METHOD FOR INJECTION FIXATION AND REINFORCEMENT OF BASES OF FOUNDATIONS OF DEFORMED AND RECONSTRUCTED BUILDINGS AND STRUCTURES, CARRIED OUT BY IMPREGNATING WATER-SATURATED SOILS USING LOW-VISCOSITY HIGH-PENETRATING GELLING HARDENING SOLUTION BASED ON SILICA SOL AND ORGANOSILICON COMPOSITIONS Russian patent published in 2024 - IPC E02D3/12 

FIELD: geotechnical construction.

SUBSTANCE: invention relates to the field of geotechnical construction, namely to the method of injection fixation and reinforcement of foundations of deformed and reconstructed buildings and structures, carried out by means of impregnation of water-saturated soils. Method of injection fixation and reinforcement of bases of foundations of deformed and reconstructed buildings and structures is carried out by means of impregnation of water-saturated soils using low-viscosity high-penetrating gelling hardening solution based on silica sol and organosilicon compounds. Method involves arrangement of injection wells, through which a low-viscosity high-penetrating gelling hardening solution based on silica sol and organosilicon compounds is pumped under pressure. Arrangement of injection wells is performed below the base of the foundation so that for three wells supplying low-viscous high-penetrating gelling hardening solution based on silica sol and organosilicon compositions there is one unloading well. Further, a low-viscosity high-penetrating gelling hardening solution based on silica sol and organosilicon compositions is pumped into 3 wells with a working injection pressure of not more than 0.15 MPa (1.5 atm.) and a feed rate equal to the filtration coefficient of the soil being strengthened, until the beginning of the appearance of a low-viscosity high-penetrating gelling hardening solution based on silica sol and organosilicon compositions in the unloading well, through which at the moment of pumping of low-viscosity high-penetrating gelling hardening solution based on silica sol and organosilicon compositions, pore water is squeezed out of the soil to be strengthened. When pressure is increased to 0.25 MPa (2.5 atm.), works are stopped until pore pressure dissipates for up to 6 hours, then works are continued. After completion of works, the supply wells are plugged and control injection of low-viscosity high-penetrating gelling hardening solution based on silica sol and organosilicon compositions is performed through the unloading well until the failure pressure reaches 0.20 MPa (2.0 atm.) for at least 15 minutes, then after completion of works unloading well is plugged, wherein gelation of low-viscosity highly penetrating hardening solution based on silica sol and organosilicon compositions takes place in controlled time from 1 to 24 hours and soil is gradually cured.

EFFECT: increase in the strength and deformation characteristics of the soil in the base of existing foundations and, as a result, increase in its bearing capacity, increased efficiency of fixation of water-saturated fine-grained sandy, dusty and clay soils without disturbing their structure, minimization of technological effect of the process of performing works on injection fixation of the base of the existing building on its deformation.

1 cl, 3 dwg