Influence of declining rate of reservoir water level on the stability of gently inclined colluvial landslide
Gently inclined colluvial landslide is a common type of geological hazard in the reservoir area.It is often characterized by large volume,complex material composition,and periodic and long-term deforma-tion.The declining of reservoir water level is often an important factor inducing the deformation and failure of such landslide.Therefore,it is of great significance to study the influence of the declining rate of reser-voir water level on the stability of gently inclined colluvial landslide.In this paper,Hejiapingzi landslide in Guizhou Province as a gently inclined colluvial landslide is taken as an example to study the stability re-sponse of different landslide material under different declining rates(0.5,0.7,0.9,1.1 and 1.3 m/d)of reservoir water level.Under different declining rates of reservoir water level,different landslide parts show that the stability firstly decreases and then increases,and the stability coefficient of the landslide declines with the increase of the declining rate.The deformation of the landslide area with weak permeability is greater than that in the area with strong permeability.The simulation results are consistent with the on-site monitoring data,and the response of landslide stability to the declining rate of reservoir water level shows obvious spatial differences.In the risk prevention and control of gently inclined colluvial landslide,the rela-tionship between the declining rate of reservoir water level,the landslide material and the landslide defor-mation should be fully considered.
gently inclined colluvial landslidedeclining rate of reservoir water leveldifference in structurelandslide stability
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