Research On Influence Of The Morphology Of The Joint Surface On The Deformation And Seepage Behaviors Of Single Joint Rock Mass

It is fundamental scientific problem subjected to the engineering properties of the fracture rocks that researching the coupling hydro-mechanics of the single rocks fracture. Different dimension fracture have different engineering properties Under the dimension scale of RVE(Represent Volume Element), the morphology of rock fracture is play a important role in the mechanics, hydrology and coupled HM(Hydro-mechanics) of rock fracture. In this paper, it is main works that research the morphology of fracture effect on the mechanics, hydrology, coupled HM of single rock fracture by numerical stimulating method. Firstly, these studies carry out the random fractal math theory and the GIS-DEM technical to simulating and describing the 3D morphology of rock fracture by mesh discretion. Then this study revises T.Belem's theory to present a new method of simulating the roughness of rock fracture. Secondly, based on the effect on the morphology of rock fracture during mechanics and hydrology, this study establish the math model of compression and shear's deform and the revised cubic law of rock fracture by the view of semi-micro scopes. Then it use this model and the technical of GIS-DEM and FEM to connecting between morphology and mechanics or hydrology of rock fracture in macroscopic view and to put forward the method for simulating the coupling mechanics and hydrology of macroscopic rock fracture under the dimension scale of RVE. At last, this paper research the roughness of rock fracture effect on the coupling mechanics and hydrology by numerical test, then generalize the rule and formula for the contribution of the morphology of rock fracture to the coupling mechanics of hydro-mechanics in fracture. The main achievements are as follows:1. By referencing the random fractal math theory- Weierstrass-Mandelbrot function and using the simulating and analyzing technical of the 3D terrain(GIS-DEM), this study put forward the method of numerical simulating and analyzing the 3D surface and aperture of rock fracture. Based on T.Belem's theory, this study simplify and revise the 3D surface angularityθ_s, the apparent anisotropy of the surface Ka and the surface Z2 parameter Z 2_s, then bring forward to applying the roughness coefficient of 3D surface JRC, the 3D surface average angularity in shear orientationθ'_s and the apparent anisotropy of the surfaceκ'_αto numerical simulating the roughness of rock fracture surface. At last, this study discusses the relationship between the roughness coefficient of 3D surface J-RC and the fractal dimensionλ,D and put forward the math function of the relationship for the aperture distribution, the roughness of fracture surface and the rate of closure area.2. Based on Hertzian and Bushan's contact mechanics between globe and plate, it applied this theory to establish the semi-micro relation function between compression and normal deform (between shear stress and shear deform) for the sake of simulating the effect on the morphology of rock fracture during mechanics and seepage. Then, this study in macroscopic view research the roughness effect on the normal deform and shear deform of rock fracture, the relationship between the morphology and mechanics of rock fracture, the roughness influence in semi-micro mechanics under expand and un-expand of shear loading manner.3. This study establish the math model of the revised cubic law of rock fracture and local head loss by the view of semi-micro scopes. Then it use this model and the technical of GIS-DEM and FEM to simulating the influence of the morphology of rock fracture for the head, the flux, the flow vector of flowing in fracture under the dimension scale of RVE.4. This study use this model and the technical of GIS-DEM and FEM to connecting between morphology and mechanics or seepage of rock fracture in macroscopic view and to put forward the method for simulating the coupling mechanics and hydrology of macroscopic rock fracture under the dimension scale of RVE. Based on the above, this paper research the roughness of rock fracture effect on the coupling mechanics and hydrology by numerical test, then generalize the rule and formula for the contribution of the morphology of rock fracture to the coupling mechanics of hydro-mechanics in fracture.