(一)情况介绍压水试验是探求裂隙岩层渗透性的重要方法之一。依分段的方法来看,压水试验可分:一、钻一段,压一段(如图1)。二、一次钻到底,从下至上逐段压水(如图2)。但是这两种压水方法在实际操作中均有一定的缺陷。如采用第一种方法,在做压水试验时,钻机必须暂时停止工作,在一旁 (I) Situation Introduction Press water test is one of the important methods to explore the permeability of fractured rock layers. According to the method of segmentation, the water pressure test can be divided into: First, drill a section, press a section (Figure 1). Second, a drill in the end, press water from the bottom to the top (Figure 2). However, these two methods of water pressure have some defects in practical operation. If the first method is used, the rig must be temporarily stopped when doing the pressure test.