隧道洞口挡土墙稳定性及其加固技术研究  

Research on Stability and Reinforcement Technology of Retaining Wall at Tunnel Portal

作　　者：闫明超 YAN Mingchao(China Railway No.5 Engineering Group Co.,Ltd.,Changsha 410000,Hunan,China)

机构地区：[1]中铁五局集团有限公司,湖南长沙410000

出　　处：《工程技术研究》2023年第5期86-89,共4页Engineering and Technological Research

摘　　要：为研究隧道洞口挡土墙的稳定性,并制订合理的挡土墙加固防护方案,文章以某隧道为工程背景,在隧道洞口挡土墙中布置监测点,观测洞口挡土墙的位移及沉降;并通过分析挡土墙失稳的原因,制订采用钢花管注浆加固、钢筋网片、喷射混凝土等措施加固挡土墙的技术方案,且在加固后的洞口挡土墙中布置18个监测点,观测加固后挡土墙的位移及沉降。通过与加固前的监测结果对比发现,加固后洞口挡土墙最危险处的位移量减小了86%,沉降量减小了64%,挡土墙的位移和沉降得到了有效控制,结果可为今后类似挡土墙加固防护施工提供理论参考。In order to study the stability of the retaining wall at the tunnel portal and formulate a reasonable reinforcement and protection scheme for the retaining wall,this paper takes a tunnel as the engineering background,and arranges monitoring points in the retaining wall at the tunnel portal to observe the displacement and settlement of the retaining wall at the tunnel portal.By analyzing the causes of the instability of the retaining wall,the technical scheme of reinforcing the retaining wall by means of steel flower tube grouting reinforcement,steel mesh,shotcrete and other measures is formulated,and 18 monitoring points are arranged in the reinforced retaining wall at the portal to observe the displacement and settlement of the reinforced retaining wall.Compared with the monitoring results before reinforcement,it is found that the displacement of the most dangerous part of the retaining wall at the portal after reinforcement is reduced by 86%,and the settlement is reduced by 64%.The displacement and settlement of the retaining wall are effectively controlled.The results can provide a theoretical reference for similar retaining wall reinforcement and protection construction in the future.

关 键 词：隧道洞口 挡土墙 失稳监测 注浆加固 位移监测 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]