庞庞塔矿综放沿空巷道煤柱应力分布与变形特征研究

Study on stress distribution and deformation characteristics of coal pillar along gob roadway in Pangpangta Mine

以庞庞塔矿综放沿空巷道为工程背景,采用现场调研、理论分析、数值模拟的方法,分析了综放面沿空巷道基本顶岩层破断机制,指出单一采动和重复采动工作面基本顶破断机制的差异性和相关性,研究了不同煤柱宽度下综放沿空巷道煤柱应力分布与变形特征,研究表明,一定范围内增加煤柱宽度可有效改善煤柱承载性能,减小沿空巷道变形,当煤柱宽度一定时,煤柱具备一定的承载能力,在上工作面侧向支承压力的作用下,煤柱整体向沿空巷道移动,造成沿空巷道煤柱帮变形量加大,据此确定了庞庞塔矿10#煤层工作面煤柱宽度为8~10m,为后期矿井煤柱宽度和支护技术的确定提供参考。

In mine roadway driving along goaf roadway Pangpangta as the engineering background,the field investigation and theoretical analysis,numerical simulation method,analyzed the deformation-failure along goaf roadway roof breakage mechanism,points out that single mining and repeat mining working face roof breakage mechanism of the difference and correlation,based on this,different coal pillar width is studied under the stress distribution and deformation characteristics of roadway driving along goaf roadway pillar,studies have shown that a certain range increased width of coal pillar can effectively improve the bearing performance of coal pillar,decrease along the empty roadway deformation,when the coal pillar width must have a certain carrying capacity,and coal pillar under the action of lateral abutment pressure in working face,The coal pillar moves towards the goaf roadway as a whole,resulting in the increase of deformation along the goaf roadway.In summary,the width of the coal pillar on the working face of No.10 coal seam in Pangpangta mine is determined to be 8~10m,which provides reference for the determination of the width of the coal pillar and support technology in the later stage of the mine.