Numerical Analysis of Fluid Flow Through Rock Joints

• Main Authors: Huang, Gan-Zhong, 黃幹鐘
• Other Authors: Sheng, Ruo-Pan
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/94305479504558463359

碩士 === 國立中央大學 === 土木工程研究所 === 83 === Fluid flow through rock joints is commonly described by the parallel plate model. However deviations from this model are expected because real joint surfaces are rough and contact each other at discrete points. In order to consider the surface roughness effect on fluid flowing through joints, pairs of rough surfaces generated by fractal model of surface topography are placed together at various mechanical apertures to form a series of "joints" and a finite element computer program is used to calculate the seepage through such joints. The fractal technique produces rough surfaces with homogeneous and isotropic roughness. However the seepage through such joints with small mechanical aperture presents a strong anisotropic behavior. Simulations show that the areas of contact surfaces and the size of finite elememt mesh of a rock joint are not the reasons causing the anisotropy of seepage. Rather, it is caused by the apertures variation of joints. When a joint with small mechanical aperture, the variation of aperture distribution is very large, so is the variation of seepage along different floe directions. As the mechanical aperture increases the effect of aperture variation decreases and the flow behavior becomes isotropic.