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在竖井开凿过程中,有时需要穿过松软不稳定的含水冲积层、涌水量很大的裂隙洞孔岩层、地质和水文地质条件很复杂和恶劣的地层等。在这种情况下,若采用井巷普通施工方法,会遇到很大困难,而工作面预注、浆堵水法则是一种行之有效的特殊施工法。焦作矿区自1955年以来,曾先后在中马村、朱村等矿的竖井施工过程中多次使用预注浆堵水施工方法,均收到了良好的堵水效果。现将工作面预注浆止水垫的选择和应用,作一介绍供参考。竖井工作面预注浆就是当井筒掘进距含水层还有一段距离时停止掘进,直接利用上部不透水岩层或修筑人工止水垫进行钻孔注浆。岩帽止水垫是在含水层上部留一段不透
In the process of shaft drilling, sometimes it needs to go through soft and unstable aquifer alluvium, fissure hole with large water gushing, complicated geological and hydrogeological conditions, and bad strata. Under such circumstances, it will be very difficult to adopt common construction methods for well boreways. However, pre-injection of working face and plugging of water are an effective and special construction method. Since 1955, Jiaozuo Mining Area has successively used pre-grouting and water-blocking construction methods in the shaft construction of Zhongma Village and Zhucun Mine and received good water-blocking effect. Now the face of pre-grouting water mats choice and application for an introduction for reference. The pre-grouting in the shaft face is to stop the excavation when the wellbore excavation is still some distance away from the aquifer and directly use the upper impervious rock formation or the artificial water-sealing pad for drilling grouting. Rock caps water mats in the aquifer upper part of impervious