Study on the Threshold Value of Colluvial Landslide under the Combined Action of Reservoir Water Level Variation and Rainfall:Taking Muping Landslide as an Example
Colluvial landslide is an important geological disaster during the operation of the Three Gorges Reservoir,and its deformation evolution is often affected by the variation of reservoir water level and rainfall intensity. How to determine the reasonable and effective threshold criterion under the joint action of reservoir water level and rainfall,and provide timely and reliable information for landslide prevention and emergency treatment is an urgent task. Taking the accumulation landslide-Muping landslide as an example,based on the real-time monitoring data and combined with the numerical simulation method,the threshold of reservoir water level change and rainfall intensity is studied. According to data analysis, the rate of reservoir water level decline is greater than or equal to 0. 11 m/ d and less than 0. 42 m/ d,4 ～10 d the accumulated rainfall is greater than or equal to 57. 3 mm,Muping landslide is prone to deformation. When the decline rate of reservoir water level is greater than 0. 42 m/ d and less than 0. 83 m/ d,4 ～10 d the accumulated rainfall ≥45. 8 mm, Muping landslide is prone to deformation. When the reservoir water level drop rate ≥0. 83 m/ d and 4 ～10 d the accumulated rainfall ≥22. 3 mm,Muping landslide is prone to deformation. Through numerical simulation analysis,when the reservoir water level drop rate ≥0. 4 m/ d,and the cumulative rainfall for three consecutive days ≥100 mm,Muping landslide is prone to deformation. The research results can provide a basis for the monitoring,early warning and forecasting of the Muping landslide,and also have some reference for the monitoring and early warning of the wading accumulation landslide.
colluvial landslidevariation of reservoir water levelrainfall intensitythreshold
万方数据
