GC-CFG组合桩复合地基处理高速铁路基底的应用研究

Study on treatment of GC-CFG composite piles to base of high-speed railway

京津客运铁路在低路堤区域采用GC-CFG桩组合桩复合地基减少上部振动荷载对基底的影响,论文通过组合桩与单一CFG桩复合地基的单桩静载试验、SPT变化特征以及现场的应力和沉降的对比试验验证组合桩复合地基的适宜性。分析结果表明,组合桩复合地基中的碎石桩较大程度增大地基承载力和单桩的承载力,同时又能减小组合桩中CFG桩顶压力,并减小卸载再加载产生的沉降变形。

To reduce influence of top rail vibration on low embankment, the GC-CFG composite piles are used on Beijing-Tianjin inter-city railway. By comparing the results of static pile load tests, standard penetration tests, stress and settlement of GC-CFG composite piles with CFG＇ s, the applicability of GC-CFG composite piles are proved. The results show that the bearing capacity of foundation and capacity of a single pile of GC-CFG composite piles are rapidly increased, whereas the stress on the top of CFG piles or settlement are reduced.