柔性基础下褥垫层厚度对带帽CFG桩复合地基特性分析

带帽CFG桩复合地基应用于高速铁路处理深厚软土地基工程中,其设计有别于建筑工程的设计。工民建房屋建筑基础为刚性基础,而铁路路基直接承受上部路堤的自重和列车运行产生的动荷载为柔性基础。因此,对于柔性基础条件下CFG桩桩帽复合地基褥垫层厚度的优化十分有意义。在现场载荷试验过程中利用橡胶板模拟高速铁路的柔性路基基础,通过改变褥垫层厚度,研究桩帽复合地基沉降变形及桩土荷载分担特性。

Effect of cushion thickness on deformation characteristics of CFG pile composite foundation with caps under flexible load

The design of CFG piles with caps applied in expressways in deep soft soil ground differs from that of architectural engineering.There is no appropriate criterion at present.The upper building foundation of construction engineering is rigid and rigid load is imposed on the ground.However,the railway subgrade bears directly the roadbed load and the dynamic load of trains which is flexible load.So under the condition of flexible foundation,the optimization of cushion thickness of CFG pile composite foundation with caps is of great significance.In field load tests,rubber plates are used to simulate the flexible foundation of high-speed railway.Through change of cushion thickness,researches on the settlement deformation and load sharing properties of CFG pile composite foundation with caps are conducted.