中文摘要：

预应力锚索是各类永久性岩质边坡最有效的加固手段之一,但其预应力损失使锚索锚固效果难以保证。以一高速公路软岩边坡支护工程为依托,通过现场实测分析,得到锚索预应力的定量损失规律：锚索预应力损失分为瞬时损失和时程损失。前者可达到初始张拉荷载的8%左右;后者又可分为短期和长期损失,其中长期损失的损失量可达到锚索初始张拉荷载的15%左右,该过程约需50 d以上时间完成。分析所得结果为预应力锚索定量补偿张拉和超张拉提供了理论依据,可为同类软岩边坡支护工程提供有益参考。

英文摘要：

Prestressed anchor-cable is one of the most effective means of permanent rock slope reinforcement： but it＇s difficult to guarantee the anchoring effect due to the loss of prestress. This paper is based on some highway soft rock slope support engineering, by field measurement analysis, obtained the quantitative prestress loss law. Prestress loss can be divided into instantaneous loss and time loss. The former, caused by strand retraction, can reach about 8% of the initial tensile load. The latter can be divided into short-term and long-term losses, and can reach about 15% of the initial tensile load. The results not only provides theoretical basis for the prestressed anchor rope tensioning and quantitative compensation tensioning, but also provide useful reference for similar soft rock slope support project.