P-wave transmission across fractures with nonlinear deformational behaviour

X. B. Zhao, J. Zhao, J. G. Cai

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Abstract

Stress wave attenuation across fractured rock masses is a great concern of underground structure safety. When the wave amplitude is large, fractures experience nonlinear deformation during the wave propagation. This paper presents a study on normal transmission of P-wave across parallel fractures with nonlinear deformational behaviour (static Barton-Bandis model). The results show that the magnitude of transmission coefficient is a function of incident wave amplitude, nondimensional fracture spacing and number of fractures. Two important indices of nondimensional fracture spacing are identified, and they divide the area of nondimensional fracture spacing into three parts (individual fracture area, transition area and small spacing area). In the different areas, the magnitude of transmission coefficient has different trends with nondimensional fracture spacing and number of fractures. In addition, the study reveals that under some circumstances, the magnitude of transmission coefficient increases with increasing number of fractures, and is larger than 1.

Original languageEnglish
Pages (from-to)1097-1112
Number of pages16
JournalInternational Journal for Numerical and Analytical Methods in Geomechanics
Volume30
Issue number11
DOIs
Publication statusPublished - 1 Sep 2006
Externally publishedYes

Keywords

  • Fractures
  • Method of characteristics
  • Nonlinear deformational behaviour
  • Rock masses
  • Wave propagation

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