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以南京长江隧道浦口深基坑工程为例,介绍了深基坑工程施工安全监测和信息化施工手段。针对不同的维护结构,设计了不同类型的监测断面,监测内容包括沉降与位移、基坑底部隆起、地下水位、支护桩内力、支撑轴力和水土压力等。结合施工工况分别对引道段、暗埋段、井后续段、盾构始发工作井及周边环境的监测数据进行了分析,表明基坑外侧降水可改善支护结构受力情况,但大面积降水对工程周边环境影响较大,基坑支护结构变形和内力与支撑设置及工况密切相关,反馈的意见实时指导了施工。研究成果可为今后类似工程的设计、施工和研究提供有益的借鉴和参考。
Taking Pukou deep foundation pit project of Nanjing Yangtze River Tunnel as an example, the construction safety monitoring and information construction methods of deep foundation pit excavation are introduced. According to different maintenance structures, different types of monitoring sections are designed. The monitoring contents include settlement and displacement, bottom of foundation pit, groundwater level, internal force of supporting pile, supporting axial force and water-soil pressure. Combined with the construction conditions, the monitoring data of the approach section, the buried section, the subsequent section of the well, the working well of the shield tunnel and the surrounding environment are respectively analyzed, which shows that the external dewatering of the foundation pit can improve the bearing capacity of the supporting structure, The area precipitation has a great influence on the surrounding environment of the project. The deformation and internal forces of the supporting structure of the foundation pit are closely related to the setting of support and working conditions, and the feedback opinions guide the construction in real time. The research results can provide useful reference and reference for the design, construction and research of similar projects in the future.