A new geotechnical ring-shear device for the investigation of fault zone permeability; design and preliminary results

Author(s): Clennell, M. Ben; Knipe, Rob J.; Maltman, Alex J.
Author Affiliation(s): Primary:
University of Leeds, Department of Earth Sciences, Leeds, United Kingdom
University of Wales, United Kingdom
Volume Title: American Association of Petroleum Geologists 1996 annual convention
Source: Annual Meeting Expanded Abstracts - American Association of Petroleum Geologists, Vol.5, p.28; American Association of Petroleum Geologists 1996 annual convention, San Diego, CA, May 19-22, 1996. Publisher: American Association of Petroleum Geologists and Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States. ISSN: 0094-0038 CODEN: APGAB2
Note: In English
Summary: The ring-shear permeameter designed by Kevin M. Brown and others at the University of Birmingham demonstrated the feasibility of torsional shear methods for the investigation of the hydrogeological properties of fault zones. The new permeameter described here is based on the much larger Imperial College ring-shear device. While it operates at lower effective stresses (2 as opposed to 20 megapascals), the Leeds device has a larger sample chamber that enables sandy, as well as fine-grained sediments, to be tested. The sealed chamber is split into upper and lower halves, which rotate relative to one another, so that the sample fails along a horizontal mid-plane. This feature enables accurate shear strength determinations to be made, and also allows the measurement, or control, of mid-plane pore fluid pressure during tests. Preliminary results of peak strength, residual shear strength, volumetric history, pore-pressure and permeability evolution are reported for clays, sand-clay mixtures and remoulded samples of silty clay from Ocean Drilling Program Leg 146 (Cascadia accretionary wedge).
Year of Publication: 1996
Research Program: ODP Ocean Drilling Program
Key Words: 16 Structural Geology; 29 Economic Geology, Energy Sources; Cascadia subduction zone; Clastic sediments; Clay; Design; East Pacific; Evolution; Fault zones; Faults; Instruments; Leg 146; North Pacific; Northeast Pacific; Ocean Drilling Program; Pacific Ocean; Permeability; Permeameters; Petroleum engineering; Pore pressure; Pressure; Properties; Sand; Sediments; Shear; Shear strength
Coordinates: N341715 N484200 W1200210 W1284300
Record ID: 1997016504
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States