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目前规范中管桩群桩的水平承载设计是基于单桩试桩结果开展的,没有考虑上部荷载对桩基水平承载能力的影响,这显然不能反映桩基的真实受力状况。本文采用室内缩尺模型试验和数值模拟的方法,对不同竖向荷载下管桩群桩的水平承载性能进行了研究。结果表明:竖向荷载的施加充分发挥了各桩的承载性能,提高了群桩基础的整体性,使得管桩群桩的水平承载力有明显提高,分析得到的群桩效率系数也高于规范的计算值。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 horizontal bearing design of pile group is carried out based on the results of single-pile test pile, and the influence of upper load on the horizontal bearing capacity of pile foundation is not considered, which obviously can not reflect the true bearing condition of pile foundation. In this paper, by means of laboratory scale model test and numerical simulation, the horizontal bearing capacity of pile groups under different vertical loads is studied. The results show that the vertical load exerts the bearing capacity of each pile and improves the integrity of the pile foundation, so that the horizontal bearing capacity of the pile group is obviously improved. The efficiency coefficient of the pile group analyzed is also higher than the standard Calculated value. The research results can provide reference for the future design of horizontal bearing pipe piles.