摘要
根据淮南矿区大倾角(25°~45°)煤层开采地质和技术条件,采用物理模拟综合分析了大倾角煤层回采巷道围岩结构特征及采用锚杆支护时的围岩变形、破坏、应力演化等力学特征,揭示了大倾角煤层回采巷道围岩力学特征非对称演化机理。研究表明,实体煤回采巷道应重点支护顶板和高帮,而留小煤柱回采巷道应重点支护顶板和低帮。基于巷道围岩力学特征的非对称性,提出并实施了大倾角煤层实体煤回采巷道和留小煤柱回采巷道的非对称锚网索支护方法。工程应用表明,非对称锚网索支护能适应大倾角煤层回采巷道围岩结构和力学特征,有效控制巷道围岩变形。
According to geological and technical conditions of large dip coal seams (LDCS) whose angle is from 25° to 45° in Huainan Coal Mine, a physical model was used to simulate configuration and mechanical characteristics of roadway with bolt supporting, such as patterns of deformation, displacement, failure, and mining-induced stress (MIS) of surrounding rock. It revealed the unsymmetrical mechanism of mechanical characteristics of surrounding rock of retreating entry in large dip coal seams. Study result shows that additional support needs to be implemented for different sections of roadway. The roof and upper-fib of solid roadway are the main supporting section but, the road- way of gob-side with small width pillar, the roof and lower-rib are the key sections. So considering the dissymmetrical strata behaviors and mechanical characteristics, the asymmetrical bolting support technique (ABST) was put forward and implemented. The engineering practice shows that ABST is suitable and reliable for controlling rock stability in LDCSs mining.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第4期924-927,933,共5页
Chinese Journal of Underground Space and Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB226806)
安徽理工大学优秀创新学术团队资助项目
重庆大学访问学者基金
关键词
大倾角煤层
回采巷道
非对称锚杆支护
围岩稳定性控制
large dip coal seam
retreating entry
asymmetrical bolting support
rock stability control