Research on deformation and failure evolution law of inclined rock slopes with weak interlayers under water filling conditions
To study the entire process of deformation,failure,and sliding evolution of inclined rock slopes with weak interlayers under different water filling conditions,a metal open-pit mine in Heqing County,Yunnan Province was taken as the research object.A two-dimensional computational model was established using the continuous discontinuous method based numerical simulation software GDEM to simulate the deformation,failure,and ultimate instability and sliding evolution of rock slopes with double weak interlayers under water filling.The research results indicate that:(1)after water filling in the mining area,under the action of water pressure,the development of lateral cracks on the slope surface is suppressed,resulting in a decrease in both lateral and vertical displacement;(2)Under both waterless and water filled conditions,inclined rock slopes containing weak interlay-ers also exhibit a complete three-stage creep theory,namely deceleration creep stage,constant velocity creep stage,and acceleration creep stage;(3)After filling the mine pit with water,it has a pressure effect on the slope foot,but it is necessary to set the water level height reasonably,which can suppress the lateral and vertical deformation of the slope,and also consider the softening effect of high water level on the slope rock mass.The research results provide a basis for the treatment of closed pit water filling and the recycling of mine water storage in post mining mining areas.
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