不同水分状态下膨胀土工程特性及反复剪强度试验  

Engineering characteristics and the repeat shear strength of expansive soil under the influence of moisture content

作　　者：何鹏 王振[2] HE Peng;WANG Zhen(School of Civil Engineering and Architecture,Xi′an University of Technology,Xi′an 710048,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]西安理工大学土木建筑工程学院,西安710048 [2]同济大学地下建筑与工程系,上海200092

出　　处：《南水北调与水利科技》2017年第A02期195-199,216,共6页South-to-North Water Transfers and Water Science & Technology

摘　　要：以南水北调中线禹州段膨胀土为研究对象,通过对膨胀土在不同初始含水量状态下物理特性及抗剪强度进行试验研究,得到了重塑膨胀土的膨胀特性、抗剪强度随含水率的变化规律,并且分析了膨胀土膨胀率、膨胀力以及峰值强度,残余强度随含水率变化的相关关系。试验结果表明:膨胀力与初始含水率具有线性相关性,膨胀率与含水率呈现了对数关系;峰值强度与残余强度均随含水率的升高而降低,呈现对数关系;含水率的变化对抗剪强度指标有较大的影响,具体表现为随着含水率的增加粘聚力与内摩擦角均减小。Taking the yuzhou section of middle Route of South to North Water Transfer Project for the study object,by studying about physical properties and shear strength of expansive soil in different initial states of moisture contents,The variation of the expansion characteristics and shear strength of the expansive soil with the water content were found,The relationship of swelling deformation,swelling force peak strength,residual strength with changes in moisture content of compacted expansive soils are summarized.The results demonstrate that the swelling force has a linear correlation with moisture content,and expansion rate showed a logarithmic relationship with water content,the peak strength and residual strength decreases with the increase of initial moisture content also showed a logarithmic relationship with water content.Water content have a larger impact on shear strength parameters performance,Reflected in both decreased with the increase of the water content of cohesion and angle of internal friction.

关 键 词：膨胀土 膨胀率 膨胀力 峰值强度 残余强度 

分 类 号：TU443[建筑科学—岩土工程]