曲线盾构隧道顶进过程地表沉降数值分析  

Numerical Analysis on Surface Subsidence during Tunnelling Process of Curved Shield Tunnel

作　　者：李燚 LI Yi(China Railway SIYUAN Survey and Design Group Co.,Ltd Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司城地院,武汉430063

出　　处：《铁道勘测与设计》2023年第4期86-89,共4页Railway Survey and Design

摘　　要：为了探究小半径曲线盾构隧道顶进过程地表沉降的规律,对隧道结构施工过程进行数值分析,通过有限元软件分别建立直线和曲线隧道模型分析不同地层条件隧道地表沉降。研究结果显示,直线和曲线隧道在顶进力作用下地表沉降的规律不同,直线段沉降差值大致关于隧道轴线对称,而曲线段外侧有向上隆起趋势,内侧有向下沉陷趋势。研究结果对于今后小半径曲线的研究和施工有指导意义。In order to explore the law of surface subsidence during tunnelling process of small radius curved shield tunnel,numerical analysis is carried out for the tunnelling process of shield tunnel.The numerical analysis models of straight and curved shield tunnel are established to analyze the surface subsidence of tunnels under different stratum conditions The results show that:the rules of surface subsidence of straight and curved tunnels are different during tunnelling process.The difference of subsidence of straight section is approximately symmetrical about the tunnel axis,while the outer side of curved section has upward uplift trend and the inner side has downward subsidence trend.The research results are instructive for the research and construction of small radius curved shield tunnel in the future.

关 键 词：小半径曲线隧道 盾构顶进 地层沉降 数值分析 

分 类 号：U45[建筑科学—桥梁与隧道工程]