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Novel roadbed structure for phreatic high inland sulphate salty soil

A saline soil and water level technology, applied in the direction of roads, roads, climate change adaptation, etc., can solve problems such as subsidence, salt heaving, adverse effects on the surrounding environment, etc. The effect of reducing salt migration

Inactive Publication Date: 2013-04-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Raising the height of the subgrade can control the groundwater level below the salt-frost heave line, and the bearing layer of the pavement and subgrade above the influence range of capillary water, but it will cause a large amount of excavation and filling, which is not suitable for urban road construction and may affect the surrounding area. adverse impact on the environment; when the groundwater level rises, the original design height may not be suitable, resulting in the occurrence of salt heaving and melting subsidence

Method used

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  • Novel roadbed structure for phreatic high inland sulphate salty soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Add 1m to both sides of the designed pavement width to remove the salt crust. The excavation depth of the central axis is controlled by reducing the depth of groundwater by 30cm. Rolling is carried out under optimal water content conditions to achieve maximum compaction.

[0018] (2) Excavate a 50×50 cross-section groove downward at the central axis of the base, and then build a U-shaped cross-section concrete trench with a height of 30cm, a width of 30cm, and a thickness of 5cm or lay a 30×30 prefabricated U-shaped pipe. The longitudinal slope is uniform and not less than 1%, and both sides are backfilled to the notch, and the drainage pipe is covered with a permeable board.

[0019] (3) Lay anti-filter geotextiles on the surface of the base, and then lay 20cm, uniformly graded sand and gravel with a particle size of 1-50mm at one time and compact them to form an 8° inclination to the central drainage ditch, and wrap the sides with gravel soil To the excavation si...

Embodiment 2

[0024] (1) Add 1m to both sides of the designed pavement width to remove the salt crust. The excavation depth of the central axis is controlled by reducing the buried depth of groundwater by 30cm. Rolling is carried out under optimal water content conditions to achieve maximum compaction.

[0025] (2) Excavate a 50×50 cross-section groove downward at the central axis of the base, and then build a U-shaped cross-section concrete trench with a height of 30cm, a width of 30cm, and a thickness of 5cm or lay a 30×30 prefabricated U-shaped pipe. The consistent longitudinal slope is not less than 1%, backfill to the notch on both sides, and cover the drainage ditch with a permeable board.

[0026] (3) Lay anti-filter geotextiles on the surface of the base, and then lay 30cm, uniformly graded sand and gravel with a particle size of 1-50mm at one time and compact them to form a 7° inclination to the central drainage ditch, with gravel soil on both sides. To the sideline of the excavat...

Embodiment 3

[0031] (1) Add 1m to both sides of the designed pavement width to remove the salt crust. The excavation depth of the central axis is controlled by reducing the buried depth of groundwater by 50cm. Rolling is carried out under optimal water content conditions to achieve maximum compaction.

[0032] (2) Excavate a 50×50 cross-section groove downward at the central axis of the base, and then build a U-shaped cross-section concrete trench with a height of 30cm, a width of 30cm, and a thickness of 5cm or lay a 30×30 prefabricated U-shaped pipe. The consistent longitudinal slope is not less than 1%, backfill to the notch on both sides, and cover the drainage ditch (pipe) with a permeable sand barrier.

[0033] (3) Lay sand and gravel with a total thickness of 60cm and a uniform particle size of 1-50mm on the surface of the base twice and compact it to form a 5° inclination to the central drainage ditch, and wrap the edges with gravel soil on both sides until the excavation sideline...

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Abstract

The invention discloses a novel roadbed structure for phreatic high inland sulphate salty soil. The structure sequentially comprises an embankment, a drainage device, a separating-discharging saline layer, a lower roadbed layer, an insulating separation layer and an upper roadbed layer from bottom to top. The drainage device and the separating-discharging saline layer are arranged above the phreatic line and below the salt expansion line. The separating-discharging saline layer is arranged in the embankment, wherein the lower bottom face is 30-50cm higher than the phreatic line. The drainage device is respectively arranged at the axle wire of the embankment and the embankment below the separating-discharging saline layer. The separating-discharging saline layers on both sides of the axle wire incline downward in the middle at 5-8 degrees. The lower roadbed layer is 30-50cm thick, the insulating separation layer is 30-50cm thick, and the upper roadbed layer is 20-30cm thick. According to the roadbed structure provided by the invention, the roadbed is dried and moderately wet to prevent heat and water of the lower roadbed from loss due to evaporation, so that the temperature change amplitude of the roadbed is reduced, the temperature of the roadbed is stable, saline transfer is reduced, the roadbed elevation height can be reduced, and the digging and filling amount for roadbed pavement can be reduced.

Description

technical field [0001] The invention relates to a novel roadbed structure used for inland sulfuric acid saline soil with high groundwater level. Background technique [0002] Saline soil is a general term for soils with different degrees of salinization. In highway engineering, it generally refers to the soil with an average soluble salt content greater than 0.3% in the soil within 1.0m below the surface. According to the regional distribution, saline soil can be divided into coastal saline soil, inland saline soil and alluvial plain saline soil; according to the nature of salt content, it can be divided into (sub)chlorine saline soil, (sub)sulfuric acid saline soil, and carbonate saline soil five categories. Generally speaking, engineering diseases of saline soil include salt heaving, subsidence and corrosion of engineering bodies and materials. Inland sulfate saline soil is formed by river water rich in sulfate and groundwater flowing from high places to lowlands. Under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/06
CPCY02A30/60
Inventor 彭述权陈再胡毅夫樊玲李寿宁
Owner CENT SOUTH UNIV
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