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CFG桩已在高速铁路路基上大量应用,但目前评价高速铁路CFG桩复合地基承载力均按《建筑基桩检测技术规范》的方法进行。该法模拟的是刚性基础对复合地基的作用,应用到以柔性基础为主的铁路路基,其试验结果必然与实际情况存在偏差,因此文中研究了一种适合于高速铁路柔性基础作用原理的复合地基载荷试验方法,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、土应力及位移分布情况,结果证明柔性载荷试验是可行的。
CFG piles have been widely used in high-speed railway subgrade. However, the current assessment of high-speed railway CFG pile composite foundation bearing capacity are based on “building foundation piles Detection Technical Specifications” method. This method simulates the effect of rigid foundation on composite foundation and applies to the railway subgrade mainly based on flexible foundation. The test results will inevitably deviate from the actual situation. Therefore, the paper studies a compound suitable for the principle of flexible foundation of high-speed railway The ground-based load test method is used to compare the pile-soil stress and displacement distribution of CFG-piled composite foundation under the condition of rigid load and flexible load by numerical analysis. The results show that the flexible load test is feasible.