摘要
为了研究黄土脆性破坏规律,利用直剪仪对兰州原状Q_2黄土进行了不同含水量、不同剪切速率和不同法向压力下直接剪切试验.结果表明同一法向压力下黄土应力脆性指数随含水量的增大而不断减小,随剪切速率的增大呈先减小后增大的趋势,应力脆性指数与法向压力间的关系符合负指数函数关系.研究成果对于认识黄土结构强度和高速远程黄土滑坡滑动机理等方面均具有一定的借鉴意义.
According to direct shear tests of Q2 loess in Lanzhou under varied levels of moisture content, different shear rates and different normal pressures,the law for the brittle failure of loess was studied.The test results show that the stress brittle index of loess under the same normal pressure decreased with the increase of the moisture content;it also decreased with the increase of the shear rate,and then increased.Besides, the relationship between the stress brittle index of loess and the normal pressure accorded with a negative exponential function.References offered in the paper will be useful in further research on the structural strength of loess and the sliding mechanism of remote loess landslide at a high speed.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第6期21-25,共5页
Journal of Lanzhou University(Natural Sciences)
基金
甘肃省科学院应用技术研究与开发计划项目(2008-YS-JK-14)
教育部西部灾害与环境力学重点实验室开放基金项目(Klmwde201004)
关键词
黄土
脆性指数
含水量
剪切速率
法向压力
loess
brittle index
moisture content
shear rate
normal pressure
