Investigation of Failure Surface Depth and Groundwater Effects in Guanghua Landslide through Material Point Analysis
Journal
Journal of Chinese Soil and Water Conservation
Journal Volume
54
Journal Issue
3
Date Issued
2023-01-01
Author(s)
Peng, Yi Pin
Kuo, Chih Ping
Lee, Wei Lin
Wang, Jyun Yen
Chen, Chao Wei
Chu, Shih Wen
Pai, Chao Chin
Abstract
Site investigation and long-term monitoring are crucial for planning and designing slope stabilization measures. However, specific in situ topographical and environmental constraints may prevent people and machines from accessing a site, which limits the slope data that can be collected. Therefore, in this case study, monitoring data and numerical analyses with the material point method were used to evaluate the failure surface depth involved in the Guanghua landslide and to predict its subsequent post-failure behavior. The numerical results indicated that the failure surface developed at a depth of 40–50 m in fractured rock and extended from the upper to the lower slope, causing the slope to settle at the upper section and rise at the lower section. When the sliding masses converged at a valley, the overall movement of the slope along the deep failure surface ceased because of topographical constraints. This numerical result corresponded to the field observations of the Guanghua landslide. The numerical analysis of a high-groundwater-level scenario also revealed that when the groundwater level inside the colluvium layer rises to 7 m below the slope surface, a subsequent landslide in the colluvium layer may occur.
Subjects
failure surface | large deformation | material point method | post-failure behavior
SDGs
Type
journal article