单一桩型复合地基沉降计算与参数取值探讨

基于沉降控制设计要求，从变形模式出发，分析了单一桩型复合地基桩间土受力机理，提出了相应沉降计算公式，并探讨了相关计算参数的确定方法。结果表明，考虑桩．土．垫层之间的相互作用计算沉降，理论依据较强，也便于分析不同地质和桩长条件下各部分沉降的比例，有利于控制沉降；地质勘察时，宜根据沉降计算的需要，提供地基土的e～p曲线和持力层的基床系数，并提供桩、土直剪摩擦试验结果。

Study on the Settlement Calculation and Parameters Determination of Single Pile Composite Foundation

Based on the settlement-control design and the deformation model of single kind pile composite foundation,the working mechanism of inter-pile soil was analysed,its settlement calculation formulas were presented,and the determination method of interrelated calculation parameters was also discussed.The results show that the calculation formulas considering the interaction of pile-soil-cushion have obvious theoretical character,convenience analyzing the settlement ratio of some region on the different geology and pile-length condition,and benefit controlling settlement.The engineering geological exploration document should provide the e-p curves of soil,the subgrade coefficient of bearing stratum and the results of direct shear test between the pile and the soil according to the request of settlement calculation.