CN109736141A - The anti-freeze expansion structural body and paving method of Railway Roadbed in Permafrost Regions - Google Patents
The anti-freeze expansion structural body and paving method of Railway Roadbed in Permafrost Regions Download PDFInfo
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Abstract
The invention discloses the anti-freeze expansion structural bodies and paving method of a kind of Railway Roadbed in Permafrost Regions, wherein anti-freeze expansion structural body, including roadbed and it is located at the side slope of embankment of roadbed two sides, roadbed has been sequentially filled 5% cement stabilized graded macabam layer from surface layer of subgrade bed to bottom layer of subgrade, medium-sand seam, folder is layered on one layer of waterproof geotextiles between medium-sand seam, non-frost heave A, B group soil layer；Bottom layer of subgrade two sides are equipped with water seepage mechanism, are equipped with soakaway trench in each water seepage mechanism.Using paving method of the invention, the anti-freeze expansion structural body of making, the lower row of envelope in realization, surface layer of subgrade bed is taken change filling out containing 5% cement stabilized graded macabam, it blocks surface water to penetrate into from surface layer of subgrade bed, while the water seepage mechanism that bottom layer of subgrade two sides are added, strengthens subgrade bed drainability.Therefore water source is effectively deflected from roadbed by the present invention, guarantees that subgrade in permafrost soil zone and cutting by ground, the erosion of underground water, do not effectively prevent the generation of permafrost area embankment frost heave, thaw collapse disease.
Description
Technical field
The present invention relates to Construction Technique of Railway Subgrade field more particularly to a kind of anti-freeze expansions of Railway Roadbed in Permafrost Regions
Structural body and paving method.
Background technique
With the fast development of railway construction in China cause, railway projects Xiang Gaowei, high and cold technological difficulties successively in recent years
Area extension.Occur again and again in bad subgrades diseases such as high and cold Permafrost Area railway construction frost heave, thaw collapses.Roadbed frost damage produces
Raw reason is mainly subgrade drainage in winter by low temperature effect, and the higher water of temperature is shifted to the lower soil layer direction of temperature,
Under the effect of temperature difference polywater, moisture is assembled rapidly and gradually forms poly- ice sheet.Therefore how row is taken in this area's newly built railway
Effective prevention frost failure measure and occur frost failure when how this is handled, be the technology of extremely frigid zones construction of railways
Problem.
In to build Xinjiang to build the good railway in Kazakhstan that work (group) Co., Ltd undertakes the construction of be first railway that group company builds, item
Mesh is located in the domestic forestry reserve in motherland, Harbin, Heilongjiang Province Fangzheng County, northeast, and most time is in frozen soil in 1 year
Season.For the generation for preventing roadbed frost damage disease, it is usually taken and selects suitable roadbed filling, reinforced platoon when roadbed substrate is changed and filled out
Drainage facility and addition geotextile constitute the modes such as reinforced earth to prevent and treat；Although these measures are to ensure that subgrade stability is effectively anti-
The generation for controlling freeze injury plays good effect, but because construction site is located in forest zone, lithic drainage is abundant, inevitably can also be because of underground
River system change causes roadbed frost damage.
Summary of the invention
In view of the above deficiencies, the technical problems to be solved by the present invention are: providing a kind of Railway Roadbed in Permafrost Regions
Anti-freeze expansion structural body and paving method solve surface layer of subgrade bed and seep roadbed and subgrade bed water content problems of too under water, from root
The generation of frost heave and thaw collapse disease is prevented in sheet.
In order to solve the above technical problems, the technical scheme is that
A kind of anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions including roadbed and is located at the embankment sides of the roadbed two sides
Slope, the roadbed have been sequentially filled 5% cement stabilized graded macabam layer, medium-sand seam from surface layer of subgrade bed to bottom layer of subgrade, and folder is layered on described
One layer of waterproof geotextiles between medium-sand seam, non-frost heave A, B group soil layer；It is blind that the bottom layer of subgrade two sides are equipped with infiltration
Ditch is equipped with soakaway trench in each water seepage mechanism.
Preferred embodiment is that the side slope of embankment is equipped with the infiltration blind pipe for draining.
Preferred embodiment is that the 5% cement stabilized graded macabam layer is with a thickness of 0.4~0.7m；The medium-sand seam with a thickness of
0.2m；The waterproof geotextiles are according to 600g/m2Standard is laid with；And/or non-frost heave A, the B group soil thickness is
1.7~2.3m.
Preferred embodiment is 1.2~1.6m of french drain bottom width of the water seepage mechanism；Water seepage mechanism depth changes lower than roadbed and fills out bottom
Face is not less than 0.5m；The top of the water seepage mechanism to lateral sulcus platform spreads between thoroughly and is laid with one layer of heat preservation plate, the insulation board
With a thickness of 0.1m, the insulation board is arranged with blotter.
Preferred embodiment is that water seepage mechanism downline road is longitudinally positioned more mouthfuls of spaced inspection shafts, respectively
The inspection shaft is precast assembly structure.
Preferred embodiment is that headwall is arranged in the water outlet of the water seepage mechanism, and heat preservation outlet, institute are provided on the headwall
It states heat preservation outlet surrounding side slope and carries out protective treatment.
The paving method of the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions, comprising the following steps:
Step 1: obtaining the geology and water system in construction area；
Step 2: the roadbed in the construction area successively changes from bottom to up fills out non-frost heave A, B group soil, medium coarse sand and 5% cement grade
With rubble, and waterproof geotextiles are laid in the medium coarse sand；
Step 3: being laid with water seepage mechanism in bottom layer of subgrade two sides, soakaway trench is equipped in each water seepage mechanism.
Preferred embodiment is, in the step 3, be laid with the specific method of water seepage mechanism the following steps are included:
S1, digging groove carry out geology and water system survey to the water seepage mechanism present position before construction, keep the infiltration blind
Ditch and top drainage system coordination；
S2, bottom of trench foundation construction, before filling concrete, groove is cleaned out, and filling concrete is carried out by expansion joint zonal cooling,
Each segmentation inner concrete should have been filled once, if interrupting for some reason, should stay construction joint by code requirement；
S3, installation soakaway trench calculate tube coupling joint location, dig working pit, depth in interface before the soakaway trench installation
Not less than 20 ㎝；It being connected using spigot-and-socket flexible joint, when installation, should be such that tube coupling bellmouth meets to current direction, after hose is in place,
Tube coupling center, elevation should be gradually adjusted to design position, and suitably add native stone cushion block or sandstone to fix in tube coupling two sides；It is described
The multiple permeable holes of interlaced arrangement on the tube wall of soakaway trench, each permeable pitch of holes are not more than 200mm；
S4, trench backfill, after the soakaway trench installation is in place, the pipe shaft two sides of soakaway trench symmetrically backfill graded broken stone, and are layered
Compacting；When trench top backfills fine rock material, tamped from high to low to the placement in layers simultaneously of pipe shaft two sides by substrate drainage direction；
Confining bed is arranged at the top of the ditch of the water seepage mechanism in S5, confining bed construction, using grouting or dry-laid rubble is built, or soil
Work synthesis impervious material is paved into, and rams fill out the clay waterproof layer that thickness is not less than 0.5m on it；There is gutter that can not set on french drain
Confining bed.
Preferred embodiment be further include step S6, loaded filter construction, the confining bed lower section be arranged loaded filter, it is described
Loaded filter selects broken, the gravel placement in layers of even particle size, and adjacent layer particle diameter ratio is not less than 1:4, and thickness is not less than
15 cm, the sand less than 0.15mm partial size should be less than 5%, and bottom of trench longitudinal slope should be greater than 1%.
Preferred embodiment is the 5% cement stabilized graded macabam medium stone, it is desirable that gill shape stone contents should not exceed in particle
20%, matter is soft, breakable stone contents are no more than 10%, and paste and content of organics are no more than 2%, and nonuniformity coefficient U=
D60/D10 is not less than 15, and 0.02mm or less granular mass percentage is not more than 3%.
After adopting the above technical scheme, the beneficial effects of the present invention are:
Due to the anti-freeze expansion structural body and paving method of Railway Roadbed in Permafrost Regions of the invention, wherein anti-freeze expansion structural body,
Including roadbed and it is located at the side slope of embankment of roadbed two sides, roadbed has been sequentially filled 5% cement grade from surface layer of subgrade bed to bottom layer of subgrade
With metalling, medium-sand seam, folder is layered on one layer of waterproof geotextiles between medium-sand seam, non-frost heave A, B group soil layer；Bedding bottom
Layer two sides are equipped with water seepage mechanism, are equipped with soakaway trench in each water seepage mechanism.Using paving method of the invention, making is prevented
Frost heave structural body is realized and is arranged under envelope.Surface layer of subgrade bed is taken change filling out containing 5% cement stabilized graded macabam, blocks surface water from base
Bed surface layer is penetrated into, while the water seepage mechanism that bottom layer of subgrade two sides are added, and strengthens subgrade bed drainability.As it can be seen that of the invention
Water source is effectively deflected from into roadbed, guarantees that subgrade in permafrost soil zone and cutting by ground, the erosion of underground water, do not effectively prevent for many years
The generation of Frozen Ground Area roadbed frost damage, thaw collapse disease.
Since side slope of embankment is equipped with the infiltration blind pipe for draining；Further increase drainability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions of the present invention；
Fig. 2 is the sectional view of sewer in the present invention；
Fig. 3 is the position view of inspection shaft in the present invention；
Fig. 4 is the structural schematic diagram that headwall exports in the present invention；
Fig. 5 is the half plan of headwall water outlet in the present invention；
Fig. 6 is the enlarged cross-sectional view in the direction A-A in Fig. 5；
In figure: 1- cement stabilized graded macabam layer, 2- medium-sand seam, the waterproof geotextiles of 3-, non-frost heave A, the B group soil layer of 4-, the side 5-
Ditch, 6- water seepage mechanism, 7- soakaway trench, 8- blotter, 9- insulation board, 10- lateral sulcus platform, 12- inspection shaft, 120- well lid,
121- well bore, 122- well basis, 13- headwall.
Specific embodiment
Understand to remove the objectives, technical solutions, and advantages of the present invention more, it is with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment one:
As Fig. 1 to Fig. 5 jointly shown in, a kind of anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions, including roadbed and be located at
The side slope of embankment of roadbed two sides, roadbed have been sequentially filled 5% cement stabilized graded macabam layer 1, medium coarse sand from surface layer of subgrade bed to bottom layer of subgrade
Layer 2, folder are layered on one layer of two waterproof geotextiles 3 of one film of cloth between medium-sand seam 2, non-frost heave A, B group soil layer 4；Bottom layer of subgrade
Two sides are equipped with water seepage mechanism 6, are equipped with soakaway trench 7 in each water seepage mechanism 6, are arranged specifically under 5 side platform of lateral sulcus and seep
Water french drain 6, water seepage mechanism tube bottom elevation are not more than -1.3 times of maximum frozen depths of 10 elevation of lateral sulcus platform-caliber -0.25m.
Side slope of embankment is equipped with the infiltration blind pipe for draining.
5% cement stabilized graded macabam layer 1 is with a thickness of 0.4~0.7m；Medium-sand seam 2 is with a thickness of 0.2m；Waterproof geotextiles 3 are pressed
According to 600g/m2Standard is laid with；And/or non-frost heave A, B group soil layer 4 is with a thickness of 1.7~2.3m.
1.2~1.6m of french drain bottom width of water seepage mechanism 6；6 depth of water seepage mechanism is changed lower than roadbed fills out bottom surface not less than 0.5m；
The top of water seepage mechanism to lateral sulcus platform 10 spreads between thoroughly and is laid with one layer of heat preservation plate 9, and insulation board 9 is with a thickness of 0.1m, insulation board 9
It is arranged with blotter.
As shown in figure 3,6 downline road of water seepage mechanism is longitudinally positioned more mouthfuls of spaced inspection shafts 12, it is each to examine
Looking into well 12 is precast assembly structure.In the present embodiment: the circular inspection of a bite is arranged every 30m along route longitudinal direction in water seepage mechanism 6
Well 12 is looked into, inspection shaft 12 uses precast splice type, and it is concrete prefabricated that well lid 120, well bore 121 and well basis 122 are all made of C25.
As shown in Figure 4, Figure 5 and Figure 6, headwall 13 is arranged in the water outlet of water seepage mechanism 6, is provided with and keeps the temperature out on headwall 13
Mouthful, heat preservation outlet surrounding side slope carries out protective treatment.Preferably, the end, top and two sides side slope for keeping the temperature outlet, using plantation
False indigo protection.When sewer excavates, soil property and completely weathered rock location should set support, remaining location should be reinforced observing, if support.
The relative position of headwall 13 is as shown in figure Fig. 4, Fig. 5 and Fig. 6 in this example, and 14 be toe of wall line in figure, and 15 be gutter, and 16 be mixed
Solidifying earth foundation, 17 fill out cohesive soil to ram.
The anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions of the invention, realizes and arranges under envelope.Surface layer of subgrade bed is taken
Change filling out containing 5% cement stabilized graded macabam, blocks surface water to penetrate into from surface layer of subgrade bed, while the infiltration that bottom layer of subgrade two sides are added
French drain 6 strengthens subgrade bed drainability.As it can be seen that water source is effectively deflected from roadbed by the present invention, guarantee subgrade in permafrost soil zone
And cutting effectively prevents the generation of permafrost area embankment frost heave, thaw collapse disease not by ground, the erosion of underground water.
Embodiment two:
As Fig. 1 to Fig. 5 jointly shown in, the paving method of the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions, including following step
It is rapid:
Step 1: obtaining the geology and water system in construction area；
Step 2: the roadbed in construction area successively changes from bottom to up, to fill out native non-frost heave A, B group, medium coarse sand and 5% cement gradation broken
Stone, and waterproof geotextiles 3 are laid in medium coarse sand；Wherein 5% cement stabilized graded macabam medium stone, it is desirable that gill shape is broken in particle
Stone content should not exceed 20%, and matter is soft, breakable stone contents are no more than 10%, and paste and content of organics are no more than 2%,
Nonuniformity coefficient U=D60/D10 is not less than 15, and 0.02mm or less granular mass percentage is not more than 3%.Meet simultaneously, particle
Diameter d≤0.075mm content is not more than 5% (weight ratio), and grain diameter d≤0.075mm content is not more than 7% (weight after compacting
Than)；And its nonuniformity coefficient U=D60/D10 cannot be less than 15,0.02mm or less granular mass percentage is not greater than 3%.In grain
Quality percentage shared by the particle with the plane of disruption is no less than 30% in coarse granule of the diameter greater than 22.4mm.
Surface layer of subgrade bed graded broken stone material property: Los Angeles rate of wear that partial size is greater than 1.7mm particle is not more than 30%；Grain
The metabisulfite solution soak loss rate that diameter is greater than 1.7mm particle is not more than 6%；Partial size is little greater than the fine grain liquid limit of 0.5mm
In 25%, plasticity index is less than 6；IV, clay and other impurity must not be contained.
Step 3: being laid with water seepage mechanism 6 in bottom layer of subgrade two sides, soakaway trench 7 is equipped in each water seepage mechanism 6.
In the present embodiment, in step 3, be laid with water seepage mechanism 6 specific method the following steps are included:
S1, digging groove carry out geology and water system survey to 6 present position of water seepage mechanism before construction, make water seepage mechanism 6 and ground
Table drainage system is coordinated；Land drainage is carried out before excavation；When construction is necessary to switch off original sewer pipe, temporary drain should be carried out,
Guarantee draining；Side slope should be modified in work progress at any time, keeps the stability and planarization of side slope；
S2, bottom of trench foundation construction, before filling concrete, groove is cleaned out, and filling concrete is carried out by expansion joint zonal cooling,
Each segmentation inner concrete should have been filled once, if interrupting for some reason, should stay construction joint by code requirement；
S3, installation soakaway trench 7 calculate tube coupling joint location, dig working pit in interface, depth is not before soakaway trench 7 is installed
Lower than 20 ㎝；It is connected using spigot-and-socket flexible joint, when installation should be such that tube coupling bellmouth meets to current direction, after hose is in place, answer
Tube coupling center, elevation are gradually adjusted to design position, and suitably add native stone cushion block or sandstone to fix in tube coupling two sides；Soakaway trench
The multiple permeable holes of interlaced arrangement on 7 tube wall, each permeable pitch of holes are not more than 200mm；
S4, trench backfill, after soakaway trench 7 is installed in place, the pipe shaft two sides of soakaway trench 7 symmetrically backfill graded broken stone, and are layered rammer
Real, every layer of backfill thickness is no more than 20 ㎝；When trench top backfills fine rock material, by substrate drainage direction from high to low to pipe shaft two
The side compacting of placement in layers simultaneously；Dank material should be hard, durable, clean rubble or cobble, should not contain mechanism, clay
Or other harmful substances, wherein viscosity and brittle particle content are no more than 3%, rubble wearing valve is not to be exceeded 50%.
Confining bed is arranged at the top of the ditch of water seepage mechanism 6 in S5, confining bed construction, using grouting or dry-laid rubble is built, or soil
Work synthesis impervious material is paved into, and rams fill out the clay waterproof layer that thickness is not less than 0.5m on it；There is gutter that can not set on french drain
Confining bed.
Step S6, loaded filter is constructed, and loaded filter is arranged in the lower section of confining bed, loaded filter selects even particle size
Broken, gravel placement in layers, adjacent layer particle diameter ratio are not less than 1:4, and thickness is not less than 15 cm, less than the sand of 0.15mm partial size
It should be less than 5%, bottom of trench longitudinal slope should be greater than 1%.It, should be first in bottom and two sides in the present embodiment when doing loaded filter using geotextile
Furrow bank is completed in place, and geotextile needed for reserved top covering, is straightened and is smoothly close to underlayer, all vertical or horizontal
Overlapping the slot should be alternately arranged, and the geotextiles lap of splice and indices should meet design and associated specifications requirement.
The construction material table of the present embodiment is as follows:
Water seepage mechanism fills crushing technique index in the present embodiment, see the table below:
| Project | Test rating |
| Parent rock intensity | Not less than 30MPa |
| Ballast grain sizes | 3cm~8cm |
| Clay content (by weight) | <2% |
The paving method of the anti-freeze expansion structural body of the Railway Roadbed in Permafrost Regions of invention has following compared with prior art
Advantage:
1, by reasonably selecting construction method, careful mobilization has timely and effectively handled the generation of extremely frigid zones roadbed
Frost failure situation not only substantially reduces the duration, and reduces construction cost；Construction finish through cost accounting it is total reduce at
About 2,000,000 yuan of this investment；
2, from the point of view of economic benefit angle, by extremely frigid zones it is frozen earth roadbed construction and to occurred frost heave roadbed research,
It summarizes, the freeze injuries disease such as thaw collapse, frost heave, accumulated ice for effectively preventing Cold And Frozen-soil Regions construction to occur again is avoided and done over again
The fund Deng caused by, duration waste, have saved construction cost.
Application example
In Permafrost Area railway construction, China experienced Daxinganling District railway, Qinghai-Tibet Railway, bavin wood railway and Kazakhstan
Big high-speed rail construction provides valuable experience to breathe out building for good railway.But breathe out good railway and be located in Heilongjiang Province, route is worn
More forest zone, the construction under ever-frozen ground environment is extremely complex, and existing construction method and technique are there are also to be improved, only by not
It is disconnected to grope and accumulate, it sums up the more mature other railway projects development & construction of technique and taking experience as fundamental project and company and mentions
For guidance.Construction practices of the good railway bed frost failure processing Jing Guo this engineering method are breathed out, frost heave situation is decreased obviously, subgrade stability
Property improve, in conjunction with later period continuous observation, railway bed quality has larger guarantee.Later construction railroad prevention roadbed is frozen
Swollen, thaw collapse disease has remarkable result.
The preferred embodiment of present invention described above, is not intended to limit the invention, it is all in spirit of the invention and
Within principle it is made it is any modification, etc. same Railway Roadbed in Permafrost Regions anti-freeze expansion structural body and paving method structure
Improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions, including roadbed and it is located at the embankment sides of the roadbed two sides
Slope, which is characterized in that the roadbed has been sequentially filled 5% cement stabilized graded macabam layer, medium coarse sand from surface layer of subgrade bed to bottom layer of subgrade
Layer, folder are layered on one layer of waterproof geotextiles between the medium-sand seam, non-frost heave A, B group soil layer；The bottom layer of subgrade two sides
It is equipped with water seepage mechanism, is equipped with soakaway trench in each water seepage mechanism.
2. the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions according to claim 1, which is characterized in that the embankment
Side slope is equipped with the infiltration blind pipe for draining.
3. the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions according to claim 1, which is characterized in that
The 5% cement stabilized graded macabam layer is with a thickness of 0.4~0.7m；
The medium-sand seam is with a thickness of 0.2m；
The waterproof geotextiles are according to 600g/m2Standard is laid with；And/or
Non- frost heave A, the B group soil thickness is 1.7~2.3m.
4. the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions according to claim 1, which is characterized in that
1.2~1.6m of french drain bottom width of the water seepage mechanism；
Water seepage mechanism depth is changed lower than roadbed fills out bottom surface not less than 0.5m；
The top of the water seepage mechanism to lateral sulcus platform paving thoroughly between be laid with one layer of heat preservation plate, the insulation board with a thickness of
0.1m, the insulation board are arranged with blotter.
5. the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions according to claim 4, which is characterized in that the infiltration
French drain downline road is longitudinally positioned more mouthfuls of spaced inspection shafts, and each inspection shaft is precast assembly structure.
6. the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions according to claim 1 or 5, which is characterized in that described
Headwall is arranged in the water outlet of water seepage mechanism, and heat preservation outlet is provided on the headwall, and heat preservation outlet surrounding side slope carries out
Protective treatment.
7. the paving method of the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions, which comprises the following steps:
Step 1: obtaining the geology and water system in construction area；
Step 2: the roadbed in the construction area successively changes from bottom to up fills out non-frost heave A, B group soil, medium coarse sand and 5% cement grade
With rubble, and waterproof geotextiles are laid in the medium coarse sand；
Step 3: being laid with water seepage mechanism in bottom layer of subgrade two sides, soakaway trench is equipped in each water seepage mechanism.
8. the paving method of the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions according to claim 6, feature exist
In, in the step 3, be laid with the specific method of water seepage mechanism the following steps are included:
S1, digging groove carry out geology and water system survey to the water seepage mechanism present position before construction, keep the infiltration blind
Ditch and top drainage system coordination；
S2, bottom of trench foundation construction, before filling concrete, groove is cleaned out, and filling concrete is carried out by expansion joint zonal cooling,
Each segmentation inner concrete should have been filled once, if interrupting for some reason, should stay construction joint by code requirement；
S3, installation soakaway trench calculate tube coupling joint location, dig working pit, depth in interface before the soakaway trench installation
Not less than 20 ㎝；It being connected using spigot-and-socket flexible joint, when installation, should be such that tube coupling bellmouth meets to current direction, after hose is in place,
Tube coupling center, elevation should be gradually adjusted to design position, and suitably add native stone cushion block or sandstone to fix in tube coupling two sides；It is described
The multiple permeable holes of interlaced arrangement on the tube wall of soakaway trench, each permeable pitch of holes are not more than 200mm；
S4, trench backfill, after the soakaway trench installation is in place, the pipe shaft two sides of soakaway trench symmetrically backfill graded broken stone, and are layered
Compacting；When trench top backfills fine rock material, tamped from high to low to the placement in layers simultaneously of pipe shaft two sides by substrate drainage direction；
Confining bed is arranged at the top of the ditch of the water seepage mechanism in S5, confining bed construction, using grouting or dry-laid rubble is built, or soil
Work synthesis impervious material is paved into, and rams fill out the clay waterproof layer that thickness is not less than 0.5m on it；There is gutter that can not set on french drain
Confining bed.
9. the paving method of the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions according to claim 8, feature exist
In further including step S6, loaded filter construction, loaded filter be arranged in the lower section of the confining bed, the loaded filter selects particle big
Small uniform broken, gravel placement in layers, adjacent layer particle diameter ratio are not less than 1:4, and thickness is not less than 15 cm, are less than 0.15mm
The sand of partial size should be less than 5%, and bottom of trench longitudinal slope should be greater than 1%.
10. the paving method of the anti-freeze expansion structural body of Railway Roadbed in Permafrost Regions according to claim 6, feature exist
In the 5% cement stabilized graded macabam medium stone, it is desirable that gill shape stone contents should not exceed 20% in particle, and matter is soft, breakable
Stone contents are no more than 10%, and paste and content of organics are no more than 2%, and nonuniformity coefficient U=D60/D10 is not less than 15,
0.02mm or less granular mass percentage is not more than 3%.
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| CN110172872A (en) * | 2019-06-12 | 2019-08-27 | 中铁第一勘察设计院集团有限公司 | Plateau hight-ice-content permafrost ground section of railway track chasm structuref and its construction method |
| CN110295571A (en) * | 2019-06-26 | 2019-10-01 | 中国科学院寒区旱区环境与工程研究所 | A kind of Permafrost Area prevents the flow structure that lake is burst |
| CN110409242A (en) * | 2019-08-22 | 2019-11-05 | 中交路桥北方工程有限公司 | A kind of antifreeze water barrier and roadbed |
| CN110424193A (en) * | 2019-08-21 | 2019-11-08 | 中铁第一勘察设计院集团有限公司 | The hollow module chasm structuref of Plateau Permafrost Regions high-speed railway |
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| CN110295571A (en) * | 2019-06-26 | 2019-10-01 | 中国科学院寒区旱区环境与工程研究所 | A kind of Permafrost Area prevents the flow structure that lake is burst |
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| CN110409242A (en) * | 2019-08-22 | 2019-11-05 | 中交路桥北方工程有限公司 | A kind of antifreeze water barrier and roadbed |
| CN111395066A (en) * | 2020-04-28 | 2020-07-10 | 中铁二院工程集团有限责任公司 | Reconstruction structure and construction method for existing railway roadbed underground drainage system |
| CN111979866A (en) * | 2020-08-31 | 2020-11-24 | 西南石油大学 | Roadbed anti-freezing structure in seasonal frozen soil area and construction method thereof |
| CN111979866B (en) * | 2020-08-31 | 2021-11-12 | 西南石油大学 | Roadbed anti-freezing structure in seasonal frozen soil area and construction method thereof |
| CN115198584A (en) * | 2022-06-01 | 2022-10-18 | 吉林市市政建设集团有限公司 | Roadbed laying method for frost heaving soil |
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