Experimental study on stress wave interaction with rock fractures

Wei Wu, Qianbing Zhang, Jianbo Zhu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

A split Hopkinson rock bar is developed and utilized to characterize the interaction between stress wave and artificial rock fractures. The non-filled contact fracture is assumed to be the direct contact interface between the incident bar (rear end) and the transmitted bar (front end), while the filled fracture is simulated by inserting a layer of filling materials, e.g., sand and clay, in the opening at the interface of two bars. The experimental results show that the non-filled contact fracture displays stress equilibrium and displacement discontinuity, however, the filled fracture exhibits stress and displacement discontinuities. The transmission coefficient for the non-filled contact fracture increases with higher loading rate. The filled fracture displays lower strength and larger deformation than the non-filled contact fracture, which likely induces the instability of rock masses. The transmission coefficient for the filled fracture decreases with increasing thickness of the filling materials, and the transmission coefficient for the sand-filled fracture is larger than that for the clay-filled fracture. It is found that stress wave attenuate much highly due to the large fracture aperture and the low stiffness filling materials.
Original languageEnglish
Title of host publication46th US Rock Mechanics / Geomechanics Symposium 2012
Pages2119-2125
Number of pages7
Volume3
Publication statusPublished - 1 Dec 2012
Externally publishedYes
Event46th US Rock Mechanics / Geomechanics Symposium 2012 - Chicago, IL, United States
Duration: 24 Jun 201227 Jun 2012

Conference

Conference46th US Rock Mechanics / Geomechanics Symposium 2012
Country/TerritoryUnited States
CityChicago, IL
Period24/06/1227/06/12

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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