Mine Self-reliance Of Cementing Filling Body Stability Study

The filling mining method can make a higher ore recovery rate and a smaller dilution rate.lt can effectively control the ground pressure in the mining area, especially in the case that the ground surface is forbider to fall, the method is almost preferred. When the ore body is being develeped, it should use the filling mining method by comprehensively considered the technical and economic conditions. This thesis uses the tailings backfill pillar in the54-58panel filling test mining of the middle part of the435copper mine as the research object. After uknow the regional geological, hydro-geological conditions and mining technology conditions, the author uses the numerical simulation software FLAC3D through the finite different method to establish a three-dimensional solid model for the54-58panel filling test mining of the middle part of435copper mine. The process of excavation of the backfill pillar area, backfilling the filling pillar and backfill mining are simulated. The completed research work in the paper are as follows:1Through carring on the field research about the54-58panel of the middle part of435copper mine and collecting the relevant geological data, combined with mining conditions and mining status of the ore body refered to the exploitation of experience of the similar mines, and analyzed the design methods and parameters of the backfill pillar to determine the design alternative.2According to the basic situation of the mining area, established a three-dimensional model of the mining area by FLAC3D software;3The three-dimensional model including different submodels according to a filling cycle of miming area such as,backfilling the excavation of the pillar area, filling the pillar region with backfill, backfilling both totally hollow sides of the mining room, filling the stope empty area, it can be used to carry on numerical simulation and calculation of processes and obtain the size, distribution and other characteristics of displacement, stress and plastic strain zone;4According to the mechanical role played by the backfill pillar in the underground stope, combined the characteristics of the surrounding rock and backfill pillar displacement, stress, plastic strain zone size and its distribution of the backfill independence as a precondition carried out the design for the condition of the backfill pillar on the mechanism analysis of the mechanical role. 5Through analyzing the characteristics of the size and distribution of the displacement, stress and plastic strain zone of the surrounding rock and filling pillar, it can know the existed stress concentrated and easy damaged areas to understand and analyze the existence of stress prone damage areas.6Based on reliability theory, analyzed the reliability of the backfill pillar, determined its stability,analyzed the factors of instability and made some advices.7Combined with the result of the numerical simulation and stability evaluation, made feasible protective measures and notes for the filling operation and construction processes for the backfill pillar and stope area to ensure that the backfill pillar can fulfill their role and avoid roof fall and other safety incidents.