Mechanical properties of saw-cut Westerly Granite during injection from a borehole in a laboratory sample (NERC grant NE/K009656/1)
This dataset is used and fully described/interpreted in the paper: Passelegue, F. X., N. Brantut, T. M. Mitchell, Fault reactivation by fluid injection: Controls from stress state and injection rate, submitted to Geophys. Res. Lett. Text files contain raw and processed data. Mechanical data are raw. Load needs to corrected (offset) from piston friction, measured at the beginning of each run before the hit point. Axial displacement is converted into sample shortening by correcting the load from machine stiffness, which is equal to 480 kN/mm (calibrated on Mon. 14 Mar. 2016). Data include a set of elastic wave first arrival times, obtained from time of flight measurements using an array of piezoelectric transducers and the cross-correlation method detailed in Brantut (2015) (see reference above). Two separate files correspond to mechanical data from experiments conducted at 50 and 100 MPa confining pressure (""mech_Pc=???MPa.txt""). One file (""sensors.txt"") contains the initial positions of each piezoelectric transducer. Files named ""wave_?_Pc=100MPa.txt"" (?=1,2,3 or 4) contain time series of arrival times during the four injections conducted at Pc=100MPa. Each column consists in the time-of-flight between a given pair of sensors (x->y, where x is the index of source sensor, and y is the index of the receiver sensor, as per their numbering in the ""sensors.txt"" file.) In all the data files, the first column corresponds to a common time basis, in seconds.
nonGeographicDataset
https://www.bgs.ac.uk/services/ngdc/accessions/index.html#item118269
function: download
http://data.bgs.ac.uk/id/dataHolding/13607384
eng
geoscientificInformation
publication
2008-06-01
Granite
Fluid flow
revision
2011
NERC_DDC
2016-10-26
2016-10-28
creation
2018-09-13
notApplicable
Rock type - Westerly Granite, saw-cut at 30 degrees from the compression axis. A 4mm diameter borehole was drilled 4.5mm off the sample edge, connecting the bottom of sample to fault plane. Apparatus - Oil-medium triaxial apparatus (Rock Physics Ensemble, University College London). For full description, see: Brantut N. (2015), Time-dependent recovery of microcrack damage and seismic wave speeds in deformed limestone, J. Geophys. Res., 120, doi:10:1002/2015JB012324.
publication
2011
false
See the referenced specification
publication
2010-12-08
false
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
.txt
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.
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