CN112900177A - Composite geomembrane salt-separating water-blocking partition layer structure - Google Patents
Composite geomembrane salt-separating water-blocking partition layer structure Download PDFInfo
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- CN112900177A CN112900177A CN202110141530.8A CN202110141530A CN112900177A CN 112900177 A CN112900177 A CN 112900177A CN 202110141530 A CN202110141530 A CN 202110141530A CN 112900177 A CN112900177 A CN 112900177A
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- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 238000005192 partition Methods 0.000 title abstract description 37
- 229920003023 plastic Polymers 0.000 claims abstract description 28
- 239000004033 plastic Substances 0.000 claims abstract description 28
- 239000004746 geotextile Substances 0.000 claims abstract description 23
- 239000004744 fabric Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 150000003839 salts Chemical class 0.000 claims abstract description 17
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 10
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 10
- 239000012528 membrane Substances 0.000 claims abstract description 9
- 239000012209 synthetic fiber Substances 0.000 claims abstract description 4
- 229920002994 synthetic fiber Polymers 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims 5
- 239000011780 sodium chloride Substances 0.000 abstract description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 12
- 201000010099 disease Diseases 0.000 abstract description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 abstract description 2
- 230000000740 bleeding effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000000192 social effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 44
- 239000002689 soil Substances 0.000 description 25
- 239000004576 sand Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 6
- 239000011241 protective layer Substances 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Architecture (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Road Paving Structures (AREA)
Abstract
The composite geomembrane salt-separating water-blocking partition layer structure related by the invention adopts the combination of two cloth films and one plastic drainage plate to separate water and salt which migrate upwards and effectively discharge the water and salt outside the roadbed, thereby preventing diseases such as salt expansion, slurry overflow and mud bleeding of the roadbed, greatly improving the overall stability of the roadbed and better reducing the height of the roadbed. The two cloth-one film is a synthetic fiber waterproof cloth fabric formed by two layers of filament woven cloth and one layer of High Density Polyethylene (HDPE) geomembrane. The plastic drainage plate is formed by wrapping non-woven geotextile (filter membrane) outside continuous plastic core plates with different cross-sectional shapes. The composite geomembrane salt-separating water-blocking partition layer structure is simple in structure, easy to operate, convenient to construct and low in manufacturing cost, has better economic benefits and good social effects on the treatment of the highway subgrade in the saline land area, and has wide application prospects in the fields of highways, railways, civil aviation airport runways, oil pipelines and the like.
Description
Technical Field
The invention relates to highway subgrade engineering, in particular to a roadbed replacement and filling partition layer structure in the highway subgrade engineering in a saline soil area.
Background
The composite geomembrane is a synthetic fiber waterproof cloth-shaped fabric formed by combining two cloth-one films and a plastic drainage plate, wherein the two cloth-one films are formed by weaving two layers of filament yarns into cloth and sandwiching one layer of polyethylene (HDPE) geomembrane. The plastic drainage plate is formed by wrapping non-woven geotextile (filter membrane) outside continuous plastic core plates with different cross-sectional shapes.
The saline soil as a special roadbed filling has a plurality of engineering hidden dangers: under the repeated crystallization action of sulfate in the saline soil, the volume change is caused, the soil body structure is damaged, and the engineering diseases such as subgrade settlement, slope collapse, pavement stability reduction and the like are caused due to corrosion, salt expansion, frost heaving, slurry turning and the like; the saline soil contains a large amount of sulfate and chloride, has great corrosivity on bridge and culvert structures, and seriously threatens the durability and the safety of the bridge and culvert structures. The highway engineering is a strip engineering, the spanning range is wide, and the geological conditions of the saline soil area are complex and changeable.
The arrangement of the partition layer fully meets the actual engineering requirements, the migration rule of capillary water in different embankment fillers is researched according to actual factors such as embankment fillers of specific road sections, the height of a roadbed, the distribution of underground water and the like, and the reasonable partition layer is arranged according to the migration rule. Saline soil district highway subgrade sets up the partition layer and can effectively block capillary water and carry the salinity and rise, prevents that moisture and salinity from getting into lower road bed or even upper road bed to avoid road bed or road surface to suffer destruction.
In order to prevent roadbed salinization and secondary salinization, the prior art comprises the processes of improving the height of a roadbed, arranging a water-permeable soil partition layer, an asphalt mortar partition layer, a geotechnical fiber material partition layer and the like. The different forms of partition layers have a great influence on the overall stability of the roadbed. Therefore, the selection of a reasonable partition layer structure is one of the key factors for ensuring the stability of the roadbed in the saline soil area.
The gravel (crushed) partition layer is suitable for roads more than two levels newly built in areas with high underground water level or strong saline soil with much rainfall. The thickness of the partition layer is preferably 30-50 cm, the maximum particle size of gravel (crushed) is less than 50mm, the content of powder particles is less than 5%, the reverse filter layer is preferably made of geotextile with a penetration function, or medium and coarse sand, the mud content is not more than 3%, and the thickness is 10-15 cm.
The aeolian sand or river sand partition layer is suitable for building and reconstructing roads at the edges of deserts and downstream sections of river channels, which lack gravel materials and are rich in sand. The thickness of the partition layer depends on the conditions of roadbed soil quality, hydrology, geology and the like and the factors of the particle composition of the material of the partition layer and the like, and is determined according to the calculation of the rising height of capillary water, the minimum thickness is not less than 60cm, the content of powder particles in sandy soil is less than 5 percent, and the salt content is in accordance with the specification of 0-0.8 m (thickness of a road bed) of the 7.11.7 level in the table of JTGD30-2015 Highway roadbed design specification. The degree of compaction should comply with the specifications in Table 3.3.4 of JTGD 30-2015. The two sides of the sand soil partition layer should be covered with gravel (sand) soil, and the width of the gravel (sand) soil is not less than 30 cm.
The composite geomembrane partition layer is suitable for building highways above secondary high-grade pavements in medium, strong or over-saline soil areas. It has soft texture, good combination with soil, good toughness and wear resistance. The geotextile in the composite geomembrane is formed by weaving filament yarns and non-woven fabrics and pressing PE plastics at high temperature, has good anti-permeability, corrosion resistance and microbial erosion resistance, and has the characteristics of ageing resistance, freezing resistance and high tensile strength. The composite geomembranes are of various varieties and can be generally divided into two cloth films and one film when used as a partition layer. The two cloth-film partition layers may not be provided with upper and lower protective layers, and the one cloth-film partition layer may be provided with a protective layer only on one side with the film. But the upper part and the lower part of the composite geomembrane partition layer paved in the fine soil are respectively provided with a sand or gravel drainage layer with the thickness not less than 20 cm. The maximum grain diameter of the drainage layer is 60mm, and the content of powder particles is not more than 15%. The bottom embedding depth of the lower drainage layer is larger than the maximum local freezing depth.
The geomembrane partition layer is suitable for newly building or reconstructing roads in strong and over-saline soil areas, wherein the polyethylene impermeable film and the polypropylene drench membrane woven cloth are only suitable for being used in three-level and four-level roads or drainage engineering. The geomembrane partition layer is provided with an upper protective layer and a lower protective layer, the protective layer is made of sand or soil sand containing fine grains, and the content of powder particles is less than 15%. If the partition layer is arranged in coarse-grained soil, the thickness of the protective layer can be 8-10 cm; if it is set in fine soil, the protecting layer can play the role of draining water, and its thickness should be not less than 20 cm.
Although the structure of the partition layer can improve the stability of the roadbed in the saline land area to a certain extent, the structure of the partition layer aims at the specific type of highway engineering, and has the advantages of multiple material varieties, complex process and insignificant salt and water separation effects.
Disclosure of Invention
Aiming at the problems of single performance, insignificant effect and the like of the prior art, the invention provides a novel comprehensive partition layer structure, which aims to effectively partition water and salt which migrate upwards in a form of combining two cloth membranes and a plastic drainage plate and discharge the water and the salt out of a roadbed, thereby greatly improving the overall stability of the roadbed.
The composite geomembrane related by the invention is composed of two cloth membranes and a plastic drainage plate. The plastic drainage plate is transversely arranged, and the filament woven two-cloth one-film composite geotextile is laid on the plastic drainage plate. The two cloth-one film is a synthetic fiber waterproof cloth-shaped fabric formed by two layers of filament woven composite geotextile and one layer of High Density Polyethylene (HDPE) geomembrane; the plastic drainage plate is formed by wrapping non-woven geotextile (filter membrane)) outside continuous plastic core plates with different cross-sectional shapes, and the capillary water of the subgrade underground with salt is guided to the grooves along the inclined plane and is discharged to the outside.
The model of the plastic drainage plate is SPB-B-FF-250-25, the product code is SPB, B is the beating depth and the flat-laying length, and the values are as follows: the width is 250mm and the thickness is 25 mm.
The filament woven composite geotextile is in a model number of PP50-4-250, wherein PP is polypropylene and has the following values: the radial nominal breaking strength is 50kN/m, the breadth is 4-6m, and the mass per unit area is 250 g/square meter; the thickness of the HDPE high-density polyethylene hot-pressing composite geomembrane is 3-4 mm; the unit area mass of the composite geotextile is more than or equal to 900 g/square meter.
The arrangement of the composite geomembrane salt-separating water-blocking partition layer structure comprises the following steps:
Inspecting the foundation bed and removing various impurities which hinder the laying of the composite geotextile, wherein in order to facilitate the drainage of water and salt, the roadbed is provided with a bidirectional transverse slope not less than 2 percent but not more than 5 percent at most;
The plastic drainage plates are arranged at intervals of 2.5 meters along the longitudinal direction of the roadbed, penetrate through the whole road width and extend out of the roadbed by a plurality of meters, so that the plastic drainage plates can be conveniently implemented together with the edge-covered geotextile and the comprehensive drainage system.
And (3) laying filament woven two-cloth one-film composite geotextile on the plastic drainage plate. The transverse lap joint between each two frames is not less than 20cm, and a welding form and a welding line are adopted. After one piece of cloth is laid, the longitudinal connection also adopts welding, the lap joint length is not less than 50cm, and two welding lines are formed.
Compared with the prior art, the invention has the beneficial effects that: the novel comprehensive partition layer structure can be applied to various levels of highways with different salinization degrees by combining the two cloth films and the plastic drainage plates, and the composite geotextile has the characteristics of high strength, good ductility, large deformation modulus, acid and alkali resistance, corrosion resistance, aging resistance, good seepage resistance, softness, easiness in processing and the like, and meets the requirements of seepage prevention, water resistance, salt separation and the like in roadbed engineering. The structure of the partition layer is simple in arrangement, easy to operate and convenient to construct, has important practical significance on the treatment of the highway subgrade in the saline soil area, has wide application prospect, can greatly improve the overall stability of the subgrade and well reduce the height of the subgrade, and has effect and applicability obviously superior to those of the prior art.
Drawings
Fig. 1 (see the seventh, attached drawing in the description) is a cross-sectional view of a roadbed.
Fig. 2 (see the seventh section and the attached drawing in the specification) is a plan layout view of a composite geomembrane partition layer.
Fig. 3 (see the seventh, attached drawings in this section) is a cross-sectional view of a plastic drain board.
FIG. 4 (see the seventh section, attached figure of the specification) is a cross-sectional view of two cloth and one film.
In the figure: 1-plastic drainage plate, 2-toe line, 3-left and right road shoulders, 4-center line, 5-composite geomembrane, 6-edge-covered geotextile, 7-surface-cleaning thickness, 8-roadbed filler, 9-SPB-B-FF-250-25 type drainage plate, 10-reverse filter layer, 11-PP50-4-250 type filament woven composite geotextile and 12-3mm thick PE high-density polyethylene hot-pressing composite geomembrane.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1, the partition layer position takes the road centerline 4 as the axial direction, and both ends extend through the road shoulder to the outside of the toe line. The structure is as follows: the plastic drainage plates are arranged at intervals of 2.5 meters along the longitudinal direction of the roadbed by 25cm (width) multiplied by 2.5cm (thickness), the length is continuously arranged by 100 meters, and the filament woven two-cloth one-film composite geotextile is laid on the drainage plates.
As shown in fig. 2, the present embodiment is a composite geomembrane salt-barrier water-blocking partition layer structure, the roadbed length is 330m, and the average filling height is 3.0 m. After the surface soil 7 is removed, the non-saline soil filler 8 is filled, the roadbed is filled to a large height, salt is prevented from rising as soon as possible, and a separation layer is arranged at a position 50cm higher than the ground.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110141530.8A CN112900177A (en) | 2021-02-02 | 2021-02-02 | Composite geomembrane salt-separating water-blocking partition layer structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110141530.8A CN112900177A (en) | 2021-02-02 | 2021-02-02 | Composite geomembrane salt-separating water-blocking partition layer structure |
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| Publication Number | Publication Date |
|---|---|
| CN112900177A true CN112900177A (en) | 2021-06-04 |
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| CN202110141530.8A Pending CN112900177A (en) | 2021-02-02 | 2021-02-02 | Composite geomembrane salt-separating water-blocking partition layer structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114250654A (en) * | 2022-01-04 | 2022-03-29 | 西南交通大学 | Ballastless track composite reinforced prestressed bed structure and construction method of high-speed railway |
| CN114411577A (en) * | 2022-02-20 | 2022-04-29 | 青海省交通建设管理有限公司 | Corrosion-resistant structure of reinforced concrete box culvert in saline soil area |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202247720U (en) * | 2011-09-09 | 2012-05-30 | 中铁二院工程集团有限责任公司 | Draining structure for cutting bed of rapid transit railway |
| CN103774515A (en) * | 2014-02-20 | 2014-05-07 | 中铁第四勘察设计院集团有限公司 | High speed railway embankment structure in salty soil regions |
| CN104088208A (en) * | 2014-07-15 | 2014-10-08 | 济南市市政工程设计研究院（集团）有限责任公司 | Wet and soft soil foundation treatment method |
| CN104250946A (en) * | 2014-10-11 | 2014-12-31 | 中铁第四勘察设计院集团有限公司 | High-speed railway subgrade structure for saline soil areas |
| CN206784082U (en) * | 2017-03-20 | 2017-12-22 | 中铁十八局集团有限公司 | A kind of High Speed Railway Subgrade of saline soil area |
| CN209243478U (en) * | 2018-08-29 | 2019-08-13 | 中交第二公路工程局有限公司 | A kind of road structure suitable for saline soil area |
-
2021
- 2021-02-02 CN CN202110141530.8A patent/CN112900177A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202247720U (en) * | 2011-09-09 | 2012-05-30 | 中铁二院工程集团有限责任公司 | Draining structure for cutting bed of rapid transit railway |
| CN103774515A (en) * | 2014-02-20 | 2014-05-07 | 中铁第四勘察设计院集团有限公司 | High speed railway embankment structure in salty soil regions |
| CN104088208A (en) * | 2014-07-15 | 2014-10-08 | 济南市市政工程设计研究院（集团）有限责任公司 | Wet and soft soil foundation treatment method |
| CN104250946A (en) * | 2014-10-11 | 2014-12-31 | 中铁第四勘察设计院集团有限公司 | High-speed railway subgrade structure for saline soil areas |
| CN206784082U (en) * | 2017-03-20 | 2017-12-22 | 中铁十八局集团有限公司 | A kind of High Speed Railway Subgrade of saline soil area |
| CN209243478U (en) * | 2018-08-29 | 2019-08-13 | 中交第二公路工程局有限公司 | A kind of road structure suitable for saline soil area |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114250654A (en) * | 2022-01-04 | 2022-03-29 | 西南交通大学 | Ballastless track composite reinforced prestressed bed structure and construction method of high-speed railway |
| CN114250654B (en) * | 2022-01-04 | 2022-07-29 | 西南交通大学 | Composite reinforced prestress foundation bed structure of ballastless track of high-speed railway and construction method |
| CN114411577A (en) * | 2022-02-20 | 2022-04-29 | 青海省交通建设管理有限公司 | Corrosion-resistant structure of reinforced concrete box culvert in saline soil area |
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