Comprehensive Exploration and three-dimensional construction technology of water plug based on directional horizontal drilling caved column

The ordovician limestone water inrush accident occurred during the excavation of 8228 working face in Tashan Coal Mine, Tongmei Group. On basis comprehensive geophysical exploration above and below well, order to find out development boundary flowing subsided column distribution characteristics broken body filled it, control by Grouting, boundary, influence zone, cementation fractured are found means multi-layer multi-branch surface directional horizontal drilling speed logging, fluid leakage, cuttings logging while drilling, combined with data statistical analysis. length short axis collapse is 410m - 200m, area mainly distributed right front driving head belt roadway near roadway. 3d geological modeling spatial structure carried using SURPAC software, main passageway area, fracture secondary divided according crushing degree filling material. In view different zones body, technology three-dimensional block grouting used construct separate technology. safe mining finally realized treatment cutting source reinforcing water-flowing column. provides a good reference for other similar projects.