WO2011079468A1 - 一种冻土区公路路基保护方法及路面结构 - Google Patents
一种冻土区公路路基保护方法及路面结构 Download PDFInfo
- Publication number
- WO2011079468A1 WO2011079468A1 PCT/CN2009/076362 CN2009076362W WO2011079468A1 WO 2011079468 A1 WO2011079468 A1 WO 2011079468A1 CN 2009076362 W CN2009076362 W CN 2009076362W WO 2011079468 A1 WO2011079468 A1 WO 2011079468A1
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- WO
- WIPO (PCT)
- Prior art keywords
- thermal conductivity
- micro
- layer
- nano powder
- pavement
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- 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
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
- E01C11/245—Methods or arrangements for preventing slipperiness or protecting against influences of the weather for preventing ice formation or for loosening ice, e.g. special additives to the paving material, resilient coatings
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00405—Materials with a gradually increasing or decreasing concentration of ingredients or property from one layer to another
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
Definitions
- the invention relates to the technical field of highway subgrade protection in a permafrost region, in particular to a roadbed protection method and a pavement structure in a permafrost region. Background of the invention
- Frozen soil is a kind of soil medium that is extremely sensitive to temperature. It is rich in underground ice and has a metamorphosis '1'.
- the Qinghai-Tibet Highway is the first road in the world to lay asphalt roads in the permafrost region.
- the "black cover" of the asphalt pavement causes the road surface to absorb a large amount of solar radiation and impede the evaporation of water during the warm season.
- a large amount of heat accumulates in the cold season subgrade can not be discharged, and the frozen soil is extremely sensitive to temperature, and the repeated freezing and thawing process leads to the road.
- the roadbed is unstable, making road sickness frequent.
- Raising the roadbed and ventilation duct technology is one of the most common engineering measures in the frozen soil protection project.
- the Qinghai-Tibet Highway Research Group carried out the third phase of renovation of the asphalt pavement in permafrost regions from 1985 to 1999.
- the subgrade height was generally raised by about 3 m, but the roadbed disease caused by the difference between the temperature fields of the Yinyang surface was also followed. It shows that the shoulders on the left side (positive side) have collapsed shoulders and longitudinal cracks.
- the high roadbed also brings thickening of the melted interlayer under the roadbed, and the settlement of the roadbed is increased, which brings great hidden danger to the instability of the roadbed.
- Predetermined ventilation pipes in roadbeds and embankments have also achieved certain effects.
- the laying of the ventilation pipe is based on forced convection heat transfer. It is effective to be higher than a certain distance from the natural surface, thus increasing the slope area of the embankment, which is easy to cause the yin and sun slope effect of the subgrade. From the use situation, the effect is not satisfactory.
- various improved ventilation pipes proposed in the domestic plateau frozen soil roadbed have similar effects.
- Block (broken) stone roadbed technology is also a protective measure for cooling the foundation. It uses the gap between the gravel to achieve the effect of ventilation and cooling.
- Research by Lai Yuanming et al. (Study on the temperature characteristics of the riprap roadbed of the Qinghai-Tibet Railway. Glacier Frozen Soil, 2003, 03) riprap road subgrade cooling technology and the upper and lower interface of the riprap layer The temperature difference and the riprap particle size have a certain correlation. When the critical condition is difficult to meet, the cooling effect of the riprap layer is difficult to play. At the same time, because the gravel layer is wider (usually 20 meters), the ventilation effect of the middle part is more Poor or even no, reducing the effect of the gravel layer.
- the hot rod technology has a thermal leak problem that can no longer be used once it is leaked, and its performance depends on the climatic conditions, the bulk density of the surrounding soil, and the water content.
- the sun visor technology has significant cooling, it is an engineering measure that can effectively reduce the temperature of permafrost under the roadbed.
- this engineering measure is costly and easy to damage in harsh environments such as the Qinghai-Tibet Plateau, and the maintenance cost is large. Vegetation, and the sun visor is white reflective Harmful to driving safety.
- the embodiment of the invention provides a roadbed protection method for a frozen soil area, which can effectively protect the roadbed of the highway in the frozen soil area, and is easy to construct and low in cost.
- the embodiment of the invention provides a road surface structure, which can effectively protect the roadbed of the highway in the permafrost region, and is easy to construct and low in cost.
- a roadbed protection method for a frozen soil area comprising: the thermal conductivity of the pavement layer is decreasing from top to bottom.
- a pavement structure comprising:
- Two or more layers of pavement having a gradient thermal conductivity structure Two or more layers of pavement having a gradient thermal conductivity structure
- the thermal conductivity of the pavement layer is a decreasing distribution from top to bottom in units of layers.
- the highway roadbed protection method and the road surface structure of the permafrost region of the present invention form a gradient thermal conductivity pavement structure having a unidirectional heat conduction function.
- the thermal conductivity of the middle layer is smaller than that of the upper layer, the thermal resistance becomes larger, and part of the heat is retransmitted back to the upper layer, returning to the air.
- the lower layer thermal resistance is larger, part of the heat is transferred back to the middle layer, then returned to the upper layer by the middle layer, and finally returned to the air, only a small part of the heat passes.
- the lower layer is transported to the subgrade, thereby preventing heat from the road surface from being transmitted to the permafrost of the subgrade and the subgrade.
- the heat accumulated in the permafrost under the subgrade and subgrade reaches the upper layer through the lower and middle layers, due to the large thermal conductivity gradient between the layers, the interlayer
- the large temperature difference causes the heat accumulated in the frozen soil to be easily released into the air, thereby maintaining the low temperature of the frozen soil.
- the frozen soil In a cold and warm cycle, the frozen soil generally shows an exothermic state, which is not easy to produce the melting of frozen soil caused by heat accumulation, so as to protect the frozen soil and the roadbed.
- the invention can adopt the conventional road surface construction method, is easy to combine the conventional road surface construction, maintenance and regeneration technology, and has the advantages of easy construction and low cost.
- FIG. 1 is a schematic view showing the structure of a road pavement of the present invention. Mode for carrying out the invention
- the invention mainly utilizes the principle of heat conduction to form a gradient thermal conductivity structure from top to bottom from top to bottom, thereby forming a unidirectional heat conduction channel from the roadbed to the air, so that heat is easily dissipated from the roadbed to the roadbed.
- the heat in the air is prevented from being transmitted to the roadbed, and the cooling effect on the frozen soil layer under the roadbed is realized, thereby increasing the upper limit of the frozen soil, reducing the thickness of the melted interlayer, maintaining the stability of the frozen soil and the roadbed, and improving the operation of the highway in the frozen soil area.
- the present invention employs two or two layers.
- different pavement layers have different thermal conductivities, thereby realizing a pavement structure with gradient thermal conductivity distributed in layers.
- a three-layer pavement structure can be used.
- the pavement layer is divided into upper, middle and lower layers.
- the upper layer has the highest thermal conductivity
- the lower layer has the lowest thermal conductivity
- the middle layer has the lowest thermal conductivity.
- the upper layer with high thermal conductivity can be realized by adding micro-nano powder with high thermal conductivity in the upper layer
- the lower layer with low thermal conductivity can be realized by adding micro-nano powder with low thermal conductivity in the lower layer, and the middle layer of median thermal conductivity.
- micro-nano powder having a median thermal conductivity in the middle layer it is possible to add a micro-nano powder having a median thermal conductivity in the middle layer, or to add a low thermal conductivity micro-nano powder having a smaller amount than the lower layer in the middle layer (for example, the amount of the micro-nano powder having a low thermal conductivity added in the middle layer is the lower layer
- the amount of addition is 1/2 to 1/10), or it is achieved without adding micro/nano powder.
- the road pavement layer is laid on the roadbed 7, and from top to bottom is the upper layer 4, the middle layer 5, and the lower layer 6, wherein the upper layer 4 is distributed with the micro-nano powder 1 having high thermal conductivity, and the middle layer 5 is distributed with the median thermal conductivity.
- the micro-nano powder 2 has a low thermal conductivity micro-nano powder 3 distributed in the lower layer 6.
- the high thermal conductivity micro-nano powder 1 makes the upper layer 1 exhibit a high thermal conductivity as a whole, and the low thermal conductivity micro-nano powder 3 makes the lower layer 6 exhibit a low thermal conductivity as a whole, while the middle layer 5 has a low thermal conductivity.
- the overall thermal conductivity is between the upper layer 4 and the lower layer 6, so that the road surface forms a gradient thermal conductivity structure from high to low from top to bottom.
- the micro-nano powder 1 having high thermal conductivity may be graphite or silicon carbide.
- the micro-nano powder 2 of the median thermal conductivity may be silicon oxide, aluminum oxide, zinc oxide or the like.
- the low thermal conductivity micro-nano powder 3 can be mica powder, wood fiber, fly ash, floating beads, sinker beads, glass wool, slag, polyurethane foam, polystyrene foam, polyvinyl chloride foam, and the like.
- the micro/nano powder may be mixed in a single component or in any ratio of different components.
- the material of thermal conductivity characteristics is realized, and the examples of the present invention, such as graphite and silicon carbide, are commonly used industrial raw materials, while fly ash, floating beads, sinker beads, glass wool, slag, etc. are common industrial wastes, wood fibers.
- Polyurethane foam, polystyrene foam, polyvinyl chloride foam, etc. are organic fibers. These materials are used as additives, which are low in cost and easy to obtain. Conducive to environmental protection and recycling of resources.
- the addition amount of micro-nano powders with different thermal conductivity can be determined according to the heat conduction effect and cost, for example, adding 1% to 10% of high thermal conductivity micro-nano powder 1 in the upper pavement, powder
- the particle size may range from 0.5 microns to 500 microns. Adding 1% ⁇ 10% of the median thermal conductivity of the micro-nano powder 2 to the middle pavement, the powder particle size can be 0.5 micron to 500 micron; adding 5% ⁇ 40% low thermal conductivity micro-nano powder to the lower pavement 3, the powder particle size can be 0.25 microns ⁇ 40 (H meters.
- a micro-nano powder 1 having a high thermal conductivity of 1% to 10% is added to the upper pavement, and the powder may have a particle diameter of 0.5 ⁇ m to 500 ⁇ m.
- the micro-nano powder is not added to the middle pavement; the micro-nano powder 3 with a low thermal conductivity of 5% to 40% is added to the lower surface, and the powder may have a particle diameter of 0.25 ⁇ m to 400 ⁇ m.
- a micro-nano powder 1 having a high thermal conductivity of 1% to 10% may be added to the upper pavement, and the powder may have a particle diameter of 0.5 ⁇ m to 500 ⁇ m.
- the powder particle size may be 0.25 micrometers to 400 micrometers; 5% ⁇ 40% low thermal conductivity micro-nano powder 3 is added to the lower pavement.
- the powder particle size may range from 0.25 microns to 400 microns.
- the powder may be added by replacing the ore powder in the pavement layer matrix mixture with the micro-nano powder.
- the particle size range of the powder particles can also be wider, and the present invention uses micro-nano powders of 0.25 micrometers to 400 micrometers or 0.5 micrometers to 500 micrometers, and has good tensile strength, toughness, ductility and durability. At the same time, it has a large specific surface area. In addition to the desired thermal conductivity, it can also make the powder-based pavement matrix mixture have higher strength and higher mechanical properties, and can effectively improve the road performance of the road surface. At the same time, the cost of the pavement is very low due to the small amount of powder to be added.
- the subgrade 7 may be first compacted, and then the lower layer 6 modified by the low thermal conductivity powder 3 is laid on the subgrade 7; after compaction, the median thermal conductivity is laid on the lower layer 6 Powder 2 or low thermal conductivity powder 3 modified intermediate layer 5, or intermediate layer 5 without micro-nano powder; after compaction, the upper layer 4 modified with high thermal conductivity powder 1 is laid on the middle layer 5, Finally, a pavement layer structure having a gradient thermal conductivity is formed.
- the thermal resistance of the middle layer 5 is relatively large, and therefore, part of the heat to be transferred to the middle layer 5 is transmitted back.
- Upper layer 4 and return to the air.
- some of the heat that passes through the middle layer 5 and is about to enter the lower layer 6 will be transported into the air through the middle layer 5 and the upper layer 4.
- Only a small fraction of the solar radiant heat can be transferred to the subgrade 7. Therefore, the pavement structure has an "insulation" function, which can effectively prevent solar radiation heat from being transmitted to the roadbed and permafrost.
- the pavement structure In the cold season, since the pavement layer has a thermal conductivity gradient of "lower and larger", the heat accumulated under the subgrade reaches the middle layer 5 through the lower layer 6, because the interlayer thermal conductivity gradient of the lower and middle layers is large, that is, the layer The temperature difference between the two is large, which causes the heat to be easily transferred into the middle layer 5; similarly, the heat will also easily enter the upper layer 4 and be released into the cold air. Therefore, the pavement structure also has an "endothermic" function, which can fully dissipate the heat accumulated under the roadbed and the roadbed into the road surface air.
- the road protection method and the road surface structure of the permafrost region of the present invention form a gradient thermal conductivity structure with a unidirectional heat conduction function, so that the road and the roadbed are not easily melted by the frozen soil. Deformation and rupture, achieving good road protection.
- the pavement additive used in the present invention has a low cost, is small in addition, is easy to obtain, and is low in cost and convenient in construction.
- the maintenance after road construction is greatly reduced, and the maintenance cost is greatly reduced.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2009/076362 WO2011079468A1 (zh) | 2009-12-31 | 2009-12-31 | 一种冻土区公路路基保护方法及路面结构 |
US12/989,782 US8303211B2 (en) | 2009-12-31 | 2009-12-31 | Method and pavement structure for protecting highway subgrade in frozen soil area |
CN200980101079.4A CN102084064B (zh) | 2009-12-31 | 2009-12-31 | 一种冻土区公路路基保护方法及路面结构 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2009/076362 WO2011079468A1 (zh) | 2009-12-31 | 2009-12-31 | 一种冻土区公路路基保护方法及路面结构 |
Publications (1)
Publication Number | Publication Date |
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WO2011079468A1 true WO2011079468A1 (zh) | 2011-07-07 |
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Family Applications (1)
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PCT/CN2009/076362 WO2011079468A1 (zh) | 2009-12-31 | 2009-12-31 | 一种冻土区公路路基保护方法及路面结构 |
Country Status (3)
Country | Link |
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US (1) | US8303211B2 (zh) |
CN (1) | CN102084064B (zh) |
WO (1) | WO2011079468A1 (zh) |
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- 2009-12-31 CN CN200980101079.4A patent/CN102084064B/zh not_active Expired - Fee Related
- 2009-12-31 US US12/989,782 patent/US8303211B2/en active Active
- 2009-12-31 WO PCT/CN2009/076362 patent/WO2011079468A1/zh active Application Filing
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CN85105302A (zh) * | 1985-07-10 | 1987-01-14 | 伊·詹姆斯·米勒 | 改进的沥青路面 |
SU1594240A1 (ru) * | 1987-05-18 | 1990-09-23 | Сибирский автомобильно-дорожный институт им.В.В.Куйбышева | Дорожна конструкци |
CA2051024A1 (en) * | 1991-09-10 | 1993-03-11 | Laurel E. Goodrich | Variable conductivity trafficked surface for permafrost regions |
CN1478962A (zh) * | 2003-04-30 | 2004-03-03 | 中国科学院寒区旱区环境与工程研究所 | 导热系数可变装置及其应用 |
CN1570294A (zh) * | 2004-04-23 | 2005-01-26 | 中国科学院寒区旱区环境与工程研究所 | 单向导热装置 |
JP2007023653A (ja) * | 2005-07-19 | 2007-02-01 | Dow Kakoh Kk | 凍上防止構造 |
CN1793526A (zh) * | 2005-12-20 | 2006-06-28 | 中国科学院寒区旱区环境与工程研究所 | 一种降低路基冻土地温场的高效单向导热装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107201702A (zh) * | 2016-03-17 | 2017-09-26 | 中国科学院寒区旱区环境与工程研究所 | 对流调控全壁通风透气式冻土通风路堤 |
CN112745685A (zh) * | 2019-10-30 | 2021-05-04 | 中国石油化工股份有限公司 | 一种冻土路面用明色胶结料及其制法 |
Also Published As
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CN102084064B (zh) | 2012-09-05 |
US20110243659A1 (en) | 2011-10-06 |
CN102084064A (zh) | 2011-06-01 |
US8303211B2 (en) | 2012-11-06 |
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