| Summary: | The hydro-geological conditions at the secondary school construction site in the village of Putilkovo, Moscow Region, were underestimated, and the method of soil replacement under- the foundation plates turned out to be inefficient. A brook in the construction zone and a high level of ground waters led to the wash-out of the soil from under the foundation plates at the time of spring floods. The construction works stopped because of the deformation of soil layers under the foundation plates as well as of the danger of the structure fall. The geodetic observations of the foundation settling and the inspection of bearing capacity of monolith structural elements were carried out, and the measures were taken on the strengthening of foundation soils by the grout injection method with the arrangement of soil-and-cement columns. The monolith basement structures were strengthened as well. The under-estimation of hydro-geological conditions at the design stage led to incorrect design solutions. The construction outage, the development of new design solutions and the introduction of these design solutions led to the increase in the project cost and a longer construction period.
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