摘要
针对现有落石冲击力算法计算所得结果严重偏小的问题,提出应考虑落石冲击过程中落石重量和反弹效应对落石冲击力的影响,并基于冲量定理和在日本道路公团算法以及有关试验数据的基础上研究新的落石冲击力计算方法。通过法向恢复系数引入落石反弹效应计算项,通过定义落石冲击力放大系数建立落石最大冲击力和平均冲击力之间的联系,从而导出适用于不同冲击速度、不同缓冲土层厚度和不同冲击角度的落石最大冲击力算法,并给出对应于工程中常见落石尺寸和冲击速度的冲击力放大系数取值曲线。通过实例验证了利用该算法和冲击力放大系数取值曲线可解决工程中有关落石冲击力的计算问题。
The current methods for calculating the impact force of the rockfall have the problem that the obtained results are seriously smaller than the true values.It is suggested that the influence of the rockfall weight and the rebound effect on the impact force of the rockfall should be taken into account during the process of rockfall impact.A new method for calculating the impact force of the rockfall was researched based on the impulse theorem,the algorithm proposed by Japanese Road Association,and the relevant test data.The computational item for the rebound effect of the rockfall was introduced by the normal recovery coefficient.The relation between the maximum impact force and the average impact force of the rockfall was established by defining the magnification coefficient of the rockfall impact force.Accordingly,the algorithm was derived for calculating the maximum rockfall impact force,which was applicable to different impact speed,different thickness of the buffer layer and different impact angle.And the magnification coefficient curve of the impact force corresponding to the common rockfall size and impact speed in engineering was provided.Examples have validated that the proposed algorithm and the magnification coefficient curve of the impact force can solve the problems in the calculation of the rockfall impact force in engineering.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2010年第6期56-62,共7页
China Railway Science
基金
国家自然科学基金资助项目(50678182)
重庆市教委科技项目(KJ080412)
重庆交通大学青年科学基金资助项目(2006-016)
关键词
落石
冲击力
计算方法
隧道安全
Rockfall
Impact force
Calculation method
Tunnel safety
