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基于LS-DYNA有限元分析软件的HJC本构模型,对煤柱单轴动载实验进行数值模拟,再现煤柱动态损伤过程。结果表明:应变率相同时,煤柱受动载荷越大,破坏越严重;煤柱开始破裂时所受应力2 MPa,破裂过程中所受应力0.5 MPa;应变率相同时,煤柱的临界破坏能量相同;煤柱的能量吸收及应力变化不与动载荷成正比。
Based on the HJC constitutive model of LS-DYNA finite element analysis software, the uniaxial dynamic experiment of coal pillar is numerically simulated to reproduce the dynamic damage process of coal pillar. The results show that when the strain rate is the same, the bigger the dynamic load of coal pillar is, the more serious the damage is. The stress of the coal pillar at the beginning of rupture is 2 MPa and the stress of the rupture process is 0.5 MPa. At the same strain rate, The same energy; pillar energy absorption and stress changes are not proportional to the dynamic load.