基桩承载力反向自平衡试桩法模型试验研究  

Research on Model Test of Reverse Self-Balanced Pile Testing Method for Pile Bearing Capacity

作　　者：李永[1,2] 刘志杰 刘永莉 Li Yong;Liu Zhijie;Liu Yongli(CCCC First Harbor Consultants Co.,Ltd.,Tianjin,300220,China;Tianjin Municipal Key laboratory of Geotechnical and Structure of Coast and Offshore Engineering,Tianjin 300222,China;School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan Hubei,430068,China)

机构地区：[1]中交第一航务工程勘察设计院有限公司,天津300220 [2]天津市海岸与近海工程岩土与结构重点实验室,天津300222 [3]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《港口航道与近海工程》2024年第4期36-43,共8页Port,Waterway and Offshore Engineering

基　　金：国家自然科学基金项目:溶洞特征对地基破坏模式及基桩承载力的作用机理研究(51608181)。

摘　　要：针对反向自平衡试桩法在工程实践中可能存在的问题,应用室内模型试验对该方法的可操作性进行研究。首先,设计并浇筑完成了反向自平衡试桩法模型试验装置;其次,分别进行桩身加载和桩顶加载试验,得到试验数据;最后,将试验结果和经验公式法计算结果进行对比分析。研究结果表明:反向自平衡试桩法荷载箱位置难以同时满足两次加载所需平衡力的要求,且结果还受加载顺序和上下段桩之间预留间距影响,还需对最优加载顺序确定、荷载补偿、上下段桩间预留距离确定等问题进行研究。As for the application of reverse self-balanced pile testing method in engineering practice,the feasibility of this method is studied through indoor model test.Firstly,the model test device was designed and poured.Secondly,the test data were obtained by conducting the loading tests of pile body and top respectively.Finally,the test results were compared with the calculation result by using the empirical formula method.The research results show that the position of load box cannot provide enough balance force required by two loading at the same time based on the reverse self-balance pile testing method.The results are also affected by the loading sequence and the reserved spacing between the upper and lower piles.In addition,A series of researches must be conducted,which covers the determination of the optimal loading sequence,load compensation,and the determination of the reserved distance between the upper and lower piles.

关 键 词：基桩 经验公式法 自平衡试桩法 反向自平衡试桩法 模型试验装置 Q-S曲线 

分 类 号：TU473.16[建筑科学—结构工程]