PRESENT SITUATION AND PROSPECT OF SEEPAGE STRESS COUPLING IN FRACTURED ROCK MASS

Abstract

Seepage-stress coupling in fractured rock mass is a hot and difficult issue in the field of rock mechanics and engineering research. Firstly, the research status of the experiments and mathematical models of the coupling of fractured rock mass were described systematically. Meanwhile, some common numerical analysis methods and their applications were summed up. Then the hotspots and engineering applications of coupling were summarized. According to the analysis of the research status of seepage-stress coupling, some suggestions were put forward:(1)In most of past researches, the relationship between permeability and normal stress were focused, and the effects study of shear stress or three dimensional stress on permeability were less. So the latter should be carried out. (2)In view of the difficulty of simulating the expansion of fractures by traditional numerical methods, new numerical methods that can consider the generation and expansion of fissures, such as meshless method, numerical manifold method and coupling analysis of FEM/DEM,should be developed. (3)Considering the mechanism and application study of multifield coupling of fractured rock mass in special environment, such as high or low temperature, chemical corrosion, et al. And the characteristics of rock such as heterogeneity, rheological properties should also be taken into account. (4)Although there were disparity between the existing models and the actual situations, the theories should also be fully utilized to make the design and analysis of the project more reasonable.