A method to reduce thawing settlement deformation during highway operation in permafrost regions

A technology in permafrost regions and highways, applied in roads, roads, climate change adaptation, etc., can solve problems such as uneven deformation of the road surface, lack of continuous horizontal reinforcement elements, vertical force, and uneven downward movement of the upper limit of frozen soil. Achieve the effects of eliminating repair costs, reducing road operating costs, and ensuring high reliability

Active Publication Date: 2021-12-10
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the lack of continuous horizontal reinforcement elements to share the vertical force of the vehicle load in the existing methods for reducing thawing settlement deformation during highway operation in permafrost areas; and external factors will cause the upper limit of permafrost under the subgrade to be uneven. will cause the pavement on it to continue to deform unevenly, and provide a method to reduce thawing settlement deformation during highway operation in permafrost regions

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  • A method to reduce thawing settlement deformation during highway operation in permafrost regions

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specific Embodiment approach 1

[0015] Specific implementation mode one: combine figure 1 Describe this embodiment, a method for reducing thawing and settlement deformation during highway operation in permafrost regions in this embodiment is specifically carried out in the following steps:

[0016] 1. Excavate the natural soil to obtain road cuttings;

[0017] 2. Between the bottom of the cutting and the upper limit position 6 of the permafrost layer, the drilling construction is carried out with a square grid; the drilling construction includes vertical drilling and inclined drilling, and inclined drilling is set on both sides along the direction of the road. Set vertical drilling;

[0018] 3. Put steel sleeves into the vertical borehole and the inclined borehole respectively, fill the lower part of the steel sleeve with sand, and fill the upper part with concrete to form the pile body 5;

[0019] 4. Backfill a layer of gravel buffer layer 3 at the bottom of the cutting;

[0020] Five, lay geosynthetics ...

specific Embodiment approach 2

[0027] Embodiment 2: This embodiment differs from Embodiment 1 in that: the excavation depth in step 1 is not less than the standard freezing depth. Others are the same as the first embodiment.

specific Embodiment approach 3

[0028] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the pile distance of the drilling construction described in step 2 is 2-2.5m, and the hole diameter is 0.35-0.45m. Others are the same as those in Embodiment 1 or 2.

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Abstract

A method for reducing thawing settlement deformation during highway operation in permafrost regions. The invention relates to the technical fields of road engineering and geotechnical engineering, in particular to a method for reducing thawing settlement deformation during highway operation in permafrost regions. The purpose of the present invention is to solve the lack of continuous horizontal reinforcement elements to share the vertical force of the vehicle load in the existing methods for reducing thawing settlement deformation during highway operation in permafrost areas; and external factors will cause the upper limit of permafrost under the subgrade to be uneven. If it is shifted, it will cause the problem of uneven deformation of the road surface on it. Methods: Excavate cuttings on natural soil; drill vertical and inclined boreholes; run casing; backfill gravel buffer layer; lay geosynthetic material reinforcement layer; The invention is used for reducing thawing settlement deformation during highway operation in permafrost regions.

Description

technical field [0001] The invention relates to the technical fields of road engineering and geotechnical engineering, in particular to a method for reducing melting and settlement deformation during highway operation in permafrost regions. Background technique [0002] China is the third largest country with permafrost in the world, and the total permafrost area accounts for 22.4% of China's land area. Both the Qinghai-Tibet Highway and the Mobei Highway in Heilongjiang have long sections built on permafrost, and a large number of road deformations occurred during operation. It is well known that pavement deformation is usually caused by the reduction of the bearing capacity of the foundation soil of the subgrade during operation. This is due to various physical and geological processes, including the melting of permafrost. Due to the ambiguous location of the permafrost cap during the thawing process, the foundations of subgrades containing permafrost caps may suffer com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C3/06
CPCE01C3/06Y02A30/60
Inventor 赵茂才古德俩夫采夫·谢尔盖
Owner HARBIN INST OF TECH
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