根式基础极限承载力预测的修正双曲线法  

Prediction of ultimate bearing capacity of rooted foundation by modified hyperbolic method

作　　者：沈浩浩 罗晓光 余竹 SHEN Haohao;LUO Xiaoguang;YU Zhu(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Transportation Holding Group Co.,Ltd.,Hefei 230088,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]安徽省交通控股集团有限公司,安徽合肥230088

出　　处：《合肥工业大学学报（自然科学版）》2022年第4期520-525,共6页Journal of Hefei University of Technology：Natural Science

基　　金：合肥工业大学产学研校企合作资助项目(W2019JSKF0386)。

摘　　要：为了研究根式基础的承载性能和预测其极限承载力,在传统桩基础的双曲线模型基础上,文章提出适用于根式基础承载力预测的修正双曲线模型,对实际工程中根式基础的实测荷载-沉降曲线进行拟合以及极限承载力预测,并与传统的双曲线模型、完整指数模型及实测结果进行比较分析。结果表明:修正后的双曲线模型对根桩荷载-沉降曲线拟合精度更高,平均相关系数达0.9985,特别是曲线尾部(非线性阶段)与实测结果吻合更好,可用来预测根式基础的极限承载力;根键的存在大大提高了根式基础的竖向极限承载力,受到现场试桩条件的限制,现场实测承载力小于其真实极限承载力,具有较高的安全储备。In order to study the load-bearing properties of rooted foundation and predict its ultimate bearing capacity,a modified hyperbolic model was proposed based on the hyperbolic model of traditional pile foundation.This model was used to fit the actual measured load-settlement curve of rooted foundation and predict its ultimate bearing capacity.The results of the modified hyperbolic model were compared with those of the traditional hyperbolic model,the complete exponential model and the measured data.The results show that the modified hyperbolic model has a higher fitting accuracy for the load-settlement curve of rooted foundation,and the average correlation coefficient was 0.9985.In particular,the tail of the curve(nonlinear stage)is in better agreement with the measured results,which can be used to predict the ultimate bearing capacity of rooted foundation.The predictions show that the existence of roots greatly improves the vertical ultimate bearing capacity of rooted foundation.Due to the limited conditions of pile test in the field,the actual bearing capacity in the field is less than its real ultimate bearing capacity,which shows that rooted foundations have a high safety reserve.

关 键 词：根式基础 荷载-沉降曲线 修正双曲线模型 曲线拟合 极限承载力 

分 类 号：TU473.11[建筑科学—结构工程]