georefid:1997-016504SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=1997-016504<gco:CharacterString>A new geotechnical ring-shear device for the investigation of fault zone permeability; design and preliminary results</gco:CharacterString>1996-01-01publicationgeorefid:1997-016504Clennell, M. BenUniversity of Leeds, Department of Earth Sciences, Leeds, United KingdomauthorKnipe, Rob J.University of Wales, United KingdomauthorMaltman, Alex J.authorAmerican Association of Petroleum Geologists and Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United StatespublisherdocumentHardcopyIn: Anonymous, American Association of Petroleum Geologists 1996 annual convention528The 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).completedEconomic geology, geology of energy sourcesStructural geologyCascadia subduction zoneclastic sedimentsclaydesignEast Pacificevolutionfault zonesfaultsinstrumentsLeg 146North PacificNortheast PacificOcean Drilling ProgramPacific Oceanpermeabilitypermeameterspetroleum engineeringpore pressurepressurepropertiessandsedimentsshearshear strengthurn:org.iodp:exp:146urnlargerWorkCitationcampaignEnglishgeoscientificInformation-128.4300-120.021034.171548.4200