Analysis of slopes stability in slide-prone area of open-pit mine based on fluid-solid coupling
In order to reveal the mechanism of slope fluid-solid coupling under the influence of rainfall in the open-pit mine slippery area,investigate the change rule of internal pore water pressure and stability of the slope in the whole process of rainfall,and determine the design parameters of the slope in the slippery area;based on the limit equilibrium method,the slopes stability of slide-prone area in open-pit mine is analyzed through the SEEP/W and Slope/W coupling analysis model.The results show that the pore water pressure in the non-rainfall state is distributed in a layer along the direction of groundwater,and the pore water pressure within the slope geotechnical body changes greatly with rainfall.The position of the infiltration line inside the slope deepens with the rainfall,and the temporary saturated zone near the slope surface seeps down to the unsaturated zone after the rain stops,while the upper temporary saturated zone slowly disappears into the unsaturated zone due to the downward recharge.The slope stability coefficients under different slope angles show a first decrease and then stabilization with rainfall,when the slope angle of 565 steps is 45°,the slope stability always meets the design value requirements during the whole rainfall process,so the slope angle of the steps in this landslide-prone area of the mine is recommended to be set at 45°.
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