In order to popularize the application of root pile (RP), which is a miniaturized application after the simplified construction procedure of root foundation and a promising new type of noncircular section pile, and to verify the bearing capacity and efficiency advantages of RP over traditional straight-shaft pile and pedestal pile (SP and PP, respectively), on the basis of validation of the numerical model, numerical simulation of the three pile types with different lengths and diameters and root sizes was carried out under vertical (including uplift and compressive) and lateral static loading. The results show that both the vertical and lateral bearing capacities and efficiency of RP are higher than those of SP and PP, and the larger the pile length and diameter are, the greater the advantages are. Specifically, compared with the bearing capacity of SP, vertical capacity could be improved greatly only by RP instead of PP when the pile length is no less than 15 m, and not the enlarged base of PP but the roots arranged on the upside of RP could improve lateral capacity. Besides, increasing pile length could not improve lateral capacity when the pile length is no less than 10 m, and both the vertical and lateral bearing capacities could be improved by increasing pile diameter. Two efficiency comparison methods were put forward, and their application condition, advantage and disadvantage were analysed to compare the efficiency of pile length and diameter in improving capacity, according to which the economic way to improve vertical and lateral capacities is to increase pile length and diameter, respectively. Enlarged base of PP and roots of RP could be played more fully when the displacement is large enough; therefore, the difference of capacity and efficiency of the three pile types with failure criterion of small displacement (10 mm lateral and 30 mm vertical displacement) is smaller than that with large displacement (30 mm lateral and 60 mm vertical displacement). Furthermore, in order to facilitate the application of RP, it is suggested that roots length should not exceed 0.5 times of pile diameter, and the height and width should not greater than the spacing between stirrup bars or main steel bar, respectively. In addition, roots annulus spacing of 0.4 ~ 0.5 m is appropriate, and the spacing of root layers should not be less than 2.4 m. On the whole, it is of great significance to popularize root piles in practice.

为了普及根桩（RP）的应用，它是在简化了根基的施工过程和有希望的新型非圆形截面桩之后的小型化应用，并验证了RP相对于传统直桩的承载能力和效率优势竖桩和基桩（分别为SP和PP），在数值模型验证的基础上，对三种长度，直径和根部尺寸不同的桩类型在垂直（包括抗拔和抗压）下进行了数值模拟和横向静载荷。结果表明，RP的竖向和水平承载力和效率均高于SP和PP，且桩长和直径越大，优势就越大。特别，与SP的承载力相比，当桩长不小于15 m时，仅用RP而不是PP可以大大提高竖向承载力，并且不能增大PP的基部，而排列在RP上方的根部可以改善侧向容量。此外，当桩长不小于10 m时，增加桩长并不能提高侧向承载力，而通过增加桩身直径可以同时提高竖向承载力和侧向承载力。提出了两种效率比较方法，分析了它们的应用条件，优缺点，比较了桩长和直径对提高桩身效率的影响，认为提高竖向和横向承载力的经济途径是增加桩长和直径。 ， 分别。当位移足够大时，PP的扩大根基和RP的根可以充分发挥；因此，以小位移（横向位移10毫米和垂直位移30毫米）的破坏准则，三种桩类型的能力和效率差异要比大位移（横向位移30毫米和垂直位移60毫米）的三种桩的能力和效率差异要小。此外，为方便RP的应用，建议根部长度不超过桩直径的0.5倍，高度和宽度分别不大于箍筋或主钢筋之间的间距。另外，根部的环距为0.4〜0.5m为宜，根部的层距应不小于2.4m。总体而言，在实践中普及根桩具有重要意义。