Feasibility analysis of height increase and capacity expansion of inner dump in Haerwusu Open-pit Coal Mine
In order to reduce the pressure of land use in the external dump of Haerwusu Open-pit Coal Mine,a three-dimensional model was constructed by using UAV tilt photography,and the slope stability of typical sections before and after increasing the height of the inner dump in the open-pit mine was compared and analyzed by three-dimensional numerical simulation software FLAC 3D and limit equilibrium method,and the feasibility of height increase and capacity expansion of inner dump under dead weight and rainstorm conditions was further analyzed.The results showed that the height increase of the inner dump had little effect on the overall vertical deformation of the three-dimensional site,and for the local settlement of the increased position,the influence depth caused by the height increase of the inner dump was mainly within 40 m below the original height;after the height increase,the ground uplift appeared at the elevation of 1 160 m,which was basically consistent with the stable sliding arc position of the slope.The safety factor of the inner dump in the elevation decreased nonlinearly with the increase of the capacity expansion height,and the overall law under the rainstorm condition was basically consistent with that of the dead weight condition,and the safety factor was reduced by about 19％.According to the requirements of the specifications,it was finally determined that the inner dump height of Haerwusu Open-pit Coal Mine can be increased to+1 320 m,and its minimum safety factors were 1.624 under dead weight condition and 1.313 under rainstorm condition.
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