峡谷区公路桥隧衔接段危岩运动模拟及轻量化防护预警体系探讨  

Discussion on Motion Simulation and Lightweight Protection Early Warning System of Dangerous Rock in Connecting Bridge and Tunnel of Highway in Valley Area

作　　者：孙耀明[1] 彭李 廖志鹏 黎鸣明 袁兵[1] 杨斯亮 许浒[3] 周小军[1] SUN Yaoming;PENG Li;LIAO Zhipeng;LI Mingming;YUAN Bing;YANG Silang;XU Hu;ZHOU Xiaojun(China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067;Sichuan OST Slope Protection Engineering Co.,Ltd.,Chengdu 610000;South West Jiaotong University,Chengdu 610000)

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067 [2]四川奥思特边坡防护工程有限公司,成都610000 [3]西南交通大学,成都610000

出　　处：《公路交通技术》2024年第3期98-109,117,共13页Technology of Highway and Transport

基　　金：重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0559)。

摘　　要：深切峡谷区公路桥隧衔接段危岩落石极为普遍,具有高陡、面广量大、致灾随机性强等特点,存在识别难、绕避难、防治难、养护难等诸多工程难题,使得现有防护措施面临巨大挑战。以巫溪隧道出口危岩为例,采用无人机倾斜摄影测量技术建立山体高精度三维模型,快速准确识别危岩及其分布,利用RockFall及CRSP-3D软件模拟落石运动特征。结果表明:1)落石以自由飞落、滚动、弹跳为主;2)无防护工况下落石最大弹跳高度大于70 m,最大冲击能量9000 kJ,主被动防护工况下,仍有10%的高位落石破网而出;3)LS-DYNA模拟显示,冲击作用下柔性棚洞可拦截破网落石,棚洞各构件处于弹性状态,但拱架基础在低能落石冲击下易破坏。基于此,提出深切峡谷区桥隧衔接段突发型及渐进型危岩落石全寿命周期轻量化预警防护体系,以实现“高能易修、中能无害、低能零损”的防护预警目标。Dangerous rock is very common in the highway bridge and tunnel connection section of the deep canyon area,which is high and steep,and characterised by wide surface and large amount,and strong randomness of disaster.It leads to many engineering problems,such as being hard to identify,shelter,treat,maintain and so on,which poses great challenges for the existing protection measures.Taking the dangerous rock at the exit of Wuxi tunnel as an example,the UAV tilt photogrammetry technology is used to establish a high-precision 3D model of the mountain,identify the distribution of dangerous rock and dangerous rock quickly and accurately,and use RockFall and CRSP-3 D.The results show that:1)the rockfall is mainly free flying,rolling and bouncing.2)The maximum jumping height of the boulder is 70 m and the maximum impact energy is 9000 kJ,Under the active and passive protection condition,there are still 10%of the high falling rocks breaking the net.3)LS-DYNA simulation shows that the flexible tunnel can intercept the fall rocks under the action of impact,and the components of flexible tunnel is being in an elastic state,but the arch foundation is easy to be destroyed under low energy.Based on this,sudden and progressive dangerous rock fall life cycle lightweight early warning protection system of deep canyon area bridge connecting section is put forward to realize the protection early warning target of"high energy easy repair,medium energy harmless,low energy zero loss".

关 键 词：深切峡谷区 危岩 运动模拟 柔性棚洞 轻量化防护预警体系 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]