冻融循环对含碎石黏土抗剪强度参数的影响研究  

Research on the Influence of Freeze-thaw Cycles on Shear Strength Parameters of Gravel Clay

作　　者：王丽黎[1] 高志华[1] 金龙[2] 陈冬根[2] 

机构地区：[1]长安大学建筑工程学院,西安710000 [2]中交第一公路勘察设计研究院有限公司,西安710000

出　　处：《路基工程》2016年第3期108-112,共5页Subgrade Engineering

摘　　要：以炉霍G317国道山坡上的含碎石黏土为研究对象,通过室内冻融循环试验,对不同干密度、含水量、冻融循环次数下的试样进行常规土力学试验,分析冻融循环前后土体对抗剪强度参数的影响。试验结果表明:随着冻融次数的增多,含水量为16.7%和21.4%的试样黏聚力增大,内摩擦角减小,而含水量为19.0%的试样则是黏聚力减小,内摩擦角增大;在相同的冻融次数下,不同含水量的试样内摩擦角均随着干密度的增大而增大,而黏聚力则相反;不同干密度的试样黏聚力和内摩擦角均随着含水量的增大而减小。Taking the gravel clay on the hillside of Luhuo section of G317 National Highway as the research object,through the indoor freeze-thaw cycle test,the normal soil mechanics test was performed on samples with different dry densities,moisture contents and freeze-thaw cycles,and the influence of soil mass on the shear strength parameters before and after freeze-thaw cycles were studied. The results showed that： with the increase number of freeze-thaw,the cohesion of sample was increased and the internal friction angle was reduced under the water content of 16. 7 % and 21. 4 %; while the cohesion was reduced and the internal friction angle was increased under water content of 19. 0 %. Under the same number of freeze-thaw,the internal friction angle of samples with different water contents would be increased with the increase of the dry density,while the cohesion was reduced with the increase of dry density. The cohesion and internal friction angle of samples with different dry densities would be increased with the reduction of water content.

关 键 词：冻融循环 含碎石黏土 黏聚力 内摩擦角 干密度 含水量 

分 类 号：TU411.7[建筑科学—岩土工程]