微型桩-加筋土挡墙应力变形特性的多因素分析

发布时间：2018-04-02 21:38

本文选题：加筋土挡墙　切入点：数值模拟　出处：《岩土力学》2017年07期

【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。
[Abstract]:The failure mode of reinforced earth retaining wall in mountain slope is that the backfill area will slide down along the slope, and the decrease of backfill strength will increase the deformation of retaining wall more significantly.In view of this failure mode, the micro-pile reinforcement method is developed, and the finite element model of slope retaining wall before and after reinforcement is established, and the reliability of the finite element model is verified by numerical simulation of static load model test.On this basis, the stress and deformation characteristics of miniature pile-reinforced earth retaining wall are analyzed based on two important factors, natural slope condition and backfill strength.The results show that the reinforcement of micro-pile can effectively restrain the slide of backfill area. According to the different natural slope condition, the displacement of retaining wall can be reduced by 6.25- 46.9 than that before reinforcement, and the lower the friction angle of slope is, the more significant the difference is before reinforcement and after reinforcement.According to the strength of backfill, the displacement of retaining wall can be reduced by 6% or 56.1%, and the lower the backfill strength, the greater the ratio of decrease, and at the same time, the lateral earth pressure and the deformation of backfill are also significantly reduced.The results can provide guidance for the practical application of miniature pile-reinforced earth retaining wall in mountain highway engineering.
【作者单位】：福建省地质工程勘察院国土资源部丘陵山地地质灾害防治重点实验室;河海大学土木与交通学院;重庆大学山地城镇建设与新技术教育部重点实验室;
【基金】：国家自然科学基金(No.51609040) 福建省自然科学基金(No.2016J05112) 福建省科技创新平台建设(No.2014Y2007)~~
【分类号】：TU476.4

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