Permafrost region hot rod roadbed design calculation method based on heat budget balance principle

Abstract

The invention discloses a permafrost region hot rod roadbed design calculation method based on heat budget balance. The method comprises the following steps: collecting air temperature and wind speeddata of a region where a project is located, finding out physical parameters of roadbed filler and foundation soil and natural upper limit depth and ground temperature data of permafrost of a foundation, and measuring the section size of a roadbed; selecting a proper hot rod model according to specifications and engineering requirements; calculating the influence radius of the hot rod refrigeration and the influence range in the roadbed; calculating the annual net heat absorption capacity of the roadbed within the hot rod refrigeration influence range; calculating the refrigerating capacity ofa single hot rod; and determining the number and arrangement mode of the hot rods. The basic principle of the calculation method is to ensure that the annual refrigerating capacity of the hot rod isnot less than the annual net heat absorption capacity of a roadbed-foundation system, a theoretical basis is provided for design and calculation of the hot rod roadbed, the problem of design and calculation of the hot rod roadbed is solved, and the calculation method has great engineering application value. The method is simple, feasible, scientific and reasonable, and roadbed settlement deformation caused by degradation and thaw collapse of permafrost of the foundation can be controlled.

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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