AndreasPlü
2016-04-05 14:58:20
- #1
Hello,
we want to buy a building plot and there are questions upon questions. One concerns the soil condition. The selling municipality had an expert report made with several boreholes in the building area. Two boreholes were made near our plot; the corner was summarized as the "northern region." The result of the boreholes:
Borehole 1 (approx. 5 m from the building site): up to 0.30 m topsoil, then up to 1.70 m clay, silty, stiff, medium brown, then up to 3.50 m clay, silty, weakly organic, stiff, partially soft, medium gray-brown to dark gray-brown, then up to 4.00 m sand, silty, weakly clayey, (stream sand), partially weakly gravelly, moderately loosely deposited, medium brown, then up to at least 4.50 m gravel, sandy, weakly silty, moderately loosely deposited, medium brown. Groundwater 4.37 m.
Borehole 2 (approx. 50 m away) up to 0.30 m topsoil, then up to 0.70 m fill (silt, strongly clayey, weakly gravelly, weakly sandy), stiff, then up to 2.30 m silt, strongly clayey, stiff, gray-brown, then up to 3.80 m clay, silty, weakly organic, stiff, dark gray-brown, then up to at least 4.50 m gravel, sandy, weakly silty, weakly clayey, moderately loosely deposited. No contaminated sites.
Notes on construction in the area of the boreholes: "When building a single-story basement, strongly compressible clay soils of stiff consistency mostly have to be taken into account. Due to the high water content and the distinctly plastic composition, the structural loads should be distributed over large foundation areas in these soils, since the design bearing capacity of the soil should be assumed to be low. Possibly, slab foundations may be economical in this area."
What does this tell me? Does anyone have expertise? Is construction of a single-family house with a basement made more difficult? Are significant additional costs to be expected? Thanks for assessments!
we want to buy a building plot and there are questions upon questions. One concerns the soil condition. The selling municipality had an expert report made with several boreholes in the building area. Two boreholes were made near our plot; the corner was summarized as the "northern region." The result of the boreholes:
Borehole 1 (approx. 5 m from the building site): up to 0.30 m topsoil, then up to 1.70 m clay, silty, stiff, medium brown, then up to 3.50 m clay, silty, weakly organic, stiff, partially soft, medium gray-brown to dark gray-brown, then up to 4.00 m sand, silty, weakly clayey, (stream sand), partially weakly gravelly, moderately loosely deposited, medium brown, then up to at least 4.50 m gravel, sandy, weakly silty, moderately loosely deposited, medium brown. Groundwater 4.37 m.
Borehole 2 (approx. 50 m away) up to 0.30 m topsoil, then up to 0.70 m fill (silt, strongly clayey, weakly gravelly, weakly sandy), stiff, then up to 2.30 m silt, strongly clayey, stiff, gray-brown, then up to 3.80 m clay, silty, weakly organic, stiff, dark gray-brown, then up to at least 4.50 m gravel, sandy, weakly silty, weakly clayey, moderately loosely deposited. No contaminated sites.
Notes on construction in the area of the boreholes: "When building a single-story basement, strongly compressible clay soils of stiff consistency mostly have to be taken into account. Due to the high water content and the distinctly plastic composition, the structural loads should be distributed over large foundation areas in these soils, since the design bearing capacity of the soil should be assumed to be low. Possibly, slab foundations may be economical in this area."
What does this tell me? Does anyone have expertise? Is construction of a single-family house with a basement made more difficult? Are significant additional costs to be expected? Thanks for assessments!