METHOD OF SEALING THE BASES BROKEN BY WEAK MINERAL SOILS Russian patent published in 2018 - IPC E02D27/26 

FIELD: construction.

SUBSTANCE: invention relates to construction, in particular to methods for strengthening soils under the foundations and foundations of buildings and structures, incl. objects of electric power industry. Method of compaction of bases composed of weak mineral soils includes making wells, feeding the sealing material to each well, and creating an impact by the hollow tubular working tool on the sealing material to form a ground pile. Preliminary perform geotechnical surveys on the base area and determine the values of the strain modulus, Poisson's ratio, the angle of internal friction, the specific cohesion, the specific gravity, the initial porosity coefficient of the weak mineral soil, set the required design modulus of deformation of the compaction soil layer, then, taking value ε_i deformation expansion of each well is equal to 0.1, calculate the porosity coefficient of the weak mineral soil after compaction around the soil pile e_i according to the given dependence. Determine at each step the predicted value of the flow index of a weak mineral soil according to the given dependence. Then, according to the known normative values, the nearest preliminary value of the strain modulus E_Ϩ surrounding a ground pile of mineral soil depending on the obtained values of the porosity coefficient of the weak mineral soil after compaction around the pile e_i and soil flow index after compaction I_L2, then take the step of placing the ground piles equal to three diameters of the hollow tubular working tool and determine the value of the actual average reduced modulus of the base deformation according to the reduced dependence. It is compared with the design deformation module of mineral soil, and, in the case of obtaining a smaller actual average reduced modulus of ground deformation than the design, increase value ε_i deformation expansion of the well iteratively with a step of 0.1 and the calculation of the actual average reduced modulus of the base deformation is repeated until the design value or step of placing the ground piles is equal to the value of 1.5 of the diameter of the hollow tubular working tool. Increase in the radius of the well corresponding to the value of the accepted deformation of the expansion during the indentation is calculated from the given dependence. Length of the soil pile is taken to be equal to the distance from the roof to the sole of at least one layer requiring compaction. Then a well is made corresponding to the length of the soil pile by piercing a hollow tubular working tool, feeding the sealing material into the borehole is carried out through the cavity of the hollow tubular working tool, and the sealing action to form the ground pile is effected by pressing the hollow tubular working tool into the sealing material, then it is made an additional engineering and geological surveys on the area of the base, determining the modulus of deformation of the compacted mineral soil between the ground piles. Actual average reduced modulus of deformation of the compacted substrate is calculated and compared with the design value, and if the actual mean reduced modulus of the base deformation does not correspond to the design value, additional ground piles are installed between previously installed ones.

EFFECT: technical result consists in increasing the productivity of compaction of soil, reducing the material consumption and labor intensity, ensuring the realization of the compaction of the foundation, composed of weak mineral soils, by determining the optimal design parameters of the ground piles throughout the base area.

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