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Second, fill the channel
Third, rectify the river
Fourth, build a drainage (cut) ditch
Surface water treatment measures
First, reasonable determination of wellhead location
The wellhead elevation must be higher than the highest flood level in the local history, or build a solid high platform, or build a reliable drainage ditch and flood control dam near the wellhead to prevent surface water from being poured into the well through the wellbore.
In order to prevent rain and snow from seeping people downhole, measures such as filling pits, filling concaves, leveling the surface or building an impermeable layer are adopted in the mining area.
(1) Finishing the riverbed
A certain section of the river passes through the mining area, and the riverbed is highly permeable, which can cause a large amount of river water to infiltrate the underground. In the lost area, clay, stone or cement is used to build an impervious artificial riverbed to stop or reduce the river water infiltration.
(2) River diversion
For example, near the river flowing people's mining area, you can choose a suitable location to build a dam, cut off the original river channel, and use artificial river channels to bring the river water out of the mining area.
After precipitation in the mountainous area, it will flow into the mining area in the form of surface water or diving. When there is a collapse crack on the surface, the amount of water in the mining area will be greatly increased. In this case, a drainage ditch can be built in the direction of the water flow above the outer edge of the well or the water leakage zone to drain the water out of the affected area.