Abstract
External stresses, i.e., compressive, shear and tensile stresses, strongly affect seismic wave propagation across rock joints. The present study experimentally investigates the effects of tensile stresses on wave behaviors across single natural rock joints by simultaneously conducting ultrasonic measurements and direct tensile tests. Laboratory results show that increasing tensile stress causes decreases in transmission coefficient and spectral amplitudes for both ultrasonic P- and S-waves. Additionally, for the weaker joint under tension, wave velocity is evidently reduced by the increasing tensile stress. The comparison of measured spectra with theoretically predicted spectra indicates that ultrasonic wave properties of single rock joints under tension could be well described by the displacement discontinuity model (DDM). It is also found that values of joint static and dynamic specific stiffness decrease with increasing tensile stress.
Published Version
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