Abstract
The values of the velocities of longitudinal refracted waves obtained in 1979–1999 are generalized. by the method of refracted waves during the work of the Yakut trust of engineering and construction surveys in the built-up area of the valley of the river. Lena Tuymaada. A normal probabilistic law for the spatial distribution of velocity values in all lithotypes of Quaternary deposits has been established. In the permafrost zone of the Central Yakut Plain in the Tuymaade valley, the general law of the growth of velocities with depth depending on the growth of volumetric weight has been confirmed. Local variations in the spatial variability of the speed of the refracted wave are due to the combined effect of the main ground-frost factors: salinity, ice content and porosity. The most variable was the speed of the refracted wave in clay facies — loams and sandy loams of lacustrine-marsh deposits. The average velocity with an equal volumetric weight of sedimentary rocks is practically the same in the Tuymaade valley and in the permafrost zone of South Yakutia. Such a regional petrophysical feature creates favorable engineering and geocryological conditions for the application of the refracted wave method in the permafrost zone, both in Central and South Yakutia, to solve one of the important basic engineering geological problems. Namely, determining the depth of occurrence of semi-rocky and rocky bedrocks of sedimentary genesis in the bases of the foundations of engineering structures. The analysis of theoretical variograms of refracted wave velocities showed that the reliability of probabilistic-statistical solutions in recognizing the boundary between the frozen strata of Quaternary deposits and bedrock in the Tuymaade valley is very high and amounts to 99.5 %. With a maximum but small error of 15.5 %, the boundary between the seasonally thawed cultural layer and loamy-sandy lacustrine-marsh deposits is recognized.
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