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Flow Characteristics of Large-Scale Liquefaction-Slip of the Loess Strata in Shibei Tableland, Guyuan City, Induced by the 1920 Haiyuan M8 1/2 Earthquake
MA Xingyu1,2, WANG Lanmin1,2, WANG Qian1,2, WANG Ping1,2, ZHONG Xiumei1,2, PU Xiaowu1,2, LIU Fuqiang1,3, XU Xiaowei1,2
1.Key Laboratory of Loess Earthquake Engineering, China Earthquake Administration, Lanzhou 730000, China;2.Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China;3.Department of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China
摘要:
Based on the dynamic triaxial liquefaction test of the loess samples which are taken from Shibei tableland, Guyuan City, Ningxia, China, the characteristics of dynamic strain, dynamic stress and pore water pressure are studied under cyclic loading. Triaxial shear test is conducted immediately after the sample reaches liquefaction point. During the test, the property of the liquefied soil is analyzed through fluid mechanics method, whereby the fluidity of the liquefied soil is represented by apparent viscosity.The results show that the fluidity of liquefied loess changes from "shear thickening" to "shear thinning" as the shear force continues, and the fluidity of liquefied loess is closely related to its structure. In addition, in the process of forming a new stable state, the apparent viscosity and deviant stress change with axial strain in a similar approach. When the sample reaches its stable state, it meanwhile shows a relatively stable apparent viscosity. According to the fluid mechanics and the law of conservation of energy, the slip distance of the liquefied soil is estimated, and the results are in good agreement with the field investigation results.
关键词:  Saturated loess  Hydrodynamics  Liquefaction  Apparent viscosity
DOI:10.19743/j.cnki.0891-4176.202004007
分类号:
基金项目:This project is sponsored by the National Natural Science Foundation of China(U1939209,51778590) and the Spark Program (XH20057).
Flow Characteristics of Large-Scale Liquefaction-Slip of the Loess Strata in Shibei Tableland, Guyuan City, Induced by the 1920 Haiyuan M8 1/2 Earthquake
MA Xingyu1,2, WANG Lanmin1,2, WANG Qian1,2, WANG Ping1,2, ZHONG Xiumei1,2, PU Xiaowu1,2, LIU Fuqiang1,3, XU Xiaowei1,2
1.Key Laboratory of Loess Earthquake Engineering, China Earthquake Administration, Lanzhou 730000, China;2.Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China;3.Department of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China
Abstract:
Based on the dynamic triaxial liquefaction test of the loess samples which are taken from Shibei tableland, Guyuan City, Ningxia, China, the characteristics of dynamic strain, dynamic stress and pore water pressure are studied under cyclic loading. Triaxial shear test is conducted immediately after the sample reaches liquefaction point. During the test, the property of the liquefied soil is analyzed through fluid mechanics method, whereby the fluidity of the liquefied soil is represented by apparent viscosity.The results show that the fluidity of liquefied loess changes from "shear thickening" to "shear thinning" as the shear force continues, and the fluidity of liquefied loess is closely related to its structure. In addition, in the process of forming a new stable state, the apparent viscosity and deviant stress change with axial strain in a similar approach. When the sample reaches its stable state, it meanwhile shows a relatively stable apparent viscosity. According to the fluid mechanics and the law of conservation of energy, the slip distance of the liquefied soil is estimated, and the results are in good agreement with the field investigation results.
Key words:  Saturated loess  Hydrodynamics  Liquefaction  Apparent viscosity