折线形布桩深基坑空间效应分析

摘要

以中航广场二期基坑西北角折线形排桩支护为例,对折线形布桩支护方案空间效应进行了分析,有限元分析时采用了考虑与不考虑桩间挡土板贡献两种情况,并与实测结果进行了对比.在此基础上提出了折线型布桩设计理念,以设计深度为8 m的基坑为例,对多种纵、横向冠梁长度情况下的折线形布桩基坑支护效果进行了分析,提出了横向、纵向冠梁的合理取值建议,并与双排桩支护方案进行了对比,结果表明:在相同支护效果的情况下,折线形布桩的工程造价低于双排桩,具有较好的应用前景.%Based on the northwest corner of Air China Square excavation,which are designed using polygonal plane layout retaining pile.Spatial effects of polygonal plane layout cantilever retaining pile are studied by finite element analysis method,with and without slab between adjacent piles.The calculation data are compared with the tested data.On the basis,the polygonal plane layout pile design methods are proposed.Take eight meters deep excavations as examples,considering different transverse and longitudinal lengths of polygonal plane capping beam,supporting effects and spatial effects of polygonal plane layout excavations are further studied,and reasonable transverse and longitudinal capping beam lengths are proposed.Comparing with double row piles,the results show that the polygonal plane layout retaining piles cost is lower than the double row retaining piles under the same supporting effect,and have a good application prospect.