深井孤岛工作面巷道围岩采动应力分区演化特征

针对深井孤岛工作面煤巷大变形问题，采用现场实测手段研究了回采过程中巷道和采空区应力动态演化规律以及巷道围岩变形破坏演化特征。研究结果表明：深井孤岛工作面巷道围岩应力演化与变形破坏具有显著的阶段性特征，工作面前方大于250 m范围，巷道围岩未受采动影响，围岩应力变化较小且变形主要集中在底板与煤柱肩窝；工作面前方100～250 m支护结构受力增大，巷道浅部围岩破碎，顶底板移近及煤柱内挤变形突出，巷道出现明显的非对称变形破坏；工作面前方100 m为强烈采动影响阶段，尤其是在工作面前方20～22 m围岩垂直应力与空间主应力变化比较剧烈，顶底板移近与两帮内挤变形更加突出，巷道围岩表现出明显的大变形破坏特征。根据采空区应力分区特征分析了顶板覆岩结构的动态演化过程。结合应力与变形破坏演化特征，提出了巷道支护对策，以期为深井巷道围岩控制提供一定指导。

Evolution characteristics of mining-induced stress partition of roadway surrounding rock on working face of deep island

Aiming at large deformation of roadway on working face of deep island mining, the dynamic evolution law of the stress in roadway surrounding rock and goaf are studied by means of field measurement, and the evolution characteristics of deformation and failure of surrounding rock are analyzed. The results show that the stress evolution and deformation failure of surrounding rock on working face of deep island mining have obvious stage characteristics, when the distance from the working face is more than 250 m, the surrounding rock of the roadway is not affected by mining, so the stress of surrounding rock changes little, and the deformation is mainly concentrated in floor and coal pillar. The stress of the supporting structure is increased obviously in the range of 100?250 m in front of the working face, the shallow surrounding rock of the roadway is broken, and the coal pillar is squeezed and deformed, which causes the roadway to appear the obvious asymmetric deformation and failure. In the range of 100 m in front of the working face, the stage of strong mining influence occurs, especially in the range of 20?22 m in front of the working face, the vertical stress and space principal stress of the surrounding rock change more significantly, the roof and floor moving closer and the both sides of roadway deformation more prominent, which make the surrounding rock of the roadway shows obvious large deformation and failure characteristics. According to the characteristics of stress zoning in goaf, the dynamic evolution process of the covering rock structure is analyzed. Combined with the evolution characteristics of stress and deformation, the reform suggestions of roadway support are proposed to provide some guidance for the control technology of roadway surrounding rock in deep mine.