侧限条件下柔性桩复合地基变形分析的能量法

Energy Method of Deformation Analysis for Flexible Pile Composite Foundation with Lateral Restriction

摘要: 为降低软土地基的沉降，提高地基的承载能力，提出了侧向约束复合地基加固技术。同时，基于适当的假设，构造了满足位移边界条件的位移函数。建立了变形影响深度范围内的天然地基和复合地基加固区复合土的总势能方程。基于稳态势能原理，建立了该系统的位移变分方程，提出了侧向约束复合地基变形分析的近似解析方法。FLAC3D数值模拟结果验证了理论分析方法的合理性。

Abstract: To limit the lateral and compression deformation of soft soil within the range of loading, control effectively foundation settlement, a new technology of the flexible pile composite foundation with lateral restraint is suggested, and the energy method for deformation analysis is proposed in this paper. Based on some hypotheses, putting the scope of pile-soil composite reinforcement and the natural foundation of deformation influence depth as a whole, the corresponding displacement component formulae which satisfy the displacement boundary conditions are proposed, then the equation of total potential energy of the system is introduced. Based on the principle of steady- state potential energy, the displacement variational equation of the system is established and an approximate analytical algorithm of the composite foundation deformation with lateral restriction is proposed. The numerical simulation results of FLAC3D verify the rationality of the theoretical analysis method.