| In order to safely and efficiently recover the orebody under steep aquifer,it is necessary to determine a reasonable stope structure parameter and mining scheme to ensure that the water-induced fractured zone caused by mining will not run through the aquifuge of the overlying rock on the top plate of the mining field.Therefore,in this thesis,a combination of on-site sampling,indoor testing and numerical simulation was used to test the petrophysical and mechanical parameters of the ore body and surrounding rock.Based on this,a numerical simulation model of the structure parameters of the stope was established.Analysis of the developmental height of the water-induced fractured zone under the structure parameters of each stope,based on which determine the reasonable stope structure parameters,thus using the numerical simulation method to simulate the stope stability when the stope structure parameters under different recovery schemes,and then determine The optimal mining plan.The specific research results are as follows:(1)Using numerical simulation software,the numerical simulation of the top pillar is 3m,the bottom pillar is 5m,the spans of the mine house are 8m,9m,10 m,11m,12 m,and the 15 kinds of structural parameters of 3m,4m and 5m are used for numerical simulation and calculations.The results show that when the spans of the mine house are the same,the development height of the water-guiding fissure zone decreases with the increase of the inter-column,and the larger the span of the mine house,the higher the development height of the water-flowing fissure zone decreases with the increase of the inter-column.When the columns are the same,the development height of the water-guiding fissure zone increases with the span of the mine room,and the smaller the spar column,the development height of the water-flowing fissure zone increases dramatically with the increase of the mine house span.Therefore,the structural parameters of the mine span is 10 m and the distance between the columns is 4m.The development height of the water-guiding and fissure zone is smaller and it is the optimal stope structural parameter.(2)Numerical simulation software was used to calculate the distance between the column 4m and the span 10 m and the height of the gob area 10 m,12m,14 m,16m and 18 m.The results of the study show that: with the increase of the height of the goaf,the development height of the water-cutting fractured zone increases;when the height of the goaf is 10 m,the development height of the water-flowing fractured zone is 20 m,and the development height of the water-conducting fracture zone at this time It will penetrate the aquifer.Therefore,when the goaf height exceeds 8m,the development height of the water-flow fractured zone will permeate the aquifer.At this time,the mining method must be used for mining,and the height of the goaf area should be controlled within 8m.(3)Using FLAC 3D to conduct a numerical simulation study on the five mining sequences of the mining area.The results show that: the order of mining from the bottom to the top of the ore and the double-mining room is the most The order of rationality;and the order of mining is the mining of the single-number mines in the middle five sections of the ore body at first,and then these single-numbered mines will be filled;these mines will be filled and the mined double-mining houses in the middle section will be mined,then refilled.These double mines.After the stoppage and filling of the middle five sections are completed,the fourth middle section will be collected and filled in the same order.After the stop and filling of the fourth middle section,the third middle section will be collected and filled in the same order. |
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