Abstract: 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.

Key words: reservoir shore lines, cable-anchored piles, cable prestresses, load, prestress lose