自平衡试桩荷载传递模型及荷载–沉降曲线转换方法改进研究  

Load transfer model and improved transition method for load-settlement curve under O-cell pile testing method

作　　者：朱向荣[1] 汪胜忠[1] 叶俊能[2] 王文军[3] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]宁波市轨道交通工程建设指挥部,浙江宁波315012 [3]浙江大学宁波理工学院,浙江宁波315100

出　　处：《岩土工程学报》2010年第11期1717-1721,共5页Chinese Journal of Geotechnical Engineering

摘　　要：通过分析自平衡试桩数据,提出了注浆前后荷载传递函数模型。对自平衡荷载–沉降曲线转换方法中的"精确转换法"进行了改进,考虑了土体连续性对桩顶沉降的影响。通过工程实例验证了模型的合理性,进一步的分析表明:土体连续性对超长桩桩顶沉降影响较大,考虑土体连续性时的极限承载力比不考虑土体连续性时小,改进的方法偏安全。By analyzing the data of O-cell pile testing,new load transfer models before and after post grouting are proposed.The precise conversion method used to load-settlement curve transformation under the O-cell pile testing method is improved,and the influence of continuity of soil on the settlement is considered.The rationality of the proposed models is shown by the practical engineering.Further analysis shows that the the influence of continuity of soil on the settlement of super-long piles is strong,the ultimate bearing capacity with considering the continuity of soil is less than that without,and the improved method is safer.

关 键 词：自平衡试桩 后注浆 荷载传递模型 土体连续性 超长桩 

分 类 号：TU473.1[建筑科学—结构工程]