Influence of Water Level Variation of A Certain Reservoir on Stability of Cofferdam Slope
In order to find out the rationality of reservoir cofferdam slope design and the influence of water level change on slope stability,based on FLAC3D numerical simulation software,a three-dimensional model of a certain reser-voir in Baise City was established to simulate the deformation of cofferdam slope under three working conditions of water level decline,water level rise and foundation pit drainage,and the influence of water level change on slope stability was analyzed.The results show that the first and second steps in the upper reaches and the second steps in the lower reaches of the cofferdam slope are prone to large deformation.The horizontal displacement of each monitoring point is 40-230 mm and the vertical displacement is 260-390 mm when the water level of the reservoir drops;The horizontal displacement of each monitoring point is 60-360 mm and the vertical displacement is about 150 mm when the water level of the reservoir rises;The horizontal displacement of each monitoring point is 580-600 mm and the vertical displacement is 21-57 mm when the foun-dation pit drains.The influence on the deformation of cofferdam slope is in the order of foundation pit drainage>reser-voir water level decrease>reservoir water level rise.The safety factor of slope is positively correlated with the water level.The increment of safety factor first increases and then decreases with the water level rising.The research provides a theoretical basis for slope design and protection.
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