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? 600～? 750 mm静钻根植桩（SDRP），第二组是 800～? 900 mm静钻根植桩，第三组是? 1 000 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 drill rooted pile (SDRP) is a compound pile consisting of soil-cement and prestressed pipe pile. For the purpose of knowing the deforming performance under lateral load, three sets of amount six piles static tests are carried out. The first set is 600- 750 mm SDRP (pipe pile diameter 600 mm and drilling diameter 750 mm); the second 800- 900 mm SDRP (pipe pile diameter 800 mm and drilling diameter 900 mm); and the third bored piles with diameter 1 000 mm. The second set is of very close in geometry size but different materials with the third set, and the first set is of same materials but different geometry size with the second set. Three findings are carried out after comparing lateral deformation ratios and lateral loads to deformations and deformation gradients, which are firstly bored pile is better than SDRP in the elastic stage but gradually reversed in the subsequent stages, secondly SDRP is stronger at deformation resilience than bored pile, and thirdly pile’s lateral deformation is nearly linear to sectional bending stiffness in the elastic stage. In order to promote lateral load-bearing capacity in elastic stage, the better way was substituting bored pile to SDRP with same diameter but not enlarging SDRP’s diameter.