深基坑变形特性的离心模型试验、数值计算与现场实测对比分析  

Comparison of Deformation Behavior of Deep Excavation among Centrifuge Model Test,Numerical Analysis and In-situ Monitoring

作　　者：梁发云[1,2] 褚峰[1,2] 宋著[1,2] 李永盛[1,2] 

机构地区：[1]同济大学岩土及地下工程教育部重点试验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《长江科学院院报》2012年第1期74-78,共5页Journal of Changjiang River Scientific Research Institute

基　　金：上海市科技攻关计划项目资助(09231200900)

摘　　要：依据背景工程特点进行抽象简化,得到合适的离心模型试验方案,采用离心模型试验分析紧邻地铁枢纽深基坑工程变形特性。同时建立三维有限元模型对上海地区某紧邻地铁超深基坑变形特性进行数值模拟,分析中土体本构关系采用考虑土体小应变特性的HSS模型进行描述,并与现场实测结果进行对比分析。研究表明:模型试验、理论计算及现场实测3种方法所得出的深基坑变形特性定性规律基本一致,但在量值上有较大的差别,其中采用考虑土体小应变特性的HSS模型能够较好地模拟超深基坑的变形特性。A metro in Sh suitable centrifuge model is anghai. Deformations of the buih by simplifying the deep foundation pit excavation project near the deep excavation project adjacent to the metro tunnels are investigated through centrifuge model test, and is meanwhile simulated by 3 D finite element numerical simulation, in which the constitutive relationship of soils are described with the HSS model which is based on small-strain stiffness. The re- sults are compared with those of the in-situ monitoring data. It is found that results of the three methods are consist- ent in qualitative rules but still differ greatly in the quantity, and the 3D numerical simulation using HSS model could better simulate the deformation of deep foundation pit, especially the deformation of diaphragm walls.

关 键 词：深基坑 变形特性 离心模型试验 三维有限元 现场实测 

分 类 号：TU473.2[建筑科学—结构工程]