caa a22 4500 44581537X CHVBK 20180317145226.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s10040-011-0728-z doi (NATIONALLICENCE)springer-10.1007/s10040-011-0728-z Hydromechanical behavior during constant-rate pumping tests in fractured gneiss [Elektronische Daten] [Todd Schweisinger, Erik Svenson, Lawrence Murdoch] Comportement hydromécanique d'un gneiss fracturé durant des pompages d'essai à débit constant Deformation and fluid pressure during constant-rate pumping tests were characterized by sensitivity analyses using a theoretical model of a deformable fracture, and by conducting and analyzing field tests at a site underlain by fractured biotite gneiss in western South Carolina, USA. The sensitivity analysis indicates that displacement is a hysteretic function of fluid pressure during constant-rate pumping tests, and the signals are affected by properties of the fracture (normal stiffness, aperture, and heterogeneities in the fracture plane) and enveloping rock (elastic modulus and permeability). The field tests used a removable borehole extensometer to measure axial displacements in the pumping well. The field results are generally similar to simulations, and the hydraulic and mechanical properties obtained by inversion of the pumping test results are essentially the same as results from hydromechanical slug tests. The observed displacements early in the pumping tests are less than, whereas late in the test they are greater than predicted values assuming a uniform fracture. This difference can be explained as a consequence of preferential flow within the fracture. These results indicate that displacements in a wellbore are sensitive to details of fracture connectivity and preferential flow that are difficult to detect through the pressure signal alone. Springer-Verlag, 2011 Crystalline rock nationallicence Fractured rock nationallicence Inverse modeling nationallicence Hydraulic testing nationallicence USA nationallicence Schweisinger Todd Department of Mechanical Engineering, 102 Fluor Daniel Engineering Innovation Building, Clemson University, 29634, Clemson, SC, USA aut Svenson Erik CH2M HILL, 9428 Baymeadows Road Suite 300, 32256, Jacksonville, FL, USA aut Murdoch Lawrence Department of Environmental Engineering and Earth Sciences, 340 Brackett Hall, Clemson University, 29634, Clemson, SC, USA aut Hydrogeology Journal Springer-Verlag 19/5(2011-08-01), 963-980 1431-2174 19:5<963 2011 19 10040 https://doi.org/10.1007/s10040-011-0728-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-011-0728-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schweisinger Todd Department of Mechanical Engineering, 102 Fluor Daniel Engineering Innovation Building, Clemson University, 29634, Clemson, SC, USA aut NATIONALLICENCE 700 1- Svenson Erik CH2M HILL, 9428 Baymeadows Road Suite 300, 32256, Jacksonville, FL, USA aut NATIONALLICENCE 700 1- Murdoch Lawrence Department of Environmental Engineering and Earth Sciences, 340 Brackett Hall, Clemson University, 29634, Clemson, SC, USA aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/5(2011-08-01), 963-980 1431-2174 19:5<963 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer