摘要
为探究采用反拉式顶管法施工盾构隧道联络通道过程中主隧道的力学响应机制,依托北京地铁某盾构区间,建立模拟联络通道施工过程的有限元模型,通过与现场监测数据对比验证模型的准确性。继而研究联络通道施工对主隧道管片间错台位移、特殊管片应力及变形、螺栓受力的影响,并分析反力模式对主隧道管片力学特性的影响。结果表明:1)始发管片破除对主隧道力学性能影响较大,随着联络通道进一步开挖,主隧道受力和变形缓慢增大。2)管片间最大错台位移为1.17 mm,发生在特殊管片与普通管片接缝底部。特殊管片最大拉应力为18.6 MPa,出现在开口的顶、底部;最大压应力为27.0 MPa,出现在开口的腰部;最大横向扩张位移和竖向收敛位移分别为2.13 mm和4.56 mm。主隧道管片环间螺栓最大拉应力为213 MPa。3)背推式反力模式更利于控制开口处的横、竖向位移,反拉式反力模式更利于控制开口对面管片应力变形及其接缝处错动位移。
To examine the mechanical response of a metro shield tunnel during the construction of a cross-passage using the front-traction pipe jacking method,a finite element model based on a Beijing metro shield tunnel is established to simulate the construction process.The model′s accuracy is validated by comparing simulation results with field monitoring data.The effects of cross-passage construction on the dislocations between rings,stress and deformation of special segments,and bolt force are studied.Meanwhile,the effect of different reaction modes on the mechanical characteristics of shield tunnel are analyzed.Key findings include the following.(1)Opening a special segment significantly affects the mechanical properties of the shield tunnel;the stress and deformation increase gradually with the excavation of the cross-passage.(2)The maximum displacement between segments is recorded as 1.17 mm,occurring at the bottom of the joint between the special and ordinary segments.The highest tensile stress in the special segment is 18.6 MPa at the top and bottom of the opening,whereas the maximum compressive stress is 27.0 MPa at the waist of the opening.The maximum transverse expansion and vertical convergence displacement of the special segment are 2.13 and 4.56 mm,respectively,with the inter-ring bolt experiencing a maximum tensile stress of 213 MPa.(3)The back-thrust reaction mode proves more effective in controlling the horizontal and vertical displacement at the opening,whereas the front-traction reaction mode better manages the stress and deformation of the segment and the dislocation between rings opposite the opening.
作者
张明聚
康博
李鹏飞
庞跃魁
王锡军
吴昊
ZHANG Mingju;KANG Bo;LI Pengfei;PANG Yuekui;WANG Xijun;WU Hao(Key Laboratory of Urban Security and Disaster Engineering,the Ministry of Education,Beijing University of Technology,Beijing 100124,China;BCEG Civil Engineering Co.,Ltd.,Beijing 100015,China)
出处
《隧道建设（中英文）》
CSCD
北大核心
2024年第6期1165-1173,共9页
Tunnel Construction
基金
北京市自然科学基金(8222004)
国家自然科学基金(52278382,51978019)。
关键词
地铁盾构隧道
联络通道
反拉式顶管法
机械法
力学性能
metro shield tunnel
cross passage
front-traction pipe jacking method
mechanical method
mechanical property
