Study On Reasonable Retention Of Jinjitan Coal Mine Working Face Of Section Coal Pillar Under The Condition Of Large Mining Height

Jinjitan coal mine 2-2coal is fully mechanized mining,The problem of the size of coal pillar is one of the important factors that restrict the safe and efficient production of the mine.Therefore,of Jinjitan mine 2-2 coal working face reasonable section coal pillar design research,not only to improve the recovery rate of coal resources have important significance,but also to continue the reasonable working face of section coal pillar design and provide a theoretical basis.At the same time,research results in Yushen mining area similar engineering geological conditions of the mine has extensive application value.In this paper,In Yushen mining area in Jinjitan coal mine 2-2 coal working face with large mining height of coal pillar as the main research object,through theoretical analysis calculation,field test,numerical simulation and on-site industrial test a variety of research tools,of section coal pillar reasonable design in-depth study.The deformation of coal pillar and the distribution of stress in coal pillar are analyzed and studied.The design scheme for Jinjitan coal mine 2-2coal mining face with large mining height rational section coal pillar.Practice shows that: under the condition of constant support condition,the section coal pillar according to 25m(solid coal width)is stable and reasonable,which can ensure the normal production of working face.The research results to solve the 2-2 coal working face of Jinjitan coal mine section coal pillar remaining reasonable design of technical problems,also under the similar conditions in the future of section coal pillar design reasonable retainment of accumulated experience.