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Dynamic response of a rock fracture filled with viscoelastic materials

Wu, W. and Zhu, J. B. and Zhao, J. (2013) Dynamic response of a rock fracture filled with viscoelastic materials. Engineering Geology, 160 . pp. 1-7. ISSN 0013-7952. doi:10.1016/j.enggeo.2013.03.022.

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Rock fractures filled with viscoelastic materials, such as sand, usually contribute to rock mass instability under the influence of seismic waves and dynamic loads. The purpose of this study is to verify that the specific fracture stiffness and the specific initial mass of the filling sand are two key fracture parameters in interrelating the physical, mechanical and seismic properties of a rock fracture filled with dry sand. A series of dynamic tests using a split Hopkinson rock bar was conducted on a simulated sand-filled fracture. The experimental results show that stress wave attenuation across the filled fracture is strongly affected by wave reflection and transmission at the fracture interfaces and the dynamic compaction of the filling sand. With the comparison between the analytical predictions by the displacement discontinuity model and the displacement and stress discontinuity model and the experimental results from the laboratory tests, it is found that both models can predict a filled fracture with a smaller thickness (i.e., less than 10 mm). The displacement and stress discontinuity model may be used to predict a fracture with a larger thickness by considering the specific initial mass of filling materials. The wave transmission coefficient for a filled fracture generally increases with increasing specific fracture stiffness.

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Additional Information:© 2013 Elsevier B.V. Received 30 November 2012; Received in revised form 18 March 2013; Accepted 30 March 2013; Available online 8 April 2013. This work is sponsored by the Swiss National Science Foundation (200021_124846).
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)200021_124846
Subject Keywords:P-wave propagation; Filled rock fracture; Specific initial mass; Specific fracture stiffness; Wave transmission coefficient
Record Number:CaltechAUTHORS:20130718-080121666
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Official Citation:W. Wu, J.B. Zhu, J. Zhao, Dynamic response of a rock fracture filled with viscoelastic materials, Engineering Geology, Volume 160, 27 June 2013, Pages 1-7, ISSN 0013-7952,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39431
Deposited By: Tony Diaz
Deposited On:18 Jul 2013 15:42
Last Modified:09 Nov 2021 23:44

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