lisaa11
2019-12-03 14:28:53
- #1
It concerns a new construction in a gap between buildings; the surrounding neighborhood consists of 1970s houses with basements, none of which had pile foundations or similar. Now the soil expert of the house building company (developer) has completed his assignment and presents the following results.
According to the soil report:
During the soil investigation, between 0.90 - 2.80 m below ground level (GOK), a highly organic layer of floodplain clay and mud with very low load-bearing capacity was encountered. Due to these settlement-sensitive soils, additional measures (such as pile foundations with drilled piles or deep foundations using concrete shaft rings) are required for the foundation.
Groundwater / stratified water: Water level at: 2.70 - 2.80 m below GOK, measured after drilling ended at: 1.60 - 1.70 m below GOK (confined), stratified water in sandy and gravelly areas possible depending on precipitation development.
Groundwater level: 0.40 m below GOK [-0.78 m rel.]
Perched water: After heavy rainfall events, complete pore water saturation (water saturation in the soil pore space) up to ground level (GOK) possible (puddle formation).
Soil profile:
1. up to 0.30 m below GOK Topsoil sand, silty - weakly silty, slightly humic
Consistency / structure: loose, partly medium dense Color: dark brown - brown grey - dark grey - brown
2. up to 0.90 - 1.00 m below GOK Cover sediments sand, strongly silty - silty
3. up to 2.70 - 2.80 m below GOK Floodplain clay/mud silt, sandy - weakly sandy, weakly clayey, organic -
General characteristics: layers 2 and 3 highly organic (decomposed wood and plant remains, musty odor)
4. up to 5.00 m below GOK Fluviatile sediments sand, weakly silty, weakly gravelly, in KRB 1 from 4.60
General characteristics: m: sand, strongly silty
Question: Pile foundation would not only be expensive for us but also much more complex due to pressure probing (15 m to 20 m), aerial photo verification of absence of utilities and unexploded ordnance, preservation of evidence, etc. Is there an alternative solution here?
Thank you very much in advance!
According to the soil report:
During the soil investigation, between 0.90 - 2.80 m below ground level (GOK), a highly organic layer of floodplain clay and mud with very low load-bearing capacity was encountered. Due to these settlement-sensitive soils, additional measures (such as pile foundations with drilled piles or deep foundations using concrete shaft rings) are required for the foundation.
Groundwater / stratified water: Water level at: 2.70 - 2.80 m below GOK, measured after drilling ended at: 1.60 - 1.70 m below GOK (confined), stratified water in sandy and gravelly areas possible depending on precipitation development.
Groundwater level: 0.40 m below GOK [-0.78 m rel.]
Perched water: After heavy rainfall events, complete pore water saturation (water saturation in the soil pore space) up to ground level (GOK) possible (puddle formation).
Soil profile:
1. up to 0.30 m below GOK Topsoil sand, silty - weakly silty, slightly humic
Consistency / structure: loose, partly medium dense Color: dark brown - brown grey - dark grey - brown
2. up to 0.90 - 1.00 m below GOK Cover sediments sand, strongly silty - silty
3. up to 2.70 - 2.80 m below GOK Floodplain clay/mud silt, sandy - weakly sandy, weakly clayey, organic -
General characteristics: layers 2 and 3 highly organic (decomposed wood and plant remains, musty odor)
4. up to 5.00 m below GOK Fluviatile sediments sand, weakly silty, weakly gravelly, in KRB 1 from 4.60
General characteristics: m: sand, strongly silty
Question: Pile foundation would not only be expensive for us but also much more complex due to pressure probing (15 m to 20 m), aerial photo verification of absence of utilities and unexploded ordnance, preservation of evidence, etc. Is there an alternative solution here?
Thank you very much in advance!