Abstract
Object. To find out the nature of stress-strain state of strip foundations reinforced by drilling mixing technology by means of experimental studies in a tray and in field conditions, for the reliability of the obtained results, comparing field studies with finite element method (FEM) modeling. Method. Tray tests were carried out in a metal tray with a steel stamp. Unreinforced clay soil bases and bases reinforced by soil-cement were tested with varying values of the reinforcement coefficient from 2,1 % to 7,1 % with a reinforcement depth of 100 mm and a diameter of 5 mm. Observations of settlements of the natural object were carried out by the method of geometric leveling using deformation marks arranged evenly around the perimeter of the building. The site on which a ten-story residential building was built was chosen due to difficult engineering and geological conditions. The zero cycle of observations was carried out, cycles after the construction of each floor of the building, its acceptance for operation, occupancy of the building and every subsequent 2-3 years. Results. The load-bearing capacity of the foundations with the increase in the percentage of soil reinforcement increases with the given parameters in an approximately linear dependence. The given results demonstrate a high correspondence between the experimental and simulated dependences of settlements on pressure. In the stage of plastic deformation, the use of the Hardening Soil model (HSM) more adequately describes the behavior of the soil, while the Mohr-Coulomb model (MCM) slightly overestimates the settlement. The distribution of settlements of the investigated object on strip foundations corresponds to the actual one recorded during long-term geodetic observations. The measured settlement of the foundations of the sections and those obtained by modeling have a satisfactory convergence. Scientific novelty. The correspondence of laboratory and field data and the results of modeling of soil-cement bases of strip foundations was checked. The practical significance. The models of soil behavior and the methods of specifying of soil-cement elements (SCE) for FEM modeling of reinforced soil bases of strip foundations have been tested.
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