Optimization Of Filling Mining Method Under Different Surrounding Rock Conditions

In view of the shortage of domestic mineral resources and the difficulty of ore mining,in order to ensure the efficient mining of mineral resources and ensure the stability of surrounding rock,the research on talc mine and iron ore mining has been carried out.Through indoor experiments on talc,magnesite marble and backfill materials,the material parameters were obtained for subsequent simulation.The vertical cross mining method,the hexagonal cement filling mining method and the rectangular cement filling mining method are respectively applied to the talc mining and iron ore mining for the initial mining method comparison,and the mechanical properties of the surrounding rock are combined by theoretical calculation and numerical simulation.The mining pressure of the stope is analyzed,and the filling height,different filling body strength,different secondary filling strength and different mining sequence are selected as the influencing factors,respectively,from surrounding rock deformation,surrounding rock stress transfer mechanism,and surrounding rock plastic zone.Analytical research on evolution mechanism and safety factor of surrounding rock.The vertical cross mining method is applied to talc mining,and the hexagonal downward cementation filling mining method is applied to iron ore mining.The conclusions of the paper are as follows:(1)The preliminary comparison of different mining methods is carried out,and the theoretical calculation method is adopted.The calculation of the pressure of the buried rock chamber is carried out by using the unit circle mapping function to derive the hexagonal mapping function,and the calculation method of the hexagonal surrounding rock pressure is obtained.The numerical simulation and analytical solution are used to verify the pressure of surrounding rock in different strengths.The surrounding rock deformation,surrounding rock stress and surrounding rock plastic zone damage situation of different mining methods are analyzed.The results show that the vertical cross mining method is more suitable for lower surrounding rock grade.For talc mining,the hexagonal down-way cementation filling mining method is more suitable for iron ore mining.(2)When the vertical cross mining method is applied to the talc mining,it is found that with the increase of one filling height,the strengthening of the filling body,the settlement of the surrounding rock roof,the plastic zone area of the surrounding rock and the surrounding rock stress.Reduced.The largest settlement area in the talc mining is located in the left part ofthe roof of the mining area,which is the most dangerous area.The largest bottom drum area is located at the right end of the surrounding rock floor;the maximum stress value is located at the right end of the surrounding rock roof and the left end of the surrounding rock floor;The plastic zone on the upper part of the upper part and the mining area is seriously damaged,and the plastic zone is mainly shear failure.(3)Applying the hexagonal downward cementation filling mining method to iron ore mining,it is found that the settlement trend of surrounding rock roof is relatively stable.The surrounding rock before the mining experience is replaced by the transition layer of the original rock layer being filled,and the surrounding rock roof The settlement is steep.In the subsequent mining,the settlement of the roof increases slowly with the depth of mining.The maximum deformation of the surrounding rock is located at the center of the surrounding rock roof.After the rock mass is replaced by the filling body,the surrounding rock stress is redistributed,and the surrounding rock stress is middle.It is transferred to both sides;the plastic zone of the surrounding rock is mainly distributed on both sides of the mining area,and the plastic zone is mainly damaged by shear failure.(4)The effects of one-time filling height,filling body strength,and route mining sequence on the stability of surrounding rock are studied systematically,from surrounding rock deformation,surrounding rock stress transfer,surrounding rock plastic zone evolution,and surrounding rock.Analysis of the safety factor.The results show that the effects of mining sequence,filling body strength and filling height on the stability of surrounding rock are weakened in turn,mining order is the main influencing factor,and the filling body strength and the filling height of the approach are secondary influencing factors.(5)Analyze the two ore bodies under the influence of multiple factors from different angles.Combined with the actual situation of the project,the safety factor of surrounding rock is used as the criterion to determine the mining plan of a talc mine: a filling height of 1.5m,once The filling strength is 3.0 MPa,the secondary filling strength is 1.5 MPa,and the mining sequence is one by one;an iron ore mining plan is: one filling height is 2.6 m,one filling strength is 1.0 MPa,and the secondary filling strength is 0.7 MPa.The mining sequence is one by one;it provides engineering basis for a certain iron ore mine and a talc mine in Liaoning.