摘要
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,并阐述了这两个特征参数的物理意义和工程意义。
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 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 with 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.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2002年第10期1442-1446,共5页
Chinese Journal of Rock Mechanics and Engineering
