CN107245920A - A kind of composite modifying method of durability high liquid limit soil roadbed filling - Google Patents
A kind of composite modifying method of durability high liquid limit soil roadbed filling Download PDFInfo
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- CN107245920A CN107245920A CN201710481732.0A CN201710481732A CN107245920A CN 107245920 A CN107245920 A CN 107245920A CN 201710481732 A CN201710481732 A CN 201710481732A CN 107245920 A CN107245920 A CN 107245920A
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- liquid limit
- high liquid
- soil
- limit soil
- quick lime
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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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2103/00—Civil engineering use
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Architecture (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a kind of composite modifying method of durability high liquid limit soil roadbed filling, it is to use high water absorbency polymer（SAP）It is composite modified to high liquid limit soil progress with quick lime, so as to obtain the compound conditioned soil available for roadbed filling that CBR values are more than 8%；Wherein, SAP consumption is that the consumption of the 0.01% ~ 0.1% of high liquid limit soil weight, quick lime is the 1% ~ 10% of high liquid limit soil weight.Composite modifying method of the present invention can strengthen intensity, water stability, durability of high liquid limit soil etc., high liquid limit soil is turned waste into wealth, and meet roadbed filling requirement, so as to provide effective scheme for roadbed filling for high liquid limit soil.
Description
Technical field
The invention belongs to field of engineering technology, it is related to a kind of processing method of road engineering unfavorable foundation, and in particular to one
Plant durability high liquid limit soil roadbed filling composite modifying method.
Background technology
High liquid limit soil is distributed in more than 20 provinces, municipalities and autonomous regions of China, and institute's area coverage is up to 100,000 km2More than, mainly include
Weak soil, swelled ground, admaic earth, organic soil etc., with natural moisture content is big, plasticity index is high, liquid limit is high, low intensity, water is steady
The undesirable features such as qualitative poor, poor durability, constructional difficulties, are embodied in：（1）Granule content less than 0.074mm is more than
50%th, liquid limit WL>50%th, plasticity index Ip>26th, natural moisture content（More than optimum moisture content 3%）；（2）When water content is smaller, soil
Body intensity is high, increases with moisture content, due to soil body swell-shrink characteristics, strength retrogression is very fast；（3）Rammability is poor, due to high liquid limit
Itself native higher moisture content, is extremely difficult to that moisture content can be compacted, so that roadbed filling requirement can not be met.
With the high speed development of highway construction, the high liquid limit soil being largely distributed is used for roadbed filling, at the same time, great Liang Gong
Road engineering disease emerges in an endless stream, and mainly includes：Roadbed inhomogeneous deformation, top-crack, side slope are collapsed.High liquid limit soil fills road
The most simple and effective processing method of base is to be discarded, however, coastal areas of Fujian province high liquid limit soil is distributed wide model, roadbed filling
Amount is big, and so doing not only needs to look for stacking place for these spoirs, causes large area land seizure, in addition it is also necessary to find engineer applied
Soil of good performance, the problems such as causing costly, environmental disruption.Thus, seek rational evolutionary approach and seem particularly significant.
By largely investigating discovery, the modification method of high liquid limit soil is mainly shown as：（1）Physics method for strengthening, i.e., with machinery,
The improved method of construction technology is reinforced to filling the soil body, but does not change the intrinsic property of the soil body.（2）Chemical stabilization,
It is by adding additive, the intrinsic property of soil property is changed.（3）Integrative consolidation method, is that additive is added in soil,
In conjunction with physics method for strengthening, change the mechanical characteristic of the soil body.
Based on high liquid limit soil natural moisture content is big, physics method for strengthening long construction period the features such as, during roadbed filling to drying,
Roll and bring very big puzzlement, so being not appropriate for high liquid limit soil using physics method for strengthening.And chemical consolidation improvement adds to the soil body
Gu more rapidly, make construction more convenient, moreover it is possible to be reinforced using a variety of composition of concrete admixture, combination is versatile and flexible, so chemistry changes
Good method is more suitable.
The content of the invention
It is an object of the invention to provide a kind of durability high liquid limit soil roadbed filling composite modifying method, it may be such that
Compound conditioned soil have stronger water stability and intensity, to meet roadbed filling requirement, so as to solve the place of high liquid limit soil
Control problem.
To achieve the above object, the present invention is adopted the following technical scheme that：
A kind of composite modifying method of durability high liquid limit soil roadbed filling, it is to use high water absorbency polymer（SAP）And life
Lime is composite modified to high liquid limit soil progress, the composite modified native CBR values of gained is more than 8%；
Wherein, the high liquid limit soil is manipulated soil, crosses 2mm sieves；
The water imbibition of the SAP is more than 500%, and its consumption is the 0.01% ~ 0.1% of high liquid limit soil weight, preferably 0.06%；
Calcium oxide in the quick lime（CaO）Content be more than 95%, its consumption be high liquid limit soil weight 1% ~ 10%, be preferably
4%。
The composite modifying method of the durability high liquid limit soil roadbed filling comprises the following steps：
1）SAP, quick lime and high liquid limit soil are taken in proportion, it is standby；
2）SAP is added in high liquid limit soil, 200 ~ 500rpm is mixed and stirred 5 ~ 10 minutes；
3）Quick lime is added, continuing to stir is well mixed 10 ~ 20 minutes it, that is, obtain can be used in the compound of roadbed filling changing
Good soil.
The beneficial effects of the present invention are：
The present invention carries out compound improvement to high liquid limit soil using SAP and quick lime both materials are common, wherein, SAP have compared with
Strong water sorption, it is possible to decrease the moisture content of high liquid limit soil, is that the aquation of quick lime is anti-while moisture can be kept to be difficult dissipation
Favorable environment should be provided, so as to be favorably improved the intensity of high liquid limit soil；And the use of quick lime can not only strengthen soil strength,
Improve the CBR values of the soil body.Compared with traditional single use quick lime modification method, the present invention changes using SAP and quick lime are compound
Good method can not only save quick lime consumption, and SAP water retention characteristic can be that the growth of later stage quick lime intensity and maintenance are provided
There is force environment, and then effectively improve intensity, crack resistance, water stability, anti-drying and watering cycle ability of high liquid limit soil etc., to meet road
Base fills requirement.
Brief description of the drawings
Fig. 1 makes a living lime-stabilized soil in tamping curve figure.
After Fig. 2 is the different number of times of drying and watering cycle, the intensity variation curve figure of conditioned soil is combined.
Embodiment
A kind of composite modifying method of durability high liquid limit soil roadbed filling, it is to use high water absorbency polymer（SAP）
It is composite modified to high liquid limit soil progress with quick lime, the composite modified native CBR values of gained is more than 8%；
Wherein, the high liquid limit soil is manipulated soil, crosses 2mm sieves；
The water imbibition of the SAP is more than 500%, and its consumption is the 0.01% ~ 0.1% of high liquid limit soil weight, preferably 0.06%；
Calcium oxide in the quick lime（CaO）Content be more than 95%, its consumption be high liquid limit soil weight 1% ~ 10%, be preferably
4%。
The composite modifying method of the durability high liquid limit soil roadbed filling comprises the following steps：
1）SAP, quick lime and high liquid limit soil are taken in proportion, it is standby；
2）SAP is added in high liquid limit soil, 200 ~ 500rpm is mixed and stirred 5 ~ 10 minutes；
3）Quick lime is added, continuing to stir is well mixed 10 ~ 20 minutes it, that is, obtain can be used in the compound of roadbed filling changing
Good soil.
In order that content of the present invention easily facilitates understanding, with reference to embodiment to of the present invention
Technical scheme is described further, but the present invention is not limited only to this.
1st, experiment soil
Experiment is derived from the foreign Expressway Extension Project A4 bid sections of Fujian Province ZhangZhou Tian Bao to Longyan flood dragon with soil, and section pile No. is
K59+560 ~ K67+150, soil sample is that concrete property parameter is as shown in table 1 containing sand high liquid limit silt.
The high liquid limit soil physical characteristics of table 1
2nd, high liquid limit soil roadbed filling is composite modified
（1）Experiment is divided into 4 groups, is respectively 2%, 4%, 6%, 8% by quick lime volume（It is the mass ratio of the same soil body）By itself and baking
The uniform mix of high liquid limit soil that is dry, crossing 2mm sieves, using a diameter of 39.1mm, a height of 80mm mould sample preparation, filling should be by mould before sample
Tool inwall first smears vaseline, is wrapped up with preservative film.
Carry out compaction test to the soil sample prepared under four groups of different quick lime contents, the optimum moisture content of gained each group and most
As shown in table 2, gained tamping curve is as shown in Figure 1 for big dry density situation.
The compaction test results of the quick lime conditioned soil of table 2
（2）It is respectively first 2%, 4%, 6%, 8% by quick lime volume（It is the mass ratio of the same soil body）It is divided into 4 groups, then by SAP volumes
Respectively 0%, 0.03%, 0.06%, 0.09%（It is the mass ratio of the same soil body）The each group of different quick lime volumes is further divided into 4
Part.（1）On the basis of, examination is calculated according to the proportioning of each group optimum moisture content, 93% compactness, mould volume and each volume
Conditioned soil gross mass needed for sample, then by two kinds of additives respectively with the uniform mix of high liquid limit soil（SAP materials are first added, then are added
Plus quick lime）Carry out sample preparation.
The sample prepared is put in temperature for 20 ± 2 DEG C, health 28d respectively under conditions of relative humidity 95% waits to support
After life terminates, wetting-drying test is carried out to sample（Soak 12h, and it is one cycle that 12h is dried at 60 DEG C）, respectively carry out 7 times, 12
Secondary circulation, is put on WDW-10 type microcomputer control electronic type standard universal testing machines after end to be recycled and carries out unconfined compressive strength
Test, the control of forcing press translational speed is in 2mm/min, and as shown in table 3, intensity variation curve is as schemed after drying and watering cycle for acquired results
Shown in 2.
The unconfined compressive strength value of the conditioned soil after different drying and watering cycles of table 3
From the above results, the resistance to compression intensity values of the compound conditioned soil of admixture SAP and quick lime are all higher than mixing single than under on an equal basis
Quick lime conditioned soil；When quick lime content is 4%, the intensity increase tendency of compound conditioned soil reaches maximum；And when quick lime content
When for 4%, SAP contents being 0.06%, 7 times, the compression strength value after 12 circulations it is maximum, respectively 1.03MPa, 0.96MPa,
More than the compression strength under other SAP volumes.As known from the above, it is compound change when quick lime content 4%, SAP contents are 0.06%
The optimal proportion of good high liquid limit soil.
（3）The CBR values tested under optimal proportion, as a result as shown in table 4.
The CBR values of conditioned soil under the optimal proportion of table 4
From table 4, its CBR value is all higher than 20%, fully meets roadbed filling requirement.
The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, should all belong to the covering scope of the present invention.
Claims (4)
1. a kind of composite modifying method of durability high liquid limit soil roadbed filling, it is characterised in that：Using SAP and quick lime to height
Liquid limit soil progress is composite modified, the composite modified native CBR values of gained is more than 8%；
Wherein, SAP consumption be that the consumption of the 0.01% ~ 0.1% of high liquid limit soil weight, quick lime is high liquid limit soil weight 1% ~
10%。
2. composite modifying method according to claim 1, it is characterised in that：The high liquid limit soil is manipulated soil, crosses 2mm
Sieve.
3. composite modifying method according to claim 1, it is characterised in that：SAP used water imbibition is more than 500%；It is used
The content of calcium oxide is more than 95% in quick lime.
4. composite modifying method according to claim 1, it is characterised in that：Comprise the following steps：
1）SAP, quick lime and high liquid limit soil are taken in proportion, it is standby；
2）SAP is added in high liquid limit soil, 200 ~ 500rpm is mixed and stirred 5 ~ 10 minutes；
3）Quick lime is added, continuing to stir is well mixed 10 ~ 20 minutes it, that is, obtain can be used in the compound of roadbed filling changing
Good soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710481732.0A CN107245920A (en) | 2017-06-22 | 2017-06-22 | A kind of composite modifying method of durability high liquid limit soil roadbed filling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710481732.0A CN107245920A (en) | 2017-06-22 | 2017-06-22 | A kind of composite modifying method of durability high liquid limit soil roadbed filling |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109440543A (en) * | 2018-10-22 | 2019-03-08 | 华东交通大学 | Phyllite saprolite and admaic earth mixing modification method and blending method |
| CN113185195A (en) * | 2021-04-28 | 2021-07-30 | 中建五局土木工程有限公司 | Improved composite roadbed filling and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1843987A (en) * | 2006-04-26 | 2006-10-11 | 江苏聚慧科技有限公司 | Construction method by utilizing solidified earth from sludge |
| CN102173695A (en) * | 2011-01-10 | 2011-09-07 | 东南大学 | Novel composite additive for solidifying material for dredged silt with high water content |
| CN105165325A (en) * | 2015-08-19 | 2015-12-23 | 北华航天工业学院 | Ecological protecting method for low liquid limit powdery clay side slope |
| CN105198367A (en) * | 2015-08-17 | 2015-12-30 | 广州市建筑科学研究院有限公司 | Curing agent capable of rapidly curing sludge at room temperature and use method thereof |
-
2017
- 2017-06-22 CN CN201710481732.0A patent/CN107245920A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1843987A (en) * | 2006-04-26 | 2006-10-11 | 江苏聚慧科技有限公司 | Construction method by utilizing solidified earth from sludge |
| CN102173695A (en) * | 2011-01-10 | 2011-09-07 | 东南大学 | Novel composite additive for solidifying material for dredged silt with high water content |
| CN105198367A (en) * | 2015-08-17 | 2015-12-30 | 广州市建筑科学研究院有限公司 | Curing agent capable of rapidly curing sludge at room temperature and use method thereof |
| CN105165325A (en) * | 2015-08-19 | 2015-12-23 | 北华航天工业学院 | Ecological protecting method for low liquid limit powdery clay side slope |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109440543A (en) * | 2018-10-22 | 2019-03-08 | 华东交通大学 | Phyllite saprolite and admaic earth mixing modification method and blending method |
| CN113185195A (en) * | 2021-04-28 | 2021-07-30 | 中建五局土木工程有限公司 | Improved composite roadbed filling and preparation method thereof |
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| PB01 | Publication | ||
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Application publication date: 20171013 |