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通过模型试验研究了竖向荷载作用下砂土中斜桩的荷载传递性状,分析了桩身倾角及长径比对斜桩桩身轴力、弯矩、剪力、桩侧摩阻力及端阻比的影响。试验结果表明:在桩顶竖向荷载作用下,斜桩桩身轴力均小于相应直桩桩身轴力,桩身倾角越大,轴力沿深度衰减得越快,桩长径比越大,轴力沿深度衰减得也越快;斜桩桩身最大弯矩随桩身倾角及长径比的增加而增加,最大弯矩出现的深度与桩身倾角无关,只与长径比相关;不论桩身倾角及长径比的大小,斜桩桩身最大剪力均出现在桩顶截面处,桩身最大剪力随着桩身倾角的增加而增大;桩身倾角越大,斜桩最大摩阻力越大,长径比越大,斜桩最大摩阻力越小,斜桩最大摩阻力出现在桩顶下1/4~1/5桩长处;斜桩端阻比随着桩顶竖向荷载的增加而增大,随着桩身倾角及长径比的增加而减小。
Through the model test, the load transfer characteristics of inclined piles in sandy soil under vertical load were studied. The effects of pile inclination and aspect ratio on the axial force, bending moment, shear force, lateral friction and side resistance Than the impact. The test results show that under axial load, the axial forces of inclined piles are all less than those of corresponding straight piles. The larger the inclination of piles, the faster the axial force attenuates along the depth, and the larger the ratio of pile length to diameter , And the axial force attenuates faster along the depth. The maximum bending moment of inclined piles increases with the increase of pile inclination and aspect ratio. The maximum depth of bending moment has nothing to do with the inclination of piles but only with the aspect ratio. Regardless of the pile body inclination and the aspect ratio, the maximum shear of the inclined pile body occurs at the pile top section, and the maximum shear force of the pile body increases with the increase of the pile body inclination angle. The bigger the maximum frictional resistance is, the larger the aspect ratio is, the smaller the maximal frictional resistance of the inclined pile is. The maximum frictional resistance of the inclined pile appears at the length of 1/4 to 1/5 of the pile under the pile top. It increases with the increase of load and decreases with the increase of pile inclination and aspect ratio.