Development Trend and Stability Analysis of Creep Landslide With Obvious Slip Zone Under Rainfall-Taking Xinchang Xiashan Basalt Slope as an Example

Chunyan Bao,Yongliang Huang,Lingtao Zhan,Zhenxing Zhao,Yingjie Xia

doi:10.3389/feart.2021.808086

Abstract

The creep slope is a dynamic development process, from stable deformation to instability failure. For the slope with sliding zone, it generally creeps along the sliding zone. If the sliding zone controlling the slope sliding does not have obvious displacement, and the slope has unexpected instability without warning, the harm and potential safety hazard are often much greater than the visible creep. Studying the development trend of this kind of landslide is of great significance to slope treatment and landslide early warning. Taking Xiashan village landslide in Huishan Town, Xinchang County, Zhejiang Province as an example, the landslide point was determined by numerical simulation in 2006. Generally, the landslide is a typical long-term slow deformation towards the free direction. Based on a new round of investigation and monitoring, this paper shows that there are signs of creeping on the surface of the landslide since 2003, and there is no creep on the deep sliding surface. The joint fissures in the landslide area are relatively developed, and rainfall infiltration will soften the soft rock and soil layer and greatly reduce its stability. This paper collects and arranges the rainfall data of the landslide area in recent 30 years, constructs the slope finite element model considering rainfall conditions through ANSYS finite element software, and carries out numerical simulation stability analysis. The results show that if cracks appear below or above the slope’s sliding surface, or are artificially damaged, the sliding surface may develop into weak cracks. Then, the plastic zone of penetration is offset; In the case of heavy rain, the slope can unload itself under the action of rainfall. At this time, the slope was unstable and the landslide happened suddenly.

Highlights

With the development of large-scale construction projects in the fields of mining, water conservancy, transportation and construction, a large number of large-scale and complex geological conditions have been encountered, such as mine slopes, dam collapses and reservoir bank landslides, which have made a big step forward in the study of landslide stability
Analysis of slope by field investigation and numerical simulation of body stability under heavy rainfall; through the combination of physical simulation and numerical simulation, the failure mechanism of landslides induced by heavy rainfall after coal seam mining is analyzed (Rauter et al, 2021; Zhou et al, 2021)
2) The landslide generally moves along the sliding zone, but the existence of the locking section curbs the creep displacement, and the slope will accumulate energy

Summary

INTRODUCTION

With the development of large-scale construction projects in the fields of mining, water conservancy, transportation and construction, a large number of large-scale and complex geological conditions have been encountered, such as mine slopes, dam collapses and reservoir bank landslides, which have made a big step forward in the study of landslide stability. Under the influence of continuous rainfall or heavy rain, surface irrigation water infiltrates into the aquifer of the landslide body, lubricating and softening the deep rock and soil mass (landslide), and directly damaging the stability of the natural slope locally (Bontemps et al, 2020; Løvholt et al, 2020). 4) Regular inspection and maintenance of slope waterproof and drainage facilities and reinforcement measures

CONCLUSION

DATA AVAILABILITY STATEMENT