Optimization And Control Technology Of Coal Pillar Size In Roadway Along Fully Mechanized Caving Face Based On Creep

The roadway along the goaf is the way of using small coal pillars to protect the roadway.At home and abroad,the mechanism of surrounding rock failure in the roadway along the goaf has been studied at home and abroad.Only by mastering the law of change can scientific and effective preventive measures and methods be used to control the roadway.Problems such as large deformation,instability,and slump occur.This paper takes the track of the 7112 working face of Tianchen Coal Mine as the engineering background,and uses the research methods of rock mechanics test,theoretical analysis,numerical simulation and field measurement to analyze the creep failure mechanism along the roadway and the coal pillar along the roadway.Dimensions,types and roadway support parameters.(1)Through the rock mechanics test,the main roof,direct roof,coal compressive strength and creep failure law of the 7112 working face were obtained.(2)Through theoretical analysis,the creep failure characteristics of surrounding rock in gob-side excavation are introduced,and the factors affecting the layout and stability of roadway along the goaf are analyzed,and the factors affecting the location and stability of the roadway along the goaf are revealed.According to the theory.The formula determines the reasonable size of the coal pillar to be 6 m.Finally,the relationship between the stability of the coal pillar and the long-term creep of the coal body is discussed.(3)Using numerical simulation to study the distribution pattern and law of roadway displacement and roadway plastic zone during roadway excavation and working face mining,provide basis for determining the support parameters of roadway,and ensure the stability of roadway..Through numerical simulation of three different width coal pillars and different supporting parameters,the optimal width of coal pillar is 6m and reasonable supporting parameters are obtained.(4)After verification by engineering practice,the roadway support scheme can effectively control the surrounding rock deformation when the bearing displacement of the 7112 working surface track is affected by the working face and the goaf of the 7110 working face,indicating that 6m coal is used in this paper.The column scheme is completely reasonable and feasible to carry out the roadway along the air.