Design and practice of partitioning of deep large foundation pits close to subway in thick soft soils
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摘要: 宁波绿地中心项目处于深厚软土地层,基坑面积约41000 m2,挖深15.9~18.1 m,周围环绕着地铁站,地段隧道,桥梁和地下车道,周围环境复杂。结合基坑特点,基坑支护结构设计采用“分区顺作”+“板式支护”+“多道支撑”的支护体系方案。为了减少基坑开挖对周围环境,特别是地铁隧道的影响,该项目采取了多种技术措施。详细介绍了基坑分区思路、轴力补偿钢支撑、隔离桩等设计思路。实施结果及监测数据表明,采取的技术措施取得了很好的实施效果,整个施工过程达到了安全可控的目标,亦为类似工程提供参考。Abstract: Ningbo Greenland Center Project is located in thick soft soils. The area and excavation depth of the foundation pit are about 41000 m2 and 15.9~18.1 m, respectively. The surrounding environment of the pit is complex, which is close to subway station, tunnels, bridge and underground lane. According to the characteristics of the project, the support structures of foundation pit are designed using the support system, which is "partitioning and making" and "retaining structures + multilayer support". In order to reduce the influences of excavation of the foundation pit on the surrounding environment, especially the subway tunnel, multiple technical measures are adopted. The partitioning of the foundation pit, steel support for axial force compensation and partitioning piles are introduced. The results of the implementation and monitoring data show that the technical measures have achieved good effectiveness, the safe and controllable is achieved goal during the entire construction process. It may provide a reference for similar projects.
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