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Permafrost subgrade structure based on hydrothermal phase change principle and construction method thereof

A frozen soil and roadbed technology, applied in the direction of roads, roads, buildings, etc., can solve the problem of not being able to maintain the thermal stability of the roadbed for a long time, and achieve the effect of simple structure, easy construction, and maintaining thermal stability.

Pending Publication Date: 2019-04-30
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the thermal insulation board not only effectively blocks the heat from the upper part in the warm season, but also prevents the cold energy from the upper part from entering the permafrost foundation under the subgrade in the cold season, the cumulative effect is to consume the permafrost under the subgrade. The cold energy stored in the soil is used as a price, so it is a passive cooling measure for roadbeds in permafrost regions, and cannot maintain the thermal stability of roadbeds for a long time

Method used

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  • Permafrost subgrade structure based on hydrothermal phase change principle and construction method thereof
  • Permafrost subgrade structure based on hydrothermal phase change principle and construction method thereof
  • Permafrost subgrade structure based on hydrothermal phase change principle and construction method thereof

Examples

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Effect test

Embodiment 1

[0023] Embodiment 1: as Figure 1~2 As shown, a permafrost roadbed structure based on the principle of hydrothermal phase transition, which includes a permafrost roadbed 1, the inside of the permafrost roadbed 1 is provided with a hard insulation board 2 along the laying direction, and the interior of the hard insulation board 2 is provided with There are several water grids 3, and each water grid 3 is filled with water. The volume of water filled in each water grid 3 is 92% of the volume of the water grid 3, or 93% of the volume of the water grid 3, or between 92% and 93% of the volume of the water grid any value.

[0024] Wherein the water grid 3 is set during the prefabrication process of the hard insulation board 2, the water yield in each water grid 3 is about 92% of the volume of the water grid 3, and each water grid 3 forms an independent space, and the moisture cannot A leak occurs. The water volume setting at positive temperature can ensure that the water grid 3 pl...

Embodiment 2

[0028] Embodiment 2: as Figure 1~2 As shown, the construction method of a permafrost subgrade structure based on the principle of hydrothermal phase transition described in Example 1 comprises the following steps: (1) laying the lower permafrost subgrade; (2) prefabricating a hard insulation board (3) laying a prefabricated hard thermal insulation board above the permafrost subgrade of the lower layer; (4) laying the upper permafrost subgrade above the hard thermal insulation board layer; wherein,

[0029] (2) Prefabricated hard insulation board layer: in the first step, the bottom of the prefabricated water grid groove 3-1 is correspondingly embedded in the lower groove 2-4 of the lower cover 2-2 of the hard insulation board; the second The first step is to inject water into the water grille groove 3-1 to the water level; the third step is to seal the ring pin 3-4 into the ring slot 3-3 so that the water grille cover plate 3-2 is in contact with the water level. The grid gr...

Embodiment 3

[0031] Embodiment 3: Aiming at the principle of the present invention, this embodiment uses the finite element method to carry out numerical simulation, and provides the calculation process and results:

[0032] 1. Control equation

[0033] Based on the Fourier heat transfer law and the energy conservation equation, the two-dimensional heat conduction equation can be obtained as shown in equation (1):

[0034]

[0035] In the formula: ρ is the density of the soil; C is the apparent specific heat capacity of the subgrade soil, as shown in formula (2); T is the temperature at any point in the soil; λ is the apparent thermal conductivity of the soil, as shown in formula (3); t is time; (x, y) is coordinate point.

[0036] Considering that the specific heat capacity and thermal conductivity of the soil during the freezing and thawing process are directly related to the freezing state of the soil, and the specific heat capacity of the soil will be affected by the phase change o...

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Abstract

The invention discloses a permafrost subgrade structure based on a hydrothermal phase change principle and a construction method thereof. The permafrost subgrade structure comprises a permafrost subgrade; a hard insulation board is arranged in the permafrost subgrade along the laying direction; a plurality of water gratings are arranged in the hard insulation board; and each water grating is filled with water. The method comprises the following steps: (1) laying a lower-layer permafrost subgrade; (2) prefabricating a hard insulation board; (3) laying the prefabricated hard insulation board above the lower-layer permafrost subgrade; and (4) laying an upper-layer permafrost subgrade above the hard insulation board. The active permafrost subgrade cooling method can maintain the thermal stability of permafrost subgrade for a long time.

Description

Technical field: [0001] The invention relates to a permafrost subgrade structure and a construction method thereof, in particular to a permafrost subgrade structure based on the principle of hydrothermal phase transition and a construction method thereof. Background technique: [0002] Permafrost is rock and soil with a temperature below 0°C and contains ice. Frozen soil can be divided into short-term frozen soil, seasonal frozen soil and permafrost according to the length of its existence. Among them, permafrost accounts for about 21.5% of my country's land area, mainly distributed in my country's Qinghai-Tibet Plateau, western high mountains, and northeast Greater Khingan Mountains. In recent years, with the implementation of my country's Western Development Strategy, the strategy of revitalizing the old industrial base in Northeast China, and the Belt and Road Initiative, many existing projects need to be repaired, and many newly planned projects need to be constructed i...

Claims

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Application Information

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IPC IPC(8): E01C3/06
CPCE01C3/06
Inventor 王永涛徐湘田范彩霞邵帅曹阳
Owner INNER MONGOLIA UNIVERSITY
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