| The proportion of the large inclined angle in medium-thickness seam are occupied our country mine resources, including focusing on studies of special research on reserve-width and achievement. Yet there are some distance in practicability from spread and applied.From the benefit of the guidance field and applied, combing the field test and analysis of press variation in Dongbaiwei coal mine pillar. On the one hand, whether the reserve-width of section coal pillar is apt or not, the major standard that the return airway to be applied safety, can not judge the whether the coal seam destruct simply or not. On the other hand, double-sided goaf can be substituted by one-sided, and analysis of the reserve-width in section coal pillar, according to rock mass level and the description of quality sensuality character in GB50218-94 project, considering the top plate completeness and flexibility, the engineering rock can divide into stability and instability, further considering the category of roof and floor rock stability, the relation of lane and coal seam. The large dip-medium thick coal seam mining gateway can divide into six types, according to Mohr-Coulomb Rule and Kastner Equation derived to the coal reserve-width theory calculation formula.Set the 36# mine section coal seam reserve-width an example, based on analysis of the coal hosting geological conditions, it confirmed theⅢtype. And it processes the rock machine parameter determination in laboratory, numerical simulation and some specific parameter calculation. On the condition of safety, the verification in industrial field test of -300 working face, the coal pillar reserve–width decrease from 25 meter to 8 meter, which proves the theory and creates a direct economic benefit up to 5million yuan as well.The research results not only promote the study of coal seam reserve-width of certain reference value, but also guide the field production of vital practical value.
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