摘要
设置褥垫层是CFG桩复合地基的关键技术,而褥垫层的设计直接影响到CFG桩复合地基的承载力与变形特性。通过建立三维CFG桩群桩复合地基数值计算模型,采用MIDAS/GTS有限元计算软件模拟了褥垫层厚度对CFG桩复合地基沉降变形与受力特性的影响,并按照路基的工后沉降与CFG桩桩帽、桩间土强度利用率的要求,优化了京沪高速铁路路基基底褥垫层的设计参数。
Cushion layer is one of the key technologies of composite foundation with cement fly-ash gravel pile （CFG pile） , and the design of cushion layer will directly affect the foundation carrying capacity and deformation behavior of CFG pile composite foundation. In this paper, three dimensional numerical model of CFG pile-group composite foundation is established by using finite element analysis software MIDAS/GTS, and then the influence of different cushion layer＇s thicknesses on the settlement deformation and on stress state of CFG pile composite foundation are studied. Furthermore, according to the requirements on subgrade settlement after construction and on strength utilization ratios of CFG pile caps and soils among piles, the design parameters of the cushion layer beneath the subgrade of the Beijing-Shanghai High-speed Railway is optimized.
出处
《铁道标准设计》
北大核心
2013年第9期29-33,共5页
Railway Standard Design
基金
铁道部科技研究开发计划项目(2005G015-H)
关键词
CFG桩
褥垫层厚度
京沪高速铁路
优化分析
cement fly-ash gravel pile
cushion layer＇s thickness
Beijing-Shanghai High-speed Railway
optimization analysis
