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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。
Reinforced concrete shed structure is the most effective rolling stone protection structure in western rolling disaster prone area. The purpose of cushioning energy absorption is usually achieved by laying a certain thickness of sand and gravel cushion layer on the top of the shed hole. In the design of shed structure, it is the key to determine the impact force of rolling stone. At present, there is no reasonable formula at home and abroad, which has seriously affected the engineering application of roller shed structure. Due to the large impact energy of rolling stones and the short impact time, it involves the large deformation and complicated energy transformation of the structure. Therefore, it is difficult to study the dynamic response of the shed structure under the impact of rolling stone. Taking the actual structure of roller shed as a prototype, the dynamic finite element method is used to simulate the impact process of the roller stone. The dynamic mechanical response of the rock shelter structure under different impact angles is studied, which provides a theoretical basis for the design of the roller stone protection engineering.