中文摘要：

以某实际工程桩为原型,考虑坡度和桩长的影响,根据相似理论设计并完成了竖向荷载作用下斜坡段桥梁基桩室内模型试验,获得了不同坡度及不同桩长下基桩的荷载-位移曲线、桩身轴力与桩侧摩阻力沿深度的分布规律以及基桩极限承载力,据此通过非线性拟合,建立了斜坡桥梁基桩竖向承载折减系数与桩长及坡度直接的关系式。试验研究表明：竖向荷载相同时,桩顶沉降与水平位移均随坡度及桩长的增加而增大,基桩的荷载-位移曲线均无明显拐点,并呈现出因变形过大导致基桩屈曲失稳的破坏模式;斜坡效应对基桩竖向承载的影响约限于8倍桩径深度范围内;与平地桩相比,斜坡桩的桩侧摩阻力更易达到极限值,实际工程设计时应对其进行适当折减;边坡坡度越大、自由段越长,基桩竖向承载力越小。

英文摘要：

Taking a practical engineering pile as the prototype, the indoor model test of bridge foundation piles in slope under vertical loads is conducted based on the similarity theory considering the effect of slope gradient and pile length, the load-displacement curve, the distributions of pile axial force and side friction along the depth, the ultimate bearing capacity of the foundation pile with different slope gradients and pile lengths are obtained. Based on this and the nonlinear fitting, the relationship of the vertical bearing reduction coefficient of bridge foundation piles on slope with pile length and slope gradient are established. The test result shows that （ 1 ） under the same conditions of vertical load, the settlement and horizontal displacement of pile top increase as slope gradient and pile length increasing, the inflection point of the load-displacement curve is not clear, and the buckling failure of the piles is occurred due to the excessive deformation of the pile; （2） the influence depth of slope effect on vertical beating capacity of the foundation pile is limited about 8 times of pile diameter; （3） compared with the slope is more easily to reach the ultimate value, so pile in flat ground, the friction resistance of the pile in the friction resistance of the pile should be properly reduced in practical engineering design; （4） both the greater the slope gradient and the free section of pile length, the smaller the vertical bearing capacity of the foundation pile.