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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。
The failure mode of the reinforced earth retaining wall in the mountainous slopes is that the backfill area has an overall decline along the slope, and the decrease of backfill soil strength will significantly increase the deformation of the retaining wall. Aiming at this failure mode, the micro-pile reinforcement method was developed and the finite element model of the slope retaining wall before and after reinforcement was established. The reliability of the finite element model was verified by numerical simulation of the static load model test. On this basis, the stress-strain characteristics of micro-pile-reinforced earth retaining wall are analyzed based on two important factors, natural slope conditions and backfill soil strength. The results show that the micro-pile reinforcement can effectively prevent the decline of backfill area. According to the condition of natural slope, the displacement of retaining wall can be reduced by 6.25% -46.9% compared with that before consolidation, and the slope friction angle is lower, , And the difference is more significant. According to the different strength of backfill soil, the displacement of retaining wall can be reduced by 6% -56.1%, and the lower the strength of backfill soil, the greater the reduction. Meanwhile, lateral earth pressure and backfill soil The deformation is also significantly reduced. The results can provide guidance for the practical application of micro-pile-reinforced retaining wall in mountainous highway engineering.