不同水泥掺灰率下膨胀土抗剪强度参数的试验分析  

Experimental Analysis of the Shear Strength Parameters of Expansive Soil Under Different Cement Ash Mixing Rates

作　　者：蒋晓庆[1] 李永彪 林雁[1] JIANG Xiaoqing;LI Yongbiao;LIN Yan(Anhui Radio and Television University, Hefei 230022, China;Key Laboratory of Architecture and Underground Engineering, Anhui Jianzhu University, Hefei 230601, China)

机构地区：[1]安徽广播电视大学,合肥230022 [2]安徽建筑大学建筑结构与地下工程重点实验室,合肥230601

出　　处：《安徽广播电视大学学报》2020年第3期93-96,共4页Journal of Anhui Radio & TV University

基　　金：安徽省高等学校省级质量工程项目(项目编号:2017zhkt120);安徽省高校自然研究重点项目(项目编号:KJ2019A0971)。

摘　　要：为更深入地分析水泥和初始含水率对膨胀土的黏聚力和内摩擦角的影响,本次试验取水泥掺灰率从0%至6%,分为13个不同掺灰率,分别在5组不同初始含水率下进行室内直剪试验,不同掺灰率下的剪应力—剪位移关系曲线显示:在较低掺灰率下,剪应力—剪位移关系曲线基本呈应变硬化型,与初始含水率无关;但剪切位移随初始含水率增大而相应的变大。结合数值拟合结果显示:在相同初始含水率下,随着掺灰率的增加,黏聚力呈先缓慢增加后快速增加最后又缓慢增加的趋势,内摩擦角一直呈缓慢增加趋势;在相同掺灰率下,随着初始含水率的增加,黏聚力和内摩擦角均呈先增加后降低的趋势。In order to analyze the influence of cement and initial moisture content on the cohesive force and internal friction angle of expansive soil in depth,this experiment takes the cement ash admixture rate from 0%to 6%and divides it into 13 different ash admixture rates.And five groups of direct shear tests were carried out at different initial moisture contents.The curves of shear stress-shear displacement at different ashing rates show that at lower ashing rates,the shear stress-shear displacement curve is basically strain hardening and has nothing to do with the initial moisture content;but the shear displacement becomes larger with the increase of the initial moisture content.Combined with the numerical fitting results,it is shown that under the same initial moisture content,with the increase of the ashing rate,the cohesive force tends to increase slowly first,then increase rapidly,and then slowly increase.The internal friction angle has been increasing slowly.Under the ash mixing rate,with the increase of the initial moisture content,the cohesive force and internal friction angle both showed a trend of increasing first and then decreasing.

关 键 词：膨胀土 初始含水率 掺灰率 黏聚力 内摩擦角 

分 类 号：TU411.3[建筑科学—岩土工程]