| 考虑注浆填充率的大直径盾构管片上浮解析解与应用 |
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| 引用本文： | 付艳斌,梅超,卞跃威,张小龙,王福道,胡瑜.考虑注浆填充率的大直径盾构管片上浮解析解与应用[J].中国公路学报,2022,35(11):171-179. |
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| 作者姓名： | 付艳斌 梅超 卞跃威 张小龙 王福道 胡瑜 |
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| 作者单位： | 1. 深圳大学 土木与交通工程学院, 广东 深圳 518060;2. 深圳大学 滨海城市韧性基础设施教育部重点实验室, 广东 深圳 518060;3. 上海市隧道工程轨道交通设计研究院, 上海 200235 |
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| 基金项目： | 广东省重点领域研发计划项目（2019B111108001，2022B0101070001）；国家自然科学基金项目（52078304，51938008，52090084）；深圳市基础研究项目（20220525163716003） |
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| 摘 要： | 大直径盾构隧道管片上浮问题是目前隧道建设难点。以大直径盾构隧道施工阶段管片上浮问题为背景，研究硬岩地层大直径盾构管片上浮影响因素，并考虑管片壁后同步注浆的填充效果，深入探究大直径管片上浮规律，为盾构施工速度和注浆效果的控制提供参考依据。根据硬岩地层大直径盾构注浆填充率不足的特点，从管片横向受力角度建立单环管片上浮计算公式。基于弹性地基梁理论建立隧道纵向上浮分析模型，通过梁的挠曲线微分方程并结合边界条件与变形协调方程，推导出考虑浆液填充率和时效性的管片上浮变形及内力的简易解析解，进而采用总量法获得了隧道纵向多环累计上浮量。结合工程实例进行了参数敏感性分析，研究结果表明：隧道管片上浮解析解的计算结果与实际工程监测数据吻合良好，能够有效揭示隧道上浮过程中的变形规律、管片弯矩和剪力变化特征；上浮规律表现为激增段、缓降段和平稳段；浆液填充率、时效性和地基基床系数对大直径盾构上浮比较敏感，盾体间隙的增大易导致填充率不足，同步注浆应严格控制注浆压力和注浆量；浆液初凝时间和掘进速度直接决定单次注浆影响范围和上浮力大小。研究结果可用于盾构隧道管片上浮及变形预测，在掘进过程中可根据影响因素与上浮关系进一步调整施工参数，对大直径盾构隧道设计与施工具有一定指导意义。
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| 关 键 词： | 隧道工程 管片上浮 弹性地基梁 同步注浆 填充率 |
| 收稿时间： | 2021-05-01 |
Analytical Solution and Application of Large-diameter Shield Segment Uplift Considering the Filling Rate of Grouting |
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| FU Yan-bin,MEI Chao,BIAN Yue-wei,ZHANG Xiao-long,WANG Fu-dao,HU Yu.Analytical Solution and Application of Large-diameter Shield Segment Uplift Considering the Filling Rate of Grouting[J].China Journal of Highway and Transport,2022,35(11):171-179. |
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| Authors: | FU Yan-bin MEI Chao BIAN Yue-wei ZHANG Xiao-long WANG Fu-dao HU Yu |
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| Affiliation: | 1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China;2. Key Laboratory of Coastal Urban Resilient Infrastructures (MOE), Shenzhen University, Shenzhen 518060, Guangdong, China;3. Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai 200235, China |
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| Abstract: | The uplift of large-diameter shield tunnels is a difficult problem in tunnel engineering. In this study, the problem of segment uplift during the construction stage of large-diameter shield tunnels was explored. The factors affecting the uplift of large-diameter shield segments in hard-rock strata were investigated, and the filling effect of synchronous grouting after the segment walls was considered. The floating rule of large-diameter segments was revealed, which provided a reference basis for the control of shield construction speed and grouting effect. Based on the characteristics of the insufficient grouting filling rate of large-diameter shield tunnels in hard-rock strata,a calculation formula for single-ring segment uplift was established from the perspective of the transverse force. A tunnel longitudinal structure model was proposed according to the theory of elastic foundation beams. Differential equations of the beam deflection line, boundary conditions, and deformation coordination were combined to establish the analytical solution of the deformation and internal force of the tunnel segment uplift, which considered the grout filling rate and time dependency. The polycyclic and cumulative uplift values of tunnel segments were obtained using the total-amount method. A parameter sensitivity analysis was carried out based on an engineering example. The results showed that the analytical solutions satisfactorily agreed with the actual project. It can effectively reveal the deformation law, segment bending moment, and shear force change characteristics during tunnel ascent. The uplift trend of the tunnel can be divided into sharp increase section, slow-down descent section, and stable section. The grout filling rate, time dependency, and foundation coefficient were sensitive to the large-diameter shield tunnel uplift. An increase in the tail gap easily leads to an insufficient filling rate. Grouting pressure and quantity should be provided during synchronous grouting. The initial setting time of grouting and advancing speed directly influence the uplift range. The results can be used to predict the uplift value and deformation of shield segments. In addition, construction parameters can be further adjusted according to the relationship between the influencing factors and uplift in the process of tunneling, which has a certain guiding significance in the design and construction of large-diameter shield tunnels. |
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| Keywords: | tunnel engineering segments uplift elastic foundation beam simultaneous grouting filling rate |
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