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在对模型桩基施加水平振动荷载的同时,施加桩顶竖向荷载,对一根等直径桩和两根承力盘位置不同的支盘桩进行模型对比试验。结果表明:支盘桩与等直径桩相比,其承担水平动荷载的性能更加优越,且支盘桩的承力盘的位置接近桩顶时,这种优越性表现更明显;桩身动弯矩的大小随着水平振动荷载幅值的提高而增大;在水平动荷载数值较小时,竖向荷载的存在能够适当降低桩身弯矩值,对桩的水平动承载性能有利;当桩身水平动荷载数值增大,竖向荷载将会增大桩身弯矩而变为不利因素。
When the horizontal vibration load is applied to the model pile foundation, the vertical load on the pile top is applied to compare the model test of one equivalent diameter pile and two branch pile piles with different bearing positions. The results show that this kind of superiority is more obvious when the bearing capacity of the branch pile is equal to that of the equivalent diameter pile and the load bearing plate of the branch pile is closer to the pile top. The size of moment increases with the increase of horizontal vibration load amplitude; when the horizontal dynamic load value is small, the existence of vertical load can reduce the bending moment of pile, which is beneficial to the horizontal dynamic bearing capacity of pile; Increasing the value of horizontal dynamic load, vertical load will increase the pile bending moment and become a negative factor.