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High-latitude forest island-shaped frozen soil roadbed structure and construction method

A high-latitude, forest-area technology, applied in the field of traffic engineering, can solve problems such as increasing the cost of construction projects, affecting the use effect and life of the project, and achieving the effects of reducing underground temperature, improving safety and stability, and reducing the melting range

Pending Publication Date: 2021-08-13
BEIJING MUNICIPAL ROAD & BRIDGE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only greatly increases the construction cost, but also seriously affects the use effect and life of the project.

Method used

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  • High-latitude forest island-shaped frozen soil roadbed structure and construction method

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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, an island-shaped permafrost roadbed structure in a high-latitude forest area, which is sequentially composed of a gravel stamping layer 7, a composite geomembrane 6, a gravel layer 5, a piece of stone layer 4, a permeable geotextile 3, Thick gravel cushion 2. The gravel stamping layer 7 of 50 cm is impacted and rolled to below the horizon, the thickness of the gravel layer 6 is 50 cm, the thickness of the flake stone layer 4 is 1 m, the particle size is 15-25 cm, and the minimum side length should be greater than 15 cm. The ratio should not be greater than 3, the strength of the fragment stone is greater than 20MPa, the porosity is not less than 20%, and the thickness of the thick gravel cushion 2 is 80cm.

[0029] Both sides of the island-shaped permafrost subgrade in high-latitude forest areas are equipped with thermal rod structures 8, including evaporation section 9 and condensation section 10. The length of condensation section 10 of the...

Embodiment 2

[0032] Such as figure 1 Shown, the construction method of a kind of high-latitude forest area island shape permafrost subgrade structure described in embodiment 1 is realized by the following steps:

[0033] a. After clearing tree roots and cutting off the weeds above the ground within the subgrade range, fill in a 50cm gravel stamping layer 7 and impact and roll it below the horizon, lay a composite geomembrane 6 above the gravel stamping layer, and then fill in 50cm of gravel Layer 5, its maximum particle size shall not be larger than 5cm.

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Abstract

The invention discloses a high-latitude forest region island-shaped frozen soil roadbed structure and a construction method, and the construction method comprises the following steps: impacting and rolling filled sheet and block stones with the thickness of 1m below a horizon, filling a sheet and block stone layer with the thickness of 50cm above the sheet and block stones, then paving two pieces of cloth and one film, then filling a gravel lower cushion layer with the thickness of 50cm, filling a gravel upper cushion layer with the thickness of 1 m is filled after inverted filter geotechnical cloth is laid on the top layer of the roadbed, setting a row of hot bar structures on each of the two sides of the roadbed, and setting a slope protection channel and a drainage ditch. The water-heat exchange balance condition in the frozen soil roadbed in the high-latitude forest region can be adjusted and maintained, the frozen soil melting amplitude and uneven deformation of the frozen soil roadbed are reduced, the stability of the roadbed structure is improved, the service life of the road is prolonged, and the later maintenance cost of the road is reduced.

Description

technical field [0001] The invention belongs to the technical field of traffic engineering, and in particular relates to an island-shaped frozen soil subgrade structure and a construction method in a high-latitude forest area. Background technique [0002] Permafrost refers to various rocks and soils that are below zero degrees Celsius and contain ice. Due to the presence of ice and unfrozen water, its properties are extremely complex and sensitive to temperature. my country is the third largest frozen country in the world. 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 and Lesser Khingan Mountains. [0003] Among them, most of the Greater and Lesser Khingan Mountains are high-latitude forest areas, with dense vegetation, abundant precipitation, well-developed groundwater, and mostly island-like distribution of permafrost. Therefore, the cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/00E01C3/06E02D3/00
CPCE01C3/00E01C3/06E02D3/00Y02A30/60
Inventor 孙西濛翟相飞王丽群马瑞赵利东许鲁京宋伟瑞王海军赵海海宋敏高政
Owner BEIJING MUNICIPAL ROAD & BRIDGE
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