Fill subgrade construction method suitable for water-rich low-lying permafrost region

Abstract

The invention discloses a fill subgrade construction method suitable for a water-rich low-lying permafrost region. The fill subgrade construction method comprises the following steps of stamping flagstone silt squeezing replacement construction being conducted; filling a rubble layer cooling layer; paving two pieces of cloth and one film; paving a gravel layer; constructing a roadbed slope toe heat preservation protective channel; laying inverted filter geotextile; paving a gravel layer; paving a gravel cushion layer; and loading subgrade filler which is compact in filling and good in water permeability. According to the method, silt is squeezed and replaced by impacting and rolling the rubble layer, the bearing capacity of the foundation is improved, meanwhile, underground water is prevented from rising to roadbed soil under the action of capillary water, and it is guaranteed that the roadbed is dry; the rubble cooling layer being filled, good gaps among rubbles being utilized to formnatural air convection in winter, and the temperature of permafrost being actively reduced; paving a two-cloth one-film impermeable layer to prevent water in the roadbed body from infiltrating into the permafrost region. The water seepage geotextile and the gravel paving layer have high drainage performance, and the roadbed slope toe heat preservation protective channel prevents frost heaving diseases of a slope toe and prevents slope toe surface water from seeping into a roadbed soil body.

Description

technical field [0001] The invention belongs to the technical field of roadbed construction, and in particular relates to a filling roadbed construction method in water-rich low-lying permafrost regions. Background technique [0002] Permafrost refers to soil (rock) that has been frozen for two or more years. Due to the existence of ice and unfrozen water in frozen soil, its properties are extremely complex and sensitive to temperature. As the seasons change, the strength of the soil will be greatly reduced after repeated freeze-thaw cycles, which will adversely affect the construction and operation of highway projects. The permafrost area in my country accounts for about 22% of the country's land area. Permafrost subgrade diseases are mainly caused by subgrade frost heaving, thawing, muddying, and pavement cracking caused by the freezing and thawing process due to permafrost degradation. In water-rich and low-lying permafrost areas, the surface of the natural foundation i...

AI Technical Summary

Problems solved by technology

With the change of seasons, the strength of the soil will be greatly reduced after repeated freeze-thaw cycles, which will adversely affect the construction and operation of highway projects

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