桩靴在静载荷作用下的沉降预测

Prediction of pile shoe settlement under static loading test

为了研究桩靴在静载荷作用下的沉降,基于圆孔扩张理论,推导出桩靴在荷载作用下的桩端阻力表达式。将桩端阻力作为桩靴受压状态下的荷载传递函数,结合桩侧摩阻力函数,采用分段位移迭代算法进行计算,预测出桩靴在受压状态下的荷载—沉降曲线。开展砂土中的桩靴静载模型试验,将模型试验结果与理论结果进行对比验证。结果表明:推导的理论公式计算结果与试验结果基本一致,该理论公式准确性较高,可为相关工程提供参考。

In order to study the settlement of the pile shoe under static load, based on the circular hole expansion theory, the pile end resistance under the load was derived, and then the derived pile end resistance was used as the load transfer function of the pile shoe under compression. Combined with the resistance function of the pile shaft, an iterative algorithm of piecewise displacement was carried out to predict the load-settlement curve of the pile shoe under compression. Static load test of the pile shoe in sand strata was carried out, and verified by comparing with the theoretical results. The results show that the calculation results derived from the theoretical formula are largely consistent with the experimental results, so the theoretical formula is accurate. It could provide a reference for the similar projects.