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微型桩–加筋土挡墙是一种适用于山区陡坡地带公路工程的新型路基支挡结构,为了初步检验其工作机制和效果,通过模型试验,并结合有限元模拟,对微型桩加固前后的斜坡加筋土挡墙在多级附加荷载下的静力响应进行对比研究。结果表明:数值计算手段能够较好地再现模型试验结果;在2~10 kPa附加荷载下,实测微型桩–加筋土挡墙的沉降比加固前减小11%~40%,面板侧向位移减小50%~66%,且附加荷载越大,减小的比例越大;同时,基底压力和侧向土压力也比加固前明显降低;倾斜桩对挡土墙变形的限制发挥着更为重要的作用,实测2~10 kPa附加荷载导致的倾斜桩身弯矩比竖直桩高出25.9%~40.3%,因而有必要采用较高强度的微型桩作为倾斜方向的加固构件。研究结论初步验证了微型桩–加筋土挡墙的有效性,可为其在实际工程中的应用提供指导。
The micro-pile-reinforced earth retaining wall is a new type of subgrade retaining structure suitable for highway projects in steep slopes in mountainous areas. In order to preliminary test its working mechanism and effect, through the model test and the finite element simulation, The static response of sloped reinforced earth retaining wall under multi-stage additional load is compared. The results show that the numerical calculation method can reproduce the model test results well. Under the additional load of 2 ~ 10 kPa, the settlement of the micro-pile-reinforced retaining wall decreases 11% ~ 40% Decrease by 50% -66%, and the larger the additional load, the greater the reduction. At the same time, the base pressure and lateral earth pressure are also significantly lower than that before reinforcement; the limitation of inclined piles on retaining wall deformation is more Therefore, it is necessary to adopt the micro-pile with higher strength as the reinforcement component in the inclined direction when the additional bending load of 2 ~ 10 kPa is measured. The bending moment of inclined pile is 25.9% ~ 40.3% higher than that of vertical pile. The conclusions of the study have verified the validity of the micro-pile-reinforced earth retaining wall, which can provide guidance for its application in practical engineering.