黄土边坡框架预应力锚杆支挡结构的理论分析与工程实践

Theoretical Analysis and Engineering Practice of Grillage Supporting Structure with Pre-stressed Anchor Bars on Loess Slope

黄土边坡支挡结构的分析与设计是工程设计的一大难题。作为一种新型支挡结构,框架预应力锚杆支挡结构还没有一种系统的计算方法。文中合理选取了框架预应力锚杆支挡结构的土压力计算模型和框架、锚杆的计算模型,并提出采用力法求解框架和锚杆的内力。另外,推导了结构的基础埋深和稳定性极限平衡分析的计算公式,为框架预应力锚杆支挡结构的设计提供了理论依据。用本文方法设计的多个高边坡经使用证明安全可靠,并具有良好的经济效益。本文提供的方法为黄土边坡支挡结构设计提供了一种新的途径。

Analysis and design of supporting structures on loess slope are very complicated problems. As a new type of supporting structure, there was shortage of a systematic calculation method for the grillage supporting structure with pre-stressed anchor bars. In this paper, the rational calculation models of the soil pressure, the grillage supporting structure and anchor bars were determined, and the force method was proposed to calculate the internal forces of the grillage columns, grillage beams and anchor bars. In addition, the calculation formulas of structural foundation embedded depth and stability limit equilibrium analysis were derived so as to provide theoretical basis for the design of the grillage supporting structure with prestressed anchor bars. This method is proved safe, reliable and economical by having been applied in several engineering cases of the high loess slope.