Mechanical Properties of Creep-type Landslide Slip Zone Based on Ring Shear Test—A Case Study of Suo'ertou Landslide in Zhouqu Area of Gansu,China
The deformation of creep-type landslides is closely related to the mechanical properties of the slip zone.Investigating the variations in the mechanical properties of the slip zone under different water contents and gravel contents is crucial for understanding the deformation mechanisms of creep-type landslides.The slip soil of Suo'ertou landslide in Zhouqu area of Gansu was focused on.Through ring shear tests,the variations in the mechanical properties of the slip zone under different water contents(15％,19％and 22％),gravel contents(0％,5％and 15％),and shear rates(0.5,3.0 and 30.0 mm·min-1)were explored.The results show that① under long-distance shearing,the shear strength of the slip zone decreases with the increase in water content,while the displacement required to reach peak strength of the slip zone increases with the increase in water content;simultaneously,the residual cohesion of the slip zone significantly decreases with the increase in water content;② the shear strength of the slip zone increases with the increase in gravel content;③ as the shear rate increases,the shear strength of the slip zone gradually decreases,and the internal friction angle also shows a significant decreasing trend.Combining regional background information,it is suggested that the creep rate of Suo'ertou landslide in Zhouqiu area of Gansu is related to seasonal rainfall and fault activities.
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