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中文摘要：
钢筋混凝土棚洞结构是西部滚石灾害多发区最为有效的滚石防护结构,一般通过在棚洞顶部铺设一定厚度的砂砾石垫层来达到缓冲吸能的目的。在棚洞结构设计中,确定滚石冲击力大小是关键,而目前国内外尚无合理的计算公式,严重地影响了滚石棚洞结构工程应用。由于滚石冲击能量大,冲击时间短暂,涉及到结构大变形和复杂的能量转换关系,因而滚石冲击荷载下棚洞结构的动力响应研究难度较大。以实际滚石棚洞结构为原型,采用动力有限元对滚石冲击过程进行了数值仿真,研究滚石在不同冲击角度下棚洞结构的动力力学响应,为滚石防护工程设计提供理论基础。
英文摘要：
The rock shed is the most effective protective structures against rock-fall in mountainous areas;generally,a slab covered with sand-gravel cushion in the zone exposed to falling blocks,which acts as a shock absorber.To determine the impact force is key problem in design of rock shed;however,there is no reasonable calculation formula which result in great waste in project and restrict its application.Meanwhile,as large impact energy,short impact time,involving large deformation and complex energy conversion,the study of dynamic response is also difficult to carry out.This paper takes the rock shed as prototype,using the dynamic finite element method to investigate the impact response of rock shed to rock-fall.The results can provide theoretical base for rock shed design.
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