长螺旋法CFG桩在客运专线复合地基中的应用研究

研究目的：长螺旋法CFG桩在客运专线复合地基中的应用效果。 研究方法：通过武广客运专线武汉工程试验段大面积CFG桩应用于松软土复合地基处理的工程实践，结合工程地质条件，从施工方法选择，工艺流程设计，质量控制等几个方面对长螺旋法CFG桩施工在客运专线铁路中的应用进行系统性应用研究。 研究结果：综合考虑常用CFG桩施工机械的性能、适宜地质条件、成桩质量及对相邻桩的影响程度等因素，以及长螺旋钻机成孔管内泵压混合料成桩工艺的特点，能够较好地满足承载力和设计变形值要求，能较好地控制工后沉降，加固效果明显，经济可行。 研究结论：长螺旋法CFG桩施工适用于客运专线复合地基加固处理。

Reseach on Application of CFG Pile by Long Auger Machine in Reinforcement of Compound Subgrade of Passenger Dedicated Line

Research purposes:The purposes are to do the research on the effects of CFG pile by long auger machine applied in reinforcing the compound subgrade of passenger dedicated line.Research methods:In combination with the engineering practice of reinforcing soft compound subgrade in Wuhan experiment section of Wuchang-Guangzhou Passenger Dedicated Line with CFG pile,the systematically applied researches are done on the application of CFG pile by long auger machine in reinforcing compound subgrade of passenger dedicated line,including the choose of construction method,design of technical process and quality control,according to the engineering geological conditions.Research results:With the considerations of the performances of common construction machinery for CFG pile,geological conditions suited for CFG pile,quality of pile formation and its influence on the adjacent pile,and the features of CFG pile by long auger machine,it can better meet the requirements of bearing capacity and deformation value of design,better control of post-construction settlement,good reinforcement result and financial feasibility.Research conclusions:CFG pile by long auger machine is suitable for reinforcing the compound subgrade of passenger dedicated line.