加筋挡土墙力学特性的模型试验研究

摘要

In this research, the model experiment of reinforced-earth retaining wall was performed to research the complicated friction characteristics and interfacial shear stresses between filled soil and reinforced zone, providing experiment basis and reference for stability calculation and analysis of reinforced-earth retaining wall. Meanwhile, the pull-out model test of the reinforced zone of different lengths was carried out under different overburden pressures and different filled-soil densities. And then through research, the mechanical behavior and deformation pattern of reinforced zone, as well as the friction properties between reinforced zone and filled soil were ascertained. The research result shows that: with the increasing of the overburden pressure, the ultimate pull-out force corresponding to the failure of reinforced zone will increase; the failure mode will change from sliding failure to fracture failure;the friction effect of filled soil on reinforced zone will be enhanced because of consolidation of filled soil. In addition, the expression form of virtual comprehensive friction coefficient considering the effect of bond stress was reasonably determined through the model experiment.%由于加筋挡土墙填土与加筋带之间的摩擦特性和界面剪应力复杂，通过模型试验对其进行研究，可以为加筋挡土墙的稳定性计算分析提供试验依据和参考。在不同上覆压力和填土密度条件下，对不同长度加筋带进行了拉拔模型试验，分析得到了加筋带的受力和变形规律、加筋带与填土之间的摩擦特性。研究表明，随着上覆压力的增大，筋带破坏时的极限拉拔力增加，破坏形式由滑动破坏转变为断裂破坏，填土的固结作用使填土对加筋带的摩阻作用增强，并通过试验合理确定了考虑握裹力影响的综合似摩擦系数的表达形式。