Research On The Law Of Surface Movement And Deformation Induced By Multiple Middle Section Superposition Mining

The development of underground mineral resources induces the redistribution of stress field around,surface subsidence,and surface subsidence deformation,thus endangering the safety of surface buildings.Especially,the multi-middle superimposed mining and the interaction of superimposed areas will cause more severe damage.Therefore,it is of great theoretical and practical significance to study the influence of underground mineral resources exploitation on surface movement and deformation,to predict the extent of movement and destruction,and to put forward corresponding safety protection measures to ensure the safety of mine production.Taking Macheng Iron Mine as an example,this paper studies the impact of upward filling mining on the safety of many villages on the surface and control measures in two mining areas of steeply inclined orebody.The main contents are as follows:(1)According to the engineering geological survey data of Macheng Mine,the analysis model of underground mining is established by numerical simulation method,and the systematic numerical simulation analysis is carried out,which reveals the law of surface deformation of different mining thickness under the condition of simultaneous mining of two mining areas;with the increase of mining thickness of two mining areas,the mining deformation effect influences and overlaps each other,resulting in the range of ground deformation and the impact of mining is greater than that of single mining area.(2)The law of surface movement and deformation under different filling rate,different filling strength and different mining sequence was studied.From the results of the study,surface subsidence,horizontal displacement,inclination deformation,curvature deformation and horizontal deformation decreased with the increase of filling rate and filling strength.Compared with the mining deformation of single mining area,the deformation of simultaneous mining in two mining areas increased significantly.?(3)According to the results of numerical simulation and the stipulation of "three underneath" mining regulation,the scope of surface movement,the scope of destruction and the magnitude of movement angle are defined,and the safety and destruction zones of surface construction facilities are delineated.(4)According to the characteristics of the surface building structure in Macheng mining area,the protective measures and methods to reduce the surface deformation are put forward,and the safety reinforcement scheme is put forward,so as to provide a scientific basis for the safety protection of various facilities in the mining process and ensure the safety of mine production.