Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Coupled stress-flow properties of rock joints from hydraulic field testing
This thesis describes a method for in situ determination of the coupled stress-flow properties of rock joints by a combination of hydraulic tests in single boreholes and coupled numerical modeling. The method was applied to joints located at a depth of 80 to 417 meters in granitic rock intersecting a vertical borehole. A stress-transmissivity relationship for joints is derived based on an empirical stress-normal displacement model and a linear relationship between normal displacement and hydraulic aperture. Three parameters define this relationship: initial hydraulic aperture, effective normal stress, and joint normal stiffness. Each of the parameters can be determined from a combination of hydraulic field tests and numerical simulation with a coupled hydro mechanical finite element program. The results of the study indicate that the normal stiffness of the joint depends on the size of the fracture surface area. However, it is likely that the present method of field testing gives a stress-transmissivity relationship which is representative for the entire fracture plane. 48 refs, 7 figs, 3 tabs. (Atomindex citation 27:020198)
Coupled stress-flow properties of rock joints from hydraulic field testing
This thesis describes a method for in situ determination of the coupled stress-flow properties of rock joints by a combination of hydraulic tests in single boreholes and coupled numerical modeling. The method was applied to joints located at a depth of 80 to 417 meters in granitic rock intersecting a vertical borehole. A stress-transmissivity relationship for joints is derived based on an empirical stress-normal displacement model and a linear relationship between normal displacement and hydraulic aperture. Three parameters define this relationship: initial hydraulic aperture, effective normal stress, and joint normal stiffness. Each of the parameters can be determined from a combination of hydraulic field tests and numerical simulation with a coupled hydro mechanical finite element program. The results of the study indicate that the normal stiffness of the joint depends on the size of the fracture surface area. However, it is likely that the present method of field testing gives a stress-transmissivity relationship which is representative for the entire fracture plane. 48 refs, 7 figs, 3 tabs. (Atomindex citation 27:020198)
Coupled stress-flow properties of rock joints from hydraulic field testing
J. Rutqvist (Autor:in)
1995
39 pages
Report
Keine Angabe
Englisch
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