支盘桩试桩极限承载力的二次趋势曲线预估法

Prediction Method for Ultimate Bearing Capacity of Squeezed Branch Pile Based on Quadratic Trend Curve

以二次趋势曲线对挤扩支盘桩单桩静载荷试验Q-S数据进行拟合,利用遗传算法对模型参数进行求解,继而推定单桩极限承载力。结果表明,二次趋势曲线模型拟合出的曲线与实测的曲线比较吻合,预测的结果对工程实际有一定的价值;利用遗传算法求解二次趋势曲线模型具有求解速度快、计算精度高、算法控制参数设置简便、通用性强等优点。

Calculation of squeezed branch pile ultimate bearing capacity by fitting loading test Q-S curves on according to the quadratic trend curve model is discussed. Genetic algorithm program was compiled, and then it was applied to optimize the parameters of quadratic trend curve model. Application shows that quadratic trend curve model is workable. The predicted curve is agree well with the field measurement curve of ultimate load; and the predicted results can be used in practice. The results also make clearly that genetic algorithm has the advantages of high calculation speed, high precision, automatic level, simple settings, high universality and etc.