煤田巷道防水侵水泥浆材的封堵试验

Sealing Test of Waterproof Cement Slurry Material in Coalfield Tunnel

摘要:

井下巷道掘进仍然是地下煤炭开采的主要方式，在开采过程中必然要穿过一些断裂地层带以及无胶结的松软地层及煤层顶板上的含水层。在掘进过程中，如果处理不当，地层中的水将沿着裂缝和采空塌陷区大量进入巷道内，造成严重的透水事故，使掘进工作无法顺利进行，严重时将导致井巷的报废，甚至造成重大的人身伤亡事故。针对传统水泥浆经水侵后不凝固或被流动水稀释而完全漏失，起不到应有的封堵固化作用等问题，研制出一种防水侵水泥浆封堵材料。该水泥浆与水按1∶1的比例掺混后仍具有凝结时间快、凝结强度高等特点，可在25 ℃以上的温度条件下使用。在某煤矿840 m井深、120 m3/h出水量情况下进行堵水作业试验，堵水效果良好，可在类似的条件下推广应用。

Abstract:

Underground tunnel excavation is still the main way of coal mining, some fracture stratum zones, non cemented soft strata and aquifer on coal seam roof must be encountered in the mining process. If there is misconduct in the excavation, a large amount of formation water may enter along the cracks and through mined-out subsidence areas into the tunnel to cause severe flooding accident, the excavation work will be severely affected, the well lane might be abandoned and even serious personal injury accident might happen. According to the disadvantages of traditional cement slurry, a kind of waterproof has been developed, which is mixed with water at ratio of 1∶1 with rapid condensation and high condensation strength and can be used at the temperature over 25℃. This cement slurry is tested in a mine water plugging operation, the well is 840m in height with outflow of 120m3/h, good water plugging effect is received.