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     張  武¹，管  飛^2,3，劉  瑞¹
    （1 江蘇中茵置業(yè)有限公司，昆山215300; 2 同濟(jì)大學(xué)建筑設(shè)計(jì)研究院，上海200092; 3 同濟(jì)大學(xué)地下建筑與工程系，上海200092）

[摘要] 采用HS土體本構(gòu)模型，使用有限元方法，以昆山某廣場(chǎng)軟土深大基坑為例，對(duì)圍護(hù)樁剛度、支撐剛度和坑內(nèi)加固對(duì)圍護(hù)樁最大水平位移的影響進(jìn)行了2D分析。分析表明，圍護(hù)樁剛度和支撐剛度的增大對(duì)圍護(hù)樁水平變形的改善逐漸降低；而坑內(nèi)加固的寬度、深度和剛度的增加對(duì)圍護(hù)樁最大水平位移的改善呈線性增加，但幅度不大。因此，圍護(hù)結(jié)構(gòu)的設(shè)計(jì)存在優(yōu)化的必要和可能。
[關(guān)鍵詞] 軟土；深大基坑；數(shù)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