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针对微型桩加固滑坡时容易出现侧向变形的缺陷,笔者基于综合排桩刚架结构与拉锚式挡土结构形式优点的研发思路,提出了一种微型桩-锚组合抗滑新结构。利用FLAC3D分析了新结构的变形与受力特性,并与传统刚架式微型桩结构进行了比较。结果表明:相比普通刚架式结构,新结构加固后的边坡位移场和桩顶水平位移明显减小,其加固效果和抗滑能力更优;斜向预应力锚索增强了微型桩的侧向刚度,结构变形曲线相对平缓;桩体弯矩、剪力分布相对均匀,发挥了结构的整体受荷能力,且峰值有所降低;除抗弯和抗剪作用外,微型桩还起到轴向作用,尤其是顺坡桩侧摩阻力作用明显;锚索拉力随边坡变形累积而逐渐增大,可以利用稳定地层的自承能力分担部分滑坡荷载;由于锚索预应力的主动施加,结构对桩后土体起到预加固作用,系梁附近桩侧土压力明显增大。研究结果可为该新结构的设计提供一定理论依据。
Aiming at the defect of lateral deformation when micro-piles are used to reinforce landslide, the author proposed a new type of micro-pile-anchor composite anti-slide structure based on the research and development ideas of combining the advantages of piles-frame structure and anchor-retaining structure. The deformation and force characteristics of the new structure were analyzed by FLAC3D, and compared with the traditional rigid frame micro-pile structure. The results show that compared with ordinary rigid frame structure, the displacement of the slope and the horizontal displacement of the pile top after the new structure are significantly reduced, and the reinforcement effect and anti-skid ability are better. The inclined prestressed anchor cable enhances the micro-pile The lateral stiffness and the deformation curve of the structure are relatively smooth. The distribution of bending moment and shear force of the pile body is relatively uniform and the overall load capacity of the structure is exerted, and the peak value is reduced. In addition to the bending and shearing effects, The axial effect, especially the lateral friction of side slope, plays an obvious role. The tension of anchor cable increases with the deformation of the slope, and the partial load of landslide can be shared by the self-bearing capacity of stable formation. Due to the active application of prestressed anchor cable, The structure plays a pre-reinforcement effect on the post-pile soil, and the earth pressure on the pile side near the tie beam obviously increases. The research results can provide some theoretical basis for the design of this new structure.