高速铁路CFG桩柔性载荷试验数值模拟分析

Numerical Simulation Analysis of Flexible Load Test of CFG Pile Composite Foundation of High-Speed Railway

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 pile has been widely applied in the subgrade of high-speed railways. The current evaluation method for bearing capacity of CFG pile composite foundation of high-speed railway is according to Technical code for testing of building pile foundations, which simulates the effect of rigid base on composite foundation, but for railway foundation mainly with flexible base, the testing result inevitably deviates from practical situation. Therefore, this paper studies a method for load test of composite foundations applicable for the action principle of high-speed railway flexible foundations and compares pile and soil stress and displacement distribution of CFG pile composite foundation under the effect of rigid load and flexible load through numerical analysis. The result proves that flexible load test is feasible.