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下穿铁路箱涵的双线盾构区间施工时将引起周边土体的扰动,从而对箱涵结构的沉降变形和稳定性产生影响。本文结合实际工程采用有限元数值模拟,分析该工程的技术特点、难点及存在的风险,对盾构区间施工引起的周边土体和箱涵的变形特征进行了分析总结,并提出了合理的控制变形的措施和建议,以确保运行线路的各项控制指标满足安全评估的要求。
The construction of double shield tunnel under railway box culvert will cause disturbances to the surrounding soil, which will affect the settlement deformation and stability of the box culvert structure. In this paper, the finite element numerical simulation is used to analyze the technical characteristics, difficulties and risks of the project. The deformation characteristics of the surrounding soil and box culvert caused by the construction of the shield are analyzed and summarized, and the reasonable control Deformation measures and recommendations to ensure that the operation of the line control indicators to meet the safety assessment requirements.