浅埋偏压隧道管棚注浆加固效应分析  

Analysis of Grouting Reinforcement Effect of Pipe Shed in Shallow-buried Bias Tunnel

作　　者：王恒 Wang Heng(China Railway 7th Bureau Group 3rd Engineering Co.,Ltd.,Xi’an 710016,China)

机构地区：[1]中铁七局集团第三工程有限公司,西安市710016

出　　处：《北方交通》2024年第8期83-87,共5页Northern Communications

摘　　要：依托杭州地铁三号线小和山暗挖隧道工程,建立隧道开挖三维有限元计算模型,研究边坡偏压条件下,松散地层浅埋隧道开挖过程中管棚的加固效应。结果表明:受边坡偏压影响,隧道拱顶及两侧拱肩附近存在塑性区,该区域最易失稳。管棚注浆可有效抑制围岩变形,减小拱顶沉降。管棚最大沉降与加固区弹性模量和注浆半径之间存在负相关关系,特别是与注浆半径近似呈线性负相关。研究认为,增大加固区弹性模量及扩大注浆半径均有利于减小管棚沉降,提高隧道开挖稳定性。Relying on the Xiaoheshan underground excavation tunnel project of Hangzhou metro line 3,the three-dimensional finite element calculation model of tunnel excavation is established,so as to study the reinforcement effect of pipe shed during the excavation of shallow-buried tunnels in loose strata under the condition of slope bias.The results show that:there is a plastic zone near the tunnel vault and the spandrel on both sides due to the influence of slope bias,and this zone is the most prone to instability.The pipe shed grouting can effectively inhibit the deformation of the surrounding rock and reduce the settlement of the vault.There is a negative correlationship between the maximum settlement of the pipe shed and the elastic modulus and grouting radius of the reinforcement area,especially the linear negative correlation with the grouting radius.The research shows that,increasing the elastic modulus of the reinforcement area and expanding the grouting radius are conducive to reducing the settlement of the pipe shed and improving the stability of tunnel excavation.

关 键 词：浅埋暗挖 边坡偏压 管棚注浆 加固效应 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]