CN109811748B - Freeway roadbed processing method in frozen soil area - Google Patents
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- CN109811748B CN109811748B CN201910018415.4A CN201910018415A CN109811748B CN 109811748 B CN109811748 B CN 109811748B CN 201910018415 A CN201910018415 A CN 201910018415A CN 109811748 B CN109811748 B CN 109811748B
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- 238000003672 processing method Methods 0.000 title claims description 3
- 238000011049 filling Methods 0.000 claims abstract description 70
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- 238000002844 melting Methods 0.000 claims abstract description 14
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- 238000003763 carbonization Methods 0.000 claims abstract description 9
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical class [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 5
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Abstract
The invention discloses a method for processing a highway subgrade in a frozen soil area, which comprises the following steps: a. pre-melting frozen earth subgrade in the frozen deep line; b. excavating all the melt soil; c. paving a layer of coarse-grained soil and a reverse filter layer at the bottom of the excavation layer, and paving a lime-soil water-resisting layer and a gravel expansion-guiding layer at two sides; d. filling activated magnesium oxide carbonized and solidified silt soil layer by layer and tamping and reinforcing; e. densely filling embankment filling soil and arranging a coarse particle soil layer containing an XPS heat insulation board below a pavement structure; f. and waterproof protection legs are respectively arranged on two sides of the embankment. The method fully combines the roadbed pre-melting, filling and replacing treatment and the weak soil carbonization and solidification technology in the frozen soil area, effectively strengthens the frozen soil roadbed, well avoids engineering problems of roadbed soil refreezing, frost heaving and the like, further reduces the uneven settlement of the roadbed, and greatly reduces the problem of secondary diseases of the freeways in the cold area. The method has the advantages of economy, environmental protection, safety, high efficiency, strong controllability, easy operation and the like.
Description
Technical Field
The invention relates to the fields of geotechnical engineering and road engineering, in particular to a method for processing a highway subgrade in a frozen soil area.
Background
China is in the third frozen earth country around the world, the perennial frozen earth area of China occupies about 22.3 percent of the national earth area, and the seasonal frozen earth area of China occupies about 53.5 percent; the frozen soil in the cold region can occupy the 'half-wall Jiangshan' of the Chinese native area, and has obvious influence on the Chinese traffic infrastructure. In recent years, with the development of economy in cold regions, the requirements of traffic and infrastructure construction in frozen soil regions are gradually increased, and railways and common public line networks cannot bear the existing traffic volume; meanwhile, in order to protect precious and fragile ecosphere such as "Qinghai-Tibet plateau" and the like and reduce artificial damage as much as possible, a closed expressway is the best choice. However, freeways in frozen soil areas are difficult to construct in the world, and compared with common freeways, the freeways have the advantages that the width of the pavement is increased, the heat absorption capacity is greatly increased, the thermal resistance effect is seriously damaged, the technical content is increased by times, the stability of the freeways is greatly challenged, and the severe highway transportation safety and later-period operation problems are exposed.
The common problems of secondary diseases such as frost heaving, thawing sinking, grout turnover and the like of the pavement of the expressway are solved; the method is fundamentally characterized in that the fluctuation of the upper limit and the lower limit of the frozen soil is caused by the temperature change of the frozen soil roadbed caused by the climate change or the artificial interference. The existing design principle mainly adopts heat preservation measures, and utilizes heat insulation effect to limit or delay the upper limit of permafrost to move downwards so as to protect the permafrost. However, the technology is not mature at present, the development trend of heat budget of the frozen soil covered under the roadbed cannot be changed, and the problem of roadbed freezing injury cannot be radically solved. Therefore, special roadbed structures are adopted, such as typical structures of heat bars, ventilation pipes, stone slabs, heat insulation layers and the like. Most of the treatment methods aim at the existing second-level and following road improvement and disease control in frozen soil areas, and mainly aim at 'road disease control' rather than 'road disease prevention'. The interaction performance, the later service performance, the operation service life and the like of the frozen soil environment in the cold region in the national highway network are also ignored. Therefore, the problem of frozen soil diseases in cold regions can be effectively prevented, and the processing technology for solving the problem of frozen soil of the roadbed in the cold regions and ensuring the stability of the roadbed of the highway in the frozen soil regions needs to be perfected.
The filling and replacing method has simple construction and wide application range, but is difficult to eliminate or reasonably control the frost heaving deformation of the roadbed, needs to perform filling and replacing in the whole or partial freezing depth and has higher requirements on the filling material. The coarse particles are often used as frozen soil roadbed fillers, but practical engineering shows that the coarse particles can only reduce frost heaving of roadbed soil and can cause water migration; after repeated freeze thawing, the water content of the coarse particle filler is increased, so that diseases such as frost heaving, slurry turning, cracking, sinking and the like are induced to the roadbed, and certain threats are formed to the durability and stability of the highway. Therefore, it is a necessary trend to improve roadbed filling materials, namely, common roadbed filling materials in frozen soil areas are improved into materials which have low water content and are not frost heaving sensitive materials. Large areas of marshland are distributed in northeast China, and the formation reasons of the marshland are climate and cold, frozen soil development, low topography and the like. The wetland in the frozen soil area mainly comprises peat soil and silt soil, and is characterized in that the soil is loose, the water content is extremely high, the strength is low, and the hardness is low, so that the wetland can not be used as a roadbed filler. How to effectively utilize peat soil and silt soil in a marsh zone, fully realize resource utilization and change waste into valuables is an engineering problem to be solved by geotechnical engineers at present.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a method for treating a freeway subgrade in a frozen soil area, which aims to overcome the defects and shortcomings of the method for treating the freeway subgrade in the frozen soil area and effectively solve the problem of resource utilization of a marsh land in the frozen soil area.
The technical scheme is as follows: the invention relates to a method for processing a highway subgrade in a frozen soil area, which comprises the following steps:
a. determining a roadbed freezing depth line in a cold region according to a roadbed survey report; selecting a pre-melting method according to the freezing depth and the field conditions, and pre-melting roadbed frozen soil above a freezing depth line, namely all frozen soil in an excavation area ranging from a coarse particle layer to the ground surface;
b. removing all frozen soil in the melting area, and transporting to a storage place;
c. laying a layer of bottom coarse-grained soil at the bottom of the excavated layer, and then laying a layer of inverted filter; simultaneously paving a water-resisting layer and a swelling-guiding layer on two sides of the excavation area;
d. filling silt soil or peat soil solidified by carbonization of active magnesium oxide layer by layer, and tamping and reinforcing;
e. densely filling embankment filling soil and arranging a coarse granular soil filling layer containing an XPS thermal insulation layer below a pavement structure;
f. and waterproof protection feet are respectively arranged on two sides of the embankment.
Wherein,
and selecting winter construction for the frozen soil of the road foundation in the pre-thawing deep frozen line.
And the step of excavating all the frozen soil in the melting area is to continuously excavate the melted soil day and night after the frozen soil is melted, and the gradient ratio of the corresponding excavated area is 1: 0.5-1.
And paving a layer of bottom coarse-grained soil at the bottom of the excavation layer, wherein the filling height is not less than 50 cm.
The reverse filtering layer is paved by pebbles, broken stones and sand fillers in three layers according to the sequence of the particle sizes from large to small.
Paving water-resisting layers on two sides of an excavation area and water-resisting protection feet on two sides of embankment soil, adopting material mixing lime and clay, controlling the corresponding volume ratio to be 3-4: 6-7, and paving the embankment soil to be 30-50 cm thick; the slope toe ratio of the waterproof protection feet on the two sides of the embankment soil is 1: 3-5.
The expansion layer is filled with sand gravel, and the laying thickness is 30-50 cm.
The particle size of the carbonized and solidified silt soil or peat soil is controlled within the range of 1cm-5cm, and particles with small particle size and high filling compactness are suitable.
And filling silt soil or peat soil solidified by carbonization of activated magnesium oxide layer by layer, wherein the filling height of one time is 50-100 cm, and the next filling is carried out after full tamping is ensured.
The XPS thermal insulation layer is spliced by single-layer thermal insulation plates in staggered joint, and the sizes of the thermal insulation plates are uniformly 200cm multiplied by 100cm multiplied by 5 cm; when embankment soil is filled to 80-100 cm below the structural design elevation of the road surface, the road surface is leveled, a coarse-particle soil filling layer is filled, the filling height is not less than 50cm, and a XPS thermal insulation layer is laid in the middle of the coarse-particle soil filling layer.
Has the advantages that: the method fully combines the traditional, simple and feasible pre-melting method, the filling changing method and the novel activated magnesium oxide carbonization and solidification technology, and comprehensively solves the problems of resource utilization of the marsh and shiny lands in frozen soil areas, difficult treatment of the highway subgrade in cold areas and the like by improving the subgrade filling. The carbonization process consumes carbon dioxide continuously, so the method has important environmental protection significance. In addition, carbonized and cured silt soil or peat soil filler is used, and a water-resisting layer, a swelling-guiding layer and a heat-insulating plate are arranged in an auxiliary mode, so that frost heaving and thaw collapse of roadbed soil can be effectively avoided, highway disease prevention is realized, the frost heaving problem of the roadbed soil is limited fundamentally, the stability and durability of a roadbed are improved, and the service performance of a frozen soil highway in a cold region is directly enhanced.
Drawings
FIG. 1 is a schematic view of a freeway subgrade treatment method in a frozen soil area;
in the figure, carbonized and solidified silt soil or peat soil 1, a water-resisting layer 2, a swelling-guiding layer 3, an inverted filter layer 4, bottom coarse-grained soil 5, a water-resisting protection foot 6, a coarse-grained soil filling layer 7, an XPS thermal insulation layer 8, a pavement structure 9, embankment filling 10 and a frozen depth line 11.
Detailed Description
The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.
Example 1:
a method for treating frozen soil highway subgrade in cold region, as shown in figure 1. The method is characterized by comprising the following steps:
a. firstly, determining a roadbed freezing depth line in a cold region according to a roadbed survey report; selecting a proper method according to the freezing depth, the field conditions and the like, selecting winter construction, and preferably adopting an electric heating method or a steam method to pre-melt roadbed frozen soil above a freezing depth line 11, namely all frozen soil in an excavation area ranging from coarse-particle soil 5 to the ground surface.
b. Excavating all frozen soil in the melting area by adopting an excavator, and transporting the melted soil to a storage place by using a soil transporting vehicle, wherein the corresponding excavation gradient is 1: 0.5; the excavation work should continuously excavate the melt earth day and night after the frozen earth melts, so as to avoid re-icing.
c. Paving bottom coarse-grained soil 5 at the bottom of the excavated layer, wherein the filling height is 50cm, and then paving a reverse filter layer 4 in three layers according to the sequence of particle sizes from large to small by adopting pebbles, broken stones and sand fillers; simultaneously, laying a lime-soil water-resisting layer 2 and a gravel expansion-guiding layer 3 on two sides of the excavation area along the excavation surface, wherein the volume ratio of lime in the lime-soil mixing material to clay is 3: 7; the laying thickness of the water-resisting layer 2 and the expansion layer 3 is 30 cm.
d. Filling carbonized and cured silt soil or peat soil 1 layer by layer, wherein the carbonized raw material is taken from a marsh area in a frozen soil region, and the particle size of the particles prepared by carbonization and curing is controlled to be about 1cm-5cm, preferably small and high-filling compactness; and (4) filling the roadbed to a height of 50cm each time, filling the roadbed for the next time after the roadbed is fully tamped, and circularly operating until the roadbed filling is finished.
e. Densely filling embankment filling soil 10, leveling the road surface at a position 100cm below a road surface structure 9, filling a coarse granular soil filling layer 7 with a filling height of 70cm, and arranging an XPS thermal insulation layer 8 in the middle of the coarse granular soil filling layer 7; the XPS thermal-protective coating 8 is formed by splicing heat-insulating plates with the size of 200 multiplied by 100 multiplied by 5cm in a staggered mode.
f. Lime-soil waterproof guard feet 6 are respectively arranged on two sides of the embankment, and the volume ratio of lime-soil mixed material to clay is also 3.5: 6.5; the slope ratio of the lime soil waterproof protection leg 6 is 1: 3.
Example 2:
a method for treating frozen soil highway subgrade in cold region, as shown in figure 1. The method is characterized by comprising the following steps:
a. firstly, determining a roadbed freezing depth line in a cold region according to a roadbed survey report; selecting a proper method according to the freezing depth, the field conditions and the like, selecting winter construction, and preferably adopting an electric heating method or a steam method to pre-melt roadbed frozen soil above a freezing depth line 11, namely all frozen soil in an excavation area ranging from coarse-particle soil 5 to the ground surface.
b. Excavating all frozen soil in the melting area by adopting an excavator, and transporting the melted soil to a storage place by using a soil transporting vehicle, wherein the corresponding excavation gradient is 1: 0.75; the excavation work should continuously excavate the melt earth day and night after the frozen earth melts, so as to avoid re-icing.
c. Paving bottom coarse-grained soil 5 at the bottom of the excavated layer, wherein the filling height is 75cm, and then paving a reverse filter layer 4 in three layers according to the sequence of particle sizes from large to small by adopting pebbles, broken stones and sand fillers; simultaneously, laying a lime-soil water-resisting layer 2 and a gravel expansion-guiding layer 3 along the excavation surface at two sides of the excavation area, wherein the volume ratio of lime in the lime-soil mixing material to clay is 3.5: 6.5; the laying thickness of the water-resisting layer 2 and the expansion layer 3 is 40 cm.
d. Filling carbonized and cured silt soil or peat soil 1 layer by layer, wherein the carbonized raw material is taken from a marsh area in a frozen soil region, and the particle size of the particles prepared by carbonization and curing is controlled to be about 1cm-5cm, preferably small and high-filling compactness; and (4) filling the roadbed to a height of 75cm each time, filling the roadbed next time after the roadbed is fully tamped, and circulating the operation until the roadbed filling is finished.
e. Densely filling embankment filling soil 10, leveling the road surface and filling a coarse granular soil filling layer 7 at a position 90cm below a road surface structure 9, wherein the filling height is 60cm, and arranging an XPS thermal insulation layer 8 in the middle of the coarse granular soil filling layer 7; the XPS thermal-protective coating 8 is formed by splicing heat-insulating plates with the size of 200 multiplied by 100 multiplied by 5cm in a staggered mode.
f. Lime-soil waterproof guard feet 6 are respectively arranged on two sides of the embankment, and the volume ratio of lime-soil mixed material to clay is also 3: 7; the slope ratio of the lime soil waterproof protection leg 6 is 1: 4.
Example 3:
a method for treating frozen soil highway subgrade in cold region, as shown in figure 1. The method is characterized by comprising the following steps:
a. firstly, determining a roadbed freezing depth line in a cold region according to a roadbed survey report; selecting a proper method according to the freezing depth, the field conditions and the like, selecting winter construction, and preferably adopting an electric heating method or a steam method to pre-melt roadbed frozen soil above a freezing depth line 11, namely all frozen soil in an excavation area ranging from coarse-particle soil 5 to the ground surface.
b. Excavating all frozen soil in the melting area by adopting an excavator, and transporting the melted soil to a storage place by using a soil transporting vehicle, wherein the corresponding excavation gradient is 1: 1; the excavation work should continuously excavate the melt earth day and night after the frozen earth melts, so as to avoid re-icing.
c. Paving bottom coarse-grained soil 5 at the bottom of the excavated layer, wherein the filling height is 100cm, and then paving a reverse filter layer 4 in three layers according to the sequence of particle sizes from large to small by adopting pebbles, broken stones and sand fillers; simultaneously, laying a lime-soil water-resisting layer 2 and a gravel expansion-guiding layer 3 along the excavation surface on two sides of the excavation area, wherein the volume ratio of lime in the lime-soil mixing material to clay is 4: 6; the laying thickness of the waterproof layer 2 and the expansion layer 3 is 50 cm.
d. Filling carbonized and cured silt soil or peat soil 1 layer by layer, wherein the carbonized raw material is taken from a marsh area in a frozen soil region, and the particle size of the particles prepared by carbonization and curing is controlled to be about 1cm-5cm, preferably small and high-filling compactness; and (4) filling the roadbed to a height of 100cm each time, filling the roadbed for the next time after the roadbed is fully tamped, and circularly operating until the roadbed filling is finished.
e. Densely filling embankment filling soil 10, leveling the road surface and filling a coarse granular soil filling layer 7 at a position 80cm below a road surface structure 9, wherein the filling height is 50cm, and arranging an XPS thermal insulation layer 8 in the middle of the coarse granular soil filling layer 7; the XPS thermal-protective coating 8 is formed by splicing heat-insulating plates with the size of 200 multiplied by 100 multiplied by 5cm in a staggered mode.
f. Lime-soil waterproof guard feet 6 are respectively arranged on two sides of the embankment, and the volume ratio of lime-soil mixed material to clay is also 4: 6; the slope ratio of the lime soil waterproof protection leg 6 is 1: 5.
It should be noted that the foregoing is only a preferred embodiment of the present invention; it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. A freeway subgrade processing method in frozen soil areas is characterized by comprising the following steps:
a. determining a roadbed freezing depth line in a cold region according to a roadbed survey report; selecting a pre-melting method according to the freezing depth and the field conditions, and pre-melting roadbed frozen soil above a freezing depth line (11), namely all frozen soil in an excavation area ranging from coarse-grained soil (5) to the ground surface;
b. removing all frozen soil in the melting area, and transporting to a storage place;
c. paving a layer of bottom coarse-grained soil (5) at the bottom of the excavated layer, and then paving a layer of inverted filter (4); simultaneously paving a waterproof layer (2) and a guided expansion layer (3) on two sides of the excavation area;
d. filling the silt soil or peat soil (1) subjected to carbonization and solidification by active magnesium oxide layer by layer, and tamping and reinforcing;
e. densely filling embankment filling soil (10) and arranging a coarse-grained soil filling layer (7) containing an XPS thermal insulation layer (8) below a pavement structure (9);
f. waterproof protection feet (6) are respectively arranged on two sides of the embankment;
the XPS thermal insulation layer (8) is spliced by single-layer thermal insulation plates in a staggered joint mode, and the sizes of the thermal insulation plates are uniformly adopted; when embankment filled soil (10) is filled to 80-100 cm below the design elevation of a road surface structure (9), the road surface is leveled, a coarse-particle soil filling layer (7) is filled, the filling height is not less than 50cm, and a XPS thermal insulation layer (8) is laid in the middle of the coarse-particle soil filling layer (7).
2. The method for treating the freeway subgrade in the frozen soil area according to claim 1, wherein the frozen soil of the subgrade in the pre-frozen deep line is constructed in winter.
3. The method for processing the highway subgrade in the frozen soil area according to claim 1, wherein all the frozen soil in the melting area is removed by continuously removing the melted soil day and night after the frozen soil is melted, and the gradient ratio of the corresponding excavation area is 1: 0.5-1.
4. The method for treating the freeway subgrade in the frozen soil area according to the claim 1, wherein a layer of bottom coarse-grained soil (5) is paved at the bottom of the excavated layer, and the filling height is not less than 50 cm.
5. The method for treating the highway subgrade in the frozen soil area according to the claim 1, characterized in that the inverted filter (4) is paved by pebbles, broken stones and sand fillers in three layers according to the order of the particle size from large to small.
6. The method for treating the highway subgrade in the frozen soil area according to the claim 1, wherein water-resisting layers (2) are laid on two sides of an excavated area, water-resisting protection feet (6) are arranged on two sides of an embankment, material mixing lime and clay are adopted, and the corresponding volume ratio is controlled to be 3-4: 6-7, paving the waterproof layer to a thickness of 30-50 cm; the slope toe ratio of the waterproof protection feet (6) arranged on the two sides of the embankment is 1: 3-5.
7. The method for treating the freeway subgrade in the frozen soil area according to the claim 1, wherein the swelling guide layer (3) is filled with sand gravel and is laid to be 30-50 cm thick.
8. The method for treating the highway subgrade in the frozen soil area according to the claim 1, wherein the particle size of the carbonized and solidified silt soil or peat soil (1) is controlled within the range of 1cm-5cm, and particles with small particle size and high filling compactness are preferably used.
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| CN112921726B (en) * | 2021-01-28 | 2022-04-19 | 长安大学 | Roadbed structure capable of preventing roadbed soil from being dry cracked or wet sunk and construction method thereof |
| CN115029976A (en) * | 2022-06-15 | 2022-09-09 | 江苏交水建智能装备研究院有限公司 | Roadbed coverage effect combined prevention and control method based on soil body solidification and partition technology |
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| CA2738146A1 (en) * | 2011-04-21 | 2012-10-21 | John Bandura | Subsurface insulation product and method for installing same |
| CN102493306B (en) * | 2011-12-29 | 2013-12-04 | 中交第一公路勘察设计研究院有限公司 | Construction method of expressway insulating regulation subgrade in permafrost areas |
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