B-M法在京沪高速铁路济南西站PHC桩复合地基沉降计算中的应用

摘要

PHC pile composite foundation is an effective means to reinforce deep soft soil foundation, but for it at present there is no relatively developed method and theory. Based on the project of Ji'nan west railway station on Beijing - Shanghai high-speed railway, this paper analyzes the existing problems of traditional settlement calculation methods when applied to PHC pile composite foundation, and puts forward Boussinesq-Mindlin combined method to obtain the additional stresses, and then using the layer to layer summation method to obtain the settlements of PHC pile composite foundation. The calculated results were close to measured ones.%PHC桩复合地基是一种有效的深厚软土地基加固处理方法.目前对PHC桩复合地基沉降尚未形成比较成熟的计算理论和方法,以京沪高速铁路济南西站为依托,分析了常规复合地基沉降计算方法在PHC桩复合地基沉降计算方面存在的问题,提出了Boussinesq-Mindlin联合求解附加应力的方法,再联合分层总和法计算PHC桩复合地基的沉降,计算结果与现场实测结果较为接近.