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THM-coupled numerical analysis of temperature and groundwater level in-situ measurements in artificial ground freezing

Authors

  • Anastasiia Kostina Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Russia https://orcid.org/0000-0002-5721-3301
  • Maxim Zhelnin Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Russia https://orcid.org/0000-0003-4498-450X
  • Oleg Plekhov Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Russia
  • Kirill Agutin Institute of Nature Management of the National Academy of Sciences of Belarus, Belarus

DOI:

https://doi.org/10.3221/IGF-ESIS.61.01

Keywords:

Saturated freezing soil, Artificial ground freezing, Thermo-hydro-mechanical model, In-situ measurements, Ice wall integrity

Abstract

Belarusian Potash salt deposits are bedded under aquifers and unstable soil stratums. Therefore, to develop the deposits a vertical mine shaft sinking is performed using the artificial ground freezing technology. Nowadays, real time observations of ground temperature and groundwater level is applied to control the ground freezing process. Numerical simulation can be used for a comprehensive analysis of measurements results. In this paper a thermo-hydro-mechanical model of freezing of water saturated soil is proposed. The governing equations of the model are based on balance laws for mass, energy and momentum for a fully saturated porous media. Clausius-Clayperon equation and poroelastic constitutive relations are adopted for description of a coupled change in water and ice pore pressure, porosity and a stress-strain state of freezing soil. The proposed model enables us to describe evolution of equivalent water content measured in Mizoguchi’s test and predict frost heave strain in one-sided freezing test. Numerical simulation of ground freezing in the Petrikov mining complex located in Belarus has shown that the model is able to describe field measurements of pore pressure inside a forming frozen wall. Furthermore, the mismatch between hydro- and thermo-monitoring data obtained during the artificial freezing is analyzed.

Issue

Section

Analytical, Numerical and Physical Models

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