含水率对中膨胀土力学性质的影响分析  

Influence of moisture content on mechanical properties of medium expansive soil

作　　者：王欢 杨立功 赵玉田 刘晓强 WANG Huan;YANG Li-gong;ZHAO Yu-tian;LIU Xiao-qiang(Tianjin Research Institute for Water Transport Engineering,Ministry of Transport,Tianjin 300456,China;Shanghai Communications Construction Contracting Co.Ltd.,Shanghai 200136,China)

机构地区：[1]交通运输部天津水运工程科学研究所,天津300456 [2]上海交通建设总承包有限公司,上海200136

出　　处：《水道港口》2023年第3期466-472,486,共8页Journal of Waterway and Harbor

基　　金：国家自然科学基金项目(51979132);中央级公益性科研院所基本科研业务费项目(TKS20220102)。

摘　　要：以中膨胀土为研究对象,首先测定不同初始条件下后续含水率与膨胀率的关系曲线,根据后续含水率与膨胀率关系,研究一定初始含水率、干密度状态下土体膨胀过程中各状态力学性质的变化。不同初始条件下,膨胀土膨胀率与含水率呈近似线性关系,随着初始含水率增加,土体膨胀率与含水率线性关系的斜率降低,随着干密度增加,膨胀土膨胀率与含水率线性关系的斜率增加;随着含水量增加,膨胀土干密度增加,压缩模量、黏聚力及内摩擦角减小,压缩系数、膨胀力增加。随着初始含水率增加,膨胀土初始强度降低,随初始干密度增加,膨胀土初始强度增加。通过室内试验分析膨胀土各力学性质变化,为工程项目现场施工提供参考。The research object of this paper is medium expansive soil,according to the relationship between moisture content and expansion rate,the change of mechanical properties of soil in the process of expansion under certain initial moisture content and dry density is determined.Under different initial conditions,the expansion rate of expansive soil is approximately linear with moisture content,with the increase of initial moisture content,the slope of linear relationship between soil swelling rate and moisture content decreases,with the increase of dry density,the slope of linear relationship between swelling rate and moisture content of expansive soil increases;with the increase of moisture content,the density of expansive soil increases,the compressive modulus,cohesion and internal friction angle decrease,the compressibility and expansion force increases.With the increase of the initial moisture content,the initial strength of expansive soil decreases,with the increase of the initial dry density,the initial strength of expansive soil increases.The changes of mechanical properties of expansive soil are analyzed through laboratory tests,it provides a reference for the on-site construction of the project.

关 键 词：中膨胀土 含水率 力学性质 

分 类 号：TU435[建筑科学—岩土工程] TV16[建筑科学—土工工程]