ENGINEERING GEOLOGY WORLD Vol. XV, No. 2/2020
Mosina A.S., Nikolaeva S.K., Skvortsov A.A.
Mosina A.S., Nikolaeva S.K., Skvortsov A.A., 2020. Forecast of changes in the condition of the permafrost soil mass under the influence of the construction and operation of underground reservoirs for disposal of waste drilling in the conditions of the Far North (on the example of the Middle Yamal). Engineering Geology World, Vol. XV, No. 2, pp. 68–81, https://doi.org/10.25296/1993-5056-2020-15-2-68-81.
Active development of oil and gas fields in the Far North is accompanied by the problem of drilling waste utilization. One of the variants of it solution is the burial of drilling wastes into underground reservoirs constructed in the massifs of permafrost sandy soils by their water and thermal destruction. Underground wastes disposal has a number of advantages over other methods: low cost of reservoir construction and operation, high environmental reliability, however, as well as all technologies are not without disadvantages. The article shows that the use of existing calculation methods of reservoirs stability gives overestimated results. The calculation is made only at one constant soil temperature, does not take into account changes in soil properties and temperature behind the contour of the plastic frozen state zone neither during construction nor during operation. Based on the calculation of stress-strain state around the reservoir with the consideration of temperature factor, it is shown that the increase in temperature of surrounding permafrost soils reduces the stability of the reservoir and increases settlements of the Earth surface. Based on the results of modeling the stress-strain state of the soil mass around the underground reservoirs, their best and worst configurations for construction were revealed. The most optimal ratio of the reservoir height to its maximum radius has been determined. Based on the results of the researches, a detailed forecast of changes in the engineering and geological conditions of the construction site is given. Therefore, according to the results of mathematical modeling of the thermal interaction of permafrost soils with buried drilling wastes, the process of drilling wastes freezing is analyzed, the increase of permafrost soils temperature and it remediation over time are estimated. According to the results of laboratory triaxial tests, the dynamics of the physical-mechanical properties of permafrost soils as a result of temperature increase was determined. The reservoir stability calculation reflects the expected changes in the natural stress state of the permafrost soil mass and possible settlement of the Earth surface.
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ANNA S. MOSINA
Postgraduate Student of the Department of Engineering and Ecological
Geology, Faculty of Geology, Lomonosov Moscow State University;
Moscow, Russia
SVETLANA K. NIKOLAEVA
PhD (Geology and Mineralogy); Associate Professor in the Department
of Engineering and Ecological Geology, Faculty of Geology,
Lomonosov Moscow State University; Moscow, Russia
ALEXEY A. SKVORTSOV
PhD (Technics); Head of the Department of Geomechanical and
Hydrodynamic Modeling, Gazprom Geotechnology LLC; Moscow,
Russia