岩石在伺服条件下的渗透性与应变、应力的关联性特征

根据伺服渗透试验所获得的渗透率－应变关系与应力－应变关系，分析了全应力－应变过程中岩石渗透性随变形的变化特点及软、硬岩渗透率－应变关系的主要差异和渗透率－应力之间的关联性，对破坏前的岩石渗透率－应力关系所作的耦合结果表明：对于峰值应力前的变形段，不同岩性的渗透率－应力关系曲线表现有相近的几何特征，且二者的对应性和分段规律十分明显。基于这种特点，提出了临界抗渗强度和起始渗透率两个特征值，建立了峰值应力前岩石渗透性－应力关系数学表达式，并阐述了这两处特征参数的物理意义和工程意义。

CORRELATIVITY AMONG ROCK PERMEABILITY AND STRAIN,STRESS UNDER SERVO-CONTROL CONDITION

The relationship among permeability,strain and stress of rock is discussed for both brittle and plastic fracture based on the permeability-strain curve and permeability-stress curve obtained from the permeability test under complete stress-strain path. The results of coupling behavior of permeability of rock with stress before peak pressure show that permeability-stress curves of various rock samples resemble each other in geometrical pattern,and correlativity between permeability and stress is obvious. A formula is proposed to show the behavior of permeability expressed with increasing of stress. In addition,a characteristic parameter of stress is proposed to indicate critical anti-permeability strength of rock which corresponds to the stress causing permeability strengthening distinctly. And an example of application of the characteristic parameter is also given to evaluate water-insulating capability.