落石冲击力理论与数值模拟研究

Research on the Theory and Numerical Simulation of Rockfall Impact Force

摘要: 落石冲击力是棚洞结构设计时需要考虑的主要荷载之一。运用LS-DYNA数值模拟二十六面体落石冲击混凝土棚洞结构，并将数值结果与现有的落石冲击力理论计算方法的结果对比分析，结果表明：国内推荐使用的落石冲击力计算方法严重偏小，日本公式计算结果最大。各个理论计算方法的结果相差巨大，为保证棚洞结构的偏安全设计，建议使用日本公式计算落石冲击力。

Abstract: The impact force of falling rock is one of the main loads to be considered in the design of tunnel structure. ANSYS/LS-DYNA numerical simulation was used to simulate the structure of concrete shed and cave impacted by falling rock. The numerical results were compared with the results of the existing theoretical calculation methods of rockfall impact. The results show that the recom-mended method for calculating rockfall impact force in China is seriously small, and the Japanese formula gives the largest result. The results of various theoretical calculation methods vary greatly. In order to ensure the partial safety design of the shed and cave structure, it is suggested to use the Japanese method to calculate the rockfall impact force.