矿井后期开采底板低阻异常区治理探索与应用

Brief Discussion and Application of Floor Low Resistance Abnormal Area in Late Mining of Mine Shaft

米村矿26采区煤柱工作面回采范围内裂隙发育,隔水层厚度不均,主要含水层不稳定且水量大,地质及水文地质条件较复杂。为确保采区煤柱带压开采有足够的有效隔水层厚度,经过系统分析、充分论证,改变以往对L_(7-8)及L_6灰岩作为注浆改造目标层的做法,采取不接触L_(1-4)灰岩含水层而直接把L_(1-4)灰岩含水层上部的L_5灰岩作为注浆改造目标层,有效治理了底板水害,确保了矿井的安全回采。

The fissures are developed in coal winning area on coal pillar working face in 26 mining area of Micun Mine,and the thickness of impermeable layer is uneven,the main aquifer is unstable and the volume of water inrush is large,geological and hydrogeological conditions are more complex. To ensure adequate and effective exploitation of impermeable layer thickness when mining under safe water pressure of aquifer,through systematic analysis and full argument,the past method,which makes L7-8 and L6 limestone layer as the target layers,was changed into the new one. The new method is in non-contact with L1-4 Gray rock aquifer,and L5,which is upper L1-4 limestone aquifer,is taken as the target layer of grouting transformation. The application of the method has effectively controlled the floor water damage,and has ensured the safety of mining.