条带充填保水开采隔水岩组力学模型研究

Study on mechanical model of aquifuge beam supported by filling strip in the water preserved mining

根据特殊保水开采区典型条件,针对2个等间距充填条带的隔水岩组稳定性进行了物理模拟实验和理论分析,提出了条带充填隔水岩组弹性基础梁力学模型,给出了充填条带压缩量和隔水岩组的挠度计算公式,确定了下行裂隙的位置和发育深度。基于隔水层稳定性判据,提出了合理的充填间隔宽度和充填条带宽度计算方法。结果表明,合理的充填条带宽度和充填间隔宽度主要与充填条带压缩率、隔水岩组厚度与强度及采高有关,充填间隔宽度随隔水岩组厚度、强度和采高的增大而增大,下行裂隙的发育深度随充填条带压缩量的增大而增大。

According to the typical conditions of special water preserved mining area, the aquiclude stability with two equispaced filling strips has been analyzed through the physical simulation experiment and theoretical analysis. The elastic foundation beam model of aquiclude supported by the strip filling has been set up, and the compression displacement of the filling strip and the deflection formula of the aquiclude beam have also been put forward. Furthermore, the position and depth of the downward crack have been determined. Based on the aquiclude stability criterion, the calculation method of reasonable filling strip width and interval width has been determined. The result has shown that the reasonable strip interval increases with the increase of the mining height, the thickness and strength of the beam. The depth of the downward crack mainly develops with the increase of the strip compression displacement.