Influence of Pressure Change During Hydraulic Tests on Fracture Aperture
Article first published online: 23 JUL 2012
© 2012, The Author(s). Groundwater © 2012, National Ground Water Association
Volume 51, Issue 2, pages 298–304, March/April 2013
How to Cite
Ji, S.-H., Koh, Y.-K., Kuhlman, K. L., Lee, M. Y. and Choi, J. W. (2013), Influence of Pressure Change During Hydraulic Tests on Fracture Aperture. Groundwater, 51: 298–304. doi: 10.1111/j.1745-6584.2012.00968.x
- Issue published online: 6 MAR 2013
- Article first published online: 23 JUL 2012
- Received March 2012, accepted June 2012.
In a series of field experiments, we evaluate the influence of a small water pressure change on fracture aperture during a hydraulic test. An experimental borehole is instrumented at the Korea Atomic Energy Research Institute (KAERI) Underground Research Tunnel (KURT). The target fracture for testing was found from the analyses of borehole logging and hydraulic tests. A double packer system was developed and installed in the test borehole to directly observe the aperture change due to water pressure change. Using this packer system, both aperture and flow rate are directly observed under various water pressures. Results indicate a slight change in fracture hydraulic head leads to an observable change in aperture. This suggests that aperture change should be considered when analyzing hydraulic test data from a sparsely fractured rock aquifer.