摘要
为研究小曲率半径盾构隧道盾构管片结构破损机理,基于实际工程案例,建立考虑纵缝接头以及环间接头的精细化衬砌管片模型,揭示小曲率半径盾构隧道施工阶段的管片破损机理。结果表明:小曲率半径盾构隧道在转弯段施工时,管片轴力、剪力、正弯矩和米塞斯(Mises)应力均在内外侧拱腰处取得峰值;拱腰位置管片在掘进过程中更容易发生破损;千斤顶推力纠偏角度增加时,隧道整体向外侧偏移;盾构隧道腰部外侧受到的影响更为明显,外侧拱腰的偏移量显著大于内侧拱腰。数值模拟和现场观测到的管片破损状况一致,可为实际工程提供借鉴。
In order to study the damage mechanism of shield segment structure of shield tunnel with small curvature radius,based on practical engineering cases,a fine lining segment model considering segment joints and inter-ring joints was established to reveal the segment damage mechanism in the construction stage of shield tunnels with small curvature radius.The results showed that the axial force,shear force,positive bending moment and Mises stress of the segment all peaked at the inner and outer arch waists when the shield tunnel with small curvature radius was constructed in the turning section.The arch waist position of segments were more likely to be damaged during the excavation process.When the rectification angle of the jack thrust increased,the overall tunnel deviated to the outside.The outer side of the shield tunnel waist was more obviously affected,since the offset of outer arch waist was significantly larger than that of inner arch waist.The numerical simulation was consistent with the field observation of segment damage,which could provide reference for practical engineering.
作者
王智
刘祥勇
朱先发
洪小星
沈一鸣
张冰利
WANG Zhi;LIU Xiangyong;ZHU Xianfa;HONG Xiaoxing;SHEN Yiming;ZHANG Bingli(Nantong Urban Rail Transit Co.,Ltd.,Nantong 226007,Jiangsu,China;Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《隧道与地下工程灾害防治》
2023年第1期45-54,共10页
Hazard Control in Tunnelling and Underground Engineering
关键词
小曲率半径
盾构隧道
管片破损
转弯段施工
small curvature radius
shield tunnel
segment breakage
construction of turning section
