CN112942004A - Double-layer capillary barrier drainage seepage-proofing structure of embankment - Google Patents

Double-layer capillary barrier drainage seepage-proofing structure of embankment Download PDF

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CN112942004A
CN112942004A CN202110127139.2A CN202110127139A CN112942004A CN 112942004 A CN112942004 A CN 112942004A CN 202110127139 A CN202110127139 A CN 202110127139A CN 112942004 A CN112942004 A CN 112942004A
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layer
coarse
double
capillary barrier
embankment
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CN112942004B (en
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冯东
庄妍
翟钱
杜佃春
田刚
宁帅
崔晓艳
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Southeast University
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    • 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
    • E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • E03F5/0401—Gullies for use in roads or pavements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/60—Planning or developing urban green infrastructure

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Road Paving Structures (AREA)

Abstract

The invention discloses a simple, effective and easy-to-operate low-cost embankment double-layer capillary barrier drainage and seepage-proofing technology, wherein a double-layer capillary barrier drainage and seepage-proofing structure is a fine aggregate layer and a coarse aggregate layer from top to bottom. And obtaining the grain size grading data of the coarse and fine aggregates through an indoor test, and obtaining an optimal grain size grading curve by applying a statistical method, wherein the coarse and fine aggregates have the same grain size grading in different layers. The drainage anti-seepage structure takes waste building waste as raw material, changes waste into valuable, and is beneficial to the efficient utilization of resources and the sustainable development of environment. The principle of the invention is based on the difference of soil-water characteristics between coarse and fine aggregate layers, and the drainage and seepage-proofing effects of the capillary barrier structure layer in the embankment can be fully exerted. The drainage and seepage-proofing function of the capillary barrier structure layer can enable the lower soil layer to be in an unsaturated state for a long time, the initial design strength and the bearing capacity of the roadbed are kept, the occurrence of related road diseases caused by rainfall infiltration is prevented, and the long-term durability and the stability of the roadbed are further maintained.

Description

Double-layer capillary barrier drainage seepage-proofing structure of embankment
Technical Field
The invention belongs to the field of geotechnical engineering, and particularly relates to an embankment drainage anti-seepage technology based on a capillary barrier principle.
Background
In most cases, the near-surface soil above the groundwater level is in an unsaturated state. The soil body in the unsaturated state has negative pore water pressure, and compared with the saturated state, the strength and the bearing capacity are higher, and the stability is better. However, under the action of rainfall, the original unsaturated state of the soil body is changed due to rainwater infiltration, the negative pore water pressure is increased along with the increase of the water content and the saturation of the soil body, the strength and the bearing capacity of the soil body are reduced, and further instability disasters are caused.
In road engineering, the strength, bearing capacity and stability of the embankment soil body above the ground water level are mainly caused by the action of negative pore water pressure in an unsaturated state. In order to maintain the unsaturated state of the roadbed soil body and keep the roadbed soil body stable for a long time, the traditional drainage and seepage prevention method mainly comprises the steps of paving an seepage prevention interlayer, arranging a drainage plate, arranging a drainage pipeline and the like. However, the conventional drainage method has many disadvantages such as complicated process, easy failure, difficult maintenance, high cost, etc. Therefore, it is necessary to develop a simpler and more effective embankment drainage seepage prevention technology and method. By applying the double-layer capillary barrier drainage seepage-proofing technology provided by the invention, the soil layer at the lower part of the embankment can be in an unsaturated state for a long time, the initial design strength and the bearing capacity of the roadbed are kept, the occurrence of related road diseases caused by rainfall infiltration is prevented, and the long-term durability and the stability of the roadbed are further maintained.
Disclosure of Invention
The invention aims to develop a simple, effective, easy-to-operate and low-cost embankment drainage seepage-proofing technology to enable a roadbed soil body to be in an unsaturated state, so that the long-term service performance of a roadbed is maintained.
In order to achieve the purpose, the invention adopts the following technical scheme:
a double-layer capillary barrier drainage seepage-proofing structure of an embankment comprises a double-capillary barrier layer obliquely arranged in the embankment, wherein the lower end of the double-capillary barrier layer is positioned at the bottom of a side slope of the embankment; the double-capillary barrier layer comprises a fine aggregate layer and a coarse aggregate layer, and a drainage ditch is formed in the bottom of the embankment side slope.
As a further preferred option, two double-capillary barrier layers are provided within the embankment, the higher ends of the two double-capillary barrier layers being located on the centreline of the embankment cross-section.
As a further preferable scheme, the double-capillary barrier layer is a fine aggregate layer, a coarse aggregate layer, a fine aggregate layer and a coarse aggregate layer from top to bottom in sequence; the thickness of the fine aggregate layer or the coarse aggregate layer is more than 20cm, and the thickness of the double-capillary barrier layer is more than 80 cm.
As a further preferable mode, the fine bone particle size of the fine bone material layer is dThin and thin，dThin and thinHas a particle size in the range of 0.075mm<dThin and thin<2mm, the coarse bone grain diameter of the coarse bone material layer is dCoarse，dCoarseHas a particle diameter in the range of 5mm<dCoarse<20mm。
As a further preferred embodiment, the permeability coefficient at full saturation of the fine aggregate layer is ks，ksThe value satisfies ks>10-5m/s; the water inlet value of the fine aggregate layer is psiw is thinThe water inlet value of the coarse aggregate layer is psiw is coarse，ψw is thin/ψw is coarse>10, the value of the water inlet value of the coarse aggregate layer meets psiw is coarse<1kPa。
As a further preferred option, the thickness of the double capillary barrier layer increases from the upper end to the lower end.
Has the advantages that:
compared with the traditional embankment drainage seepage-proofing method, the method has the following advantages:
(1) material selection: the embankment drainage anti-seepage material selected by the invention takes the waste building rubbish as a material source, can change waste into valuable, and is beneficial to the efficient utilization of resources and the sustainable development of the environment.
(2) The process aspect is as follows: the invention abandons the traditional embankment drainage anti-seepage method with complex process, easy failure and difficult maintenance, has simple and easy-to-realize process flow for filling the embankment drainage anti-seepage structure layer, and can fill the double layers of coarse and fine aggregate layers among other embankment fillers only by transverse filling.
(3) The manufacturing cost is as follows: the invention has low cost for realizing the technical effect and is beneficial to the cost control in road engineering.
(4) In principle aspect: the capillary barrier provided by the invention has a simple and clear principle, and can effectively play a drainage and seepage-proofing effect of a capillary barrier structure layer in an embankment only based on the difference of soil-water characteristics between coarse aggregate layers and fine aggregate layers. In addition, due to the drainage and seepage-proofing effects of the capillary barrier structure layer, external rainwater can be isolated in time and drained out of the roadbed, so that the lower soil layer is kept in an unsaturated state permanently, and the initial strength, the bearing capacity and the stability of the roadbed during design are maintained.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a curve showing the relationship between the water content and permeability coefficient of coarse aggregate layer and fine aggregate layer with the change of soil matrix suction;
FIG. 3 is a relation curve of the permeability coefficient of the coarse aggregate layer and the fine aggregate layer changing with the suction force of the soil matrix.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Under the condition of natural rainfall, the road surface (particularly the road surface with cracks) and the side slope surface of the embankment are subjected to the scouring, erosion and infiltration of rainwater, so that the water content and the saturation of the soil body of the roadbed are increased. In the process of changing the soil body from the unsaturated state to the saturated state, the suction force, the strength and the bearing capacity of the matrix of the soil body are gradually reduced, and further related road diseases such as slurry turning, mud pumping, differential settlement and the like are caused, so that the stability of the roadbed is forced to be poor. However, when the capillary barrier impermeable structure layer is arranged, external rainwater immersed into the soil body of the embankment can be isolated in time and discharged out of the roadbed through the transverse channel and flows into the drainage side ditch. The drainage and seepage-proofing functions of the capillary barrier structure layer can enable the lower soil layer to be in an unsaturated state for a long time, and prevent related road diseases, so that the long-term durability and stability of the roadbed are ensured.
The invention relates to a double-layer capillary barrier embankment drainage seepage-proofing structure for a road, which comprises a double-capillary barrier layer 3 obliquely arranged in an embankment, wherein the lower end of the double-capillary barrier layer 3 is positioned at the bottom of a side slope of the embankment.
The double-capillary barrier layer 3 comprises a fine aggregate layer 1 and a coarse aggregate layer 2, and a drainage ditch 4 is formed at the bottom of the embankment side slope.
Two double-capillary barrier layers 3 are arranged in the embankment, the higher ends of the two double-capillary barrier layers 3 are positioned on the central line of the cross section of the embankment, and the thickness of the double-capillary barrier layers 3 from the higher ends to the lower ends is gradually increased.
The structure and the laying method of the drainage impervious layer are as follows: the double-capillary barrier layer 3 is composed of a fine aggregate layer 1, a coarse aggregate layer 2, a fine aggregate layer 1 and a coarse aggregate layer 2 from top to bottom in sequence; the thickness of the fine aggregate layer 1 or the coarse aggregate layer 2 is more than 20cm, the thickness of the double-capillary barrier layer 3 is more than 80cm, and other embankment filler layers are arranged on the upper portion and the lower portion of the capillary barrier structure layer. And when filling, the capillary barrier structure layer is filled in a transverse filling mode.
Determining the value range of aggregate particle size grading parameters, wherein the particle size of the fine bones of the fine aggregate layer 1 is dThin and thin，dThin and thinHas a particle size in the range of 0.075mm<dThin and thin<2mm, the coarse bone grain diameter of the coarse bone material layer 2 is dCoarse，dCoarseHas a particle diameter in the range of 5mm<dCoarse<20 mm. And obtaining the grain size grading data of the coarse and fine aggregates through an indoor test, and obtaining an optimal grain size grading curve by applying a statistical method, wherein the coarse and fine aggregates have the same grain size grading in different layers.
For the determination of the value range of the permeability coefficient and the water inflow value of the aggregate, the permeability coefficient k when the fine aggregate is completely saturated is requireds>10-5m/s to satisfyThe drainage capacity of the fine aggregate layer 1 ensures that the infiltrated rainwater can be drained out of the roadbed along the transverse channel in time and flows into the drainage side ditch when the water content of the fine aggregate layer is overhigh; the permeability coefficient of the fine aggregate layer 1 when it is completely saturated is ksWhose value satisfies ks>10-5m/s to achieve a certain drainage capacity; the water inlet value of the fine aggregate layer 1 is psiw is thinThe coarse aggregate layer 2 has a water inlet value of psiw is coarse，ψw is thin/ψw is coarse>10, the capillary barrier effect is fully exerted, and the value of the water inlet value of the coarse aggregate layer meets psiw is coarse<1kPa to ensure that the coarse aggregate layer 2 has stronger seepage-proofing capacity.
According to a specific grain size grading curve obtained by an indoor test, two kinds of coarse and fine aggregates are produced in batches according to the requirements of engineering quantity. As shown in the attached figure 1, the capillary barrier drainage impervious structure layer is filled between other embankment fillers in a segmented and clamped mode in a transverse filling mode at an embankment filling site, and the layers are compacted.
The reasonable selection of paving material, the thick, fine aggregate that constitutes this double-deck capillary barrier layer 3 all derives from dumped building rubbish including abandonment masonry, rubble, concrete etc. that produce when the house is removed, or abandonment pitch, rubble etc. that produce when original road surface is demolishd and is rebuild.
The capillary barrier effect is the core principle for implementing the anti-seepage technology. Due to the difference of soil-water characteristics among soil body materials with different grain size grading, the migration rule of water flow in the soil body materials is different. Therefore, a capillary barrier effect exists at the interface between soil materials with different grading, and further infiltration of water flow is prevented. The invention provides a drainage anti-seepage technology based on the capillary barrier principle, and solves the long-term waterproof problem of an embankment.
Fig. 1 is a schematic cross-sectional view of an embankment provided with a double capillary barrier drainage and permeation prevention layer. In order to further enhance the drainage and seepage-proofing effect of the embankment, the capillary barrier drainage and seepage-proofing structure layer is arranged in the embankment in a splayed shape. In order to enhance the visibility of the diagram, the size of the capillary barrier drainage impervious structure layer is enlarged in the cross-sectional diagram of the embankment and is partially enlarged. Normally, the thick aggregate layer and the thin aggregate layer are superposed to form a capillary barrier structure, and the fine aggregate layer 1 is positioned on the upper part of the thick aggregate layer 2. However, in order to fully exert the water-resisting and water-draining functions of the capillary barrier, the double-capillary barrier structure layer is adopted in the invention, so that the water-draining and water-preventing effect of the embankment is ensured as much as possible.
FIG. 2 is a curve of the relationship between the volume water content and the permeability coefficient of the coarse and fine aggregate layers 1 with the suction of the soil matrix, which is obtained by a statistical method. As can be seen from the attached figure 2, the relationship curve of the volume water content of the coarse aggregate layer 1 and the fine aggregate layer 1 along with the change of the soil matrix suction is different. Due to the fact that the soil-water characteristic curves of the two aggregate layers have large difference, under the unsaturated state, the capillary barrier effect at the interface of the coarse aggregate layer 1 and the fine aggregate layer 1 is exerted. Research finds that many factors influence the soil-water characteristic curve of the soil body, such as particle shape, aperture size, material type, particle size grading and the like, wherein the most important factor is the particle size grading of the soil body. By controlling the grain size grading, the difference of soil-water characteristic curves between coarse and fine aggregates can be maximized, and the capillary barrier effect can be effectively exerted.
FIG. 3 is a relation curve of the permeability coefficient of the coarse aggregate layer 1 and the fine aggregate layer 1 along with the change of the soil matrix suction. The permeability coefficient (k) of the coarse and fine aggregates in a fully saturated state is measured by an indoor tests) After sizing, FIG. 3 is derived statistically from FIG. 2. FIG. 3 also shows the difference in permeability coefficient of coarse and fine aggregates with different particle size grading as a function of the substrate suction. As can be seen from fig. 3, in most cases, the permeability coefficient of fine aggregate is greater than that of coarse aggregate when the aggregate is in an unsaturated state (e.g., when the matrix suction is greater than a certain value). Such a difference in permeability coefficient causes water to preferentially drain from the fine aggregate layer 1 through the lateral channels out of the subgrade and into the drainage gutter as it passes through the capillary barrier structure layer.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (6)

1. The utility model provides a double-deck capillary barrier drainage seepage prevention structure of embankment which characterized in that: the double-capillary barrier layer structure comprises a double-capillary barrier layer (3) obliquely arranged in an embankment, wherein the lower end of the double-capillary barrier layer (3) is positioned at the bottom of a side slope of the embankment; the double-capillary barrier layer (3) comprises a fine aggregate layer (1) and a coarse aggregate layer (2), and a drainage ditch (4) is formed in the bottom of the embankment side slope.
2. The double-layer capillary barrier drainage seepage-proofing structure of the embankment according to claim 1, wherein: the embankment is internally provided with two double-capillary barrier layers (3), and the higher ends of the two double-capillary barrier layers (3) are positioned on the central line of the cross section of the embankment.
3. The double-layer capillary barrier drainage seepage-proofing structure of the embankment according to claim 1, wherein: the double-capillary barrier layer (3) is sequentially provided with a fine aggregate layer (1), a coarse aggregate layer (2), a fine aggregate layer (1) and a coarse aggregate layer (2) from top to bottom; the thickness of the fine aggregate layer (1) or the coarse aggregate layer (2) is more than 20cm, and the thickness of the double-capillary barrier layer (3) is more than 80 cm.
4. The double-layer capillary barrier drainage seepage-proofing structure of the embankment according to claim 1, wherein: the particle diameter of the fine bone material layer (1) is dThin and thin，dThin and thinHas a particle size in the range of 0.075mm<dThin and thin<2mm, the coarse bone grain diameter of the coarse bone material layer (2) is dCoarse，dCoarseHas a particle diameter in the range of 5mm<dCoarse<20mm。
5. The double-layer capillary barrier drainage seepage-proofing structure of the embankment according to claim 1, wherein: the permeability coefficient of the fine aggregate layer (1) is k when the fine aggregate layer is completely saturateds，ksThe value satisfies ks>10-5m/s; the water inlet value of the fine aggregate layer (1) is psiw is thinThe water inlet value of the coarse aggregate layer (2) is psiw is coarse，ψw is thin/ψw is coarse>10, the value of the water inlet value of the coarse aggregate layer meets psiw is coarse<1kPa。
6. The double-layer capillary barrier drainage seepage-proofing structure of the embankment according to claim 1, wherein: the thickness of the double capillary barrier layer (3) increases gradually from the higher end to the lower end.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115341427A (en) * 2022-09-06 2022-11-15 东南大学 Highway seepage-proofing drainage structure based on capillary isolation principle and construction method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103510441A (en) * 2013-10-16 2014-01-15 江苏省镇江市路桥工程总公司 Three-dimensional-drainage roadbed structure for preventing water damage of road in cold region and construction method thereof
CN111206598A (en) * 2020-01-07 2020-05-29 浙江大学 Method for cooperatively utilizing construction waste in hillock landscaping project

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103510441A (en) * 2013-10-16 2014-01-15 江苏省镇江市路桥工程总公司 Three-dimensional-drainage roadbed structure for preventing water damage of road in cold region and construction method thereof
CN111206598A (en) * 2020-01-07 2020-05-29 浙江大学 Method for cooperatively utilizing construction waste in hillock landscaping project

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115341427A (en) * 2022-09-06 2022-11-15 东南大学 Highway seepage-proofing drainage structure based on capillary isolation principle and construction method thereof
CN115341427B (en) * 2022-09-06 2024-05-28 东南大学 Highway seepage-proofing drainage structure based on capillary isolation principle and construction method thereof

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