长大深基坑施工空间效应研究

›› 2010, Vol. 31 ›› Issue (5): 1579-1584.

长大深基坑施工空间效应研究

雷明锋，彭立敏，施成华，安永林

中南大学土木建筑学院，长沙 410075

收稿日期:2008-11-24 出版日期:2010-05-10 发布日期:2010-05-24
通讯作者: 施成华，男，1973年生，博士，副教授，主要从事隧道与地下工程方面的教学与科研工作。
作者简介:雷明锋，男，1983年生，博士研究生，主要从事隧道及地下工程结构理论研究与应用工作。

Research on construction spatial effects in large-long-deep foundation pit

LEI Ming-feng, PENG Li-min, SHI Cheng-hua, AN Yong-lin

School of Civil and Architectural Engineering, Central South University, Changsha 410075, China

Received:2008-11-24 Online:2010-05-10 Published:2010-05-24

摘要/Abstract

摘要：

针对目前长大深基坑施工空间效应的研究主要集中在数值模拟方面，理论研究尚不多见的现状，提出了黏性土条件下长大深基坑施工空间效应的简化计算方法。引入等代内摩擦角的概念，将基坑坑周土层等代为无黏性均质体，应用土的塑性上限理论及相关联流动法则，采用极限平衡分析法，对长大深基坑拉裂-剪切和纯剪切两种三维破坏模式下的空间效应进行了具体研究，给出了相应的空间效应系数计算公式，并进行了算例分析。研究结果表明，该方法避免了数值模拟的低效率、高费用、长周期的缺陷，可手算完成；计算成果能直接得出基坑坑壁空间效应系数的分布特征及量值大小，可用于指导基坑支护结构、施工方案的设计以及信息化监测测点布置和断面选择。

关键词: 长大深基坑, 空间效应, 简化计算, 塑性上限理论, 相关联流动法则, 等代内摩擦角, 极限平衡分析法

Abstract:

According to the research status of construction spatial effects in large-long-deep foundation pit that is mainly focusing on the numerical simulation, but theoretical research is not too many till now. A simplified method for calculating the construction spatial effects of large-long-deep foundation pit in cohesive soil was advanced. The soil layers around deep foundation pit were equal to cohesionless isotropic soil mass by introducing the concept of equivalent internal friction angle. And then, by means of limit equilibrium analysis method combined with soil plasticity upper bound theory and associated flow rule, the spatial effects of two 3D failure modes: tension crack-shear and pure shear in deep foundation pit were studied concretely; and the corresponding formulas of spatial effects coefficient were put forward; also two examples were analyzed. The research results indicate that the method, which can complete by hand-calculation, avoids the defects of low efficiency, high cost and long period in numerical simulation, and the distribution characteristics and value size of spatial effects coefficient could be obtained directly from its calculation results, which can be used as guidance for the supporting structure, construction scheme design and the test points or sections choice in process of information monitoring.

Key words: large-long-deep foundation pit, spatial effects, simplified calculation, soil plasticity upper bound theory, associated flow rule, equivalent internal friction angle, limit equilibrium analysis method

中图分类号:

U 455.55

雷明锋，彭立敏，施成华，安永林. 长大深基坑施工空间效应研究[J]. , 2010, 31(5): 1579-1584.

LEI Ming-feng, PENG Li-min, SHI Cheng-hua, AN Yong-lin. Research on construction spatial effects in large-long-deep foundation pit[J]. , 2010, 31(5): 1579-1584.

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