Retaining Wall Tilting 2

[XinLok]

4 years ago, I made a retaining wall for my own house.
2 years ago, my neighbour did some job with a rig machine to drill a water well close to retaining wall.

At that time, the retaining wall tilt around 2 cm.

Last year I filled with mortar to fill the gap.

on the same photo you will notice around 2 mm tilting again.

But what is surprising me, that there is no any gap between the mortar filled between the retaining wall and the statue base.

If the wall continue tilting, the why there is a gap between retaining wall and Slab, and no any gap existing between retaining wall and foundation base statue?
The foundation base for statue is (3 layers of 2 blocks(20 cm x 40 cm x 20 cm).

Any advise?

 

[phamENG]

There could be several issues. Your best bet is to get with a local structural engineer or testing lab to evaluate the conditions, and probably install crack monitors to track the movement. Measuring re-appearing cracks in patched mortar joints is not always reliable. For instance, proportioning of the mortar and size of the mortar joint could result in internal shrinkage of the mortar, causing a crack to form when the wall didn't move at all.

 

[r13]

Is there reinforcement tying the slab and the wall? It seems the slab has deflected/settled due to consolidation effect, but the upper structures are rigid enough to bridge over the defective area of the slab. You should take a photo to show the complete structure.

 

[XinLok]

I did not tie the slab to the wall.

even in some place, you can find a small gap between the slab and the statue base which will allow a tiny stick to get inside:

See please the full structure:

The height of Retaining wall vary form 1.5 m at the beginning to 4.5 m at the end.

 

[r13]

You definitely have ran into settlement problem, the water well may have fastened the consolidation process. I think you will need to engage a geotechnical engineer to understand the type of onsite soil, and find a way to stabilize the wall and foundation. Under pinning, or grouting may be in the orders. But lucky enough, looks like you do have open land available for carrying out the works.

 

[XinLok]

Is the chance to have a Slab Settlement is higher than retaining wall tilting?
Or do you mean settlement in Slab and settlement in retaining wall?

Thinking about Slab settlement is much better than thinking about retaining wall tilting.

 

[r13]

So far I didn't sense the wall has tilt (lean on one direction), but noticed the gaps sown on the photos. As pointed out before, the wall is much rigid than the base slab, it acted as a continuous bridge across softer/settled locations of the slab. Since the wall and the slab was not connected together by steel reinforcement, so the settlement of the slab has not drag the wall down with it, but given some time, yes, the wall will be affected. Act soon, as the gap has grew larger and deeper, also must be noticeably faster.