管桩水平承载特性室内模型试验研究

Indoor Model Test on the Bearing Behavior of Pipe Pile under Horizontal Load

目前规范中管桩的水平承载设计仍参考普通灌注桩,设计偏于保守。为了揭示管桩在水平荷载下的承载机理及群桩效率综合系数的安全储备值,进行了室内缩尺模型试验。结果表明:管桩单桩和群桩承载力试验值均大于规范计算结果,得到的群桩效率系数是规范法计算值的1.2~1.5倍。研究成果可为今后水平承载管桩的设计工作提供参考依据。

At present,the design of horizontal bearing pipe pile still takes that of bored pile as reference,resulting in conservative results.In order to reveal the bearing mechanism and obtain the safety reserve value of pile group effect coefficient of pipe pile under horizontal load,we carried out reduced scale model tests.Test results show that：the test values of bearing capacity of single pile and group piles are larger than the calculated results from Technical Code for Building Pile Foundations.The pile group effect coefficients of model test are approximately 1.2 to 1.5 times of the calculated results from Code.The research results are useful for the design of pipe piles under horizontal load.