Abstract:Fresh water infiltration has always been a difficult problem for potash mining. By analyzing the characteristics of waterbearing and waterretaining layers and hydraulic relations between the layers in Dongtai potash mining area in Laos, it is concluded that main water source of the mine is Quaternary fresh water and upper mudstone fissure water, and the waterfilling channel is mudstone fissure water. In this paper, water prevention and control measures are put forward as follows: water should be explored in advance before mining in order to master hydrological characteristics. Curtain pre grouting is used to block water around the shaft and roadway works to block the water filling channel. Intercepting ditch should be excavated to cut off fresh water in the upper part. The cement closed loop is formed by grouting behind the shaft wall to seal the water and close the outlet point. A perfect drainage system should be set up to drain water out of the mine. Thus, the safety of mine production can be ensured.
