冻融循环下吉林延边膨胀土水泥改良研究  

Study on engineering properties of expansive soil and properties of cement-modified expansive soil in Yanbian area of Jilin province under freeze-thaw cycles

作　　者：鲍硕超[1] 顾强 上官云龙 李妍[1] BAO Shuo-chao;GU Qiang;SHANGGUAN Yun-long;LI Yan(School of civil engineering,Jilin Jianzhu university,Changchun 130118,China)

机构地区：[1]吉林建筑大学土木工程学院,长春130118

出　　处：《吉林建筑大学学报》2023年第2期9-12,58,共5页Journal of Jilin Jianzhu University

基　　金：吉林省教育厅科学技术研究规划重点项目(JJKH20230345KJ);吉林省科技厅国际科技合作项目(20210402073GH);国家自然科学基金项目(42207209).

摘　　要：吉林省延边地区分布大量膨胀土,因其每年都经历冻融循环,导致延边地区部分路基工程的边坡开裂、滑坡、坍塌等工程灾害.为了提高该地区膨胀土的抗剪强度,加入2%,4%,6%,8%,10%水泥改良膨胀土进行不固结不排水三轴实验,测出其抗剪强度和粘聚力.结果表明,水泥量为6%的改良膨胀土比其它水泥量的改良膨胀土粘聚力和抗剪强度改良效果更加明显.A large amount of expansive soil is distributed in Yanbian area of Jilin province in China.These expansive soils are experiencing freeze-thaw cycles every year,which has led to the slope cracking,landslide,collapse and other engineering disasters of some roadbed projects in Yanbian area.In order to improve the shear strength of expansive soil in Yanbian area of Jilin province,five kinds of 2%,4%,6%,8%,10%portland cement were added under freeze-thaw cycles,the unconsolidated and undrained triaxial tests were carried out on five different parameters of cement-modified expansive soil to measure its shear strength and cohesion.The results show that the improved expansive soil with 6%cement parameter is more effective than that with other parameters through cohesion and shear strength,which provides some experiences and methods for the improvement of expansive soil in subgrade engineering in seasonal frozen area.

关 键 词：膨胀土 冻融循环 水泥改良 粘聚力 剪切峰值 

分 类 号：U416.1[交通运输工程—道路与铁道工程]