Numerical Analysis of Dynamic Mechanical Characteristics of  Brazilian Splitting of Coal-Rock Combination Bodies

MA Sizhou; LIU Kewei; GUO Tengfei; HUANG Xiaohui; ZHOU Zhanxing

doi:10.11858/gywlxb.20220589

Volume 36 Issue 5

Oct 2022

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Chinese Journal of High Pressure Physics > 2022 > 36(5): 054204.

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MA Sizhou, LIU Kewei, GUO Tengfei, HUANG Xiaohui, ZHOU Zhanxing. Numerical Analysis of Dynamic Mechanical Characteristics of Brazilian Splitting of Coal-Rock Combination Bodies[J]. Chinese Journal of High Pressure Physics, 2022, 36(5): 054204. doi: 10.11858/gywlxb.20220589

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Numerical Analysis of Dynamic Mechanical Characteristics of Brazilian Splitting of Coal-Rock Combination Bodies

doi: 10.11858/gywlxb.20220589

School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China

Received Date: 18 May 2022
Rev Recd Date: 25 May 2022

Available Online: 20 Sep 2022

Issue Publish Date: 11 Oct 2022

Abstract

Abstract

In order to investigate the dynamic mechanical characteristics of coal-rock composite engineering body under impact load, the basic mechanical parameters of pure coal and pure rock were obtained by laboratory tests for determining the parameters of HJC model. Based on the validity verification of the material model, LS-DYNA was employed to study the stress wave propagation features, failure process and failure characteristics of coal-rock combination bodies in dynamic splitting process considering the effects of impact loads, impact directions and loading angles. The results showed that: (1) the stress wave shapes of R-C and C-R samples are almost the same for different impact directions, but the stress amplitudes are slightly different. The comparison results showed that the incident wave amplitudes are similar, but for R-C samples, the amplitude of reflected wave is larger while that is smaller of transmitted wave. The difference gradually decreases with the increasing impact loads. (2) Under the action of different impact loads, the coal part is mainly damaged in the process of splitting, and the cracks generally appear in the coal part far from the interface, while the rock part commonly is damaged at the near side of the interface. (3) The failure modes of C-R and R-C samples are similar and mainly tensile and shear when the impact load is relatively low. The damage degree of the combination body is aggravated with increasing load, and the difference of failure modes becomes more obvious. (4) A method using the number of failure elements as an evaluation index is proposed to quantitatively analyze the breakage degree of the combination bodies. According to the numerical simulation results, the combination body damaged most seriously for the loading angle of 45°.
- coal-rock combination body,
- dynamic splitting,
- HJC model,
- failure characteristics,
- failure process

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Numerical Analysis of Dynamic Mechanical Characteristics of Brazilian Splitting of Coal-Rock Combination Bodies

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Numerical Analysis of Dynamic Mechanical Characteristics of Brazilian Splitting of Coal-Rock Combination Bodies

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