CN110965438A - Construction method of high-liquid-limit low-CBR soil roadbed - Google Patents
Construction method of high-liquid-limit low-CBR soil roadbed Download PDFInfo
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- CN110965438A CN110965438A CN201911286029.XA CN201911286029A CN110965438A CN 110965438 A CN110965438 A CN 110965438A CN 201911286029 A CN201911286029 A CN 201911286029A CN 110965438 A CN110965438 A CN 110965438A
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- soil
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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
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
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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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
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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
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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
- E01C3/04—Foundations produced by soil stabilisation
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a high liquid limit and low CBR soil roadbed construction method, which comprises the steps of firstly adding HAS soil curing agent into high liquid limit and low CBR soil with the water content of 20% +/-2% for improvement, obviously improving the CBR value of the high liquid limit and low CBR soil, enabling the roadbed compactness and deflection value of the improved soil to meet the construction requirement, and then carrying out roadbed construction. By improving the high liquid limit and low CBR soil, the invention solves the problems of high soil taking and abandoning cost, long construction period, slow filler strength increase, poor water stability, large drying shrinkage, easy cracking, environmental protection, energy consumption, atmospheric pollution and the like in urban road construction. The invention takes the slag as the main raw material of the HAS soil stabilizer, can change waste into valuable, saves energy to the maximum extent and reduces environmental pollution.
Description
Technical Field
The invention relates to the field of urban road engineering construction, in particular to a high-liquid-limit low-CBR soil roadbed construction method.
Background
High liquid limit soil is soil with liquid limit greater than 50% and plasticity index greater than 26. Because the high liquid limit low CBR soil has high water content, light volume weight, poor stability and low strength, the compactness and the strength of the conventional construction process cannot meet the design specification requirements, and a large amount of high liquid limit low CBR soil is treated as waste soil due to poor improvement effect. Because the urban road construction has short soil source, large construction period pressure, serious soil and air pollution caused by soil taking and abandoning and large energy consumption in transportation, the high liquid limit and low CBR soil is necessary to be improved and then used as roadbed filling. The existing improvement technology mainly adopts the doped lime powder and cement for improvement, and has the adverse phenomena of difficult roadbed compaction, over-standard deflection value, spring occurrence and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the construction method of the high-liquid limit low-CBR soil roadbed with high compaction degree and low deflection value.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a construction method of a high liquid limit and low CBR soil roadbed comprises the following steps:
(1) removing impurities in undisturbed soil; tedding undisturbed soil with the water content higher than 22%;
(2) when the water content of the soil is reduced to 18-22%, uniformly spreading HAS soil curing agent which is 5-6% of the weight of the soil on the surface of the soil, and uniformly mixing;
(3) after mixing, immediately spreading according to the loose spreading thickness of each layer of soil being 30cm, leveling for the second time to ensure that the flatness meets the requirement, and then rolling;
(4) and (3) after rolling and forming, covering the road surface or spraying water, maintaining the water content of the soil in an optimal water content state, and maintaining for 2-3 days.
On the basis of the technical scheme, in the step (1), the soil is filled by high liquid limit and low CBR soil in an adjacent area, preferably by high liquid limit and low CBR soil with close soil property and close water content in the adjacent area.
On the basis of the technical scheme, in the step (1), the particle size of the impurities is larger than 6.5 cm.
On the basis of the technical scheme, in the step (3), when paving, the manual bulldozer is matched for synchronously paving, and the layer surface is a transverse drainage slope inclined by 2% -4% towards two sides when paving.
On the basis of the technical scheme, in the step (3), the rolling compaction method specifically comprises the following steps: and sequentially carrying out 1-time static pressing, 1-time low frequency, 1-time high frequency, 1-time low frequency and finally 1-time static pressing to eliminate the wheel tracks.
On the basis of the technical scheme, in the step (3), rolling is carried out from two sides to the middle in a longitudinal advancing and retreating mode, and rolling is carried out in a staggered mode.
On the basis of the technical scheme, in the step (3), rolling is simultaneously carried out by 2 rollers of 10t-15 t.
On the basis of the technical scheme, in the step (3), the compaction degree of the rolled soil is more than or equal to 93 percent.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention improves the high liquid limit and low CBR soil into qualified filler meeting the standard requirements, saves the cost of taking and abandoning soil and directly reduces the construction cost;
(2) the invention improves the high liquid limit and low CBR soil into qualified filler meeting the standard requirements, effectively utilizes the existing spoil resources and reduces the loss of national land resources;
(3) the invention improves the high liquid limit and low CBR soil into qualified filler meeting the standard requirements, reduces the pollution of dust, noise and the like generated by soil taking and abandoning, reduces carbon emission, and is beneficial to energy-saving, environment-friendly and green construction;
(4) the improved soil is not required to be subjected to material sealing, namely, the soil is mixed and pressed, the construction period is short, the construction progress can be accelerated, and the construction period is saved;
(5) the improved soil has the advantages of quick increase of early strength and good water stability;
(6) the HAS soil stabilizer adopted by the invention HAS micro-expansion performance, and can overcome the problems of large drying shrinkage and easy cracking of conventional improving materials such as cement, lime and the like.
Detailed Description
The technical solutions of the present invention are further described below with reference to specific embodiments so that those skilled in the art can implement the technical solutions by referring to the description text.
HAS soil firming agents used in the following examples were purchased from Kudzuvine dam, firm technologies, Inc.
Example 1
Sampling high liquid limit and low CBR soil on site, blending HAS soil curing agents with different proportions to improve the high liquid limit and low CBR soil, detecting the maximum dry density, the optimal water content, the expansion amount and the CBR index of the improved soil, comparing and analyzing the test data of the improved soil, and finally determining the weight mixing ratio as dry soil by combining the construction characteristics of a site road mixing method, the site actual measurement data of a test section and the economic ratio selection on the premise of meeting the standard requirement: HAS soil firming agent is 100: 6.
Table 1: HAS soil stabilizer mix proportion test detection result summary table
The field road mixing method increases the HAS soil curing agent mixing amount by 1% according to JTG/T F20-2015 detailed construction technology of highway pavement base, determines the actual mixing amount of the field HAS soil curing agent to be 6 wt%, and constructs a test section, wherein the construction of the test section is qualified.
Table 2: HAS soil stabilizer test section construction performance data summary table
Example 2
(1) Screening the soil with high liquid limit and low CBR to be improved
High liquid limit and low CBR soil in an adjacent area is selected for filling, and because the undisturbed soil contains a large amount of concrete blocks, bricks, broken stones and other construction wastes, the undisturbed soil is screened to obtain the soil to be improved. And (3) primarily sorting by using an excavator during screening, screening and removing the stones and bricks with the particle size larger than 6.5cm, and performing manual assistance.
(2) Tedding and testing water content
And immediately detecting the water content of the soil to be improved by a tester after screening. Because the water content of the undisturbed soil is generally larger, when the water content exceeds 22%, the undisturbed soil is turned over and sunned, and the change of the water content is tracked in time. When the water content is reduced to 18-22%, HAS soil curing agent can be mixed. And covering the soil with the moisture content meeting the requirement after being tedded to prevent rainwater from wetting.
(3) Determining the dosage of HAS soil stabilizer
Paving the soil to be improved, measuring the thickness of the soil to be improved after determining the paving area of each layer of soil to be improved, calculating the filling earthwork amount of the soil to be improved, and accurately calculating the dosage of the HAS soil stabilizer to be added to the soil to be improved according to the HAS soil stabilizer doping amount of 6 wt% of the soil to be improved.
(4) Adding HAS soil stabilizer and mixing
And uniformly spreading the calculated HAS soil stabilizer on the surface of the soil to be improved, and mixing the HAS soil stabilizer and the soil to be improved for 3 times by adopting an excavator to uniformly mix the soil HAS soil stabilizer and the soil to be improved. The mixing uniformity is ensured in the mixing process, the color is consistent, and the mixing leakage part or the HAS soil stabilizer concentration part is avoided. In the mixing process, the large-aggregate soil blocks are broken.
(5) Spreading and leveling
Spreading is carried out immediately after mixing is finished to prevent moisture evaporation or rainfall influence. When paving, manually matching with a bulldozer, and paving the soil with the improved loose paving thickness of 30 cm. When paving, the layer surface is a transverse drainage slope which inclines 2% -4% to two sides, so as to facilitate drainage of a roadbed.
Paving, and after the loose thickness of paving satisfied the requirement, the manual cooperation bull-dozer carries out the flattening, and the order of flattening is from the centre to both sides, and the local pit is handled and the domestic waste is picked up in the manual cooperation.
(7) Detecting before rolling and rolling
Elevation: before rolling, the elevation control points are discharged by a GPS to measure the elevation of the soil, and the loose paving thickness of the improved soil is calculated.
Flatness: and (3) carrying out secondary leveling by using a bulldozer to ensure that the flatness meets the requirement, and ensuring that the flatness of the improved soil after compaction meets the design requirement.
After the soil is paved and leveled, rolling is started when the loose paving thickness, the flatness and the water content of the improved soil meet the requirements. 2, rolling by using 20T vibratory rollers, wherein the method comprises the following steps: and eliminating the wheel tracks on the static pressure collecting surface for 1 time, 1 time of low frequency, 1 time of high frequency, 1 time of low frequency and 1 time of static pressure collection surface finally. The principle of rolling is as follows: slow first and fast second, from weak vibration to strong vibration, static pressure first and then vibration pressure, two sides first and then middle, and the rolling and longitudinal advance and retreat are carried out in a staggered mode.
(8) Health preserving shaping
And after the roadbed is rolled and formed, maintaining the improved soil at the optimal water content state for curing. And (4) forbidding various vehicles to pass and park before the improved soil does not meet the strength requirement. And before other structural layers are paved on the improved soil roadbed which is qualified in acceptance, a proper amount of water is sprayed on the surface of the improved soil roadbed to facilitate combination.
And during the curing period, a film covering measure is adopted on the road surface, and the curing period is 2-3 days.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (9)
1. A construction method of a high liquid limit and low CBR soil roadbed is characterized by comprising the following steps:
(1) removing impurities in undisturbed soil; tedding undisturbed soil with the water content higher than 22%;
(2) when the water content of the soil is reduced to 18-22%, uniformly spreading HAS soil curing agent which is 5-6% of the weight of the soil on the surface of the soil, and uniformly mixing;
(3) after mixing, immediately paving each layer of soil according to the loose paving thickness of 30cm, leveling for the second time to ensure that the flatness meets the requirement, and then rolling;
(4) and (3) after rolling and forming, covering the road surface or spraying water, maintaining the water content of the soil in an optimal water content state, and maintaining for 2-3 days.
2. The high liquid limit and low CBR dirt subgrade construction method of claim 1, characterized in that: in the step (1), the undisturbed soil is formed by filling high liquid limit and low CBR soil in an adjacent area.
3. The high liquid limit and low CBR dirt subgrade construction method of claim 2, characterized in that: in the step (1), the undisturbed soil is formed by filling high liquid limit low CBR soil with close soil property and close water content in the adjacent area.
4. The high liquid limit and low CBR dirt subgrade construction method of claim 1, characterized in that: in the step (1), the particle size of the impurities is larger than 6.5 cm.
5. The high liquid limit and low CBR dirt subgrade construction method of claim 1, characterized in that: in the step (3), when paving, the manual bulldozer is matched for synchronous paving, and the layer surface is a transverse drainage slope inclined by 2% -4% towards two sides when paving.
6. The high liquid limit and low CBR dirt subgrade construction method of claim 1, characterized in that: in the step (3), the rolling compaction method comprises the following specific steps: and sequentially carrying out 1-time static pressing, 1-time low frequency, 1-time high frequency, 1-time low frequency and finally 1-time static pressing to eliminate the wheel tracks.
7. The high liquid limit and low CBR dirt subgrade construction method of claim 1, characterized in that: in the step (3), rolling is carried out from two sides to the middle in a longitudinal advancing and retreating mode, and rolling is carried out in a staggered mode.
8. The high liquid limit and low CBR dirt subgrade construction method of claim 1, characterized in that: in the step (3), rolling is carried out by 2 road rollers 10t-15t at the same time.
9. The high liquid limit and low CBR dirt subgrade construction method of claim 1, characterized in that: in the step (3), the compaction degree of the rolled soil is more than or equal to 93 percent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911286029.XA CN110965438A (en) | 2019-12-13 | 2019-12-13 | Construction method of high-liquid-limit low-CBR soil roadbed |
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| CN201911286029.XA CN110965438A (en) | 2019-12-13 | 2019-12-13 | Construction method of high-liquid-limit low-CBR soil roadbed |
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| CN110965438A true CN110965438A (en) | 2020-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114045714A (en) * | 2021-11-09 | 2022-02-15 | 成都城投建筑科技投资管理集团有限公司 | Construction process suitable for improving weathered soft rock roadbed filler as roadbed reinforcing layer |
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| CN101428909A (en) * | 2008-12-18 | 2009-05-13 | 武汉大学 | Composite artificial ecological floating island and construction method thereof |
| MX2012001594A (en) * | 2009-08-05 | 2012-06-27 | Proes S A | Flexible paving structure for streets and roads, comprised of a stabilized inferior base and an upper laying pavement of reduced thickness. |
| CN109437801A (en) * | 2018-12-14 | 2019-03-08 | 山东大学 | A kind of high liquid limit clay road modifying agent |
| CN110258500A (en) * | 2019-06-28 | 2019-09-20 | 中国二十冶集团有限公司 | The dam filling construction of soft foundation zone high liquid limit soil |
| CN110468669A (en) * | 2019-08-21 | 2019-11-19 | 山东大学 | Road high liquid limit clay precipitation and compaction technology |
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2019
- 2019-12-13 CN CN201911286029.XA patent/CN110965438A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101428909A (en) * | 2008-12-18 | 2009-05-13 | 武汉大学 | Composite artificial ecological floating island and construction method thereof |
| MX2012001594A (en) * | 2009-08-05 | 2012-06-27 | Proes S A | Flexible paving structure for streets and roads, comprised of a stabilized inferior base and an upper laying pavement of reduced thickness. |
| CN109437801A (en) * | 2018-12-14 | 2019-03-08 | 山东大学 | A kind of high liquid limit clay road modifying agent |
| CN110258500A (en) * | 2019-06-28 | 2019-09-20 | 中国二十冶集团有限公司 | The dam filling construction of soft foundation zone high liquid limit soil |
| CN110468669A (en) * | 2019-08-21 | 2019-11-19 | 山东大学 | Road high liquid limit clay precipitation and compaction technology |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114045714A (en) * | 2021-11-09 | 2022-02-15 | 成都城投建筑科技投资管理集团有限公司 | Construction process suitable for improving weathered soft rock roadbed filler as roadbed reinforcing layer |
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Application publication date: 20200407 |