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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(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2024年第05期
Page:
677-688
Research Field:
工程地质与环境灾害
Publishing date:

Info

Title:
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
Author(s):
LU Chang-ming1;  WANG Zuo-peng1*;  WU Liang2;  QUAN Ye-zi1;  NING Rui-hao1;  GAN Liang-cheng1
(1. School of Engineering and Technology, China University of Geosciences, Beijing 100083, China; 2. Qinghai Istitute of Geo-environment Monitoring, Xining 810008, Qinghai, China)
Keywords:
landslide;  slip zone;  ring shear test;  water content;  gravel content;  shear rate;  residual strength;  Gansu
PACS:
P642.22
DOI:
10.19814/j.jese.2024.03052
Abstract:
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 that ① 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 Zhouqu area of Gansu is related to seasonal rainfall and fault activities.

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Last Update: 2024-10-01