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为提高桩身变形较大时纵横荷载单桩的设计计算水平,假定地基反力系数沿深度线性增加,考虑土体屈服及纵向荷载的P-Δ效应并计入桩身自重和桩侧摩阻力的影响,得到了地面以下桩身变形和内力的幂级数解。结合已有的地面以上桩身响应的幂级数解,采用Fortran语言编制了计算程序。计算结果表明:桩顶位移、地面处桩身位移及桩身最大弯矩均随纵横向荷载和自由段桩长的增加而增大,并随土体屈服位移的增加而减小;纵向荷载足够大时桩基失稳;桩顶约束条件对桩的响应影响很大。计算值与模型试验的实测值吻合较好,所得解和程序是可靠的。
In order to improve the design and calculation of vertical and horizontal single pile when the deformation of pile body is large, the P-Δ effect of soil yielding and longitudinal load is assumed and the pile self-weight and pile-side frictional resistance The power series solutions of deformation and internal forces of pile body under ground were obtained. Combined with the exponential solution to the existing pile response above the ground, a Fortran programming language was used. The calculation results show that the pile top displacement, the pile body displacement at the ground surface and the maximum bending moment of the pile increase with the increase of the longitudinal and lateral load and the length of the free section, and decrease with the increase of the yield displacement of the soil. The longitudinal load is sufficient The pile foundation is unstable when the pile is large and the pile top constraint has a great influence on the pile response. The calculated values are in good agreement with the measured values of the model test. The obtained solutions and procedures are reliable.