冀北地区重塑膨胀土抗剪强度影响因素分析  

Analysis of influence factors on shear strength of remolded expansive soil

作　　者：王晓燕 高峰[2] 胡建林[1,3] 郑瑞海 张艳丽 薛金昊[1] WANG Xiaoyan;GAO Feng;HU Jianlin;ZHENG Ruihai;ZHANG Yanli;XUE Jinhao(Hebei University of Architecture,Zhangjiakou,Hebei 075000;Shanxi Datong University,Datong 037003,Shanxi,China;Hebei Solid Waste Comprehensive Utilization Technology Innovation Center of Asphalt Pavement Engineering,Zhangjiakou 075000,China)

机构地区：[1]河北建筑工程学院,河北张家口075000 [2]山西大同大学,山西大同037003 [3]河北省沥青路面工程固废综合利用技术创新中心,河北张家口075000

出　　处：《河北建筑工程学院学报》2023年第1期69-74,共6页Journal of Hebei Institute of Architecture and Civil Engineering

基　　金：河北省省属高等学校基本科研业务费研究项目(2021QNJS02);河北建筑工程学院硕士研究生创新基金项目(XY202202)。

摘　　要：为研究冀北地区重塑膨胀土的抗剪强度特性,对不同含水率、不同干密度的重塑膨胀土进行了快剪实验,分析了法向应力、含水率、干密度对膨胀土抗剪强度的影响,并采用灰色关联理论分析了各因素对土体抗剪强度及残余强度的影响程度。研究结果表明:含水率、干密度及法向应力对抗剪强度均有较大影响,法向应力及干密度的增加均会造成抗剪强度的增大,而随着含水率的增加,抗剪强度先增后减,且在最优含水率处达到峰值;从应力应变曲线可以看出,随着干密度的增大,膨胀土的剪应力-应变特性由应变硬化型转化为应变软化型;由灰色关联理论计算结果可以得出干密度对重塑膨胀土抗剪强度的影响最大,法向应力对重塑膨胀土残余强度的影响最大。In order to study the shear strength characteristics of remolded expansive soil in northern Hebei Province,rapid shear experiments were carried out on remolded expansive soil with different water content and dry density,and the influences of normal stress,water content and dry density on the shear strength of expansive soil were analyzed.Grey correlation theory was used to analyze the influences of various factors on the shear strength and residual strength of soil.The results show that water content,dry density and normal stress all have great influence on the shear strength.The increase of normal stress and dry density will lead to the increase of shear strength,but with the increase of water content,the shear strength first increases and then decreases,and reaches the peak value at the optimal water content.It can be seen from the stress-strain curve that the shear stress-strain characteristics of expansive soil change from strain hardening to strain softening with the increase of dry density.The results of grey correlation theory show that dry density has the greatest influence on the shear strength of remolded expansive soil and normal stress has the greatest influence on the residual strength of remolded expansive soil.

关 键 词：膨胀土 抗剪强度 残余强度 直剪试验 灰色关联理论 

分 类 号：TU4[建筑科学—土工工程]