The mechanical properties of hybrid reinforced soil retaining wall were studied by scale model test. The steel sand was adopted as a filler in the model test, which solved similarity ratio of the scaled model. The horizontal displacement of the wall panel, the settlement on the top of the wall, the strain of the fiberglass geogrid and the back earth pressure were studied, and the test results were compared with those of conventional reinforced earth retaining wall. The mechanism of pre-tensioning on prestressed reinforcement of mixed reinforced earth retaining wall was explained. The results show that compared with the conventional reinforced soil retaining wall, the average wall panel horizontal displacement of the hybrid reinforced soil retaining wall reduces by 51.6% when the filling is completed. Under the top load, the average wall panel horizontal displacement increment and the average wall settlement on the top of the hybrid reinforced soil retaining wall are reduced by 89.4% and 73.6%, respectively. The pre-tension on prestressed reinforcement can reduce the strain on the fiberglass geogrid with its adjacent layers.%采用缩尺模型试验研究混合加筋土挡墙的力学性能.以钢砂作为模型填料,探讨缩尺模型试验的相似比问题.对墙面板水平位移、挡墙顶部沉降、玻纤格栅应变和墙背土压力进行研究,并将试验结果与普通加筋土挡墙的测试结果进行对比分析.对混合加筋土挡墙中预应力筋的预拉力作用机理进行解释.研究结果表明:相对于普通加筋土挡墙,填筑完成时混合加筋土挡墙的均墙面板水平位移减小51.6%;在顶部堆载作用下,混合加筋土挡墙的平均墙面板水平位移增量和平均墙顶沉降分别减小89.4%和73.6%;预应力筋的预拉力能减小与其相邻层的玻纤格栅应变.
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