奥灰岩溶水上带压开采区域超前治理防治水技术

Technology of regional advance water prevention and control applied to pressurized coal mining above Ordovician limestone karst water

针对邯邢矿区煤层开采受奥灰承压水威胁现状及保水开采的现状,提出了区域超前治理防治水技术,以超前主动、区域治理、全面改造、带压开采的指导原则,该技术在邯邢奥灰含水层顶部区域超前注浆改造中进行应用,以孔口终压1.0 MPa、稳定30 min以上和单孔吸浆量小于50 L/min作为注浆结束标准。试验过程中采用地面多分支水平钻进关键技术,最终达到注浆和加固煤层地板含水层及奥灰顶部改造含水层目的,大幅降低煤层底板突水可能性,安全开采出受承压水威胁的煤炭资源。

According to the situation of coal seam mining threatened by pressurized Ordovician limestone karst water and the status of water keeping mining in Han-Xing Mining Area,a regional advance water prevention and control technology was provided with the advance and initiative,regional control,full reconstruction and pressurized mining as the guidance principle. The technology was applied to the reconstruction of regional advance grouting at the top layer of an Ordovician limestone water aquifer in Han-Xing Mining Area. The final pressure at the borehole top was1. 0 MPa and would be kept over 30 min,and a grout adsorption of borehole was less than 50 L / min. The above conditions would be the standard to terminate the grouting operation. In the experiment process,the key technologies of surface multi branch horizontal drilling were applied. Finally,the targets to reinforce the aquifer in the floor of seam and to reconstruct the aquifer at the top of the Ordovician limestone were realized. The possibility of water inrush from the seam floor would be highly reduced and the coal resources threatened by the pressured water could be mined safely.