初始含水率与膨胀土力学特性关系的分析研究  

Analysis of the relationship of the initial moisture content of expansive soil mechanical characteristics

作　　者：蒋晓庆[1] 刘奇 汪东林[3] 

机构地区：[1]安徽广播电视大学开放教育学院,安徽合肥230022 [2]合肥市包河区淝河镇人民政府,安徽合肥230051 [3]安徽建筑大学,安徽合肥230022

出　　处：《安徽建筑工业学院学报（自然科学版）》2013年第3期36-38,共3页Journal of Anhui Institute of Architecture(Natural Science)

基　　金：安徽广播电视大学青年项目(qn13-20);安徽省教育厅自然科学研究项目(KJ2013B092);安徽省自然科学青年基金(1308085QE85)

摘　　要：通过室内试验模拟现场施工条件,采用干法重型击实试验,制备7组不同初始含水率的土样,分析膨胀力、膨胀率、终止吸水率随着初始含水率的不同而呈现的变化趋势;利用Origin7.5数值软件,进一步对膨胀力与初始含水率、膨胀率与初始含水率、终止吸水率与初始含水率进行线性拟合和S曲线拟合。数据结果证明:随着初始含水率的增加,膨胀力、膨胀率及终止吸水率呈现降低趋势;该区域膨胀土在吸水率达到5%左右时,土体可达到胀限含水率,促使土体膨胀稳定;三者的S曲线拟合均优于线性拟合结果,在S曲线拟合中,通过对Chi^/DoF值和R2值的综合考虑,探索出三者分别与初始含水率之间的最佳拟合关系即为指数函数关系。By laboratory experiments to simulate the on-site construction conditions,use dry heavy compaction test,preparation 7groups of soil sample in different initial moisture,analysis the change trend of the expansion force,the expansion rate and the last water absorption in different initial moisture;Using numerical software＂Origin 7.5＂,do the further linear fit and the S-curve fit between the expansion force and the initial moisture content,the expansion rate and the initial moisture content,the last water absorption and the initial moisture content.The result is when the initial moisture content increases,the expansion force,the expansion rate and the last water absorption show a reducing trend;When the expansive soils of the water absorption rate in about 5%,it can reach the limit swelling moisture and promote soil expansion stable;the three results of the S-curve fit are all better than the linear fit,In the S-curve fit,considering the value of Chi^/DoFand the value of R^2,find out the best fit relationship between the expansion force and the initial moisture content,the expansion rate and the initial moisture content,the last water absorption and the initial moisture content is the exponential function relationship.

关 键 词：膨胀土 膨胀力 膨胀率 终止吸水率 初始含水率 

分 类 号：TU411[建筑科学—岩土工程]