【摘要】 为研究抗拔斜桩的承载变形性状及荷载传递机制,在中密干砂中进行10根单斜桩抗拔试验,研究桩身倾角、长径比对斜桩抗拔承载力的影响,分析斜桩桩身轴力、弯矩、剪力及桩侧摩阻力的分布特征,比较斜桩与相应直桩抗拔承载变形性状的差异。结果表明:斜桩的抗拔承载力并不总是大于相应直桩,其大小受到桩身倾角及长径比的重要影响;在上拔荷载作用下,斜桩轴力大于相应直桩轴力,桩身倾角越大,斜桩轴力超过直桩轴力越多;抗拔斜桩桩身上部区段截面存在弯矩及剪力,斜桩最大弯矩受到桩身倾角及长径比的影响,斜桩除了在桩顶处存在最大剪力外,桩顶下一定深度处还存在极值剪力;抗拔斜桩桩身上部为负摩阻力,下部为正摩阻力。更多还原

【Abstract】 In order to reveal the uplift bearing behaviors and load transfer mechanism of vertically loaded batter piles, 10 model tests were conducted for single batter piles embedded in dry medium dense sand. The influence of shaft inclined angle and the ratio of the pile length to shaft diameter(L/D) on the uplift bearing capacity was investigated;and the characteristics of the axial force,the bending moment,the shear force and the average skin friction on pile shaft was analyzed. The difference of the uplift bearing capacity between the batter piles and its vertical counterparts was also studied. Results indicate that the uplift bearing capacity of the batter pile is not always bigger than that of the vertical pile,which notably depends on the shaft inclined angle and the ratio of the L/D. The magnitude of the axial force in batter pile induced by uplift is greater than that in vertical pile,the bigger the inclined angle,the greater the axial force of the batter piles over that of the vertical piles. Both the bending moment and shear force caused by uplifting on the upper segment of batter piles are influenced by the inclined angle and the ratio of L/D. With the exception of a maximum shear force occurring on the pile head for batter pile,an extreme value of shear force will also be caused in the inclined shaft below the pile head. Negative skin friction exists on the upper segment while positive skin friction on the lower segment of the inclined piles.更多还原