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通过模型试验研究了竖向上拔荷载作用下长径比为30时斜桩的承载变形和荷载传递性状,并与同条件直桩的性状进行了比较。结果表明,在相等桩顶竖向上拔荷载作用下,斜桩竖向上拔量大于直桩竖向上拔量;斜桩桩顶竖向上拔量随桩身倾角的增大而增加。在桩顶竖向上拔荷载作用下,抗拔直桩与抗拔斜桩桩身轴力上拔量分布具有一定的相似性。斜桩桩身弯矩主要分布在1/2桩长范围内,且随着桩身倾角的增大而增大;而最大弯矩所处的深度与桩身倾角无关。抗拔直桩与抗拔斜桩的平均侧摩阻力都是从上部开始发挥并往下传递;随着上拔荷载的增加,桩身上部平均侧摩阻力的数值变化很小,而桩身中下部平均侧摩阻力迅速增长。抗拔直桩与抗拔斜桩端部平均侧摩阻力都表现出弱化现象。
Through the model test, the bearing deformation and load transfer characteristics of inclined piles under the vertical pullout load of 30 were investigated and compared with those of the same condition of straight piles. The results show that under the vertical loading of the equivalent pile top, the pull-out of the inclined pile in the vertical direction is larger than that of the vertical pile. The vertical pull-out of the pile top increases with the increase of pile inclination. Under the vertical loading of the pile top, the pull-out distribution of the anti-pull straight pile and the anti-pull-inclined pile has a certain similarity. The bending moment of inclined pile is mainly distributed in the length of 1/2 pile, and increases with the increase of pile inclination; while the maximum bending moment is not related to the pile inclination. The average lateral friction of both the anti-pull straight pile and the anti-pull-inclined pile is all from the upper part to the lower part. With the increase of pullout load, The lower average lateral friction increases rapidly. Both the anti-pull straight pile and the average lateral side frictional resistance of the anti-pull-inclined pile show a weakening phenomenon.