地铁车站预留下穿围护的技术措施及风险控制

Technique and Risk Control of Reserved Underneath Bracing in Subway Station

为满足地铁车站预留下穿的需要,并保证先建车站预留下穿范围段的围护安全,在上海轨道交通某车站主体穿越区范围采取的加长连续墙、使用玻璃纤维钢筋、桩基托换等多项具体措施。并对现场监测发现的实际开挖变形异常加以说明,同时就应急方案和风险成因进行了细致分析,为类似工程提供了有益参考。

In order to satisfy the demand of station reserved underneath passing space, and ensure the safety of pre-constructed station pit bracing structure, many specific measurements are adopted ih the subway station in Shanghai, according to the engineering geological conditions and the design requirement. Measurements include lengthening the continuous walls, using fiberglass reinforcement and piled foundation underpinning etc.. Then, the abnormal deformation obtained from the field monitoring is discussed during excavation. The emergency scheme and the risk causes are analyzed in detail, which provides useful refer- ence for similar projects.