CN111172967A - Modified loess and preparation method, construction method and application thereof - Google Patents
Modified loess and preparation method, construction method and application thereof Download PDFInfo
- Publication number
- CN111172967A CN111172967A CN202010026242.3A CN202010026242A CN111172967A CN 111172967 A CN111172967 A CN 111172967A CN 202010026242 A CN202010026242 A CN 202010026242A CN 111172967 A CN111172967 A CN 111172967A
- Authority
- CN
- China
- Prior art keywords
- loess
- improved
- carbide slag
- mass
- soil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- 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
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/12—Water-soluble silicates, e.g. waterglass
-
- 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
Abstract
The invention relates to improved loess as well as a preparation method, a construction method and application thereof, wherein the improved loess comprises 4-8% by mass of carbide slag, 4-8% by mass of water glass and 84-92% by mass of loess of a soil body to be improved, and the improved loess is formed by uniformly mixing the carbide slag, the water glass and the loess. The invention provides the method for improving the loess foundation by mixing the carbide slag and the water glass, the improved foundation has the advantages of high strength, small deformation, high water stability, lower brittleness and obviously reduced coefficient of collapsibility, the utilization efficiency of the carbide slag is improved, and the problems of land resource occupation and environment pollution caused by stacking a large amount of the carbide slag are solved.
Description
Technical Field
The invention belongs to the technical field of foundations, and particularly relates to improved loess as well as a preparation method, a construction method and application thereof.
Background
Loess is a special soil body with large pores and weak cementation, and is a quaternary continental phase sediment with a loose structure. In China, the distribution areas of loess mainly include northwest areas and northwest areas, and the distribution of loess in Gansu, Shaanxi, Shanxi, Ningxia and other areas in the middle and upstream of the yellow river is particularly wide. Loess is a typical 'problem soil' in engineering application, and when engineering construction is carried out in a loess area, disasters such as settlement by collapse, deformation and cracking, foundation instability, shallow layer collapse and the like caused by loess frequently occur, so that the safe operation of the engineering is seriously threatened. Therefore, in the loess treatment process, the loess needs to be improved to achieve the desired properties.
Currently, the common methods for modifying loess are conventional curing agent modification and novel curing agent modification. Because the traditional curing agent improvement method has the advantages of convenient material acquisition, simple operation and low cost, the method is the first mode for improving the loess in the engineering construction of loess areas.
The utilization of industrial waste as soil improvement material is a new direction of soil improvement research in recent years. The soil improved by the industrial solid waste has high strength and strong deformation resistance, not only solves the problems of random stacking and environmental pollution of the industrial solid waste, but also reduces the improvement cost and is generally accepted by the engineering industry. Therefore, it is necessary to improve the loess foundation by using industrial wastes as a modifier.
Disclosure of Invention
In order to solve the problems, the invention provides improved loess as well as a preparation method, a construction method and application thereof, which can effectively solve the problem of roadbed damage caused by the expansion and contraction deformation of the loess and improve the strength of the loess and are easy to popularize.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a modified loess comprises 4-8% by mass of carbide slag, 4-8% by mass of water glass and 84-92% by mass of loess of a soil body to be modified, wherein the modified loess is formed by uniformly mixing the carbide slag, the water glass and the loess.
In the technical scheme, further, the analysis result of the carbide slag comprises the following components in percentage by mass of the oxides obtained after analysis and detection: 64.38-70.21% of calcium oxide, 1.89-4.75% of silicon dioxide, 2.02-4.39% of aluminum oxide and 0.12-1.88% of magnesium oxide.
Further, the method for preparing the modified loess comprises the following steps:
(1) weighing 4-8% of carbide slag, 4-6% of water glass and 86-92% of loess of a soil body to be improved according to the mass percentage, and uniformly mixing;
(2) and (3) performing compaction test on the loess in the engineering area, wherein the compaction test method is performed according to 'geotechnical test method standard' GB/T50123-1999, so as to obtain the optimal water content of the loess in the engineering area.
(3) Adding water into the mixed loess obtained in the step (1) according to the determined water content with the optimal water content, uniformly stirring, sealing and standing for 24 hours to obtain the improved loess.
Further, the construction method of the improved loess includes the following steps:
(1) conveying the improved loess to a field, performing layered filling, and performing static pressure on each layer of engineering soil filler by a heavy soil compactor after filling;
(2) and after the engineering soil filler is filled in a layered manner, carrying out mechanical vibration rolling, and then carrying out fine leveling treatment to form the improved loess foundation.
Further, in the step (1), the modified loess is layered and piled up with a layer depth of 20 cm.
Further, the modified loess is applied to the field of engineering soil filling.
Advantageous effects
The invention provides the method for improving the loess foundation by mixing the carbide slag and the water glass, the improved foundation has the advantages of high strength, small deformation, high water stability, lower brittleness and obviously reduced coefficient of collapsibility, the utilization efficiency of the carbide slag is improved, and the problems of land resource occupation and environment pollution caused by stacking a large amount of the carbide slag are solved.
The improvement principle of the improved loess in the technical scheme is as follows
After the carbide slag is doped into the soil body, the carbide slag and water in the soil body are subjected to digestion to generate free Ca2+，Ca2+And low price K+、Na+Replacement is carried out to thin the electric double layer of the soil particles, the particles are close to each other and generate a gluing effect, and in addition, the calcium carbide slag and the soil body generate a pozzolanic effect and an ion exchange reaction, Ca (OH)2·nH2The O crystals generate a bonding effect to enable the soil particles to generate cementation; after the calcium carbide slag and the water glass are mixed and doped, calcium silicate hydrate gel is generated through reaction of the calcium carbide slag and the water glass, the calcium silicate hydrate gel is automatically dehydrated to obtain calcium silicate hydrate solid, and the strength, deformation and water stability characteristics of a soil body are obviously improved in the process; meanwhile, the carbide slag particles are fine, and after the carbide slag particles are doped into loess, the carbide slag particles which cannot participate in the reaction are filled in the middle of the soil particles, so that the grading of the soil particles is improved, and the structure of the improved soil is more compact. Meanwhile, carbide slag particles are contacted with soil particles, so that the occlusal force among the particles is increased, and the deformation of the soil body under the action of external force is resisted to a certain extent.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
the foundation engineering of a certain loess coverage area is characterized in that the length of the foundation is 20 meters, the width of the foundation is 15 meters, and the depth of the soil layer for foundation treatment is 2 meters. The modified loess, the preparation method and the construction method provided by the invention are adopted to treat the foundation, and the concrete treatment steps are as follows:
(1) performing compaction test on the loess of the foundation engineering area according to geotechnical test method standard (GB/T50123-1999) to obtain the optimal moisture content of the loess of the engineering area of 16.4%;
(2) the modified loess comprises 6% by mass of carbide slag, 4% by mass of water glass and 90% by mass of loess of a soil body to be modified, and the mass of the loess to be modified in the engineering area is 885600kg, the mass of the loess to be doped with the carbide slag is 59040kg and the mass of the loess to be doped with the water glass is 39360kg according to the proportion;
(3) mechanically mixing the loess, the carbide slag and the water glass in the step (2), slowly sprinkling water in the mixing process until the water content of the mixed soil reaches the optimal water content state in the first step, and sealing and placing for 24 hours to form improved loess;
(4) transporting the modified loess obtained in the step (3) to a target site, performing engineering soil layered filling with a depth of 20cm, and performing static pressure on a heavy soil compactor after each layer of engineering soil filler is filled;
(5) and after the engineering soil filler is piled and filled in layers, carrying out mechanical vibration rolling, and carrying out fine leveling treatment after rolling to ensure that the surface of the foundation is smooth.
The loess foundation treated by the method of the embodiment is subjected to a compression test and an unconfined compressive strength test, so that the compression property and the compressive strength change characteristics of the improved foundation are tested. Table 1 shows the test results of the untreated foundation loess sample, the foundation loess sample treated by the method of example 1, and the comparative examples.
TABLE 1 test results
As can be seen from Table 1, the effect of only adding carbide slag is far less than that of only adding water glass to improve loess, because calcium silicate hydrate gel is generated by the reaction of the carbide slag and the water glass after the carbide slag and the water glass are added, the calcium silicate hydrate gel is automatically dehydrated, and the strength of soil body is further improved by the obtained calcium silicate hydrate solid. Compared with untreated loess, the loess treated by the method has the advantages that the initial pore ratio, the compression coefficient, the volume compression coefficient and the compression index are all reduced, the compression modulus and the unconfined compressive strength are increased, and the foundation loess treated by the method reaches the standard of low compressibility soil according to the basic design code of building foundation (GB 50007-2011).
Example 2:
the foundation engineering of a certain loess coverage area is 22 meters long and 12 meters wide, and the depth of the foundation treatment soil layer is 2.5 meters. The modified loess, the preparation method and the construction method provided by the invention are adopted to treat the foundation, and the concrete treatment steps are as follows:
(1) performing compaction test on the loess of the foundation engineering area according to geotechnical test method standard (GB/T50123-1999) to obtain the optimal moisture content of the loess of the engineering area of 18.2%;
(2) the modified loess comprises 8% by mass of carbide slag, 4% by mass of water glass and 88% by mass of loess of a soil body to be modified, the mass of the loess to be modified in the engineering area is 1057000kg, the mass of the carbide slag to be doped is 96096kg and the mass of the water glass to be doped is 48048kg according to the proportion;
(3) mechanically mixing the loess, the carbide slag and the water glass in the step (2), slowly sprinkling water in the mixing process until the water content of the mixed soil reaches the optimal water content state in the first step, and sealing and placing for 24 hours to form improved loess;
(4) transporting the modified loess obtained in the step (3) to a target site, performing engineering soil layered filling with a depth of 20cm, and performing static pressure on a heavy soil compactor after each layer of engineering soil filler is filled;
(5) and after the engineering soil filler is piled and filled in layers, carrying out mechanical vibration rolling, and carrying out fine leveling treatment after rolling to ensure that the surface of the foundation is smooth.
The loess foundation treated by the method of the embodiment is subjected to a compression test and an unconfined compressive strength test, so that the compression property and the compressive strength change characteristics of the improved foundation are tested. Table 2 shows the test results of the untreated foundation loess sample and the foundation loess sample treated by the method of example 2.
TABLE 2 test results
As can be seen from table 2, the loess treated by the method of the present invention has a reduced initial pore ratio, a reduced compression coefficient, a reduced volume compression coefficient and a reduced compression index, and an increased compressive modulus and unconfined compressive strength, as compared with the modified loess of carbide slag and water glass, and the loess treated foundation by the method of the present invention has reached the standard of low compressibility soil according to the design code of foundation of building foundation (GB 50007-2011).
Example 3:
the foundation engineering of a certain loess coverage area is that the foundation is 25 meters long and 15 meters wide, and the depth of the foundation treatment soil layer is 2 meters. The modified loess, the preparation method and the construction method provided by the invention are adopted to treat the foundation, and the concrete treatment steps are as follows:
(1) performing compaction test on the loess of the foundation engineering area according to geotechnical test method standard (GB/T50123-1999) to obtain the optimal moisture content of the loess of the engineering area of 17.5%;
(2) the modified loess comprises 4% by mass of carbide slag, 4% by mass of water glass and 92% by mass of loess of a soil body to be modified, the mass of the loess to be modified in the engineering area is about 1181250kg, the mass of the carbide slag to be doped is 52500kg and the mass of the water glass to be doped is 52500kg according to the proportion;
(3) mechanically mixing the loess, the carbide slag and the water glass in the step (2), slowly sprinkling water in the mixing process until the water content of the mixed soil reaches the optimal water content state in the first step, and sealing and placing for 24 hours to form improved loess;
(4) transporting the modified loess obtained in the step (3) to a target site, performing engineering soil layered filling with a depth of 20cm, and performing static pressure on a heavy soil compactor after each layer of engineering soil filler is filled;
(5) and after the engineering soil filler is piled and filled in layers, carrying out mechanical vibration rolling, and carrying out fine leveling treatment after rolling to ensure that the surface of the foundation is smooth.
The loess foundation treated by the method of the embodiment is subjected to a compression test and an unconfined compressive strength test, so that the compression property and the compressive strength change characteristics of the improved foundation are tested. Table 3 shows the test results of the untreated foundation loess sample and the foundation loess sample treated by the method of example 3.
TABLE 3 test results
As can be seen from table 3, the loess treated by the method of the present invention has a reduced initial pore ratio, a reduced compression coefficient, a reduced volume compression coefficient and a reduced compression index, and an increased compressive modulus and unconfined compressive strength, as compared with the modified loess of carbide slag and water glass, and the loess treated foundation by the method of the present invention has reached the standard of low compressibility soil according to the design code of foundation of building foundation (GB 50007-2011).
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. The improved loess is characterized by comprising 4-8% by mass of carbide slag, 4-8% by mass of water glass and 84-92% by mass of loess of a soil body to be improved, wherein the sum of the mass percentages of the carbide slag, the water glass and the loess of the soil body to be improved is 100%, and the improved loess is formed by uniformly mixing the carbide slag, the water glass and the loess.
2. The modified loess according to claim 1, wherein the carbide slag is analyzed to give an analysis result in which, in terms of mass percentages of oxides obtained after the analysis and detection: 64.38-70.21% of calcium oxide, 1.89-4.75% of silicon dioxide, 2.02-4.39% of aluminum oxide and 0.12-1.88% of magnesium oxide.
3. The method of producing modified loess according to any one of claims 1 to 2, comprising the steps of:
(1) weighing 4-8% of carbide slag, 4-6% of water glass and 86-92% of loess of a soil body to be improved according to the mass percentage, and uniformly mixing;
(2) performing compaction test on the loess in the engineering area, wherein the compaction test method is performed according to 'geotechnical test method standard' GB/T50123-1999, so as to obtain the optimal water content of the loess in the engineering area;
(3) adding water into the mixed loess obtained in the step (1) according to the determined water content with the optimal water content, uniformly stirring, sealing and standing for 24 hours to obtain the improved loess.
4. The construction method of modified loess according to any one of claims 1 to 2, comprising the steps of:
(1) conveying the improved loess to a field, performing layered filling, and performing static pressure on each layer of engineering soil filler by a heavy soil compactor after filling;
(2) and after the engineering soil filler is filled in a layered manner, carrying out mechanical vibration rolling, and then carrying out fine leveling treatment to form the improved loess foundation.
5. The method of constructing modified loess according to claim 4, wherein the modified loess is piled up in layers at a depth of 20cm in the step (1).
6. Use of the modified loess as set forth in any one of claims 1 to 2 in the field of engineered soil filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010026242.3A CN111172967B (en) | 2020-01-10 | 2020-01-10 | Modified loess and preparation method, construction method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010026242.3A CN111172967B (en) | 2020-01-10 | 2020-01-10 | Modified loess and preparation method, construction method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111172967A true CN111172967A (en) | 2020-05-19 |
| CN111172967B CN111172967B (en) | 2021-04-06 |
Family
ID=70658104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010026242.3A Active CN111172967B (en) | 2020-01-10 | 2020-01-10 | Modified loess and preparation method, construction method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111172967B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114149233A (en) * | 2021-12-07 | 2022-03-08 | 国网新源控股有限公司 | Environment-friendly improved soil and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002307050A (en) * | 2001-01-25 | 2002-10-22 | Sc:Kk | Method of treating and reutilizing soil containing heavy metals, and heavy metal ellution reducing material |
| CN102173693A (en) * | 2011-03-25 | 2011-09-07 | 湖南宏禹水利水电岩土工程有限公司 | Clay slurry curing agent |
| CN102249581A (en) * | 2011-05-17 | 2011-11-23 | 河海大学 | Method for improving expansive soil by carbide slag and construction method |
| CN103184733A (en) * | 2011-12-27 | 2013-07-03 | 河海大学 | Method for improving expansive soil and construction method thereof |
-
2020
- 2020-01-10 CN CN202010026242.3A patent/CN111172967B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002307050A (en) * | 2001-01-25 | 2002-10-22 | Sc:Kk | Method of treating and reutilizing soil containing heavy metals, and heavy metal ellution reducing material |
| CN102173693A (en) * | 2011-03-25 | 2011-09-07 | 湖南宏禹水利水电岩土工程有限公司 | Clay slurry curing agent |
| CN102249581A (en) * | 2011-05-17 | 2011-11-23 | 河海大学 | Method for improving expansive soil by carbide slag and construction method |
| CN103184733A (en) * | 2011-12-27 | 2013-07-03 | 河海大学 | Method for improving expansive soil and construction method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 杜延军等: "电石渣稳定过湿黏土路基填料路用性能现场试验研究", 《东南大学学报（自然科学版）》 * |
| 龚晓南: "《地基处理手册（第二版）》", 31 August 2000 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114149233A (en) * | 2021-12-07 | 2022-03-08 | 国网新源控股有限公司 | Environment-friendly improved soil and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111172967B (en) | 2021-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Pourakbar et al. | Model study of alkali-activated waste binder for soil stabilization | |
| CN110845212B (en) | Seepage erosion resistant concrete and preparation method thereof | |
| CN113307591B (en) | Multi-source solid waste composite high-flow-state backfill material and preparation method and application thereof | |
| CN108821690B (en) | Preparation method of MOF high-performance concrete with high strength and small shrinkage | |
| CN109369113B (en) | Collapsible loess reinforcing grouting slurry, preparation method and application thereof | |
| CN110590294A (en) | Regenerated powder concrete with good durability and preparation method thereof | |
| Gu et al. | Effect of sodium silicate on the properties of loess stabilized with alkali-activated fly ash-based | |
| Li et al. | Engineering properties of loess stabilized by a type of eco-material, calcium lignosulfonate | |
| CN108395183A (en) | A kind of foundation treatment engineering mixed serum and preparation method thereof | |
| CN111172967B (en) | Modified loess and preparation method, construction method and application thereof | |
| CN103965918A (en) | Curing agent for water quenching manganese slag mollisol | |
| CN114163174B (en) | Solid waste base modified cementing material and application thereof | |
| CN112851247B (en) | Seawater corrosion resistant nano cement soil and preparation method thereof | |
| Cui et al. | Steel slag/precarbonated steel slag as a partial substitute for Portland cement: Effect on the mechanical properties and microstructure of stabilized soils | |
| Xiang et al. | Investigation on preparation and compressive strength model of steel slag foam concrete | |
| CN113816707A (en) | Curing agent, preparation method and application thereof, weathered argillaceous siltstone improved material and application thereof | |
| CN110451876B (en) | Self-repairing concrete with construction waste bricks as carriers and preparation method thereof | |
| Zhou et al. | Bearing capacity and settlement of weak fly ash ground improved using lime fly ash or stone columns | |
| CN108384554B (en) | Environment-friendly improved loess with loess foundation liquefaction resistance and preparation method thereof | |
| Ban et al. | Strength and electrical resistivity characteristic of carbonating reactive MgO-mixed red clay under different water contents | |
| Weng et al. | Mechanical behavior and strengthening mechanism of red clay solidified by xanthan gum biopolymer | |
| CN111518566A (en) | Composite modifier for preparing saline soil backfill | |
| Yang et al. | Strength properties, microstructural evolution, and reinforcement mechanism for cement-stabilized loess with silica micro powder | |
| CN115650631B (en) | Waterproof compacting agent for concrete and preparation method thereof | |
| Xu et al. | Influence of reactive magnesia content on loess solidification using biocarbonization of reactive magnesia |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |