METHOD FOR COMPACTING BASES FORMED BY WEAK MINERAL SOILS Russian patent published in 2018 - IPC E02D27/26 

FIELD: construction.

SUBSTANCE: method for compacting bases formed by weak mineral soils includes making a well, filling a compacting material into the well, and creating the compacting impact by a hollow tubular working tool on the compacting material to form a compacting column. Preliminarily, engineering geological survey of the base soil is carried out, and the values of the strain modulus, the Poisson's ratio, the angle of internal friction, the specific cohesion, the specific gravity, the initial porosity coefficient of the weak mineral soil are determined. Then, the effective value of the strain modulus ε_i at expanding the compacting material in the well is calculated by the initial and specified porosity coefficient of the weak mineral soil according to the given dependence. Thereinafter the column spacing pitch is defined by the selection method in a range from one to three diameters of the columns, which gives the value of the design base deformation modulus, the necessary increase of the well radius in the process of indentation is calculated by the given dependencies. The well is made by means of indenting a tool in the base soil, filling the compacting material into the well is carried out through the working tool cavity, and the compacting impact for forming a compacting column is carried out by indenting the working tool into the compacting material. Additional engineering and geological survey are carried out on the site, the deformation modulus of the compacted soil between the columns, and the actual average deformation modulus of the base as a whole is calculated according to the given dependence. Then it is compared with the design one, and if the actual average base deformation modulus does not correspond to its design value, additional columns are installed between previously installed ones.

EFFECT: increasing soil compaction productivity, reducing material consumption and labour intensity.

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