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煤岩动力灾害严重威胁着煤矿的安全高效生产,研究煤岩材料在复杂应力状态下的动态力学性能对煤岩动力灾害的预测预防有重要意义。利用有限元分析软件LS-DYNA,采用岩石的Holmquist-Johnson-Cook(HJC)本构模型,对煤岩SHPB实验进行数值模拟,在模拟结果与实验结果相似性较好的基础上,对煤岩SHPB被动围压实验进行数值模拟。结果表明:围压套筒的弹性模量、厚度、摩擦因数及套筒与试件的间隙对煤岩材料的动态力学性能有显著影响。根据研究成果,在工程中可为煤柱增加一外加层,通过合理设计外加层的弹性模量、厚度、间隙及摩擦因数等参数,增强煤柱的抗冲击能力。
Coal-rock dynamic disasters seriously threaten the safe and efficient production of coal mines. Studying the dynamic mechanical properties of coal-rock materials under complex stress conditions is of great significance to the prediction and prevention of coal-rock dynamic disasters. Based on the Holmquist-Johnson-Cook (HJC) constitutive model of rock, finite element analysis software LS-DYNA was used to simulate the SHPB experiment of coal and rock. Based on the similarity between simulation results and experimental results, SHPB passive confining pressure test numerical simulation. The results show that the elastic modulus, thickness, friction factor and the clearance between the sleeve and the specimen have a significant effect on the dynamic mechanical properties of the coal-rock material. According to the research results, an extra layer can be added to the coal pillar in the project, and the impact resistance of the coal pillar can be enhanced by reasonably designing the parameters such as the elastic modulus, thickness, gap and friction coefficient of the additional layer.