High seepage pressure lead to damage zone growth in unfavorable fault zone and even transfixion may be the important reasons which result in bank slope instability.
高渗透压诱发岸坡不利断层带损伤区扩展，甚至贯通可能是导致岸坡失稳的重要原因。
Therefore, it is put forward herein that high seepage pressure exists locally in the rocks when under jet action, and the magnitude of seepage pressure greatly affects the rock cutting results.
为此，提出了射流作用下岩石局部范围具有较高渗流压力的思路，并认为该渗流压力大小对射流的破岩作用有重大影响。
Experiments show that a low permeable reservoir has a starting pressure gradient, and therefore different seepage rule from that of middle and high permeable reservoirs.
实验表明，低渗透油藏具有启动压力梯度，因此其渗流规律与中、高渗透油藏不同。
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