三维应力下岩石节理面的渗流特性

Seepage characteristics of rock joint under three-dimensional stresses

基于渗流场与应力场的耦合关系,从侧向应力引起的侧向变形入手,经过合理的理论推导,给出能够反映节理面在三维应力作用下渗流特性的等效水力张开度-应力公式;根据室内物理试验数据拟合理论公式得到水力张开度的表征经验公式,给出理论公式应用于实际工程的方法,并利用数值试验佐证该公式的合理性;采用3DEC程序进行三维应力作用下节理面渗流数值试验,为利用3DEC进行类似研究提供有益借鉴。

The coupling effect of seepage field with stress field and the lateral deformations caused by lateral stresses were considered. The formula of equivalent hydraulic aperture to stress was discussed theoretically which can reflect the seepage characteristics under three-dimensional stresses. The empirical formula characterizing hydraulic aperture was fitted on the basis of physical test data, and it was proved reasonable through the numerical experiments. At the same time, the method using the theoretical formula in real engineering was given. The 3DEC program was adopted for numerical experiments to investigate the seepage characteristics of joint under three-dimensional, which can provide useful reference for similar research.