Research on Safety Assessment of Existing Tall Structures Adjacent to Metro
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摘要: 针对城市轨道交通施工对邻近高耸结构的安全扰动问题,以某电视塔为例,针对其紧邻地铁换乘站及盾构区间的近接施工场景,开展了系统的结构安全评估研究。采用现场结构检测、长期变形监测与三维数值模拟相结合的技术方法,识别了电视塔结构现状、基础水平、竖向位移演化规律及塔身倾斜特征,精准量化了地铁基坑开挖与盾构隧道施工对电视塔基础及上部结构的影响程度。研究结果表明:该电视塔现状混凝土强度满足设计要求,历史累积基础倾斜率为1.3‰;数值模拟预测后续施工将使倾斜率新增0.31‰,叠加后总倾斜率1.61‰,仍满足安全要求;基于分析结果提出了针对性的变形控制标准与工程建议。Abstract: To address the safety disturbance caused by urban rail transit construction to adjacent tall structures, this study conducted a systematic structural safety assessment on a TV tower in the context of construction adjacent to a metro transfer station and a shield tunnel. Field structural inspection, long-term deformation monitoring, and three-dimensional numerical simulation were integrated to assess the current condition of the TV tower structure, the evolution patterns of horizontal and vertical foundation displacements, and the inclination characteristics of the tower body. These methods also accurately quantified the impacts of metro foundation pit excavation and shield tunnel construction on the tower's foundation and superstructure. The results showed that the current concrete strength of the TV tower meets the design requirements, with a historically accumulated foundation inclination ratio of 1.3‰. Numerical simulation predicted that subsequent construction would increase the inclination ratio by 0.31‰, resulting in a total inclination ratio of 1.61‰, which still meets safety requirements. Based on these findings, targeted deformation control standards and engineering recommendations were proposed.
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