框架型棚洞承受落石冲击力的模型试验研究  

Experimental Study on Impact Force of Rockfall Applied to Frame Shed Tunnel

作　　者：罗福君[1] 周晓军[1] 刘建国[1] 汪精河[1] 姜波[2] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [2]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《公路交通科技》2017年第3期94-100,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51378436);铁道部科技研究开发计划项目(2010G018-C-1-3)

摘　　要：针对框架型棚洞在不同种类缓冲垫层防护下抵抗落石冲击力的力学性能,通过大比例尺室内模型试验进行了测试研究。分析了在不同种类缓冲垫层和不同冲击能量下落石冲击力的变化规律;依据试验数据和理论推导给出了反应落石平均冲击力与最大冲击力之间关系的扩大系数,改进了框架型棚洞在不同类型缓冲垫层防护下落石冲击力的计算方法。研究结果表明:改进的落石冲击力计算方法能够综合考虑影响落石冲击力大小的诸多因素;对于特定的落石冲击能量,不同类型的垫层属性所反应的落石冲击力大小实质是受到垫层属性函数f^(h,E,μ,γ)的影响,具体表现为f值越大,不同垫层种类下的冲击力扩大系数的离散性越小,反之越大。Large scale indoor model experiment is performed to test the frame shed tunnel under the protection of different kinds of cushion embedded on tunnel roof slabs against impact force of rockfall.The changing rule of impact force induced by rockfall is analyzed according to different impact energies and different types of cushions.An enlargement coefficient reflecting the relationship between average impact force and maximum impact force is derived using experimental data and theoretical analysis,the calculation method of frame shed tunnel against impact force of rockfall under different kinds of cushion is improved.The result shows that（1） improved rockfall impact force calculation method can consider many factors that affect the rockfall impact force;（2） for the particular rockfall impact energy,the rockfall impact forces with different types of cushion properties are affected by the cushion property function f-（h,E,μ,γ）,showing that the greater the value of f,the smaller the discreteness of impact force expansion coefficient with different kinds of cushion,and vice versa.

关 键 词：隧道工程 框架型棚洞 模型试验 落石冲击力 缓冲垫层 

分 类 号：TU443[建筑科学—岩土工程]