The Technology of Water Detection and Drainage through upward Boreholes in Roof Gob

In order to mine coal seam 10 # safely in Carboniferous Taiyuan formation, Pangpangta colliery of Huozhou Coal and Electricity Co. Ltd carried out water drainage from the gob of old mine above face 10-702 of seam 10 # and made analysis about the distribution conditions and water-accumulating characteristics in the gob, and through the rational arrangement of water detection and drainage boreholes, upward boreholes were drilled to drain safely accumulated water in the gob of seam 5 # and water in Taiyuan limestone. Totally 475 800 m3 water were drained, providing technical guarantee for safe mining of face 10-702, and the good result was achieved. The success of the project provided the Huozhou Coal and Electricity Co. Ltd with precious experience for the future transformation of old mines, water detection and drainage of gob during reformation and integration of small mines.