岩土工程学报Issue(5)：769-775,7.DOI:10.11779/CJGE201505001
软黏土中某内支撑式深基坑稳定性安全系数分析
Factor of safety of a braced deep excavation in soft clay
摘要
Abstract
The factor of safety (FS) is a very important design index for deep excavation in soft clay. The existing methods for FS mainly include the conventional methods and finite element method (FEM) based on the reduced shear strength technique. In this study, the conventional methods and reduced shear strength FEM are used forFS evaluation of a failed deep excavation in soft clay. By comparing the values ofFS of the excavation using different soil strength parameters and methods, the applicability of the analysis methods and soil strength parameters is evaluated. The research results indicate that the values of FS of the excavation calculated by the conventional methods and the reduced shear strength FEM using the total stress indexes, i.e.,su,ϕ=0, are very close to 1.0 and those from Terzaghi’s method, while the values ofFS of the excavation are much greater than 1.0 using the soil strength parametersc andϕ from triaxial tests. When the reduced shear strength FEM is applied forFS evaluation, the values ofFS obtained from the convergence criterion method are much greater than those from the intersection method. The values ofFS of the excavations using the intersection method and Terzaghi’s method are both very close to 1.0, which is consistent with the limited equilibrium state of the excavations at failure.关键词
软黏土/深基坑开挖/稳定性安全系数/有限元法/强度折减法Key words
soft clay/deep excavation/factor of safety/finite element method/reduced shear strength technique分类
建筑与水利引用本文复制引用
李忠超,陈仁朋,陈云敏,饶猛..软黏土中某内支撑式深基坑稳定性安全系数分析[J].岩土工程学报,2015,(5):769-775,7.基金项目
国家自然科学基金项目 （）
