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为了研究粘土岩的气体渗透率特性,利用瞬间脉冲法测量原理,研究开发出低渗透率气体测量的三轴设备.并详细地介绍分析各种影响气体测量中的关键技术参数(气体压力、压力增量、温度和气体容器大小),结合反分析法准确地确定岩石的渗透率.借助该设备,粘土岩在不同应力水平条件的气体渗透率被跟踪测量.实验结果表明该设备可以准确测量低渗透岩石(<10-21m2),该地质材料的气体渗透率随偏应力增加而减少,但即使材料已经处于损伤阶段,这种变化也非常微弱,因此气体渗透率的变化不能作为一个有效的损伤变量.
In order to study the gas permeability characteristics of clay rock, the principle of instantaneous pulse measurement is used to study and develop the triaxial equipment with low permeability gas measurement. The key technical parameters (gas pressure, pressure Incremental, temperature and gas container size), combined with reverse analysis to accurately determine the permeability of the rock with which the gas permeability of clay rock at different stress levels is tracked measurements.The experimental results show that the device can accurately measure the low Infiltration of rocks (<10-21 m2) decreases the gas permeability of the geological material with increasing partial pressure, but the change is very weak even if the material is already in the damage phase. Therefore, the change of gas permeability can not be used as an effective damage variable.