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Permafrost region railway roadbed anti-frost heaving structure body and paving method thereof

A technology for railway subgrades and permafrost areas, applied to roads, buildings, tracks, etc., can solve problems such as excessive water content, and achieve the effect of enhancing drainage capacity

Inactive Publication Date: 2019-05-10
中建新疆建工土木工程有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above deficiencies, the technical problem to be solved by the present invention is to provide an anti-frost heaving structure and paving method for railway subgrades in permafrost regions, which solves the problems of subgrade surface water seepage and excessive water content of subgrade beds , fundamentally prevent the occurrence of frost heaving and thawing

Method used

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  • Permafrost region railway roadbed anti-frost heaving structure body and paving method thereof
  • Permafrost region railway roadbed anti-frost heaving structure body and paving method thereof
  • Permafrost region railway roadbed anti-frost heaving structure body and paving method thereof

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Embodiment 1

[0036] Such as Figure 1 to Figure 5 Commonly shown, an anti-frost structure for railway subgrades in permafrost regions, including subgrades and embankment slopes on both sides of the subgrade. The subgrade is filled with 5% cement graded gravel from the surface layer of the subgrade bed to the bottom layer Layer 1, medium-coarse sand layer 2, a layer of two-cloth-one-membrane impermeable geotextile 3 sandwiched between the medium-coarse sand layer 2, non-frost heave A and B group soil layer 4; Water seepage blind ditch 6, each seepage blind ditch 6 is laid with seepage pipe 7, specifically set water seepage blind ditch 6 under the platform next to side ditch 5, the elevation of the bottom of the seepage blind ditch pipe is not greater than the elevation of side ditch platform 10 - 1.3 times the maximum freezing Depth - pipe diameter - 0.25m.

[0037] The embankment slope is paved with seepage blind pipes for drainage.

[0038] The thickness of 5% cement graded gravel layer...

Embodiment 2

[0044] Such as Figure 1 to Figure 5 Commonly shown, the paving method of the anti-frost heave structure of the railway embankment in the permafrost region comprises the following steps:

[0045] Step 1. Obtain the geology and water system of the construction area;

[0046] Step 2: Replace the subgrade in the construction area from bottom to top with non-frost heave A and B soil, medium coarse sand and 5% cement graded gravel, and lay impermeable geotextile 3 in the medium coarse sand; 5 of them % Cement graded crushed stones, the content of needle-shaped crushed stones in the particles should not exceed 20%, the content of soft and easily broken crushed stones should not exceed 10%, and the content of clay clusters and organic matter should not exceed 2%. The uniformity coefficient U=D60 / D10 is not less than 15, and the mass percentage of particles below 0.02mm is not more than 3%. At the same time, the content of the particle size d≤0.075mm is not more than 5% (weight rati...

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Abstract

The invention discloses a permafrost region railway roadbed anti-frost heaving structure body and a paving method thereof. The permafrost region railway roadbed anti-frost heaving structure body comprises a roadbed and embankment slopes arranged on the two sides of the roadbed, the roadbed is sequentially filled with a 5% cement graded with crushed stone layer, medium coarse sand layers, a layer of impermeable geotextile sandwiched between the medium coarse sand layers, a non-frost heaving A group soil layer and a non-frost heaving B group soil layer from bed surface layer to the bed bottom layer; seepage blind ditches are laid on both sides of the bed bottom layer, and seepage pipes are laid in the seepage blind ditches. By adopting the paving method of the permafrost region railway roadbed anti-frost heaving structure body, the paved anti-frost heaving structure body realizes upper sealing and lower drainage, the bed surface layer adopts the 5% cement graded with crushed stone for replacement and filling so as to prevent surface water from infiltrating from the bed surface layer, meanwhile, the water seepage blind ditches are additionally formed in both sides of the bed bottom layer, and thus the drainage capacity of the bed of the roadbed is enhanced. Therefore, the permafrost region railway roadbed anti-frost heaving structure body and the paving method thereof effectivelylead a water source away from the roadbed, it is ensured that the permafrost roadbed and cutting are not eroded by ground water and underground water, and the generation of frost heaving and thawing settlement diseases of the roadbed in permafrost regions is effectively prevented and controlled.

Description

technical field [0001] The invention relates to the technical field of railway embankment construction, in particular to an anti-frost heave structure and paving method for railway embankments in permafrost regions. Background technique [0002] With the rapid development of my country's railway construction, in recent years, railway projects have gradually expanded to high-latitude and high-cold technically difficult areas. Frost heaving, thawing and other bad roadbed diseases frequently occur in the construction of railways in alpine permafrost regions. The main reason for subgrade frost heaving is that the subgrade water is affected by low temperature in winter, and the water with higher temperature transfers to the lower temperature soil layer. Therefore, how to take effective measures to prevent frost heave disease and how to deal with frost heave disease in the newly built railway in this area is a technical problem in the construction of railways in alpine areas. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01B2/00
Inventor 张海闫国庆杨艺杰
Owner 中建新疆建工土木工程有限公司
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