考虑桩侧土软化时单桩荷载—沉降关系的解析算法

Analytical method of load-settlement relation on single pile under pile-side softening

桩周土选用三折线软化模型 ,桩端土选用双折线硬化模型 ,在此基础上导出了桩身截面轴力随深度变化及桩顶荷载—沉降关系的解析算式 ,并由此分析了桩周土和桩底土性状对桩身截面轴力及 P0 - S0 关系曲线的影响。通过对株洲地区试桩进行理论拟合得到了所需的计算参数 ,然后对邻近试桩进行计算对比 ,计算值与实测值相当接近 。

With tri linear softening model to pile side soil and bilinear hardening model to pile end soil, a set of analytical equations for variation of the axial force along depth and the pile top load settlement curve are established and influences of the pile side and pile end soil behaviour on the axial force and P 0 S 0 curve are discussed. The calculating parameters are obtained by theoretically approaching to actual measure load settlement curve at Zhuzhou area, then calculating contrast to neighboring pile is carried by the method in this paper, the results are satisfactory. So the paper will be of practical significance in design of pile foundation.