Influence of Initial Microcracks on the Dynamic Mechanical Characteristics of Sandstone
Geomechanics and Geophysics for Geo-Energy and Geo-Resources（2022）
Wuhan University
Abstract
Microcracks are pervasive within rock in active fault zone or geotechnical engineering and strongly influence the dynamic characteristics of rock. Here we performed dynamic compression test of sandstone to clarify the effect of initial microcracks on the mechanical performance. The different initial microcrack density levels were generated by repetitive impact loading, which was quantified using an image process method based on scanning electron microscope. Then, the strength, fragmentation, fracture propagation and energy dissipation of sandstone with different initial microcrack densities were studied using Split Hopkinson Pressure Bar apparatus. Results reveal that the strength of sandstone decreases with the increase microcrack density at a given strain rate, while, the dynamic increase factor of sandstone increases with increasing microcrack density. The sensitivity of fragmentation fractal dimension and dissipated energy to strain rate depend on the initial microcracks density. Moreover, the fractal dimension of fragmentation becomes more sensitive to the energy absorption with the increase of initial microcrack density. The present results contribute to understand the evolution of active fault and safety evaluation of geotechnical engineering.
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Key words
Initial microcracks,Pulverization,Microcrack density,Fractal dimension,Dissipated energy
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