断层保护煤柱下采煤工作面保留巷道破坏分析及其控制

针对布尔台煤矿2-2煤断层保护煤柱下方4-2煤开采导致其保留巷道产生剧烈变形破坏的情况,通过现场实测、理论分析、数值模拟等方法对断层保护煤柱下采煤工作面保留巷道的破坏特征及致灾机理进行了研究。研究表明:①保留巷道变形破坏区域性特征明显,断层保护煤柱下更为剧烈,超前影响范围可达100 m;②多次采动造成断层保护煤柱下保留巷道位置处垂直应力叠加和水平应力卸,最大垂直应力为原岩应力的1. 8 倍,水平应力普遍小于原岩应力;③多次采动后,保留巷道塑性区在煤柱下方可达2 ~3 m,在采空区下方多在1 ~1. 5 m。针对性地提出水压致裂并结合锚索补强支护的治理方案,效果良好。

Failure analysis and control of retained roadway at working face under protection coal pillar of the faults

Aiming at the severe damage at retained roadway of coal seam 4-2 working face in Buertai coal mine,which is under 2-2 coal seam protection coal pillar of the faults,the failure characteristics and disaster mechanism of retained roadway under the protection coal pillar of faults were studied by means of field measurement, theoretical analysis and numerical simulation. Researches show that:①The deformation and failure of retained roadway are obviously regional,which is obviously more severe under the protection coal pillars of the faults;②Multiple mining operations result in different superposition and unloading of vertical and horizontal stresses,the maximum vertical stress being 1. 8 times of that under the protection coal pillar of the faults. ③After repeated mining,plastic zone of retained roadway under the coal pillar is 2 ~3 m,while it is about1 ~1. 5 m under the goaf. The measures of hydraulic fracturing and anchor cables support are put forward,which has been proved effective