Optimization And Stability Study Of Treatment Plan For Xihuashan T2 Subsidence Area

Based on the treatment engineering of T2 subsidence area in Xihua moutain mine park,the optimization of treatment scheme and the overall stability of surface after the implementation of treatment scheme were studied,and the following work was mainly completed:1.Through field investigation,the lithological distribution law of T2 collapse control area was proved;The data of physical and mechanical parameters of core were obtained through on-site sampling and laboratory test,and the data were processed by probability statistical regression method.Through the underground engineering geological survey,the development characteristics of joints and fractures were proved,and the rock mass was RMR.Through the GSI rock mass classification system based on hoek-brown and the empirical formula methods such as m.geeorgi method,elastic wave method,coefficient conversion method and empirical discount method,the mechanical parameters of rock mass after engineering weakening were determined relatively objectively.2.In view of the lack of mining data in most periods during the hundred years of mining in Xihua mountain,there is great uncertainty in underground cavities.By means of high-density electrical exploration combined with borehole verification,the missing parts in the plane and section diagrams of each middle section are completed to eliminate the uncertainty of underground cavities.By DIMINE software will be the Xihua moutain mine park in T2subsidence of the earth's surface,roadway and three-dimensional entity model of underground mined-out area was built,and the preliminary underground mined-out area and the size of roadway tunnel volume is about 200000 m³,underground cavity volume is about 2.3 million m³,total size of about 2.5 million m³,the subsequent filling governance according to the scheme design can depend on.3.on the basis of the DIMINE model through the Rhino,build the numerical calculating model of the X axis span is 1300 m,Y direction span is 1000 m,the Z axis span is 500 m,consists of two fault F1 and F2 of T2 collapse control area,as well as more than 80 vein of the mined-out area hollowed out and used to simulate the filling,there are six vein exposed on the surface,after the execution of the excavation can successfully simulate the surface cracks,the model uses the maximum edge length of 10 m tetrahedral mesh,there are altogether 1337047nodes,7880299 units.4.through the design of two kinds of wall,five kinds of isolation plate and different combinations of the four kinds of packing material,the formation of forty filling scheme,using the means of FLAC^3D numerical simulation combined with Fish language,get various schemes of the plastic zone filling volume,surface subsidence,ground surface settlement of X,Y direction displacement,section,section stress extremum and other different types of data,through all kinds of data of the period before and after the analysis of independent analysis,management and combined with the data dimensionless processing after the overall analysis of analytic hierarchy process?AHP?,the optimal governance solution is obtained,which adopts C15 concrete as filling material,two wall design,Filling isolation bottom plate is set in the middle section of 270²90,and the combination scheme of filling isolation top plate is set above the middle section of 378.5.by deepening the data processing,the optimal scheme of data,converting it into the earth's surface and tilt,curvature and level of the surface deformation index,compared with the related requirements in non-ferrous metal mining design specifications,found that in addition to a few appear crack edge curvature numerical more than standard,the surface of the whole tends to be stable,suggest to take measures to prevent expanding the surface crack,based on the specification illustrate the applicability of the best solution.