顶部条形基础作用下加筋挡墙性能的试验研究

针对加筋挡墙顶部受条形基础载荷作用时的工作性能开展试验研究，分析条形基础距挡墙面板距离对基础极限承载力、加筋挡墙变形特点、筋材应变和破坏模式的影响。试验结果表明：基础极限承载力随基础偏移距离 增加呈现先增大后减小的趋势，且在 为 （ 为挡墙高度）时达到最大值；条形基础加载至破坏前一级载荷时，基础沉降与挡墙高度比值均小于2%，面板水平位移与挡墙高度比值均小于1%，且当 小于0.6时，面板顶部水平位移明显大于中底部；各层筋材中应变最大值随 增加而逐渐向远离面板方向发展，且筋材最大应变由最初出现在顶层而转向中间层；顶部受条形基础载荷作用下加筋挡墙破坏以3种模式为主，即顶层面板挤出的浅层破坏、破坏面沿基础边缘发展并向深部推进和加筋挡墙整体破坏。

Experimental study of performance of geogrid-reinforced retaining wall subjected to load from strip foundation at top surface of wall

On the basis of test studies of performance of geogrid-reinforced retaining walls subjected to load from strip foundation at the top surface of wall, the comprehensive effects of distance between panel and strip foundation on the ultimate bearing capacity, deformation characteristics, reinforcement strains and failure mode of retaining wall were analyzed. The experiment results show that ultimate bearing capacity of strip foundation exhibits a remarkable increase tendency with increase of (D, offset and H, height of retaining wall) before reaching at 0.3, and maximum ultimate bearing capacity can be obtained when 0.3, which is followed by a significant decrease with continuing increase of . Before reinforced retaining walls failing, the ratios of settlement of foundation and height of wall are less than 2%; and the ratios of horizontal deformation of panel and height of wall are less than 1%; moreover, horizontal deformations at the top of walls are significantly greater than the deformation in the middle and at the bottom of walls while is less than 0.6. Additionally, the maximum strains of reinforcement happen to the positions where being away from panel with the increase of ; and the maximum values of strains will occur at the top layer of reinforcement and then shift to the middle layers. Lastly, three main failure modes of retaining walls, shallow failure with blocks at the top of walls squeezed out, failure surface occurring at the verge of foundation developed deeper and global failure of retaining walls, are presented.