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A long-term durable and stable road yard pavement structure layer and its construction method

A technology of structural layer and stable layer, which is applied to cohesive pavement paved on site, roads, roads, etc., can solve problems such as poor coordination deformation ability, large differential settlement of soil foundation, and aggravated crack width, so as to reduce maintenance costs, Ease of construction and reduction of adverse effects

Active Publication Date: 2015-11-25
CCCC FOURTH HARBOR ENG INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the existing engineering practice, the design of pavement structural layer is often more rigid than flexible, that is, the rigidity of the structural layer can meet or even exceed the load application requirements, but the ability to coordinate deformation is poor, especially in soft soil foundations with large settlement Above, the load transmitted from the pavement structure layer acts on the soil foundation, causing the soil foundation to settle, especially because of the inhomogeneity of the load, resulting in a large difference in the settlement of the soil foundation, generating tensile stress in the stable layer, making the pavement structure layer Cracks, and then under the action of objective factors such as water seepage or temperature, the width of the cracks increases, and gradually develops subsidence, damage and other diseases. Similar engineering cases are not uncommon on deep soft soil foundations in coastal areas

Method used

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  • A long-term durable and stable road yard pavement structure layer and its construction method
  • A long-term durable and stable road yard pavement structure layer and its construction method
  • A long-term durable and stable road yard pavement structure layer and its construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, follow the steps below to implement:

[0028] (1) To level the site, if necessary, general tamping should be used to compact the ground surface during the process of leveling the site.

[0029] (2) Lay a layer of sand cushion 2 with a thickness of about 10cm on the soil foundation 1, and the sand cushion 2 is medium-fine sand.

[0030] (3) Lay a graded crushed stone layer 3 on the sand cushion layer 2 as the subbase.

[0031] (4) Set the flexible structural layer 6 on the flat subbase. The flexible structural layer 6 adopts geogrid. When laying, the geogrid is arranged parallel to the axis of the embankment, that is, the laying direction of the geogrid is parallel to the center line of the subgrade. When paving, it should be straightened and smooth, and it should be close to the underlying layer without twisting, folding or overlapping. Geogrids are spliced ​​along the longitudinal direction using the lap joint method, each lap width (longi...

Embodiment 2

[0034] Such as figure 2 As shown, follow the steps below to implement:

[0035] (1) To level the site, if necessary, general tamping should be used to compact the ground surface during the process of leveling the site.

[0036] (2) Lay a layer of sand cushion 2 with a thickness of about 10cm on the soil foundation 1, and the sand cushion 2 is medium-fine sand.

[0037] (3) Lay a graded crushed stone layer 3 on the sand cushion layer 2 as the subbase.

[0038] (4) Lay a cement stabilization layer with a certain thickness (generally 20cm) on the subbase. Then set a flexible structural layer 6 above the paved cement stabilization layer. The flexible structural layer adopts steel mesh. When laying, the steel mesh is arranged parallel to the axis of the embankment, that is, the laying direction is parallel to the center line of the subgrade, and it should be straightened when paving. , smooth, close to the underlying layer, without twisting, wrinkling, or overlapping. The long...

Embodiment 3

[0041] Such as image 3 As shown, follow the steps below to implement:

[0042] (1) To level the site, if necessary, general tamping should be used to compact the ground surface during the process of leveling the site. .

[0043] (2) Lay a layer of sand cushion 2 with a thickness of about 10cm on the soil foundation 1, and the sand cushion 2 is medium-fine sand.

[0044] (3) Lay a graded crushed stone layer 3 on the sand cushion layer 2 as the subbase.

[0045] (4) Lay a cement stabilization layer on the subbase.

[0046] A flexible structural layer 6 is arranged above the cement stabilization layer. The flexible structural layer adopts geotextile and geogrid. When laying, the geotextile and geogrid are arranged parallel to the axis of the embankment, that is, the laying direction is parallel to the center line of the subgrade. When paving, it should be straightened and smooth, and it should be close to the underlying layer. , without twisting, wrinkling, or overlapping. ...

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Abstract

The invention discloses a long-term and durable stably-used road yard pavement structure layer which structurally comprises a sand cushion layer, a broken stone subbase layer, a stabilization layer and a surface layer, which are arranged on a soil base from bottom to top sequentially, wherein the stabilization layer consists of a cement stabilization layer and a flexible structure layer that is made of a geosynthetic material having a reinforcement function. According to the pavement structure layer, the sand cushion layer with certain thickness is paved between the soil base and the graded broken stone cushion layer, so that a load transferred by the subbase layer can be diffused conveniently for reducing the deformation of the soil base and improving the differential deformation resistance of the pavement structure layer; adverse effects of post-construction settlement or differential settlement on the pavement structure layer are reduced to a great extent; the long-term and durable stability of a road yard is improved; the maintenance cost during operation is lowered greatly; and the pavement structure layer is simple and easy to construct, and is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical fields of port engineering, highway engineering, etc., and in particular relates to the engineering technology of design and construction of pavement structures of roads or storage yards on soft soil foundations. Background technique [0002] Ports, wharves and highways are important infrastructures of the national economy. With the development of the economy, the logistics industry has developed rapidly in my country and the world. In recent years, large-scale construction of port areas has been carried out on soft soil foundations formed by dredging and filling silt. Work on roads and yards is increasing day by day. Due to objective factors such as foundation treatment or improper design of stable layer and surface layer, roads and storage yards on soft foundations often suffer from subsidence, cracking and other diseases due to post-construction settlement or excessive differential settlement, making these infra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/32E01C9/00E01C3/04
Inventor 董志良陈伟东陈平山夏得亮王永磊黄俊文罗彦周红星彭海华刘运兰鲍树峰唐建亚
Owner CCCC FOURTH HARBOR ENG INST
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