采空区上覆松散隔水层淤堵自修复技术

Clogging and Self-repairing Technology for Loose Aquifuge Above Goaf

以采空区上覆松散介质为研究对象,研究松散介质淤堵自修复机理并成功应用该技术。结果得出:松散隔水层淤堵自修复主要受流量、携沙量及悬移质粒径影响;流量太大易冲蚀松散隔水层;流量缓慢、携沙量大时,易于隔水层淤堵自修复;粒径小于0.075 mm的颗粒,利于采空区上覆松散隔水层淤堵自修复;淤堵自修复模式为表面-内部双重淤堵,表层淤堵的效果更明显;淤堵自修复效果与淤堵时间成正比,淤堵时间越长,渗透系数越小,效果越明显。

Taking the loose medium above goaf as the research object, the mechanism of self-repairing of blockage of loose medium was studied and the technology was successfully applied. The clogging and self-repairing technology for the loose aquifuge was mainly affected by flow, sediment load and suspended sediment size. If the flow is too large, the loose aquifuge is washed off.When the flow rate is slow and the sediment load is large, it is easy to clog and self-repair for the loose aquifuge above goaf.When the particle size is less than 0.075 mm, it is conducive to the clogging and self-repairing technology. The type is surfaceinternal clogging and surface clogging effect is more obvious. The effect of the clogging and self-repairing technology is proportional to clogging time. The longer the clogging time is, the smaller the permeability is, and the more obvious the effect is.