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| Study on compression characteristics of columnar jointed rock mass by 3D Voronoi-based discrete element model |
| NIU Zihao1，2，ZHU Zhende1，2，QUE Xiangcheng1，2，LU Wenbin1，2 |
| (1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. Jiangsu Research Center for Geotechnical Engineering Technology，Hohai University，Nanjing，Jiangsu 210098，China) |
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Abstract Columnar jointed basalt shows highly anisotropic characteristics in strength and deformation modulus，and hence，understanding its physical and mechanical properties is of great significance to engineering safety. According to the natural structural characteristics of columnar jointed rock mass，a three-dimensional polycrystalline discrete element model including double joint networks was established. Using this model，the mechanical properties and failure modes of columnar jointed rock mass under uniaxial conditions were explored. Then，the compression failure simulation of rock mass with specific dip angle under three-dimensional stress conditions was carried out. It is shown that the numerical simulation results are in good agreement with the experimental results，and the samples show three typical failure modes. Under the condition of three-phase stress，the stress-strain curve shows obvious multistage and anisotropy，and the volumetric strain ?V shows dilatancy. After unloading in the ?3 direction，the peak strength and corresponding elastic strain of columnar jointed rock mass decrease significantly，while the brittleness index of the specimen increases significantly. The failure mode presents brittle failure extending from the unloading plane to the center，and the proportion of the dissipated energy increases in energy evolution. The evolution process of microcracks reflects that the degradation process of columnar jointed rock mass presents progressive failure characteristics，and the intermediate principal stress has a promoting effect on the slip failure of the inter column joint plane.
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2022, Vol. 41 
