Research On Detection And Dynamic Analysis Method Of Small-Scale Geological Structures Incoal Mining Panel

The gas occurrence is influenced by small-scale geological structures.Small-scale geological structures(such as gaseous fluid properties in structure fracture and stress field properties)and the seepage field of gas may change during the process of coal mining.Therefore,it is of great significance in both academic research and practical application to research on the detection and dynamic analysis method of small-scale geological structures in coal mining panel.Based the idea of detecting small-scale structures by gas drainage boreholes in coal seam,the prediction method of small-scale structures with the main predictors of coal seam floor(roof)3D surface map,coal seam floor(roof)contour map,coal seam floor(roof)trend surface residual map and dynamic phenomena is established,and then the user interface function prediction system of small-scale structures in coal seam is designed and developed by the MATLAB software.The evolution regularities of stress field near small-scale structures in coal seam during the process of mining is revealed by numerical simulation and theoretical analysis: the stress field enhances and decreases gradually near different occurrence of small-scale geological structures as a result of the superposition of tectonic stress field and mining-induced stress field,and magnitude of stress value or stress concentrated area is controlled by the direction of coal mining,orientation of the maximum horizontal princal stress,type of geological structures,and occurrence of geological structures;There is a sudden change of mining-induced stress in the coal seam thickness change band.The dynamic analysis method for gas outburst hazard near the small-scale geological structures in coal mining panel is propound based on the above,and the main analysis procedure is as below: analysing regularities of regional and mine gas geological;the prediction of small-scale structures and primary stress direction of in-situ stress field in coal mining panel;the simulation analysis of stress field and the prediction of gas outburst hazards near the small-scale geological structures.The contents of this article has deepened the gas geological theory,enriched gas geological analysis method,and also open a new idea for prediction of gas outburst hazards.