京:高等教育出版社,2002.Yu M H.Concrete Strength Theory and Its Applica-tions[M].Beijing:Higher Education Press,2002.
[11]刘建航,侯学渊.基坑工程手册[M].北京:中国建筑工业出版社,1997.Liu J H,Hou X Y.Manual of Foundation Pit[M].Beijing:China Architecture&Buliding Press,1997.
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