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岩体的渗透稳定性关系到地下洞室围岩体的稳定性。以一抽水蓄能电站设计阶段进行的高压渗透试验为例,重点探讨了试验过程中流量Q与压力P之间的关系,岩体的渗流性态以及岩体的允许水力坡降等重要方面。根据不同的P~Q关系曲线,得到呈相对闭合的裂隙明显存在临界水头压力,而具有一定开度的裂隙则不然;随着水头压力的增大,岩体的渗流性态渐趋敏感;而在较高水头压力的持续作用下,岩体的允许水力坡降值则有减小之势。因而认为,进行高压渗透试验,可以更为真实地反映深埋地下洞室围岩体的渗流状态。
The seepage stability of rock mass is related to the stability of the surrounding rock mass of underground caverns. Taking the high pressure penetration test at the design stage of a pumped storage power station as an example, the important aspects of the relationship between the flow rate Q and the pressure P, the seepage behavior of the rock mass and the allowable hydraulic gradient of the rock mass are discussed emphatically. According to different P ~ Q relation curves, the critical head pressure is obviously existed in the relatively closed fracture, while the fracture with a certain opening degree is not. With the increase of head pressure, the permeability of rock mass becomes more and more sensitive. Under the continuous action of higher head pressure, the allowable hydraulic gradient of rock mass decreases. Therefore, it is considered that carrying out the high-pressure penetration test can more truly reflect the seepage state of the surrounding rock mass in the deep underground caverns.