摘要
在室内动液化试验的基础上,对液化后的试样进行三轴剪切试验,并利用流体力学方法对黄土液化流动性进行了研究。研究表明:液化后的试样在受三轴剪切作用时,其表观黏度呈现先增大后减小的现象,即其流动特性会出现从"剪切稠化"到"剪切稀化"的转变。这种现象的出现可能与黄土特殊的结构性以及试验所采取的液化标准趋于保守有关。石碑塬地区特殊的地质环境和黄土的"剪切稀化"性质导致了低角度、长距离液化滑移灾害的发生。
Based on the laboratory dynamic liquefaction tests,the triaxial shear tests are carried out on the liquefied samples,and the liquefaction fluidity of loess is studied by using the fluid mechanics method.The results show that the apparent viscosity of liquefied samples increases first and then decreases when subjected to triaxial shear,that is,the flow characteristics will change from“shear thickening”to“shear thinning”.This phenomenon may be related to the special structure of loess and the conservative liquefaction standard adopted in the tests.The special geological environment and the“shear thinning”property of loess in Shibeiyuan area lead to the occurrence of low-angle and long-distance liquefaction slip disasters.
作者
马星宇
王兰民
王谦
王平
钟秀梅
蒲小武
刘富强
MA Xing-yu;WANG Lan-min;WANG Qian;WANG Ping;ZHONG Xiu-mei;PU Xiao-wu;LIU Fu-qiang(Key Laboratory of Loess Earthquake Engineering,China Earthquake Administration,Lanzhou 730000,China;Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,China;Department of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2021年第S01期161-165,共5页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(U1939209,51778590)
地震科技星火计划项目(XH20057)
关键词
黄土
表观黏度
剪切稀化
液化滑移
loess
apparent viscosity
shear thinning
liquefaction slip
