用函数模型外推法预测抗拔桩极限承载力

Forecast of Extreme Limit of Anti-lifting Pile’s Bearing Capacity by Function Model of Extrapolation

摘要:

在桩的抗拔课题中，极限抗拔承载力的确定是其重要内容。当抗拔试桩未加载至其破坏荷载时，根据已有的荷载位移数据，用函数模型外推法预测极限抗拔承载力具有理论意义和实践意义。以工程实例为基础，用Grapher4的曲线拟合功能，选用双曲线模型、指数模型和幂函数模型，成功预测出了极限抗拔承载力。通过结果比较，表明指数函数模型具有较好的预测精度。

Abstract:

The determination of extreme limit of anti-lifting bearing capacity is an important content for pile’s anti-lifting research. When the load of anti-lifting pile does not reach the disrupt load, the forecast of extreme limit of anti-lifting pile’s bearing capacity by function model of extrapolation is significant in both theory and practice, according to the known load-displacement data. The extreme limit of anti-lifting bearing capacity was successfully forecasted out by hyperbola model, exponent model and power function model, using the imitation functions of curves of Grapher 4 and taking project cases as a base. The comparison of the results of three function models shown that the exponent model has higher forecast precision.