邻近运营地铁的深基坑开挖风险及控制措施

Excavation Risk and Control Measures of Deep Foundation Excavation Adjacent to Operating Subway

在邻近运营地铁的环境下施工深基坑,面临基坑支护结构变形,甚至运营地铁车站及盾构隧道变形甚至破坏的风险,为有效控制该基坑变形,保证运营地铁安全,对天阅海河项目中的中穿地铁基坑群概况、水文地质、周边环境、地铁与基坑变形控制指标等进行调查研究,结合中穿基坑群运营地铁监测数据及坑内外降水井数据,探讨基坑开挖过程中的风险因素及控制措施,结果表明,通过上方填土、土体加固、深层注浆、分层分块对称限时开挖等施工措施,可有效控制对地铁隧道结构变形的影响。

The main risk of deep foundation excavation construction in the environment adjacent to the operating subway is confronted with the deformation and even damage of subway station, and shield tunnel caused by the deformation of foundation excavation supporting structure. In order to effectively control the deformation of foundation excavation and ensure the safety. This paper discusses the risk factors and control measures in the process of foundation excavation based on the example of earth excavation of background engineering, combined with the monitoring data of subway running through foundation excavation group, as well as the data of dewatering wells inside and outside the pit. Construction measures such as filling above, soil reinforcement, deep grouting, layered and block symmetrical limited time excavation can effectively control the influence on the structural deformation of subway tunnel.