中国铁道科学2018，Vol.39Issue(1)：8-15,8.DOI:10.3969/j.issn.1001-4632.2018.01.02
落石碰撞切向恢复系数的取值研究
Research on Value of Tangential Restitution Coefficient for Rockfall Collision
摘要
Abstract
The value of tangential restitution coefficient is the key parameter for calculating rockfall trajectories and designing passive protection systems.The tangential restitution coefficients were studied through rockfall collision tests under different conditions of slope,the shape and mass of rockfall.Results show that the tangential restitution coefficient is basically not affected by the shape of rockfall,and is obviously influenced by rockfall mass,slope conditions,gradient and falling height.The tangential restitution coefficient increases gradually as the slope changes from soft to hard or as the rockfall mass increases,and it decreases gradually with the increase of slope gradient or falling height.Most of the tangential restitution coefficients under various test conditions are above 0.4,which accounts for 98％ of the total number of tests.The coefficients above 0.5 account for 93％ of the total and those above 0.9 account for 25％,which indicates that the loss of tangential velocity is limited in the collision process.In the current simulation of rockfall movement path,the value of the existing tangential restitution coefficient is too small in some cases,which may lead to the lack of safety reserve in passive protection design.The suggested values for tangential restitution coefficients under various conditions are proposed by comprehensively considering slope state and gradient.It is suggested that higher value should be adopted when the slope is harder and the gradient is smaller.Otherwise,smaller value in the interval is taken or the interval random value is used directly.关键词
落石/运动路径/被动防护设计/切向恢复系数/模型试验Key words
Rockfall: Trajectory/Passive protection design/Tangential restitution coefficient/Model test分类
交通工程引用本文复制引用
叶四桥,巩尚卿,王林峰,谢涛,王宗建..落石碰撞切向恢复系数的取值研究[J].中国铁道科学,2018,39(1):8-15,8.基金项目
国家自然科学基金资助项目(51108488,51408084,51679018) （51108488,51408084,51679018）
国家重点研发计划重点专项子课题(2016YFC0802206-3) （2016YFC0802206-3）
重庆市高校青年骨干教师资助计划(渝教人[2011] 65号) （渝教人[2011] 65号）
重庆市高校创新团队建设计划资助项目(KJTD201305) （KJTD201305）
