条形荷载下三明治形加筋土挡墙模型试验

Model Test of Sandwich Reinforced Retaining Wall under Strip Load

为研究一种新型挡墙结构——三明治形加筋土挡墙的受力变形特性,采用室内模型试验对比分析了条形荷载作用下三明治形加筋土挡墙与砂土加筋土挡墙的面板水平位移、挡墙沉降、水平土压力、竖向土压力的规律。结果表明:三明治形加筋土挡墙与砂土加筋土挡墙的变形与受力规律相似且差值不大;三明治形加筋土挡墙面板后水平土压力沿着挡墙高度的增加逐渐减小;填筑阶段时,三明治形加筋土挡墙筋材处的竖向土压力沿水平方向呈非线性分布,最大值发生在筋材中后部;加载阶段时,随着距面板的距离增大,筋材处竖向土压力先增大后减小。三明治形加筋土挡墙与砂土加筋土挡墙的变形与受力规律相似,两者性能较为接近。由于三明治形加筋土挡墙的成本较低,在实际工程中是一种较好的替代结构。

To study the deformation characteristics of sandwich reinforced retaining wall,the variation of panel displacement,vertical settlement,horizontal earth pressure,vertical earth pressure,and ultimate bearing capacity of the sandwich reinforced retaining(SWRR)wall and sand reinforced retaining(SRR)wall under strip load were analyzed in model test.Results show that the distributions of deformation and stress of SWRR wall are similar to that of SRR wall with sand as filler.The horizontal earth pressure decreased linearly with the increase of the height of panel.In the filling stage,the distribution of the vertical earth pressure at the reinforcement was non-linear along the horizontal direction,and the maximum value was at the middle and rear end of the reinforcement.In the loading stage,with the distance from the panel increasing,the vertical earth pressure of the reinforcement increased first and then decreased.The deformation and mechanical behavior of SWRR wall was similar to that of SRR wall,and similar too in the performance.As the cost of sandwich reinforced soil retaining wall is less expansive,SWRR wall is a good alternative structure in engineering practice.