FUNDAMENTAL STUDY ON FLOW RESISTANCE IN ROCK FISSURES

Abstract

With respect to hydraulic analysis of the groundwater movement in fractured rocks, the determination of permeability and the establishment of resistance law is one of the most important tasks. In particular, it is needed to clarify the flow characters of an elementary fissure in a number of interconnected fractures on the basis of dynamic analysis of viscous fluid. This paper presents the flow analysis and resistance law for the elementary fissure having irregular and rough wall in the interstitial channel. Typical flows of viscous fluid through single fissure models were analyzed by the finite difference method of Navier-Stokes and vorticity equations. In addition, an experimental spectrum analysis of fracture samples obtained from granite rocks was carried out in the laboratory. Then, a permeability formula was proposed for the single fracture.