Method for determining reservoir water level drop rate threshold in reservoir area landslide stable state

Abstract

The invention discloses a method for determining a reservoir water level descending rate threshold in a reservoir area landslide stable state. The method comprises the following steps of firstly, establishing a physical model of reservoir area landslide, setting a reservoir water level descending rate to carry out a landslide physical model test, and monitoring underground water level data and landslide displacement data in the landslide in a reservoir water level descending process; calculating water level difference inside and outside the landslide; constructing a relation curve between thewater level difference inside and outside the landslide and the landslide displacement; fitting to obtain a function relationship delta h(u) between the water level difference inside and outside the landslide and the displacement of the landslide in the reservoir water level change process; and calculating a derivative value delta h'(umax) corresponding to the maximum displacement of the landslide, and when the value of delta h'(umax) is 1.00-1.10, indicating that the landslide is in an ultimate equilibrium state, and the reservoir water level descending rate at the moment being a reservoir water level descending rate threshold value. The method is advantaged in that the underground water level of the landslide, the water level difference inside and outside the landslide and landslide deformation are associated to serve as a basis for determining the reservoir water level descending rate threshold, and the reservoir water level descending rate threshold can be determined simply, quickly, scientifically and reasonably.

Description

technical field [0001] The invention relates to a method for determining a reservoir water level drop rate threshold under a landslide stable state in a reservoir area, and belongs to the technical field of geological disasters. Background technique [0002] Many landslides distributed in the reservoir area, especially the huge landslides, have become an important threat to the safe operation of many high dams and large reservoirs. When the reservoir water level drops, due to the slow dissipation of groundwater in the landslide, the formation of hydrodynamic pressure pointing to the outside of the slope surface, and the decrease of the hydrostatic pressure of the wading slope are one of the main factors inducing the landslide in the reservoir area. [0003] Changes in the drop rate of reservoir water level will inevitably lead to changes in the groundwater level of landslides in the reservoir area, and then lead to changes in the internal stress field of the landslide, and c...

AI Technical Summary

Problems solved by technology

However, there is no effective method for determining the threshold of the reservoir water level drop rate in the prior art.

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