To investigate the effect of fracture surface roughness on solute transport in a rough fracture and the effect on the hydrodynamic dispersion coefficient DL and transport velocity Vt,roughness and hydraulic aperture of various fractures under constant head were calculated using fractal theory.The study discussed the influence of roughness on solute transport in rough fractures,as well as the seepage flow and solute velocity with different fractal dimensions.Breakthrough curves were generated by integrating the Navier-Stokes equation and the advection-diffusion equation(ADE).The breakthrough curves from direct simulation were coupled using the classical ADE approach.Subsequently,DL and Vt were determined.The study explored the control exerted by DL and Vt on solutes and their correlation with roughness.A prediction model based on fractal theory for solute transport in rough fractures was established and compared with direct simulation and geometric feature-based models.Results indicate that fractal dimension D and amplitude parameter Kv effectively characterize surface roughness,with a strong correlation between DL,Vt,and fractal parameter DKv.The established model demonstrates high applicability and accuracy in simulating solute transport in rough fractures.
关键词
岩石力学/粗糙岩体单裂隙/溶质运移/裂隙粗糙度/分形理论
Key words
rock mechanics/rough single fracture/solute transport/fracture roughness/fractal theory
维普
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