预应力悬锚式挡土墙受力特性

为了研究不同侧向预应力水平及竖向荷载对预应力悬锚式挡土墙墙背土压力、锚定板板前土压力、墙身剪应力分布特性的影响规律,设计了室内模型试验及数值模型并对悬锚式挡土墙受力特性进行测试与计算分析。研究结果表明:侧向预应力作用下,挡土墙墙背土压力呈抛物线分布并在锚杆处呈现峰值,锚定板板前土压力沿板宽度方向呈“马鞍型”分布并以约35°角向两侧扩展,锚定板板前土压力沿锚索轴向的压缩影响范围约2倍板宽;竖向荷载作用下,挡土墙侧向土压力呈“S”形分布,靠近挡墙底板位置处墙体剪应力急剧增大,应加强该类挡土墙根部配筋设计。结论可为预应力悬锚式挡土墙在公路建设中的推广和应用提供借鉴。

Mechanical performance of prestressed anchor plate retaining wall

In order to study the influence of lateral prestressed force and upload on the distribution of earth pressure on the anchor-plate retaining wall and anchor plate and shear stress of wall, a serial of retaining wall model tests and numerical simulation were put forth. The influence law of the different loads to the mechanical features of anchor-plate retaining wall was found. Results showed that, under prestressed force action, the distribution curve of lateral soil pressure of retaining wall was like a parabolic with the peak value around anchored bar. Earth pressure before anchor plate was a saddle distribution along the width of plate with the expanding degree, 35°. In addition, along the axis of prestressed cable, the influence area of earth pressure of anchor plate was about double width of anchor plate. Under upload action, the distribution curve of lateral earth pressure of retaining wall was like an alphabet S curve. There was a big shear stress area near the rooting of retaining wall, where should be strengthened by increasing ratio of reinforcement. Conclusion of this study could provide reference for the population and application of prestressed anchor plate retaining wall in highway engineering.