TRACER TRANSPORT IN A ROUGH ROCK FRACTURE DURING SHEAR —A NUMERICAL STUDY
The effects of translational shear on particle transport under coupled shear-flow testing conditions in a rough rock fracture were numerically investigated in this study. A pair of digitalized surfaces of a rough concrete fracture replica was numerically manipulated to simulate the translational shearing process without considering normal loading and asperity damage. From the evolutions of the aperture field during shear, the evolutions of the fracture transmissivity field were determined. Unidirectional and bidirectional fluid flow situations were considered, using Finite Element Method (FEM). The results show that translational shear makes rough fractures more permeable, producing a significant change in travel time of the particles. Translational shear yields a significant channelling effect in the direction perpendicular to the shear direction. Bi-directional flow patterns show clearly the shortcomings of the conventional laboratory shear-flow tests with unidirectional flow. These simulations provide a first step towards a better understanding of particle transport in rock fractures.
T.Koyama V.Vilarrasa L.Jing
Engineering Geology and Geophysics Research Group, Royal Institude of Technology (KTH), Stockholm, Sweden
国际会议
南京
英文
349-354
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）