滨海欠固结地层深基坑群围护结构侧移预警指标研究

Study on the Early Warning Index of Deflection of Deep Foundation Excavation Group in Coastal Under-consolidated Stratum

滨海深厚欠固结地层的深基坑变形较大,确定合理的围护结构侧移预警指标是实施基坑工程信息化施工并保证安全施工的前提。因此,以横琴口岸基坑群为例,参考国内现行规范及有关条文,借鉴类似工程经验,综合考虑规范建议值、工程类比值、设计计算值和有限元计算结果,提出了滨海欠固结土层深基坑围护结构侧移预警指标,并提出了"分区、分级、分阶段"监控预警的原则,构建的侧移预警指标在横琴口岸基坑群工程中得到了成功应用,有效平衡了施工安全与工程进度。

Foundation excavation in the coastal under-consolidated soil stratum often have a large deflection,resulting in the necessary of a suitable early warning index of deflection of retaining structure.The index system plays a fundaental role in the information construction and the safe construction.Therefore,taking the foundation excavation group of Hengqin port as an exaple,this paper proposes the early warning index of deflection of retaining structure in coastal under-consolidated soil stratu with the consideration of the suggested value of code based on experience,the designed value and the nuerical results.Moreover,the principle of monitoring and early warning as zoning,grading and phased is put forward.And the constructed lateral displacement early warning index has been successfully applied in the foundation excavation group project of Hengqin port,which effectively balances the construction safety and project progress.