Abstract
A numerical model based on two-dimensional Discrete Element Method (DEM) has been used to study the compression of rock under different loading rates, and a visco-elastic Flat-Joint constitutive law has been developed to describe the dynamic behavior of bonded contact between particles. The improved DEM model consists of two parts: (1) Force-displacement equations are derived on the basis of a visco-elastic constitutive model which is formed with a spring and a Maxwell system, and (2) A dynamic fracture criterion of bond is develop to define the increase of strength. The controlling variable method is used to analyze the impact of visco-elastic parameters on the dynamic mechanical properties. With different parameters this model could be used to simulate the compression of rock materials under different loading rates. As an example, visco-elastic parameters of granite are identified, and the obtained stress-strain curves well reproduce the laboratory results.
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He, X. et al. (2021). A Visco-Elastic DEM Model of Rock Under Different Loading Rates. In: Barla, M., Di Donna, A., Sterpi, D. (eds) Challenges and Innovations in Geomechanics. IACMAG 2021. Lecture Notes in Civil Engineering, vol 125. Springer, Cham. https://doi.org/10.1007/978-3-030-64514-4_41
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DOI: https://doi.org/10.1007/978-3-030-64514-4_41
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