考虑峰后力学特性的岩石节理渗流广义立方定理

A generalized cubic law for seepage flow through rock joints considering post-peak mechanical response

通过建立考虑峰后剪胀及剪切软化效应的岩石节理法向变形模型,基于渗流扩散能等效原理,提出了一个岩石节理渗流广义立方定理,较为合理地描述了节理在较大法向闭合变形条件下的渐进渗流特性以及节理出现剪胀及剪切软化条件下的峰后渗流特性。采用已有压剪渗流耦合试验对广义立方定理进行了验证,表明采用常系数修正的立方定理能较好表征节理的峰后渗透特性。

By establishing a normal deformation model for rock joims subjected to normal and shear loading with consideration of post-peak dilatancy and shear softening, a generalized cubic law is proposed on the basis of the equivalence principle of seepage flow dissipation energy for better describing the irreducible seepage flow behavior for the joints subjected to large normal closure and the post-peak seepage flow behavior at the presence of dilatancy and shear softening. The proposed theory has been validated by an existing coupled shear-flow test, showing that the seepage flow behavioral trend of rock joints in post-peak stage can be enough accurately predicted by the traditional cubic law penalized with a small constant.