泥质粉砂岩地层盾构隧道管片上浮影响因素
夏明1张慧鹏1张志强2曾云嵘1徐腾飞1
Influencing Factors of Shield Tunnel Segment Floating in Muddy Siltstone Stratum
XIA Ming1ZHANG Huipeng1ZHANG Zhiqiang2ZENG Yunrong1XU Tengfei1
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作者信息:1.南昌轨道交通集团有限公司，330038，南昌
2.西南交通大学土木工程学院，610031，成都
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Affiliation:1.Nanchang Rail Transit Group Co., Ltd., 330038, Nanchang, China
2.School of Civil Engineering, Southwest Jiaotong University, 610031, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.07.021
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中图分类号/CLCN:TU753;U231
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栏目/Col:研究报告
摘要:
［目的］盾构隧道穿越富水泥质粉砂岩地层时会出现多环管片整体上浮的现象，导致管片出现破损、错台、姿态超限等质量缺陷。为保证盾构隧道成型质量，需对管片上浮影响因素进行研究。［方法］基于盾构隧道纵向刚度折减理论和管片施工阶段受力特点，建立管片施工期纵向整体上浮有限元分析模型，研究管片衬砌结构纵向刚度及动、静浮力因素对盾构隧道长距离、大范围上浮挠曲变形的影响规律。［结果及结论］管片上浮影响因素主要包括静浮力因素、动浮力因素和姿态控制因素。管片最大上浮量发生在脱离盾尾第5环—第8环处。纵向刚度越小，最大上浮位置越靠近盾尾；纵向刚度越大，隧道越呈现长范围整体抬起现象。当水头高度位于管片顶部以上时，管片上浮量不随静水头高度而改变，且静水浮力造成的管片上浮量不超过30%。管片环最大上浮位置不随注浆压力的改变而改变，注浆压力仅影响管片最大上浮量，且最大上浮量与注浆压力线性相关。
Abstracts:
［Objective］ When shield tunnels crossing water-rich muddy siltstone stratum, the phenomenon of multi-ring tunnel segment overall floating often occurs, leading to quality defects such as segment damage, misalignment, and attitude exceeding limits. To ensure the quality of shield tunnel formation, it is necessary to study the influencing factors on segment floating. ［Method］ Based on the longitudinal stiffness reduction theory of shield tunnel and the stress characteristics during segment construction, a finite element analysis model of longitudinal overall floating during segment construction is established. The influence law of segment lining structure longitudinal rigidity, dynamic and static buoyancy factors on long-distance and large-scale floating deflection deformation in shield tunnels is studied. ［Result & Conclusion］ Factors influencing segment floatation mainly include static buoyancy, dynamic buoyancy, and attitude control. The maximum segment floating occurs between the 5th and 8th rings behind the shield tail. The smaller the longitudinal stiffness, the closer the maximum floating occurs to the shield tail; the larger the longitudinal stiffness, the more the long-range overall heave phenomenon of the tunnel. When the water head height is above the segment top, the segment floating volume will not change with the static water head height, and the floatation caused by static buoyancy does not exceed 30%. The position of the maximum segment floating will not change with the changes in grouting pressure, and the grouting pressure only affects the maximum floating value of the segment, with the maximum floating value linearly correlated with the grouting pressure.
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