长江科学院院报 ›› 2012, Vol. 29 ›› Issue (1): 69-73.

• 全国土工离心模拟技术学术交流会专栏 • 上一篇    下一篇

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

梁发云a, b，褚峰a, b，宋著a, b，李永盛a, b   

  1.  同济大学 a.岩土及地下工程教育部重点试验室；b.地下建筑与工程系，上海200092
  • 收稿日期:2011-10-21 出版日期:2012-01-01 发布日期:2012-01-10
  • 作者简介:梁发云(1976-)，男，安徽肥东人，副教授，博士生导师，主要从事桩基础、深基坑工程等方面的研究，
  • 基金资助:

    上海市科技攻关计划项目资助(09231200900)

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

LIANG Fa-yun1, 2, CHU Feng 1,2 , SONG Zhu 1, 2, LI Yong-sheng 1, 2   

  1. 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University, Shanghai200092, China; 2. Department of Geotechnical Engineering,Tongji University, Shanghai200092, China
  • Received:2011-10-21 Online:2012-01-01 Published:2012-01-10

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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。

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

Abstract: A suitable centrifuge model is built by simplifying the deep foundation pit excavation project near the metro in Shanghai. Deformations of the deep excavation project adjacent to the metro tunnels are investigated through centrifuge model test, and is meanwhile simulated by 3D 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 results are compared with those of the in-situ monitoring data. It is found that results of the three methods are consistent 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.

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