组合型复合地基的理论分析与试验研究

通过三维有限元和现场静载试验对组合型复合地基的受力和位移特性进行了研究,并把理论计算结果与实测结果进行了对比分析,理论分析和试验结果表明：在组合型复合地基中,由于各桩之间相互影响,桩长较短、刚度较小的RSC桩的单桩承载力同单桩相比差别不大;而桩长较长、刚度较大的水泥粉煤灰碎石桩（简称CFG桩）的单桩承载力比单桩减小较多.在湿陷性黄土地区,采用具有挤密作用的RSC桩可以消除地基土的湿陷性,采用刚度大的CFG桩可以大幅度提高复合地基的承载力.

Theoretical Analysis and Experimental Research on Combined Composite Foundation

This paper presents a 3D-FEM simulation and field static plate loading test for combined composite foundation with cement-flyash-gravel(CFG) piles and rammed soil-cement(RSC) piles.Calculation results and field test show that because of the interaction of different piles in the combined composite ground,the bearing capacity of RSC pile with short length and less stiffness is almost the same as that of the single RSC pile.However,the bearing capacity of CFG pile with long length and more stiffness is much smaller than that of the single CFG pile.In the loess area,hydro-compaction settlement of soil can be eliminated using compacted RSC pile,and the bearing capacity of composite foundation can also be greatly improved using bigger stiffness CFG pile.