不同纤维处理水泥稳定粉砂土的三轴试验力学特性研究  

Study on mechanical properties of cemented sand treated with different fibers by triaxial test

作　　者：王静[1] 李东一 张云龙[1] WANG Jing;LI Dong-yi;ZHANG Yun-long(School of transportation science and engineering,Jilin Jianzhu university,Changchun 130118,China)

机构地区：[1]吉林建筑大学交通科学与工程学院,长春130118

出　　处：《吉林建筑大学学报》2022年第2期17-22,共6页Journal of Jilin Jianzhu University

摘　　要：为评价不同纤维对胶结砂的改善效果,选取目前应用较为广泛的聚丙烯纤维和具有较高抗拉强度和长径比的短切碳纤维对路基土进行三轴不固结不排水(UU)试验,探究不同纤维对胶结砂抗剪强度及其参数(黏聚力、内摩擦角)、吸能能力和脆性指数的影响.结果表明,碳纤维对于胶结砂强度的提升好于聚丙烯纤维,但会导致脆性指数增大;聚丙烯纤维能够有效提高胶结砂的吸能能力、有效降低脆性指数.两种纤维的最佳掺量均为0.75%.In order to evaluate the improvement effect of different fibers on cemented sand,the triaxial unconsolidated and undrained(UU)test of subgrade soil was carried out by using polypropylene fiber,which is widely used at present,and short-cut carbon fiber with high tensile strength and aspect ratio.The effects of different fibers on the shear strength and its parameters(cohesion,internal friction angle),energy absorption capacity and brittleness index of cemented sand were investigated.The results show that carbon fiber can improve the strength of cemented sand better than polypropylene fiber,but the brittleness index will increase.Polypropylene fiber can effectively improve the energy absorption capacity of cemented sand and reduce the brittleness index.The optimal dosage of both fibers is 0.75%.

关 键 词：路基土改良 碳纤维 聚丙烯纤维 力学特性 

分 类 号：U416[交通运输工程—道路与铁道工程]