Hydrothermal closed frost heaving and frost boiling prevention high-strength highway subgrade structure and construction method

A closed, anti-frost heave technology, applied in roads, roads, buildings, etc., can solve the problems of road subgrade frost heave, uneven settlement, insufficient strength, etc., to reduce uneven settlement, reduce heat loss, and reduce water content. rate effect

Active Publication Date: 2019-11-22
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure can solve the problems of frost heaving, muddying, uneven settlement and insufficient strength of highway subgrade in permafrost areas to a certain extent, and has good engineering application prospects

Method used

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  • Hydrothermal closed frost heaving and frost boiling prevention high-strength highway subgrade structure and construction method
  • Hydrothermal closed frost heaving and frost boiling prevention high-strength highway subgrade structure and construction method
  • Hydrothermal closed frost heaving and frost boiling prevention high-strength highway subgrade structure and construction method

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Experimental program
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Embodiment

[0044] refer to Figure 1 to Figure 2 ,like Figure 1 to Figure 2 Shown, the specific embodiment of the present invention is as follows:

[0045] A hydrothermally enclosed high-strength highway subgrade structure with anti-frost heaving and slurrying. The overall longitudinal section of the subgrade structure is trapezoidal. The lowest layer of the subgrade structure is a crushed stone layer 1. A gravel protection cushion layer 12, the first waterproof geotextile layer 11, the first gravel protective layer 10, the first gravel protective layer 10 horizontal plane is provided with a geogrid layer 6, the top of the geogrid layer 6 and The second gravel cushion layer 5, the second waterproof geotextile layer 3, the second gravel protection layer 4, and the filling soil layer 9 are arranged sequentially from bottom to top on both sides; the horizontal direction of the filling soil layer 9 is provided with asphalt Surface 8.

[0046] Further, the filling layer 9 on both sides of...

experiment example

[0064] refer to Figure 3 to Figure 7 ,like Figure 3 to Figure 7 Shown, the concrete embodiment of the experimental example of the present invention is as follows:

[0065] 1. Model experimental equipment:

[0066] A low-temperature model box with a size of 3.5m×2.0m×2.2m, a high-low temperature constant temperature liquid bath circulation device, a dial indicator, a temperature sensor and a soil moisture collector are used.

[0067] 2. Model filling process:

[0068] (1) Soil sample preparation

[0069] Select Lanzhou loess as the test soil sample. Before the experiment, sprinkle water evenly on the soil sample, cover it with a plastic film and let it stand for 3 days to make the moisture distribution in the test soil sample even;

[0070] (2) Subgrade filling

[0071] Adopt toughened glass to separate the low-temperature model box into two parts of the same size, one part is filled with the roadbed model of the present invention, that is, the new roadbed in the accompa...

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Abstract

The invention discloses a hydrothermal closed frost heaving and frost boiling prevention high-strength highway subgrade structure and a construction method. The overall longitudinal section of the subgrade structure is trapezoidal. The lowermost layer of the subgrade structure is a rubble layer. A first gravel protection pad layer, a first waterproof geotextile layer and a first gravel protectionlayer are sequentially arranged at the upper part and two sides of the rubble layer; a geogrid layer is arranged on the horizontal plane of the first gravel protection layer, and a second gravel protection pad layer, a second waterproof geotextile layer, a second gravel protection layer and a soil filling layer are sequentially arranged on the upper portion and the two sides of the geogrid layer from bottom to top; an asphalt surface layer is arranged in the horizontal direction of the soil filling layer. The subgrade structure is stable in structure, high in frost heaving and frost boiling prevention capacity and suitable for building of roads in frozen soil areas.

Description

technical field [0001] The invention relates to the technical field of highway subgrade structures, in particular to a hydrothermally closed anti-frost heaving and slurrying high-strength highway subgrade structure and a construction method. Background technique [0002] Permafrost is soil or rock with a temperature below 0°C and contains ice. According to the length of time the soil freezes, it can be divided into two main types: permafrost and seasonal frozen soil. Permafrost refers to the soil or rocks that have been frozen for two years or more, and the distribution area on the earth is about 35×10 6 Km 2 , accounting for 20% of the total land area. The area of ​​permafrost regions in my country accounts for 21.5% of the total land area, making it the third largest country in the world. The Himalayas, and some mountainous areas in the east, such as Changbai Mountain, Huanggangliang Mountain, Wutai Mountain, Taibai Mountain and other regions. Seasonally frozen soil ref...

Claims

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Application Information

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IPC IPC(8): E01C3/00E01C3/04E01C3/06
CPCE01C3/00E01C3/04E01C3/06Y02A30/60
Inventor 刘德仁杨佳乐杨成王旭蒋代军
Owner LANZHOU JIAOTONG UNIV
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