完整指数函数拟合单桩荷载-沉降曲线的分析  

Analysis of Fitting Loading-settlement Curves of Single Piles by Integrated Exponential Function

作　　者：赵春风[1,2] 李尚飞[1,2] 鲁嘉 甘爱明[1,2] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《同济大学学报（自然科学版）》2010年第4期486-492,共7页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金资助项目(40972180);上海市重点学科建设资助项目(B308)

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荷载-沉降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.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, an analysis is made of the feature of fitted Loading-settlement curve right by integrated exponential functional model. Then, the paper presents a discussion of the reason of determining ultimate bearing capacity of single piles by the largest curvature point of integrated exponential function. Finally, for no broken single piles in field test, a research is made of the feasibility of predicting ultimate hearing capacity of single piles and its top settlement by the largest curvature point of Loading-settlement curve, conditions of predicting ultimate bearing capacity and limitations of predicting top settlement ofno damaging single piles are obtained.

关 键 词：单桩 竖向静载荷试验 荷载-沉降(Q-S)曲线 完 整指数函数 极限承载力 预测 

分 类 号：TU473[建筑科学—结构工程]