管桩加固软土路基的工作性状研究

管桩加固软土地基作为一种新型的软土路基的加固形式，是一种柔性基础下刚性垫层的复合地基，与承台下柔性垫层复合地基存在较大差异，在设计中存在对其工作性状认识不清的情况。鉴于这样一种情况，对管桩刚性桩复合地基的工作性状及其组成和协同工作机理进行研究，并针对某高速公路管桩加固软土路段的一个断面，采用数值模拟方法对褥垫层设置进行了研究，指出了路堤填土下复合地基的褥垫层设置与承台基础下垫层设置的不同之处，并提出了一些合理化建议，为设计和施工人员提供参考。

STUDY ON THE WORKING PERFORMANCE OF TUBULAR PILE COMPOSITE FOUNDATION OF FREEWAY

Soft soil foundation reinforced by tubular pile is a type of rigid cushion composite foundation under flexible base, and it is different from flexible cushion composite foundation under rigid base. As one of the new consolidation type of soft soil foundation, the working performance of tubular pile composite foundation is not exactly known in design and construction the working performance of tubular pile composite foundation is studied and the composition and working mechanism of the tubular pile composite foundation are also analyzed. Finite element method is adopted to study cushion setting by imitating one section of the composite foundation of a freeway. The differences between composite foundation under road and composite foundation under rigid base are pointed out; and some reasonable suggestions about cushion treatment for the engineer are put forward, which can be used in similar engineering.