深基坑整体稳定性分析中的孔隙水压力问题
摘要:在深基坑开挖整体稳定性分析中,把孔隙水压力的计算分解成静水压力、动水压力和超静水压力三个部分。对于静水压力,指出了目前工程中简化计算方法所存在的问题,建议按渗流流网的水头梯度进行计算。对于基坑开挖卸载所引起的超静水压力,应根据坑内外土体的应力路径做三轴不排水剪试验确定。此外,对于基坑开挖采用总应力法分析时,应按卸载总应力强度指标计算。
Abstract:In the stability analysis of deep excavation, the ground water pressure is divided into three parts,i. e.,hydrostatic pressure,seepage pressure and excessive pore water pressure. For the calculation of hydrostatic pressure,the errors of currently simplified methods used in practical engineering are pointed out,and a new method based on seepage analysis is proposed. The excessive pore water pressure induced by excavation should be determined by the undrained triaxial compression test according to the stress path of the soil in and out of foundation pit. Furthermore,the unloading shear strength parameters should be applied when using total stress method to analyse excavation problems.
中文标题:
深基坑整体稳定性分析中的孔隙水压力问题
Pore Water Pressure in Stability Analysis of Deep Excavation
作者:
郭玉荣,邹银生,王贻荪
GUO Yu-rong,ZOU Yin-sheng,WANG Yi-sun
作者简介:郭玉荣,男,1970年生,湖南大学土木系结构工程专业博士研究生,主要研究边坡稳定分析和基坑开挖问题。
通讯地址:
湖南大学土木系, 长沙 410082
出版物:岩土工程技术
收稿日期:1998-03-23
网络出版日期:2021-07-07
关键词:稳定性,静水压力,动力压力,孔隙水压力,深基础
Key words:deep excavation,stability analysis,hydrostatic pressure,seepage pressure,excessive pore water pressure
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