橡胶纤维加筋膨胀土在不排水和排水荷载下的剪切行为  

Shear Behavior of Rubber Fiber Reinforced Expansive Soil under Undrained and Drained Loads

作　　者：王荣昌 杨忠年[1] 时伟[1] 孙振兴 孟相 凌贤长 WANG Rong-chang;YANG Zhong-nian;SHI Wei;SUN Zhen-xing;MENG Xiang;LING Xian-zhang(Qingdao University of Technology,Qingdao 266033,China;Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]青岛理工大学,青岛市266033 [2]哈尔滨工业大学,黑龙江市150090

出　　处：《公路》2025年第4期357-363,共7页Highway

基　　金：国家自然科学基金项目,项目编号42177153;国家重大仪器开发项目,项目编号41627801。

摘　　要：以橡胶纤维加筋膨胀土(Expansive Soil-Rubber, ESR)为研究对象,进行了固结不排水试验及固结排水试验,旨在评估橡胶纤维和排水条件对膨胀土强度变形特征的影响。结果表明:橡胶纤维在试样内部传递应力和应变发挥了重要作用,使试样的破坏形态从中部隆起转变为隆起沿试样高度均匀分布;橡胶纤维提高了ESR的偏应力和孔隙水压力,并导致有效应力降低,橡胶纤维的最优含量为10%;ESR在剪切过程中表现出压缩行为,橡胶纤维加筋试样比未加筋试样表现出更大的初始收缩量,排水条件显著影响ESR的抗剪强度,固结排水条件下ESR的偏应力和有效黏聚力高于不排水条件的ESR,内摩擦角则相反;围压一定时,ESR的最大剪胀角与橡胶纤维含量呈正相关,随着橡胶纤维含量增加而增大。In this study,the Expansive Soil-Rubber(ESR)is used as the research object,and the consolidated undrained tests and the consolidated drained tests are carried out to evaluate the effects of rubber fiber and drained conditions on the strength and deformation characteristics of expansive soil.The main conclusions are as follows:Rubber fibers play an important role in transferring stress and strain inside the specimen,which changes the damage pattern of the specimen from a central bulge to a uniform distribution of the bulge along the height of the specimen.The deviator stress and pore water pressure of EsR are increased by rubber fibers,and the effective stress is reduced,and the optimal content of rubber fibers is 10%.The ESR shows compressive behavior during the shear process,and the rubber fiber reinforced specimens show a larger initial shrinkage than the unreinforced specimens.The deviator stress and effective cohesion of ESR under consolidated drained condition are higher than those under undrained condition,and the internal friction angle is opposite.When the confining pressure is constant,the maximum dilatation angle of ESR is positively correlated with the content of rubber fiber,and increases with the increase of rubber fiber content.

关 键 词：加筋膨胀土 橡胶纤维 排水条件 抗剪强度 剪胀角 

分 类 号：TU472.34[建筑科学—结构工程]