Mine water damage drainage recovery and recovery work
( 1 ) Work in drainage recovery
1. Before recovering the flooded roadway, an investigation report on the water inrush project should be prepared. The report should include the following main elements :
(1) The process of water inrush, the location of water inrush, the time of water inrush, the form of water inrush, the analysis of water source, the speed of flooding and the change of water inflow.
(2) The extent of water inrush and the estimated amount of water.
(3) The amount of water in the drainage is expected. Find out the amount of water inflow in all parts of the well before flooding, calculate the maximum water inflow and stable water inrush at the water inrush point, estimate the amount of water inflow at different elevations, and design the displacement curve during the recovery process.
For hydrogeological points (holes, wells, springs) of the curve and the dynamic data (4) analysis of water provided with projections reasons, hydrogeological plan sectional view and FIG aqueous mine water chemistry charging information.
2. When the mine is restored, special personnel should be set to regularly measure the amount of water inflow and the elevation of the water surface, and make a record ; observe the record of the roof, the piece and the water in the well after recovery ; observe and record the specific location of the water inrush point , water inflow and water temperature, etc., and make sketches of water inrush points ; regularly observe the hydrogeological points such as ground observation holes, wells, springs, etc., and observe the ground collapse and crack phenomenon.
3. Before removing the water from the wellbore and the downhill mountain and recovering the flooded roadway, safety measures should be taken to prevent the sudden emergence of harmful gas sealed by water. During the drainage process, the mine rescue team should check the air composition on the water surface ; find harmful gases and dispose of them in time.
( 2 ) Work after recovery
  After the mine is restored, the drawings and data of the two processes of flooding and recovery should be comprehensively compiled to determine the cause of water inrush, propose measures to avoid repeated accidents, and summarize the experience and lessons of hydrogeological work in drainage restoration.
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