SUMMARY

Prevention of groundwater burst through the quarry bottom during clay exploitation
in Trúc Thôn mine, Hải Dương Province

Đặng Hữu Ơn, Trương Quảng Đại

Groundwater burst through the quarry bottom is one of hydrogeological problems attracting many experts when designing exploitation of clay quarry in Kiến Lương mine, An Giang Province and Trúc Thôn mine, Hải Dương Province. To select a reasonable method, it is necessary to combine in solution between the prevention and resistance against groundwater burst through the quarry bottom.

From calculated results in the Trúc Thôn mine, the authors come to following conclusions:

1. To avoid the phenomenon of groundwater burst through the quarry bottom from Neogene interstitial aquifer in Trúc Thôn mine, it is necessary to leave a protective pillar of 7.5 m in average thickness;

2. Without protective pillars, when the quarry area is 40.000 m² it should have to drain 338.548 m³/day of water, equivalent to 1 m² it should have to drain 8,5 m³/day of water.

3. The exploitation by small quarries, and filling up the quarry after exploiting is the best solution when exploiting clays in Trúc Thôn mine, Hải Dương Province.