Purpose. The aim of the work is to substantiate the technological parameters of effective use of reinforced soil-cement piles obtained by jet mixing technology. Such studies are needed to determine the possibility of increasing the bearing capacity of pile foundations in the body of earthen structures of buildings and roads. Methodology. Determination of bearing capacity of reinforced soil-cement piles was carried out by reasonable choice of structure, soil base, material, depth of piles in accordance with engineering and geological conditions, structural scheme of the structure and method of their arrangement. Findings. Significant differences in soil engineering and geological elements in plan and depth necessitated an in-depth study of soil characteristics, so it was decided to determine their strength and deformability based on static probing of reinforced piles. Analysis of the results of static studies showed that the soil-cement pile, reinforced with a reinforcing frame, has a higher bearing capacity in soil and material, and the unloading branch confirms the fact that in specific conditions the soil and piles work in elastic mode. Originality. It consists of the obtained dependences of the change of vertical loads on the reinforced soil-cement pile, created on the basis of brown mixing technology. Graphs of the dependence of the values of deformations occurring during the action on the reinforced soil-cement pile under static loading and unloading are obtained. Practical value. In practical conditions, the solution for the manufacture and testing of static load of the experimental reinforced soil-cement pile was implemented at the construction site. The manufacturing technology is designed so that the spatial frames of the soil-cement element with a length of 5…7 meters are immersed under their own weight, and the frames of 12 and more meters are lowered with a vibrator.
Purpose. The purpose of the work is to analyze the results of the test of the embankment reinforcement with reinforced soil-cement piles. Methodology. An analysis of the ground reinforcement situation was carried out with the definition of modern trends in the use of geosynthetic materials and soil-cement piles. An algorithm for strengthening the embankment with reinforced soil-cement piles using a special square bit has been developed and implemented in practice. The load-bearing capacity of reinforced soil-cement piles was determined by reasoned selection of the structure, soil base, material, depth of pile laying in accordance with engineering and geological conditions, the structural scheme of the building and the method of their arrangement. Findings. 6 piles with a length of 21 m to 23 m were tested. During the manufacture of piles Nos. 1, 4 and 6, the length of which was 22...23 m, during drilling it was found that massive monolithic granite lies at their base (the granite was sunk by 0.5 m), the presence of cracks in which was not fixed. Piles Nos. 2, 3, 5 had cracked granites as their base, they were also deepened by 0.5 m. For these reinforced soil-cement piles, the values of the vertical displacements of the pile during its loading and unloading in stages were obtained. The calculated pressing load on the tested pile ranges from 268.3 t·s to 275.0 t·s. Originality. It consists in obtaining dependences of settlements of reinforced soil-cement piles, created on the basis of jet mixing technology, during their testing in loading and unloading modes. Practical value. It was determined that by changing the stiffness of the embankment, since soil-cement reinforced elements can be manufactured with a deformation modulus of 300...600 MPa, the problem of its strengthening is solved. Practically, it is possible to reduce the difference in the stiffness of the artificial structure and the structure of the track superstructure, which will allow eliminating ballast recesses.
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