DOI:
10.11908/j.issn.0253-374x.19455 作者:
作者单位: 同济大学 土木工程学院，上海200092
作者简介: 高彦斌（1973—)，男，副教授，博士生导师，工学博士，主要研究方向为软黏土力学特性与软土工程。E-mail: yanbin_gao@tongji.edu.cn
通讯作者:
中图分类号: TU471
基金项目: 国家自然科学基金（41972273）
Total Strength of Saturated Clay and Earth Pressure in Excavation by Total Stress Analysis Method
Author:
Affiliation: College of Civil Engineering, Tongji University, Shanghai 200092, China
Fund Project:
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摘要:回顾了饱和黏性土总强度S
u的概念以及“φ=0法”的基本原理，指出直接将三轴固结不排水强度指标c
cu、φ
cu 和直剪固结快剪强度指标c
cq、φ
cq代入朗肯土压力公式是一种错误的分析方法，由此导致了对水土合算土压力分析方法的误解。根据两种试验的原理，推导出了采用强度指标c
cu、φ
cu 和c
cq、φ
cq表示的总强度S
u，进而依据“φ=0法”，给出了基坑开挖卸载下正确的水土合算土压力公式。结合该公式，对行业规范中采用的一些土压力计算方法进行了评述，并结合算例结果对计算分析中几种强度指标的应用进行了评价。
Abstract:Based on the review of the concept of total strength S
u and the principle of “
method”, it is pointed out that directly substituting the strength parameters of c
cu and φ
cu by triaxial consolidated undrained shear test, and the strength parameters of c
cq and φ
cq by direct shear test into Rankine’s earth pressure is a uncorrected analysis method. It results in the misleading of the application of the total stress analysis method. According to the principle of the two kinds of test, the formulations of total strength S
u using the strength parameters of c
cu,φ
cu, and c
cq,φ
cq are derived. Then, according to the principle of “
method”, correct earth pressure equations applied to unloading condition in excavation are presented. Based on the new equations, the analysis methods given in several domestic standards or specifications are discussed. Finally, different kinds of strength parameters in earth pressure analysis are evaluated with analysis examples.
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