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利用自行开发的大型土工试验模型槽,进行了等截面积X形桩和圆形桩抗拔性能对比试验研究,比较了二者轴力、桩侧摩阻力及位移的分布和变化规律。X形桩相比圆截面桩侧表面积增加了31.5%,试验结果表明,二者桩侧摩阻力分布规律相同,沿桩长可分为提高区域、衰退区域;摩阻力发挥充分的区域在埋深1.50～3.00m,此区域中X形桩摩阻力的最小值和峰值都较圆形桩大,相同的桩头位移下X形桩的侧摩阻远大于圆形桩,其极限抗拔力高出圆形桩约16.7%。
The experimental study on the pull-out performance of X-shaped piles and circular piles with equivalent cross-sectional area was carried out by using the large-scale soil test tank developed by ourselves. The distribution and variation of axial force, friction and displacement of pile side were compared. The results show that the frictional resistance distribution of the pile is the same, and the pile length can be divided into increasing area and declining area. The area with sufficient frictional resistance is buried deep 1.50 ~ 3.00m, the minimum and peak friction resistance of X-shaped piles in this area are larger than that of circular piles. The lateral friction of X-shaped piles under the same pile head displacement is much larger than that of round piles, and the ultimate pull-out force Round piles of about 16.7%.