A further study on seismic response of a set of parallel rock fractures filled with viscoelastic materials

Published on Feb 1, 2013in Geophysical Journal International2.574
· DOI :10.1093/GJI/GGS055
Wei Wu56
Estimated H-index: 56
(EPFL: École Polytechnique Fédérale de Lausanne),
Jianbo Zhu25
Estimated H-index: 25
(California Institute of Technology),
Jian Zhao63
Estimated H-index: 63
(EPFL: École Polytechnique Fédérale de Lausanne)
The purpose of this study is to further investigate the seismic response of a set of parallel rock fractures filled with viscoelastic materials, following the work by Zhu et al. Dry quartz sands are used to represent the viscoelastic materials. The split Hopkinson rock bar (SHRB) technique is modified to simulate 1-D P-wave propagation across the sand-filled parallel fractures. At first, the displacement and stress discontinuity model (DSDM) describes the seismic response of a sand-filled single fracture. The modified recursive method (MRM) then predicts the seismic response of the sand-filled parallel fractures. The SHRB tests verify the theoretical predictions by DSDM for the sand-filled single fracture and by MRM for the sand-filled parallel fractures. The filling sands cause stress discontinuity across the fractures and promote displacement discontinuity. The wave transmission coefficient for the sand-filled parallel fractures depends on wave superposition between the fractures, which is similar to the effect of fracture spacing on the wave transmission coefficient for the non-filled parallel fractures.
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Keywords: Split Hopkinson rock bar ; Loading rate ; Stress wave ; Rock joints Reference EPFL-ARTICLE-176969doi:10.1007/s00603-011-0212-zView record in Web of Science URL: http://www.springerlink.com/content/6368x8x2v2533u63/ Record created on 2012-05-11, modified on 2017-12-10
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