锚拉桩应用于水库库岸滑坡治理的关键问题探讨

锚拉桩是一种有效的治理滑坡的支挡结构，已广泛用于三峡库区库岸滑坡治理中。分析了锚拉桩应用于水库库岸滑坡治理工程中存在的关键问题。由于水库库岸滑坡作用在锚拉桩上的滑坡推力的变化，应考虑施加在锚索上的预应力 锚索与桩的协调变形，在不改变锚索预应力的情况下，增大锚索变形产生的水平拉力，将减少作用在锚索上的总拉力。通过一算例，分析了过大的预应力作用在锚拉桩上使锚拉桩处于不利工作状态。并分析了锚索上受到的竖向附加荷载，这将恶化锚索的受力，同时，锚拉桩在水位变动带存在三种预应力损失。

A study on some key questions of cable-anchored piles of landslides in reservoir shore lines

The technique of cable-anchored piles is an effective measure in landslide control works, which nowadays has wide application to the fields of infrastructure such as transportation construction projects and geo-hazard control in the reservoir area of Three Gorges Project in China. However the design and calculating method concerned need more attention and urgent studies. Questions are put forward about the cable-anchored piles that have been applied largely in the landslide prevention in the Three Gorges reservoir shore lines. During computing the cable’s prestresses of cable-anchored piles, we consider the changes of horizontal sliding force that act on the anti-slide pile at different conditions and suggest a method for computing the prestressing force. In the method, the cable, anti-slide pile are regarded as a whole. We can increase the cable’s horizontal pull which is formed because of the cable’s deformation but keep the cable’s prestresses constant. By this method ,we can reduce the cable’s pull. The computation results show that excessive prestressing force acting on the anti-slide piles leads the anti-slide pile and the cable to be at a disadvantageous internal force condition. The prestressed anchors will get accessional vertical loads that deteriorate its internal force and three prestress losses exit in the prestressed anchors as the water level is changed.