Method for reducing melting settlement deformation of permafrost region during highway operation

A technology for permafrost areas and highways, which is applied in the directions of roads, roads, climate change adaptation, etc., can solve the problems of uneven deformation of the road surface, lack of vertical force of continuous horizontal reinforcement elements, and uneven downward movement of the upper limit of permafrost. Achieve the effect of eliminating repair costs, reducing road operating costs, and ensuring high reliability

Active Publication Date: 2020-08-14
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • 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 ar

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  • Method for reducing melting settlement deformation of permafrost region during highway operation

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Example Embodiment

[0015] Specific implementation mode 1: Combination figure 1 To explain this embodiment, a method of this embodiment to reduce the melting and settlement deformation during the operation of roads in permafrost regions is specifically carried out as follows:

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

[0017] 2. From the bottom of the road cut to the upper limit of the permafrost layer, a square grid is used for drilling construction; the drilling construction includes vertical drilling and inclined drilling. Inclined drilling is set on both sides of the road along the direction of the road. Set up vertical drilling;

[0018] 3. Insert steel casing pipes into vertical boreholes and inclined boreholes respectively, fill the lower part of the steel casing with sand and fill the upper part with concrete to form a pile 5;

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

[0020] 5. Laying a geosynthetic reinforced layer 4 on top of the grave...

Example Embodiment

[0027] Specific embodiment two: this embodiment is different from specific embodiment one in that the depth of excavation in step one is not less than the standard freezing depth. Others are the same as the first embodiment.

Example Embodiment

[0028] Specific embodiment three: This embodiment is different from specific embodiment one or two in that the pile distance for the drilling construction in step two is 2 to 2.5 m, and the hole diameter is 0.35 to 0.45 m. Others are the same as the first or second embodiment.

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Abstract

The invention relates to the technical field of road engineering and geotechnical engineering, and particularly relates to a method for reducing melting settlement deformation of a permafrost region during highway operation. The invention aims at solving a problem that an existing method for reducing melting settlement deformation of the permafrost region during highway operation lacks continuoushorizontal reinforcement elements to share a vertical acting force of vehicle loads, and the problems that external factors can cause uneven downward movement of a permafrost upper limit under a roadbed, and uneven deformation of a road surface can be caused. The method comprises the steps that carrying out cutting excavation on a natural soil body; carrying out vertical drilling and inclined holedrilling; running a sleeve; backfilling a broken stone buffer layer; laying a geosynthetics reinforced layer; and backfilling coarse-grained soil, laying a pavement structure layer, and then carryingout roadbed construction. The method is used for reducing melting settlement deformation of the permafrost region during highway operation.

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...

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Application Information

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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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