摘要
以杭州地铁8号线盾构隧道某区间衬砌结构为工程实例,运用扩展有限元方法分析裂缝长度对盾构隧道结构应力与变形的影响。计算结果表明:地表最大沉降出现于盾构隧道开挖的轴线处,其值随地表离隧道轴线的水平距离增大而减小、随衬砌裂缝长度增大而增大;隧道衬砌内环顶部的环向位移随裂缝长度增大而减小,外环顶部的环向位移随裂缝长度增大而增大;衬砌内环拱底和拱腰处的环向应力随衬砌裂缝长度增大而增大,衬砌外环拱底和拱腰处的环向应力随衬砌裂缝长度增大而减小。该研究可为类似工程项目提供参考。
This paper takes the lining structure of a section of the shield tunnel of Hangzhou Metro Line 8 as an example to analyze the impact of crack length on the stress and deformation of the structure of shield tunnels using the extended finite element method.The calculation result shows that:The maximum surface settlement occurs at the excavation axis of shield tunnel.The surface settlement decreases with the increase of the horizontal distance between the surface and the tunnel axis,and the maximum surface settlement increases with the increase of lining crack length;The circumferential displacement at the top of the inner ring of tunnel lining decreases with the increase of crack length,and that at the top of the outer ring increases with the increase of crack length;The circumferential stress at the inner ring arch bottom and arch waist of the lining increases with the increase of lining crack length,and that at the outer ring arch bottom and arch waist of the lining decreases with the increase of lining crack length.This study provides references for similar projects.
作者
付相宇
马列
王梦福
FU Xiangyu;MA Lie;WANG Mengfu(China Railway Construction Bridge Engineering Bureau Group Co.,Ltd.,Tianjin 300300,China)
出处
《中国铁路》
2022年第12期17-22,共6页
China Railway
关键词
隧道
盾构
裂缝长度
衬砌
变形
数值模拟
tunnel
shield
crack length
lining
deformation
numerical simulation
