The variability in the annual heat turnover layer of the effective values of the electrophysical properties of sandstones of South Yakutia, which form the foundations of engineering structures in Neryungri, has been studied by remote inductive sensing. In the upper weathered part of the sandstones at a depth of 0–5 m, the background values of electrical resistance and dielectric constant are 856 ohms·m and 6.4 rel.units. In the lower fractured part of the sandstones, the background values at a depth of 5–14 m are less than and equal to 1538 Ohms·m and 4,8 rel.units. The spatial variability of the values of the electrophysical properties of sandstones, as well as their strength, are correctly described by Weibull’s law. The information capacity of the dielectric constant in studying the variability in depth of the degree of compaction and structural strength consolidation of sandstones is significantly lower than the electrical resistance. Their combined use increases the geological information content and gives reason to decide that in relation to weathered sandstones lying at a depth of 0–5 m, the degree of compaction and structural strength consolidation of fractured sandstones lying at a depth of 5–14 m increases by 1,3–1,8 times. Such an assessment of the degree of compaction and consolidation of sandstones, previously unknown in engineering geology and soil science, was first obtained in the annual heat turnover layer by geophysics in the built-up area of South Yakutia.

Leonid G. Neradovskii
Doctor of Technical Sciences
Senior Researcher at the Laboratory of Engineering Geocryology
Melnikov Permafrost Institute SB RAS
36, Merzlotnaya St., Yakutsk, 677010, Russia
е-mail: leoner@mpi.ysn.ru

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