黄土边坡框架预应力锚杆支挡结构的设计研究

Design of frame supporting structure with pre-stressed anchor bars on loess slopes

框架预应力锚杆是近年来较好地应用于黄土边坡加固的支挡结构,但其设计理论依据仍不统一,未形成成熟的规范,并且只把锚杆的预应力作为一种安全储备,没有进行具体的计算。基于此,考虑结构与土的相互作用,根据施工过程把设计分为基坑开挖和工作两个阶段,提出了一种侧移控制的设计方法,可以合理地确定施加预应力的大小。应用该方法对某工程实例进行了设计分析,结果表明:合理地确定锚杆预应力的大小是必要的,这对框架预应力锚杆的合理设计具有重要意义。

In recent years, the flame supporting structure with pre-stressed anchor bars has been the better supporting structure used in reinforced loess slopes, however, its design theory is still not uniform and there is no codes to be followed, the pre-stress of anchor bars is only regarded as a safety reserve, and its calculation is ignored. For this, a lateral displacement controled design method, considering the interaction between the structure and the soils, was proposed to ensure the pre-stress reasonably, the design process was divided into excavation and work stages according to the construction. An engineering case was designed and analyzed using the method. The results show that it is necessary to determine the pre-stress of anchor bars, and it is of great significance for the rational design of frame supporting structure with pre-stressed anchor bars.