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基于某地铁暗挖站的临时横通道的开挖施工对其邻近的既有地铁隧道结构可能带来的结构安全影响,从数值结构分析的角度,建立地层力学模型,考虑了初始平衡状态、施工开挖过程导致沉降变形又再次引起新的平衡状态等,给出了关键截面处的实际内力在几个不同过程中的变化数值,并与结构的极限承载力进行比较,以此判断结构的安全性。同时,分析各阶段引起的既有区间结构变形缝位置的水平及竖向差异变形,判定是否满足行车运营的安全。这些成果对于进一步合理设计与施工及进行既有结构的安全观测具有重要的参考意义。
Based on the possible structural safety impact of the temporary cross-tunnel excavation on the adjacent subway tunnel structure, from the point of numerical structure analysis, the stratum mechanics model is established, the initial equilibrium state is considered, the construction The excavation process leads to settlement deformation and again brings about a new equilibrium state. The change of actual internal force at several key sections in several different processes is given and compared with the ultimate bearing capacity of the structure to judge the safety of the structure Sex. At the same time, the paper analyzes the horizontal and vertical differences and deformations of the deformation joints of the existing interval structures caused by each stage, and determines whether it meets the safety of driving operation. These achievements have important reference significance for further reasonable design and construction and safety observation of the existing structure.