(1 同济大学地下建筑与工程系 上海 200092； 2 河北工程学院建筑与工程系 邯郸 056038)
［提要］ 通过对设有褥垫层的桩体复合地基承担竖向荷载的理论分析，对褥垫层厚度对桩土协调变形的作用和桩土应力比的调整关系进行了研究，提出了基于桩土褥垫层共同作用理论的复合地基优化设计方法。通过现场试验，对复合地基工程优化设计进行验证，证明了方法的经济性和合理性。
［关键词］ 复合地基 褥垫层 目标应力比 共同作用 优化设计
Optimum Design Method of Composite Foundation Based on Cooperation of Pilesoilcushion System/Li Jinjun1,Shi Sanyuan2,Huang Maosong1(1 Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China； 2 Institute of Architectural Engineering,Hebei Engineering University,Handan 056038,China)
Abstract:Through the theoretical analysis of the pile composite foundations transfering t
he vertical load under cushion, the interaction of the pile soil deformation and the
 thickness of cushion is studied. The relationship of the thickness of cushion and the pile soil stress ratio is got. A new optimum design method of composite foundation is put forward based on the cooperation of pilesoilcushion system in the composite foundation. This method is tested by the single pile soilcement composite foundation loading tests which conducted with the cushions of different thickness. The method is economical and available.
Keywords:composite foundation; cushion; target stress ratio;cooperation; optimum design