Design and calculation method of hot rod subgrade in permafrost region based on the principle of heat budget

Abstract

The invention discloses a design and calculation method for hot rod subgrade in permafrost regions based on heat budget balance, which collects data on air temperature and wind speed in the area where the project is located, and finds out the physical parameters of subgrade filler and foundation soil and the natural characteristics of permafrost soil in the foundation. Upper limit depth and ground temperature data, measure subgrade section size; select appropriate hot rod model according to specifications and engineering needs; calculate thermal rod cooling influence radius and influence range in the roadbed; calculate annual net heat absorption of subgrade within the thermal rod cooling influence range ; Calculate the cooling capacity of a single hot rod; determine the number and arrangement of the hot rods. The basic principle of this calculation method is to ensure that the annual cooling capacity of the thermal rod is not less than the annual net heat absorption of the subgrade-foundation system, which provides a theoretical basis for the design and calculation of the thermal rod subgrade, solves the problem of thermal rod subgrade design and calculation, and has great significance Engineering application value: It is simple, feasible, scientific and reasonable, and can control the subgrade settlement and deformation caused by the degradation and thawing of permafrost.

Description

technical field [0001] The invention belongs to the technical field of heat protection design for subgrades in permafrost regions, and relates to a thermal rod subgrade design calculation method in permafrost regions based on the principle of heat budget balance. Background technique [0002] In recent years, with the support of the country's western development strategy, the transportation undertakings of Qinghai Province and Tibet Province have developed rapidly. Due to the high altitude of Qinghai and Tibet provinces and the widespread development of permafrost, more and more road projects are built in permafrost areas, which will change the thermal balance of permafrost in the foundation, especially in black asphalt pavement conditions Under this condition, the heat absorption of the permafrost in the foundation will increase sharply, causing the permafrost to heat up and thaw, resulting in subsidence and deformation of the subgrade. In the 1950s, the U.S. Army Corps of...

AI Technical Summary

Problems solved by technology

However, the existing calculation methods only calculate the cooling consumption required for the upper limit of permafrost uplift and ground temperature reduction, or the heat consumption of permafrost melting under hypothetical conditions, without considering the annual net heat absorption of subgrades from the perspective of heat balance

If the annual cooling capacity of the hot rod is less than the annual net heat absorption of the subgrade, the permafrost will still be in a degraded and thawed state, and the subsidence deformation of the subgrade will not be controlled

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