岩土力学Issue(5)：1413-1420,8.
基坑底分层回弹量的实用计算方法
A practical method for calculating layerwise rebound at the bottom of foundation pit
摘要
Abstract
Excavation of the pit will cause the rebound, the deeper the excavation is, the greater the rebound will be;the large amount of rebound will cause a variety of engineering problems. Existing rebound calculation methods require specialized rebound experiment or a particular stress path experiment to determine the unloading modulus. The application of modulus obtained from conventional laboratory tests and commonly used Mindlin solution and Boussinesq solution combined in a simple and practical way to get the rebound is studied in this paper. Four calculation methods for different combinations between the stress calculation of the Mindlin solution and Boussinesq solution and the deformation calculation of e-lg p model and Duncan-Chang model, are obtained;and then the amount of rebound is calculated by the application of the layerwise summation method; and the accuracies of four methods are explored respectively. A more practical method for the application of engineering excavation rebound calculation is obtained. Compared with the measured values, the Mindlin solution and e-lg p model are recommended respectively to calculate the stress and modulus;and then a calculated rebound which is very accurate to the measured values can be obtained with the application of the layerwise summation method.关键词
基坑回弹/分层总和法/Mindlin解/Boussinesq解/e-lgp模型/Duncan-Chang模型Key words
foundation pit rebound/layerwise summation method/Mindlin solution/Boussinesq solution/e-lgp model/Duncan-Chang model分类
建筑与水利引用本文复制引用
杨建民,李嘉..基坑底分层回弹量的实用计算方法[J].岩土力学,2014,(5):1413-1420,8.基金项目
国家自然科学基金（No.50908160）；教育部高校博士点新教师基金（No.20090032120051）；天津大学自主创新基金。 （）
