CN113818425A - Improvement method and construction method of expansive soil - Google Patents
Improvement method and construction method of expansive soil Download PDFInfo
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- CN113818425A CN113818425A CN202111119056.5A CN202111119056A CN113818425A CN 113818425 A CN113818425 A CN 113818425A CN 202111119056 A CN202111119056 A CN 202111119056A CN 113818425 A CN113818425 A CN 113818425A
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- 239000002689 soil Substances 0.000 title claims abstract description 171
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010276 construction Methods 0.000 title abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 36
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 36
- 239000004571 lime Substances 0.000 claims abstract description 36
- 239000003607 modifier Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000005056 compaction Methods 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 229920002748 Basalt fiber Polymers 0.000 claims description 50
- 238000005096 rolling process Methods 0.000 claims description 36
- 239000002893 slag Substances 0.000 claims description 36
- 239000004743 Polypropylene Substances 0.000 claims description 22
- 239000000835 fiber Substances 0.000 claims description 22
- -1 polypropylene Polymers 0.000 claims description 22
- 229920001155 polypropylene Polymers 0.000 claims description 22
- 239000002699 waste material Substances 0.000 claims description 20
- 239000011521 glass Substances 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010881 fly ash Substances 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 230000003068 static effect Effects 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 10
- 239000004568 cement Substances 0.000 description 7
- 239000011083 cement mortar Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000008961 swelling Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/001—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing unburned clay
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Paleontology (AREA)
- Ceramic Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to an improvement method and a construction method of expansive soil, wherein the improvement method of the expansive soil is to improve the expansive soil by using a modifier, the modifier comprises lime, the addition amount of the lime is 3-10% of the mass of the expansive soil, and the percentages are mass percentages. The concrete improvement steps are as follows: (1) uniformly mixing the modifying agent and the expansive soil to obtain mixed expansive soil; (2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in road soil engineering test regulation JTG E40-2007; (3) and (3) adding water into the mixed expansive soil obtained in the step (1) according to the determined water content with the optimal water content, uniformly stirring, and sealing the materials under natural conditions to obtain the improved expansive soil. According to the invention, the lime is added into the expansive soil, so that the performance of the expansive soil is improved, and the expansion rate of the expansive soil is reduced.
Description
Technical Field
The invention relates to the field of expansive soil, in particular to an improvement method and a construction method of expansive soil.
Background
Expansive soil is also an important regional special soil, and according to the definition in the national construction technical Specification for expansive soil regions (GBJ112-87), the expansive soil is cohesive soil which mainly comprises hydrophilic minerals and has two deformation characteristics of obvious water absorption expansion and water loss shrinkage. As is known, the general cohesive soil also has expansion and contraction characteristics, but the quantity of the cohesive soil is not large, so that the cohesive soil has no great practical significance to engineering; the expansive soil has the characteristics of cyclic deformation of expansion-contraction-re-expansion, and is very obvious and often harmful to engineering.
The expansive soil has a wide distribution range in China, according to the existing data, more than 20 provinces and a large amount of expansive soil are automatically distributed in China, the harm of the expansive soil is potential, long-term and repeated, and the American project boundary is called as 'hidden disaster'.
Therefore, the swelling soil is effectively treated to improve the swelling rate, which is of great significance to engineering construction.
Disclosure of Invention
One of the objects of the present invention is: provides an improvement method of expansive soil.
In order to achieve the above purpose, the invention provides the following technical scheme:
the method for improving the expansive soil comprises the step of improving the expansive soil by using a modifier, wherein the modifier comprises lime, the addition amount of the lime is 3-10% of the mass of the expansive soil, and the percentages are mass percentages.
Preferably, the modifier also comprises fly ash, waste glass slag, steel slag, polypropylene fiber and basalt fiber.
Preferably, the addition amount of the fly ash is 4-7% of the mass of the expansive soil, the addition amount of the waste glass slag is 1-3% of the mass of the expansive soil, the addition amount of the steel slag is 2-5% of the mass of the expansive soil, the addition amount of the polypropylene fiber is 0.05-0.1% of the mass of the expansive soil, and the addition amount of the basalt fiber is 0.05-0.1% of the mass of the expansive soil, wherein the percentages are mass percentages.
Preferably, the length of the basalt fiber is 5-15mm, and the length of the polypropylene fiber is 5-15 mm.
Preferably, the specific improvement steps are as follows:
(1) uniformly mixing the modifying agent and the expansive soil to obtain mixed expansive soil;
(2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in road soil engineering test regulation JTG E40-2007;
(3) and (3) adding water into the mixed expansive soil obtained in the step (1) according to the determined water content with the optimal water content, uniformly stirring, and sealing the materials under natural conditions to obtain the improved expansive soil.
Preferably, the material sealing time in the step (3) is as follows: 2-3 days.
The second purpose of the invention is: a construction method for improving expansive soil is provided.
In order to achieve the above purpose, the invention provides the following technical scheme:
a construction method for improving expansive soil comprises the following steps:
s1: removing surface soil of earthwork in the field area;
s2: the improved expansive soil is transported to a field and evenly paved;
s3: and (5) detecting that the water content of the improved expansive soil reaches the optimal water content, and then carrying out rolling treatment.
Preferably, the rolling process in step S3 is performed in the following manner: and (3) carrying out static pressing for 1 time, then carrying out vibration rolling for 3-5 times, and finally carrying out static pressing for 1 time.
Preferably, the speed of the first vibration rolling is 1.2-1.5km/h, and the speed of the subsequent vibration rolling is 2.2-2.6 km/h.
Preferably, the thickness of the topsoil removed in the step S1 is 50 cm; after the rolling in the step S3, the lime content in the modified expansive soil in the portion with a distance of less than 80cm from the road surface from top to bottom is 8% of the expansive soil, and the lime content in the remaining portion of the modified expansive soil is 5%.
The invention has the beneficial effects that:
according to the invention, the lime is added into the expansive soil, so that the performance of the expansive soil is improved, and the expansion rate of the expansive soil is reduced. By adding industrial byproducts such as coal gangue, fly ash and steel slag, the waste recycling effect is achieved, the price is low, the materials are widely available, and the significance of resource recycling and environmental protection is achieved; not only further improves the expansion rate of the expansive soil, but also improves the strength of the expansive soil. By adding the polypropylene fiber and the basalt fiber, the expansion rate of the expansive soil is further improved, the anti-cracking performance of the expansive soil is also improved, and the anti-cracking performance of the expansive soil and the strength of the expansive soil are synergistically improved together with the coal gangue, the fly ash and the steel slag.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1
The method for improving the expansive soil comprises the steps of improving the expansive soil by using an improver, wherein the improver comprises lime, and the mixing amount of the lime in the improved expansive soil is 3-10% of that of the expansive soil;
the concrete improvement steps are as follows:
(1) uniformly mixing lime and expansive soil to obtain mixed expansive soil;
(2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in road soil engineering test regulation JTG E40-2007;
(3) and (3) adding water into the mixed expansive soil obtained in the step (1) according to the determined water content with the optimal water content, uniformly stirring, and sealing the materials for 2 days under natural conditions to obtain the improved expansive soil.
The construction method of the improved expansive soil comprises the following steps:
s1: removing 50cm of surface soil of earthwork of the field;
s2: the improved expansive soil is transported to a field and evenly paved;
s3: after the water content of the improved expansive soil is detected to reach the optimal water content, rolling treatment is carried out, and the specific rolling treatment mode is as follows: and (3) carrying out static pressure for 1 time, then carrying out vibration rolling for 3-5 times, and finally carrying out static pressure for 1 time, wherein during rolling treatment, the speed of vibration rolling for the first time is 1.2-1.5km/h, and the speed of vibration rolling for the later time is 2.2-2.6 km/h.
The method of example 1 was followed, varying the compaction of the modified bentonite and the amount of lime added, to obtain the swelling parameters shown in table 1 below:
TABLE 1 Effect of degree of compaction and lime addition on expansion parameters
As can be seen from table 1 above: the expansion rate of the expansive soil can be improved by adding lime into the expansive soil, and the more the lime is added, the more the free expansion rate is improved obviously.
Example 2
The method for improving the expansive soil comprises the steps of improving the expansive soil by using a modifier, wherein the modifier comprises lime, fly ash, waste glass slag, steel slag, polypropylene fibers and basalt fibers; the cement-based cement mortar comprises, by mass, 8% of lime, 4% of fly ash, 1% of waste glass slag, 2% of steel slag, 0.05% of polypropylene fiber and 0.05% of basalt fiber, wherein the addition amount of the lime is 8% of the mass of the expansive soil, the addition amount of the waste glass slag is 4% of the mass of the expansive soil, the addition amount of the steel slag is 2% of the mass of the expansive soil, the addition amount of the basalt fiber is 0.05% of the mass of the expansive soil, and the percentages are mass percentages, wherein the length of the basalt fiber is 5-15mm, and the length of the polypropylene fiber is 5-15 mm.
The concrete improvement steps are as follows:
(1) uniformly mixing the modifying agent and the expansive soil to obtain mixed expansive soil;
(2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in road soil engineering test regulation JTG E40-2007;
(3) and (3) adding water into the mixed expansive soil obtained in the step (1) according to the determined water content with the optimal water content, uniformly stirring, and sealing the materials for 2 days under natural conditions to obtain the improved expansive soil.
The construction method of the improved expansive soil comprises the following steps:
s1: removing 50cm of surface soil of earthwork of the field;
s2: the improved expansive soil is transported to a field and evenly paved;
s3: after the water content of the improved expansive soil is detected to reach the optimal water content, rolling treatment is carried out, and the specific rolling treatment mode is as follows: and (3) carrying out static pressing for 1 time, then carrying out vibration rolling for 4 times, and finally carrying out static pressing for 1 time, wherein during rolling, the speed of vibration rolling for the first time is 1.2km/h, and then the speed of vibration rolling is 2.2 km/h.
Example 3
The method for improving the expansive soil comprises the steps of improving the expansive soil by using a modifier, wherein the modifier comprises lime, fly ash, waste glass slag, steel slag, polypropylene fibers and basalt fibers; the cement-based cement mortar comprises, by mass, 8% of lime, 5% of fly ash, 2% of waste glass slag, 3% of steel slag, 0.08% of polypropylene fiber and 0.08% of basalt fiber, wherein the cement-based cement mortar is prepared from the following raw materials, the cement-based cement mortar is prepared from waste glass slag, the basalt fiber and the polypropylene fiber, the cement-based cement mortar is prepared from waste glass slag, the basalt fiber and the polypropylene fiber, the basalt fiber is prepared from waste glass slag, the basalt fiber and the basalt fiber, and the polypropylene fiber, and the basalt fiber are mixed, wherein the lime is added in percentages by mass of 8% of expansive soil, the fly ash is 5% of expansive soil, the waste glass slag is added by mass of expansive soil, the basalt fiber is 0.08% of expansive soil by mass, and the basalt fiber is prepared from basalt fiber by mass of expansive soil, and the mass of basalt fiber, the mass of basalt fiber is in percentages of mass of the basalt fiber, wherein the basalt fiber, the mass of the basalt fiber, and the mass of the basalt fiber, wherein the basalt fiber, the mass of the basalt fiber, the mass of the basalt fiber, and the mass of the basalt fiber, and the length of the basalt fiber, wherein the length of the basalt fiber, and the length of the basalt fiber, wherein the length of the basalt fiber, and the length of the basalt fiber, wherein the length of the basalt fiber, and the length of the basalt fiber, of the length of the basalt fiber, of the length of the mass of the basalt fiber, of the length of the mass of the length of the basalt fiber, of the length of the.
The concrete improvement steps are as follows:
(1) uniformly mixing the modifying agent and the expansive soil to obtain mixed expansive soil;
(2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in road soil engineering test regulation JTG E40-2007;
(3) and (3) adding water into the mixed expansive soil obtained in the step (1) according to the determined water content with the optimal water content, uniformly stirring, and sealing the materials for 2 days under natural conditions to obtain the improved expansive soil.
The construction method of the improved expansive soil comprises the following steps:
s1: removing 50cm of surface soil of earthwork of the field;
s2: the improved expansive soil is transported to a field and evenly paved;
s3: after the water content of the improved expansive soil is detected to reach the optimal water content, rolling treatment is carried out, and the specific rolling treatment mode is as follows: and (3) carrying out static pressing for 1 time, then carrying out vibration rolling for 4 times, and finally carrying out static pressing for 1 time, wherein during rolling, the speed of vibration rolling for the first time is 1.3km/h, and then the speed of vibration rolling is 2.4 km/h.
Example 4
The method for improving the expansive soil comprises the steps of improving the expansive soil by using a modifier, wherein the modifier comprises lime, fly ash, waste glass slag, steel slag, polypropylene fibers and basalt fibers; the cement-based cement mortar comprises, by mass, 8% of lime, 7% of fly ash, 3% of waste glass slag, 5% of steel slag, 0.1% of polypropylene fiber and 0.1% of basalt fiber, wherein the addition amount of the lime is 8% of the mass of the expansive soil, the addition amount of the fly ash is 7% of the mass of the expansive soil, the addition amount of the waste glass slag is 3% of the mass of the expansive soil, the addition amount of the steel slag is 5% of the mass of the expansive soil, the addition amount of the basalt fiber is 0.1% of the mass of the expansive soil, and the percentages are mass percentages, wherein the length of the basalt fiber is 5-15mm, and the length of the polypropylene fiber is 5-15 mm.
The concrete improvement steps are as follows:
(1) uniformly mixing the modifying agent and the expansive soil to obtain mixed expansive soil;
(2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in road soil engineering test regulation JTG E40-2007;
(3) and (3) adding water into the mixed expansive soil obtained in the step (1) according to the determined water content with the optimal water content, uniformly stirring, and sealing the materials for 3 days under natural conditions to obtain the improved expansive soil.
The construction method of the improved expansive soil comprises the following steps:
s1: removing 50cm of surface soil of earthwork of the field;
s2: the improved expansive soil is transported to a field and evenly paved;
s3: after the water content of the improved expansive soil is detected to reach the optimal water content, rolling treatment is carried out, and the specific rolling treatment mode is as follows: and (3) carrying out static pressing for 1 time, then carrying out vibration rolling for 5 times, and finally carrying out static pressing for 1 time, wherein during rolling, the speed of vibration rolling for the first time is 1.5km/h, and then the speed of vibration rolling is 2.6 km/h.
Comparative example 1
On the basis of the example 3, the components of the modifying agent are changed, and the other contents are kept unchanged; the specific changes are as follows:
the modifier comprises lime, fly ash, waste glass slag and steel slag; the lime is 8% of the mass of the expansive soil, the fly ash is 5% of the mass of the expansive soil, the waste glass slag is 2% of the mass of the expansive soil, and the steel slag is 3% of the mass of the expansive soil, wherein the percentages are mass percentages.
Comparative example 2
On the basis of the example 3, the components of the modifying agent are changed, and the other contents are kept unchanged; the specific changes are as follows:
the modifier comprises lime, polypropylene fiber and basalt fiber; the cement expansive soil is characterized in that the addition amount of lime is 8% of the mass of the expansive soil, the addition amount of polypropylene fibers is 0.08% of the mass of the expansive soil, the addition amount of basalt fibers is 0.08% of the mass of the expansive soil, and the percentages are mass percentages, wherein the length of the basalt fibers is 5-15mm, and the length of the polypropylene fibers is 5-15 mm.
The modified expansive soils obtained in the examples and comparative examples were tested for the free expansion rate and unconfined compressive strength as shown in the following table 2:
TABLE 2 Effect of different modifiers on the Properties of expansive soils
| Item | Free swelling Rate (%) | Unconfined compressive strength (kPa) |
| Non-improved expansive soil | 48.2 | 265.50 |
| Example 3 | 23.2 | 538.15 |
| Comparative example 1 | 25.8 | 490.55 |
| Comparative example 2 | 26.6 | 475.62 |
As can be seen from table 2 above: the fly ash, the waste glass slag, the steel slag, the polypropylene fiber and the basalt fiber are added, so that the free expansion rate of the expansive soil is improved, the unconfined compressive strength performance is improved, and meanwhile, the raw materials have a synergistic effect, and especially the unconfined compressive strength performance is synergistically improved.
In addition, it should be particularly noted that, in the actual construction process, after rolling, the doping amount of lime in the modified expansive soil at the part with the distance of less than 80cm from the road surface from top to bottom is greater than that of lime in the other part of the modified expansive soil; specifically, the lime content in the portion of the modified expansive soil with a distance of less than 80cm from the road surface can be selected to be 8% of that of the expansive soil, and the lime content in the remaining portion of the modified expansive soil can be selected to be 5%. The treatment not only meets the requirements, but also saves materials, and is economical and environment-friendly.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for improving the expansive soil is characterized in that the expansive soil is improved by using a modifier, wherein the modifier comprises lime, the addition amount of the lime is 3-10% of the mass of the expansive soil, and the percentages are mass percentages.
2. The method for improving expansive soil according to claim 1, wherein: the modifier also comprises fly ash, waste glass slag, steel slag, polypropylene fiber and basalt fiber.
3. The method for improving expansive soil according to claim 2, wherein: the addition amount of the fly ash is 4-7% of the mass of the expansive soil, the addition amount of the waste glass slag is 1-3% of the mass of the expansive soil, the addition amount of the steel slag is 2-5% of the mass of the expansive soil, the addition amount of the polypropylene fiber is 0.05-0.1% of the mass of the expansive soil, and the addition amount of the basalt fiber is 0.05-0.1% of the mass of the expansive soil, wherein the percentages are mass percentages.
4. The method for improving expansive soil according to claim 3, wherein: the length of the basalt fiber is 5-15mm, and the length of the polypropylene fiber is 5-15 mm.
5. The method for improving expansive soil according to claim 2, wherein: the concrete improvement steps are as follows:
(1) uniformly mixing the modifying agent and the expansive soil to obtain mixed expansive soil;
(2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in road soil engineering test regulation JTG E40-2007;
(3) and (3) adding water into the mixed expansive soil obtained in the step (1) according to the determined water content with the optimal water content, uniformly stirring, and sealing the materials under natural conditions to obtain the improved expansive soil.
6. The method for improving expansive soil according to claim 5, wherein: the material sealing time in the step (3) is as follows: 2-3 days.
7. A method of constructing an improved expansive soil as claimed in any one of claims 1 to 6, comprising the steps of:
s1: removing surface soil of earthwork in the field area;
s2: the improved expansive soil is transported to a field and evenly paved;
s3: and (5) detecting that the water content of the improved expansive soil reaches the optimal water content, and then carrying out rolling treatment.
8. The method of claim 7, wherein the rolling process in step S3 is performed by: and (3) carrying out static pressing for 1 time, then carrying out vibration rolling for 3-5 times, and finally carrying out static pressing for 1 time.
9. The method as claimed in claim 8, wherein the vibration rolling is performed at a speed of 1.2-1.5km/h for the first time and at a speed of 2.2-2.6km/h for the subsequent time.
10. The method of claim 8, wherein the thickness of the topsoil removed in step S1 is 50 cm; after the rolling in the step S3, the lime content in the modified expansive soil in the portion with a distance of less than 80cm from the road surface from top to bottom is 8% of the expansive soil, and the lime content in the remaining portion of the modified expansive soil is 5%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114933465A (en) * | 2022-04-29 | 2022-08-23 | 东南大学 | Preparation method of foundation filler by using silt and lime combined improved expansive soil |
| CN115521094A (en) * | 2022-08-30 | 2022-12-27 | 中铁十一局集团有限公司 | Preparation method and construction process of improved expansive soil |
| CN116462453A (en) * | 2023-04-14 | 2023-07-21 | 湖北工业大学 | Improved expansive soil and preparation method and application thereof |
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| CN114933465A (en) * | 2022-04-29 | 2022-08-23 | 东南大学 | Preparation method of foundation filler by using silt and lime combined improved expansive soil |
| CN114933465B (en) * | 2022-04-29 | 2022-11-18 | 东南大学 | Preparation method of foundation filler by using silt and lime combined improved expansive soil |
| CN115521094A (en) * | 2022-08-30 | 2022-12-27 | 中铁十一局集团有限公司 | Preparation method and construction process of improved expansive soil |
| CN116462453A (en) * | 2023-04-14 | 2023-07-21 | 湖北工业大学 | Improved expansive soil and preparation method and application thereof |
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