非饱和土理论在降水深基坑支护工程中的应用研究  

Application of Unsaturated Soil Theory in Deep Foundation Pit Supporting Engineering

作　　者：张维东 郭淞 徐立强 Zhang Weidong;Guo Song;Xu Liqiang(Beijing General Municipal Engineering Design&Research Institute Co.,Ltd.,Beijing,China;School of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen,China)

机构地区：[1]北京市市政工程设计研究总院有限公司,北京 [2]哈尔滨工业大学(深圳)土木与环境工程学院,广东深圳

出　　处：《科学技术创新》2025年第4期173-176,共4页Scientific and Technological Innovation

摘　　要：本文在研究非饱和土土体时,着重考虑分析净应力(σ-ua)、基底吸力(ua-uw)对土体抗剪强度的影响;通过引入俞茂宏学者的双剪统一强度理论,克服了Bishop等忽略中间主应力σ2对非饱和土体抗剪强度的影响效应的缺陷,并基于基底吸力(ua-uw)均匀分布的情况下,对非饱和土土体在空隙气压ua、空隙水压uw、外荷载q等作用下对其土压力公式、抗倾覆嵌固深度方程进行推导研究,其一系列公式是在全面考虑到非饱和土土体力学性质所得,对类似的含有非饱和土体的深基坑存在一定的工程借鉴意义。In the study of unsaturated soils,this paper focuses on the analysis of the effects of net stress(σ-ua)and basal suction(ua-uw)on the shear strength of soil.By introducing Yu Maohong's double shear unified strength theory,Bishop et al.overcome the intermediate principal stressσ2to unsaturated.Defects in the effect of soil shear strength(ua-uw),and based on the uniform distribution of the basal suction the earth pressure formula and anti-overlaying of the unsaturated soil under the action of void pressure ua,void water pressure uw and external load q.The depth equation and the surface settlement formula are pushed into the study.The series of formulas are obtained from the comprehensive consideration of the mechanical properties of unsaturated soils.There are certain deep foundation pits and slope retaining wall supports with unsaturated soils.The engineering reference significance.

关 键 词：非饱和土 基底吸力 双剪统一强度理论 

分 类 号：TU432[建筑科学—岩土工程]