基于应变增量迭代的单桩分析方法

结合单桩荷载传递模型基本假定,提出一种计算分层土中竖向受荷单桩桩身变形和内力的迭代算法.该算法在假定桩顶沉降的前提下,通过对桩身应变和桩周土弹簧反力积分,求得桩身各部位的变形、内力及应变,并以桩身应变增量收敛控制迭代过程,进而得到桩身摩阻力和端阻力分布及相应的桩顶竖向荷载.算例分析表明,该算法对多种类型荷载传递函数具有良好的适应性,计算值与实测值和其他方法的计算值具有较好的一致性.

Single Pile Analysis Based on Strain Increment Iteration

Combined with the basic assumption of load transferring method, an iterative algorithm was established for analyzing the deformation and axial force of pile shaft in layered soil. Given the settlement of pile top, the displacement, axial force and strain of pile shaft could be obtained through integrating the strain of pile shaft and the spring force of soil around pile. The procedure for iteration was dominated by the strain increment convergence of pile shaft. Then the pile side friction resistance, pile tip resistance and load on pile top were also obtained. A case study indicates that the proposed method has good adaptability with various load transferring functions and is generally in good agreement with the field observed values and calculated results from other approaches.