摘要
针对艰险山区隧道洞口落石防护的迫切需要,提出了一种分流式引导系统。开展了2组不同条件下的原位足尺冲击试验,通过高速影像采集与运动分析平台等进行了试验数据采集,并分析了分流式引导系统的分导性能。基于LS-DYNA软件,建立了分流式引导系统的非线性动力模型,反演分析了足尺试验,研究了落石分导效果及系统的耗能特征,并开展了落石群冲击下分流式引导系统分流能力的参数分析,研究参数包括横向倾角和纵向倾角。结果表明:系统工作可分为拦截和分流两个阶段,在两个阶段均形成了冲击力峰值,分流阶段冲击力峰值为拦截阶段冲击力峰值的64%;减压环耗能约占系统总耗能的50%;系统跨间横向支撑绳初始处于松弛状态下,试块离开系统时横向偏移距离达到了5.75 m,试块动能仅为初始冲击能量的15%,分流耗能效果明显;横向倾角在40°~45°区间,纵向倾角在20°左右时,系统能获得较好的分流效果。
Here,aiming at urgent requirements for rock fall protection at tunnel entrances in difficult and dangerous mountainous areas,a diversion guidance system was proposed.Two sets of in-situ full-scale impact tests were conducted under different conditions,and test data were collected through high-speed image acquisition and motion analysis platforms.The diversion performance of the diversion guidance system was analyzed.Based on the software LS-DYNA,the nonlinear dynamic model of the diversion guidance system was established,and full-scale tests were inverted and analyzed to study rockfall diversion effect and energy dissipation characteristics of the system.The parametric analysis for the diversion ability of the diversion guidance system under impacts of rockfall groups was performed,the studied parameters included lateral and longitudinal inclination angles.The results showed that the system operation can be divided into two stages of interception and diversion,in these two stages,two peak impact forces are formed,the peak impact force in the diversion stage is 64%of that in the interception stage;energy consumption of brake ring occupies approximately 50%of the total energy consumption of the system;transverse support ropes at system inter-span are initially in a relaxed state,lateral drift distance of test block during it leaving the system reaches 5.75 m,kinetic energy of test block is only 15%of the initial impact energy to indicate an obvious diversion energy dissipation effect;when lateral inclination angle is within the range of 40°-45°and longitudinal inclination angle is around 20°,the system can achieve better diversion effect.
作者
齐欣
邓芊芊
赵雷
袁松
李贞良
王希宝
余志祥
QI Xin;DENG Qianqian;ZHAO Lei;YUAN Song;LI Zhenliang;WANG Xibao;YU Zhixiang(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Sichuan Communication Surveying and Design Institute Co.,Ltd.,Chengdu 610017,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2023年第17期9-16,共8页
Journal of Vibration and Shock
基金
四川省科技计划项目重点研发项目(2022YFG0141)
四川省交通科技项目(2020-B-01)
2020年交通行业重点科技项目(2020-MS3-101)
关键词
分流式引导系统
足尺试验
有限元模型
分导效果
diversion guidance system
full-scale test
finite element model
diversion effect
