Study On Security Protective Coal Pillar Mining Influence On The Stability Of Floor Blind Incline Shaft Surrounding Rock

The article applies the methods of theoretical analysis, numerical calculation and numerical simulation, studies the security protective coal pillar mining influence on the stability of floor blind incline shaft surrounding rock. Firstly, based on the theory of elasticity, according to the mining of protective coal pillar and mining process in two states, are built stress model along coal seam strike and along the tendency to coal, obtain the floor at an arbitrary point stress expression. Using elastic-plastic theory, it is derived that the static pressure and dynamic pressure roadways under conditions of stress and displacement of surrounding rock and the plastic zone, combine the Xieyi mine engineering geological conditions, and calculate the protective coal pillar mining and blind inclined shaft surrounding rock plastic zone. In the face of numerical simulation, by using the FLAC3D geotechnical engineering simulation software analyzed the rock bottom distribution rule of before and after the protective coal pillar stress, and analyze the characteristic influence low of floor stress distribution of the angle of coal seam inclination. Combining the Xieyi mine engineering geological conditions, it is established that a blind inclined shaft protective coal pillar numerical calculation model, analyze the rock stress distribution and plastic failure characteristic of blind incline shaft under the influence of protective coal pillar mining. By testing the field blind inclined shaft surrounding rock displacement variation, it is obtained that the dark slope mine strata pressure rule about the protection coal pillar. Combining with theory analysis and numerical results, it put forward inside slope rock maintenance plan, ensure the protective coal pillar during normal use of the blind incline shaft, it also verifies that the theoretical analysis and numerical simulation conclusions are correct. Therefore, the results of theoretical analysis and numerical simulation results can provide a theoretical reference for the scene, and similar conditions of roadway surrounding rock stability control also has a certain reference value.