CN107201708A - A kind of compound cold-storage roadbed suitable for permafrost region road engineering - Google Patents
A kind of compound cold-storage roadbed suitable for permafrost region road engineering Download PDFInfo
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- CN107201708A CN107201708A CN201610152068.0A CN201610152068A CN107201708A CN 107201708 A CN107201708 A CN 107201708A CN 201610152068 A CN201610152068 A CN 201610152068A CN 107201708 A CN107201708 A CN 107201708A
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- ventilation duct
- pipe
- roadbed
- filled soil
- embankment filled
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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
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Abstract
The present invention relates to a kind of compound cold-storage roadbed suitable for permafrost region road engineering, including top embankment filled soil, bottom embankment filled soil and it is laid between the top embankment filled soil and the bottom embankment filled soil and perpendicular to the ventilation duct of trend of road, it is characterised in that：The one or both ends of the ventilation duct are installed by air door；Hollow block layer is laid between the adjacent ventilation duct, and pipe-massive stone layer is equipped with the ventilation duct and the hollow block；The pipe-massive stone layer is provided with geotextiles, the geotextiles and lays the top embankment filled soil.The present invention can effectively reach High-Grade Highway Subgrade entirety, the key technical index of uniform decrease in temperature, so as to be obviously improved the cooling efficiency of roadbed, improve subgrade stability, have significant advantage for reducing the possible heaving of the sea in road surface and fracture development.
Description
Technical field
The present invention relates to frozen soil engineering technical field, more particularly to a kind of compound cold-storage suitable for permafrost region road engineering
Roadbed.
Background technology
Frozen soil is the Rock And Soil containing ice that temperature is not higher than 0 DEG C, can be divided into instantaneous frozen soil, season by the length of freezing period
Save frozen soil and ever-frozen ground.With the development of economic society, the engineering construction of Permafrost Area gradually increases, especially road
Engineering.The construction of road engineering will significantly change the Warm status for the ever-frozen ground that underlies, and cause frozen soils temperature rise, bearing capacity drop
It is low, and then the sedimentation of roadbed may be caused.Therefore, Frozen soil problems have become the success of Permafrost Area road project with
No key issue.
In the research of Qinghai-Tibet Railway, in order to ensure the long-time stability of roadbed, researcher proposes active cooling road
The thinking of base, and carried out by core of the thinking substantial amounts of active cooling road structure research, and find part road structure
There is good application effect for improving subgrade stability.However, in high temperature hight-ice-content permafrost area, roadbed knot is had at present
There is the problem of cooling efficiency is not enough in structure.Meanwhile, the bituminous paving heat absorption intensity of highway is significantly higher than railway road surface, and correlation is ground
Study carefully and show, in Permafrost Area, the strong heat-absorbing action of bituminous paving can cause the steady decay of bottom ever-frozen ground, Yi Jiduo
Year frozen soil upper limit declines, hight-ice-content permafrost melts etc., and then a series of engineering such as causes the sedimentation of highway subgrade, collapses ask
Topic, the problem will be protruded more under conditions of Future Climate persistently warms.
At present, the construction of Qinghai-Tibet highway has been brought into schedule, because the width of roadway of highway is public compared to Qinghai-Tibet
Road, which has, to be significantly increased, and roadbed heat absorption intensity will also be multiplied.It is high in order to ensure the stability after the highway build of Qinghai-Tibet
Warm hight-ice-content permafrost area section must use rational active cooling regulation measure.However, because embankment breadth significantly increases
Greatly, the application effect for having regulation measure at present is caused to will further decrease.Therefore, researcher attempts to arrange existing regulation and control
Apply and be combined, to improve the controlling performance of engineering measure, but be due to the deficiency of design structure, it is difficult to meet engineering actual
Need.Such as：《A kind of perforated ventilation pipe-cooling and insulating composite road bed the application in broad width road of block rubble》（Lai Yuanming, Dong Yuan
It is grand, Zhang Mingyi：China, 201010133544.7 [P] 2010.09.01）A kind of perforated ventilation pipe-block rubble is proposed to be combined
Roadbed, perforated ventilation pipe is placed on pipe-massive stone layer, and it is not enough in the cooling efficiency of cold season；And in warm season, this kind of structure
The incoming block stone layer of amount of heat is reduced the cold accumulation effects of block stone layer by transmural hole.《Composite temperature controlled ventilation roadbed》（Yu Qihao,
Cheng Guodong, Niu Fujun etc.：China, 200410002135.8 [P] 2004.12.22）Propose a kind of automatic temperature-controlled ventilation duct-
The composite road bed structure of warming plate, but ventilation duct temperature-fall period has significant inhomogeneities in the structure, to control roadbed not
Uniform settlement is unfavorable.《Reinforced ventilating heat-proof foundation》（Li Guoyu, Li Ning, Niu Fujun etc.：China, 200710017288
[P]. 2007.08.08）A kind of reinforced ventilating heat-proof foundation of automatic control perforated ventilation pipe-block rubble-insulation material is proposed, but
Bed course in the structure under ventilation duct is relatively thin, and the ventilation mouth of pipe is easily crammed in cold season by snow and dust storm etc., causes cold season cooling significantly
Reduction；In addition, fragment rock layers can play good heat-blocking action in warm season, the insulation material that its top is placed is for enhancing roadbed
Effect of heat insulation meaning it is smaller, but significantly reduce the cooling-down effect of roadbed cold season；In addition, although perforated ventilation pipe exists
Tested in the engineering of part, but do not there is document to show that the measure has significant advantage compared to common ventilation pipe, and this is arranged
Greatly improving for construction costs can but be caused by applying.
In addition, there is also problem for application of the heat pipe measure commonly used at present in frozen soil engineering in road engineering.Due to
The temperature-fall period of the measure has significant inhomogeneities, and existing application experience shows that the measure has been drawn in the application of road engineering
The development of roadbed cracks is played, such as Fig. 1 ~ 2 are the developmental state that typical heat pipe acts on lower crack（The crack of heat pipe roadbed development
（Yu Qihao, Fan Kai, Qian Jin, Guo Lei, You Yanhui, China's Permafrost Area highway build key issue research, Chinese section
Learn:Technological sciences, 2014,44（4）: 425 ~ 432））.Based on highway for roadbed settling amount and crack it is tight
Lattice requirement, such highway has special requirement for the entirety of roadbed, uniform decrease in temperature.Therefore, existing method there is no at present
Method meets the construction requirements of permafrost region highway, it is necessary to seek highly efficient, rational frozen earth roadbed safeguard measure.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of effective reduction frozen soil ground temperature, improve the suitable of frozen earth stable
Compound cold-storage roadbed for permafrost region road engineering.
To solve the above problems, a kind of compound cold-storage roadbed suitable for permafrost region road engineering of the present invention, bag
Include top embankment filled soil, bottom embankment filled soil and be laid between the top embankment filled soil and the bottom embankment filled soil and hang down
Directly in the ventilation duct of trend of road, it is characterised in that：The one or both ends of the ventilation duct are installed by air door；The adjacent ventilation duct
Between laying hollow block layer, and be equipped with pipe-massive stone layer on the ventilation duct and the hollow block；The pipe-massive stone layer is provided with soil
The top embankment filled soil is laid in work cloth, the geotextiles.
The caliber of the ventilation duct is 30 ~ 60cm, and pipe thickness is 3 ~ 6cm, and tube center distance is from natural earth's surface apparent height
For 0.5 ~ 2.0m.
The spacing of the adjacent ventilation duct is 1 ~ 3 times of the ventilation duct caliber.
The thickness of the hollow block layer is consistent with the ventilation pipe diameter, and hollow block is by 6 ~ 30cm of the length of side, 2 ~ 6cm of wall thickness
Concrete prefabricated hollow cube or cuboid constitute.
The particle diameter of the pipe-massive stone layer is that 10 ~ 40cm, laying depth are 1 ~ 2m.
The present invention has advantages below compared with prior art：
1st, Innovation project measure regulatory mechanism.
Be first in embankment aspect linkage, cooling mechanism.In cold season temperature-fall period, between ventilation duct pipe in hollow block layer
Macroporosity cause ventilation duct between heat convection effect significantly strengthen, be effectively formed ventilation duct --- hollow block aspect linkage,
Cooling mechanism, is to realize roadbed entirety, the basic mechanism of uniform decrease in temperature；Next to that homeostasis mechanism.In warm season, due to roadbed
The difference of Schattenseite, tailo solar radiation and domatic temperature, can cause in embankment cross section, and roadbed arranged on left and right sides ground temperature is certain
Otherness, due to the presence of block stone layer and the big space condition of hollow block, block stone, hollow block layer that can be in embankment cross section
It is interior, certain Convective Heat Transfer is produced between embankment left and right side different parts, the ground temperature difference of embankment, production is thus balanced
The ground temperature homeostasis mechanism of means of livelihood base；Finally, the present invention is the cold-storage mechanism of roadbed.In temperature-rise period, due to temperature certainly
Innervation should, the timely closing of control air door, the stopping of vertical Convective Heat Transfer, leads in ventilation duct, in hollow block and block stone layer
Hot property is greatly reduced, and the cold energy of winter aggregation, thus circulates and effectively reach constantly reduction frozen soil temperature effectively inside storage roadbed
The purpose of degree.
2nd, High-Grade Highway Subgrade entirety, the key technology difficulty of uniform earth temperature controlling are effectively solved.
Firstly, since above-mentioned aspect linkage, the formation of cooling mechanism, thereby result in the overall aspect of embankment of temperature-fall period
Synchronous, uniform decrease in temperature, and form smooth, the symmetrical favourable form of 0 DEG C of ground temperature isopleth, overall Temperature Field.Secondly, above-mentioned
Under homeostasis mechanism, effectively alleviate warm season roadbed ground temperature otherness, be further ensured that ground temperature field uniformity.Thus, two are passed through
The synthesis of person, effectively solves high-grade highway entirety, the problems of uniform ground temperature regulation and control.
3rd, it is obviously improved the cooling efficiency of roadbed.
It is whole roadbed is effectively ensured just because of above-mentioned cooling of the invention, balance, the presence of the triple mechanism of cold-storage, superposition
While body, uniform decrease in temperature, cooling efficiency is also caused to greatly improve.
4th, it is effectively increased subgrade stability.
Although existing measure largely effectively reduces the ground temperature of roadbed, as the change and roadbed in season are certain
The frozen-thaw process occurred in depth bounds, inevitably causes occur roadbed frost damage, thaw collapse to a certain extent, and to roadbed
Stability affects.Because block stone layer belongs to flexible, self stress equilibrium basis, the block stone layer that the present invention is laid can
Largely to alleviate adverse effect caused by unfreezing.Therefore, block stone layer of the invention has temperature adjustment, modulation shape dual
Effect.Thus, the probability of happening of the potential secondary subgrade engineering disease of roadbed is greatly reduced, the stability of roadbed is improved.
Brief description of the drawings
The embodiment to the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is the developmental state a that typical heat pipe acts on lower crack.
Fig. 2 is the developmental state b that typical heat pipe acts on lower crack.
Fig. 3 is cross-sectional view of the invention.
Fig. 4 is skiagraph of the invention.
Fig. 5 is the contrast using rear venting pipe position roadbed cross section frozen soil upper limit of the present invention and other two kinds of measures.
Fig. 6 is the contrast using roadbed center vertical section frozen soil upper limit and other two kinds of measures after the present invention.
In figure：1-ventilation duct, 2-air door, 3-pipe-massive stone layer, 4-hollow block, 5-geotextiles of layer, 6-top
7-bottom of embankment filled soil embankment filled soil 8-natural earth's surface.
Embodiment
As shown in Figure 3, Figure 4, a kind of compound cold-storage roadbed suitable for permafrost region road engineering, including top embankment filled soil
6th, bottom embankment filled soil 7 and it is laid between top embankment filled soil 6 and bottom embankment filled soil 7 and perpendicular to the ventilation of trend of road
Pipe 1.The one or both ends of ventilation duct 1 are installed by air door 2；Hollow block layer 4, and the ventilation duct 1 and sky are laid between adjacent ventilation duct 1
Pipe-massive stone layer 3 is equipped with heart block layer 4；Pipe-massive stone layer 3, which is provided with geotextiles 5, the geotextiles 5, lays top embankment filled soil 6.
Wherein：The caliber of ventilation duct 1 is 30 ~ 60cm, and pipe thickness is 3 ~ 6cm, and tube center distance is high from the natural surface of earth's surface 8
Spend for 0.5 ~ 2.0m.
The spacing of adjacent ventilation duct 1 is 1 ~ 3 times of the caliber of ventilation duct 1.
The thickness of hollow block layer 4 is consistent with the diameter of ventilation duct 1, and hollow block is by 6 ~ 30cm of the length of side, 2 ~ 6cm of wall thickness coagulation
The cube or cuboid of native precast hollow are constituted.
The particle diameter of pipe-massive stone layer 3 is that 10 ~ 40cm, laying depth are 1 ~ 2m.
Working mechanism of the present invention：
In cold season, the automatic control air door 2 of ventilation duct 1 is automatically opened up, and cool ambient air enters ventilation duct 1, quick reduction surrounding embankment soil
Heat largely discharges in temperature, roadbed；Simultaneously as tube wall temperature is very low, and surrounding hollow block 4 internal pore of layer are larger,
Thus formed in hollow block layer 4 under strong heat convection effect, the cooling extent of the soil body between increase pipe improves roadbed cooling
The globality of process.In warm season, the automatic control air door 2 of ventilation duct 1 is closed, prevents external heat from entering in pipe, significantly reduce road automatically
The caloric receptivity of base；Simultaneously as heat convection effect is not present in the low characteristic of relative superiority or inferiority in temperature, pipe-massive stone layer 3 and hollow block,
The heat-conductive characteristic of its own is poor, thus plays a part of in warm season preventing heat from transmitting to roadbed, the top of pipe-massive stone layer 3 soil
The application of work cloth 5 can ensure that a layer internal pore is not significantly reduced in longer period, it is ensured that this one-way heat conduction of roadbed
The long-term effectiveness of performance.
Concrete application example 1 of the present invention：
(1) the natural earth's surface 8 in compacting is filled bottom embankment filled soil 7 and tamped, and bankets and is higher by 0.5 ~ 2.0m of former natural earth's surface.
(2) the prefabricated ventilation with automatic control air door 2 perpendicular to trend of road is laid on the bottom embankment filled soil 7 of compacting
Pipe 1, a diameter of 30 ~ 60cm of ventilation duct 1, pipe thickness is 3 ~ 6cm, and tube pitch is 1 ~ 3 times of caliber.
(3) prefabricated concrete hollow block is arbitrarily stacked between ventilation duct 1, and concrete hollow block is cube or rectangular
Body, the length of side is 6 ~ 30cm, and wall thickness is 2 ~ 6cm.
(4) pipe-massive stone layer 3 is stacked in ventilation duct 1 and 4 top of hollow block layer, block ballast grain sizes are 10 ~ 40cm, fragment rock layers
1 ~ 2m of thickness, then carries out vibratory compaction.
(5) one layer of geotextiles 5 are laid on pipe-massive stone layer 3, top embankment filled soil 6 is then filled and tamps.
In order to verify the effectiveness of the present invention, and contrasted with the effectiveness of prior art, carried out different works
The numerical simulation analysis of journey measure effectiveness, and the frozen soil upper limit distribution under the obtained different operating modes of calculating has been carried out pair
Than such as Fig. 5 ~ 6.Wherein Fig. 5 represents the frozen soil upper limit distribution on the cross section of ventilation duct center, and Fig. 6 represents roadbed centre bit
The frozen soil upper limit put on vertical section is distributed, and " prior art 1 " is the technology of Application No. 200710017288, " existing skill in figure
Art 2 " is the technology of Application No. 201010133544.7.It can be seen that, the relatively current prior art of the present invention, which has, significantly should
With advantage, the natural surface temperature of frozen soil can be greatly reduced, and ensure the globality of temperature-fall period, uniformity.Wherein：
1. in terms of efficiency raising：
Compared to current existing two kinds of analogous technicals, the present invention is greatly improved in the cooling efficiency of cold season, the heat-proof quality of warm season
Also strengthened, therefore, of the invention uses so that the year border cooling efficiency of roadbed is significantly improved compared to current prior art.Figure
5 be frozen soil upper limit on the cross section of roadbed ventilation duct position（I.e. 0 DEG C thermoisopleth）Distribution, in figure it can be seen that, at present two
Plant analogous technical and be merely capable of lifting Lu Zhongzhi Schattenseite bottom frozen soil upper limit, and uplift scope is limited；And near tailo, roadbed
Bottom frozen soil upper limit position is even below natural frozen soil upper limit, and Slopes effect is notable.The present invention can greatly improve roadbed
Cool efficiency, and Schattenseite frozen soil upper limit has small size lifting with respect to other two kinds of technologies.Meanwhile, the present invention can be significantly under lifting tailo
The frozen soil upper limit in portion so that 0 DEG C of thermoisopleth reaches natural adjacent ground surface and keeps level substantially along roadbed cross section, in very great Cheng
The Slopes effect of roadbed is eliminated on degree.
2. in terms of cooling globality：
Fig. 6 is frozen soil upper limit on the vertical section of roadbed center（I.e. 0 DEG C thermoisopleth）Distribution, can see in figure, the present invention
Application cause the relatively current prior art in frozen soil upper limit position to have notable lifting, and its significantly more advantage is：Pipe
Lower and pipe pereletok upper limit position difference very little, the globality highly significant of roadbed temperature-fall period, and other technologies, especially
There is big rise and fall of the frozen soil upper limit buried depth along road-trend in technology 1, the globality of roadbed cooling is very poor.
Because the mechanical strength of frozen soil is affected by temperature significantly, temperature rise is even melted and frozen soil mechanics can be caused strong
That spends is greatly reduced.Therefore, if soil body frozen soil upper limit buried depth is more than the mechanical strength meeting of the soil body between the lower soil body of pipe, pipe between ventilation duct
Significantly reduce, meanwhile, the position is likely to form watershed, may cause road surface under the vehicle dynamic load long term of top
Heaving of the sea, the development in crack, even road frost boiling.Because highway satisfies the need surface evenness and crack has and strictly
Ask, therefore prior art can not meet the construction demand of following highway at present.The application of the present invention enhances roadbed cold
The cooling extent in season, greatly improves the globality of roadbed cooling；Meanwhile, roadbed is strengthened in the heat-proof quality of warm season.It is logical
The use of the present invention is crossed, the cooling efficiency of roadbed can be not only effectively improved, additionally it is possible to greatly improve the entirety of roadbed temperature field
Property, uniformity, there is significant advantage for reducing the possible heaving of the sea in road surface and fracture development.
Claims (5)
1. a kind of compound cold-storage roadbed suitable for permafrost region road engineering, including top embankment filled soil（6）, bottom embankment filled soil
（7）And it is laid in the top embankment filled soil（6）With the bottom embankment filled soil（7）Between and perpendicular to the ventilation of trend of road
Pipe（1）, it is characterised in that：The ventilation duct（1）One or both ends install air door（2）；The adjacent ventilation duct（1）Between spread
If hollow block layer（4）, and the ventilation duct（1）And the hollow block layer（4）On be equipped with pipe-massive stone layer（3）；The pipe-massive stone layer
（3）It is provided with geotextiles（5）, the geotextiles（5）The upper laying top embankment filled soil（6）.
2. a kind of compound cold-storage roadbed suitable for permafrost region road engineering as claimed in claim 1, it is characterised in that：It is described
Ventilation duct（1）Caliber be 30 ~ 60cm, pipe thickness be 3 ~ 6cm, tube center distance is from natural earth's surface（8）Apparent height be 0.5 ~
2.0m。
3. a kind of compound cold-storage roadbed suitable for permafrost region road engineering as claimed in claim 1, it is characterised in that：It is adjacent
The ventilation duct（1）Spacing be the ventilation duct（1）1 ~ 3 times of caliber.
4. a kind of compound cold-storage roadbed suitable for permafrost region road engineering as claimed in claim 1, it is characterised in that：It is described
Hollow block layer（4）Thickness and the ventilation duct（1）Diameter is consistent, and hollow block is by 6 ~ 30cm of the length of side, 2 ~ 6cm of wall thickness coagulation
The cube or cuboid of native precast hollow are constituted.
5. a kind of compound cold-storage roadbed suitable for permafrost region road engineering as claimed in claim 1, it is characterised in that：It is described
Pipe-massive stone layer（3）Particle diameter be that 10 ~ 40cm, laying depth are 1 ~ 2m.
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| CN201610152068.0A CN107201708A (en) | 2016-03-17 | 2016-03-17 | A kind of compound cold-storage roadbed suitable for permafrost region road engineering |
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| CN201610152068.0A CN107201708A (en) | 2016-03-17 | 2016-03-17 | A kind of compound cold-storage roadbed suitable for permafrost region road engineering |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108179669A (en) * | 2017-12-20 | 2018-06-19 | 张昆 | Frozen earth roadbed thermal protection struc ture body and its cooling means |
| CN109680584A (en) * | 2018-12-30 | 2019-04-26 | 张家口路桥建设集团有限公司 | The stable road bed structure and construction technology of the anti-freeze thawing in seasonal frost region |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108179669A (en) * | 2017-12-20 | 2018-06-19 | 张昆 | Frozen earth roadbed thermal protection struc ture body and its cooling means |
| CN109680584A (en) * | 2018-12-30 | 2019-04-26 | 张家口路桥建设集团有限公司 | The stable road bed structure and construction technology of the anti-freeze thawing in seasonal frost region |
| CN109680584B (en) * | 2018-12-30 | 2021-04-13 | 张家口路桥建设集团有限公司 | Freeze-thaw prevention stable roadbed structure in seasonal freezing area and construction process |
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Application publication date: 20170926 |