CN104594148A - Classification processing method for high-liquid-limit soil in roadbed engineering - Google Patents
Classification processing method for high-liquid-limit soil in roadbed engineering Download PDFInfo
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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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- 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
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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Abstract
A disclosed classification processing method for high-liquid-limit soil in roadbed engineering comprises the following steps: S1, doping quicklime with high-liquid-limit soil for reducing water content; S2, employing plasticity index, CBR (California bearing ratio) value, liquid limit and fine-particle content to classify the high-liquid-limit soil processed in the step S1; and S3, respectively processing classified high-liquid-limit soil. The method helps to obviously reduce water content of soil, comprehensively gives consideration to improvement difference degree of doping sand, quicklime and cement to various physical properties of soil, and helps to effectively improve construction quality, reduce discarded soil or borrowed soil quantity, and save engineering cost, thereby promoting scientific utilization of high-liquid-limit soil.
Description
Technical field
The present invention relates to building field, particularly relate to the classification processing method of high liquid limit soil in a kind of subgrade construction.
Background technology
At present based on index of plasticity and fine particle content, high liquid limit soil is divided into the sorting technique that high liquid limit soil is conventional: high liquid limit clay, high liquid limit silt, sandy clay of high liquid limit with contain sand high liquid limit silt.Refer to table 1.
Table 1 high liquid limit soil engineering classification
| Great soil group | Liquid limit | Index of plasticity | Be less than 0.074mm fine particle content |
| High liquid limit clay | ≥50％ | ≥0.73(W L-20) | ≥75％ |
| High liquid limit silt | ≥50％ | ＜0.73(W L-20) | ≥75％ |
| Sandy clay of high liquid limit | ≥50％ | ≥0.73(W L-20) | 50%≤fine particle content≤75% |
| Containing sand high liquid limit silt | ≥50％ | ＜0.73(W L-20) | 50%≤fine particle content≤75% |
Because high liquid limit soil has many bad physical and mechanical properties such as Atterberg Limit is higher, natural moisture content is comparatively large, permeability is lower, compressibilty is larger, therefore high liquid limit soil need be solved following problem as embankment fill material: first, the problem of high natural moisture content, high liquid limit and high plasticity index; Secondly, low-intensity, high-compressibility and hypotonicity problem; Its three, high liquid limit soil fine particle content is too much, the problem of grain composition difference; Finally, the problem that water stability and compaction capacity are not good.
Summary of the invention
Object of the present invention is intended to the classification processing method proposing high liquid limit soil in a kind of subgrade construction, it is the high liquid limit soil sorting technique based on different index, and processing scheme is filled in the optimum improvement providing different classification high liquid limit soil, make the High liquid limit soil embankment after filling can meet long-time stability and deformation requirements, solve the technical barrier being badly in need of at present solving.
For solving above-mentioned technical barrier, the technical solution adopted in the present invention is:
In subgrade construction, a classification processing method for high liquid limit soil, comprises the steps:.
S1, high liquid limit soil is mixed quicklime, for reducing moisture content;
S2, the high liquid limit soil of employing these four indexs of index of plasticity, CBR value, liquid limit and fine particle content to S1 are classified;
S3, sorted high liquid limit soil to be processed respectively.
Preferably, in S1, high liquid limit soil mix that quicklime ratio is the moisture rate variance of compacting 1/3.
Preferably, in S2, employing liquid limit is 70%, fine particle content is 75%, index of plasticity is 10%, CBR value is that high liquid limit soil is subdivided into 16 classes by 3% these four separations.
Preferably, in S3, be less than 10% to index of plasticity, and CBR value is more than or equal to the high liquid limit soil of 3%, except liquid limit is less than or equal to 70%, fine particle content is less than or equal to outside 75% this kind of high liquid limit soil direct filling, and remaining classification is mixes sand improvement.
Further preferably, in S3, be less than 10% to index of plasticity, and CBR value is more than or equal to 3%, liquid limit is less than or equal to 70%, the high liquid limit soil that fine particle content is greater than 75%, and 10% is less than to index of plasticity, and CBR value is more than or equal to 3%, liquid limit is greater than 70%, fine particle content is less than or equal to the high liquid limit soil of 75%, its mix that sand ratio is at least weight ratio 15%; Be less than 10% to index of plasticity, and CBR value is more than or equal to 3%, liquid limit is greater than 70%, the high liquid limit soil that fine particle content is greater than 75%, its mix that sand ratio is at least weight ratio 20%.
Preferably, in S3, be more than or equal to 10% to index of plasticity, and the high liquid limit soil that CBR value is less than 3%, except liquid limit is greater than 70%, fine particle content is greater than 75% this kind of high liquid limit soil as outside the side's of abandoning process, and remaining classification is mixes cement improvement.
Further preferably, in S3, be more than or equal to 10% to index of plasticity, and CBR value is less than 3%, liquid limit is less than or equal to 70%, and fine particle content is less than or equal to the high liquid limit soil of 75%, its mix that cement proportion is at least weight ratio 2.5%; 10% is more than or equal to index of plasticity, and CBR value is less than 3%, liquid limit is less than or equal to 70%, the high liquid limit soil that fine particle content is greater than 75%, and 10% is more than or equal to index of plasticity, and CBR value is less than 3%, liquid limit is greater than 70%, fine particle content is less than or equal to the high liquid limit soil of 75%, its mix that cement proportion is at least weight ratio 3%.
Preferably, in S3, be more than or equal to 10%, CBR value to index of plasticity and be more than or equal to 3%, liquid limit is less than or equal to 70%, fine particle content is less than or equal to the high liquid limit soil of 75%, and 10%, CBR value is less than to index of plasticity is less than 3%, liquid limit is less than or equal to 70%, fine particle content is less than or equal to the high liquid limit soil of 75%, all adopts 2% cement improvement mixing at least weight ratio.
Preferably, in S3, be more than or equal to 10%, CBR value to index of plasticity and be more than or equal to 3%, liquid limit is greater than 70%, the high liquid limit soil that fine particle content is greater than 75%, and 10%, CBR value is less than to index of plasticity is less than 3%, liquid limit is greater than 70%, the high liquid limit soil that fine particle content is greater than 75%, all adopts the 25% sand improvement of mixing at least weight ratio.
Preferably, in S3, 10% is more than or equal to index of plasticity, CBR value is more than or equal to 3%, liquid limit is less than or equal to 70%, the high liquid limit soil that fine particle content is greater than 75%, 10% is more than or equal to index of plasticity, CBR value is more than or equal to 3%, liquid limit is greater than 70%, fine particle content is less than or equal to the high liquid limit soil of 75%, 10% is less than to index of plasticity, CBR value is less than 3%, liquid limit is less than or equal to 70%, the high liquid limit soil that fine particle content is greater than 75%, and 10% is less than to index of plasticity, CBR value is less than 3%, liquid limit is greater than 70%, fine particle content is less than or equal to the high liquid limit soil of 75%, all adopt and mix 10% sand of at least weight ratio and 1.5% cement improvement of at least weight ratio.
In such scheme, improving in natural moisture content: the natural moisture content of high liquid limit soil is general comparatively large, and during direct filling, consolidation effect is undesirable, easily occurring " spring soil " phenomenon.And mix quicklime, cement, sand and all improve soil moisture content, but improved effect difference is larger.General quicklime is best to the effect reducing high liquid limit soil moisture content, and cement takes second place, and sand is to the poorest to the effect reducing soil moisture content.But general comparatively large owing to mixing sand amount, thus also can reduce soil moisture content preferably.Cement lime mixing ratio is general very little, little to the contribution reducing soil moisture content, improves so should not be used alone cement.
Improving in liquid limit and index of plasticity: along with spike rate increases, soil body liquid limit reduces, and plastic limit increases, and index of plasticity is significantly declined, and hydrophily weakens greatly, and engineering properties is improved.Mix liquid limit and index of plasticity that quicklime, cement, sand all improve the soil body, but improved effect difference is larger.General sand conditioned soil body fluid limit effect is best, and cement takes second place, and quicklime is relatively poor; And the index of plasticity of the cement improvement soil body is best, sand takes second place, and quicklime is relatively poor.
Improving in fine particle content: mix quicklime, cement, sand and all improve soil body coarse granule content, but improved effect difference is larger.Sand directly can increase the coarse granule content of the soil body, and cement also can improve soil body grating preferably, and the effect of lime is relatively poor.From several spike scheme comparison, water mixing mud and sand compound effect slightly good.Mainly contain the reason of following two aspects: first, because sand grains is mixed, soil body grain composition is directly changed; Secondly, cement is mixed after in soil, and hydration reaction is very fast, makes the soil body form granule, adds the skeletal support effect of sand grains, can in the short time, soil mass property be improved.
Improving in compression performance: the compressibilty of high liquid limit soil is higher, belonging to high-compressibility soil layer, is the one of the main reasons causing the diseases such as crevice of roadbed, sinking, grout.Quicklime, cement or sand, all improve the compression performance of the soil body, strengthen the rigidity of the soil body, but improved effect is more or less the same.The compression performance of general cement improvement high liquid limit soil is best, and sand takes second place, and quicklime is relatively poor.
Improving in soil body CBR value: the CBR value of high liquid limit soil is general less, often can not meet code requirement, after mixing quicklime, cement, sand improvement, the CBR value of the soil body all can meet the requirement of embankment fill material, but improved effect differs greatly.The improved effect of general cement is best, and quicklime takes second place, and sand facies are to poor.
Therefore, mix quicklime, cement, sand and all can improve the natural moisture content of the soil body, liquid limit and index of plasticity, fine particle content, compression performance, CBR value, but improved effect is not quite similar.Cement is obvious to the index of plasticity and CBR value effectiveness comparison that improve high liquid limit soil, and sand and quicklime are relatively poor, and difference is little; Sand is obvious to the improvement fine particle content of high liquid limit soil, liquid limit effectiveness comparison, and cement and quicklime are relatively poor, and difference is little; Quicklime is to reducing the moisture content effect of high liquid limit soil clearly; And three kinds of materials are little to the compression performance aspect difference improving the soil body.Therefore, high liquid limit soil is carried out above-mentioned classification process by the present inventor, to play the improvement advantage of various material.
Thus, in technique scheme: in S1, high liquid limit soil is mixed a certain amount of quicklime and carry out stewing material process, thus reduce the natural moisture content of the soil body; In S2, adopt index of plasticity, CBR value, liquid limit, these four indexs of fine particle content as the classification foundation of high liquid limit soil.And index of plasticity equals 10% as the classification foundation of clay and silty clay; CBR value equals the minimum value requirement that 3% is super highway and Class I highway embankment fill material; It is generally acknowledged liquid limit be greater than 70% soil mass property very bad; The traditional classification standard of fine particle content to be 75% be high liquid limit soil (see table 1).Therefore adopt 10%, 3%, 70%, 75% these four nodes (or claiming separation) that high liquid limit soil is divided into 16 classes respectively; In S3, better according to the effect of mixing cement improvement index of plasticity and CBR value, and mix the sand improvement liquid limit of the soil body and the feature of fine particle content successful, 16 class high liquid limit soils are processed respectively, thus can provide mix sand, cement and their combination improvement filling scheme, and can for the physico-mechanical properties difference of the soil body, suitably adjustment spike ratio.
And the adjustment of spike ratio should follow following principle: 1, fine particle content is larger, liquid limit is larger, spike amount is more; 2, CBR value is less, and spike amount is more; 3, index of plasticity is larger, and spike amount is more.
Thus make invention significantly reduce the moisture content of the soil body, consider and mixed sand, quicklime, cement to the difference degree of the every physico-mechanical properties improvement of the soil body, effectively improved workmanship, reduce spoir or borrow earth quantity, save construction costs, thus promote the scientific utilization of high liquid limit soil.
Detailed description of the invention
Below by specific embodiment, the present invention is described in detail; but the purposes of these exemplary embodiments and object are only used for exemplifying the present invention; not any type of any restriction is formed to real protection scope of the present invention, more non-protection scope of the present invention is confined to this.
In subgrade construction, a classification processing method for high liquid limit soil, comprises the steps:
S1, high liquid limit soil mixed a certain amount of quicklime and carry out stewing material process, thus reduce the natural moisture content of the soil body; Natural moisture content due to high liquid limit soil is general comparatively large, and mixes quicklime and reduce soil moisture content effect clearly, and therefore a general mix process of being carried out by high liquid limit soil mixes the stewing material process of quicklime, the mixing quicklime amount and can preferably be calculated as follows of high liquid limit soil:
n
c＝c/3；
In formula: n
cquicklime ratio is mixed for the soil body; C is the moisture rate variance of compacting (the moisture rate variance of this compacting is defined as: the difference of optimum moisture content and natural moisture content) of the soil body, is generally the average of three groups of result of the tests.
S2, employing index of plasticity, CBR value (California Bearing Rat io---California Bearing Ratio), liquid limit and the high liquid limit soil of these four indexs of fine particle content to S1 classify; Due to improved materials on compression performance and unconfined compression strength to affect difference little, and on fine particle content, liquid limit, index of plasticity, the impact of CBR value comparatively obviously, therefore generally adopt these four indexs to classify to high liquid limit soil.Further, index of plasticity equals 10% as the classification foundation of clay and silty clay; CBR value equals the minimum value requirement that 3% is super highway and Class I highway embankment fill material; It is generally acknowledged liquid limit be greater than 70% soil mass property very bad; The traditional classification standard of fine particle content to be 75% be high liquid limit soil (see table 1).Therefore adopt 10%, 3%, 70%, 75% these four nodes (or claiming separation) that high liquid limit soil is divided into 16 classes respectively; 16 concrete class classifications are see table 2.
Table 2 is divided into the high liquid limit soil of 16 classes
S3, sorted high liquid limit soil to be processed respectively.Better according to the effect of mixing cement improvement index of plasticity and CBR value, and mix the sand improvement liquid limit of the soil body and the feature of fine particle content successful, 16 class high liquid limit soils are processed respectively, thus can provide mix sand, cement and their combination evolutionary approach, and for the physico-mechanical properties difference of the soil body, suitably adjustment spike ratio.Concrete see table 3.
Table 3 processes respectively to 16 class high liquid limit soils
The ratio of mixing sand and cement in upper table 3 is weight ratio.Classification sequence number 1-16 corresponding 1-16 class high liquid limit soil respectively in table 2 and table 3, but it should be noted that, 1st class represents just in order to distinguish classification to the 16th class sequence number, the relation of tandem is not had between them, they can arrange in any order, thus obtain the sequence number of other arbitrary 1-16.
After having had table 3, when constructing, first high liquid limit soil being done laboratory test, obtaining liquid limit, index of plasticity, fine particle content and CBR value these four indexs, then table look-up 3 obtain in 16 classes belonging to this high liquid limit soil which kind of, corresponding processing scheme can be obtained.
By processing respectively the high liquid limit soil of the present invention's difference classification, significantly reduce the moisture content of the soil body, consider and mixed sand, quicklime, cement to the difference degree of the every physico-mechanical properties improvement of the soil body, effective raising workmanship, reduce spoir or borrow earth quantity, save construction costs, thus promote the scientific utilization of high liquid limit soil.
Should be appreciated that embodiment is only not intended to for illustration of the present invention limit the scope of the invention.In addition; also should understand; after having read technology contents of the present invention, those skilled in the art can make various change, amendment and/or modification to the present invention, and these all equivalent form of values fall within the protection domain that the application's appended claims limits equally.
Claims (10)
1. the classification processing method of high liquid limit soil in subgrade construction, is characterized in that, comprise the steps:
S1, high liquid limit soil is mixed quicklime, for reducing moisture content;
S2, the high liquid limit soil of employing these four indexs of index of plasticity, CBR value, liquid limit and fine particle content to S1 are classified;
S3, sorted high liquid limit soil to be processed respectively.
2. the classification processing method of high liquid limit soil in subgrade construction according to claim 1, is characterized in that, in S1, high liquid limit soil mix that quicklime ratio is the moisture rate variance of compacting 1/3.
3. the classification processing method of high liquid limit soil in subgrade construction according to claim 1 and 2, it is characterized in that, in S2, employing liquid limit is 70%, fine particle content is 75%, index of plasticity is 10%, CBR value is that high liquid limit soil is subdivided into 16 classes by 3% these four separations.
4. the classification processing method of high liquid limit soil in subgrade construction according to claim 3, it is characterized in that, in S3,10% is less than to index of plasticity, and CBR value is more than or equal to the high liquid limit soil of 3%, except liquid limit is less than or equal to 70%, fine particle content is less than or equal to outside 75% this kind of high liquid limit soil direct filling, and remaining classification is mixes sand improvement.
5. the classification processing method of high liquid limit soil in subgrade construction according to claim 4, it is characterized in that, in S3,10% is less than to index of plasticity, and CBR value is more than or equal to 3%, liquid limit is less than or equal to 70%, the high liquid limit soil that fine particle content is greater than 75%, and is less than 10% to index of plasticity, and CBR value is more than or equal to 3%, liquid limit is greater than 70%, and fine particle content is less than or equal to the high liquid limit soil of 75%, its mix that sand ratio is at least weight ratio 15%; Be less than 10% to index of plasticity, and CBR value is more than or equal to 3%, liquid limit is greater than 70%, the high liquid limit soil that fine particle content is greater than 75%, its mix that sand ratio is at least weight ratio 20%.
6. the classification processing method of high liquid limit soil in subgrade construction according to claim 3, it is characterized in that, in S3,10% is more than or equal to index of plasticity, and the high liquid limit soil that CBR value is less than 3%, except liquid limit is greater than 70%, fine particle content is greater than 75% this kind of high liquid limit soil as outside the side's of abandoning process, and remaining classification is mixes cement improvement.
7. the classification processing method of high liquid limit soil in subgrade construction according to claim 6, it is characterized in that, in S3,10% is more than or equal to index of plasticity, and CBR value is less than 3%, liquid limit is less than or equal to 70%, and fine particle content is less than or equal to the high liquid limit soil of 75%, its mix that cement proportion is at least weight ratio 2.5%; 10% is more than or equal to index of plasticity, and CBR value is less than 3%, liquid limit is less than or equal to 70%, the high liquid limit soil that fine particle content is greater than 75%, and 10% is more than or equal to index of plasticity, and CBR value is less than 3%, liquid limit is greater than 70%, fine particle content is less than or equal to the high liquid limit soil of 75%, its mix that cement proportion is at least weight ratio 3%.
8. the classification processing method of high liquid limit soil in subgrade construction according to claim 3, it is characterized in that, in S3,10% is more than or equal to index of plasticity, CBR value is more than or equal to 3%, liquid limit is less than or equal to 70%, and fine particle content is less than or equal to the high liquid limit soil of 75%, and is less than 10% to index of plasticity, CBR value is less than 3%, liquid limit is less than or equal to 70%, and fine particle content is less than or equal to the high liquid limit soil of 75%, all adopts 2% cement improvement mixing at least weight ratio.
9. the classification processing method of high liquid limit soil in subgrade construction according to claim 3, it is characterized in that, in S3,10% is more than or equal to index of plasticity, CBR value is more than or equal to 3%, liquid limit is greater than 70%, the high liquid limit soil that fine particle content is greater than 75%, and is less than 10% to index of plasticity, CBR value is less than 3%, liquid limit is greater than 70%, the high liquid limit soil that fine particle content is greater than 75%, all adopts the 25% sand improvement of mixing at least weight ratio.
10. the classification processing method of high liquid limit soil in subgrade construction according to claim 3, it is characterized in that, in S3, 10% is more than or equal to index of plasticity, CBR value is more than or equal to 3%, liquid limit is less than or equal to 70%, the high liquid limit soil that fine particle content is greater than 75%, 10% is more than or equal to index of plasticity, CBR value is more than or equal to 3%, liquid limit is greater than 70%, fine particle content is less than or equal to the high liquid limit soil of 75%, 10% is less than to index of plasticity, CBR value is less than 3%, liquid limit is less than or equal to 70%, the high liquid limit soil that fine particle content is greater than 75%, and 10% is less than to index of plasticity, CBR value is less than 3%, liquid limit is greater than 70%, fine particle content is less than or equal to the high liquid limit soil of 75%, all adopt and mix 10% sand of at least weight ratio and 1.5% cement improvement of at least weight ratio.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106192975A (en) * | 2016-08-31 | 2016-12-07 | 四川和天下科技有限公司 | A kind of reinforcement method of the soil body |
| CN107119521A (en) * | 2017-05-25 | 2017-09-01 | 中国水利水电第十工程局有限公司 | It is a kind of to improve the method that High water cut silt and silt carry out roadbed filling |
| CN116698670A (en) * | 2022-12-12 | 2023-09-05 | 青岛理工大学 | Soil classification method for realizing agglomerate content evaluation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3756884B2 (en) * | 2003-03-17 | 2006-03-15 | みらい建設工業株式会社 | How to improve soft soil |
| CN101768950A (en) * | 2010-01-19 | 2010-07-07 | 广东省长大公路工程有限公司 | Improving method of high liquid limit soil in subgrade engineering |
| CN102322007B (en) * | 2011-06-30 | 2012-12-19 | 广东省长大公路工程有限公司 | Control method of compaction degree of layered filling of high liquid limit soil |
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2014
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106192975A (en) * | 2016-08-31 | 2016-12-07 | 四川和天下科技有限公司 | A kind of reinforcement method of the soil body |
| CN107119521A (en) * | 2017-05-25 | 2017-09-01 | 中国水利水电第十工程局有限公司 | It is a kind of to improve the method that High water cut silt and silt carry out roadbed filling |
| CN107119521B (en) * | 2017-05-25 | 2019-12-17 | 中电建十一局工程有限公司 | Method for improving high-water-content silt and silt soil to fill roadbed |
| CN116698670A (en) * | 2022-12-12 | 2023-09-05 | 青岛理工大学 | Soil classification method for realizing agglomerate content evaluation |
| CN116698670B (en) * | 2022-12-12 | 2024-01-26 | 青岛理工大学 | Soil classification method for realizing agglomerate content evaluation |
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Address after: 233000 South Side of Zhanggongshan Road, Donghai Avenue, Bengbu City, Anhui Province Patentee after: Anhui Construction Engineering Group Co.,Ltd. Address before: 233000 South Side of Zhanggongshan Road, Donghai Avenue, Bengbu City, Anhui Province Patentee before: ANHUI WATER RESOURCES DEVELOPMENT Co.,Ltd. |
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