Effect of Contact Areas on Seepage Behavior in Rough Fractures under Normal Stress

The investigation of fluid flow in fractured rocks is a key issue underground engineering. Three sandstone specimens with different roughnesses were generated by Brazilian splitting, and the geometric morphology aperture distribution obtained three-dimensional scanning technology. Fractal dimension was introduced to characterize roughness fractures. Seepage experiments rough fractures conducted analyze influence fractal contact ratio on nonlinear behavior subjected normal stresses, which proves that Forchheimer equation can better describe nonlinearity. A modified Bandis model proposed calculate max compression displacement fracture under stress. Subsequently, new developed forecast coefficient based ratio. Moreover, semiempirical established critical Reynolds number. areas seepage path simulated COMSOL.