Fig. 1 - Scope of research works for a single-family house - 4 research holes in the corners of the designed building and 2 probing.
As part of the research for a single-family house, we make 4 or 3 research holes to the depth of 4. 5 m.
In order to determine the soil strength parameters, we additionally perform 2 dynamic probing DPL or ITB-ZW.
During the research works, soil samples for further laboratory survey are taken, a macroscopic description of the drilled ground layers and groundwater level observations are also conducted. After completion of the works, the geologist supervising the geologist performs the elevation leveling of research points. On the basis of the obtained research, a geotechnical opinion is prepared.
In the case of basement buildings, a deeper reconnaissance is carried out depending on the designed level of foundation. In the case of weak-bearing soils, such as peat, it is necessary to perform a deeper reconnaissance to the depth of min. 3m below the level of occurrence of bearing soils.
We do not recommend to drill less than 3 boreholes, because it is the minimum system allowing to prepare more geotechnical sections, and thus allows to interpret the layers under the whole designed building.
REMEMBER! Savings in geotechnical research can lead to problems at the stage of construction and exploitation of the building. Repair of cracks or groundwater inflow will cost repeatedly more than making a correct diagnosis, which will allow us to predict the above mentioned prpoblemy at the stage of preparing the construction project.