Study On The Gob-side Entry Driving Along The Goaf Under Special Thick Key Conditions Of Ma Daotou Coal Mine

Aiming at the narrow space-time interval conditions of the roadway driving along the gondola of the 5211 channel in the Madaotou Coal Mine of the same coal group,the theoretical analysis and calculation,field measurement,numerical simulation and laboratory experiments are used to narrow the narrow and thick roads.Systematic research on time-space interval,reasonable coal pillar width and surrounding rock control technology has achieved the following research results:(1)Based on the arrangement of the roadway along the goaf of the narrow coal pillar of Madaotou Coal Mine and the geometrical mechanical parameters of the coal and rock mass,establish a mechanical analysis model for the stability of the narrow coal pillar in the typical fully mechanized caving section,and calculate the goaf side and section level in the narrow coal pillar.The theoretical value of the reasonable width of the narrow coal pillar in the typical fully mechanized caving section is obtained from the width of the plastic zone on the side of the roadway.(2)Describe the dynamic evolution process of bearing pressure caused by mining face mining,analyze the influence range and peak distribution characteristics of lateral bearing pressure in different stages of overlying strata movement,so as to determine the requirements for driving along goaf after mining in adjacent working face.The shortest interval.(3)The numerical simulation scheme for designing the asymmetry supporting parameters of the anchor(rod)cable of the narrow coal pillar along the goaf,and analyzing the mutual feeding relationship between the anchoring parameters of the anchor(rod)and the surrounding rock deformation and failure along the roadway.Based on this,the roof anchor(rod)cable support parameters are determined.(4)Summarize the deformation and failure laws and control effects of surrounding rock in the narrow coal pillars of extra-thick coal seams,and evaluate the scientific design of the overall mining arrangement,reasonable time interval and coal pillar width design and the reliability and control effect of the support system.There are 26 figures,6 tables,81 references.