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结合北京房山线工程郭公庄站后折返区间的施工难点,在施工期间建立了地表沉降监测及预警系统,通过现场监测和数据分析及反馈,及时有效地保证了工程施工安全。从单双洞过渡段的沉降监测方案制定,预警系统设计等方面总结了该隧道施工的关键经验,分析了该阶段监测结果及地表沉降规律,对于类似浅埋暗挖工程具有一定的借鉴意义。
Combined with the construction difficulties of the return section of Guo Gongzhuang Station in Beijing Fangshan Line Project, a monitoring and early warning system for surface subsidence has been established during the construction period. The on-site monitoring, data analysis and feedback have ensured the construction safety in a timely and effective manner. This paper summarizes the key experience of this tunnel construction from the aspects of the settlement monitoring plan and the design of early warning system in the transition period of single and double tunnels. The monitoring results and the law of surface subsidence at this stage are analyzed, which is of some reference significance to the similar shallow burying and undercutting project.