落石作用于钢筋混凝土棚洞的冲击力研究  

Study on Impact Force of Rock-fall onto Rock Shed Tunnel

作　　者：陈驰[1] 刘成清[1] 陈林雅 赵世春[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《公路交通科技》2015年第1期102-109,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51278428);中央高校基本科研业务费资金项目(2682014CX066)

摘　　要：为解决钢筋混凝土棚洞设计中的关键问题之一,即如何计算落石作用于钢筋混凝土棚洞的最大冲击力问题,以冲量定理为基础,推导出了落石最大冲击力的近似计算方法;以实际棚洞结构为原型,利用有限元方法确定近似计算方法中参数的取值,得到了落石作用于钢筋混凝土棚洞的冲击力公式。该公式考虑了落石形状、质量、冲击速度、垫层材料、垫层厚度以及棚洞跨度等主要影响因素,并与试验数据作对比验证了该公式的合理性。研究结果表明:落石形状、质量、冲击速度、垫层材料、垫层厚度对冲击力影响较大,而棚洞跨度对冲击力影响较小;落石形状、质量、垫层材料、垫层厚度对冲击时间影响较大,冲击速度、棚洞跨度对冲击时间影响较小。该结论可为今后钢筋混凝土棚洞在落石冲击作用下的设计提供理论依据。One of key problems of designing RC shed tunnel structure is how to calculate the maximum impact rock-fall force onto the structure. Based on impulse theorem, the approximate calculation method of maximum impact force is derived. By taking real shed tunnel structure as prototype and using the finite element method, the parameter values in the approximate calculation formula is determined, and the impulsive force formula of rock-t＇all onto RC shed tunnel is obtained. The formula considers the main influencing factors such as rock-fall shape, mass, impact velocity, cushion material, cushion thickness, and tunnel span. Then, the calculated values are compared with the test data to verify the rationality of the formula. The result shows that （ 1 ） rock-fall shape, mass, impact velocity, cushion material and thickness have greater influence on impact force, while shed tunnel span has little effect on impact force; （2） rock-fall shape, mass, cushion material and thickness have greater influence on impact duration, while impact velocity, shed tunnel span have little effect on impact force. The conclusion can provide a reasonable theory basis for the design of RC shed tunnel under rock-fall impact.

关 键 词：隧道工程 冲击力 有限元法 钢筋混凝土棚洞 落石 

分 类 号：TU457[建筑科学—岩土工程]