Retention wall/slope stabily - critical point evaluation

[Stefejan]

Hi people,
This is the first post on the forum, hopefully I'm in the right place.
I'd have a question regarding the stability of a slope + retention wall system.

Basically there's a cantilever wall built on the upper part of a slope. This was built decades ago on a not optimally consolidated ground, and since then it's constantly moving.
In the last 10 years there are periodical surveys to control the movements, of which I have the data.
Question is:
How can I approach the problem, to determine what's approximately the critical point of movement, after which the whole thing could collapse?

Just a few points for the context:
-The wall composed of 6 disjointed blocks which move in different ways.
-Structurally they are ok.
In some parts the wall seems to slide together with the ground. In other parts it seems to rotate on itself.
-To this date the total movement is about 30cm or something like that, it doesn't accelerate in time. Linear regression can be probably used to determine more or less the evolution of the thing.

 

[Tomfh]

Got any photos?

 

[EireChch]

Trying to predict when a wall will fail is a trick, dangerous game. Just do an assessment and define it as either stable or unstable.

What happens if you try to make a prediction on what level of movement will trigger failure, but the wall fails at significantly less movement?? youre sticking your neck on the line for very little gain

 

[XR250]

Nobody will have any idea of what you are describing without pictures

 

[Stefejan]

Excuse guys, I've seen now the notification. I'll provide Fotos tomorrow.
Just a note: it's not properly a cantilever, it's wall composed of massive blocks, where you can walk inside, like 4m wide and 8m tall.
Anyways, I've analyzed better the geometric datapoints and the behavior of the wall. The movement is kinda weird. Basically:
Until 2014 the horizontal and vertical movement was linear, 2mm / year on average from the construction. I don't have data, just assuming zero movement at the construction and taking the total displacement measured at the first survey.
From 2014 to 2020 i have data points that confirm this 2mm/year in direction valley and 1mm/year vertical movement. The movements are differential, since the geology is different along the wall.
In 2020 there was the beginning of a massive construction site and all the blocks accelerated their movements.
But here's the catch.
After 2020, when the effects of the site have stabilized, The blocks near the construction site begun to slide in direction hill, the ones away from there, despite always moving to valley were decelerated.
Now I'm in a situation where the horizontal movement away from the site is like 0.5 mm/year to valley, and the one near the site more or less stable.
Vertical movement near the site is also stable, away from there has just strongly decelerated.
No rotations overall.

Before deciding what to do, I think would be necessary to understand the weird impact that the construction site had on that wall.
Can someone give a theoric explanation on that regard? I mean, in which cases can a wall slide against the hill, if the upper ground is more loaded?
I think misurations errors are not the case, because the trend is clear over the years