冻融循环次数对粉质黏土强度劣化影响的试验研究  

Experimental study on the effect of the number of freeze-thaw cycles on the strength deterioration of silty clay

作　　者：孙超[1] 谷鸿雁 郭浩天[1] SUN Chao;GU Hong-yan;GUO Hao-tian(School of geomatics and prospecting engineering,Jilin Jianzhu university,Changchun 130118,China)

机构地区：[1]吉林建筑大学测绘与勘查工程学院,长春130118

出　　处：《吉林建筑大学学报》2024年第5期66-71,共6页Journal of Jilin Jianzhu University

基　　金：第七届中国科协青年人才托举工程(2021QNRC001);吉林省科技发展计划项目(YDZJ202201ZYTS490).

摘　　要：为明确不同冻融循环次数对粉质黏土抗剪强度的劣化程度,以天然含水率为基准,在不同冻融循环次数作用下,对重塑土样开展不固结不排水剪切试验,并建立基于Logistic数学模型的黏聚力与内摩擦角的冻融劣化模型。结果表明:冻融循环作用对粉质黏土的抗剪强度具有劣化影响。粉质黏土的黏聚力和内摩擦角随着冻融循环次数的增加而逐渐减小,最终趋于稳定,其劣化度与Logistic冻融劣化模型具有较高拟合度。冻融循环作用下粉质黏土的黏聚力比内摩擦角的劣化幅度和初始劣化速率更大。To clarify the deterioration degree of silty clay's shear strength due to different freeze-thaw cycles,unconsolidated undrained shear tests were carried out on reshaping soil samples under different freeze-thaw cycles based on natural moisture content,and a freeze-thaw deterioration model based on Logistic mathematical model of cohesion and internal friction angle was established.The results show that the freeze-thaw cycle has a deterioration effect on the shear strength of silty clay.The cohesion and internal friction angle of silty clay gradually decrease with the increase of freeze-thaw cycles,and eventually tend to be stable.The deterioration degree of silty clay has a high fitting degree with the Logistic freeze-thaw deterioration model.The deterioration amplitude and initial deterioration rate of cohesion are larger relative to the internal friction angle.

关 键 词：冻融循环 粉质黏土 抗剪强度 劣化度 

分 类 号：TU411[建筑科学—岩土工程]