老挝万象平原龙怀钾镁盐矿水文地质及工程地质特征

Hydrogeologic and Engineering Geologic Characteristics of Longhuai Potassium-Magnesium Salt Mine on Vientiane Plain in Laos

万象平原龙怀钾镁盐矿地处呵叻盆地北部边缘,老挝西南部万象平原低地。区内总体地势北高南低,自东向西倾斜,其内多发育低山丘陵,区内水系较发育,湄公河为规模较大的地表水。区内矿产以钾盐矿为主,钾镁盐矿主要赋存于塔贡组下段膏盐岩亚段(E_1tg~(1-1))中。通过对龙怀钾镁盐矿区水文地质、工程地质特征的分析,结合矿区地质背景和抽水试验资料,划分了矿床水文地质条件类型和工程地质条件类型,并对未来矿坑突水量进行估算,对矿山工程地质进行评价,提出了矿床开采可能产生的矿山地质环境问题,为进一步工作及今后安全采矿提供了依据。

Longhuai Potassium-Magnesium Salt Mine on Vientiane Plain is located on the northern edge of Korat Basin and the lowland of Vientiane Plain in the southwest of Laos.The overall topogra-phy of the area is high in the north and low in the south,tilting from east to west,with low hills de-veloping in the area,and the Mekong River is a large-scale surface water in the area.The minerals in the area are mainly potassium and magnesium salts,and the potassium and magnesium salts are mainly deposited in the lower section of the Tagong Formation(E1tg1-1),which is a sub-section of anhydrite.Through the analysis of hydrogeological and engineering geological features of Longhuai potassium-magnesium salt mine,combined with the geological background of the mine and pumping test data,the study classifies the types of hydrogeological conditions of the deposit and the types of engineering geological conditions,estimates the amount of sudden water in the future pits,evaluates the engineering geology of the mine,then puts forward the mining geological environmental problems that may arise from the mining of the deposit,which provides a basis for further work and safe min-ing in the future.