Two-step grouting modification water-retention coal mining method for roof …

CN110242301B · office CN · priority 2019-03-25 · published 2020-05-05

The invention discloses a two-step grouting modified water-retaining coal mining method for a roof aquifer, comprising a coal seam and an aquifer located above the coal seam. The specific implementation steps are: acquiring parameters; obtaining a first space range through calculation; The first …

Inventor: 范钢伟 · Assignee: 中国矿业大学

Open the patent document · source query “flood barrier”