山西王家岭矿区奥陶系碳酸盐岩溶蚀规律研究

Experimental Simulation of Ordovician Carbonate Rock Dissolution Pattern in Wangjialing Mine Area, Shanxi Province

为研究王家岭矿区奥陶系碳酸盐岩的溶蚀规律,模拟造成差异性溶蚀的主要因素进行了实验。在常温常压、溶蚀液碳酸水的pH值为6.5～6.9、每次溶蚀时间控制在24h左右的条件下,对矿区不同层段的碳酸盐岩进行溶蚀实验。实验发现,碳酸盐岩的成分和结构是影响溶蚀指标的重要因素,比溶蚀度和比溶解度总体趋势是白云岩<灰岩<膏岩;不溶物含量的增大使比溶蚀度和比溶解度下降,机械破坏量呈非线性增加;相同情况下方解石溶解速度快于白云石2～3倍。该实验结果为矿区进行水文地质研究提供了基础数据。

For to make acquaintance with dissolution pattern of Ordovician carbonate rocks in the Wangjialing mine area, carried out experimental differential dissolution main factors simulation. Carbonate rock of different sector dissolution experiments were carried out under the conditions of normal temperature and pressure, pH value of denuding carbonic acid solution 6.5-6.9, and about 24h of each dissolution time controlled. Through the experiments have found that composition and structure of carbonate rocks are the major factors to affect dissolution indices, overall trend of specific corrosion and specific solubility is dolomite 〈 limestone 〈 gypsum; the increasing of insolubles makes specific corrosion and specific solubility decreased, mechanical disruption increased nonlinearly; under the same condition, dissolution rate of calcite is quicker than dolomite 2-3 times. All the results have provided with basic data for the study of hydrogeological conditions in the mine area.