公路隧道出洞安全施工方法研究  

Research on Safe Construction Method for Highway Tunnel Exit

作　　者：吕前前 LV Qianqian(Ningyang County Transportation Bureau,Tai′an 271400,Shandong,China)

机构地区：[1]宁阳县交通运输局,山东泰安271400

出　　处：《工程与试验》2025年第1期107-109,共3页Engineering and Test

摘　　要：本文以山东省某公路隧道为研究案例,分析了隧道小导洞出洞施工的技术措施。使用有限元软件计算了洞口处的围岩稳定性,并对出洞部位的围岩进行了监测和隧道全息断面扫描。研究结果表明,隧道最大环向应力通常出现在隧道小导洞下部的位置,最大剪应力为6.17MPa,而水平位移最大值则出现在拱腰位置。上台阶小导洞处的初支分布有较大应力,最大正应力为7.97MPa。围岩变形更为显著边墙处的变形明显高于拱顶处的变形,边墙处最大变形为318mm,拱顶最大变形为239mm。小导洞附近的边墙超挖现象较为明显,超挖量在11.4cm~17.5cm范围内,在施工过程中需加强小导洞位置出洞爆破控制,保证隧道的安全出洞。Taking a highway tunnel in Shandong Province as a research case,the technical measures for the construction of small pilot tunnels are analyzed in the paper.The finite element software is used to calculate the stability of the surrounding rock at the entrance of the tunnel,and the surrounding rock at the exit of the tunnel is monitored and the tunnel holographic cross-section is scanned.The research results indicate that the maximum circumferential stress of the tunnel usually occurs at the lower part of the small pilot tunnel,with a maximum shear stress of 6.17MPa,while the maximum horizontal displacement occurs at the arch waist position.The initial support at the small pilot tunnel of the upper step has a large stress,with a maximum normal stress of 7.97MPa.The deformation of the surrounding rock is more significant.The deformation at the side wall is significantly higher than that at the vault,with a maximum deformation of 318mm at the side wall and 239mm at the vault.The over-excavation of the side wall near the small pilot tunnel is quite obvious,with an over-excavation amount within the range of 11.4cm~17.5cm.In the construction process,it is necessary to strengthen the blasting control at the small pilot tunnel position to ensure the safe excavation of the tunnel.

关 键 词：公路隧道 隧道出洞 安全施工 沉降观测 隧道洞口 

分 类 号：U456[建筑科学—桥梁与隧道工程]