麻家梁煤矿临空巷道围岩大变形控制技术

Control Technology of Surrounding Rock for Large Deformation ofgob-side roadway in Majialiang Mine

针对麻家梁煤矿14102辅助运输巷即临空强动压巷道,受相邻工作面采动影响,顶底板接近闭合,采取了多形式补强支护措施,巷道大变形仍未得到有效控制,通过分析工作面双硬顶板"下位短悬臂梁与上位长砌体梁"结构,监测工作面侧向支承应力和移动支承应力分布规律,发现工作面后方双坚硬顶板垮落形成的强烈采动支承应力(强度大和范围广)是导致现有19.5 m区段煤柱条件下临空巷道持续大变形的根本原因。工业试验表明,综合采用超前顶板水压致裂配合巷内让压支护的围岩控制技术,14202辅助运输巷两帮最大移近量约为0.6 m,平均移近量约为0.4 m,平均底鼓量约为1 m,有效控制了强动压巷道的大变形问题。

Aiming at 14202 auxiliary roadway of Majialiang Mineiniluenced by the mining dynamic pressure on adjacent working face, the top floor close to close, the multi-form reinforcement and supporting measures being adopted, the large deformation of the roadway has not been effectively controlled. By analyzing the structure of the ＂lower short cantilever beam and the upper long masonry beam＂ and the distribution law of the side abutment pressure and the moving abutment pressure of the working face, the strong abutment pressure （ large intensity and wide range ） caused by the collapse of the hard roof is the fundamental cause of the continuous large deformation of the existing roadway under the condition of 19.5 m coal pillar. The industrial test shows thatthe surrounding rock control technology combined with the advanced roof hydraulic fracturing with yielding support, the maximum displacement of sides about 0.6 m, the average displacement about 0.4 m, the average heave amount about 1.0 m, effectively controlls the large deformation of the dynamic pressure roadway.