淤泥质黏土卸荷应力路径本构模型研究  

CONSTITUTIVE MODEL OF UNLOADING STRESS PATH OF SILTY CLAY

作　　者：胡家亮 周乐琳 HU Jialiang;ZHOU Lelin(School of Transportation and Civil Engineering,Foshan University,Foshan 528225,Guangdong,China)

机构地区：[1]佛山科学技术学院交通与土木建筑学院,广东佛山528225

出　　处：《力学与实践》2020年第6期740-751,共12页Mechanics in Engineering

摘　　要：本文针对佛山地铁3号线桂城站基坑中淤泥质黏土进行了不同应力路径固结不排水剪切试验研究,分别为减围压三轴压缩试验、轴向减载三轴伸长试验和三轴伸长试验。通过分析佛山地区软黏土在不同应力路径下的力学特性以及引入归一化因子,建立了佛山地区软黏土卸荷应力路径本构模型,为佛山地区淤泥质土层的基坑开挖提供了理论参考及设计依据。In this paper,for the silty clay in the foundation pit of Guicheng Station of Foshan Metro Line 3,different stress path consolidation undrained shear tests,the reduced triaxial compression test,reduced triaxial extension test,and triaxial extension test are carried out,respectively.By analyzing the mechanical properties of the soft clay under different stress paths in Foshan area and introducing normalization factors,a constitutive model for the stress path of the soft clay unloading in Foshan area is established,which can be used for the excavation of the foundation pits in silty soil in Foshan area.

关 键 词：淤泥质黏土 卸荷应力路径 三轴固结不排水试验 归一化因子 本构模型 

分 类 号：TU411.3[建筑科学—岩土工程]