新型加筋格宾挡土墙性能分析

通过对某高等级公路易失稳段所开发的一种新型加筋格宾挡土墙进行监测及数值分析,研究墙体侧向变形、竖向变形、基底应力及应变增量的分布规律。结果表明:墙体侧向变形总体呈“勺型”分布,墙体中下部变形小,变形主要分布在上部;随着荷载强度的增加,竖向变形也相应增大;基底应力分布不同于一般的柔性基础及刚性基础,总体由墙趾处向墙踵部位呈曲线分布;荷载强度在增加后,影响区域剪应变增量整体向右上方发展,并愈发集中,潜在滑动面位置基本稳定,并大致分布在0.3 H分界线附近;随着荷载强度的增加,水平加筋系统的应变增量明显加大,总体朝着墙后填土方向发展,并随着设置高度的增加而增大;研究成果可为新型加筋格宾挡土墙设计及施工提供参考。

Performance Analysis of the New Reinforced Earth Retaining Wall with Gabion

Through the monitoring and numerical analysis of a new reinforced earth retaining wall developed for the unstable section of a high-grade highway,the distribution of lateral deformation of retaining wall,vertical deformation,basal stress and strain increment are investigated.The results show that the lateral deformation of retaining wall body is generally"spoon-shaped",the deformation of the middle and lower part is small,and the deformations mainly distribute in the upper part.With the increase of load strength,the vertical deformation increases.The stress distribution of the foundation is different from that of general flexible foundation and rigid foundation,and it is curved from the toe to the heel overall.With the increase of load strength,the shear strain increment of the affected area develops to the upper right,and becomes more and more concentrated.The potential sliding surface position is basically stable and approximately distributes near the 0.3 H boundary.At the same time,the strain increment of the horizontal reinforcement system obviously increases,and the trend is towards the filling soil direction behind the retaining wall,and grows with the increase of the setting height.The research results can provide reference for design and construction of the new reinforced earth retaining wall with gabion.