蚀变岩水—岩相互作用试验研究

Experimental Study on the Alter-Rocks and Water Interaction

对疏松易碎的蚀变软弱岩块进行了水—岩化学作用的试验研究。为缩短浸泡时间,加速水—岩相互作用,采用一种极端的方法,把岩块敲碎经筛分取小于10 mm粒径岩屑,利用电磁式空气泵从岩屑底部连续吹气的方式进行浸泡试验(其中一组考虑了酸碱度的变化),期间按不同时段取水样分析。试验结果发现:浸泡溶液的离子浓度变化不大。在常压条件下,水—岩化学作用对蚀变岩体的渗透性及力学性质影响均较小。但在酸性条件下会加剧水—岩化学反应。

In order to shorten the soaking time and accelerate water and rock interaction,an especial method is used for the loose and frangible soft alter-rocks. This method is that,breaking the rock mass into pieces and the diameter less than 10 mm rock debris have been selected to soak in water for a long time. In the same time, the electromagnetism air pump was introduced to continually blowing air under the rock debris, and the water samples have been taken to do chemical analysis in different period. The test results conclude that the ions concentration of the testing solution changed a little. Therefore, at atmospheric pressure, the permeability and mechanics characteristics have been little affected by water and rock interaction except under acidic conditions.