Research On Prediction Method Of Residual Movement And Deformation Of Surface In Inclined Main Section

With the continuous improvement of science and technology and the enhancement of people's awareness of environmental protection,it is increasingly recognized that the problem of subsidence area formed after coal mining is serious,and the residual movement and deformation of the surface of the goaf has an important impact on the stability of the building foundation.As an important part of the study of mining subsidence,the research on the residual movement and deformation of the surface of the goaf has become a hot topic in the research of mining subsidence.However,the existing regulations on residual movement and deformation of goaf are still blank.At present,the residual deformation of the goaf is mainly about the residual movement and deformation of the surface of the strike main section.There is no more accurate and complete research on residual movement and deformation of inclined main section,which can provide a theoretical basis for practical engineering.Therefore,in order to fill the blak in the regulations and provide a complete and reliable theoretical basis for the prediction of residual movement and deformation of inclined main section surface,the prediction method of residual deformation of inclined main section surface in goaf is mainly studied.When researching the prediction models of surface residual movement and deformation of main inclined section coal seam,the rock mass movement is assumed to be a discontinuous stochastic medium theoretical model according to the randomness of the movement after the breaking of the equilibrium state of rock mass,and the probability integral method is applyed to calculate prediction models.Because of the influence of coal seam pitch,the mechanism of surface residual movement and deformation of goaf is different,so the related prediction models are also different.Therefore,according to the size of coal seam dip,the theoretical content of theoretical prediction model deduction can be divided into two cases: gently inclined coal seam with coal seam pitch less than 36 degree number and large inclined angle coal seam with coal seam pitch larger than 36 degree number.The prediction models of residual surface movement and deformation of inclined main section in two cases are obtained.The prediction models of the main section of inclined main section include: residual subsidence,residual inclination,residual curvature,residual horizontal movement and residual horizontal deformation.Firstly,the prediction formulas of residual subsidence,residual inclination,residual curvature,residual horizontal movement and residual horizontal deformation under semi-infinite mining conditions are obtained by using probability integral method.Secondly,according to the mechanism of residual surface movement and deformation of inclined main section,the prediction models of residual surface movement and deformation of inclined main section under the condition of limited mining in gently inclined coal seam and large inclined angle coal seam are calculated by applying the principle of equal influence and the principle of superposition of semi-infinite mining.Then,based on the deduced prediction model,using VB and Matrix VB mixed programming,the related prediction software is obtained.Finally,to validate the prediction models.When validating the prediction models of gently inclined coal seam,the theoretical prediction model is simulated and verified quantitatively according to the actual observation data,and the result curves of five prediction models of gently inclined coal seam and large inclined angle coal seam are obtained.In order to ensure the generalization of the development software,it is necessary to compare with several practical projects.Quantitative verification of model comparison and qualitative verification of FLAC3 D simulation are used to verify the prediction model of large inclined angle coal seam.The theoretical prediction models are validated by examples,and the obtained results and the measured errors are within the allowable range,which proves the correctness and generalization of the theoretical prediction models and the development of software programming in practical engineering.