SIGNIFICANCE AND TECHNOLOGICAL CAPACITIES OF NATURAL STUDY OF THE GROUND PORE PRESSURE DYNAMICS UNDER THE FREEZING AND THAWING CONDITIONS

© 2019 А. А. Ginzburg^1,*, R. G. Kal'bergenov¹, V. S. Isaev^2,***, G. S. Tipenko¹,
D. O. Sergeev^1,**, А. N. Khimenkov¹

¹Sergeev Institute of Environmental geoscience, Russian Academy of Sciences,
Ulanskii per., 13, bld. 2, Moscow, 101000 Russia
^*E-mail: galab3@yandex.ru
^**E-mail: cryo2@yandex.ru
²Lomonosov Moscow state university, Geological Faculty,
Leninskie Gory, 1, Moscow, 119991 Russia
^***E-mail: tpomed@yandex.ru

Actual geotechnical monitoring systems and models of geocryological processes are aimed at as­sessing and preventing hazardous dynamic impacts on infrastructure facilities in the Arctic and Sub­arctic of Russia. The level of methodological support and hardware development of these systems are insufficient in Russia in the context of a changing climate, growing environmental impact and de­creasing quality of geological survey and design. Pore pressure is successfully studied at the sample level in the laboratory and in the field by using the static sensing method, however, the dynamics of pore pressure and the physical patterns of this dynamics in soil massifs remain studied inadequately. For theoretical reasons, pore pressure should change under the influence of processes associated with freezing and thawing, and, consequently, it should affect the intensity of gas hydrate dissociation as well as the mechanical properties of soils. The modern technological base provides new opportunities for the study of the pore pressure dynamics in the soil mass. This opens prospects for improving ge­otechnical monitoring systems for the protection of infrastructure facilities from adverse natural and man-made impacts.

Keywords: pore pressure, soil freezing, thixotropic liquefaction of soil, cryogenic heaving.

DOI: https://doi.org/10.31857/S0869-78092019582-88

REFERENCES

1. Dydyshko, P.I. Deformatsii zemlyanogo polotna zheleznodorozhnogo puti i ikh ustranenie v usloviyakh vechnoi merzloty [Deformations of the road bed of the railway track and their elimination in the permafrost]. Kriosfera Zemli, 2017, vol. 21, no. 4, pp. 43-57. (in Russian)

2. Jacobson, A., Push, R. Yavlenie tiksotropii v per emyatykh myagkikh glinakh [The phenomenon of thixotropy in crushed soft clay]. Proceedings of the Intern. Symp. (September 14-24, 1971) Engineering-geological properties of clay rocks and processes in them. Moscow, MGU Publ., 1972, pp. 25-34. (in Russian)

3. Ma, W., Chen, T. Analysis of permanent deformations of railway embankments under repeated vehicle loadings in permafrost regions. Sciences in cold and arid regions, 2015, vol. 7, issue 6, pp. 645-653.

4. Xiaoliang, Y., Junlin, Q. Vehicles loading effects on thawing embankment. Proc. IX International Symposium. Problems of permafrost engineering. R.V. Zhang, Ed-in-Chief. Yakutsk, Melnikov Institute of Cryology SB RAS Publ., 2011, pp. 343-348/