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为对比研究等截面面积与等截面周长Y形桩与圆形桩的竖向承载性能,基于自主研发的大型桩基模型试验加载系统,通过在桩体内埋设钢筋计,桩端土体内布设土压力盒和砂雨法施工埋设桩体,进行了Y形桩与圆形桩承载机理对比模型试验研究。结果表明:与等截面圆形桩相比,Y形桩极限承载力是圆形桩的1.60倍,桩侧表面积是圆形桩的1.56倍,极限承载力的提高与桩侧表面积增大效果基本一致,在各级荷载作用下圆形桩的端阻力均小于Y形桩的端阻力,异形桩端截面增大了其端阻力;与等周长圆形桩相比,Y形桩极限承载力是圆形桩的84%,但混凝土用量仅为圆形桩的41%,单位体积混凝土发挥的极限承载力为圆形桩的2.04倍,在各级荷载作用下Y形桩总桩侧阻力均大于圆形桩。
In order to comparatively study the vertical bearing capacity of Y-shaped pile and circular pile with constant cross-sectional area and constant cross-sectional area, based on the self-developed large pile foundation model test loading system, by laying the steel bar meter in the pile body, Pressure box and sand and sand construction buried pile, the Y-shaped pile and circular pile bearing mechanism contrast model test research. The results show that the ultimate bearing capacity of Y-shaped piles is 1.60 times that of circular piles and the surface area of pile-shaped piles is 1.56 times larger than that of circular piles with equal cross section. The ultimate bearing capacity and surface area of piles are basically increased The end resistance of the circular pile is less than the end resistance of the Y-shaped pile under the load of all levels, and the cross-section of the special pile increases its end resistance. Compared with the equiaxed circular pile, the ultimate bearing capacity of the Y-shaped pile is a circle Shaped pile 84%, but the amount of concrete is only 41% of the circular pile, the unit volume of concrete to play the ultimate bearing capacity of 2.04 times the circular pile, Y-shaped pile at all levels under the load pile lateral resistance are greater than the round Shaped pile.