Study On Residual Mobile Deformation Theory Over Ground Subsidence Basin Tendency Main Section Of Old Goaf

Old mining area tend to be the main section of the residual deformation research at present is mainly used in mining ground subsidence of governance, and the stability evaluation of building foundation.Old mining strata movement deformation and failure is one of the important factors that causes deformation of the ground surface residual goaf tendency and main section because there is a certain Angle, to derive a series of factors lead to upper stope covered by rock deformation and failure, so now at home and abroad on the analysis of coal residual deformation tendency in the cross section of the main aspects are still not very mature, and no more complete theory.Due procedure did not mention in the concept of residual deformation of old mining area, and the current research is limited to the mining area to the main section, therefore, tend to be the main section of the old mining surface subsidence basin residual deformation of the study are of great value in theory and application.At present, the rules of the duration of the surface movement deformation in the process of mining for T = 5.2 H0( d), the general is 3~5 years.According to the observation data, found that after this mining area is not completely stable, the surface still have the potential of mobile deformation. The same time as to the main section of the old goaf tendency the overlying stratified rock sliding failure, structure deformation is bigger than material deformation.In addition, overburden of coal seam by the normal force is smaller than the tangential force, which affect the occurrence of strata slip deformation.Analysis of strata in the mining of deeply inclined coal seam of the calculation results and floor strata,found along the old goaf tend to be the main section of rock in the tangential force and normal force, under the joint action of its deformation and destruction law of all majorchanges have taken place, its tendency to the main section of rock deformation and failure clearly focused on the mountain direction of old goaf, in addition, the mechanism of action of the bedrock surface, dip Angle of coal seam and precipitation, groundwater, earthquake and other factors will also result in residual deformation of old goaf. By studying the residual deformation mechanism of the old goaf tendency to the main section, probability integral method was applied to build its residual movement and deformation prediction model, get the first and second phase residual movement and deformation prediction formula, including residual subsidence, residual deformation, residual tilt, residual level movement and residual curvature.According to the established residual movement and deformation prediction model,program residual deformation prediction program with Matlab. Application engineering examples and numerical simulations to perform prediction model verification. And analyze the results and practical significance to verify the prediction formula.