Permafrost region thermal pipe subgrade parameter designing method based on energy balance theory

Abstract

The invention discloses a permafrost region thermal pipe subgrade parameter designing method based on the energy balance theory. The method comprises the steps that firstly, a judging threshold value of the heat dissipation amount of thermal pipes is set; secondly, soil melting latent heat is worked out, specifically, the soil melting latent heat of a constructed permafrost region subgrade is worked out; thirdly, the heat dissipation parameter range of the thermal pipes is determined, specifically, the heat dissipation parameter range of the thermal pipes is determined according to combination of the set judging threshold value of the heat dissipation amount of the thermal pipes with the soil melting latent heat; and fourthly, the thermal pipe structural parameter and the arrangement interval are determined, specifically, the thermal pipes are selected according to the determined thermal pipe heat dissipation parameter range, and by combining the structural parameter of the selected thermal pipes, the thermal pipe arrangement interval in the constructed permafrost region subgrade is determined. The method is simple in step, reasonable in design, convenient to implement and good in application effect, and according to the predetermined soil melting latent heat, the thermal pipe structural parameter and the arrangement interval of the permafrost region thermal pipe subgrade are determined based on the energy balance theory.

Description

technical field [0001] The invention belongs to the technical field of road subgrade construction, and in particular relates to a method for designing thermal rod subgrade parameters in permafrost regions based on the principle of energy balance. Background technique [0002] Permafrost refers to land that has been frozen for three or more years under natural conditions. Permafrost accounts for about 26% of the earth's land area, and it is mainly distributed in cold regions at high latitudes or high altitudes. There are about 1.9 million square kilometers of permafrost in China, mainly distributed in the Qinghai-Tibet Plateau, Greater Khingan Mountains and Lesser Khingan Mountains, as well as the Altai Mountains, Tianshan Mountains, Qilian Mountains and Himalayas. Two-phase gravity thermosiphon, also known as heat rod, is a new type of high-efficiency heat transfer element, which mainly relies on the gas-liquid phase change and gravity reflux of the internal working fluid t...

AI Technical Summary

Problems solved by technology

This situation makes it difficult to design the hot rod roadbed through quantitative calculations in advance according to specific engineering conditions, and accurately predict its stability, thus limiting its popularization and application

To sum up, in order to scientifically and rationally design hot-rod subgrades and maximize their effects, "foresighted" research is still needed, and there is still a lack of systematic summaries in this regard

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