中文摘要：

山区斜坡地带加筋土挡墙的破坏模式为回填土区域沿着边坡产生整体下滑，且回填土强度的降低会更显著地增加挡土墙的变形。针对这种破坏模式，开发了微型桩加固方法，建立了加固前、后的斜坡土挡墙有限元模型，并通过对静载模型试验的数值模拟，对有限元模型的可靠性进行了验证。在此基础上，就自然边坡状况和回填土强度这两个重要因素对微型桩-加筋土挡墙的应力变形特性开展分析。结果表明：微型桩的加固能够有效抑制回填土区域的下滑，根据自然边坡状况的不同，挡土墙位移可较加固前减小6．25％~46．9％，且坡面摩擦角越低，加固前、后的差别越显著；根据回填土强度的不同，挡土墙位移可减小6％~56．1％，且回填土强度越低，减小的比例越大；同时，侧向土压力和回填土的变形也显著降低。其结果可为微型桩-加筋土挡墙在山区公路工程中的实际应用提供指导。

英文摘要：

Failure mode of mechanically stabilized earth （MSE） wall in slope areas exhibits as the integral sliding of the backfill region along the slope. Particularly, the reduction of backfill strength obviously exacerbates the deformation of the wall. In this study, a novel micropile reinforcement scheme was proposed to investigate this failure mode. Finite element models of MSE wall of the slope before and after reinforcement were established and further validated by scaled model tests. Based on different natural conditions of the slope and the backfll strength, multivariate analysis was performed numerically to compare the stress and deformation behavior of MSE wall before and after micropile reinforcement. The results indicate that the reinforcement of micropiles can effectively prevent the sliding of backfill region along the slope. The displacements of the wall were decreased by 6.25% to 46.9%, according to different natural conditions of backslope. Moreover, the more obvious decrement was found when the backslope friction angle was lower. Based on different backfill strengths, the displacements were reduced by 6% to 56.1%, and the reduction was greater when the backfill strength was lower. In addition, the earth pressure and deformation of backfill soil declined greatly as well. Therefore, the results can provide an important guidance for the application of micropile-MSE wall in the practical engineering of road construction in mountainous areas.