（内蒙古科技大学，包头014010）

［提要］以模型试验为基础，对传统复合地基及变刚度复合地基在竖向荷载作用下的力学性状进行分析研究。通过11组模型试验，对改变桩长的单桩、群桩复合地基及变刚度复合地基在竖向荷载作用下的内力及变形进行了量测和记录，试验揭示了桩土相互作用、荷载传递过程、桩土应力比、荷载分担比等规律。试验结果表明，变桩长CFG桩复合地基受力更合理、造价低、更经济。

［关键词］复合地基；变刚度；桩土应力比；桩土荷载分担比

Research on Pile soil Proportion of Load of Variation Rigidity Composite Foundatio/Yang Yongxin (Innei Mongolia University of Science and Technology, Baotou 014010, China)

Abstract:The mechanics properties of composite foundation and the variation rigidity compositefoundation by scale model tests are studied. Eleven model experiments are conducted, including the single pile, pile group composite foundations with different length, and the variation rigidity composite foundations. The stresses and settlements of the model tests under vertical loads are measured. The principles of pile soil co-interaction, transferring of loads, pile soil stress ratio, pilesoil proportion of load and differential settlements are revealed by experiments. The test results indicate that variable length CFG composite foundation is more reasonable, low cost and more economical.