A house on very weak soils required significant strengthening and increased bearing capacity of the foundation.

The task was to fully support the ground floor and the entrance area with a tiled roof. The floor was built on a foundation slab with a depth of 300 mm below the surface. The technology to solve the problem was limited by the requirement that it should not affect underground utilities, including a storm drain at a depth of 1000 mm and a sewer pipe with a diameter of 225 mm at the same depth. Such requirements necessitated a foundation soil investigation. Five dynamic probing boreholes were drilled. The results of work at a depth of approximately 1200 mm showed that the site should be classified as "problematic" due to a "very loosened foundation" encountered at a depth of 2000 mm; the core samples obtained by hand auger showed silty sand, dark grey, and a groundwater level at 700 mm below ground level.

Six polymer columns were installed under the existing foundations to provide support through the weak foundation layers and to increase the bearing capacity of the supporting soils. The columns were installed approximately 2000 mm below the foundation. Deep Uretek injections were then applied at a depth of 500 mm and then 1000 mm from the ground surface along the sub‑concrete layer to provide uniform support. The average lift was 4 mm, which was necessary to confirm the increased bearing capacity of the foundation. Thus, the house was completely restored. The homeowners were very satisfied with the effect and the timeline of the work.

Result
The result of the work was the cessation of foundation settlement processes, as shown by repeated geomonitoring of the house structures.