上海世博会地下变电站基坑围护结构的动力反应分析  

Analysis of Dynamic Responses of Enclosure Structure in an Underground Substation of Shanghai World Exposition

作　　者：丰土根[1,2] 杜冰[3] 王可佳[4] 李玉伟[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程科学研究所,南京210098 [3]中交第一公路勘察设计研究院有限公司,西安710075 [4]解放军理工大学防护建筑学教研室,南京210007

出　　处：《防灾减灾工程学报》2010年第4期361-368,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：教育部科学技术研究重点项目(109077);水利部公益性行业科研项目(200801014)资助

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 FLAC^3D is adopted to conducted the detailed study on the dynamic responses of eneloure 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 incl,uded in this research. The unified strength theory is introduced to the model by seeondary development in FLAC^3D 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 eonditions.

关 键 词：地下变电站 围护结构 动力反应分析 FLAC3D 统一强度理论 

分 类 号：O353.1[理学—流体力学] TU81[理学—力学]