Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Scale and Stress Effects on Permeability Tensor of Fractured Rocks with Correlated Fracture Length and Aperture
The effect of stress on the permeability tensor and Representative Elementary Volume (REV) of fractured rock masses is studied using a Discrete Element Approach (DEM). A new nonlinear model of rock fractures is developed for the prediction of normal stressnormal displacement behavior of fractures based on the correlation between fracture aperture and length distributions. The results show that at small differential stress ratios K (=horizontal/vertical stresses) the overall permeability of fracture networks is generally decreased. However, the contribution from a few large fractures of higher hydraulic conductivity prevents drastic reduction of the overall permeability, compare with DFN models of constant fracture apertures regardless of fracture trace length. With large values of differential stress ratios, the overall permeability of the DFN models is controlled by a combination of highly conductive larger fractures and fractures with shear slipping and dilation. With increasing differential stress ratios (K=1, 3, 4 and 5) the REV of a fractured rock may exist at much larger model sizes compared to the model without stress (K=0)
Scale and Stress Effects on Permeability Tensor of Fractured Rocks with Correlated Fracture Length and Aperture
The effect of stress on the permeability tensor and Representative Elementary Volume (REV) of fractured rock masses is studied using a Discrete Element Approach (DEM). A new nonlinear model of rock fractures is developed for the prediction of normal stressnormal displacement behavior of fractures based on the correlation between fracture aperture and length distributions. The results show that at small differential stress ratios K (=horizontal/vertical stresses) the overall permeability of fracture networks is generally decreased. However, the contribution from a few large fractures of higher hydraulic conductivity prevents drastic reduction of the overall permeability, compare with DFN models of constant fracture apertures regardless of fracture trace length. With large values of differential stress ratios, the overall permeability of the DFN models is controlled by a combination of highly conductive larger fractures and fractures with shear slipping and dilation. With increasing differential stress ratios (K=1, 3, 4 and 5) the REV of a fractured rock may exist at much larger model sizes compared to the model without stress (K=0)
Scale and Stress Effects on Permeability Tensor of Fractured Rocks with Correlated Fracture Length and Aperture
Shao, Jian‐Fu (Herausgeber:in) / Burlion, Nicolas (Herausgeber:in) / Baghbanan, A. (Autor:in) / Jing, L. (Autor:in)
19.02.2013
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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