水体下急倾斜煤层采空区矸石充填顶板控制

Roof control effect for gangue backfilling of goaf in thin steeply inclined seam under water body

采用数值计算和物理模拟方法,分析了水体下急倾斜煤层开采采空区矸石自溜充填顶板控制效果。结果表明:采空区矸石充填可以有效降低工作面顶板下沉挠度,减小区段平巷围岩变形;矸石充填限制了相邻分带煤柱的横向变形,减小其变形破坏程度以及降低相邻分带回采时的矿压显现;矸石充填使覆岩内的应力发生转移和重新分布,有效降低了覆岩导水断裂带的高度,减少了防水煤柱的塑性破坏范围。

Numerical calculation and physical simulation methods were used to analyze the roof control effects of gangue self-rolling backfilling in the goaf of steeply inclined seam under water body.The results show that：subsidence deflection of roof and deformation of surrounding rock in section gallery can be effectively decreased by gangue backfilling;gangue backfilling can limit the transverse deformation of adjacent zoning pillar and reduce its failure deformation and strata behaviors degree when mining adjacent coal face;gangue backfilling technology in the goaf of steeply inclined coal seam can decrease the height of water-flowing fractured zone and plastic zone of waterproof coal pillar as well as transition and redistribution of stress in the mass.