Sliding Mechanism and Cause Analysis of Hanyuan Landslide in Sichuan Province

Chen Huang ； Youyi Zhang

《International Core Journal of Engineering》 7卷10期 (2021/10) Pp. 202-213

https://doi.org/10.6919/ICJE.202110_7(10).0032

摘要

On August 21, 2020, Fuquan Town, Hanyuan County, Sichuan Province, landslide geological disasters, large rock landslides, landslides, destructive, causing huge losses to the local. This paper collects relevant data through field investigation. The movement and deformation mechanism and causes of Hanyuan landslide are analyzed, and the main results are as follows. 1. In recent years, the local surface of the landslide area has a certain tensile deformation, and the terrain changes greatly in the rear edge of the landslide and the steeper part of the middle and upper part of the landslide, forming a multi-stage dislocation platform. 2 The landslide is a traction landslide induced by rainfall. At present, it is in the stage of creep deformation. The failure mode is that the clay rock of Xigeda Formation is softened after soaking in groundwater, which leads to the decrease of shear strength and the formation of local bedding sliding at the edge of the scarp. 3. The landslide front is saturated, and the landslide is cut out from the shear outlet on the free face of the shear outlet. The transverse cracks at the trailing edge of the landslide continue to widen and deepen. 4. Under the action of continuous heavy rainfall, rainwater infiltrates into the sliding body and sliding surface, and sliding will occur. The landslide coverage directly slides out and accumulates in the valley, and the rare debris flow may occur.

關鍵字

Landslide Activities ； Sliding Mechanism ； Formation Mechanism ； Stability Analysis

參考文獻

J.MA, M. Z. ZHANG, B.HAN, et al. Cloud platform construction for geological hazards' data from UAV survey [J]. The Chinese Journal of Geological Hazard and Control, Vol.30 (2019) No. 1,p. 100-105.

C.Z.LIU. Basic problem on emergency disposition of abrupt heavy geological disaster[J]. Journal of Natural Disasters, (2006) No. 3, p. 24-30.

N.P JU, J.J ZHAO, H.DENG, et al. Analysis of deformation mechanism of sliding to bending slope and study of deformation emergency control at Huangshan expressway [J]. Advances in Earth Science, 2008(5): 474-481.

H.L.Wang. Analysis Method of Landslide Exploration Combined with Engineering Example [J]. Geotechnique, 2018, 33(4):194-198.

W.G.Mu, H.C.Liu, D.L.Wang. Study on landslide control countermeasures of collapse accumulation close to buildings [J]. Geotechnical Engineering Technology, 2018, 32 (1):37-40,54.