Townend, E and Thompson, BD and Benson, PM and Meredith, PG and Baud, P and Young, RP (2008) Imaging compaction band propagation in Diemelstadt sandstone using acoustic emission locations. Geophysical Research Letters , 35 (15) , Article L15301. 10.1029/2008GL034723.
![[img]](/style/images/fileicons/application_pdf.png)
| PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 272Kb |
Abstract
We report results from a conventional triaxial test performed on a specimen of Diemelstadt sandstone under an effective confining pressure of 110 MPa; a value sufficient to induce compaction bands. The maximum principal stress was applied normal to the visible bedding so that compaction bands propagated parallel to bedding. The spatio-temporal distribution of acoustic emission events greater than 40 dB in amplitude, and associated with the propagation of the first compaction band, were located in 3D, to within +/- 2 mm, using a Hyperion Giga-RAM recorder. Event magnitudes were used to calculate the seismic b- value at intervals during band growth. Results show that compaction bands nucleate at the specimen edge and propagate across the sample at approximately 0.08 mm s(-1). The seismic b-value does not vary significantly during deformation, suggesting that compaction band growth is characterized by small scale cracking that does not change significantly in scale.
| Type: | Article |
|---|---|
| Title: | Imaging compaction band propagation in Diemelstadt sandstone using acoustic emission locations |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1029/2008GL034723 |
| Publisher version: | http://dx.doi.org/10.1029/2008GL034723 |
| Language: | English |
| Additional information: | Copyright 2008 by the American Geophysical Union |
| Keywords: | Porous rock, Shear fracture, Localization, Deformation, Transition, Evolution, Granite, Failure, Cracks, Damage |
| UCL classification: | UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Earth Sciences |
View download statistics for this itemArchive Staff Only: edit this record