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静钻根植桩是在水泥土中插入预应力管桩而形成的复合桩。为了认识其在水平荷载作用下的变形性能,实施了3组共6根桩的水平静载试验。第一组是φ600~φ750 mm静钻根植桩(SDRP),第二组是φ800~φ900 mm静钻根植桩,第三组是φ1 000 mm的钻孔灌注桩,第二组与第三组属于几何尺寸十分接近而组成材料不同,第一组与第二组属于组成材料相同而几何尺寸不同。对比水平力-水平位移、水平力-水平位移梯度以及水平变形比后发现,弹性阶段钻孔灌注桩的水平承载性能优于静钻根植桩,而弹性阶段以后则逐渐相反;静钻根植桩变形复原能力强于钻孔灌注桩;桩在弹性阶段的变形量与截面抗弯刚度成近似线性关系;如果只考察弹性阶段,为提高水平承载能力宜将静钻根植桩改为同直径的钻孔灌注桩,不宜单纯扩大静钻根植桩的桩径。
Static drilling rooted pile is a composite pile formed by inserting prestressed pipe pile in cement soil. In order to know its deformation performance under the horizontal load, three sets of 6 static load tests were carried out. The first group is φ600 ~ φ750 mm static drilling rooted pile (SDRP), the second group is φ800 ~ φ900 mm static drilling rooted pile, the third group is φ1 000 mm bored pile, the second group and the third group belong to Geometric dimensions are very close to the composition of different materials, the first group and the second group are composed of the same material and different geometrical dimensions. Comparing horizontal force-horizontal displacement, horizontal force-horizontal displacement gradient and horizontal deformation ratio, it is found that the horizontal bearing capacity of bored piles in elastic stage is better than that of static drilling, while the opposite is true after elastic stage. The capability of pile is stronger than that of bored piles; the deformation of pile in the elastic phase is approximately linear with the bending stiffness of section; if only the elastic phase is considered, in order to improve the horizontal bearing capacity, Pile, should not simply expand the pile diameter of static drilling rooted pile.