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为了研究台阶式加筋土挡墙平台宽度对下墙墙体垂直应力大小及分布的影响,进行3组不同平台宽度的台阶式加筋土挡墙室内模型试验。试验结果表明:台阶式加筋土挡墙基底垂直应力随着填土高度的增加而增大,最大值出现在墙面板附近;随着墙间台阶宽度的增加,基底垂直应力沿筋长的分布形式由“V”字形逐渐过渡到倒“S”形;过大的台阶宽度对双级加筋土挡墙基底垂直应力的减载效果不明显;修正的FHWA方法和修正的Gray弹性解方法可较为准确计算基底垂直应力;随着墙顶荷载加载位置距墙面板距离的增加,基底垂直应力逐渐减小;墙顶施加荷载后下墙筋材中后部垂直应力增长较大,而拉筋始端垂直应力变化较小。
In order to study the influence of the platform width of the stepped reinforced earth retaining wall on the vertical stress distribution and the distribution of the wall of the lower wall, three sets of indoor model tests of stepped reinforced earth retaining wall with different platform widths were carried out. The experimental results show that the vertical stress of the stepped reinforced earth retaining wall increases with the increase of filling height, and the maximum value appears near the wall panel. With the increase of the width of the step between the walls, the distribution of the vertical stress of the foundation along the length of the rib The form transition from “V” to “S” shape. The effect of excessive step width on the vertical stress reduction of the two-story reinforced retaining wall is not obvious. The modified FHWA method and the modified Gray The vertical stress of the basement gradually decreases with the increase of the distance from the wall to the top of the wall where the load on the top of the wall increases. The beginning of the vertical tensile stress less change.