METHOD FOR MONITORING THE CONDITION OF PERMAFROST SOILS SERVING AS BASE FOR BUILDINGS AND STRUCTURES, AND DEVICE FOR IMPLEMENTING IT Russian patent published in 2021 - IPC E02D1/00 

FIELD: geotechnical monitoring.

SUBSTANCE: invention relates to geotechnical monitoring of permafrost soils and is intended for predicting the critical settlement of foundations of buildings and structures on permafrost soils. Method for monitoring the conditions permafrost soils serving as the basis for the foundations of buildings and structures includes excitation of vibrations, determination of the speed and arrival time of a longitudinal wave passing through the soil mass. At the stage of geotechnical surveys, the static modulus of deformation of permafrost soils is determined, taking into account the load out of the future structure; after the installation of the pile foundation at the pile, observation wells are drilled diametrically; the depth and distance between them are determined according to the results of computer modeling of the soil foundation stress-strain state. To prevent the collapse of the borehole walls, concrete lining is installed in them, and concrete anchor slabs are installed on the surface. Then, low-frequency emitting and receiving ultrasonic transducers with dry point contact are placed in the wells; each transducer has its own serial number, which corresponds to the pile number. Then the ground is sequentially scanned and the time of the longitudinal wave propagation is determined at each position of the emitting and receiving transducers. The obtained data are transmitted to the PC and the velocity of propagation of the longitudinal ultrasonic wave and the dynamic deformation modulus of permafrost soils are calculated, after which the correlation dependence between the dynamic deformation modulus and the static deformation modulus of soils is determined. At the stage of the structure operation periodic measurements of the longitudinal ultrasonic wave propagation time are performed, the dynamic modulus of soil deformation is calculated, after which the static modulus of deformation is recalculated using the previously obtained correlation dependence, the estimated settlement of the structure foundation is performed, and a conclusion is drawn about the state of the permafrost mass.

EFFECT: technical result consists in providing the possibility of continuous monitoring of the permafrost soils deformation properties.

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