Investigation of Nonlinear Flow in Discrete Fracture Networks Using an Improved Hydro-Mechanical Coupling Model

Fractures commonly exist in rock masses; the coalescence of fractures provides fluid flow pathways a fractured mass and greatly increases capacity rock. This work aims to study characteristics nonlinear fractures. A series tests were conducted indicated that Forchheimer law performed well when describing relationship between hydraulic gradient flow. The test results also indicate higher water pressure may induce stronger nonlinearity. Additionally, linear coefficients increase with decrease particle size filling material On basis laboratory results, classical was modified by considering influence stress on variation fracture aperture. hydro-mechanical coupling model for masses built programmed subroutine through ABAQUS. Furthermore, random discrete network generated simulated prove high velocity will result flow, not only single fracture, but network. numerical from show ratio hydraulc change weak nonlinearity and, finally, strong an gradient. It shows confining they Due complexity channels, is likely occur mass. Finally, developed applied simulate behavior underground engineering; smaller aperture is, required be order regime nonlinear.