(1. Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China；
2. School of Civil Engineering，Wuhan University，Wuhan，Hubei 430072，China)
Abstract：Basalt has extensive engineering applications，and studying its macroscale mechanical properties and wave velocity from the mineral crystal scale is of significant importance. Using a self-built microscale rock mechanics experimental system，including optical microscopy，tescan integrated mineral analyser，nanoindentation，and an atomic force microscope，this paper analyzes the mineral composition，microstructure，mineral crystals，and interphase mechanical properties of basalt. Based on the obtained microscale parameters，an accurate grain-based model of basalt was established. Through uniaxial compression simulations at the mineral crystal scale，the entire stress evolution process of basalt was analyzed，resulting in a macroscale elastic modulus of 53.59 GPa and a compressive strength of 166.84 MPa，which are in good agreement with experimental results. Additionally，wave velocity simulations at the mineral crystal scale were conducted to analyze the entire wave propagation process in basalt，and the P-wave velocity was calculated as 5.71 km/s，which is consistent with the measured P-wave velocity of 5.13 km/s. This paper demonstrates that obtaining macroscale mechanical properties and wave velocities of any size and shape rock from the mineral crystal scale is effective，based on the establishment of an accurate grain-based model using microscale rock mechanics experimental results. This method fills the gap in studying the macroscale mechanical properties and wave velocity response of basalt from the mineral crystal scale，providing a cross-scale research approach，and offering theoretical guidance for the engineering applications of basalt.
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2025, Vol. 44 
