曲线拟合法预估支盘桩极限承载力的探讨

为探讨曲线拟合法用于挤扩支盘桩单桩极限承载力预估的适应性,将双曲线法、调整双曲线法、二次趋势预测法、指数曲线法及灰色GM(1,1)预测法五种预估方法应用于实际工程的试桩Q-s数据拟合计算中。结果表明,双曲线法计算结果有时偏差较大;指数曲线法、灰色GM(1,1)预测法及调整双曲线法的计算结果较为一致,与实测数据较为吻合且偏于安全,这三种方法具有较好的适应性,可供工程应用参考。

Discuss of Curve Fitting Method for Predicting Ultimate Bearing Capacity of Single Squeezed Branch Pile

To discuss the adaptability of curve fitting method for predicting ultimate bearing capacity of single squeezed branch pile,five kinds of prediction method,which are the hyperbolic method,adjusted hyperbolic method,quadratic trend forecasting method,exponential curve method and GM（1,1）prediction method,were applied to Q-s data-fitting calculations of practical engineering.The results show that the hyperbolic method may result in large deviations,however,the exponential curve method,GM（1,1） prediction method and the adjusted hyperbolic method are consistent with the measured data and indulge in safety.Therefore these three kinds of method has a good adaptability for engineering application.