Abstract: Lots of CFG piles composite foundations are adopted in construction of pumping stations in order to improve the bearing capacity. Due to the existence of difference between upstream and downstream water levels, cement or clay, instead of granular, is often used as cushion materials. A single pile composite foundation finite element model is establiashed by using ABAQUS program, and the influences of the deformation modulus of the difference cushion matrials and the diffreence length of pile on the pile-soil stress ratio are analyzed. The research results will provide a theoretical evidence for the suitable selection of the cushion materials, pile length, pile diameter and will be beneficial to the optimum design of composite foundations.%水利工程中常采用CFG桩复合地基以提高水闸地基的承载力.由于上下游存在水位差,褥垫层材料常采用水泥土或黏性土代替散粒体材料.利用大型通用有限元软件ABAQUS,建立单桩复合地基三维有限元模型,分析了不同褥垫层材料、不同桩体模量及不同桩长对桩土应力比和桩土沉降的影响.为CFG桩复合地基褥垫层材料的选择、桩长及桩体模量的设置提供了依据,有利于复合地基的优化设计.
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