Measurements of geotechnical properties of the soil and the mechanical properties of the foundation slab

The measuring sensors were placed in two locations in the floor plan of the house (in the centre and on the edge of the foundation slab) and in two depth levels below the top surface of the floor. Two earth pressure cells type 4800 measuring the total tension of the soil backfill (probes no. 2 and 4) were placed in the depth of -1,45 m under the top floor level (±0,000 m). Two earth pressure cells type 4810 (probes 1 and 3) measuring the contact between the insulation and the concrete foundation slab (Fig. 3.5) were placed in the depth of -0.5 m below the surface of the floor directly under the foundation slab. Two pieces of resistance strain gauges (probes 5 and 6) were placed directly onto the reinforcement of the foundation slab.

Location of the earth pressure cells and resistence strain gauges

Initial measurements were performed before the commencement of the construction of the building. The increase of the pressure in the soil during the construction period is shown in Fig. 3.6 and Fig. 3.7. Stabilisation of the tension in all height levels is already apparent after the completion of the construction. The strain gauges sensors recorded the first increase of relative deformation during hardening of the concrete of the foundation slab and during the construction of loadbearing walls of the building. Further increase of deformation was not observed.

Measurement of total tension in the soil

Measurement of telaitove deformations in the foundation slab