CN102182175B - Method for inhibiting swelling-shrinking property of swelling soil - Google Patents
Method for inhibiting swelling-shrinking property of swelling soil Download PDFInfo
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- CN102182175B CN102182175B CN2011100835159A CN201110083515A CN102182175B CN 102182175 B CN102182175 B CN 102182175B CN 2011100835159 A CN2011100835159 A CN 2011100835159A CN 201110083515 A CN201110083515 A CN 201110083515A CN 102182175 B CN102182175 B CN 102182175B
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- pulverized limestone
- rubble
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- swelling
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Abstract
The invention relates to a method for inhibiting the swelling-shrinking property of swelling soil. An undisturbed method is adopted; the physical and chemical mechanism of the chemical property of lime and the clay mineral effect in swelling soil is utilized; gravel or a mixed material of break stone and lime powder is used as a material for inhibiting the swelling-shrinking deformation of the swelling soil; and a covering material is laid at the upper part of the gravel or the mixed material of break stone and lime powder according to the concrete condition of practical engineering so as to ensure that the gravel or the mixed material of break stone and lime powder can be moulded, and the effect is normally exerted. By adopting the method the swelling-shrinking property of the swelling soil can be inhibited under the condition that disturbance on the soil structure is reduced as much as possible, construction procedure is simple and following repair remedial measure is easier to implement.
Description
Technical field
The present invention relates to the method for a kind of repression of swelling soil swell-shrink characteristic in the Soil Mechanics and Foundations Foundation Design.
Background technology
Expansive soil contains more clay mineral, because of the sensitiveness of the stronger clay mineral of hydrophily to water, makes expansive soil have imbibition; Dehydration is shunk; Expand the again characteristic of this repeated expansion and shrinkage of suction again, and intensity declines by a big margin after imbibition, and engineering is constituted very big harm.The ground of swelled ground area, side slope; And as the expansive soil of constructional materials; Long term exposure is in atmospheric environment; The soil body of its following certain depth in surface receives the strong influence of Atmospheric precipitation, evaporation and variations in temperature, how to prevent that harm that its repeated expansion and shrinkage property and strength retrogression cause engineering from being one of main difficult problem of being faced of swelled ground area engineering construction.To expansive soil breathing mechanism; The measure of taking for the swell-shrink characteristic of inhibition or minimizing expansive soil both at home and abroad at present mainly contains two kinds: (1) sealing method; Keep its moisture content not change as far as possible; Promptly the moisture content of expansive soil is remained unchanged, thereby reach the purpose that its volume does not change through methods such as covering, seal; (2) modification method; Promptly through in expansive soil, adding the various materials that can reduce its swell-shrink characteristic; Its soil nature is changed and engineering demands, and method of modifying divides from principle, mainly contains three kinds of physics methods, chemical method, synthesis; Chemic modified method is used extensivelyr in three kinds of methods, and it is maximum wherein to adopt lime that expansive soil is carried out the chemical modification proportion.Also there are some problems at present in above-mentioned two kinds of methods in practical applications: the sealing effect of (1) sealing method is difficult to guarantee; Particularly, be difficult to prevent that expansive soil moisture from changing to the closure construction of bigger foundation of area or volume ratio or earthen structure difficulty relatively.(2) modification method all is to adopt the method for mixing and stirring, and the material modified and expansion earth material personnel selection worker or the machinery that are about to doses mix and stir, and make material modified and the expansive soil uniform mixing as far as possible; But because generally the natural aqueous rate of expansive soil is all than higher, mass of soil is difficult for disperseing; Make material modified being difficult to evenly mix and stir with expansive soil; When particularly adopting the chemical modification material, major part is material modified all to be the surface attached to mass of soil, and the effect of modification is very limited; And for the expansive soil slope of needs protection; If adopt present conventional method of modifying; Must produce bigger disturbance to the expansive soil of certain depth on the side slope surface; Consequently material modified and expansive soil are difficult to even mix, and the also difficulty relatively of compacting on domatic of the compound behind the mix.And these two kinds of methods are big to soil disturbance, working procedure is complicated, time-consuming, also exist construction quality to be difficult to obtain assurance, be difficult to produce a desired effect, take the also problem of difficulty relatively of follow-up remedial measure.
Summary of the invention
The objective of the invention is: big for arranging of solving present inhibition or reduce that the swell-shrink characteristic of expansive soil takes to soil disturbance, working procedure is complicated, time-consuming; Construction quality is difficult to obtain assurance, makes Expected Results be difficult to reach, and takes the problem of follow-up remedial measure difficulty; The present invention provides a kind of method of repression of swelling soil swell-shrink characteristic; Adopt non-turbulent method, utilize the chemical property of lime and the physical chemical mechanism of expansive soil CLAY MINERALS AND THEIR SIGNIFICANCE effect, repression of swelling soil swell-shrink characteristic under as far as possible reducing the situation of soil disturbance; And working procedure is simple, takes follow-up reparation remedial measure also to implement than being easier to.
The technical scheme that the present invention adopts comprises following method step:
1. the pulverized limestone compound is mixed by gravel or rubble and pulverized limestone; At first prepare gravel or rubble and the pulverized limestone of particle diameter at 5-60mm; Pulverized limestone can be with quicklime or slaked lime; According to gravel or rubble bulk density calculate its porosity; Calculate the volume of filling gravel or rubble hole according to the bulk density of pulverized limestone again; Then gravel or rubble are become the pulverized limestone compound with pulverized limestone equals gravel or rubble according to volume ratio stacking volume with the ratio mix of the voids volume of gravel or rubble, so just can guarantee that gravel or gravel particle can form the skeleton that is in contact with one another in the pulverized limestone compound, lime then is filled in the hole of gravel or rubble;
2. suppress to take place the expansive soil situation of swell-shrinking deformation as required; Definite amount of lime that needs; According to the required gravel of the amount inverse of lime or the amount of rubble, mix becomes the pulverized limestone compound again, with the expansive soil soil body higher slice compacting of pulverized limestone compound in the needs protection;
3. after the compacting of pulverized limestone compound covers,, re-lay cladding material on the top of pulverized limestone compound again according to engineering actual conditions and requirement, can closely knit moulding to guarantee the pulverized limestone compound, its effect can normally be brought into play.
Advantage of the present invention is:
The present invention adopts the pulverized limestone compound that the material of breathing takes place as repression of swelling soil; Be to construct on the expansive soil surface of its swell-shrink characteristic of needs inhibition, construction is convenient, and construction technology is simple; Quality is easy to guarantee, and takes follow-up reparation remedial measure also to implement than being easier to;
Adopt this form of structure, can be easy to reach the purpose of the native swell-shrink characteristic of repression of swelling.When the outside moisture of Atmospheric precipitation or cladding material will get into expansive soil when inner by external surface; At first to pass through gravel or rubble and pulverized limestone compound; The moisture that gets into so at first can contact with lime, has just become whitewash, and lime is just realized the expansion inhibitory action of cohesive soil thereupon.
Self strength ratio of pulverized limestone compound is higher, can not re-lay at an upper portion thereof between cladding material and the expansive soil and form weak intercalated layer, and can reduce water to by the washing away of protection expansive soil, and can play good cushioning effect.
Description of drawings
Fig. 1 is a sketch map of the present invention.
As shown in the figure: expansive soil 1, pulverized limestone compound 2, cladding material 3.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation.Fig. 1 is a sketch map of the present invention; Adopt the material of pulverized limestone compound 2 as repression of swelling soil 1 swell-shrinking deformation; Pulverized limestone compound 2 is mixed by gravel or rubble and pulverized limestone; On the top of pulverized limestone compound 2 again according to the concrete condition of actual engineering with require to lay cladding material 3, can moulding to guarantee gravel or rubble and pulverized limestone compound, its effect can normally be brought into play.
Ground, side slope or as expansive soil 1 preparation of construction of constructional materials ready after; Fill pulverized limestone compound 2 at expansive soil 1 higher slice; And with suitable compacting equipment with its compacting, lay the moulding that cladding material 3 is used to keep pulverized limestone compound 2 then in the above.
After water saw through cladding material 3 and gets in the pulverized limestone compounds 2, if when the lime in the pulverized limestone compound 2 adopts calcium lime powder, lime at first produced Ca (OH) with the water reaction after meeting water
2, unnecessary water then with the dissolving Ca (OH)
2Form Ca (OH)
2Solution; When if the lime in the pulverized limestone compound 2 adopts slaked lime powder, lime forms Ca (OH) after meeting water
2Solution; The water that gets in gravel or rubble and the pulverized limestone compound 2 continues to increase again, surpasses the carrying capacity of lime gravel compound, then Ca (OH)
2Solution begin in the expansive soil of bottom to flow Ca (OH)
2With the reaction of clay mineral in the expansive soil, the Main physical chemical reaction has ion-exchange reactions, pozzolanic reaction and carbonation reaction.These physical-chemical reactions make that repulsion reduces between grogs, impel the soil particle coagulation conglomeration, form crumb structure, generate hydraulicity hydrate crystalline solid, form skeleton with the grogs weave in, make the increase of soil strength and rigidity, and Ca (OH)
2React with the CaO in the water and air, generate the higher CaCO of intensity
3, the frame strength of the soil body is increased.Like this, lime to the modification of expansive soil just with Ca (OH)
2Infiltrating of solution and realize easily, thereby the swell-shrink characteristic of repression of swelling soil effectively.
Claims (1)
1. the method for repression of swelling soil swell-shrink characteristic is characterized in that it comprises following method step:
A. pulverized limestone compound (2) is mixed by gravel or rubble and pulverized limestone; At first prepare gravel or rubble and the pulverized limestone of particle diameter at 5-60mm; Pulverized limestone is with calcium lime powder or slaked lime powder; According to gravel or rubble bulk density calculate its porosity; Calculate the volume of filling gravel or rubble hole according to the bulk density of pulverized limestone again; Then gravel or rubble are become pulverized limestone compound (2) with pulverized limestone equals gravel or rubble according to volume ratio stacking volume with the ratio mix of the voids volume of gravel or rubble, so just can guarantee that gravel or gravel particle can form the skeleton that is in contact with one another in pulverized limestone compound (2), lime then is filled in the hole of gravel or rubble;
B. suppress to take place the situation of swell-shrinking deformation swelled ground (1) based on needs; Definite amount of lime that needs; Again based on the required gravel of the amount inverse of lime or the amount of rubble; Mix becomes pulverized limestone compound (2), with swelled ground (1) soil body higher slice compacting of pulverized limestone compound (2) in the needs protection;
C. pulverized limestone compound (2) covers after the compacting well; Again according to engineering actual conditions and requirement; Re-lay cladding material (3) on the top of pulverized limestone compound (2), can closely knit moulding to guarantee pulverized limestone compound (2), its effect can normally be brought into play.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100835159A CN102182175B (en) | 2011-04-02 | 2011-04-02 | Method for inhibiting swelling-shrinking property of swelling soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100835159A CN102182175B (en) | 2011-04-02 | 2011-04-02 | Method for inhibiting swelling-shrinking property of swelling soil |
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| Publication Number | Publication Date |
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| CN102182175A CN102182175A (en) | 2011-09-14 |
| CN102182175B true CN102182175B (en) | 2012-06-06 |
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| CN2011100835159A Expired - Fee Related CN102182175B (en) | 2011-04-02 | 2011-04-02 | Method for inhibiting swelling-shrinking property of swelling soil |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105951551A (en) * | 2016-05-11 | 2016-09-21 | 中铁第勘察设计院集团有限公司 | Improvement method of expansive soil roadbed filling |
| CN106142732A (en) * | 2016-06-23 | 2016-11-23 | 安徽徽风新型合成材料有限公司 | A kind of processing technology of Peng Run soil pad |
| CN106638196B (en) * | 2016-12-09 | 2019-05-31 | 中国神华能源股份有限公司 | A kind of stabilized expansive soil roadbed filling and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1850702A (en) * | 2006-05-12 | 2006-10-25 | 河海大学 | Hexadecyl trimethyl ammonium bromide expansive soil improvement agent |
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2011
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1850702A (en) * | 2006-05-12 | 2006-10-25 | 河海大学 | Hexadecyl trimethyl ammonium bromide expansive soil improvement agent |
Non-Patent Citations (5)
| Title |
|---|
| JP特开平5-813207A 1983.08.06 |
| 万为胜.石灰改良膨胀土路基施工技术.《商品与质量》.2010,(第S4期),全文. * |
| 刘林,刘坤岩.膨胀土改良机理及改良剂对比试验研究.《公路工程》.2011,第36卷(第1期),全文. * |
| 李进.膨胀土改良的室内试验研究及地基胀缩变形分析.《工程科技II辑》.2006,全文. * |
| 郭爱国,孔令伟,胡明鉴,王庆,郭刚.石灰稳定均匀级配砾石土的路用性能试验研究.《岩石力学与工程学报》.2005,第24卷全文. * |
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