宁波淤泥质黏土应力路径试验研究  

Experimental study on stress path of Ningbo soft clay

作　　者：张春进[1] 陈斌[1] 姚燕明[1] 

机构地区：[1]宁波市轨道交通工程建设指挥部,浙江宁波315010

出　　处：《工程勘察》2016年第1期5-11,共7页Geotechnical Investigation & Surveying

基　　金：宁波市科技计划项目(2013C50005)

摘　　要：在60k Pa、120k Pa和200k Pa围压下,开展了宁波淤泥质黏土增p、等p及减p应力路径试验,结果表明:不同应力路径对土的应力—应变特性影响不大,增p、等p及减p应力路径试验中土体应力—应变曲线均呈弱软化型;在减p应力路径试验中出现剪胀现象,孔压一直为负;不同应力路径对土体强度的影响不同,60k Pa和120k Pa围压下等p和减p应力路径下试样强度变化不大,200k Pa围压下等p工况下的强度大于减p工况下的值。The stress path tests are studied on soft clay in Ningbo area by increasing, maintain and decreasing pressure p at different confining pressures, i. e. 60kPa, 120kPa, 200kPa： The test results show that different stress paths have little effect on the stress-train characteristics on Ningbo silt clay; and the stress-train curves are a slightly softening type when increasing, keeping constantly and reducing pressure in the stress path tests. Pore water pressure is negative in the process of reducing p, mainly because the reducing prssure of stress path test appeared the phenomenon of shear dilatancy. The influence of different stress paths on the soil strength is different that when the confining pressures are 60kPa and 120kPa, the strength of samples change little at the constant and reducing pressure of stress paths; when the confining pressure is 200kPa, the strength at the constant pressure of stress path is greater than the strength at the reduced pressure of stress path.

关 键 词：淤泥质黏土 应力路径 应力—应变关系 强度 

分 类 号：TU411[建筑科学—岩土工程]