张  武¹，管  飞^2,3，刘  瑞¹
    （1 江苏中茵置业有限公司，昆山215300; 2 同济大学建筑设计研究院，上海200092; 3 同济大学地下建筑与工程系，上海200092）

[摘要] 采用HS土体本构模型，使用有限元方法，以昆山某广场软土深大基坑为例，对围护桩刚度、支撑刚度和坑内加固对围护桩最大水平位移的影响进行了2D分析。分析表明，围护桩刚度和支撑刚度的增大对围护桩水平变形的改善逐渐降低；而坑内加固的宽度、深度和刚度的增加对围护桩最大水平位移的改善呈线性增加，但幅度不大。因此，围护结构的设计存在优化的必要和可能。
[关键词] 软土；深大基坑；数值分析

Optimal design for large and deep excavation in soft ground based on FEM
Zhang Wu¹, Guan Fei ^2,3, Liu Rui¹
(1Jiangsu Zhongyin Estate Co., Ltd, Kunshan 215300, China; 2 The Architectrual Design & Research Institute of Tongji University, Shanghai 200092, China; 3 Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China)

Abstract: The 2D FEM analysis for a large and deep excavation in soft ground in Kunshan city is conducted. In this work, the influence of following factors on displacement of retaining piles is discussed: stiffness of retaining piles, stiffness of bracing struts and soil improvement in the special region. The results indicate that the optimal design based on above-mentioned FEM analysis is possible and necessary
Keywords: soft ground;  excavation;  FEM analysis