基于砂箱模型试验的包裹式加筋土挡土墙稳定性影响因素分析

为了减少包裹式加筋土挡土墙的安全冗余，增加工程经济性，在传统包裹式加筋土挡土墙的回折端将满铺拉筋布置为条形拉筋，通过估算及试验研究确定各设计参数的取值，再利用砂箱模型试验分别研究加筋土挡土墙的层数、条形拉筋数量、长度以及布置方式对新型挡土墙的影响。分析结果表明:①层间距决定着挡土墙的破坏类型，层间距过大导致位移超限，层间距小拉筋断裂也不会立即发生坍塌破坏；②层间距还影响着挡土墙的破坏特征，层间距过大挡土墙出现拉筋断裂即坍塌的破坏特征，降低层数后，拉筋断裂也不会立刻坍塌；③回折段条形拉筋长度主要抑制挡土墙的

Analysis on Stability Influence Factors of Packaged Reinforced Earth Retaining Wall Based on Sand Box Model Test

In order to reduce the safety redundancy of the packaged reinforced earth retaining wall, and to increase the engineering economy, strip tie bars were set at the return end of the traditional packaged reinforced earth retaining wall. Through estimation and experimental experience, the values of design parameters were determined, and then the sandbox model test was used to study the effects of the number of layers for the reinforced earth retaining wall, as well as the number, length and arrangement form of strip tie bars on this new type of retaining wall. The analysis results show that:①interlayer spacing determines the failure type of the retaining wall; larger interlayer spacing leads to excessive displacement; when there is smaller interlayer spacing, collapse will not immediately occur if the tie bar breaks; ②interlayer spacing also affects the failure characteristics of the retaining wall; when the interlayer spacing is larger, the retaining wall will immediately collapse if the tie bar breaks; after the number of layers is decreased, the retaining wall will not immediately collapse if the tie bar breaks; ③ length of the strip tie bar at the return section mainly restrains the horizontal deformation of the retaining wall, and its effect on horizontal deformation is stronger than that on the carrying capacity of the retaining wall; ④ arranging strip tie bars with different lengths at the return end is more beneficial to engineering economy, than the arrangement of tie bars with same lengths.