平顶山矿区深部巷道围岩蝶形破坏机理及控制对策

Butterfly Failure Mechanism of Surrounding Rock and Control Measures in Deep Roadway of Pingdingshan Mining Area

以平煤六矿戊二轨道上山为工程背景,通过理论分析、数值模拟和现场试验等方法,对巷道围岩变形和破坏特征展开深入研究,阐明了巷道围岩蝶形破坏机理:受工作面开采扰动的影响,临近巷道的围岩应力场重新分布,围岩主应力方向旋转使蝶形塑性区的方向发生改变,致使巷道顶底板和两帮中部塑性区的深度增加,极易发生"蝶叶"型冒顶、片帮和底鼓等灾害.基于蝶形破坏机理,有针对性地提出新支护方案,通过对比,在支护效果上,新支护方案比原支护方案有了明显的提升,基本满足巷道使用需求.

Taking the Pingmei No.6 Mine’s No.2 track uphill as the engineering background,through theoretical analysis,numerical simulation and field test,the in-depth study on the deformation and failure characteristics of the surrounding rock of the roadway was carried out.The butterfly failure mechanism of the surrounding rock of the roadway was clarified:the stress field of the surrounding rock near the roadway was redistributed due to the mining face disturbance.The rotation of the principal stress direction of the surrounding rock changes the direction of the butterfly plastic zone.As a result,the depth of the roof and floor of the roadway and the plastic zone in the middle of the two gangs increase,and disasters such as"butterfly"type roof fall,flank and bottom drum were extremely prone to occur.Based on the mechanism of butterfly failure,a new supporting scheme was proposed in a targeted manner.By comparison,the new support scheme had significantly improved the support effect compared with the original support scheme,and basically meets the needs of roadway use.