Abstract
This paper describes a liquid application device used in combination with a split Hopkinson pressure bar (SHPB) to perform a series of dynamic tests investigating stress wave propagation through a fully saturated rock joint under undrained conditions. The characteristics of the filling-liquid dynamic response are also analyzed. Granite is used as the experimental material for the rock joint and a dynamic load is applied by the SHPB device to simulate the interaction between a stress wave and the liquid-filled rock joint. In addition, a polymethyl methacrylate (PMMA) sample of the same size as the granite is used for comparative analysis. The initial thickness of the filling liquid is altered by adjusting the sample joint spacing. The transmission coefficient of a stress wave in the liquid-filled rock joint is defined to evaluate the wave attenuation and to analyze the characteristics of the filling liquid’s dynamic response. The experimental results obtained for granite and PMMA demonstrate that the transmission coefficient decreases with increasing liquid filling thickness. As the initial thickness of the filling liquid increases, the peak liquid pressure increases. There is a negative correlation between the peak water pressure value and the transmission coefficient.
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Abbreviations
- \(\varepsilon_{{ 1 {\text{st,In}}}} ,\;\varepsilon_{{ 1 {\text{st,Tr}}}}\) :
-
First incident wave peak strain, first transmitted wave peak strain
- PWP :
-
Peak pressure of filling liquid
- t :
-
Initial thickness of filling liquid
- TR :
-
Transmission coefficient
- K :
-
Transmission-wave peak strain value amplification factor
- \({\Delta}TR_{ 1} ,\;{\Delta}TR_{ 2} ,\;{\Delta}TR_{ 3}\) :
-
Degree of variation in transmission coefficient influenced by the metal-material, material-water-material, and material-metal contact surfaces, respectively
- \(TR_{\text{Original}}\) :
-
Transmission coefficient directly obtained from the test
- \({\Delta}TR_{{{\text{Metal}} - {\text{Material}}}}\) :
-
Degree of variation in transmission coefficient influenced by the uniform contact surface between the metal bars and sample
- \({\Delta}TR_{{{\text{Filling}}\,{\text{liquid}}}}\) :
-
Degree of variation in transmission coefficient influenced by the presence of liquid filling layer
- \(TR_{\text{Corrected}}\) :
-
Transmission coefficient after correcting the influence of the contact surface between the metal bars and sample
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Acknowledgements
The National Key Research and Development Plan (Grant No. 2018YFC1504801), the National Natural Science Foundation Outstanding Youth Foundation (Grant No. 51522903) and the National Natural Science Foundation of China (Grant No. 51479094, 41772246) are gratefully acknowledged.
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Huang, J., Liu, X., Zhao, J. et al. Propagation of Stress Waves Through Fully Saturated Rock Joint Under Undrained Conditions and Dynamic Response Characteristics of Filling Liquid. Rock Mech Rock Eng 53, 3637–3655 (2020). https://doi.org/10.1007/s00603-020-02126-y
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DOI: https://doi.org/10.1007/s00603-020-02126-y