Experimental investigation reveals dynamic loading impacts on compressive strength in various rock types, suggesting new testing methods.
Understanding rocks’ dynamic deformation characteristics is crucial for clarifying impact failure and stress wave propagation mechanisms under high-speed loading, with significant theoretical value for rock mechanics and practical implications for mining, tunnel construction, and geohazard prevention. This study used a novel electromagnetic-loading split Hopkinson bar to perform dynamic tests on ten rock samples, investigating mechanical responses of different rock types under varying loads. This innovative technology addresses poor repeatability and low accuracy of traditional compressed air systems, providing a more reliable platform for rock dynamic research. Results show a significant correlation between unconfined compressive strength and elastic modulus, with high-strength rocks having higher moduli. Dynamic compressive strength differs from quasi-static results, shown by the nonlinear relationship between dynamic strength and elastic modulus. Rock strain behavior under dynamic loading is influenced by composition, microstructure, and loading rate, with distinct responses across rock types and strain rates. A complex strength–strain rate relationship exists: higher loads enable higher dynamic stresses, but not all samples show increased strain rates. This research deepens our understanding of rock dynamic behaviors, verifies electromagnetic loading feasibility and superiority in rock testing, and provides key support for optimizing engineering design, enhancing disaster control, and advancing rock mechanics and dynamic testing disciplines.
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Song et al. (2025) studied this question.
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