I am working on a project and implementing lots of permenant anchors to avoid any potential landslide. Actually material where the anchor bonds were implemented is not that very bad but, a landslide governed previously on that surface.
In any case, we implemented lots of anchors with load cells and we are following the behaviour of anchors by time. We tested the all anchors up to proof loads and locked according to design loads. Anyhow, in some anchors, load started to be increased and in some of them is started to lose. Actually i can understand that anchor can lose the load due to movement of anchor head and etc. But increasing load can note that some movement is going on the slope.
For now %90 of anchors are following the normal case. But i need to find some documents to if this situation can be acceptable.