CN103966934A - Method for improving frozen stability of highway subgrade in seasonal frozen region - Google Patents
Method for improving frozen stability of highway subgrade in seasonal frozen region Download PDFInfo
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- CN103966934A CN103966934A CN201410181848.9A CN201410181848A CN103966934A CN 103966934 A CN103966934 A CN 103966934A CN 201410181848 A CN201410181848 A CN 201410181848A CN 103966934 A CN103966934 A CN 103966934A
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- 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
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Abstract
The invention discloses a method for improving the frozen stability of a highway subgrade in a seasonal frozen region. According to the method, double subgrade isolating layers (namely an upper isolating layer and a lower isolating layer) of the subgrade is adopted, wherein the lower isolating layer is used for isolating capillary water under the maximal highway frozen depth for many years and reducing ice gathering amount of a subgrade soil body to the utmost extent; meanwhile, the upper isolating layer is used for isolating pavement water seepage at the top of the subgrade and draining water horizontally; the upper isolating layer and the lower isolating layer act together to realize a long-term stability purpose of the subgrade. By the adoption of the double-isolating-layer technology, water stability and the frozen stability of the subgrade can be well effectively ensured, so that deficiencies in the design of highways in cold areas in China can be made up.
Description
Technical field:
What the present invention relates to is a kind of for improving the method for the freezing stability of highway in seasonal frost region roadbed.
Background technology:
China's frozen soil distributes wide, 2,150,000 square kilometres of Permafrost Area areas, and Frozen Area is 513.7 ten thousand square kilometres, both sums account for 75% of area.Genus seasonal freezing region, northern China most areas, winter, along with the decline of atmospheric temperature, in the heat exchanging process of ground-gas, when soil temperature drops to the crystalline temperature of native pore water, the soil body just freezes, and native pore water and the migration water from extraneous water source will there will be ice crystal.Under negative temperature difference influence, moisture moves up and forms poly-ice sheet.Under the condition that has water recharging, poly-ice sheet is constantly thickeied, and causes soil body volume expansion, produces subsidiary stress and distortion, i.e. frost heaving.It will cause that subgrade stability weakens, even surface deformation cracking.To spring, along with the rising of temperature, the soil body after freezing starts from upper strata to melt, but the lower floor of frozen soil layer not yet dissolves, moisture cannot ooze down, makes the increase of soil body water content, strength decreased, at this moment, usually there is the thaw collapse such as roadbed settlement and road frost boiling phenomenon, affect traffic safety.In a word, no matter freeze or melt, all the deteriorated of surface evenness will be caused, the destruction of subgrade strength, the safety and stablization of engineering works in serious threat, caused potential safety hazard to the highway especially normal operation of speedway, the improvement after its destruction also needs to spend huge energy and financial resources.
Subgrade defect has disguise, latency, and this is to be determined by roadbed residing specific position in road structure.Roadbed requires to have enough strong (just) degree and stability as the basis on road surface.For seasonal frost region frozen soil, all to experience freeze thawing repeatedly every year, the intensity on roadbed and stability have serious impact, and therefore roadbed freeze-harm incidence is higher compared with Permafrost Area.Subgrade strength is the foundation of pavement design, also be the principal element that determines road surface supporting capacity and structural integrity, for flexible pavement, 70%～95% flexure depends on roadbed, and the differential settlement that roadbed produces after being completed can directly cause the rapid decay of surface evenness and the destruction of road structure, early stage infringement of highway in China is for a long time general, serious just for this, one of major reason that highway application life is partially short.
Water translocation is the direct factor that produces frost heave, face from the threat of the water of (part highway), side slope, the long-term ponding in earth's surface and underground water etc. and freezing threat between road surface, roadbed and road surface, we often lack effective safeguard, the strength retrogression of some roadbeds is rapid, some side slope slumps are heavier, and further cause early damage to pavement serious.For highway in seasonal frost region, roadbed dampness is the principal element that determines road surface supporting capacity, is the important evidence that subgrade strength design value, Pavement Structure are selected.It determines by its residing environment, as the Precipitation and evaporation of summer and autumn, and the temperature in winter and gradient thereof, freeze thawing and frost heave action, especially freeze the long-term ponding of front underground water and earth's surface etc.In the middle of the humidity of subgrade soils, temperature, soil property three, the variation of humidity is the main cause that subgrade strength changes.The freezing stabilization technique of research roadbed, maintaining its moisture stable is prerequisite, this is freezing stable for ensureing seasonal frost region roadbed, controls roadbed inhomogeneous deformation, improves roadbed durability particularly important.
In order to limit the water translocation of frozen soil, ensure the freezing stability of roadbed, in current Chinese code of practice, adopt critical height of subgrade and minimum height of fill control roadbed dry and wet state, with antifreeze layer thickness index control design, in addition, " bituminous pavement design for highway specification " regulation, the section of roadbed in following situation should arrange bed course: 1. groundwater table is high, impeded drainage, roadbed is the section in dampness often; 2. the soil property cutting of impeded drainage has the bad rock excavation section such as crevice water, spring; 3. seasonal freezing region may produce frost heave in wet, moist section; 4. basic unit may contaminated section.That is to say, be subject to underground water and seasonal frost region climatic factor under affecting in wet, moist section all should establish bed course.Bed course should have certain intensity and good water stability, still needs have good frost resistance in frost region.
But in practical application, find to exist following problem:
Although the setting of bed course can reduce underground water may to what transmit in road structure, but in roadbed, still have the obvious increase of water content, in addition the maximum degree of depth that has deeply generally exceeded bed course of freezing, under the impact of comprehensive freeze thawing, cause the softening and inhomogeneous of road bed, cause the generation of a large amount of diseases.
2. bed course adopts pellet class more at present, and for example gravel or rubble, directly pave on roadbed, increase and drive a vehicle under Gravitative Loads in water content, cause the pollution of subgrade soils to Base with Sand Gravel Cushion, final result has formed the structure that is similar to mud knot rubble, and this has seriously reduced the performance of cushioning effect.
3. highway in China basic unit adopts semi-rigid type base more at present, and drying shrinkage and temperature contracting cracking inevitably can occur this structure in intensity forming process, finally develop into road surfaces with the form of reflection crack, and this will provide the approach oozing under precipitation.That is to say, likely have the possibility of part superficial water infiltration roadbed, and existing Base with Sand Gravel Cushion also cannot stop this part water to infiltrate roadbed.
So, being necessary from top waterproof, the control to subgrade moisture content is strengthened in two aspects that block water, bottom, has ensured Pavement Condition and life-span.
Summary of the invention:
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of for improving the method for the freezing stability of highway in seasonal frost region roadbed.
In order to solve the existing problem of background technology, the present invention by the following technical solutions:
For improving a method for the freezing stability of highway in seasonal frost region roadbed, it is characterized in that, comprise step:
(1) roadbed end face arranges separation layer;
(2) under roadbed, maximum is frozen depths lower separation layer is set for many years.
Further, in described step (1), adopt emulsified asphalt slurry seal; Make both sides and be not less than 0.5% outside longitudinal gradient.
Further, in described step (2), adopt natural gravel or graded gravel, thickness is 150-200mm, and sandy gravel stratum top and bottom all need to cover geotextiles; In gravel, be not more than 5% by 0.075mm sieve aperture granule content; Gravel lower floor subgrade soils degree of compaction is no less than 90%; Sandy gravel stratum degree of compaction is no less than 96%; Lower separation layer bottom surface to the road surface degree of depth need be not less than road for many years maximum freeze deeply.
The present invention contrasts prior art, there is following beneficial effect: the present invention adopts the method for the two separation layers of roadbed, road is maximum for many years to be frozen dark lower capillary water and reduces to greatest extent subgrade soil and gather ice amount for isolating wherein to descend separation layer, go up separation layer for isolating pavement seepage the transverse drainage of roadbed end face, both comprehensive functions are to reaching the object of roadbed long-term stability simultaneously.Adopt two separation layer technology can more effectively ensure subgrade drainage stability and freezing stability, thereby make up the deficiency in China's cold district Road Design.
Brief description of the drawings:
Fig. 1 is two separation layer schematic diagrames.
Detailed description of the invention:
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Fig. 1 is two separation layer schematic diagrames.For improving a method for the freezing stability of highway in seasonal frost region roadbed, comprise step:
(1) roadbed end face arranges separation layer;
(2) under roadbed, maximum is frozen depths lower separation layer is set for many years.
Further, in described step (1), adopt emulsified asphalt slurry seal; Make both sides and be not less than 0.5% outside longitudinal gradient.
Further, in described step (2), adopt natural gravel or graded gravel, thickness is 150-200mm, and sandy gravel stratum top and bottom all need to cover geotextiles; In gravel, be not more than 5% by 0.075mm sieve aperture granule content; Gravel lower floor subgrade soils degree of compaction is no less than 90%; Sandy gravel stratum degree of compaction is no less than 96%; Lower separation layer bottom surface to the road surface degree of depth need be not less than road for many years maximum freeze deeply.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. for improving a method for the freezing stability of highway in seasonal frost region roadbed, it is characterized in that, comprise step:
(1) roadbed end face arranges separation layer;
(2) under roadbed, maximum is frozen depths lower separation layer is set for many years.
2. according to claim 1 a kind ofly it is characterized in that for improving the method for the freezing stability of highway in seasonal frost region roadbed, in described step (1),
Adopt emulsified asphalt slurry seal;
Make both sides and be not less than 0.5% outside longitudinal gradient.
3. according to claim 1 a kind ofly it is characterized in that for improving the method for the freezing stability of highway in seasonal frost region roadbed, in described step (2),
Adopt natural gravel or graded gravel, thickness is 150-200mm, and sandy gravel stratum top and bottom all need to cover geotextiles;
In gravel, be not more than 5% by 0.075mm sieve aperture granule content;
Gravel lower floor subgrade soils degree of compaction is no less than 90%;
Sandy gravel stratum degree of compaction is no less than 96%;
Lower separation layer bottom surface to the road surface degree of depth need be not less than road for many years maximum freeze deeply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410181848.9A CN103966934A (en) | 2014-04-30 | 2014-04-30 | Method for improving frozen stability of highway subgrade in seasonal frozen region |
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| CN201410181848.9A CN103966934A (en) | 2014-04-30 | 2014-04-30 | Method for improving frozen stability of highway subgrade in seasonal frozen region |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104988820A (en) * | 2015-06-17 | 2015-10-21 | 成都科创佳思科技有限公司 | Waterproof reinforced road foundation |
| CN105088911A (en) * | 2015-07-29 | 2015-11-25 | 北京航空航天大学 | Novel runway foundation structure preventing and treating disasters caused by 'pot cover effect' |
| CN105908587A (en) * | 2016-04-28 | 2016-08-31 | 镇江市高等专科学校 | Roadbed thermal insulation construction method in frozen earth area |
| CN109537386A (en) * | 2018-10-31 | 2019-03-29 | 广东省交通规划设计研究院股份有限公司 | Road structure and roadbed construction method |
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| CN104988820A (en) * | 2015-06-17 | 2015-10-21 | 成都科创佳思科技有限公司 | Waterproof reinforced road foundation |
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| CN105908587A (en) * | 2016-04-28 | 2016-08-31 | 镇江市高等专科学校 | Roadbed thermal insulation construction method in frozen earth area |
| CN109537386A (en) * | 2018-10-31 | 2019-03-29 | 广东省交通规划设计研究院股份有限公司 | Road structure and roadbed construction method |
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Application publication date: 20140806 |
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