基于反分析法的基坑开挖引起的土体位移分析

木林隆; 黄茂松; 吴世明

基于反分析法的基坑开挖引起的土体位移分析 English Version

(1. 同济大学岩土与地下工程教育部重点实验室，上海 200092；2. 同济大学地下建筑与工程系，上海 200092；3. 浙江浙大网新集团有限公司，浙江杭州 310030)

详细信息

作者简介:
木林隆(1984– )，男，浙江温州人，讲师，从事岩土与岩石力学研究。

中图分类号: TU476
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出版历程
- 收稿日期: 2012-11-12
- 发布日期: 2012-11-12

Soil responses induced by excavations based on inverse analysis

(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. Insigma group Co., Ltd., Hangzhou 310007, China)

摘要

摘要: 目前基坑开挖引起的土体自由场位移的计算方法主要为有限单元法，而要利用有限单元法较为准确的计算土体的位移场，除了对有限单元法理论以及土体本构知识有较为充足的储备外，模型参数的选取也是重要因素。室内试验确定模型参数受到诸多因素的影响，很多时候在利用这些参数预测基坑变形时并不准确。反分析方法可以有效的解决模型参数的选取问题，因此本文将基于实测数据，采用考虑土体小应变特性的HSS模型，利用反分析方法对基坑开挖引起的土体位移进行研究。研究表明考虑土体小应变采用反分析方法可以较为准确的计算基坑开挖引起的土体位移。
- 基坑开挖 /
- 反分析 /
- HSS模型 /
- 土体变形
Abstract: Evaluation of soil responses induced by excavations, which are now mainly computed by finite element method, is required to estimate the damages of potential buildings caused by excavations. Using proper soil parameters is a key ingredient when computing soil responses, assuming the model represents the actual soil responses in a reasonable way. The soil parameters are usually identified from laboratory experiments performed on tube samples or from in-situ tests, but large uncertainties are associated with these methods for most projects. The inverse analysis is a quantitative technique which allows one to select parameters to fit the responses of soil from field observations. The technique is applied to the results of field performance data collected from an excavation made through Chicago clays. The results of the computed soil responses based on the hardening soil model (HS) and hardening model-small (HSS) model found in the computer code PLAXIS are compared to illustrate the problems likely encountered in practical application of finite element simulations. Based on the well chosen parameters, the soil movements induced by the excavation are computed reasonably.
- excavation /
- inverse analysis /
- HSS model /
- soil deformation

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参考文献(13)

[1]	MANA A L, CLOUGH G W. Prediction of movement for braced cuts in clay[J]. J of Geotech, Div, ASCE, 1981, 107(GT6).
[2]	CLOUGH G W, O’ROURKE T D. Construction induced movements of in situ walls[C]// Proc Desigh and Performance of Earth Retaining Structure, Geotechnical Special Publication No. 25, ASCE, NEW YORK: 439–470.
[3]	KUNG G T C, JUANG C H, HSIAO E C L, et al. Simplified model for wall deflection and ground-surface settlement caused by braced excavation in clay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133(6): 731–747.
[4]	PECK R B. Deep excavations and tunneling in soft ground[C]// Proc7th ICSMFE, Mexico, 1969: 225–290.
[5]	BLACKBURN J T, FINNO R J. Three-Dimensional responses observed in an internally braced excavation in soft clay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133(11): 1364–1373.
[6]	WANG J H, XU Z H, WANG W D. Wall and ground movements due to deep excavations in Shanghai soft soils[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2010, 136(7): 985–994.
[7]	BURLAND J B. Ninth Laurits Bjerrum Memorial lecture: “Small is beautiful”-the stiffness of soils at small strain[J]. Can Geotech, 1989, 26: 499–516.
[8]	WHITTLE A J, HASHASH Y M A, WHITMAN R V. Analysis of deep excavation in Boston[J]. J Geotech Eng, 1993, 119(1): 69–90.
[9]	KUNG G T C, HSIAO E C L, JUANG C H. Evaluation of a simplified small-strain soil model for analysis of excavation-induced movements[J]. Canadian Geotechnical Journal, 2007, 44(6): 726–736.
[10]	CLAYTON C R I. Stiffness at small strain: research and practice[J]. Géotechnique, 2011, 61(1): 5–37.
[11]	CALVELLO M. Inverse analysis of supported excavations through Chicago glacial clays[D]. Northwestern University, 2002.
[12]	FINNO R J, CALVELLO M. Supported excavations: observational method and inverse modeling[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2005, 131(7): 826–836.
[13]	HASHASH Y M A, SONG H, OSOULI A. Three- dimensional inverse analyses of a deep excavation in Chicago clays[J]. International Journal for Numerical and Analytical Method in Geomechnics, 2011, 35: 1059–1075.