Geomechanics and Engineering

Techno-Press (테크노프레스)
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The influence of initial stress on wave propagation and dynamic elastic coefficients

  • Li, Xibing (School of Resources and Safety Engineering, Central South University) ;
  • Tao, Ming (School of Resources and Safety Engineering, Central South University)
  • Received : 2014.09.12
  • Accepted : 2014.12.10
  • Published : 2015.03.25
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Abstract

The governing equations of wave propagation in one dimension of elastic continuum materials are investigated by taking the influence of the initial stress into account. After a short review of the theory of elastic wave propagation in a rock mass with an initial stress, results indicate that the initial stress differentially influences P-wave and S-wave propagation. For example, when the initial stress is homogeneous, for the P-wave, the initial stress only affects the magnitude of the elastic coefficients, but for the S-wave, the initial stress not only influences the elastic coefficients but also changes the governing equation of wave propagation. In addition, the P-wave and S-wave velocities were measured for granite samples at a low initial stress state; the results indicate that the seismic velocities increase with the initial stress. The analysis of the previous data of seismic velocities and elastic coefficients in rocks under ultra-high hydrostatic initial stress are also investigated.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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