The Numerical Simulation Analysis Of The Coal And Gas Outburst Based On The Physical Simulation Experiment

Based on the comprehensive role hypothesis of coal and gas outbursts,the paper used the large-scale physical simulation test system for multi-field coupled coal mine dynamic disasters independently developed by Chongqing University to systematically develop the coal with non-uniform distribution of “three zones” in front of the in-situ stress of the mining face.With the gas outburst physical simulation test,and on the basis of the use of COMSOL multiphysics data simulation software,a numerical simulation method for the temporal and spatial evolution of gas pressure in coal seams and gas outbursts was proposed,and the state of the gas source and the ground stress was systematically analyzed.The influence of factors such as initial gas pressure,coal seam permeability on the temporal and spatial evolution of gas pressure in coal seams and gas outbursts.Its main research work and the research results obtained are as follows:(1)Using data processing software MATLAB and OriginLab et al.,the optimization analysis of coal and gas outburst physical simulation test data from different angles was carried out,and a set of data analysis methods was established to perform point,line,surface,and volume systems on the data.Through the analysis of the measuring points,it is found that the gas pressure at the measuring points near the protruding mouth changes the fastest,and the pressure changes in other areas are relatively time-delayed;the line analysis and surface analysis results show that the gas pressure changes in an inverted U shape.The results of volume analysis and body analysis further confirm the analysis of the line surface,showing that the gas pressure changes to the shape of the horn,which conforms to the classical gas pressure distribution of the shell and shell.(2)Through the comparative analysis of the results of physical simulation test data,the reliability of the numerical model of coal and gas outburst was verified.Comparing the data of the corresponding measurement points can be obtained,the data results calculated by the established data model are consistent with the data of the physical simulation test,and have a high degree of matching;the comparative analysis of the gas pressure diagram of the main longitudinal surface at the same time,generally The trend of change is the same,but numerical values are more ideal.(3)Using the established numerical simulation model and referring to the prominent influencing factors in the hypothesis of coal and gas outburst comprehensive action,the corresponding numerical calculation groups were established for the four conditions of gas source,ground stress,gas pressure,and permeability.The numerical simulation results show that gas pressure changes to a semi-U shape under the condition of gas source supplementation;the smaller the ground stress,the greater the gas pressure,and the higher the permeability,the faster the gas pressure.