霄雲煤矿井下突水定向井钻孔堵水施工技术及注浆方法

根据霄雲煤矿1313工作面突水情况，以及该突水点周围地层和构造，针对该突水点采用定向钻孔施工技术进行堵水施工，同时施工4个定向钻孔，其中施工2个突水通道注浆孔XY1、XY2封堵通道，定向封堵通道孔找准涌水通道是钻孔施工的关键；2个盖帽钻孔XY3、XY4，定向盖帽孔对准突水点封堵并提高注浆水头压力是钻孔施工的关键；钻孔钻穿突水点附近上方的采空区顶板，通过向突水点附近的采空区注入石子、沙子、水泥等封堵出水点，起到封盖出水点的作用。采用下行方式注浆，逢漏（漏失量大于10m3/h）注浆封堵。根据钻探揭示的实际地质及水文地质条件，对钻孔的裸孔段，采取下行、大小间歇、复扫、复注的方式，达到注浆终止条件为止，凝固24h后，继续钻进，遇漏重复注浆，直至设计终孔深度为止。

Construction Technology of Water Plugging in Directional Well of Underground Water Inrush in Xiaoyun Coal Mine

According to the water inrush situation at 1313 working surface of Xiaoyun coal mine, the strata and structure around the water inrush point, aiming at water inrush point, directional construction technology is used for water-proof construction, and 4 directional drilling holes have been constructed at the same time. Grouting holes XY-1 and XY-2 have been blocked the channel. Directional blocking the channel hole and identifying the water inrush channel is the key of drilling construction. Two cap holes XY-3 and XY-4 are aligned with the water inrush point to block and improve the grouting head pressure is the key to the drilling construction. The borehole is drilled through the roof of the goaf above the water inrush point, and the water outlet point is blocked by injecting stones, sand and cement into the goaf near the water inrush point. The grouting leakage is greater than 10m3/h. According to actual geological and hydrogeological conditions revealed by drilling, for the open hole section of the drilling, the methods of descending, large and small intervals, re sweeping and are grouting shall be adopted until the grouting termination conditions are met. After 24 hours of solidification, the drilling shall be continued, and the grouting shall be repeated in case of leakage until the design final hole depth is. The project lasted two months and successfully completed the drilling and grouting water plugging work.