Acta Metallurgica Sinica
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HUANGYehuan,LIU Chun,ZHANG Xiaoyu,QIN Yan,DENGShang
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Abstract: In numerical simulation of uniaxial compression, the loading rate is controlled by the variation range of boundary conditions and the balance time after each change of boundary conditions. At the same loading rate, different combinations of the two factors will have a great different on the loading effect. Therefore, exploring the influence mechanism of the above two factors on the numerical simulation test of rock uniaxial compression can play a positive role in doing the efficient and high-precision numerical simulation test under various loading rates. Using the MatDEM software, based on the loading area and standard equilibrium iteration which set by the software automatically, changing the division number Nd and balance rate Rb to alter the loading rates of the uniaxial compression numerical simulation tests. Through the analysis of the simulation results, the following conclusions can be obtained: (1) After one-step loading, the more number of equilibrium iterations are, the more sufficient the propagation of the stress wave and kinetic energy equals 0.8), the kinetic energy will decay sufficiently in each step, and the quasi-static simulation results can be obtained with the lowest amount of calculation. (2) The smaller the stress increment of single-step loading is (the greater the Nd), the more accurate numerical simulation results are. (3) When the loading rate is fixed and the amount of calculation is the same, loading schemes with low single-step stress increment and lower balance iteration times (large Nd and small Rb) after single-step loading should be adopted to ensure the accuracy of numerical simulation test. This paper provides a reference for quantitative study of rock loading rate and related numerical simulation.
Key words: Discrete element method, MatDEM, uniaxial compression, loading rate
HUANGYehuan,LIU Chun,ZHANG Xiaoyu,QIN Yan,DENGShang. Numerical Simulation Study on Influence of Loading Rate on Rock Uniaxial Compression Test[J]. Acta Metallurgica Sinica.
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URL: https://geology.nju.edu.cn/EN/
https://geology.nju.edu.cn/EN/Y2019/V25/I3/423