Abstract
The paper describes a solution to the problem of maintain the stability of a fill slope through artificial freezing with seasonal cooling units in cryolithozone. A three-dimensional mathematical model was developed to calculate the heat flow in a fill slope reinfirced with a gabion wall, taking into account the liquid-liquid phase transition and the use of seasonally operating cooling units. The developed mathematical model, based on the finite difference method and implemented as an application for Microsoft Windows, allows making a long-term forecast of a temperature field in a fill slope, depending on various design and technological parameters (location, dimensions and an operating mode of thermal stabilizers) and its effect on the stability of the slope. The results of studying the contribution of thermal stabilization to a reduced destructive temperature effect of the environment on the slope are given. The study showed the effectiveness of using seasonal cooling units for increasing the stability of fill slopes by freezing. In subsequent years after the thermal stabilization, the frozen zone in the fill slope is preserved, with the slope gradually switching to the natural seasonal temperature regime. The paper is recommended for researchers and designing engineers dealing with applied issues of mining thermal physics.
Highlights
Prone to landslides and ground displacement, slopes pose a danger to human life
This paper solves the problem of ensuring the stability of a fill soil slope by artificial freezing with seasonal cooling units (SCU) in cryolithozone
To maintain the stability of the slope with frozen ground, there were installed vertical SCU thermal stabilizers operating in the cold season in two staggered rows along the wall and in one row on the top of the slope
Summary
Prone to landslides and ground displacement, slopes pose a danger to human life. Artificial freezing of soils is one of universal and reliable ways to stabilize them and ensure their waterproofness. This paper solves the problem of ensuring the stability of a fill soil slope by artificial freezing with seasonal cooling units (SCU) in cryolithozone. An important feature of the SCUs is that they do not require external power supply and operate using the natural cold of the atmospheric air. The SCUs help to solve complex technical problems during construction on permafrost and significantly reduce expenditures. The use of these units requires scientific justification, calculations, and experience. If used without a reason, instead of a positive effect on permafrost ground massifs (increased bearing capacity), they may have a negative effect (frost cracking, soil swelling, etc.) [1]
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