不同埋深大采高综放采场围岩变形机理研究

Mechanisms of Surrounding Rock Deformation with Different Buried Depths and Heights

目的厚松散层、薄基岩、特厚煤层地质条件下采场围岩控制是煤矿向西部开发亟需解决的难题之一。研究西部特殊地质条件下的围岩变形控制机理,对大采高综放工作面围岩控制具有实际的指导意义。方法以不连沟煤田资源开采地质条件为背景,采用3DEC大型离散元软件,建立数值计算模型。结果系统研究了工作面埋深对采场围岩的变形破坏规律和应力分布特征的影响规律,揭示了大采高综放采场围岩变形机理。结论工作面中部围岩水平位移较小、垂直位移较大,两端头围岩水平位移较大、垂直位移较小;采场围岩水平应力峰值和垂直应力峰值随埋深逐渐增大,采场围岩的垂直应力峰值大于水平应力峰值。

Objective The control of the surrounding rock under the condition of thick unconsolidated layers,thin bedrock and extremely thick coal seam is one of the urgent problems to be solved in the development of coal mine to the West.The study on the control mechanisms of surrounding rock deformation under special geological condition in the west of China is of practical guiding significance to the control of surrounding rock of large mining height of fully mechanized top coal caving face.Methods Based on the geological conditions of buliangou coal mine,and using 3DEC large discrete element software,a numerical calculation model was established.Results The surrounding rock deformation and failure law and stress distribution characteristic of different buried depths of working face were systematically studied.Conclusion The results revealed the surrounding rock deformation mechanisms of the working face by large mining height of fully mechanized top coal caving:the surrounding rock in the middle of working face has small horizontal displacement,and larger vertical displacement;the surrounding rock at both ends of working face has large horizontal displacement,smaller vertical displacements;horizontal stress peak value and vertical stress peak value of stope surrounding rock increases with buried depth,and vertical stress peak value of the stope surrounding rock is greater than horizontal stress peak value.