Study On Mechanism Of Slope Sliding Induced By Combined Mining From Underground To Open Pit

In the process of mining,due to the limitation of resource occurrence conditions and mining technology,the transformation between mining processes often occurs,resulting in several mutual disturbances and superposition of rocks in the affected area,which seriously affects the safety of mine production and surrounding environment and safety.Therefore,this paper combines the impact of mining in Laohutai mining area on the slope safety of east open pit mine And the dynamic evolution mechanism and influence range of the old underground mining area reactivated by the continuous deep mining of the east open pit mine.The research results provide a basis for mine production and environmental safety.The main research contents are as follows:(1)According to the engineering geological data of the mining area and the subsequent mining design scheme,the surface deformation and damage range induced by several mining superposition in different periods in the mining area is studied by using the numerical simulation method,the surface influence range is divided,and the safety of municipal roads is evaluated.(2)Based on the mining in Laohutai well mining area,the numerical simulation study is carried out on the deformation and failure range of slope surface induced by continuous deep mining in east open pit mine,the sliding mechanism of slope induced by underground to open pit mining is revealed,and it is systematically expounded that with the extension of open pit mining,the position change of maximum horizontal displacement and maximum settlement of slope surface gradually decreases,and the stress of slope rock mass gradually moves into the pit,It shows that the top coal caving mining in underground mining area is affected by the activation induced by open-pit mining,and the influence on the stability of slope increases gradually.(3)On the basis of fully considering the influence of underground mining on the activation of slope rock mass,the stability of slope is evaluated.The calculation results show that the open-pit design slope is still in a safe state.However,with the influence of blasting and other factors in the process of open-pit extended mining,the slope will be partially unstable.Therefore,corresponding monitoring means should be established in the process of open-pit mining to ensure the safe production of the mine.(4)Combined with the numerical simulation results of underground mining and underground mining before open-pit mining,and according to the distribution characteristics of building facilities and municipal facilities around Laohutai mining area,the reinforcement scheme of building facilities is put forward to provide corresponding technical support for mine safety and ensure the safe operation of mine production.