桩网与桩筏板复合地基沉降变形特性对比研究

Contrastive Study on Settlement Deformation Characteristics of the Pile-Net and Pile-Raft Composite Foundation

桩网和桩筏板结构形式的刚性桩复合地基广泛应用于铁路、公路、城市轨道交通等工程中的软基加固处理,在大幅降低地基沉降的基础上可有效控制工后沉降。本文基于某高铁软基加固段桩网复合地基和桩筏板复合地基现场沉降监测结果,对比分析桩网和桩筏板两种结构形式的刚性桩复合地基沉降变形特点及沉降控制效果,并对桩网和桩筏板结构形式的刚性桩复合地基工作机理进行研究。根据两种刚性桩加固方案对沉降变形实际控制效果,提出现有刚性桩加固方案适用范围。研究成果可有效应用于软基加固处理中的刚性桩复合地基方案选型,对铁路、公路等工程路基设计具有指导意义。

Rigid pile composite foundation such as pile-net and pile-raft was widely used in soft soil reinforced as in the field of railway,highway and urban rail transit,which can effectively control the post-construction settlement on the basis of greatly reducing foundation settlement.In this paper,the settlement deformation characteristics and settlement control effects of pilenet and pile-raft composite rigid pile foundation were compared and analyzed based on the field settlement monitoring results of the two structural composite foundation in the soft foundation reinforced section of a high-speed railway,and the working mechanisms of pile-net and pile-raft composite rigid pile foundation were studied accordingly.According with the actual control effects of the two schemes on settlement deformation,the application range of existing rigid pile reinforcement scheme was presented.The research result can be effectively applied to the selection of rigid pile composite foundation in soft soil reinforced treatment,and has guiding significance for the subgrade design of railway,highway and other engineering.