Study On InSAR Technology Monitoring And Identifying Mine Fault Deformation

With the rapid development of the national economy,the number of "three unders" coal pressure has also increased,leading to the shift from simple easy mining areas to areas with complex geological structures in the production planning of most mine production units.Therefore,the influence of the working face in the mining process will inevitably spread to the fault plane.The study of the abnormal surface deformation law induced by the fault provides a theoretical basis and reference basis for the rational planning of the mining face and the protection of surface structures.This article mainly focuses on the special movement law under the fault structure in the mining area,using InSAR technology as the research method and Fengfeng mining area as the engineering background,through theoretical analysis,model construction,simulation experiment,case analysis and other main research ideas on the surface under the influence of the fault.Research and explore the characteristics of deformation anomaly recognition and the law of surface movement.The main work content and results are as follows:(1)Analyzed the basic characteristics of mining subsidence in mining area and the fuzzy line of sight of InSAR technology in the deformation monitoring of mining area.Aiming at this problem,a three-dimensional solution method combining mining subsidence law in mining area is proposed,which uses the difference between the horizontal movement caused by mining.The functional relationship of is used as a constraint to construct three-dimensional deformation solution model.The accuracy of the method is verified by the simulated three-dimensional deformation field.The results show that the root mean square error of the solution results of horizontal movement in east-west direction,horizontal movement in north-south direction,and vertical sinking are: 11.23 mm,8.76 mm,15.32 mm,respectively.(2)Combined with the time-space analysis method of mining area subsidence,based on the time-series InSAR monitoring results,the time-space characteristics and response relationship of surface deformation are studied.The temporal characteristics of surface deformation are analyzed through the time-sinking curve of surface points.The surface subsidence indirectly affected by fault activation is shown as discontinuity,and its value is related to the activation degree of the fault;the spatial characteristics of surface deformation are monitored by InSAR surface information the research area are analyzed globally,and the development process of the surface deformation in the area affected by the fault is discussed.The settlement gradient is calculated through the normalization of the results and the damage area of the surface building is delineated;the response relationship between underground mining and surface deformation is work When the surface is 160 m away from the fault,the fault begins to activate under the influence of mining,and during the advancement of the working face,the surface deformation in the area indirectly affected by the fault has hysteresis.(3)Combined with the time-space analysis method of mining area subsidence,based on the time-series InSAR monitoring results,the time-space characteristics and response relationship of surface deformation are studied.The temporal characteristics of surface deformation are analyzed through the time-sinking curve of surface points.The surface subsidence indirectly affected by fault activation is shown as discontinuity,and its value is related to the activation degree of the fault;the spatial characteristics of surface deformation are monitored by InSAR surface information the advantages of the research area are analyzed globally,and the development process of the surface deformation in the area affected by the fault is discussed.The settlement gradient is calculated through the normalization of the results and the damage area of the surface building is delineated;the response relationship between underground mining and surface deformation is work When the surface is 160 m away from the fault,the fault begins to activate under the influence of mining,and during the advancement of the working face,the surface deformation in the area indirectly affected by the fault has hysteresis.(4)After mining,the internal movement characteristics of the overlying rock follow the principle of space conservation as a whole,combined with the mechanical theory of rock strata control,to discuss the rock beam mechanics model in the presence or absence of faults.It is impossible to restrain the free rotation of the beam end to produce bending and fracture.When the inclination angle of the fault plane is greater than the collapse angle of the rock layer,the rock mass will tilt under the action of the upper load and its own weight and form a separation space on the fault plane.The separation space will be further reduced.The deformation is transmitted to the surface,and abnormal deformation occurs.By constructing a geometric model of the separation space,the main factors affecting its size are obtained: the thickness of the coal seam,the inclination of the coal seam,the mining depth,the inclination of the fault,and the width of the protective coal pillar.