阅读说明：本技术 一种非自重湿陷性黄土区域肥槽回填材料及回填方法 (Fertilizer groove backfill material and backfill method for non-self-weight collapsible loess area ) 是由 骆发江 田勇 田周 时广辉 孟锦 张泽坤 李俊 张波 马冲 李锋 胡金库 孙愿 于 2020-12-09 设计创作，主要内容包括：本发明涉及一种非自重湿陷性黄土区域肥槽回填材料及回填方法。回填材料包括以下质量配比的原料：黄土65—74份、水泥3—20份、粉煤灰2—5份、分散剂1—5份、超细粉5—8份和水15—25份。本发明可实现自密实、固化黄土,其强度、体积稳定性和渗透性好,保证了肥槽回填的密实性,建筑物的安全性以及适用性和耐久性。(The invention relates to a fertilizer tank backfill material and a backfill method for a non-self-weight collapsible loess area. The backfill material comprises the following raw materials in percentage by mass: 65-74 parts of loess, 3-20 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of ultrafine powder and 15-25 parts of water. The invention can realize self-compaction and loess solidification, has good strength, volume stability and permeability, and ensures the compactness of the fertilizer tank backfill, the safety, the applicability and the durability of the building.)

1. The utility model provides a regional fertile groove backfill material of non-dead weight collapsible loess which characterized in that: the backfill material comprises the following raw materials in parts by mass: 65-74 parts of loess, 3-20 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of ultrafine powder and 15-25 parts of water.

2. The non-self-weight collapsible loess area manure pit backfill material as claimed in claim 1, wherein: the backfill material comprises the following raw materials in parts by mass: 65 parts of loess, 12-20 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of superfine powder and 15-25 parts of water.

3. The non-self-weight collapsible loess area manure pit backfill material as claimed in claim 1, wherein: the backfill material comprises the following raw materials in parts by mass: 74 parts of loess, 3-5 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of ultrafine powder and 15-25 parts of water.

4. The non-self-weight collapsible loess area trench backfill material according to any one of claims 1 to 3, wherein: the cement is as follows: the mass ratio of the fly ash satisfies 1: 0.3-0.6.

5. The non-self-weight collapsible loess area manure pit backfill material as claimed in claim 4, wherein: the dispersant is phosphate ethyl ester or calcium lignosulfonate; the superfine powder is one of class I fly ash and fine particles.

6. A method for preparing the self-weight collapsible loess area manure pit backfill material as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following steps:

1) adding a dispersing agent and the ultrafine powder into a fixed container, introducing water with a corresponding ratio, and stirring uniformly to fully mix the dispersing agent and the ultrafine powder to form a mixed solution A;

2) adding cement and fly ash in a corresponding ratio into the mixed solution A in the step 1), and uniformly stirring to form a mixed solution B;

3) and adding loess in a corresponding ratio into the mixed solution B, and uniformly stirring to obtain the non-self-weight collapsible loess area fertilizer tank backfill material.

7. A fat trough backfilling method realized by using the non-self-weight collapsible loess area fat trough backfilling material in claim 1, characterized in that: the method comprises the following steps:

1) adding a dispersing agent and the ultrafine powder into a fixed container, introducing water with a corresponding ratio, and stirring uniformly to fully mix the dispersing agent and the ultrafine powder to form a mixed solution A;

2) adding cement and fly ash in a corresponding ratio into the mixed liquid A in the step 1) according to the collapsibility grade of the non-self-weight collapsible loess area, and uniformly stirring to form mixed liquid B;

3) adding loess with a corresponding ratio into the mixed solution B, and uniformly stirring to obtain a non-self-weight collapsible loess area fertilizer tank backfill material;

4) slowly pouring the backfill material of the fertilizer tank in the non-self-weight collapsible loess area into the fertilizer tank to fill the fertilizer tank, wherein the backfill material of the fertilizer tank in the non-self-weight collapsible loess area can be self-compacted to form solidified loess, and curing until the strength of the solidified loess reaches 0.2-0.4 MPa to finish the backfilling of the fertilizer tank.

8. The trench backfill method implemented by the trench backfill material in the non-self-weight collapsible loess area according to claim 7, characterized in that: when the collapsible grade in non-dead weight collapsible loess area is I level, step 2) is: adding 3-5 parts of cement and 2-5 parts of fly ash into the mixed solution A obtained in the step 1), and stirring for 0.8h until the mixture is uniformly mixed to form a mixed solution B;

the step 3) is as follows: adding 74 parts of loess into the mixed solution B, and stirring for 0.4h until uniformly mixing to prepare a non-self-weight collapsible loess area fertilizer tank backfill material;

the step 4) is as follows: slowly pouring the backfill material of the fertilizer tank in the non-self-weight collapsible loess area into the fertilizer tank to fill the fertilizer tank, wherein the backfill material of the fertilizer tank in the non-self-weight collapsible loess area can be self-compacted to form solidified loess, and curing for 10-15 days until the strength of the solidified loess reaches 0.2-0.4 MPa, thereby completing the backfill of the fertilizer tank.

9. The trench backfill method implemented by the self-weight collapsible loess area trench backfill material according to claim 7, wherein when the collapse grade of the non-self-weight collapsible loess area is level II, the step 2) comprises: adding 12-20 parts of cement and 2-5 parts of fly ash into the mixed solution A obtained in the step 1), and stirring for 1 hour until the mixture is uniformly mixed to form a mixed solution B;

the step 3) is as follows: adding 65 parts of loess into the mixed liquid B, and stirring for 0.5h to mix uniformly to prepare a non-self-weight collapsible loess area fertilizer tank backfill material;

the step 4) is as follows: slowly pouring the backfill material of the fertilizer tank in the non-self-weight collapsible loess area into the fertilizer tank to fill the fertilizer tank, wherein the backfill material of the fertilizer tank in the non-self-weight collapsible loess area can be self-compacted to form solidified loess, and curing for 15-20 days until the strength of the solidified loess reaches 0.2-0.4 MPa, thereby completing the backfill of the fertilizer tank.

Technical Field

The invention belongs to the technical field of civil construction materials, and particularly relates to a fertilizer tank backfill material and a backfill method for a non-self-weight collapsible loess area.

Background

The fertilizer groove is a part of foundation pit which is excavated for providing a building construction working surface, generally refers to a space between a foundation outer wall or a basement outer wall of a building and the edge of the foundation pit, and when the fertilizer groove is backfilled, the construction is difficult due to limited construction space, so the backfilling is difficult to achieve compactness.

At present, in the construction process of different projects, the construction requirements of the aspects of soil body reinforcement, soil body improvement and the like are often met:

1. the traditional foundation treatment usually adopts a deep stirring method, which is a foundation treatment measure for improving the original foundation strength by adding curing agents such as cement and the like into the original soil body and then carrying out forced stirring. Due to the lack of flow and operation space of in-situ mixing, mechanical equipment and other reasons, the method causes uneven mixing, so that the strength of the treated foundation soil is lower;

2. during groove backfill construction, pseudo-ginseng soil and twenty-eight soil are generally adopted for backfill treatment, and materials such as concrete can be adopted to directly replace soil, so that the problems of material waste, high manufacturing cost and complex construction process exist in the method.

The reason that the backfilling of the fertilizer groove is difficult to be densely backfilled in the current practical engineering is as follows:

1) the construction space is narrow; 2) the depth of the fertilizer groove is large; 3) the supporting structure interferes.

The engineering quality problem caused by the backfilling of the fertilizer tank is ubiquitous and is a difficult problem in the industry, so the problem needs to be combed, and an effective solution is provided. The problems of large one-time investment and high single-side cost of the existing premixed fluidized solidified soil are difficult to solve at one time due to the unique commercial operation mode.

Disclosure of Invention

In order to solve the technical problems existing in the fertilizer tank backfilling in the background technology, the invention provides a fertilizer tank backfilling material for a non-self-weight collapsible loess area, which can realize self-compaction and loess solidification, has good strength, volume stability and permeability, and ensures the compactness of the fertilizer tank backfilling, the safety, the applicability and the durability of a building.

Meanwhile, the invention also provides a fertilizer tank backfilling method realized by using the fertilizer tank backfilling material in the non-self-weight collapsible loess area.

The technical solution of the invention is as follows: the invention relates to a fertilizer tank backfill material for a non-self-weight collapsible loess area, which is characterized by comprising the following components in parts by weight: the backfill material comprises the following raw materials in parts by mass: 65-74 parts of loess, 3-20 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of ultrafine powder and 15-25 parts of water.

Preferably, the backfill material comprises the following raw materials in percentage by mass: 65 parts of loess, 12-20 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of superfine powder and 15-25 parts of water.

Preferably, the backfill material comprises the following raw materials in percentage by mass: 74 parts of loess, 3-5 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of ultrafine powder and 15-25 parts of water.

Preferably, the ratio of cement: the mass ratio of the fly ash satisfies 1: 0.3-0.6.

Preferably, the dispersant is phosphate ethyl ester or calcium lignosulfonate; the superfine powder is one of class I fly ash and fine particles.

The method for preparing the fertilizer tank backfill material in the non-self-weight collapsible loess area is characterized by comprising the following steps of: the method comprises the following steps:

1) adding a dispersing agent and the ultrafine powder into a fixed container, introducing water with a corresponding ratio, and stirring uniformly to fully mix the dispersing agent and the ultrafine powder to form a mixed solution A;

2) adding cement and fly ash in a corresponding ratio into the mixed solution A in the step 1), and uniformly stirring to form a mixed solution B;

3) and adding loess in a corresponding ratio into the mixed solution B, and uniformly stirring to obtain the non-self-weight collapsible loess area fertilizer tank backfill material.

A fertilizer tank backfilling method realized by the fertilizer tank backfilling material in the non-self-weight collapsible loess area is characterized in that: the method comprises the following steps:

1) adding a dispersing agent and the ultrafine powder into a fixed container, introducing water with a corresponding ratio, and stirring uniformly to fully mix the dispersing agent and the ultrafine powder to form a mixed solution A;

2) adding cement and fly ash in a corresponding ratio into the mixed liquid A in the step 1) according to the collapsibility grade of the non-self-weight collapsible loess area, and uniformly stirring to form mixed liquid B;

3) adding loess with a corresponding ratio into the mixed solution B, and uniformly stirring to obtain a non-self-weight collapsible loess area fertilizer tank backfill material;

4) slowly pouring the backfill material of the fertilizer tank in the non-self-weight collapsible loess area into the fertilizer tank to fill the fertilizer tank, wherein the backfill material of the fertilizer tank in the non-self-weight collapsible loess area can be self-compacted to form solidified loess, and curing until the strength of the solidified loess reaches 0.2-0.4 MPa to finish the backfilling of the fertilizer tank.

Preferably, when the collapsible grade of the non-self-weight collapsible loess area is grade i, the step 2) is: adding 3-5 parts of cement and 2-5 parts of fly ash into the mixed solution A obtained in the step 1), and stirring for 0.8h until the mixture is uniformly mixed to form a mixed solution B;

the step 3) is as follows: adding 74 parts of loess into the mixed solution B, and stirring for 0.4h until uniformly mixing to prepare a non-self-weight collapsible loess area fertilizer tank backfill material;

the step 4) is as follows: slowly pouring the backfill material of the fertilizer tank in the non-self-weight collapsible loess area into the fertilizer tank to fill the fertilizer tank, wherein the backfill material of the fertilizer tank in the non-self-weight collapsible loess area can be self-compacted to form solidified loess, and curing for 10-15 days until the strength of the solidified loess reaches 0.2-0.4 MPa, thereby completing the backfill of the fertilizer tank.

Preferably, when the collapsible grade of the non-self-weight collapsible loess area is level ii, the step 2) is: adding 12-20 parts of cement and 2-5 parts of fly ash into the mixed solution A obtained in the step 1), and stirring for 1 hour until the mixture is uniformly mixed to form a mixed solution B;

the step 3) is as follows: adding 65 parts of loess into the mixed liquid B, and stirring for 0.5h to mix uniformly to prepare a non-self-weight collapsible loess area fertilizer tank backfill material;

the step 4) is as follows: slowly pouring the backfill material of the fertilizer tank in the non-self-weight collapsible loess area into the fertilizer tank to fill the fertilizer tank, wherein the backfill material of the fertilizer tank in the non-self-weight collapsible loess area can be self-compacted to form solidified loess, and curing for 15-20 days until the strength of the solidified loess reaches 0.2-0.4 MPa, thereby completing the backfill of the fertilizer tank.

Compared with the prior art, the invention has the beneficial effects that:

1) the invention makes full use of loess resources, and prepares the fertilizer tank backfill material which has self-compaction performance and is suitable for the non-self-weight collapsible loess foundation by adding a proper amount of cement, fly ash and additives, and has the advantages of good self-compaction performance, high strength, good stability, good permeability and the like.

2) The invention mainly aims at the non-self-weight collapsible loess foundation, the proportion of materials can be adjusted according to the collapsible grade of the non-self-weight collapsible loess area, and further the strength, the volume stability and the permeability of the loess are adjusted, under the condition of ensuring stable structure and proper strength, the filler cost is reduced, and the building construction requirements are met.

3) According to the loess area backfill self-compacting material provided by the invention, water, cement, loess, fly ash and an additive are mixed according to a certain proportion, poured and hardened to form an integral block with certain strength, so that the problem that the backfilling of a fertilizer tank is difficult to compact in the current construction is effectively solved, and the loess area backfill self-compacting material has the characteristics of stable quality, cost saving, simple process and the like, and the compactness of the backfilling of the fertilizer tank, the safety, the applicability and the durability of a building are greatly improved.

Detailed Description

The fertilizer tank backfill material for the non-self-weight collapsible loess area comprises the following raw materials in parts by weight: 65-74 parts of loess, 3-20 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of ultrafine powder and 15-25 parts of water.

Further, the non-self-weight collapsible loess area fertilizer groove backfill material comprises the following raw materials in parts by weight: 65 parts of loess, 12-20 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of superfine powder and 15-25 parts of water.

Further, the non-self-weight collapsible loess area fertilizer groove backfill material comprises the following raw materials in parts by weight: 74 parts of loess, 3-5 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of ultrafine powder and 15-25 parts of water.

Wherein: cement: the mass ratio of the fly ash satisfies 1: 0.3-0.6.

The dispersant is phosphate ethyl ester or calcium lignosulfonate; the superfine powder is one of class I fly ash and fine particles.

The invention discloses a preparation method of a fertilizer tank backfill material in a non-self-weight collapsible loess area, which comprises the following steps of:

1) adding a dispersing agent and the ultrafine powder into a fixed container, introducing water with a corresponding ratio, and stirring uniformly to fully mix the dispersing agent and the ultrafine powder to form a mixed solution A;

2) adding cement and fly ash in a corresponding ratio into the mixed solution A in the step 1), and uniformly stirring to form a mixed solution B;

3) and adding loess in a corresponding ratio into the mixed solution B, and uniformly stirring to obtain the non-self-weight collapsible loess area fertilizer tank backfill material.

The invention discloses a fertilizer tank backfilling method realized by using a fertilizer tank backfilling material in a non-self-weight collapsible loess area, which comprises the following steps:

1) adding a dispersing agent and the ultrafine powder into a fixed container, introducing water with a corresponding ratio, and stirring uniformly to fully mix the dispersing agent and the ultrafine powder to form a mixed solution A;

2) adding cement and fly ash in a corresponding ratio into the mixed liquid A in the step 1) according to the collapsibility grade of the non-self-weight collapsible loess area, and uniformly stirring to form mixed liquid B;

3) adding loess with a corresponding ratio into the mixed solution B, and uniformly stirring to obtain a non-self-weight collapsible loess area fertilizer tank backfill material;

4) slowly pouring the backfill material of the fertilizer tank in the non-self-weight collapsible loess area into the fertilizer tank to fill the fertilizer tank, wherein the backfill material of the fertilizer tank in the non-self-weight collapsible loess area can be self-compacted to form solidified loess, and curing until the strength of the solidified loess reaches 0.2-0.4 MPa to finish the backfilling of the fertilizer tank.

When the collapsible grade of the non-self-weight collapsible loess area is level I, the method for backfilling the fertilizer tank by using the backfilling material of the fertilizer tank in the non-self-weight collapsible loess area comprises the following steps of 2): adding 3-5 parts of cement and 2-5 parts of fly ash into the mixed solution A obtained in the step 1), and stirring for 0.8h until the mixture is uniformly mixed to form a mixed solution B;

the step 3) is as follows: adding 74 parts of loess into the mixed solution B, and stirring for 0.4h until uniformly mixing to prepare a non-self-weight collapsible loess area fertilizer tank backfill material;

the step 4) is as follows: slowly pouring the backfill material of the fertilizer tank in the non-self-weight collapsible loess area into the fertilizer tank to fill the fertilizer tank, wherein the backfill material of the fertilizer tank in the non-self-weight collapsible loess area can be self-compacted to form solidified loess, and curing for 10-15 days until the strength of the solidified loess reaches 0.2-0.4 MPa, thereby completing the backfill of the fertilizer tank.

When the collapsible grade of the non-self-weight collapsible loess area is level II, the method for backfilling the fertilizer groove by using the backfilling material of the fertilizer groove in the non-self-weight collapsible loess area comprises the following steps of 2): adding 12-20 parts of cement and 2-5 parts of fly ash into the mixed solution A obtained in the step 1), and stirring for 1 hour until the mixture is uniformly mixed to form a mixed solution B;

the step 3) is as follows: adding 65 parts of loess into the mixed liquid B, and stirring for 0.5h to mix uniformly to prepare a non-self-weight collapsible loess area fertilizer tank backfill material;

the step 4) is as follows: slowly pouring the backfill material of the fertilizer tank in the non-self-weight collapsible loess area into the fertilizer tank to fill the fertilizer tank, wherein the backfill material of the fertilizer tank in the non-self-weight collapsible loess area can be self-compacted to form solidified loess, and curing for 15-20 days until the strength of the solidified loess reaches 0.2-0.4 MPa, thereby completing the backfill of the fertilizer tank.

The technical solution of the present invention is further described below with reference to specific examples and experimental data.

Example 1

When the collapsible grade of the non-self-weight collapsible loess area is level II, the fertilizer tank backfill material of the non-self-weight collapsible loess area consists of the following raw materials in percentage by mass: 65 parts of loess, 12-20 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of superfine powder and 15-25 parts of water.

The dispersant is phosphate ethyl ester or calcium lignosulfonate, and has good dispersibility on collapsible loess, so that the loose porous structure of the loess is changed.

The concrete method for carrying out the fertilizer tank backfilling by using the fertilizer tank backfilling material in the non-self-weight collapsible loess area is realized by the following steps:

1) adding a dispersing agent and the ultrafine powder into a square container with the size of 5m multiplied by 4m, placing a concrete stirrer in the square container, introducing water, starting the concrete stirrer to stir for 0.5h till the mixture is uniformly stirred, and fully mixing the dispersing agent, the ultrafine powder and the water to form a mixed solution A;

2) adding cement and fly ash into the mixed solution A obtained in the step 1), and stirring for 1h until uniformly mixing to form a mixed solution B;

3) adding loess with a certain proportion into the mixed solution B, stirring for 0.5h until uniformly mixing to obtain a non-self-weight collapsible loess region fertilizer tank backfill material;

4) slowly pouring the backfill material of the fertilizer groove in the non-self-weight collapsible loess area prepared in the step 3) into the fertilizer groove by using a high-power guide pipe to fill the fertilizer groove, wherein the backfill material of the fertilizer groove in the non-self-weight collapsible loess area can be self-compacted to form solidified loess, and maintaining for 20 days until the strength of the solidified loess reaches 0.4MPa, thereby completing the backfilling of the fertilizer groove.

Example 2

When the collapsible grade in the non-self-weight collapsible loess area is level I, the backfill material for the fertilizer tank in the non-self-weight collapsible loess area is composed of the following raw materials in parts by mass: 74 parts of loess, 3-5 parts of cement, 2-5 parts of fly ash, 1-5 parts of dispersing agent, 5-8 parts of ultrafine powder and 15-25 parts of water.

The dispersant is phosphate ethyl ester or calcium lignosulfonate, and has good dispersibility on collapsible loess, so that the loose porous structure of the loess is changed.

The concrete method for carrying out the fertilizer tank backfilling by using the fertilizer tank backfilling material in the non-self-weight collapsible loess area is realized by the following steps:

1) adding a dispersing agent and the ultrafine powder into a square container with the size of 5m multiplied by 4m, placing a concrete stirrer in the square container, introducing water, starting the concrete stirrer to stir for 0.5h till the mixture is uniformly stirred, and fully mixing the dispersing agent, the ultrafine powder and the water to form a mixed solution A;

2) adding cement and fly ash in a ratio into the mixed solution A in the step 1), and stirring for 0.8h until uniformly mixing to form a mixed solution B;

3) adding loess with a certain proportion into the mixed solution B, stirring for 0.4h until uniformly mixing to obtain a non-self-weight collapsible loess region fertilizer tank backfill material;

4) slowly pouring the backfill material of the fertilizer groove in the non-self-weight collapsible loess area prepared in the step 3) into the fertilizer groove by using a high-power guide pipe to fill the fertilizer groove, wherein the backfill material of the fertilizer groove in the non-self-weight collapsible loess area can be self-compacted to form solidified loess, and maintaining for 12d until the strength of the solidified loess reaches 0.3MPa, thereby completing the backfilling of the fertilizer groove.

Example 3

The fertilizer tank backfill material for the non-self-weight collapsible loess area comprises the following raw materials in parts by mass: 65 parts of loess, 5 parts of cement, 5 parts of fly ash, 5 parts of a dispersing agent, 5 parts of superfine powder and 15 parts of water.

Example 4

The fertilizer tank backfill material for the non-self-weight collapsible loess area comprises the following raw materials in parts by mass: 74 parts of loess, 3 parts of cement, 2 parts of fly ash, 1 part of dispersant, 5 parts of superfine powder and 25 parts of water.

Through experimental detection, mechanical property indexes of the solidified loess in the above examples are shown in the following table according to a standard solidified loess test block of 150mmX150mmX150mm which is cured for 28 days.

As can be seen from the above table, after the cement is added into the solidified loess, the slump, compressive strength and impermeability of the loess are improved. The slump of the solidified loess is obviously increased along with the reduction of the cement content; the compressive strength degree of the solidified loess is obviously reduced along with the reduction of the cement content; the permeability coefficient of the solidified loess is remarkably reduced with the reduction of the cement content.

Factors influencing the slump, compressive strength and impermeability of the cured loess include the type and property of the loess, the type and mixing amount of the curing agent, the sample preparation density, the curing age of the cured loess test block and the like. Curing agent is added into the same loess for curing, and the curing age of the cured loess is prolonged along with the increase of the mixing amount of the curing agent, and the permeability coefficient is in a descending trend. In actual engineering, in order to make the solidified loess meet engineering requirements and have good compressive strength and impermeability, the curing age of the solidified loess should be extended as much as possible, and further, it is also considered to increase the degree of compaction or density.

The present invention and the technical contents not specifically described in the above embodiments are the same as the prior art.

The present invention is not limited to the above-described embodiments, and the present invention can be implemented with the above-described advantageous effects.

The above embodiments are only specific embodiments disclosed in the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention disclosed in the present invention should be subject to the scope of the claims.