Abstract
The sprayed concrete and surrounding rock will be impacted by seismic waves, air shock, and flying rock created by the drilling and blasting process used in mine and tunnel construction. The dynamic compression behaviors of concrete–rock combined body with six different inclination degrees (0, 30°, 45°, 60°, 75°, and 90°) were numerically simulated using LS-DYNA and the Holmquist–Johnson–Cook constitutive model in this work. The effect of the confining pressure (ECP) and strain rate (ESR) on the responses of the 3D meso-combined body were analyzed. Results indicated that the compressive strength of the combination can be improved, while the peak strain is lowered by increasing the contact inclination angle. The inclination dip determines the eventual failure mechanism of the specimens, and the final failure modes of the composite specimens with different dip angles can be divided into splitting failure, shear-compression composite failure, and shear failure. Finally, calculation results were compared with theoretical data published by R.E. Sheriff (1996). The research results are helpful to understand the dynamic failure law of lining confining pressure structure.
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Acknowledgements
The authors would like to acknowledge financial support from the National Natural Science Foundation of China (No. 41772277 and 41941019), the Fundamental Research Funds for the Central Universities, CHD (No. 300102269401), and “111” Center, program of the Ministry of Education of China (No. B18046).
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Gao, H., Zhai, Y. Numerical investigation of the concrete–rock combined body influence of inclined interface on dynamic characteristics and failure behaviors. Arab J Geosci 15, 435 (2022). https://doi.org/10.1007/s12517-022-09749-1
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DOI: https://doi.org/10.1007/s12517-022-09749-1