CAJ | 학술논문

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。
매암동력재해엄중위협착매광적안전고효생산，연구매암재료재복잡응력상태하적동태역학성능대매암동력재해적예측예방유중요의의。이용유한원분석연건 LS-DYNA，채용암석적Holmquist-Johnson-Cook (HJC)본구모형，대매암SHPB실험진행수치모의，재모의결과여실험결과상사성교호적기출상，대매암SHPB피동위압실험진행수치모의。결과표명：위압투통적탄성모량、후도、마찰인수급투통여시건적간극대매암재료적동태역학성능유현저영향。근거연구성과，재공정중가위매주증가일외가층，통과합리설계외가층적탄성모량、후도、간극급마찰인수등삼수，증강매주적항충격능력。
Coal or rock dynamical disaster poses grave threats to the coal mine safety and high effi-ciency production. So, research on dynamic properties of coal under the complex stress state is signifi-cant. By using the software LS-DYNA, theΦ50 mm split Hopkinson pressure bar(SHPB) tests for coal have been numerically simulated by using the Holmquist-Johnson-Cook (HJC) constitutive model. Based on the finding that the numerical simulation results were similar to the experimental results, pas-sive confined pressure SHPB of coal has been simulated. It is demonstrated that elasticity modulus of sleeve, thickness of sleeve, friction coefficient of contact surface, interval between sleeve and specimen significantly have significant impact on dynamic properties of coal. According to the research results, a new layer to the coal pillar can be added. It can improve shock resistance of coal pillar by designing op-timal parameters of additional layer:elasticity modulus, thickness, friction coefficient of contact surface interval.