综合交通枢纽地下深基坑分坑设计与变形分析

Pit Division Design and Deformation Analysis of Underground Deep Foundation Pit for Comprehensive Transportation Hub

摘要:

为了深入认识基坑群开挖对自身及周边环境的影响，探索有效的基坑群开挖变形控制措施，确保工程安全与高效实施。基于宁波市枢纽空铁一体主体工程综合交通中心（GTC）项目，按照“风险可控、成本最优、施工便利、工期节省”的原则，提出了合理的基坑群分坑与围护结构设计方案。通过对基坑群分区开挖的典型剖面进行数值建模分析，结果表明：合理的分坑方案以及围护体系加强措施对该类深大基坑群安全开挖具有显著效果。研究成果可为软土地区类似大规模基坑群设计与分坑优化提供参考。

Abstract:

In order to further understand the impact of excavation of the foundation pit group on the pit and the surrounding environment, the effective deformation control measures for excavation of foundation pits are explored to ensure the safety and efficient implementation of the project. Based on the Comprehensive Transportation Center (GTC) Project in the Ningbo Hub Air-Rail Integrated Main Project, a reasonable design scheme for the pit division and enclosure structure of the foundation pit group is proposed according to the principles of "controllable risk, optimal cost, convenient construction and time-saving". The numerical modeling analysis is conducted on the typical profiles of the zone excavation of the foundation pit group. The results show that a reasonable pit division scheme and the reinforcement measures for the enclosure system have had significant effects on the safe excavation of this type of deep and large foundation pit group. The research results can provide a reference for the design and pit division optimization of similar large-scale foundation pit groups in soft soil areas.