落石碰撞恢复系数的现场试验与数值计算  

FIELD TEST AND NUMERICAL CALCULATION OF RESTITUTION COEFFICIENT OF ROCKFALL COLLISION

作　　者：章广成[1,2] 向欣[3] 唐辉明[1] 

机构地区：[1]中国地质大学工程学院,湖北武汉430074 [2]中国地质大学教育部长江三峡库区地质灾害研究中心,湖北武汉430074 [3]中国长江三峡集团公司,湖北宜昌443002

出　　处：《岩石力学与工程学报》2011年第6期1266-1273,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展规划(973)项目(2011CB710606);中央高校基本科研业务费专项基金优秀青年教师特色学科团队资助项目(CUG090104)

摘　　要：为研究落石碰撞恢复系数的特征及影响因素,开展野外落石碰撞试验,利用FASTCAM SA1.1高速摄像系统及配套软件Motion Plus解析获得落石碰撞前、后的速度,并求得法向和切向碰撞恢复系数。进而利用ANSYS/LS-DYNA软件对部分试验进行仿真分析,数值模拟结果与试验结果吻合较好。研究表明:(1)地面岩土体从基岩、碎屑堆积层至松散碎石土,法向碰撞恢复系数逐渐减小,切向碰撞恢复系数则逐渐增加;(2)法向碰撞恢复系数几乎不受落石边长、入射速度和入射角影响,仅与地面岩土体物理力学性质有关;(3)切向碰撞恢复系数不受落石边长的影响,但随入射速度的增加而递增,随入射角的增加而递减。For studying the characteristics and influence factors of restitution coefficient of rockfall collision,the field tests are carried out.By using the FASTCAM SA1.1 high-speed camera and the Motion Plus software,the velocities of rockfall before and after impact are obtained;and the normal restitution coefficient and tangential restitution coefficient are calculated.Meanwhile,the ANSYS/LS-DYNA software is adopted to simulate the test process;and the simulation results and test results are anastomotic well.The results show that：（1） While the ground material changes from fragment,accumulation layer to loose gravelly soil,the corresponding normal restitution coefficient decreases gradually;but the tangential restitution coefficient increases gradually.（2） The normal restitution coefficient is almost independent of the side length of rock block,incidence velocity and incidence angle;and it just affected by the physico-mechanical properties of ground material.（3） The tangential restitution coefficient is independent of the side length of rock block,but it increases with the incidence velocity and decreases with the incidence angle increase.

关 键 词：岩石力学 碰撞恢复系数 高速摄像机 ANSYS/LS-DYNA 屈服应力 切线模量 

分 类 号：TU45[建筑科学—岩土工程]