Novel subgrade structure for preventing road frost boiling in cold area

Abstract

The invention discloses a novel subgrade structure for preventing road frost boiling in a cold area. The structure is formed by waterproof geotextile, a broken stone layer, permeable geotextile and subgrade embankment, wherein after paving the subgrade embankment formed by coarse grained soil on a compacted natural ground surface, the waterproof geotextile is paved; then the broken stone layer is paved on the waterproof geotextile; and after the permeable geotextile is paved on the top of the broken stone layer, the subgrade embankment is paved. In the structure, water generated when the subgrade embankment is melted enters the broken stone layer in a subgrade by utilizing the permeable geotextile and is discharged from the two sides of the subgrade through the broken stone layer; and the frozen depth of frozen earth is reduced by utilizing a heat insulation effect of the broken stone layer so as to reduce the water migrated into the subgrade from the lower part of the subgrade in a freezing process. The waterproof geotextile can not only prevent the water in the lower part from migrating into the upper part of the subgrade, but also prevent the water in the upper part of the subgrade from permeating into the lower part of the subgrade. The subgrade structure can effectively reduce the water content of the subgrade embankment and prevent road frost boiling disease in the cold area, so as to ensure high-quality operation of a road in the cold area.

Description

technical field [0001] The patent of the present invention relates to a subgrade structure for roads in cold regions, which can effectively reduce the water content of road subgrades in cold regions, prevent road muddying, and ensure high-quality operation of roads in cold regions. Background technique [0002] Frozen soil refers to soil and rocks with negative temperature and ice, and is mainly divided into permafrost and seasonal frozen soil according to the survival time. my country is the third largest country in the world with permafrost accounting for about 22% of the country's land area, and seasonally frozen soil accounting for about 48% of the country's land area. Due to the existence of ice and unfrozen water in permafrost, its properties are extremely complex, and it is very sensitive to temperature. When the temperature rises, the ice in it will melt into water, resulting in a decrease in bearing capacity, which will bring various problems to projects in cold reg...

AI Technical Summary

Problems solved by technology

However, both indoor experiments and actual engineering have proved that the method of replacing coarse-grained soil can only reduce frost heave, but cannot eliminate water migration.

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