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中文摘要：
基桩负摩阻力的产生过程,实质上是桩周土沉降与桩身之间能量交互传递的过程。对桩周沉降土参与桩身能量传递的研究有助于进一步认识负摩阻力的产生机理,提高计算精度。首先对桩身变形能及所受外力做功进行了讨论并导出理论公式,然后从能量平衡与静力平衡两个角度对桩身单元的应力与应变情况进行分析,列出平衡方程并导出相应的计算公式,接着在考虑地基土的抗剪强度随深度与土性的变化相应呈线性增加的基础上,列出桩身单元能量平衡方程与位移协调方程的矩阵表达式,最后通过将矩阵表达式的联立迭代求解,计算出多层地基土中单桩桩侧摩阻力、桩身轴力及桩身变形。通过计算工程实例并将该计算结果与实测数据的对比分析,得出计算结果与实测数据基本一致、所建程序能够模拟单桩的负摩阻力工作性状的结论。
英文摘要：
The process of producing negative skin friction（NSF） is the energy transformation between the soil mass and piles,and researches on it can help to obtain further understanding of the NSF principles and to promote calculation accuracy.First,the deformation energy of piles as well as the external forces acting on them was discussed,and theoretical formulas were also deduced.Then,from the two aspects of energy balance and static equilibrium,the stress and strain of piles were analyzed,through which equilibriums equations were listed and related formulas were deduced.Next,considering that the shear strength of soil increased linearly with the depth,matrix expressions of energy balance and displacement coordination of pile element were given.Finally,by means of establishing linear simultaneous equation and getting iterative solutions,the NSF on single pile in multiple layer deposits,the axial forces and displacement of piles were calculated.Through programming an engineering example and comparing its results with in-situ data,conclusions were drawn： the calculated results were well agreed with in-situ data and the established program could simulate characters of the NSF on single pile.
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