ЕКСПЕРИМЕНТАЛЬНЕ ОБҐРУНТУВАННЯ ПРОЕКТНИХ РІШЕНЬ ФУНДАМЕНТІВ БАГАТОПОВЕРХОВОЇ БУДІВЛІ В МІСТІ ОДЕСА

Abstract

The article presents the results of slow soil tests with prismatic piles at the construction site of a 20-storey residential building on the B. Arnautskaya 23 Street in Odessa in order to justify the design solutions of pile foundations. According to the results of slow soils tests with two prismatic piles №1 and № 2 their bearing capacity by penetrating to the mark 26.25 made up 1620 kH, and maximum structural design load-1350 kH. According to the results of slow soils tests with two prismatic piles №3, № 4 and № 5 their bearing capacity by penetrating to the mark 26.15 made up 1800 kH., and maximum structural design load-1500 kH. Taking into account the seismic activity with the index keg=0,87 allowable structural design load accordingly made up 1174 kH, and 1305 kH, which exceeded design, equal to 1100 kH. The modulus of deformation of limestone shell stone was clarified by a die block at the well to optimize the calculation of the base for the deformations, since in survey materials for these rocks, information is usually given only on the strength limit for unit single compressive. It has been established that the definitions of the modulus of deformation determined in laboratory conditions differ from the values obtained by a die block in the real-life conditions. In this regard, the modulus of deformation of shell limestone in wells on three horizons was determined. For EGE-9-a-limestone of low strength, it was 119 MPa; for EGE-9b-limestone sawn, low strength, - it was 49 MPa; and for IGE-9v-limestone, low strength, - it was 107 MPa. Geodetic observations of the settlement of the building were carried out from the mark of construction zero and further after the construction of the 4th, 8th, 12th, 16th and 20th floors. According to the obtained results, it was established that the settlement varied from 11 to 22 mm during the entire period of geodetic observations. The average settlement of the building for the period of geodetic observations made up 15 mm.