浅埋煤层局部充填开采上行裂隙发育高度研究

Research on the Height of Upward Crack Development in Partial Backfill Mining of Shallow Seam

采用长壁局部柔性充填开采方法是实现浅埋煤层特殊保水开采的有效途径,通过走向长壁局部充填开采的物理相似模拟实验,分析了等间距充填2条带情况下隔水岩组的稳定性规律,得出了在充填体强度、弹性模量不变的情况下,不同的充填间隔宽度和充填宽度直接影响上行裂隙的发育高度,最终影响隔水岩组的稳定性。基于物理相似模拟实验,建立了特殊保水开采区局部充填隔水岩组稳定性力学模型,确定了上行裂隙发育高度计算公式。

The longwall partial flexible filling mining method is an effective way to achieve water conservation mining in shallow seam. This article carried out the strike longwall mining physical simulation experiment, analyzed the stability law of impermeable rock group under space filling two strips. The conclusion showed that different filling space width and filling width would directly affect the upward crack development height and the stability of impermeable rock group under the invariable conditions of filling body strength and elastic modulus. Based on the physical simulation experiment, the article set up a stability mechanical model for special water conservation mining area partial filling impermeable rock group, and determined formula of upward crack development height.