CN114737558A - Soft soil shallow layer holding force hard shell layer construction method - Google Patents
Soft soil shallow layer holding force hard shell layer construction method Download PDFInfo
- Publication number
- CN114737558A CN114737558A CN202210360455.9A CN202210360455A CN114737558A CN 114737558 A CN114737558 A CN 114737558A CN 202210360455 A CN202210360455 A CN 202210360455A CN 114737558 A CN114737558 A CN 114737558A
- Authority
- CN
- China
- Prior art keywords
- soft soil
- hard shell
- shallow
- quicklime
- layer
- 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.)
- Pending
Links
Images
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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a construction method of a soft soil shallow holding force hard shell layer, and belongs to the problems of improvement and treatment of special soil in the engineering fields of civil engineering, water conservancy and traffic and the like. Hydrophobic gas-phase nano-silica and quicklime are uniformly mixed according to a certain proportion and then are doped into soft soil in a mode of shallow stirring and uniform spraying so as to achieve the improvement effect. The quicklime and the water in the soft soil react chemically to generate a calcareous combination with higher strength. Meanwhile, the hydrophobic gas-phase nano silicon dioxide is dispersed in the soft soil, so that external water can be effectively prevented from permeating into the soil body. Finally, a soft soil shallow layer bearing hard shell layer with strong hydrophobicity and high strength is formed, and the engineering property of the soft soil is greatly improved. The invention has the advantages of simple material selection and preparation process, no need of special environment in the whole construction process, simple and convenient construction operation, good effect after treatment and capability of meeting the engineering requirements of soft soil areas.
Description
Technical Field
The invention relates to a construction method of a soft soil shallow holding force hard shell layer, and belongs to the problems of improvement and treatment of special soil in the engineering fields of civil engineering, water conservancy and traffic and the like.
Background
With the increasing mass of civil and hydraulic traffic engineering, the soft soil problem is more common and complicated. The existing treatment method does not consider that the treatment effect is reduced due to the fact that external water permeates into soft soil under the long-term action, the engineering property is poor, normal operation of engineering is influenced, and even safety accidents are caused. If a technical method can be adopted, a strong hydrophobic and high-strength holding hard shell layer is formed in a certain thickness of a shallow layer of soft soil, namely a layer of material similar to a bamboo raft is laid on the surface of the soft soil, so that the influence of rainfall infiltration and underground water level can be isolated, the bearing capacity of the soft soil can be exerted for a long time, the use of other building materials is reduced, the engineering cost is saved, the engineering construction requirement is met, and the application prospect is wide.
Disclosure of Invention
The invention aims to provide a construction method of a soft soil shallow holding hard shell layer, aiming at the problems of complex construction, various materials, high cost and the like of the traditional soft soil foundation treatment. According to the method, quicklime and water in the soft soil are subjected to chemical reaction to quickly absorb part of water to generate a calcium combination with high strength, so that the mechanical property of the soft soil is improved; meanwhile, the strong hydrophobicity of hydrophobic gas-phase nano-silica (hydrophobic silica for short) is utilized to prevent external moisture from entering soft soil, so that the impermeability of the soft soil is improved. Finally forming a soft soil shallow layer bearing hard shell layer with 'strong hydrophobicity and high strength'.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a soft soil shallow holding force hard shell layer construction method is characterized by comprising the following steps:
(1) determining a soft soil treatment range according to the actual engineering requirements, and determining the soft soil treatment thickness in an important manner;
(2) determining the dosage of quicklime according to the optimal moisture content of the soft soil and the critical moisture content corresponding to the compaction degree based on the engineering requirement and by referring to the quicklime treatment soft soil standard and the engineering requirement; the quicklime dosage is the critical water content corresponding to the compaction degree based on engineering requirements or the optimal water content of the soft soil;
(3) mixing hydrophobic silica and quicklime uniformly according to a proportion, wherein the content of the hydrophobic silica is not lower than 0.8%;
(4) adopting a shallow layer stirring and uniform spraying construction process, placing a mixture of hydrophobic silica and quicklime in a shallow layer of soft soil, fully performing chemical reaction on the quicklime, and uniformly dispersing the hydrophobic silica in the shallow layer of the soft soil;
(5) after the moisture in the soft soil is obviously reduced and meets the engineering requirements, a fine sand layer is uniformly paved on the surface layer of the soft soil to form a soft soil shallow layer holding hard shell layer with strong hydrophobicity and high strength.
Further, in the step (1), the soft soil treatment thickness is determined according to actual engineering requirements, and the supporting crust layer formed after treatment can meet the regulations of the current foundation treatment specifications.
Further, in the step (2), the raw stone adopts grade III and above standards, and the common dosage of quicklime is 4-10%.
Further, in the step (3), the hydrophobic silica is treated by adopting a silane coupling agent as a surfactant, and the apparent contact angle of the treated hydrophobic silica particles is not less than 90o(ii) a The specific surface area of the particles is more than or equal to 200m2G, mass density is more than or equal to 2g/cm3The crystal form of the particles is spherical.
Furthermore, in the step (5), the water content is remarkably reduced mainly through the fact that no water is accumulated on the surface of the soft soil, the soft soil is in a plastic form, and the water content and the liquid plastic limit of the soft soil are measured through sampling, and mechanical and osmotic tests are carried out to determine whether the bearing hard shell layer meets the engineering requirements or not.
Further, in the step (5), the thickness of the fine sand layer is not less than 2 cm.
Compared with the prior art, the method has the following beneficial effects:
1) the selected materials are simple, low in price and ecological and environment-friendly;
2) the impermeability and the strength of the holding hard shell layer can be kept stable for a long time, and the adaptability is strong;
3) the construction method and the construction equipment of the holding hard shell layer are conventional, the field construction progress is not influenced, and the construction cost is reduced.
Drawings
FIG. 1 is a construction process of a soft soil shallow holding force hard shell layer;
FIG. 2 is a structural diagram of a soft soil shallow holding hard shell layer;
in the figure: 1. a natural soft soil layer, 2 a holding hard shell layer, 3 a fine sand layer.
Detailed Description
Calcium binding bodies with higher strength are generated by the chemical reaction of quicklime and water in the soft soil; the strong hydrophobic property of the hydrophobic gas-phase nano-silica prevents external moisture from entering soft soil, and finally a soft soil shallow holding hard shell layer with strong hydrophobicity and high strength is formed, as shown in figure 2, the bottom is a natural soft soil layer 1, the middle is a holding hard shell layer 2, and the top is a fine sand layer 3.
According to the principle, the following implementation steps are designed according to the method flow shown in the attached figure 1:
(1) determining a soft soil treatment range according to the actual engineering requirements, and determining the soft soil treatment thickness in an important way;
(2) and determining the dosage of quicklime according to the optimal moisture content of the soft soil and the critical moisture content corresponding to the compaction degree based on the engineering requirement and by referring to the quicklime treatment soft soil standard and the engineering requirement.
(3) Mixing hydrophobic gas-phase nano-silica and quicklime uniformly according to a certain proportion, wherein the content of the hydrophobic silica is not lower than 0.8%;
(4) the method comprises the following steps of (1) placing a mixture of hydrophobic silica and quicklime in a shallow soft soil layer by adopting a construction process of 'shallow stirring and uniform spraying', wherein the quicklime is subjected to a chemical reaction fully, and the hydrophobic silica is uniformly dispersed in the shallow soft soil layer;
(5) after the water content of the improved soft soil is obviously reduced and the performance meets the engineering requirement, a fine sand layer with a certain thickness is uniformly paved on the surface layer of the soft soil to form a soft soil shallow layer holding hard shell layer with strong hydrophobicity and high strength.
In the step (1), the soft soil is in accordance with the national standard of the existing Classification Standard of engineering of soil. The soft soil treatment thickness is flexibly determined according to the actual engineering requirements, and the bearing crust layer formed after the treatment can meet the regulations of the current foundation treatment specifications.
In the step (2), the optimal water content of the soft soil and the critical water content corresponding to the degree of compaction based on engineering requirements are determined, and the relevant regulations of the existing road soil engineering test regulations are required to be met.
In the step (2), the quicklime meets the requirements of grade III and above specified in the current technical Specification for constructing the road base course. The quicklime dosage is a critical water content corresponding to the compaction degree based on engineering requirements or the water content of the soft soil can be reduced to the optimal water content, the common dosage is 4-10%, the specific dosage can be determined by a mechanical property test of the treated soil body, and the property of the treated soil body can meet the engineering requirements.
In the step (3), the main parameters of the hydrophobic silica are as follows: the average particle size of the particles is less than or equal to 20 nm; the apparent contact angle of the particles treated by the surface active agents such as silane coupling agent is more than or equal to 90oAnd the larger the better; the specific surface area of the particles is more than or equal to 200m2G, mass density is more than or equal to 2g/cm3The crystal form of the particles is spherical.
In the step (5), the water content is remarkably reduced mainly by the fact that no water is accumulated on the surface of the soft soil, and the soft soil is in a plastic form. The water content and the liquid plastic limit of the hard shell can be measured by sampling, and whether the hard shell meets the engineering requirement or not can be determined by carrying out mechanical and osmotic tests and the like. The test method can refer to the standards of the current test regulations for inorganic binder stabilizing materials of highway engineering, the road soil engineering test regulations and the like.
And (5) paving a fine sand layer with a certain thickness to protect the stable form of the surface soft soil, avoid the interference of external factors and simultaneously improve the mechanical property of the surface soft soil. The thickness can be flexibly determined according to engineering requirements and is generally not less than 2 cm.
Table 1 shows the comparison of basic parameters of soft soil before and after treatment:
TABLE 1 comparison of basic parameters of Soft soil before and after treatment
Therefore, the treated soft soil can form a soft soil shallow layer bearing hard shell layer with strong hydrophobicity and high strength.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the concept of the present invention, and these modifications and decorations are also regarded as the protection scope of the present invention.
Claims (6)
1. A soft soil shallow holding force hard shell layer construction method is characterized by comprising the following steps:
(1) determining a soft soil treatment range according to the actual engineering requirements, and determining the soft soil treatment thickness in an important manner;
(2) determining the dosage of quicklime according to the optimal moisture content of the soft soil and the critical moisture content corresponding to the compaction degree based on the engineering requirement and by referring to the quicklime treatment soft soil standard and the engineering requirement; the quicklime dosage is the critical water content corresponding to the compaction degree based on engineering requirements or the optimal water content of the soft soil;
(3) mixing hydrophobic silica and quicklime uniformly according to a proportion, wherein the content of the hydrophobic silica is not lower than 0.8%;
(4) adopting a shallow layer stirring and uniform spraying construction process, placing a mixture of hydrophobic silica and quicklime in a shallow layer of soft soil, fully performing chemical reaction on the quicklime, and uniformly dispersing the hydrophobic silica in the shallow layer of the soft soil;
(5) after the moisture in the soft soil is obviously reduced and meets the engineering requirements, a fine sand layer is uniformly paved on the surface layer of the soft soil to form a soft soil shallow layer holding hard shell layer with strong hydrophobicity and high strength.
2. The construction method of the soft soil shallow holding force hard shell layer according to claim 1, characterized in that: in the step (1), the soft soil treatment thickness is determined according to the actual engineering requirements, and the bearing crust layer formed after treatment can meet the regulations of the current foundation treatment specifications.
3. The construction method of the soft soil shallow holding hard shell layer according to claim 1, characterized in that: in the step (2), the raw stone adopts a grade III standard or above, and the common dosage of the quicklime is 4-10%.
4. The construction method of the soft soil shallow holding force hard shell layer according to claim 1, characterized in that: in the step (3), the hydrophobic silica is treated by adopting a silane coupling agent as a surfactant, and the apparent contact angle of the treated hydrophobic silica particles is more than or equal to 90o(ii) a The specific surface area of the particles is more than or equal to 200m2G, mass density is more than or equal to 2g/cm3The crystal form of the particles is spherical.
5. The construction method of the soft soil shallow holding force hard shell layer according to claim 1, characterized in that: in the step (5), the water content is remarkably reduced mainly by the fact that no water is accumulated on the surface of the soft soil, the soft soil is in a plastic form, and the water content and the liquid plastic limit of the soft soil are measured by sampling, and mechanical and osmotic tests are carried out to determine whether the supporting hard shell layer meets the engineering requirements.
6. The construction method of the soft soil shallow holding force hard shell layer according to claim 1, characterized in that: in the step (5), the thickness of the fine sand layer is not less than 2 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210360455.9A CN114737558A (en) | 2022-04-07 | 2022-04-07 | Soft soil shallow layer holding force hard shell layer construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210360455.9A CN114737558A (en) | 2022-04-07 | 2022-04-07 | Soft soil shallow layer holding force hard shell layer construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114737558A true CN114737558A (en) | 2022-07-12 |
Family
ID=82280285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210360455.9A Pending CN114737558A (en) | 2022-04-07 | 2022-04-07 | Soft soil shallow layer holding force hard shell layer construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114737558A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1067086A (en) * | 1992-04-17 | 1992-12-16 | 山东省寿光县第二建筑工程公司 | Two-lime-sand pile for reinforcing soft foundation and manufacturing method thereof |
| CN1363640A (en) * | 2002-02-05 | 2002-08-14 | 上海交通大学 | Composite water-stopping isolating agent |
| CN102477751A (en) * | 2010-11-22 | 2012-05-30 | 大连创达技术交易市场有限公司 | Novel waterproof isolator |
| WO2015037249A1 (en) * | 2013-09-12 | 2015-03-19 | Oya Yohei | Civil engineering improvement method and modifying paper powder material |
| CN112980401A (en) * | 2019-12-02 | 2021-06-18 | 中国石油化工股份有限公司 | Hydrophobic nano silicon dioxide and preparation method and application thereof |
| CN113214835A (en) * | 2021-06-16 | 2021-08-06 | 中国电建集团华东勘测设计研究院有限公司 | Soil curing agent for roadbed filling |
-
2022
- 2022-04-07 CN CN202210360455.9A patent/CN114737558A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1067086A (en) * | 1992-04-17 | 1992-12-16 | 山东省寿光县第二建筑工程公司 | Two-lime-sand pile for reinforcing soft foundation and manufacturing method thereof |
| CN1363640A (en) * | 2002-02-05 | 2002-08-14 | 上海交通大学 | Composite water-stopping isolating agent |
| CN102477751A (en) * | 2010-11-22 | 2012-05-30 | 大连创达技术交易市场有限公司 | Novel waterproof isolator |
| WO2015037249A1 (en) * | 2013-09-12 | 2015-03-19 | Oya Yohei | Civil engineering improvement method and modifying paper powder material |
| CN112980401A (en) * | 2019-12-02 | 2021-06-18 | 中国石油化工股份有限公司 | Hydrophobic nano silicon dioxide and preparation method and application thereof |
| CN113214835A (en) * | 2021-06-16 | 2021-08-06 | 中国电建集团华东勘测设计研究院有限公司 | Soil curing agent for roadbed filling |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101081981B (en) | Muck soil composite curing agent | |
| CN107140902B (en) | A kind of permeable foam concrete and preparation method thereof | |
| CN110593036B (en) | Method for preparing roadbed filler by utilizing high-water-content engineering waste soil | |
| CN102060428A (en) | Silt curing agent and preparation method thereof | |
| CN107973548A (en) | A kind of high anti-freezing pervious concrete additive and preparation method thereof | |
| CN105602571B (en) | A kind of polymer soil-solidified-agent | |
| CN108424020A (en) | A kind of method for modifying super hydrophobicity of mineral admixture | |
| CN104514217B (en) | Expansive soil foundation modifying agent and improvement construction method | |
| CN107117916A (en) | A kind of powder soil solidification additive for roadbase | |
| CN102093898A (en) | Composite soil stabilizer | |
| CN113461380A (en) | Plastic concrete for vertical antifouling barrier | |
| CN102249581A (en) | Method for improving expansive soil by carbide slag and construction method | |
| Yao et al. | Effect of freeze-thaw cycle on shear strength of lime-solidified dispersion soils | |
| WO2016167452A1 (en) | Powder waterproofing admixture, method for preparing same, and construction method using same | |
| JI et al. | Experimental study of dispersive clay modified by calcium lignosulfonate | |
| CN111620630B (en) | Super-long underwater pile foundation machine-made sand self-compacting concrete and preparation method thereof | |
| CN111848057B (en) | Self-compacting concrete for super-long underwater pile foundation and preparation method thereof | |
| CN110922136B (en) | Water permeable brick prepared from dredged mud and preparation method thereof | |
| CN114737558A (en) | Soft soil shallow layer holding force hard shell layer construction method | |
| CN117229013A (en) | Excavation silt solidified soil, preparation method and application | |
| CN108384554B (en) | Environment-friendly improved loess with loess foundation liquefaction resistance and preparation method thereof | |
| CN116789389A (en) | Phosphogypsum curing agent based on cement-based material and cement-based roadbed material adopting phosphogypsum curing agent | |
| CN110282936A (en) | A kind of high property spray concrete and mixing method | |
| CN109293294A (en) | A kind of side slope deep layer gutter enhancement eco-concrete | |
| CN112812780B (en) | Hydrophobic anti-scouring loess curing agent |
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 |