Calculation of thermal stress-strain state of soil base under the building on permafrost soil

Mikhail Rabinovich,A Volkov,A Adamtsevich,T Sultanov,A Pustovgar

doi:10.1051/e3sconf/20199704056

Mikhail Rabinovich, A Volkov + Show 3 more

Open Access

https://doi.org/10.1051/e3sconf/20199704056

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Abstract

Article presents problem statement and solution for joint calculation of temperature regime and stress-strain state of permafrost soils under building footing, with consideration of thermal impact from on-surface and buried high-temperature utilities. Based on a series of optimization tasks, a design model for stress-strain state has been developed, solutions of test problems have been obtained and analyzed to determine the degree of influence of temperature stresses and relation of the deformation characteristics of frozen soil in the negative temperature spectrum on the stress distribution and settlement values of frozen soil base under the building.

Highlights

Thermal stress-strain state calculation of heterogeneous soil bases with account for cryogenic processes is an important and complex task, that does not currently have common and rigorous solution
In order to identify the degree of influence of temperature stresses and to factor in relation of the deformation modulus Е0 to temperature, a series of problems to calculate thermal stress-strain state of the frozen soil base of the building, with consideration of the temperature factor
Noteworthy is the fact that factoring in the development of thermal stresses and strains when calculating thermal stress-strain state leads to a sign reversal of tangential stresses in a total of 40% of the calculated array

Summary

Introduction

Thermal stress-strain state calculation of heterogeneous soil bases with account for cryogenic processes is an important and complex task, that does not currently have common and rigorous solution. There are a large number of publications on the theory of thermal conductivity and its technical applications in relation to permafrost soils [1,2,3,4,5,6]. In most approaches it is assumed that the thermal conductivity coefficient and the volumetric heat capacity of the medium change abruptly at freezing and defrosting points. Such change in thermophysical properties greatly complicates application of numerical methods to solve thermal conductivity problems with a phase transition. Numerical approach to solution of this type of problems is greatly facilitated by using "enthalpy-heat flow" method

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