摘要
为深入探究小半径曲线盾构隧道开挖对地表沉降和管片结构变形的影响,采用ABAQUS有限元工具对曲线盾构隧道开挖过程进行了全面细致的模拟,分析了不同曲线半径和千斤顶推力比下盾构隧道施工过程中地表和管片结构的变形规律。研究结果表明:小半径曲线隧道施工较直线隧道地表沉降和管片结构变形明显增大;小半径曲线段盾构隧道横向地表沉降槽呈非对称分布,沉降槽向曲线内侧偏移,曲线半径越小,沉降、偏移越大;管片结构拱顶与拱底的水平变形受曲线半径影响不大,拱腰处受曲线半径影响较大。为控制地表不均匀沉降,建议小半径盾构隧道施工千斤顶内外侧推力比要尽可能控制在1∶1~1∶2;随着内外侧推力比的增大,拱腰外侧水平变形最大增长大于拱腰内侧。在设计和施工过程中,需特别关注曲线段管片的支护和结构设计,以减小变形差异对隧道安全和稳定性的影响。
To investigate the effects of small-radius curved shield tunneling on ground settlement and segmenttal lining deformation,a comprehensive numerical simulation of the excavation process was carried out using ABAQUS. The study examined various curve radii and jack trust ratios to analyze the deformation patterns of the ground surface and tunnel lining. The results indicate that, compared with straight tunnel drives, small-radius curved tunnels experience significantly larger with ground settlement and segmental deformation. The transverse settlement trough in the curved section is asymmetrically distributed and shifts inward toward the curve's center;the smaller the curve radius, the greater both the settlement and the lateral offset. Meanwhile,the horizontal deformation of the vault and arch bottom is relatively insensitive to changes in curve radius, whereas the arch waist is significantly affected. To control uneven ground settlement, it is recommended that the thrust ratio between the inner and outer jacks be maintained between 1∶1 and 1∶2. As the outer-inner thrust ratio increases, the maximum horizontal deformation at the outer arch waist grows more than that at the inner side. Accordingly, special attention should be paid to the support and structural design of segmental linings in curved sections to minimize the adverse impact of differential deformation on tunnel safety and stability..
作者
邹兴
ZOU Xing(China Railway 18th Bureau Group Third Engineering Co.,Ltd.,Zhuozhou 072750,China)
出处
《国防交通工程与技术》
2025年第1期9-13,85,共6页
Traffic Engineering and Technology for National Defence
关键词
盾构隧道
曲线半径
千斤顶推力比
数值模拟
地表沉降
管片变形
shield tunnel
curve radius
jack thrust ratio
numerical simulation
surface settlement
segment deformation
