CN111041916A - Roadbed construction method by solidifying earthwork - Google Patents
Roadbed construction method by solidifying earthwork Download PDFInfo
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- CN111041916A CN111041916A CN201911397169.4A CN201911397169A CN111041916A CN 111041916 A CN111041916 A CN 111041916A CN 201911397169 A CN201911397169 A CN 201911397169A CN 111041916 A CN111041916 A CN 111041916A
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- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Abstract
The invention relates to a roadbed construction method for solidifying earthwork, which comprises the following steps: s1, adding a drying agent into the abandoned soil for drying to form a mixed soil material; s2, stacking and stewing the mixed soil in a fixed area; s3, on the day of paving construction, stirring and crushing the mixed soil material after the material stewing process, adding a curing agent in the stirring and crushing process, fully stirring and outputting the construction soil material; and S4, conveying the construction soil to a construction site for paving and rolling. The earthwork-solidified roadbed construction method can fully utilize the abandoned earthwork in site construction, and the abandoned earthwork is processed on site to lay the roadbed, so that the construction cost is low, the construction efficiency is high, and the construction period controllability is good.
Description
Technical Field
The invention relates to the technical field of roadbed construction, in particular to an earthwork curing roadbed construction method.
Background
With the rapid development of the national infrastructure process, the process of expressway and urbanization construction is also rapidly accelerated, and a large amount of urbanization roads and urban expressways need to be constructed. Meanwhile, in the process of urbanization construction, municipal bridge engineering generally has two problems, on one hand, a large amount of slurry is generated in the construction stage of the cast-in-situ bored pile, and the transportation of the slurry generates a large amount of cost and also causes great damage to the marine environment. In the stage of construction of the bearing platform, a large amount of excavated earthwork may be subjected to high additional transportation and disposal costs.
The roadbed construction is different in each region according to the geological condition and the filling material and construction process adopted by the local soil. In areas such as Zhejiang and Fujian, mountainous areas are more, and most of plains are impacted or deposited stratums, so the subgrade construction in the areas mostly adopts slag filling construction, and then slag subgrades are formed. With the continuous enhancement of environmental awareness and the protection requirement on the original ecological environment, the mining resources of the pond resources are greatly reduced, the market supply of the slag is very short, the high-quality slag raw material resources with lower mud content cannot meet a large amount of foundation construction requirements, the shutdown is partially caused by insufficient slag supply in the first construction project, and the material price is continuously increased. In addition, the slag is adopted for roadbed construction, in the construction process, waste earthwork dug out from a road needs to be transported outside and stored, and the purchased slag needs to be transported to a construction area on the basis, so that the transportation cost and the raw material purchasing cost are greatly improved, channels and treatment capacity for outside earthwork transportation and consumption are less and less, and the difficulty in consumption and treatment is greater and greater. In addition, the time for transporting waste earthwork, mud and slag raw materials outside is uncontrollable, so that the controllability of the construction period is poor and the construction efficiency is low.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a method for constructing a roadbed by solidifying earthwork, which can make full use of the waste earthwork in site construction, treat the waste earthwork on site to lay the roadbed, and has the advantages of low construction cost, high construction efficiency and good construction period controllability.
The second technical problem to be solved by the present invention is to provide a method for constructing an earthwork-solidified roadbed, which can avoid the pollution to the surrounding groundwater and soil environment, can improve the compaction degree and the CBR value of the solidified soil mixture, and has small mechanical property attenuation of the soil body and good water stability.
The technical scheme adopted by the invention for solving the first technical problem is as follows: an earth solidification roadbed construction method is characterized in that: the method comprises the following steps:
s1, adding a drying agent into the abandoned soil for drying to form a mixed soil material;
s2, stacking and stewing the mixed soil in a fixed area;
s3, on the day of paving construction, stirring and crushing the mixed soil material after the material stewing process, adding a curing agent in the stirring and crushing process, fully stirring and outputting the construction soil material;
and S4, conveying the construction soil to a construction site for paving and rolling.
In S1, if the waste soil is slurry, adding a drying agent into the waste soil, and drying the slurry by a slurry drying device to obtain a slurry cake with the water content of 35-40% as a mixed soil material;
correspondingly, in S2, the mud cake is piled up and braised in a fixed area, so that the water content of the mud cake is further reduced to below 30%.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the drying agent is quicklime, and the mass ratio of the quicklime as the drying agent in the mixed soil material is 1.5-2.5%;
the curing agent comprises cement, quicklime and mineral powder, wherein the mass ratio of the cement in the construction soil material is 2.5-3.5%, the mass ratio of the quicklime in the construction soil material in the curing agent is 2.5-3.5%, and the mass ratio of the mineral powder in the construction soil material is 0.5-1.5%.
Preferably, the mass ratio of the quicklime serving as the drying agent in the mixed soil material is 2%; the mass ratio of cement in the curing agent in the construction soil material is 3%, the mass ratio of quicklime in the curing agent in the construction soil material is 3%, and the mass ratio of mineral powder in the curing agent in the construction soil material is 1%.
In S1, if the waste soil is clay, adding a drying agent into the waste soil, and stirring and crushing the waste soil by using a crusher, thereby outputting a mixed soil material;
correspondingly, in S2, the mixed soil is piled and braised, so that the water content of the mixed soil is further reduced to below 30%.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the drying agent is quicklime, and the mass ratio of the quicklime as the drying agent in the mixed soil material is 4.5-5.5%;
the curing agent comprises cement and mineral powder, wherein the mass ratio of the cement in the construction soil material is 2.5-3.5%, and the mass ratio of the mineral powder in the construction soil material is 0.5-1.5%.
Preferably, the mass ratio of the quicklime serving as the drying agent in the mixed soil material is 5%; the mass ratio of cement in the curing agent in the construction soil material is 3%, and the mass ratio of mineral powder in the curing agent in the construction soil material is 1%.
In order to improve the bearing capacity of the roadbed, the paving and rolling method of the construction soil material comprises the following steps: clearing the upper surface of the area to be paved; and circularly spreading and rolling the multi-layer construction soil to form the roadbed.
Preferably, before rolling the construction soil, measuring the water content of the construction soil, and if the water content of the construction soil is higher than a set water content threshold value, digging and airing the construction soil by using a rotary cultivator until the water content of the construction soil reaches the set water content threshold value; and if the water content of the construction soil material is lower than the set water content threshold value, the construction soil material is dug by using a rotary cultivator, and water is sprayed on the construction soil material by using a water spraying vehicle until the water content of the construction soil material reaches the set water content threshold value.
Preferably, the paving and rolling work is finished within 6 hours of the construction soil output.
Compared with the prior art, the invention has the advantages that: according to the roadbed construction method for solidifying earthwork, the abandoned earthwork nearby roadbed construction can be selected, drying and solidification treatment of the abandoned earthwork can be carried out on the output place of the abandoned earthwork, and then the treated abandoned earthwork is used for paving and rolling the roadbed.
In addition, when the drying and curing treatment of the abandoned earthwork is carried out, the adopted drying agent and curing agent are inorganic materials, so that the pollution to the surrounding underground water and soil environment can be avoided. In addition, the earthwork is abandoned to be solidified when being spread and rolled, and compared with the conventional earthwork solidification technology that solidification materials are added at one time, the earthwork solidification method carries out solidification twice, so that the compaction degree and the CBR value of the output construction earthwork after being rolled and formed are higher, and the water stability is better.
Drawings
Fig. 1 is a flowchart of a roadbed construction method for curing earthwork in the embodiment of the invention.
Fig. 2 is a construction drawing of a roadbed construction method by earth solidification in the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example one
As shown in fig. 1 and 2, the method for constructing an earth-moving solidified roadbed in the present embodiment includes the following steps:
s1, transporting the abandoned soil from the original position to a fixed processing area nearby, and adding a drying agent into the abandoned soil for drying to form a mixed soil material;
the waste soil is clay, in S1, the drying agent is added into the waste soil, and the waste soil is stirred and crushed by a crusher, so that the mixed soil material is output; the drier is quicklime, and the mass ratio of the quicklime as the drier in the mixed soil is 4.5-5.5%; in the embodiment, the mass percentage of the quicklime serving as the drier in the mixed soil material is 5%, and the quicklime serving as the drier can consume free water in the mixed soil material so as to reduce the water content of the mixed soil material;
s2, stacking and stewing the mixed soil material in a fixed area to further reduce the water content of the mixed soil material to below 30%;
in order to avoid the increase of the water content of the mixed soil material caused by the wetting of the mixed soil material by external factors such as rainwater and the like, the mixed soil material can be placed in a fixed warehouse, in the embodiment, a shed body can be built beside the abandoned soil, and the mixed soil material is stacked below the shed body;
in order to increase the specific surface area of the mixed soil material contacted with air as much as possible, the water content of the mixed soil material is reduced to the range required by the design in a short time, and the stacking height of the mixed soil material is not more than 3 m;
s3, on the day of paving construction, stirring and crushing the mixed soil material after the material stewing process, adding a curing agent in the stirring and crushing process, fully stirring and outputting the construction soil material;
the curing agent in the embodiment comprises cement and mineral powder, wherein the mass ratio of the cement in the construction soil material is 2.5-3.5%, and the mass ratio of the mineral powder in the construction soil material is 0.5-1.5%. In the embodiment, the mass ratio of cement in the curing agent in the construction soil material is 3%, and the mass ratio of mineral powder in the curing agent in the construction soil material is 1%;
after the cement is mixed into the mixed soil material, the cement can generate hydrolysis and hydration reaction under the participation of water to generate water and hydrate, the cement hydrate can generate a series of physical and chemical reactions with clay particles, and the cementing action of the cement can form a cement stone framework which has the characteristics of good integrity, high water stability, high strength and the like, so that the strength and the stability of the construction soil material are improved, the original property of soft soil is changed, and the engineering property of the soft soil is improved; the cement is used as the cementing material to realize the integral hardening effect of the construction soil after the construction soil is rolled and formed, thereby achieving the purpose of greatly improving the roadbed compactness, the CBR value and the water stability and further meeting the requirements on the filler in the urban road roadbed design Specification (CJJ 194-2013);
the method is characterized in that strong chemical and physical actions are generated between quicklime in the construction soil material and soil, so that the physical and mechanical properties of the construction soil material are fundamentally improved, the initial period of the quicklime in the construction soil material is shown in that the quicklime can perform ion exchange action with clay in the construction soil material, so that the thickness of a clay water film layer is reduced, the plasticity of the construction soil material is reduced, the later period of the quicklime in the construction soil material is shown in the formation of a crystal structure, and the strength, the plate body property and the stability of the construction soil material are improved;
the mineral powder is doped, so that the solidification cost of the construction soil material can be reduced, and the composite improvement effect with cement and quicklime can be achieved; the mineral powder in the embodiment can be made of fly ash, the fly ash is added to ensure that the fly ash and the molecules of the solidified substance are physically adsorbed on a phase interface layer, and the adsorption between the fly ash and the solidified substance not only has the secondary valence force of intermolecular interaction, but also has the main valence force of the interaction between atoms, namely the combined action of physical action and chemical action;
the construction soil material prepared by mixing the three curing agents can be used for curing the abandoned soil and realizing resource utilization of the abandoned soil as a substitute scheme for the conventional slag roadbed filler; meanwhile, the curing agent formed by combining three inorganic materials in proportion does not pollute the underground soil and the surrounding underground water environment; the prepared solidified soil mixture is used as roadbed filling, and has small attenuation of mechanical property of a soil body and good water stability under the action of long-term water environment;
and S4, conveying the construction soil to a construction site for paving and rolling, and finishing the paving and rolling within 6 hours after the construction soil is output in order to ensure a good construction effect.
The paving and rolling method of the construction soil material comprises the following steps: clearing the surface of the upper surface of the area to be paved, wherein the surface is cleared by 30cm in the embodiment; and circularly spreading and rolling the multi-layer construction soil to form the roadbed.
The process of paving and rolling the construction soil material comprises the following steps:
1) when filling, the two sides of the roadbed are respectively filled with 50cm of super-wide filling, so that the compactness of the side slope part can meet the requirement.
2) The construction soil is transported by using a self-dumping truck, before the self-dumping truck discharges the construction soil in the area to be constructed on the roadbed, the area which can be paved by each truck is calculated according to the preset loose paving thickness and the capacity of the self-dumping truck, soil discharging grids are manually sprayed out of the area to be constructed on the roadbed, and a fixed amount of construction soil is discharged in each soil discharging grid.
In this embodiment, the construction soil is spread and rolled in four layers.
Considering that the original soil roadbed is uneven in elevation, the first layer needs to be leveled, so that the paving thickness of the first layer can be properly thickened, and the paving thickness of the first layer can reach 5 cm; the paving thickness of the second layer is 20-25cm, a grader is used for leveling to ensure the flatness, and after the roadbed is compacted, the road arch meets the design requirement to ensure good drainage.
3) Before rolling the construction soil, measuring the water content of the construction soil, and if the water content of the construction soil is higher than a set water content threshold value, digging and airing the construction soil by using a rotary cultivator until the water content of the construction soil reaches the set water content threshold value; and if the water content of the construction soil material is lower than the set water content threshold value, the construction soil material is dug by using a rotary cultivator, and water is sprayed on the construction soil material by using a water spraying vehicle until the water content of the construction soil material reaches the set water content threshold value, wherein the water content threshold value can be the best water content determined. Finally, the water content of the construction soil material can fluctuate by +/-2% relative to the set water content threshold.
4) When the first layer and the second layer of construction soil materials are rolled, a 220-type crawler excavator is used for static pressing for 4-5 times, the advancing speed of the crawler excavator is 1.5-1.7km/h, then a 14-ton double-smooth-wheel roller is used for static pressing for 4-5 times, and the advancing speed of the double-smooth-wheel roller is 2.0-2.5 km/h.
When the construction soil material of the third layer and the upper layers is rolled, a road roller of 20 tons is adopted for static pressure for 2 times, and the advancing speed is 1.5-1.7 km/h; then, rolling for 2 times by using a road roller of 20 tons with weak vibration, wherein the running speed is 2.0-2.5 km/h; then rolling for 2 times by strong vibration of a road roller of 20 tons, wherein the running speed is 2.0-2.5 km/h; and finally, rolling for 3 times by using a 21-ton three-smooth-wheel roller, wherein the running speed is 2.5-3 km/h.
The rolling process adopts a driving and reversing staggered pitch method. Namely, when rolling, the rear wheels are overlapped 1/2 wheel widths, and the rolling is carried out until the compactness required by the design is reached; strictly forbidding the road roller to turn around and brake suddenly on a finished or rolling road section; the pressure on two sides of the roadbed should be increased for 2-3 times.
Through the construction process, a roadbed is further formed, and the foundation bearing capacity of the roadbed can reach over 200 kPa.
After the roadbed is rolled, the geotextile is covered above the roadbed in time for watering maintenance, so that the geotextile is ensured to be continuously moist, open water cannot be accumulated above the roadbed, and the maintenance time is not less than 7 days.
According to the roadbed construction method for solidifying earthwork, the abandoned earthwork nearby roadbed construction can be selected, drying and solidification treatment of the abandoned earthwork can be carried out on the output place of the abandoned earthwork, and then the treated abandoned earthwork is used for paving and rolling the roadbed.
In addition, when the drying and curing treatment of the abandoned earthwork is carried out, the adopted drying agent and curing agent are inorganic materials, so that the pollution to the surrounding underground water and soil environment can be avoided. In addition, the earthwork is abandoned to be solidified when being spread and rolled, and compared with the conventional earthwork solidification technology that solidification materials are added at one time, the earthwork solidification method carries out solidification twice, so that the compaction degree and the CBR value of the output construction earthwork after being rolled and formed are higher, and the water stability is better.
Example two
The present embodiment is different from the first embodiment only in that: in the embodiment, the waste soil is slurry, and in S1, after a drying agent is added into the waste soil, the slurry is dried by a slurry drying device, so that a slurry cake with the water content of 35-40% is obtained and is used as a mixed soil material;
the adopted drying agent is quicklime, the mass ratio of the quicklime as the drying agent in the mixed soil material is 1.5-2.5%, and in the embodiment, the mass ratio of the quicklime as the drying agent in the mixed soil material is 2%;
in S2, in this embodiment, the water content of the mud cake is further reduced to below 30% by stacking the mud cake in a fixed area.
In S3, the curing agent in the embodiment comprises cement, quicklime and mineral powder, wherein the mass ratio of the cement in the construction soil material is 2.5-3.5%, the mass ratio of the quicklime in the construction soil material in the curing agent is 2.5-3.5%, and the mass ratio of the mineral powder in the construction soil material is 0.5-1.5%; specifically, in the curing agent in the embodiment, the mass ratio of cement in the construction soil material is 3%, the mass ratio of quicklime in the curing agent in the construction soil material is 3%, and the mass ratio of mineral powder in the curing agent in the construction soil material is 1%.
Claims (10)
1. An earth solidification roadbed construction method is characterized in that: the method comprises the following steps:
s1, adding a drying agent into the abandoned soil for drying to form a mixed soil material;
s2, stacking and stewing the mixed soil in a fixed area;
s3, on the day of paving construction, stirring and crushing the mixed soil material after the material stewing process, adding a curing agent in the stirring and crushing process, fully stirring and outputting the construction soil material;
and S4, conveying the construction soil to a construction site for paving and rolling.
2. The earth-curing roadbed construction method according to claim 1, wherein: in S1, if the waste soil is slurry, adding a drying agent into the waste soil, and drying the slurry by a slurry drying device to obtain a slurry cake with the water content of 35-40% as a mixed soil material;
correspondingly, in S2, the mud cake is piled up and braised in a fixed area, so that the water content of the mud cake is further reduced to below 30%.
3. The earth-curing roadbed construction method according to claim 2, wherein: the drying agent is quicklime, and the mass ratio of the quicklime as the drying agent in the mixed soil material is 1.5-2.5%;
the curing agent comprises cement, quicklime and mineral powder, wherein the mass ratio of the cement in the construction soil material is 2.5-3.5%, the mass ratio of the quicklime in the construction soil material in the curing agent is 2.5-3.5%, and the mass ratio of the mineral powder in the construction soil material is 0.5-1.5%.
4. The earth-curing roadbed construction method according to claim 3, wherein: the mass ratio of the quicklime serving as a drying agent in the mixed soil material is 2 percent; the mass ratio of cement in the curing agent in the construction soil material is 3%, the mass ratio of quicklime in the curing agent in the construction soil material is 3%, and the mass ratio of mineral powder in the curing agent in the construction soil material is 1%.
5. The earth-curing roadbed construction method according to claim 1, wherein: in S1, if the waste soil is clay, adding a drying agent into the waste soil, and stirring and crushing the waste soil by using a crusher, thereby outputting a mixed soil material;
correspondingly, in S2, the mixed soil is piled and braised, so that the water content of the mixed soil is further reduced to below 30%.
6. The earth-curing roadbed construction method according to claim 5, wherein: the drying agent is quicklime, and the mass ratio of the quicklime as the drying agent in the mixed soil material is 4.5-5.5%;
the curing agent comprises cement and mineral powder, wherein the mass ratio of the cement in the construction soil material is 2.5-3.5%, and the mass ratio of the mineral powder in the construction soil material is 0.5-1.5%.
7. The earth-curing roadbed construction method according to claim 6, wherein: the mass proportion of the quicklime serving as a drying agent in the mixed soil material is 5 percent; the mass ratio of cement in the curing agent in the construction soil material is 3%, and the mass ratio of mineral powder in the curing agent in the construction soil material is 1%.
8. The earth-curing roadbed construction method according to any one of claims 1 to 7, wherein: the paving and rolling method of the construction soil material comprises the following steps: clearing the upper surface of the area to be paved; and circularly spreading and rolling the multi-layer construction soil to form the roadbed.
9. The earth-curing roadbed construction method according to claim 8, wherein: before rolling the construction soil, measuring the water content of the construction soil, and if the water content of the construction soil is higher than a set water content threshold value, digging and airing the construction soil by using a rotary cultivator until the water content of the construction soil reaches the set water content threshold value; and if the water content of the construction soil material is lower than the set water content threshold value, the construction soil material is dug by using a rotary cultivator, and water is sprayed on the construction soil material by using a water spraying vehicle until the water content of the construction soil material reaches the set water content threshold value.
10. The earth-curing roadbed construction method according to any one of claims 1 to 7, wherein: and finishing the paving and rolling within 6 hours after the construction soil is output.
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| CN117326842A (en) * | 2023-09-18 | 2024-01-02 | 中国海洋大学 | Solidified contaminated soil and method for filling roadbed by using solidified contaminated soil |
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| CN117326842B (en) * | 2023-09-18 | 2024-05-03 | 中国海洋大学 | Solidified contaminated soil and method for filling roadbed by using solidified contaminated soil |
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