软土地区基坑开挖工程中围护结构及土体位移的三维有限元分析  

Three-dimensional Finite Element Analysis on Displacement of Retaining Structure and Soil in Foundation Pit Excavation Engineering in Soft Deposits

作　　者：任云 

机构地区：[1]上海祥测土木工程技术有限公司,上海200072

出　　处：《工程质量》2017年第5期9-14,共6页Construction Quality

摘　　要：水泥土挡墙因具有无振动、无噪音、污染小,止水效果较好和低成本等优点,成为开挖深度<7 m的软土基坑中所被泛采用的支护形式。但其目前的设计仍参照传统重力式挡墙的设计模式,主要考虑墙体的强度和稳定性,变形估算目前还没有合适的方法。在我国长江中下游和东南沿海一带软土地区基坑中,水泥土挡墙的侧向位移往往过大,严重影响基坑周围的环境安全。论文结合某中学新建科技楼基坑支护项目,着眼于理论和实践中迫切需要解决的问题,运用ABAQUS对水泥土挡墙在基坑开挖条件下的工作性状进行有限元法分析,得出了水泥土挡墙侧向位移及基坑周围地表沉降的变化分布规律。Cement-soil retaining wall is one type of the pit support structures. Thanks to its free- vibration, zero noise, little pollution, good water retaining effect and low cost, it has been widely used in the soft soil foundation pit whose digging depth is lower than 7m. The current designing still takes the designing model of traditional gravity retaining wall as the reference, mainly considering the strength and stability of the retaining wall. There is temporarily no appropriate method for the calculation of deformation. In the soft soil foundation pit along the middle and lower reaches of Yangtze River and southeast coast of China, the deformation of cement-soil retaining wall is usually big. Such deformation would seriously affect the safety of surrounding environment of the pit. This paper carried out an all-round designing on the underground diaphragm wall from aspects of the model selection and design of the support structure, pit stability analysis and the calculation of the internal force of the support structure. Meanwhile, this paper focused on urgent issues which need to be handled in theories and practices. Based on the actual example of a pit project, it used finite element method to analyze the working properties of cement-soil retaining wall under the digging conditions of the pit by ABAQUS, and thus found the changing principles of the lateral displacement of the wall, upheaval of pit bottom and ground surface subsidence.

关 键 词：水泥土挡墙 基坑 ABAQUS 有限元 侧向位移 

分 类 号：TU411[建筑科学—岩土工程]