CN117646355A - Frost-proof high-speed railway base structure of frozen soil area in season - Google Patents
Frost-proof high-speed railway base structure of frozen soil area in season Download PDFInfo
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- CN117646355A CN117646355A CN202410007020.5A CN202410007020A CN117646355A CN 117646355 A CN117646355 A CN 117646355A CN 202410007020 A CN202410007020 A CN 202410007020A CN 117646355 A CN117646355 A CN 117646355A
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- 239000002689 soil Substances 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000000945 filler Substances 0.000 claims abstract description 44
- 239000004567 concrete Substances 0.000 claims abstract description 37
- 239000004746 geotextile Substances 0.000 claims abstract description 27
- 230000009471 action Effects 0.000 claims abstract description 15
- 238000012856 packing Methods 0.000 claims abstract description 15
- 238000013461 design Methods 0.000 claims abstract description 14
- 230000002265 prevention Effects 0.000 claims abstract description 13
- 239000004744 fabric Substances 0.000 claims abstract description 12
- 239000004575 stone Substances 0.000 claims abstract description 11
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 230000001932 seasonal effect Effects 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 208000001034 Frostbite Diseases 0.000 claims 2
- 230000005012 migration Effects 0.000 abstract description 19
- 238000013508 migration Methods 0.000 abstract description 19
- 239000011148 porous material Substances 0.000 abstract description 17
- 201000010099 disease Diseases 0.000 abstract description 9
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 9
- 238000009413 insulation Methods 0.000 abstract description 6
- 230000002829 reductive effect Effects 0.000 abstract description 6
- 239000003673 groundwater Substances 0.000 abstract description 4
- 239000006185 dispersion Substances 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 abstract description 2
- 230000035515 penetration Effects 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 8
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- 238000010276 construction Methods 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 239000011380 pervious concrete Substances 0.000 description 4
- 238000007710 freezing Methods 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 3
- 230000008014 freezing Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
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- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
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Abstract
The invention relates to a high-speed railway foundation structure for preventing frost heaving in a season frozen soil area, which is characterized in that the whole section of the foundation structure is trapezoid, and the design structure sequentially comprises a concrete layer, waterproof geotextile, a graded broken stone layer, a heat preservation layer, an antifreezing A/B filler layer, a common A/B filler layer and a foundation from top to bottom; wherein, a water seepage blind ditch is arranged in the common A/B packing layer, and arc geotextile is paved at the bottom of the common A/B packing layer. The waterproof geotextile prevents water from penetrating from the concrete layer and reduces the water penetration amount into roadbed fillers; the heat insulation layer reduces the temperature gradient in the roadbed by preventing heat transfer, weakens the driving force of groundwater migration to the roadbed, and reduces the moisture migration quantity; the foundation pore water forms hyperstatic pore water pressure under the action of train load, pore water under the hyperstatic pore water pressure migrates along the tangential direction of the arc geotechnical cloth under the dredging of the arc geotechnical cloth, and migration quantity of groundwater into roadbed filling is reduced. The high-speed railway foundation structure integrates the design ideas of frost heaving prevention and treatment of active temperature control and active water dispersion. The invention can reduce the occurrence of frost heaving diseases of the high-speed railway foundation in the frozen soil area and improve the long-term stability of the high-speed railway foundation structure in the frozen soil area.
Description
Technical field:
the invention relates to a high-speed railway foundation structure, in particular to an antifreezing expansion high-speed railway foundation structure in a seasonal frozen soil area.
The background technology is as follows:
most of northern areas in China are season frozen soil areas, and the frost heaving disease of high-speed railways in the season frozen soil areas is an important problem which is troublesome in roadbed construction and safe and stable operation. The high-speed railway base in the season frozen soil area is influenced by the periodic variation of air temperature and the action of the circulating load of the train, the frost heaving deformation of the high-speed railway base is larger and larger, and the high-speed railway base is seriously threatened to the high-efficiency safe operation.
The formation of frost heaving of the high-speed railway foundation is an important follow of taking economic and efficient frost heaving prevention measures. The main reason for frost heaving of the high-speed railway foundation is that the partial condensation ice formed by water migration under the negative temperature gradient damages the original roadbed filler layer structure, so that the roadbed is deformed integrally. The condition that the component ice is formed in the soil body is that moisture always migrates to the vicinity of the freezing front and phase change occurs. The water migration process in the high-speed railway base mainly exists in two forms: under the action of negative temperature gradient, water in roadbed filling migrates to the vicinity of a freezing frontal surface in the form of water vapor; secondly, the circulating load action of the train causes the formation of hyperstatic pore water pressure in a saturated soil body below the ground water level at the lower part of the high-speed railway foundation, and when the train passes through, the hyperstatic pore water pressure promotes the migration of water into roadbed filling materials, increases the water content of the high-speed railway foundation filling materials and promotes the continuous growth of the separated ice (documents Cheng Daichao and Zhang Sheng, lexi. Interaction mechanism of the high-speed train and roadbed frost heaving [ J ]. Geotechnical engineering report, 2013,35 (12): 2186-2191).
The key to solve the frost heaving disease of the high-speed railway foundation is to prevent the formation of condensed ice in the roadbed filling layer. According to the frost heaving disease forming reason, the design thought of the measures for efficiently preventing and treating the frost heaving is as follows: (1) Controlling the temperature of roadbed filling materials, weakening the driving effect of negative temperature gradients on water and reducing the migration quantity of water to the roadbed filling materials; (2) The process of driving water to migrate to the roadbed filler by the hyperstatic pore water pressure caused by train load is dredged, the water migration path is changed, the water migration quantity to the roadbed filler is reduced, and the formation of segregated ice in the roadbed filler is prevented. Although patents such as "frost heaving prevention structure of a roadbed in a seasonal frozen soil area and a paving method thereof", "railway frost damage prevention embankment structural design of a permafrost area", "a novel road roadbed structure of a permafrost area", "a novel nano hot bar high-speed railway roadbed for preventing frost heaving of a roadbed in a seasonal frozen soil area", "a heat-insulating high-speed railway roadbed bed of a frozen soil area", and the like and documents "Cheng Daichao, zhang Sheng, and li.
The invention comprises the following steps:
aiming at the frost heaving disease of the high-speed railway base in the seasonal frozen soil area, the invention aims to provide the high-speed railway base structure for preventing the frost heaving disease in the seasonal frozen soil area by combining the frost heaving disease forming mechanism, and the structure can reduce the influence of the frost heaving disease on the deformation and damage of the high-speed railway base and improve the long-term stability of the high-speed railway base.
In order to achieve the aim of the invention, the invention provides an antifreezing expansion high-speed railway foundation structure in a seasonal frozen soil area, wherein the cross section of the roadbed structure is trapezoidal, a concrete layer, waterproof geotextile, a graded gravel layer, a heat preservation layer, an antifreezing A/B filler layer, a common A/B filler layer and a foundation are sequentially arranged from top to bottom.
3 seepage blind ditches are paved on the foundation, and arc geotextile is paved between two adjacent seepage blind ditches; paving common A/B filler on the arc geotextile; an antifreezing A/B filler is paved on the common A/B filler; an insulating layer is paved on the antifreezing A/B filler; a graded broken stone layer is paved on the heat preservation layer; a waterproof geotextile is paved on the graded broken stone layer; and a concrete layer is paved on the waterproof geotextile.
The water seepage blind ditch is a concrete prefabricated structure and is formed by connecting an impermeable triangular concrete structure on the upper part and an impermeable concrete arc-shaped groove on the bottom.
The pervious concrete arc-shaped groove is provided with the pervious holes, so that the pervious concrete arc-shaped groove can penetrate liquid water.
The particle sizes and the paving thicknesses of the graded broken stone layer, the antifreezing A/B packing layer and the common A/B packing layer are in accordance with the design specifications of related high-speed railway bases.
The heat-insulating layer is a hard heat-insulating plate and has the function of preventing heat exchange between the ground and the interior of the roadbed and reducing the absolute value of the temperature gradient in the roadbed filling.
The position of the water seepage blind ditches in the horizontal direction should not be arranged in a vertical action area of the train load, and the center distance between two adjacent water seepage blind ditches is at least greater than the vertical action range of the train load.
The filler below the permeable concrete arc-shaped groove is common A/B filler, and the thickness of the common A/B filler layer at the position is 20 cm-30 cm.
The arc geotextile and the waterproof geotextile have the characteristics of high-efficiency waterproof performance and long service life, and are not limited to common geotechnical waterproof materials.
The invention has the characteristics and advantages that:
1. when the train load acts, the arc geotechnical cloth paved at the bottom of the common A/B packing layer can dredge liquid water under the action of hyperstatic pore water pressure to migrate to the two sides of the central axis of the arc geotechnical cloth, and part of liquid water is guided to migrate to the water seepage blind ditches.
2. The infiltration blind ditch can store the liquid water that is dredged and moved by the arc geotechnical cloth under the action of the hyperstatic pore water pressure, the water migration quantity in the roadbed filling is reduced, and the liquid water is migrated into the infiltration blind ditch through the permeable concrete arc-shaped groove at the bottom of the infiltration blind ditch.
3. According to the invention, the hard heat-insulating plate is paved above the anti-freezing A/B packing layer to prevent heat transfer, so that the influence of the temperature gradient effect on moisture migration is weakened; meanwhile, a water seepage blind ditch and an arc geotextile are paved to dredge the migration process of water to the roadbed under the action of hyperstatic pore water pressure caused by train load. The frost heaving prevention and control high-speed railway base structure is a comprehensive embodiment of the design thought of active temperature control and active water dispersion frost heaving prevention and control, and can greatly reduce the influence of frost heaving diseases on the stability of the high-speed railway base.
4. After the load of the train disappears, the hyperstatic pore water pressure in the foundation soil is dissipated, and the water flowing into the water seepage blind ditch under the action of the hyperstatic pore water pressure flows back into the foundation soil through the permeable concrete arc-shaped groove at the bottom of the water seepage blind ditch, so that the settlement damage to the foundation caused by the loss of underground water is reduced.
Drawings
In order to more specifically describe the technical scheme of the invention, the following is further detailed with reference to the accompanying drawings:
FIG. 1 is a schematic cross-sectional view of a high-speed railway foundation structure for preventing frost heaving in a seasonal frozen soil area in an embodiment;
FIG. 2 is a schematic view of a construction of a weeping blind drain provided in a common A/B filler layer in an embodiment;
icon: 1-a rail; 2-a concrete layer; 3-water-proof geotextile; 4-graded crushed stone layer; 5-an insulating layer; 6-an antifreezing A/B filler layer; 7-a common A/B filler layer; 8-water seepage blind ditches; 9-arc geotextile; 10-foundation; 11-a water-impermeable triangular concrete structure; 12-permeable concrete arc-shaped grooves.
Specific example mode:
referring to fig. 1 and 2 in combination, the invention provides an anti-frost-heave high-speed railway foundation structure for a seasonal frozen soil area, which comprehensively adopts the design ideas of active temperature control and active water dispersion, can effectively reduce the water migration quantity to roadbed filling materials under the action of temperature gradient and train load, can obviously prevent the formation of segregated ice in the seasonal frozen soil area high-speed railway foundation filling materials, effectively prevent the frost heave deformation of the high-speed railway foundation and improve the stability of the seasonal frozen soil area high-speed railway foundation.
The construction process of the invention is as follows:
step A: leveling and compacting foundation soil 10;
and (B) step (B): digging a groove for paving arc geotechnical cloth on the foundation 10 according to the design line of the roadbed, and paving arc geotechnical cloth 9;
step C: 3 pervious concrete arc grooves 12 are paved at two ends of the arc geotextile 9, and a layer of common A/B filler 7 with the thickness of 20cm is paved below the 3 pervious concrete arc grooves 12;
step D: a waterproof triangular concrete structure 11 is spliced on the permeable concrete arc-shaped grooves 12 at the bottom of the 3 seepage blind ditches 8;
step E: paving common A/B filler 7 on the arc geotextile 9 and the waterproof triangle concrete structure 11, wherein the thickness of the common A/B filler is implemented according to the design specification of a high-speed railway foundation;
step F: an antifreezing A/B filler 6 is paved on the common A/B filler 7, and the thickness of the antifreezing A/B filler is executed according to the design specification of the high-speed railway foundation;
step G: a heat preservation layer 5 is paved on the antifreezing A/B filler 6;
step H: paving a layer of graded broken stone layer 4 on the heat preservation layer 5, wherein the paving thickness is implemented according to the design specification of a high-speed railway foundation;
step I: paving a layer of waterproof geotextile 3 on the graded broken stone layer 4;
step J: a concrete layer 2 is paved on the waterproof geotextile, and the paving thickness is executed according to the design specification of the high-speed railway foundation;
examples
As shown in fig. 1, the structure of the frost heaving prevention high-speed railway foundation in the seasonal frozen soil area is sequentially provided with a concrete layer 2, waterproof geotextile 3, graded broken stone layer 4, a heat preservation layer 5, an antifreezing A/B packing layer 6, a common A/B packing layer 7 and a foundation 10 from top to bottom.
And a water seepage blind ditch 8 is arranged at the interface of the common A/B packing layer 7 and the foundation 10, and an arc geotextile 9 is paved between two adjacent water seepage blind ditches 8.
The gradient of the pavement of the concrete layer 2 is not less than 4%, and the gradient of the two sides of the roadbed structure is 1:1.75.
The waterproof geotextile 3 is paved below the concrete layer, and has the effects of mainly preventing moisture from the concrete layer from penetrating into the roadbed filler, reducing the moisture content in the roadbed filler and effectively restraining frost heaving in the roadbed filler.
The selection of the grain sizes and the thicknesses of the graded broken stone layer 4, the antifreezing A/B filler 6 and the common A/B filler 7 is required to be carried out according to the design specification of the high-speed railway foundation in combination with the actual condition of the roadbed. Wherein the antifreezing A/B filler 6 has the function of inhibiting the migration of liquid water in the roadbed and preventing the formation of condensed ice in the roadbed filler.
The hard insulation board is paved on the insulation layer 5, the hard insulation board is paved below the waterproof geotextile of the roadbed slope, the thickness of the hard insulation board is 80mm, the insulation board with higher thermal resistance can prevent heat exchange between the environment and the roadbed, the temperature gradient inside the roadbed is reduced, the driving effect of the temperature gradient on moisture migration in the roadbed is weakened, the moisture migration in the roadbed is reduced to roadbed filling materials, the formation of partial ice in the roadbed filling materials is effectively restrained, and the occurrence of frost heaving deformation of the roadbed is prevented.
In order to ensure the bearing performance of the roadbed, three water seepage blind ditches 8 are arranged at the bottom of the common A/B packing layer 7, the positions of the water seepage blind ditches 8 in the horizontal direction are not arranged in a vertical action area of the train load, and the center distance between two adjacent water seepage blind ditches 8 is at least greater than the vertical action range of the train load. In the vertical direction, the impermeable triangle concrete structure 11 at the upper part of the permeable blind ditch 8 is in the common A/B filler layer 7, and the permeable concrete arc-shaped groove 12 at the bottom of the permeable blind ditch 8 is in the soil of the foundation 10.
The size of the water seepage blind ditch 8 is determined according to the ground water and the actual condition of the maximum load of the roadbed under the premise of ensuring that the bearing performance of the roadbed is met.
As shown in fig. 2, the water seepage blind ditch 8 is a schematic structure, and the water seepage blind ditch 8 is formed by connecting an upper water impermeable triangle concrete structure 11 and a bottom water permeable concrete arc-shaped groove 12. The water seepage blind ditch 8 is a concrete prefabricated structure, and is connected in sequence in the construction process.
In addition, the triangular water seepage blind ditch 8 is arranged to strengthen the strength so that the water seepage blind ditch can bear the upper load, and the water seepage holes penetrating through the water seepage blind ditch 8 are formed by punching the water seepage concrete arc-shaped grooves 12 at the bottom of the water seepage blind ditch 8 so that the water seepage blind ditch can permeate liquid water. In order to avoid that slurry in the foundation 10 blocks the water permeable holes of the permeable concrete arc-shaped grooves 12 at the bottom of the water permeable blind ditches 8 as much as possible, a layer of common A/B filler 7 with the thickness of 20cm is paved below the permeable concrete arc-shaped grooves 12.
Arc geotechnical cloth 9 laid at the bottom of ordinary A/B packing layer 7, when the train load acts on the road bed, the saturated pore water at ground 10 forms super quiet pore water pressure, and the effect of arc geotechnical cloth 9 is to dredge the liquid water migration under the super quiet pore water pressure effect to the both sides of arc geotechnical cloth 9 axis, and the migration of guide part liquid water is to infiltration blind ditch 8, prevents the migration of liquid water to the road bed packing layer, suppresses the formation of the partial ice that congeals in the road bed packing layer, reduces road bed frost heaving and warp.
When no train passes through the roadbed track, the train load effect disappears, the hyperstatic pore water pressure in the foundation 10 dissipates, and the liquid water which migrates into the seepage blind ditch 8 due to the hyperstatic pore water pressure effect permeates back into the foundation 10 through the permeable concrete arc-shaped groove 12, so that the roadbed settlement caused by the loss of the liquid water in the foundation is avoided, and the long-term stability of the high-speed railway roadbed is ensured.
Claims (8)
1. The utility model provides a high railway base structure that expands prevents frostbite in frozen soil district in season, includes concrete layer (2), water proof geotechnique cloth (3), graded gravel layer (4), heat preservation (5), prevent frostbite A/B packing layer (6), ordinary A/B packing layer (7), arc geotechnique cloth (9), ground (10), its characterized in that: the cross section of the roadbed structure is trapezoid; 3 seepage blind ditches (8) are paved on the foundation (10), and arc geotextile (9) is paved between two adjacent seepage blind ditches (8); a common A/B filler (7) is paved on the arc geotextile (9); an antifreezing A/B filler (6) is paved on the common A/B filler (7); an insulating layer (5) is paved on the antifreezing A/B filler (6); a graded broken stone layer (4) is paved on the heat preservation layer (5); a waterproof geotextile (3) is paved on the graded broken stone layer (4); and a concrete layer (2) is paved on the waterproof geotextile (3).
2. The high-speed railway foundation structure for preventing frost heaving in a seasonal frozen soil area according to claim 1, wherein the water seepage blind ditch (8) is a concrete prefabricated structure and is formed by connecting an upper water-impermeable triangle-shaped concrete structure (11) and a lower water-permeable concrete arc-shaped groove (12).
3. A seasonal frozen soil area frost heaving prevention high-speed railway foundation structure as claimed in claim 2, wherein the permeable concrete arc-shaped groove (12) is provided with permeable holes so as to be permeable to liquid water.
4. The seasonal frozen soil area frost heaving prevention high-speed railway foundation structure as claimed in claim 1, wherein the grain sizes and the laying thicknesses of the graded gravel layer (4), the frost-proof A/B filler layer (6) and the common A/B filler layer (7) are in accordance with the design specifications of the related high-speed railway foundation.
5. A seasonal frozen soil area frost heaving prevention high-speed railway foundation structure as claimed in claim 1, characterized in that the heat-insulating layer (5) is a hard heat-insulating plate which is used for preventing heat exchange between the ground and the interior of the roadbed and reducing the absolute value of the temperature gradient in the roadbed filling.
6. A seasonal frozen soil area frost heaving prevention high-speed railway foundation structure as claimed in claim 1 or 2, characterized in that the horizontal position of the water seepage blind ditches (8) is not arranged in a vertical action area of the train load, and the center distance between two adjacent water seepage blind ditches (8) is at least larger than the vertical action range of the train load.
7. A seasonal frozen soil area frost heaving prevention high-speed railway foundation structure as claimed in claim 3, wherein the filler below the permeable concrete arc-shaped groove (12) is a common a/B filler layer (7), and the thickness of the common a/B filler layer (7) is 20 cm-30 cm.
8. The seasonal frozen soil area frost heaving prevention high-speed railway foundation structure according to claim 1, wherein the arc geotextile (9) and the waterproof geotextile (3) have the characteristics of high-efficiency waterproof performance and long service life, and are not limited to common geotechnical waterproof materials.
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| CN116676822A (en) * | 2023-06-06 | 2023-09-01 | 中国路桥工程有限责任公司 | Saline soil roadbed structure considering freeze thawing cycle effect and construction method |
| CN116876455A (en) * | 2023-08-24 | 2023-10-13 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Geotextile filling construction and quality control method for railway roadbed foundation bed |
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