9cb7598b-b3c1-06fe-e054-002128a47908 English nonGeographicDataset non geographic dataset British Geological Survey +44 115 936 3100 Environmental Science Centre,Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk pointOfContact 2026-03-09 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13607574 Experimental direct shear friction dataset for synthetic clay gouges (NERC grant NE/L002469/1) 2020-01-10 creation http://data.bgs.ac.uk/id/dataHolding/13607574 Friction coefficient and frictional stability (rate & state parameter) data for triaxially compressed direct shear experiments on kaolinite-rich china clay and Mg-montmorillonite fault gouges (<2micron grain size). A total of 19 raw experimental datasets are presented as detailed in the index files: 13 on kaolinite-rich china clay, and 6 on cation-exchanged Mg-Montmorillonite. The raw data files, logged at either 1 or 2Hz, comprise confining pressures, upstream and downstream fluid pressures, force experienced by the direct shear assembly during triaxial compression, and absolute volumes of the confining pressure and fluid pressure reservoirs. Data is provided as measured by gauges in the pressure vessel in Volts, and also as calculated in MPa, kN and mm3. Also presented are the outputs of MATLAB models run to simulate the rate and state parameters k, a, b, dc and f0 for each experiment, with error data presented as 2sigma and standard error values. Parameters were determined using a non-linear least-squares fitting routine with the machine stiffness treated as a fitting parameter (c.f. Noda and Shimamoto, 2009). Data were fit by a single set of state variables (a, b, dc) with a linear detrend. Also presented are the outputs of Specific Thermogravimetric Analyses on kaolinite-rich china clay and Mg-montmorillonite. Vaughan, Professor D J University of Manchester Earth Atmosphere and Env Sciences not available principalInvestigator Steven Beynon University of Liverpool Department of Environmental Sciences Jane Herdman Building, 4 Brownlow Street Liverpool L69 3GP not available originator Enquiries British Geological Survey United Kingdom not available distributor Enquiries British Geological Survey United Kingdom not available pointOfContact notApplicable https://resources.bgs.ac.uk/images/geonetworkThumbs/9cb7598b-b3c1-06fe-e054-002128a47908.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Friction (geomechanics) Kaolinite Rock deformation Montmorillonite Shear properties Compression tests Clays Saturation BGS Thesaurus of Geosciences 2022 revision NGDC Deposited Data dataCentre NERC_DDC otherRestrictions no limitations The dataset is made freely available for access, e.g. via the Internet. Either no third party data / information is contained in the dataset or BGS has secured written permission from the owner(s) of any third party data / information contained in the dataset to make the dataset freely accessible. otherRestrictions The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused. Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" English geoscientificInformation 2017-12-01 2018-11-01 Microsoft Excel witheld Enquiries British Geological Survey United Kingdom not available distributor https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item132045 WWW:DOWNLOAD-1.0-http--download Data download nonGeographicDataset non geographic dataset INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology 2011 publication See the referenced specification false Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF false Direct shear experiments were performed on 2 clay gouges (<2microns grain size) in a triaxial pressure vessel. Samples were sheared between two stainless steel sliders, with fluid/vacuum controlled via porous sintered discs. Tests were run under the following experimental conditions for each sample, at a confining pressure (Pc) of 60 MPa unless otherwise indicated: 1. Saturated with deionised water (80 MPa Pc, 20 MPa fluid pressure (Pf)); 2. At room humidity; 3. At room humidity with a vacuum applied to the sample assembly; 4. Vacuum oven dry (to 130ºC for 20 hours, then cooled to room temperature under vacuum); 5. Vacuum oven dry (to 130ºC for 20 hours, then cooled to room temperature under vacuum) with a vacuum applied to the sample assembly; 6. At room humidity, taken to 130ºC in the sample assembly under vacuum for ~20 hours and allowed to cool, and then run under vacuum.