CN116084227A - Construction method for filling roadbed with expansive soil - Google Patents
Construction method for filling roadbed with expansive soil Download PDFInfo
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- CN116084227A CN116084227A CN202211717510.1A CN202211717510A CN116084227A CN 116084227 A CN116084227 A CN 116084227A CN 202211717510 A CN202211717510 A CN 202211717510A CN 116084227 A CN116084227 A CN 116084227A
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- 239000002689 soil Substances 0.000 title claims abstract description 109
- 238000010276 construction Methods 0.000 title claims abstract description 29
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 31
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 31
- 239000004571 lime Substances 0.000 claims abstract description 31
- 239000004575 stone Substances 0.000 claims abstract description 25
- 230000002787 reinforcement Effects 0.000 claims abstract description 14
- 239000000945 filler Substances 0.000 claims abstract description 10
- 238000009412 basement excavation Methods 0.000 claims abstract description 6
- 239000011440 grout Substances 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 88
- 239000004927 clay Substances 0.000 claims description 14
- 239000011247 coating layer Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 238000005056 compaction Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a construction method for filling roadbed with expansive soil, and relates to the technical field of highway engineering. The construction method for filling the roadbed based on the expansive soil comprises the following specific steps of excavating the roadbed, paving a stone ash layer, paving a gravel layer, paving a lower embankment, paving a reinforcement layer and paving an upper embankment: s1, excavating a roadbed on a construction road section, wherein the depth of the roadbed is 50-120 cm, removing surface soil and wet soft soil layers of the wet land, excavating intercepting ditches at five meters on two sides, and paving a grout masonry; s2, paving a lime layer after roadbed excavation is completed, and leveling the foundation by using a light road roller after a basal plane is dried; s3, paving broken stone above the lime layer after the subgrade base surface is leveled, and leveling the broken stone by using the light road roller again to form a broken stone layer. By adopting the mode of embedding the expansive soil by using the mixed soil, the anti-seepage effect can be greatly improved by matching with the geomembrane, so that the expansive hazard of the expansive soil is greatly reduced, the local expansive soil can be directly used, the use of qualified fillers is reduced, and the economic benefit is improved.
Description
Technical Field
The invention relates to the technical field of highway engineering, in particular to a construction method for filling roadbed with expansive soil.
Background
The expansive clay is high-plasticity clay, has higher bearing capacity, has the characteristics of water absorption expansion, water loss shrinkage, repeated expansion and contraction deformation, water immersion bearing capacity attenuation, dry shrinkage crack development and the like, and has extremely unstable properties. Uneven vertical or horizontal expansion and contraction deformation is often generated in a building, displacement, cracking, inclination and even damage are caused, and the building is often formed in groups, especially a lower-layer flat house is serious, the damage is very large, and the crack is characterized by vertical cracks of an outer wall, oblique cracks at the end part, horizontal cracks under a windowsill, symmetrical or asymmetrical inverted splayed cracks of inner and outer gable walls and the like; the terrace is provided with longitudinal long strips and grid-shaped cracks. Generally, the soil appears in the last half to five years after the building is finished, when the soil is directly used as a filling material of a roadbed body, the soil has a certain influence on the stability and the smoothness of a line, the roadbed structure is likely to be extruded outwards, the pavement structure is cracked and damaged, and the service life of a highway pavement is even influenced when the soil is serious. Therefore, in the existing construction, the utilization of the expanded rock is always abandoned due to the destructiveness of the expanded rock to the filled roadbed and the pavement, so that not only is the problem of residue soil stacking generated in deep excavation cutting or tunnel construction solved, but also the problem of filling and soil taking of the filled roadbed is solved, the environment is greatly influenced and even seriously destroyed by residue soil stacking and the digging of the filling, and meanwhile, the construction cost is increased.
Usually, the expansive soil is used for building railway or highway in areas respectively, and the bridge is mostly adopted for passing. When the roadbed is limited by certain conditions, the roadbed is filled with the filling materials with weak partial expansibility due to regional distribution of the expansion soil, and the diseases are easy to occur if the roadbed is completely filled with the expansion soil, so that the roadbed is filled with the expansion soil to be subjected to chemical improvement, the mixing amount of the modifying agent is mainly determined according to the indoor test mixing ratio, the test section is filled with the modifying agent, and the whole line is popularized and used after the test is qualified, but the construction process of the modified soil filling is complex, the yield of the qualified filling materials is low, the continuous filling is inconvenient, and the construction quality is difficult to control, so that the roadbed design is required to adopt a special structural form, thereby not only eliminating the unfavorable characteristics of the expanded soil filling, ensuring the safety of the roadbed, and improving the economic benefit.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a construction method for filling roadbed with expansive soil, which solves the problems described in the background art.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: the construction method for filling the roadbed by the expansive soil comprises the following specific steps of excavating the roadbed, paving a stone ash layer, paving a gravel layer, paving a lower embankment, paving a reinforced layer and paving an upper embankment:
s1, excavating a roadbed on a construction road section, wherein the depth of the roadbed is 50-120 cm, removing surface soil and wet soft soil layers of the wet land, excavating intercepting ditches at five meters on two sides, and paving a grout masonry;
s2, paving a lime layer after roadbed excavation is completed, and leveling the foundation by using a light road roller after a basal plane is dried;
s3, paving broken stone above the lime layer after the roadbed base surface is leveled, and leveling the broken stone by using the light road roller again to form a broken stone layer;
s4, paving lime-doped modified soil after paving the crushed stone layer to form a paving layer, compacting the paving layer through a light road roller after leveling, and covering an earth work film;
s5, after the soil working film is covered, paving a layer of expansive soil, compacting by using a light road roller, paving again by using mixed soil, compacting by using a heavy road roller, and performing edge-wrapping compaction treatment on two sides of the expansive soil to form an embedded layer;
s6, after forming the embedding layer, paving by using clay and lime mixed soil, and compacting by using a light road roller after paving to form a lower embankment;
s7, after the lower embankment is paved, a reinforcement layer is applied to the upper surface of the lower embankment, the reinforcement layer is paved completely, then a heavy road roller is used for compacting, a coating layer is paved according to the step 5 again, non-expansive soil is paved after the coating layer is paved, and the light road roller is used for compacting to form an upper embankment and cover a soil working film;
s8, after the soil working film is covered, non-expansive soil is used for building slopes on shoulders on two sides, slurry-laid slope protection is paved, and after the slurry-laid slope protection is paved, non-expansive soil is used for filling and lifting a road, and tamping treatment is carried out.
Preferably, in the step 7, the reinforcement layer includes a geogrid and a filler, and the filler is mainly clay or non-expansive soil.
Preferably, the main component of the improved soil is formed by mixing expansive soil with lime, and the mass ratio of lime is 0.08-0.12.
Preferably, the mixed soil is prepared from clay and lime according to the proportion of 1:0.2 mass ratio.
Preferably, the depth of the lower road is the same as the depth of the roadbed, the heights of the lime layer and the crushed stone layer are 10% of the depth of the roadbed, the reinforced layer is 20% of the depth of the roadbed, and the embedded layer is 60% of the depth of the roadbed.
(III) beneficial effects
The invention provides a construction method for filling roadbed with expansive soil. The beneficial effects are as follows:
1. according to the invention, the mixed soil is used for embedding the expansive soil, so that the seepage-proofing effect can be greatly improved by matching with the geomembrane, the expansive hazard of the expansive soil can be greatly reduced, the local expansive soil can be directly used, the use of qualified fillers is reduced, and the economic benefit is improved.
2. According to the invention, the mode of arranging the embedded layers on the upper embankment and the lower embankment respectively is matched with the reinforced layer in the middle, so that the expanded soil layers can be separated in multiple layers, and after water seepage occurs, the expansion multiple of the expanded soil is greatly reduced, and the practicability of the invention is improved.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
as shown in fig. 1, the embodiment of the invention provides a construction method for filling roadbed with expansive soil, which comprises the following specific steps of excavating roadbed, paving a lime layer, paving a gravel layer, paving a lower embankment, paving a reinforcement layer and paving an upper embankment:
s1, excavating a roadbed on a construction road section, wherein the depth of the roadbed is 50-120 cm, removing surface soil and wet soft soil layers of the wet land, excavating intercepting ditches at five meters on two sides, and paving a grout masonry;
s2, paving a lime layer after roadbed excavation is completed, and leveling the foundation by using a light road roller after a basal plane is dried;
s3, paving broken stone above the lime layer after the roadbed base surface is leveled, and leveling the broken stone by using the light road roller again to form a broken stone layer;
s4, paving lime-doped modified soil after paving the crushed stone layer to form a paving layer, compacting the paving layer through a light road roller after leveling, and covering an earth work film;
s5, after the soil working film is covered, paving a layer of expansive soil, compacting by using a light road roller, paving again by using mixed soil, compacting by using a heavy road roller, and performing edge-wrapping compaction treatment on two sides of the expansive soil to form an embedded layer;
s6, after forming the embedding layer, paving by using clay and lime mixed soil, and compacting by using a light road roller after paving to form a lower embankment;
s7, after the lower embankment is paved, a reinforcement layer is applied to the upper surface of the lower embankment, the reinforcement layer is paved completely, then a heavy road roller is used for compacting, a coating layer is paved according to the step 5 again, non-expansive soil is paved after the coating layer is paved, and the light road roller is used for compacting to form an upper embankment and cover a soil working film;
s8, after the soil working film is covered, building slopes on shoulders on two sides by using non-expansive soil, paving slurry-built revetments, after the slurry-built revetments are paved, burying and extracting roads by using the non-expansive soil, and tamping;
according to the invention, the mode of arranging the embedded layers on the upper embankment and the lower embankment respectively is matched with the reinforced layer in the middle, so that the expanded soil layers can be separated in multiple layers, and after water seepage occurs, the expansion multiple of the expanded soil is greatly reduced, and the practicability of the invention is improved.
In the step 7, the reinforcement layer comprises a geogrid and a filler, wherein the filler is mainly clay or non-expansive soil, the main component of the modified soil is prepared by mixing expansive soil with lime, the mass ratio of the lime is 0.08, the cost is low, the drying time is long, and the clay and the lime are mixed according to a ratio of 1:0.2, the anti-seepage effect is greatly improved, the depth of the lower road is the same as the depth of the roadbed, the heights of the lime layer and the gravel layer are 10% of the depth of the roadbed, the reinforced layer is 20% of the depth of the roadbed, and the embedded layer is 60% of the depth of the roadbed.
Embodiment two:
the present embodiment is different from the first embodiment in that: the construction method for filling the roadbed by the expansive soil comprises the following specific steps of excavating the roadbed, paving a stone ash layer, paving a gravel layer, paving a lower embankment, paving a reinforced layer and paving an upper embankment:
s1, excavating a roadbed on a construction road section, wherein the depth of the roadbed is 50-120 cm, removing surface soil and wet soft soil layers of the wet land, excavating intercepting ditches at five meters on two sides, and paving a grout masonry;
s2, paving a lime layer after roadbed excavation is completed, and leveling the foundation by using a light road roller after a basal plane is dried;
s3, paving broken stone above the lime layer after the roadbed base surface is leveled, leveling the broken stone by using the light road roller again to form a broken stone layer, improving the resistance to the deformation of expansive soil after the road is built, forming a water guide layer, being beneficial to underground drainage and reducing seepage-proofing pressure;
s4, paving lime-doped modified soil after paving the crushed stone layer to form a paving layer, compacting the paving layer through a light road roller after leveling, and covering an earth work film;
s5, after the soil working film is covered, paving a layer of expansive soil, compacting by using a light road roller, paving again by using mixed soil, compacting by using a heavy road roller, and performing edge-wrapping compaction treatment on two sides of the expansive soil to form an embedded layer;
s6, after forming the embedding layer, paving by using clay and lime mixed soil, and compacting by using a light road roller after paving to form a lower embankment;
s7, after the lower embankment is paved, a reinforcement layer is applied to the upper surface of the lower embankment, the reinforcement layer is paved completely, then a heavy road roller is used for compacting, a coating layer is paved according to the step 5 again, non-expansive soil is paved after the coating layer is paved, and the light road roller is used for compacting to form an upper embankment and cover a soil working film;
s8, after the soil working film is covered, non-expansive soil is used for building slopes on shoulders on two sides, slurry-laid slope protection is paved, and after the slurry-laid slope protection is paved, non-expansive soil is used for filling and lifting a road, and tamping treatment is carried out.
In the step 7, the reinforcement layer comprises a geogrid and filler, wherein the filler is mainly clay or non-expansive soil, the main components of the modified soil are prepared by mixing expansive soil with lime, the mass ratio of the lime is 0.12, the drying time is shortened, and the clay and the lime are mixed according to the weight ratio of 1: the soil-less cement-based road foundation is formed by mixing the materials according to the mass ratio of 0.2, the depth of the pavement is equal to the depth of the roadbed, the heights of the lime layer and the gravel layer are 10% of the depth of the roadbed, the reinforced layer is 20% of the depth of the roadbed, and the embedded layer is 60% of the depth of the roadbed.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The construction method for filling roadbed with expansive soil comprises the steps of excavating roadbed, paving a stone ash layer, paving a gravel layer, paving a lower embankment, paving a reinforced layer and paving an upper embankment, and is characterized in that: the method comprises the following specific steps:
s1, excavating a roadbed on a construction road section, wherein the depth of the roadbed is 50-150 cm, removing surface soil and wet soft soil layers of the wet land, excavating intercepting ditches at five meters on two sides, and paving a grout masonry;
s2, paving a lime layer after roadbed excavation is completed, and leveling the foundation by using a light road roller after a basal plane is dried;
s3, paving broken stone above the lime layer after the roadbed base surface is leveled, and leveling the broken stone by using the light road roller again to form a broken stone layer;
s4, paving lime-doped modified soil after paving the crushed stone layer to form a paving layer, compacting the paving layer through a light road roller after leveling, and covering an earth work film;
s5, after the soil working film is covered, paving a layer of expansive soil, compacting by using a light road roller, paving again by using mixed soil, compacting by using a heavy road roller, and performing edge-wrapping compaction treatment on two sides of the expansive soil to form an embedded layer;
s6, after forming the embedding layer, paving by using clay and lime mixed soil, and compacting by using a light road roller after paving to form a lower embankment;
s7, after the lower embankment is paved, a reinforcement layer is applied to the upper surface of the lower embankment, the reinforcement layer is paved completely, then a heavy road roller is used for compacting, a coating layer is paved according to the step 5 again, non-expansive soil is paved after the coating layer is paved, and the light road roller is used for compacting to form an upper embankment and cover a soil working film;
s8, after the soil working film is covered, non-expansive soil is used for building slopes on shoulders on two sides, slurry-laid slope protection is paved, and after the slurry-laid slope protection is paved, non-expansive soil is used for filling and lifting a road, and tamping treatment is carried out.
2. The construction method of the expansive soil filled roadbed according to claim 1, wherein the construction method comprises the following steps: in the step 7, the reinforcement layer comprises a geogrid and filler, and the filler is mainly clay or non-expansive soil.
3. The construction method of the expansive soil filled roadbed according to claim 1, wherein the construction method comprises the following steps: the main component of the improved soil is formed by mixing expansive soil and lime, and the mass ratio of lime is 0.08-0.12.
4. The construction method of the expansive soil filled roadbed according to claim 1, wherein the construction method comprises the following steps: the mixed soil is prepared from clay and lime according to the proportion of 1:0.2 mass ratio.
5. The construction method of the expansive soil filled roadbed according to claim 1, wherein the construction method comprises the following steps: the depth of the drop lift is the same as the depth of the roadbed, the heights of the lime layer and the crushed stone layer are 10% of the depth of the roadbed, the reinforced layer is 20% of the depth of the roadbed, and the embedded layer is 60% of the depth of the roadbed.
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| CN202211717510.1A CN116084227A (en) | 2022-12-30 | 2022-12-30 | Construction method for filling roadbed with expansive soil |
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| CN202211717510.1A CN116084227A (en) | 2022-12-30 | 2022-12-30 | Construction method for filling roadbed with expansive soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE743825A (en) * | 1968-12-31 | 1970-06-29 | Rhone Poulenc Textile | |
| CN101343852A (en) * | 2008-08-19 | 2009-01-14 | 中交第二公路勘察设计研究院有限公司 | Method for filling highroad roadbed by waste steel slags |
| CN202466341U (en) * | 2012-03-01 | 2012-10-03 | 长沙理工大学 | Inflation dirt road bed structure |
| CN106758628A (en) * | 2017-01-23 | 2017-05-31 | 中铁第四勘察设计院集团有限公司 | Treatment of Expansive Soil Embankment structure and construction method that the improvement of compound core-spun method is reinforced |
| CN111424480A (en) * | 2020-02-28 | 2020-07-17 | 中交第一公路勘察设计研究院有限公司 | Construction waste improved expansive soil roadbed structure and construction method thereof |
| CN113445396A (en) * | 2021-05-20 | 2021-09-28 | 中铁三局集团广东建设工程有限公司 | High-fill road foundation filling construction method for high liquid limit soil road section |
-
2022
- 2022-12-30 CN CN202211717510.1A patent/CN116084227A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE743825A (en) * | 1968-12-31 | 1970-06-29 | Rhone Poulenc Textile | |
| CN101343852A (en) * | 2008-08-19 | 2009-01-14 | 中交第二公路勘察设计研究院有限公司 | Method for filling highroad roadbed by waste steel slags |
| CN202466341U (en) * | 2012-03-01 | 2012-10-03 | 长沙理工大学 | Inflation dirt road bed structure |
| CN106758628A (en) * | 2017-01-23 | 2017-05-31 | 中铁第四勘察设计院集团有限公司 | Treatment of Expansive Soil Embankment structure and construction method that the improvement of compound core-spun method is reinforced |
| CN111424480A (en) * | 2020-02-28 | 2020-07-17 | 中交第一公路勘察设计研究院有限公司 | Construction waste improved expansive soil roadbed structure and construction method thereof |
| CN113445396A (en) * | 2021-05-20 | 2021-09-28 | 中铁三局集团广东建设工程有限公司 | High-fill road foundation filling construction method for high liquid limit soil road section |
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