隧道开挖对上覆既有管线影响的简化解析计算方法
董瑞桥1施展斌2
Simplified Analytical Calculation for the Influence of Tunnel Excavation on Overlying Existing Pipelines
DONG Ruiqiao1SHI Zhanbin2
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作者信息:1.中铁十八局集团有限公司， 300222， 天津
2.浙江大学滨海和城市岩土工程研究中心， 310058， 杭州
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Affiliation:1.China Railway 18th Bureau Group Co., Ltd., 300222, Tianjin, China
2.Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, 310058, Hangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.02.005
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中图分类号/CLCN:TU990.3；U231.3
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栏目/Col:学术专论
摘要:
［目的］当盾构隧道下穿既有管线时，会引起既有管线发生沉降变形，因此有必要通过理论计算对隧道开挖引起的上覆既有管线受力变形进行研究。［方法］基于两阶段法提出一种可预测隧道开挖对上覆既有管线变形响应影响的简化计算方法，先采用Loganathan公式获得隧道开挖引起的周围土体自由竖向位移，并把土体自由竖向位移附加在既有管线轴线上，再将既有管线简化为无限长梁搁置于Vlazov地基模型，考虑管线侧向土体的影响，利用有限差分法获得管线纵向变形的解析解。［结果及结论］将所提简化计算方法与既有文献中的实际工程监测数据进行对比，验证了所提简化计算方法的合理性；将所提简化计算方法同退化的Vlazov地基模型及Winkler地基模型计算结果进行对比，验证了所提简化计算方法更贴近实测数据。地层损失率、隧道开挖半径的增大会引起既有管线沉降及弯矩的增大；增大新建隧道与既有管线的夹角能够减小管线沉降，但会造成管线弯矩的增大。
Abstracts:
［Objective］ When a shield tunnel passes under existing pipeline, it can cause settlement and deformation of the existing pipelines. Therefore, it is necessary to study the force and deformation of the overlying existing pipelines caused by tunnel excavation through theoretical calculations. ［Method］ Based on a two-stage method, a simplified calculation method for predicting the deformation response of overlying existing pipelines due to tunnel excavation is proposed. The method first utilizes the Loganathan function to obtain the free vertical displacements of the surrounding soil mass caused by tunnel excavation. These displacements are then applied to the axis of the existing pipelines. The existing pipelines are simplified as infinitely long beams supported on the Vlazov foundation model. Considering the influence of lateral soil mass on the pipeline, the analytical solution for pipeline longitudinal deformation is obtained using the finite difference method. ［Result & Conclusion］ The proposed simplified calculation method is compared with actual engineering monitoring data from existing literature, validating the rationality. A comparison with the results from the degraded Vlazov foundation model and Winkler foundation model validates that the proposed simplified calculation method is closer to measured data. An increase in the ground loss ratio and tunnel excavation radius leads to increased settlement and bending moments in existing pipelines. Increasing the angle between the new tunnel and existing pipelines reduces pipeline settlement but increases bending moments.
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