Active cooling structure for permafrost roadbed in aeolian sand area and construction method

Abstract

The invention discloses a permafrost roadbed active cooling structure in an aeolian sand area and a construction method, the permafrost roadbed active cooling structure comprises a natural foundation, a block stone interlayer and obliquely inserted heat pipes, the natural foundation is an expressway roadbed in the aeolian sand area; the longitudinal section of the block stone interlayer is in an inverted T shape, the lower portion of the inverted T shape is a transverse block stone layer, the upper portion of the inverted T shape is a vertical block stone layer, and the transverse block stone layer is laid on the natural foundation; the vertical block stone layer is vertically arranged in the middle of the transverse block stone layer in the transverse direction, and the trend of the vertical block stone layer is along the trend of the expressway; the vertical block stone layer is used as a middle isolation zone; the inclined insertion heat pipes are V-shaped pipe bodies with two closed ends, and liquid ammonia is filled in the inclined insertion heat pipes; the included angle of the V-shaped pipe body is an obtuse angle, and two arms are an evaporation section and a condensation section respectively. By adopting the cooling structure, the problem that the permafrost structure protection efficiency is insufficient due to the fact that permafrost and aeolian sand below the wide highway roadbed in the permafrost region are protected is solved.

Description

technical field [0001] The invention belongs to the technical field of temperature control of permafrost subgrades, and in particular relates to an active cooling structure and construction method for permafrost subgrades in aeolian sand regions. Background technique [0002] Frozen soil is a kind of rock and soil whose temperature is lower than 0℃ and contains ice. The mechanical strength of frozen soil is closely related to temperature. In my country, permafrost regions are mainly distributed in the Qinghai-Tibet Plateau, Greater Khingan Mountains and Lesser Khingan Mountains, accounting for about 22.4% of the country's land area. [0003] In the permafrost region of the Qinghai-Tibet Plateau, the construction of subgrades changes the energy balance between the natural surface and the atmosphere, which inevitably accelerates the degradation of permafrost. In turn, degradation of the permafrost beneath the subgrade threatens the stability of the subgrade, causing uneven se...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an active cooling structure and construction method for the permafrost subgrade in the aeolian sand area, which solves the problem of protecting the permafrost structure under the wide expressway subgrade in the permafrost area and aeolian sand. The problem of insufficient performance

Images