One of the key questions in the design of underground structures under water bodies is how hydraulic properties such as permeability change with depth, hence, the way in which effective stresses vary after excavation. In this study, a series of laboratory tests were carried out to investigate flow deformation characteristics for different stress conditions. Intact and jointed granite rock specimens with multiple cracks were tested under two different permeating fluids (air and water), using a high-pressure triaxial equipment. Effects of confining stress and axial stress on flow discharge and joint deformation were observed. Findings of this study reveal that flow volume decreases significantly with the increase of confining stress, irrespective of the permeating fluid. However, increase in confining stress beyond a critical value does not influence the flow rate, if the fractures or pores in the specimen have compressed to their minimum apertures or porosity.
|Title of host publication
|20th Century Lessons, 21st Century Challenges.
|G. Vouille, P. Berest
|Number of pages
|Published - 1999
|Interscience Conference on Antimicrobial Agents and Chemotherapy 1999 -
Duration: 17 Sept 1999 → 20 Sept 1999
Conference number: 40th
|Interscience Conference on Antimicrobial Agents and Chemotherapy 1999
|17/09/99 → 20/09/99