池黄高速铁路隧道高陡边坡危岩落石防护方案研究  

Study on Protection Scheme of Dangerous Rock Falling on High Steep Slope of Chizhou-Huangshan High Speed Railway Tunnel

作　　者：杨川 YANG Chuan(Anhui-Jiangxi Railway Anhui Co.Ltd.,Hefei 230001,China)

机构地区：[1]皖赣铁路安徽有限责任公司,合肥230001

出　　处：《铁道建筑》2023年第5期124-126,共3页Railway Engineering

摘　　要：池黄高速铁路(池州—黄山)磨盘尖1号隧道进口边坡存在孤石,岩体节理裂隙发育,存在落石隐患。利用有限元软件对体积为0.5、1.0、1.5 m^(3)的落石运动轨迹进行模拟,确定了落石的冲击能量、弹跳高度、冲击速度及落点范围。结合主、被动防护方式的特点,提出四道落石防护方案,即洞口上部难以清除危石进行主动加固、洞门右侧落石采用张口式引导网、隧道仰坡增设拦石墙+被动防护网、隧道进口增设棚洞接长。对钢筋混凝土棚洞和柔性棚洞两种棚洞接长方案进行比选,钢筋混凝土棚洞方案较优。经数值模拟验算,钢筋混凝土棚洞下部三柱式门式墩和双柱式门式墩盖梁部位各项受力均满足规范要求。There are isolated rocks on the entrance slope of the Mopanjian No.1 Tunnel of the Chizhou-Huangshan High Speed Railway,and the development of joints and fractures in the rock mass poses a potential risk of rockfall.Rockfall trajectories with volumes of 0.5,1.0 and 1.5 m^(3) were simulated using finite element software.The impact energy,rebound height,impact velocity and range of impact points of the rockfall were determined.Based on the characteristics of active and passive protection methods,four rockfall protection schemes are proposed,namely,actively reinforce the dangerous rocks that are difficult to remove from the upper part of the tunnel entrance,using opening type guidance network for rockfall on the right side of the tunnel entrance,adding a stone blocking wall and passive protection network on the front slope of the tunnel,and adding a shed tunnel extension at the tunnel entrance.Comparing and selecting two types of shed tunnel extension schemes,reinforced concrete shed tunnel and flexible shed tunnel,the reinforced concrete shed tunnel scheme is more optimal.After numerical simulation verification,it was found that all stress on the parts of three-column portal pier and double-column portal pier cover beam at the lower part of the reinforced concrete shed tunnel meets the requirements of the specifications.

关 键 词：铁道隧道 危岩落石防护 数值模拟 运动轨迹 高陡边坡 棚洞防护 

分 类 号：U459.1[建筑科学—桥梁与隧道工程] U213.13[交通运输工程—道路与铁道工程]