The Study On Numerical Analysis Of Damage-Failure Mechanism In Jointed Rock Masses Affected By Seepage

In order to learn the phase of fractured rock masses microscopic damage evolution under water pressure, this paper will study the permeability evolution caused by micro-structure characteristics changes, macroscopic mechanical behaviors caused by Seepage-damage interaction and the influence of rock fracture mechanism by means of numerical simulation.In this paper, we will develop the seepage-damage coupling analytical procedures which is based on FLAC3D, and it will also expand the research areas of FLAC3D software. This program can simulate and analyze the crack initiation, expansion and through evolution, and it can also study the seepage-damage coupling from analysis of stress state to analysis of failure process.This paper carried out the following research works:Firstly, it presents a description of seepage-damage coupling model and a kind of numerical simulation related to rock masses fracture, and establishes the basic equations of fluid-solid coupling interaction. It also shows a seepage-damage coupling numerical simulation program based former FLAC3D program.Secondly, it simulates the failure process of nonhomogeneous specimen with existing fractures under pore water pressure. By the dynamically showing the damage state, displacement field, stress field and seepage field graphics, it makes the study of fractured rock mass damage process more in-depth.Lastly, it simulates and analyze the tunnel excavation process under pore water pressure in a fractured rockmass invironment. According to the analysis of crack propagation process and pore pressure field evolution, the conclusion shows the influence to rock mass and lining stability which are caused by crack propagation and pore pressure.