采场底板断层防水煤柱留设研究

STUDY ON DESIGN OF SAFETY PILLAR AGAINST WATER-INRUSH THROUGH STOPE SILL FAULTS

采场断层防水煤柱的合理留设关系到煤矿安全较大,其留设不仅要考虑断层本身的性质,还应考虑矿山压力这个因素。采场附近煤体划分为弹性区和非弹性区,但非弹性区不具有隔水性能。根据采场支承压力的分布特征,推导出非弹性区范围的计算公式;根据推进方向上采场底板应力分布特征,应用计算机模拟矿山压力高峰应力在底板中传播的方向,建立采场底板突水的力学模型,得出底板水通道是由断层和被矿山压力破坏的底板岩层联合组成的结论。其突出的条件为:煤层开采造成的底板破坏深度不小于底板高峰应力线与断层交点的深度。在此基础上推导出采场断层防水煤柱留设计算公式,并用实例验证该公式的合理性。

The rational design of safety pillar against water-inrush through stope sill faults is very important to the safety of coal mines. The characteristics of faults and the underground pressure are considered in the design. The coal body around mining area can be divided into two parts., the elastic area and the non-elastic area, where the latter does not have water-resisting function. The formulas to calculate the range of non-elastic area are deduced according to supporting pressure distribution characteristics. Based on the floor stress distribution characteristics in the direction of face advance, the developing direction of peak stress for underground pressure in floor is simulated and the mechanical models of water-inrush from floor are constructed. The results show that the passageway of water-inrush from floor consists of fault and broken floor strata caused by underground pressure. The condition of water-inrush from floor is that the depth of broken floor strata, caused by underground pressure, is not less than that of the join of peak stress line of underground pressure against water-inrush from faults are achieved according to reasonable. in floor with the fault. The formulas to design safe pillar above results and a case study shows that the formula is