考虑剪切刚度系数变化的单桩弹塑性解

以桩侧土和桩端土分别采用弹性–全塑性和双线性硬化荷载传递函数为基础,推导了轴向荷载作用下考虑桩侧极限摩阻力和剪切刚度系数随深度线性变化的单桩弹塑性解析解,得到了荷载-沉降、桩身位移、轴力等计算公式。该方法能更好地反映摩擦桩和端承摩擦桩的荷载传递规律,并可通过试桩资料的反分析,以及结合土工试验和地质勘察资料确定合理的计算参数,计算结果与工程试桩结果间良好的一致性验证了该方法的合理性。

Elastic-plastic solution for axially loaded single pile considering variation of shear stiffness coefficient

Based on elastic-perfectly plastic and bilinear load transfer functions for soil surrounding the pile shaft and under the pile tip respectively,a closed analytical solution was presented for predicting nonlinear response of axially loaded piles,considering that the limited shaft resistance and the shear stiffness coefficient varied linearly with depth.The load and settlement responses,the distribution of displacements,axial load and shaft resistance were obtained,and the performance of load transfer behavior of a single pile was determined.The reasonable model parameters could be determined by the back analysis of single pile loading tests and soil tests.The rationality of the proposed method was proved by the good agreement between the computed results and the measured data of load tests on in situ piles.