变容压力脉冲渗透系数测量方法研究

 从理论上讨论传统压力脉冲法(定容脉冲法)在渗透系数测量量程上的局限性，提出水箱容水量可调的变容压力脉冲法(变容脉冲法)的新思路。介绍变容脉冲法的原理、装置及试验流程。与定容脉冲法不同，变容脉冲法试验装置的水箱内装的流体为气液两种流体的综合体，可以通过调节气液体积比来实现容水量的改变。通过调节水箱内不同的气液体积比(不同容水量)条件下对同一个岩石试件进行渗透系数重复测量，分析变容脉冲法的重复性。试验结果显示，该方法具有很好的重复性(小于5%)，并与恒流法测得的渗透系数相近。

RESEARCH ON MEASURING METHOD OF PERMEABILITY BY USING STORAGE-VARIABLE TRANSIENT PULSE METHOD

Transient pulse method is a theoretically well-established and widely used method at home and abroad. The limitation of the method in measuring range due to its fixed apparatus storage is discussed theoretically. Storage-variable transient pulse method for permeability has been proposed. The principle，test device and procedures of the storage-variable transient pulse method have been introduced；and the repeatability is analyzed based on the repeated permeability measurements at different apparatus storages. The results show that the measured values have a good repeatability(less than 5%) and well agree with that measured by constant flow method.