Research On Mining Methods Of Underground Mining In Hongnipo Copper Mine

he mining subsidence caused by underground mining activities has changed the original geological structure,terrain and landform of the mine,brought serious negative impact on the ecological environment and safe production of the mining area,and affected the sustainable development of the mine.Using waste rock or tailings to treat the goaf can effectively control the movement and deformation of rock strata.However,due to the complexity and uncertainty of underground mining environment,the mining area geology,ore body characteristics,mining technical conditions and technical requirements of different mines are different,and there are great differences in mining methods.It is of great scientific significance and engineering value for the safe and green mining of mines to study the mining methods and the law of strata movement under complex surface conditions and prevent the adverse impact of underground mining on the surface.Based on hongnipo copper mine,this paper studies the mining method under complex surface conditions and the law of underground mining strata movement and surface subsidence by using the methods of field investigation,rock mechanics test and three-dimensional numerical simulation.The main contents are as follows:(1)According to the field investigation and rock mechanics research,the mechanical parameters of ore rock and tailings are obtained,the in-situ stress distribution law of the mining area is summarized,and the calculation parameters are provided for three-dimensional numerical simulation.(2)The main factors affecting the selection of mining methods under complex surface conditions are introduced.Through the primary selection of mining methods and the comparison of economic and technical indexes,the mining method of hongnipo copper mine is studied and determined,which provides a method basis for the study of rock stratum movement and deformation law.(3)The three-dimensional numerical model of the mine is established by using the finite difference software FLAC3 D,the applicability of the mining method is simulated,and the laws of underground mining strata movement and surface settlement under complex surface conditions are studied.The results show that after the underground mining of hongnipo copper mine,the maximum surface settlement is located in the northwest of Jinzhi tailings pond,and the maximum settlement value is 8.44 cm.(4)The probability integral method is used to calculate the surface movement and deformation value of the mining area.During the underground mining of hongnipo copper mine,the surface villages and buildings(structures)are in a stable state,which provides measures and suggestions for the monitoring of surface tailings pond and mine.The research conclusion has strong guiding significance for the mining of hongnipo copper mine.