An experimental study on stress wave propagation and attenuation of sandstone during stress unloading process

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (8) : 151-158.

CHENG Yun1,SONG Zhanping1,2,JIN Jiefang3,WANG Junbao1,2,YANG Tengtian2,4

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Abstract:Due to the complexity of excavation and unloading of rock mass and redistribution of original rock stress, surrounding rock mass was usually in complex stress unloading environment.For the purpose of investigating the propagation and attenuation characteristics of stress wave in sandstone during stress unloading process, a strip specimen with length to diameter ratio L/D≈65 was designed, and small disturbance impact tests under different axial unloading stresses were carried out by dynamic and static combined loading test devices.The stress wave signals of sandstone were measured, and the effects of different unloading stress on wave waveform, P-wave velocity, temporal-spatial attenuation characteristics, wave peak, and attenuation rate of wave peak were studied, and the empirical models were established.The results show that whether the sandstone had unloading stress or not had significant effect on waveforms.With the stress unloading, the P-wave velocities attenuated in the form of “approximately linearly stage+nonlinear stage”, and wave peak and its attenuation rate were exponentially changed.With the increase of distance and time, the wave peaks show an exponential attenuation, and temporal-spatial attenuation of wave peaks at different unloading stress stages had different sensitivity.

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stress wave / waveform / P-wave velocity / wave peak / attenuation characteristics

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CHENG Yun1,SONG Zhanping1,2,JIN Jiefang3,WANG Junbao1,2,YANG Tengtian2,4. An experimental study on stress wave propagation and attenuation of sandstone during stress unloading process[J]. Journal of Vibration and Shock, 2020, 39(8): 151-158

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