中文摘要：

采用以橡胶为原料的废弃轮胎作为垫层材料,利用有限元软件建立落石冲击棚洞结构模型,研究落石冲击速度、橡胶缓冲垫层厚度对棚洞结构最大等效应力、结构动能、节点位移等的影响。结果表明：在竖向落石冲击作用下,棚洞结构中间跨的横梁端部为受力不利位置;落石的冲击速度越高、橡胶缓冲垫层越厚,橡胶垫层的缓冲作用越显著;在冲击荷载作用下,棚洞结构横梁下部会承受较大的拉应力,应加强横梁底部的钢筋布置。

英文摘要：

Some waste tire was made of rubber,which could be used as cushion material.A model of rockfall impact tunnel shed was established by finite element software to analysis the effects of rockfall impact velocity,the thickness of the cushion on the maximum equivalent stress,kinetic energy,the displacements of some nodes of tunnel shed.The results show that under the vertical impact of rockfall,the end of beam in the middle span of tunnel shed is a disadvantageous position.The impact velocity of rockfall is higher,the thickness of cushion is thicker,the cushion effect is more significant.Under the impact load,the lower part of the tunnel shed will bear larger tensile stress,and the reinforcement at the bottom of the beam should be strengthened.