Propagation Rule Of Crack Rock Mass And Its Mathematics Model Research Under The Seepage-Stress Coupling

There are many cracks which offer good condition for groundwater's motion, rest and storage in the crack rock mass. The cracks cause rock mass' complex mechanic and seepage property which is different from homogeneous material. It is difficult to show the crack's propagation in the seepage-stress coupling process by traditional seepage theory. So using the new theory and method to research seepage-stress coupling character of crack propagation becomes an attracted and challengeable difficulty in the domain of rock hydraulics.Reaching the seepage-stress coupling process of crack rock mass is very important to disclose crack's initiation rule, study crack's propagation and run-through mechanism and understand the rock mass' destabilization and damage reason. This also has utmost theory and engineering significance to improve geo-technical engineering design level, appraise engineering security and optimize the construction of tunnel and dam in the seepage-stress coupling process.PFC software is used to research crack's initiation and propagation from the mesoscopic aspect by the theory of particle flow code. The crack's initiation and propagation formula is established by macroscopic fracture mechanics. The formula is as the bridge of stress field and seepage field. By this bridge the seepage-stress coupling mathematics model is established. In details, this dissertation includes:1. The crack's propagation rule of crack rock mass is simulated by PFC software from mesoscopic without seepage. Two cracks propagation mechanism is analyzed in geometric position. The results of simulating are compared to laboratory results and they are very close. This proves that the PFC software is feasible to simulate crack propagation. At the same time the effect of mesoscopic parameter to macroscopic parameter is also analyzed.2. The single diagonal crack's propagation rule is simulated in the condition of seepage-stress coupling. The effect of different water pressure and lateral compression to single diagonal crack's propagation rule is studied. And two cracks'...