城市轨道交通枢纽站超深基坑的施工风险控制

Risk Controlling Technology of Super Deep Excavation in Urban Metro Hub Construction

城市轨道交通枢纽站建设通常面临敏感环境下超深基坑施工的挑战,该项施工风险很大.结合长期工程实践,提出以消除风险源和控制风险事件为手段的施工风险'五步控制法'.该方法强调施工方作为超深基坑系统工程中风险管理的最终执行者,应该与勘察、设计和业主等工程各方密切协作,全过程参与工程的风险控制,从勘察资料复核、设计建议和协商、施工过程控制、监测数据综合分析与反馈以及风险事件的应急响应等方面将勘察、设计和施工等阶段积累起来的风险因素逐步化解,从而大幅提高工程安全度.

Urban metro hub construction faces a large number of deep excavations in downtown districts which exist many risks. This paper proposes a risk controlling method called ＂five steps in risk control-ling＂ to eliminate the sources of risks and control the risk events. This method emphasizes that excavation is a systematic project which risks come from every phase, such as investigation phase, design phase, and construction phase. As the final executive of risk controlling, construction side should participate the risk management of the whole course of the excavation project. The five steps in risk controlling mainly include rechecking of the investigation data, negotiation of the design scheme, construction process control, analy-zing and feedback of the monitoring data, and the emergency response of the risk events. This method will be helpful for controlling the risks of deep excavation in large metro hub constructing.