摘要
在边坡工程领域,特别是在具有高陡危岩体的边坡工程中,落石防护已成为该领域的主要研究课题之一,被动柔性防护网因其优越的性能被广泛应用。以渝怀线K158白马一号隧道进口仰坡为研究对象,评估该地区危岩失稳条件下,当前布设的被动防护体系的服役性能。利用摄影测量的方法快速构建出精确的边坡起伏形态及数值模型,基于概率统计、能量损失、碰撞回弹等理论,利用Rocfall模拟落石运动过程。最终根据各级防护网的防护效果,评估当前被动防护体系的服役性能。结果显示,(1)无防护网情况下,1#落石区的落石有13.3%的可能会对铁路桥面造成破坏;(2)当前被动防护体系对于质量小于3 000 kg的1#落石区落石防护效果良好;(3)当前被动防护体系中五级防护网未起到拦截或防护落石作用;(4)当前被动防护体系中,四级防护网主要起消能作用,二级与三级防护网主要起拦截作用。研究成果可以为其他落石防护案例的设计和防护性能分析提供参考。
In the field of slope engineering,especially in the slope engineering with high and steep dangerous rock mass,rockfall has become one of the main research topics in this field. At present,passive flexible protective net is widely used because of its superior performance. Taking the entrance slope of K158 Baima No.1 Tunnel on Chongqing-Huaihua railway as the research object,the service performance of the current passive protection system is evaluated under the assumption of rockfall in this area. Based on the theory of probability statistics,energy loss and collision rebound,the two-dimensional rockfall trajectory simulation software RocFall is used to simulate.Finally,according to the protection effect of all levels of protective nets,the service performance of passive protective nets is evaluated. The results show that:(1) in the case of no protective net,13.3% of the block in the #1 rockfall area may cause damage to the railway;(2) the current passive protection system has good protection effect for the #1 rockfall area with the mass less than 3 000 kg;(3) the fifth level protective net has no effect.(4) In the current passive protection system,the fourth level protection net mainly plays the role of energy dissipation,and the second and third level protection nets mainly play the role of interception. The research results can provide reference for the design and performance analysis of other rockfall protection.
作者
张治平
夏志雄
金昶睿
赵炼恒
ZHANG Zhiping;XIA Zhixiong;JIN Changrui;ZHAO Lianheng(China Academy of Railway Sciences(Shenzhen)Research and Design Institute Co.Ltd.,Shenzhen 518054,China;School of Civil Engineering,Central South University y Changsha,Hunan 410015,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2021年第S02期3274-3283,共10页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51878668)
中国铁道科学研究院集团有限公司基金项目(2020YJ030)
关键词
边坡工程
危岩体
摄影测量
落石模拟
被动防护网评估
slope engineering
dangerous rock mass
photogrammetry
rockfall simulation
evaluation of passive protection net
