Deep strengthening and reinforcement of soils are employed to improve the quality of soils prone to slump-type settlement, fill soils, and other structurally unstable and weak saturated soils. The I. I. Vorovich Scientific-Research Institute of Mechanics and Applied Mathematics at the Southern Federal University has, in conjunction with the OOO NIPP INTROFEK developed a procedure and equipment for deep grouting of soils through directed fissures. Strengthening and reinforcement of the soils is carried out by elements of increased stiffness formed from soil-cement stone [1][2][3][4].The procedure employed for reinforcement consists in pressure injection of an ecologically safe foamed soil-cement grout through directed fissures created when the pressure in the hole is raised with a triangular stress riser. At sites where highly compressible saturated soils of highly plastic and fluid consistency exist, the operations should be carried out under the pressure of a foamed soil-cement grout with a density that eliminates collapse of the wall of the hole and provides stability and shape to the stress riser. Face development is accomplished in a hole filled with the soil-cement grout by a special device with an extensible rotary cutting tool [2,4]. Free recesses exist at the tip of the tool for the passage of grout when the device moves in the hole (see Fig. 1).Geologic-engineering surveys were performed, and strength tests conducted on the reinforced bed to assess the reinforcing effectiveness of the highly compressible saturated soils on the construction site of a Series 90.10-05 ten-story tenement building on Truzhenikov Street in Rostov-na-Donu after the soils had been strengthened.The geologic-engineering section of the site is represented by: − unconsolidated fill soils with a layer thickness of 0.2-5.5 m, which are composed of a mixture of clayey loams and 7-30% of construction debris; − soils prone to slump-type settlement with a layer thickness of 1.0-2.6 m to a depth of 1.2-5.5 m from the ground surface. These soils are exposed in the northern section, and do not spread into the A method is proposed for the strengthening of highly compressible saturated soils by the method of injection through directed fissures. Test results are presented for the reinforced bed of a conventional foundation subjected to static loads. Results of the investigations are being successfully applied to the construction of two ten-story buildings in Rostov-na-Donu.
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