EPS颗粒改良膨胀土强度试验研究  

Experimental Study on the Strength of EPS Granular Amended Expansive Soil

作　　者：赵奕杨 庄心善 聂去尘 文武 ZHAO Yiyang;ZHUANG Xinshan;NIE Quchen;WEN Wu(School of Civil Engin.,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《湖北工业大学学报》2023年第5期95-99,共5页Journal of Hubei University of Technology

基　　金：国家自然科学基金(51708190)。

摘　　要：选取湖北某边坡工程膨胀土为试验对象,在保持最大干密度和最优含水率的条件下,通过全自动三轴仪对不同掺量的EPS颗粒改良膨胀土进行三轴试验,探究了不同掺量的EPS颗粒与膨胀土抗剪强度间的关系。结果表明:土样主应力差值先快速增加后缓慢增加达到峰值后下降并稳定;素土样峰值强度最大;随着EPS颗粒掺量增加,土样的强度、黏聚力和内摩擦角都有变小的趋势;当掺量超过10%时,改良膨胀土的强度变化不明显;对比黏聚力、内摩擦角和掺量关系曲线表明黏聚力变化比内摩擦角更明显,说明黏聚力受掺量变化影响较大;通过拟合可得到黏聚力、内摩擦角与掺量的关系式。A slope project in Hubei expansive soil as the test object,maintaining the maximum dry density and optimum moisture content of the conditions of the fully automatic triaxial instrument,EPS particles of different amounts of modified expansive soil triaxial test,the test aims to explore the relationship between different amounts of EPS particles and expansive soil shear strength.The results showed that the difference in the main stress of the soil sample first increased rapidly and then increased slowly to reach the peak value and then decreased and stabilized;the peak strength of the pure expansive soil sample was the largest;with the increase of EPS particles,the strength,cohesion,and internal friction angle of the soil sample had a tendency to become smaller;when the doping amount exceeded 10%,the strength of the modified swelling soil did not change significantly;comparing the relationship curves of cohesion,internal friction angle,and doping amount showed that the change in cohesion was more obvious than the internal friction angle.The relationship between cohesion,internal friction angle,and doping amount shows that the change in cohesion is more obvious than that of the internal friction angle,which means that the cohesion is influenced by the change in doping amount.The relationship between cohesion,internal friction angle,and doping amount can be obtained by fitting.

关 键 词：EPS颗粒 膨胀土 三轴试验 抗剪强度 

分 类 号：TU411[建筑科学—岩土工程]