肖成志,高珊,李海谦,等.2020.均布荷载下台阶式加筋土挡墙性能的试验分析[J].工程地质学报,28(6):1392-1400.doi: 10.13544/j.cnki.jeg.2019-522.
    引用本文: 肖成志,高珊,李海谦,等.2020.均布荷载下台阶式加筋土挡墙性能的试验分析[J].工程地质学报,28(6):1392-1400.doi: 10.13544/j.cnki.jeg.2019-522.
    Xiao Chengzhi,Gao Shan,Li Haiqian,et al.2020.Experimental study on performance of multi-tiered geogrid reinforced soil retaining wall under uniform static load[J].Journal of Engineering Geology,28(6):1392-1400.doi: 10.13544/j.cnki.jeg.2019-522.
    Citation: Xiao Chengzhi,Gao Shan,Li Haiqian,et al.2020.Experimental study on performance of multi-tiered geogrid reinforced soil retaining wall under uniform static load[J].Journal of Engineering Geology,28(6):1392-1400.doi: 10.13544/j.cnki.jeg.2019-522.

    均布荷载下台阶式加筋土挡墙性能的试验分析

    EXPERIMENTAL STUDY ON PERFORMANCE OF MULTI-TIERED GEO ̄GRID REINFORCED SOIL RETAINING WALL UNDER UNIFORM STATIC LOAD

    • 摘要: 台阶式加筋土挡墙变形与力学特性尚待进一步深入研究。利用模型试验综合分析台阶宽度、上墙筋材长度和筋材层间距对两级台阶式加筋土挡墙性能的影响,试验结果表明:当台阶宽度由1.3H1(H1为下墙高度)减至0.4H1、筋材层间距减小或上墙筋材长度增加时,挡墙顶部沉降明显减少,且墙顶极限承载力显著增加;台阶式加筋土挡墙水平变形受台阶宽度和上墙筋材长度的影响显著,顶部加载时以上墙中部“鼓肚”和下墙沿墙高逐渐增大为主;增加台阶宽度使上墙底部垂直土压力增加,而下墙靠近墙面侧垂直土压力显著减小,增加上墙筋材长度和减少层间距使垂直土压力向远离墙面一侧发展;顶部加载时台阶式加筋土挡墙滑动面始于加载板后缘,绕过上墙墙底承台并贯通于下墙顶部土体,其破坏模式以上墙深层滑动破坏为主。

       

      Abstract: The characteristics of deformation and mechanical performance of multi-tiered geogrid reinforced soil retaining wall(MGRSRW)need to be further analyzed in detail. In this paper, the model tests are carried out to comprehensively investigate the effect of offset distance, reinforcement length of upper wall and reinforcement spacing on the performance of MGRSRW. The experiments results show that reducing the width of offset distance from 1.3H1 to 0.4H1, decreasing the reinforcement spacing or increasing reinforcement length of upper wall, can cause to reduce settlement or settlement ratio on the top of MGRSRW obviously. At the same time, the ultimate bearing capacity of the retaining wall is enhanced significantly. The horizontal deformation of MGRSRW is closely related with offset distance and reinforcement length of upper wall. The distribution of upper wall is tended to be with "drum belly" in the middle of upper wall, and the deformation of lower wall along the wall gradually increases. With the increase of offset distance and decrease of spacing, the vertical earth pressure at the bottom of upper wall increases and the vertical earth pressure near the facing panels of lower wall decreases obviously. Increasing the length of the upper wall reinforcement and reducing the reinforcement spacing can cause to the vertical earth pressure developing away from the wall side. The slip surface of MGRSRW starts at back edge of the loading plate and passes through the bearing pad of toe of upper wall, and then penetrates the soil at the top of the lower wall. The failure mode is dominant in deep sliding failure of the upper wall.

       

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