不同水流速度下温度对奥陶系碳酸盐岩溶蚀速度的影响

Influence of temperature on dissolution rate in Ordovician carbonate rock in different water flow rate

为了解不同水流速度下温度对碳酸盐岩溶蚀速度的影响,以自行设计、制造的能够模拟水流条件,并且可同时容纳24个样品的溶蚀试验装置为平台,以淮南张集矿、潞安漳村矿和兖州东滩矿奥陶系灰岩为代表性岩石试样,选取不同温度、水流速度及CO2压力,进行了溶蚀试验。试验结果显示,在水流速度较低时(16.67 mL/min),环境温度的变化对溶蚀速度的影响比较微小(平均溶蚀变化量为0.000 6 g/cm2)。在水流速度较大时(60 mL/min),温度的改变对溶蚀速度影响较大(平均溶蚀变化量为0.0038 g/cm2)。也就是说在地下水的强径流带,温度对溶蚀速度的影响相对较大,溶蚀速度较快,所以岩溶较发育。

In order to understand the influence of temperature on dissolution rate in Ordovician carbonate brock in different water flow rate, dissolution experiment was conducted at different temperature, different water flow rate and different CO2 pressure with self-designed and manufactured dissolution device which can simulates water flow conditions and contains 24 samples as platform, samples collected from Zhangji mine in Huainan, Zhangcun mine in Luan and Dongtan mine in Yanzhou were used as representative samples. The experiment results show that when water flow rate is relatively low（16.67 mL/min）, the influence of environmental temperature change on dissolution rate is insignificant（the average dissolution volume is 0.0006g/cm2）, when the water flow rate is high （60mL/min）, the influence of temperature change on dissolution rate is significant （the average dissolution volume is 0.0038g/em2）. That is to say, in strong run-off zone of ground water, the influence of temperature on dissolution rate is bigger and the dissolution rate is higher, so karst is developed.