完整指数函数拟合单桩Q-S曲线的分析

Analysis of Fitting Q-S Curves of Single Piles by Integrated Exponential Function

摘要:

不同于以往确定完整指数函数参数的方法，提出了确定完整指数函数参数的差分形式最小二乘法；然后结合现场试验，对完整指数函数拟合Q-S曲线的规律进行分析，探讨用指数函数最大曲率点判定桩的极限承载力及其相应沉降的合理性；最后针对未加载至破坏的单桩竖向静载荷试验，研究用完整指数函数预测竖向荷载作用下单桩的极限承载力及其相应桩顶沉降的可行性，提出了预测单桩极限承载力的条件和预测单桩破坏时桩顶沉降的合理性和局限性。

Abstract:

Different from Previous solution，Least Square Model Solution of difference form of integrated exponential functional model is put forward to determine Parameters of integrated exponential function. Combining with field test, analyze the feature of fitted Q-S curve right by integrated exponential functional model. Then, discuss the reason of determining ultimate bearing capacity of single piles by the largest Curvature point of integrated exponential function. Last, For no broken single piles in field test，researched the feasibility of predicting ultimate bearing capacity of single piles and its top settlement by the largest Curvature point of Q-S curve，obtained conditions of predicting ultimate bearing capacity and limitations of predicting top settlement of no damaging single piles.