Analysis Of The Law Of Surface Rock Movement Of Coal Mine Goaf In Northern Shaanxi

This paper takes the mine goaf of Shagoucha Coal in Fugu County as the object of research.Based on the collection of past geological data and field surveys,Expand the study of the characteristics of the movement and deformation of overlying rocks and ground surface in the goaf.On the basis of setting up actual observation points to Observe the movement and deformation of the ground surface.Then by using the probability integral method to Calculate,analyze and predict the surface movement and deformation values in the study area.Finally use FLAC3 D in this example to Simulate and analyze the deformation and movement during mining.Got the following result:(1)The thesis takes the mining of 520105 working face of Shagoucha Coal Mine as the research object,Based on the observation and analysis of the surface movement of 520105 working face during mining,analyzing the movement of rock by using probability integral method.Thus,obtained the rock movement parameters and the surface rock movement deformation law of Shagoucha Coal Mine,and predicted the surface subsidence.(2)Using FLAC3 D as the software for numerical simulation,By analyzing the stratum conditions of the area where Shagoucha Coal Mine is located,Physical and mechanical index of rock layer and The angle of influence of the mining range obtained before Propagation angle and rock layer thickness,so the constitutive model and initial conditions suitable for this simulation and the geometric size of the model were determined.During the simulation process,set up monitoring points in the coal seam,thereby obtained the change cloud picture and change curve of the monitoring point.Through observation and analysis of the amount of sinking at the monitoring point,obtained the cloud map of subsidence displacement and the curve of subsidence displace-Ment,obtained the general law of surface subsidence deformation.Similarly,based on the study of the cloud diagram of the horizontal displacement of the observation point and the change curve of the horizontal displacement,obtained general laws on horizontal deformation of the surface.Finally,after getting thesimulation results,compare the obtained simulation results with the results obtained by the probability integral method to determine the reliability of the mathematical calculation results.