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提出了盾构隧道穿越既有地铁车站结构安全的评估方法,包括风险识别、风险评估及风险控制三方面的内容。以某工程为例,给出了该车站结构的风险等级,通过数值计算,预测了该车站的变形量,分析了车站结构的安全性,提出了变形控制指标。研究结果表明:该车站结构的风险等级为特级,结构安全等级为Ⅰ级,变形控制指标为底板最大沉降为15mm,纵向变形斜率为3‰。
The assessment method of the safety of shield tunnel crossing the existing metro station structure is put forward, which includes three aspects: risk identification, risk assessment and risk control. Taking a project as an example, the risk grade of the station structure is given. Through numerical calculation, the deformation of the station is predicted. The station structure safety is analyzed. The deformation control index is proposed. The results show that the risk grade of the station structure is special grade, the structural safety grade is Grade Ⅰ, the deformation control index is that the maximum settlement of the floor is 15mm, and the longitudinal deformation slope is 3 ‰.