深井高应力巷道支护参数优化研究
Study on Support Parameters Optimization of High Stress Roadway in Deep Mine
-
摘要: 为解决深部高应力巷道支护困难的问题,在分析深井多煤层联合开采过程中巷道受上部煤柱及采动影响特征的基础上,系统分析了高应力巷道矿压显现及支承压力分布规律。结果表明,锚杆支护系统应该保证围岩处于弹性或弹塑性范围内,且其变形特性必须适合围岩变形特性的要求。据此提出采用让压锚索和让压锚杆支护技术,工程实践表明:采用让压支护技术后巷道变形量减小50%左右,顶底板平均移近速度为4.32 mm/d,两帮平均移近速度为2.70 mm/d,有效控制了深部高应力巷道围岩变形。Abstract: In order to solve support difficult problems of the high stress roadway in a deep mine, based on the analysis on the mine roadway features during the mu Iti seam combined mining process affected by the top seam coal pillars and mining induced, the paper systematically analyzed the mine strata pressure behavior and th e support pressure distribution law of the mine high stress roadway. The analysis results showed that the bolt support system should ensure the surrounding rock in an elastic an a elastic plastic scope and the deformation features of the support system should meet the requirements of the surrounding rock deformation features. Theref ore, a yield anchor and yield bolt support technology was provided. The engineering practices showed that with the application of the yield support technology, the defor mation value of the mine roadway was reduced about 50%, the average convergence rate between the roof and floor was 4. 32 mm /d, the average convergence speed between the two sidewalls was 2.70 mm /d and the surrounding rock deformation of the high stress roadway in the deep mine was effectively controlled.