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运用有限元程序及有限差分程序研究了新建地下风险工程对既有地铁车站结构的影响。结合既有车站双层风道与西南出入口结构之间的新建3号联络通道施工引起的位移分析,阐述了不同数值方法用于近接工程施工安全性评估的特点,并检算既有结构的承载力,结合既有结构现状调查结果,给出评估结论及推荐施工控制指标:地表沉降不超过7 mm,地表隆起不超过8 mm;车站底板隆起位移控制在7 mm以内,沉降缝两侧结构隆起位移差控制在2 mm以内;轨道的隆起位移不超过5.8 mm,轨道水平不超过±0.6 mm。在上述位移控制指标范围内,得出新建隧道施工后既有地铁结构是安全的。
The finite element program and the finite difference program are used to study the influence of the new underground risk project on the existing metro station structure. Based on the analysis of the displacement caused by the construction of the new No. 3 connecting channel between the existing double-decker wind tunnel and the southwest entrance and exit structure, the characteristics of different numerical methods used in the construction safety assessment of close-coupled projects are expounded and the bearing capacity of the existing structure is checked Force, combined with the findings of existing structural status quo, given the assessment conclusions and recommended construction control indicators: surface subsidence does not exceed 7 mm, surface bump up to 8 mm; station floor uplift displacement control within 7 mm, both sides of the settlement seam uplift Displacement control within 2 mm; track uplift displacement does not exceed 5.8 mm, track level does not exceed ± 0.6 mm. Within the above range of displacement control index, it is concluded that the existing subway structure is safe after construction of the new tunnel.