Research On The Laws Of Ground Pressure Activity Caused By The Mining Of Double Ore Veins Under Complex Conditions

With the continuous exploitation of mining resources,non-renewable energy is increasingly consumed,and mining is gradually shifting from shallow to medium-deep.The primary problem is high stress and complex ground pressure.As the depth increases,the conditions for the occurrence of ore bodies become more and more complex,which brings great challenges to safety mining.The shallow hole shrinkage mining method and the stage stop method have high efficiency for mining steeply inclined veins,but at the same time,the problems are also very prominent.After the mining,the mining area has left a lot of empty areas,which brings the poles for subsequent mining safety hazards.Therefore,a reasonable mine mining sequence plays an important role in mine safety.Taking the drift piaotang tungsten industry as the research object,according to the mining status of the mining area,combined with the static and dynamic monitoring technology established,a practical deep mining plan is proposed.A large number of goafs not only affect the distribution of the stress field of the original rock,but also provide a release area for the energy and displacement fields of the rock mass accumulation,causing geological disasters such as fault slippage and roof falling.The main research contents and results of this paper are as follows:1.Investigate the mining area,obtain the distribution of the goaf and fault fracture zone,and combine the mine data to collect the hydrogeological conditions,the occurrence conditions of the veins and the rock mechanics parameters,and provide basis for subsequent modeling and assignment.2.According to the actual situation of the mine,the numerical simulation of the goaf in the west is established.The actual mining situation of the mining area is simulated by software such as CAD,ANSYS,FLAC^3D and Tecplot360.The model adopts 450×500×400m,and the middle section of 496,448 and 388 is based on the actual mining sequence of the mining area.The recovery is completed,and the intersection of the vein and the fault in the middle section of the 496 zone is obtained.The displacement of the empty zone is obviously changed,and the displacement of the top of the 124 stope in the middle section of 448 reaches1.7cm.3.According to the micro-seismic ground pressure monitoring system established in the mining area,the micro-seismic signals are processed by software,and the micro-seismic data is analyzed to obtain the trend of geostress activity and displacement stress in the western region.Through the analysis of b value,space distribution of micro-seismic parameters,cumulative energy index,Schmidt number,etc.,the early warning signs of rock mass rupture to instability are obtained,and 388 middle section 348 mining site has frequent pressure activities.4.Through the FLAC^3D numerical simulation analysis of the upper empty space,the mining sequence of the I belt and the III belt vein in the middle section of 328 is simulated by eight schemes.Through the displacement and stress changes of the scheme combined with the micro-seismic parameters,the final preferred option 2 is the stoping plan Program.It can fully exert the self-stability of the pillar and minimize the displacement stress change,which is conducive to maintaining the stability of the upper and lower plates of the mining area and production safety.