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为研究岩石不同渗透特性,对石灰岩和闪长岩进行了瞬态渗透实验,研究了岩样全应力-应变过程中的渗透率演化规律以及孔隙压差与时间的关系,并建立了岩样变形破坏过程的应变-渗透率方程,最后分析了这两种不同类型岩石渗透机理.实验结果表明,闪长岩的渗透率在峰前很低且基本不变,在峰值强度时产生“突跳”现象,石灰岩的渗透率在岩石强度峰值前后随岩石变形逐渐增大.应变-渗透率曲线的拟合方程更能深刻描述岩石破裂过程的渗透规律,孔隙压差与时间的变化关系呈一元四次多项式的关系.岩石渗透性与岩石的应力状态和岩石内部结构及力学性质有关.
In order to study the different infiltration characteristics of rock, the transient infiltration experiments of limestone and diorite were carried out. The evolution law of permeability and the relationship between pore pressure difference and time in the process of total stress-strain were studied, and the deformation of rock specimen The strain-permeability equation of the failure process, and finally the infiltration mechanism of these two different types of rocks are analyzed.The experimental results show that the permeability of the diorite is very low and basically unchanged before the peak, resulting in a sudden jump at the peak intensity ", The permeability of limestone gradually increases with the deformation of rock before and after the peak of rock strength.The fit equation of strain-permeability curve can describe the infiltration law of rock rupture process more profoundly, and the relationship between pore pressure difference and time is one yuan Fourth-order polynomial relationship between rock permeability and the rock’s stress state and the rock’s internal structure and mechanical properties.