摘要
高速铁路建设的迅速发展及高速铁路对路基沉降的严格要求,CFG桩在高速铁路路基的处理上得到大量运用。但铁路工程对路基的作用原理与工民建工程对地基的作用原理有本质的区别,工民建房屋建筑荷载通过基础对地基施加刚性荷载,而铁路路基直接承受上部路堤的自重和列车运行产生的柔性荷载。高速铁路CFG桩复合地基的设计都是根据工民建行业的设计理论进行,其试验结果必然与实际情况存在偏差。本文着手研究适合于高速铁路复合地基的柔性载荷试验方法,模拟高速铁路柔性加载的特性,通过数值分析对比了刚性荷载和柔性载荷作用下CFG桩复合地基的桩、土应力、位移分布情况;通过现场载荷试验对设计方案进行了验证,研究了高速铁路CFG桩复合地基的承载力特性,结果证明柔性载荷试验是可行的,能合理的模拟高速铁路CFG桩复合地基承载特性,可为柔性基础下CFG桩复合地基的设计提供基础。
In this paper, the pile and soil stress and displacement of CFG pile composite foundation of high - speed railway are numerically simulated under rigid and flexible loading conditions. The numerical results indicate the settlement and the ratio of pile loading distribution in the flexible loading test are less than those in the rigid loading test. So there is a difference settlement between pile and soil. Field loading tests were carried out to study and validate results of the rigid and flexible loading the composite foundation bearing tests of the CFG pile composite foundation. It was found that capacity under railway flexible load was controlled by the soil between piles. The soil between piles was the first to damage, then the whole composite foundation failed. The test results show that the flexible loading test with cushion is available and can simulate the beating capacity of CFG pile composite foundation more reasonable. The tests also provide a basis for the design of CFG pile composite foundation under flexible conditions.
出处
《工程地质学报》
CSCD
2008年第6期813-819,共7页
Journal of Engineering Geology
关键词
高速铁路
CFG桩复合地基
数值模拟
柔性载荷试验
High - speed railway, CFG pile composite foundation, Numerical analysis, Flexible loading test, Field test
