. Altered rock has tow kinds of failure: tensile-shear and shear-tensil failure under high pressure seepage. seepge pressure act on the failure as:①it help to form small fractures in rock surface,②it reduce friction on the failure surface.
高压渗流下蚀变岩可分为张剪和剪张破坏型两种。
参考来源 - 小湾水电站坝肩蚀变岩高压渗流条件下的力学特性及工程响应研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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。
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。
Especially in high dam project with high seepage and pore water pressure, the degradation of material properties of concrete affects more evidently.
特别是在高渗透孔隙水压力作用下，混凝土材料性能劣化现象明显，严重影响了工程的安全性能。
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