Earthworks, soil survey: how much soil needs to be removed?

2023-02-05 15:10:38

Hello,

we need help reading the soil report. We want to build a single-family house with a concrete slab. Our earthworks contractor wants to know how much soil needs to be replaced / compacted, and we cannot make sense of the soil report. I hope someone knowledgeable can help us. The soil situation is shown in the pictures.
What is meant by soil / bedding cushion?
What should go under the gravel / the clean layer and how deep should that be?

[ATTACH width="443px" alt="IMG_20230205_140838.jpg" type="full"]78020[/ATTACH]
[ATTACH width="444px" alt="IMG_20230205_144620.jpg" type="full"]78021[/ATTACH]

2023-02-05 19:13:47

Give the civil engineer the soil report, he needs to be able to read it. Don't you have a site manager? He has to coordinate that!

2023-02-05 19:26:43

Thank you very much for the response! Unfortunately, the earthworks contractor cannot make sense of the soil survey, so here is my question. Unfortunately, the construction manager could not tell us anything about it either; he also does not coordinate the earthworks contractor, so it all falls on us. It would be helpful if we knew how much soil is to be removed. Here is another picture showing the replacement soil and the earth. In my opinion, it is only replacement soil from +9.27m to +9.50m, so only about 23 cm of soil is to be replaced, is that correct?

2023-02-05 19:29:34

Sorry, but you are even less of an expert than the earthworks contractor. Then involve the soil expert again and have it translated into "plain German" or into an instruction for the earthworks contractor.

2023-02-05 19:31:01

Alright, we will do it that way!

2023-02-05 19:58:44

Actually, this is also quite clearly stated in the founding recommendation normally.
So what is cut off in the screenshot for you. For example, mine says:

Humic and filled loose rocks, including construction debris, must be removed from the foundation area and replaced with a foundation cushion made of sands.
A dismantling must be carried out up to the top of the natural soil.
Such a foundation cushion must be built and compacted in layers. For each layer, 97 to 100% Proctor density must be demonstrated. Before installing the cushion, the natural soil and the base of strip foundations must also be compacted again.
According to the probe results, in the sounding area, removal of 0.5 to 1.0 m of filled, humic displaced material is to be expected. In some spots, a greater thickness is also possible.

That means it should be replaced down to the sands present with me. That was 50-100 cm for me. Since you cannot replace at an angle, 100 cm.

I would assume the same for you according to the last sketch, since the lens with the glacial clay probably is not load-bearing.

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Earthworks, soil survey: how much soil needs to be removed?

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