Abstract:
Designing advanced methods of corrosion protection and increasing the bearing capacity of
pile foundations on saline clayey soils is a priority geotechnical task in Kazakhstan. The formation of
a suffusion-resistant waterproof shell was achieved by silicatization of a borehole before concreting,
by the installation of a mold into the borehole and the impregnation of a sodium silicate solution into
the space between the mold and the soil under pressure. After coagulation of the silicate solution,
the mold was removed and the formed shell was filled with corrosion-resistant concrete. Full-scale
static pile load tests were conducted in the construction site “Retaining wall on Mount Koktobe”
in Almaty. The bearing capacity of the piles with the protective silicate shell exceeded the bearing
capacity of an ordinary pile by 2.5 times on average without wetting the site, and 3.2 times after
prolonged wetting. The numerical model had a close relationship with the average experimental
curve obtained when conducting six static pile load tests with the protective shell. A large economic
effect of the developed piling technology with a protective shell was achieved, with a significant
reduction in the cost of piling, equal to 27.85%.
