加筋无黏性土斜坡地基承载力模型试验研究

 采用缩尺模型试验研究加筋斜坡地基坡高范围内，不同加筋层数、不同筋带埋深对其极限承载力及破坏形态的影响。通过对比分析试验成果可获得不同加筋层数下最优筋带埋深组合及各试验地基的变形破坏资料。研究表明，在最优筋带埋深组合下，加筋斜坡地基的首层加筋间距随加筋层数的增加有减小趋势，而极限承载力随加筋层数的增加有增加趋势。根据各试验地基的p-s曲线、筋材破坏情况及变形破坏特征，可将不同加筋条件下斜坡地基的破坏形态分为加筋带之上土体破坏、加筋带层间土体破坏、加筋带之下土体破坏3类，并由此获得对应破坏类型的破坏形态图。研究成果对加筋斜坡地基极限承载力变化特性、变形特征及破坏形态的探究具有一定理论参考价值。

LABORATORY MODELLING TEST ON BEARING CAPACITY OF REINFORCED SAND SLOPES

The bearing capacity of the square footings on the reinforced sand slope was studied with the laboratory modelling tests. The effects of the location and the number of the reinforcement layers in the slope on the bearing capacity and the failure mechanism were investigated. The experimental results indicated that there was an optimum location of reinforcement with the highest bearing capacity under the different numbers of reinforcement layers. The optimum depth of the first reinforcement layer decreased，whereas the efficiency of the sand- reinforcement system increased with the increasing of the number of reinforcement layers. According to the characteristics of the load-settlement curves，the deformation and the reinforcement rupture，the failure mechanisms of the reinforced sand slope were classified into three types，the failure above the top layer of reinforcement，the failure between the reinforced layers and the failure below the reinforced zone. Meanwhile，the failure patterns were inferred.