中文摘要
CFG桩复合地基自首次应用于铁路路基以来，十几年来得到了广泛的推广，特别是高速铁路建设领域，现今已具有相当的理论研究成果和一定的工程实践经验。CFG桩复合地基在铁路上的应用推广使得铁路桥梁的建设量大大减少，降低了工程造价，且便于施工。
目前，关于桩土相互作用和桩土荷载分担比的计算没有相关规范给出方法，只能通过以往的工程经验进行估计或现场实测。故本文旨在根据重载铁路高路基、湿陷性黄土的工程地质条件，参照相关规范与工程实例，对计算参数进行合理取值，设计得出最终方案。
本文主要研究成果如下：
（1）通过收集资料、规范学习，明确了设计思路，掌握了相应的设计理论及相关公式，了解了CFG桩复合地基与桩基的差异；
（2）通过阅读相关工程案例及研究资料，了解了CFG桩复合地基设计理论及所需的参数；
（3）通过规范给出的公式，计算了CFG桩单桩承载力、复合地基承载力特征值以及地基沉降等；
（4）综合多种桩长、桩径和桩间距的承载力及沉降验算，得出了合理设计方案，并归纳了桩长、桩间距（单排布桩）对内力变形的影响；
（5）展望了CFG桩复合地基的应用前景。
关键词：CFG桩复合地基：湿陷性黄土；重载铁路；承载力：地基沉降
Abstract
CFG pile composite foundation has been widely used in recent years since it was applied in railway embankment a decade ago, especially in high speed railway construction. There have been quite theory research and some engineering practical experience to meet the construction requirements. The application of CFG pile composite foundation on the railway makes the amount of bridges reduced., and its engineering cost is much less than bridges. The construction is also very convenient.
At,present, there is no relevant specification of calculating methods on pile-soil interaction and load sharing ratio. It can be only estimated through the past experience or field measurements. So the paper is designed to choose the reasonable values of the parameters by considering the high emnankment of heavy haul railway and loess engineering geological condition, and refering relevant norms and project examples. Finally design scheme by calculating.
The main research results of this paper are as follows:
(1) Through the data collection and standards studying, clear the design ideas, master the corresponding design theory and the relevant formula, and know the differences between the CFG pile composite foundation design and ordinary pile foundation design;
(2) Through the related standard formula given, collect theory basis and calculate the parameters of CFG pile composite foundation;
(3) Through the related standard formula given, calculate the CFG pile composite foundation bearing capacity of single pile, composite foundation bearing capacity and settlement of foundation;
(4) Combined the different parameters(pile length, diameter and spacing) of calculating CFG pile composite foundation data, obtain the final design scheme , and summarize the effect of the pile spacing (singles pike numbers ) and the pile length on the internal force deformation;
(5) The applicable scope of CFG pile composite foundation.
Key words: CFG pile composite foundation; loess region; heavy haul railway; bearing capacity; settlement of foundation
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