落石冲击作用下环形网耗能性能的理论及数值模拟研究

Numerical and theoretical analysis of dissipation energy capacity of ring net impacted by rockfall

推导了环形网中单个圆环耗散能量的计算公式,建立两种不同约束条件下环形网受落石冲击的计算模型,讨论了环形网耗能的计算方法。采用LS-DYNA软件对两种模型下环形网受到落石冲击作用的力学性能进行了数值模拟分析,对比分析了两种模型对环形网耗能性能的影响,同时对模型2中影响环形网耗能性能的因素进行了参数分析,并与理论计算结果进行了比较,理论计算结果能较好地预测环形网吸收的最大能量,可为环形网耗能性能的评价及应用提供一定的参考依据。

The formula to consider the dissipation energy capacity of single ring was deduced,two models of the ring net with different restraint impacted by rockfall were established and the dissipation energy capacity of the ring net in two models was discussed.Based on the LS-DANY program,the mechanical performance of the ring net in the two models impacted by rockfall was investigated,and the result of model one was validated by the experiment.The parameters which influence the dissipation energy capacity of the ring net in the model two were analyzed,and the result was compared with the theoretical one.The research shows that the theoretical computation can well evaluate the dissipation energy capacity of the ring net.The way to evaluate the dissipation energy capacity of the ring net was also presented.