拱形棚洞受落石冲击的模型试验研究

摘要

Model test was used to study the impact resistance of an arch shaped shed tunnel,which mainly analyzed the dynamic response rules of the arch,the upright column and the interior steel under diverse impact energy,cushion with diverse thickness,diverse impact locations.The rules of rockfall impact force and displacement of the arch shaped shed tunnel under diverse impacting condition were analyzed;Failure modes and weak area of the arch shaped shed tunnel were analyzed.The relative strengthening measures and appropriate thickness range of light soil cushion were given.%通过室内模型试验对拱形棚洞抵抗落石冲击的力学性能进行了研究.重点分析了棚洞的拱圈、立柱和其内部钢筋在不同落石冲击能量、不同缓冲垫层厚度、不同冲击位置下的动力响应;分析了不同冲击工况下落石冲击力、拱形棚洞位移的变化规律;研究了拱形棚洞受落石冲击的破坏形态及其薄弱区域;并给出了相关加强措施和轻质土缓冲垫层的适宜厚度建议值.