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(1) The water inrush in the mine is consistent with the local precipitation dynamics, with obvious seasonal and multi-year periodic changes.
(2) Most deposits increase the amount of water inflow from the mine with the deepening of the mining depth, and the peak of the high water lag is delayed.
(3) The amount of water influx in the mine is also closely related to the nature, intensity, continuous time and conditions of precipitation.
2. Characteristics of water inrush with surface water as the main water-filling source
The law of water inrush in surface water-filled deposits is:
(1) The water inflow dynamics of the mine varies seasonally with the abundance of surface water, and its water inrush intensity is related to the type, nature and scale of surface water. The water influx of the deposits recharged by rivers with large seasonal flow changes also has a seasonal cyclical change.
(2) The water inrush intensity of the mine is also related to the distance between the well and the surface water body, lithology and structural conditions. Under normal circumstances, the smaller the spacing, the greater the water inrush strength; the stronger the permeability of the rock layer, the greater the water inrush strength.
(3) The impact of mining methods. According to the hydrogeological conditions of the deposit, the correct mining method is used to extract the deposits of the near-surface water body, although the water inrush intensity will increase, but it will not affect the production too much.
3. Deposits with groundwater as the main water-filling source
(1) The intensity of water inrush in mines is related to the porosity of the water-filled layer and the degree of water enrichment.
(2) The intensity of water inrush in mines is related to the thickness and distribution area of ​​the water-filled layer.
(3) The intensity of water inrush in mines and its changes are also related to the composition of water in the aquifer.
4. Mineral deposits with water in the old goaf as the main water source
In the shallow parts of many old mining areas in China, old goafs (including flooded wells) are dotted with large amounts of water. Most of them have unclear water accumulation, complicated connection, large water volume, strong acidity and high water pressure.
1. The characteristics of water inrush from the main water-filled water source