A roadbed thermal insulation construction method in permafrost regions
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A construction method and frozen soil technology, applied in roads, roads, buildings, etc., can solve problems such as subgrade and pavement cracking, subgrade lifting, etc., to avoid frost heaving and thawing settlement, increase net heat release, and inhibit crack development Effect
Active Publication Date: 2018-12-11
ZHENJIANG COLLEGE
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Problems solved by technology
If the frost heaving force formed is greater than the load on the base, the subgrade may be lifted, causing the subgrade and road surface to crack
Method used
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Embodiment 1
[0026] The subgrade thermal insulation construction method in permafrost regions of the present invention comprises the following steps:
[0027] (1) Excavate the permafrost below the ground line in the permafrost layer, and lay polypropylene base cloth as the insulation berm;
[0028] (2) Lay the capillary water isolation layer with low liquid limit clay, and roll it 2~3 times with rolling equipment;
[0029] (3) Pave the block stone layer in a one-time pouring method to ensure sufficient pores;
[0030] (4) Lay small stones on the block stone layer to prevent the following reverse filter layer from leaking into the block stone layer and thus affect the ventilation effect. The paving thickness of the block stone layer is 125cm, and the rolling equipment is used to roll 6~8 times;
[0031] (5) Lay the gravel filter layer and the thick medium-coarse sand filter layer; the thickness of the gravel filter layer is 23cm, and it is rolled 7 to 9 times with rolling equipment, and th...
Embodiment 2
[0036] The subgrade thermal insulation construction method in permafrost regions of the present invention comprises the following steps:
[0037] (1) Excavate the permafrost below the ground line in the permafrost layer, and lay polypropylene base cloth as the insulation berm;
[0038] (2) Lay the capillary water isolation layer with low liquid limit clay, and roll it 2~3 times with rolling equipment;
[0039] (3) Pave the block stone layer in a one-time pouring method to ensure sufficient pores;
[0040] (4) Lay small stones on the block stone layer to prevent the following reverse filter layer from leaking into the block stone layer and thus affect the ventilation effect. The paving thickness of the block stone layer is 125cm, and the rolling equipment is used to roll 6~8 times;
[0041] (5) Lay the gravel filter layer and the thick medium-coarse sand filter layer; the thickness of the gravel filter layer is 23cm, and it is rolled 7 to 9 times with rolling equipment, and th...
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Abstract
The invention discloses a roadbed thermal insulation construction method in a permafrost area. The method includes the following steps that firstly, frozen earth below the ground line is dug out of a frozen earth layer, and polypropylene base cloth is laid as a thermal insulation berme; secondly, low-liquid-limit clay is adopted for laying a capillary water isolation layer, and the capillary water isolation layer is rolled two to three times through rolling equipment; thirdly, a rock block layer is laid in a one-time dump-filling manner; fourthly, finger stones are laid on the rock block layer; fifthly, a gravel reversed filter and a thick medium-coarse sand reversed filter are laid; sixthly, a geotechnical cloth layer and a single-doped or mixed fiber concrete layer are sequentially laid, wherein the water-binder ratio of the single-doped or mixed fiber concrete layer is 0.28; and seventhly, embankment filled earth is laid. The method has the beneficial effects that the problem existing in the roadbed structure in the frozen earth area is solved, crack propagation can be restrained, and therefore the anti-freezing-melting performance of concrete is improved; and meanwhile the frozen earth can be further prevented from being melted, permafrost below a roadbed can be protected through the roadbed, frost heaving and thaw collapsing are avoided, and the safety and stability of the roadbed structure are improved.
Description
technical field [0001] The invention relates to a construction method of a subgrade structure, in particular to a subgrade heat preservation construction method in permafrost regions. Background technique [0002] The hazards of permafrost are mainly divided into two types: frost heaving and thawing. Frozen soil refers to the volume expansion caused by the freezing of water contained in the soil when the soil freezes, which causes uneven expansion force of the subgrade soil and causes damage to the road project. There are countless capillaries in the subgrade soil, and groundwater rises into the subgrade through the capillaries in the subgrade. When winter comes, the water on the surface first freezes into ice crystals, and then the outermost layer of bound water also starts to freeze, making the ice crystals gradually increase. And form an ice interlayer in the soil layer. After the moisture in the subgrade soil freezes, the volume will increase by 9%, and volume expansio...
Claims
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Application Information
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