紧邻新建地铁深基坑的既有地铁结构安全性评估与监控

既有地铁13号线东直门站紧邻首都国际机场线东直门站,并受机场线深大基坑开挖的影响存在重大安全风险。为了控制安全风险,本工程在设计阶段通过数值模拟手段计算分析了既有13号线车站结构在紧邻深基坑情况下的受力特征,并评估了其安全性,根据评估结论对设计方案进行了优化,之后又在施工过程中采取了监控量测措施,有力地保障了该车站结构的安全。

Safety Evaluation and Monitoring of Existing Railway near the Deep Foundation Pit of Newly Built Railway

The existing Dongzhimen station of Subway Line 13 is adjacent to the Dongzhimen station of Capital International Airport Line and is especially vulnerable to safety risks by the excavation of deep foundation pit of Airport Line. In order to control safety risks, the mechanics characters of structure of the existing stations of Line 13 under the conditions of adjacent to deep foundation pit are calculated and analyzed by numerical simulation during the stage of design, the safety is assessed as well. The design is optimized based on the conclusions of the assessment, and monitoring and measuring are adopted during the construction to effectively ensure the safety of deep foundation pit of Dongzhimen station of Airport Line and the structure of the existing station of Line 13.