Fluidized solidified soil with high-organic-matter sludge as base material and preparation method of fluidized solidified soil

Abstract

The invention provides fluid-state solidified soil with high-organic-matter sludge as a base material and a preparation method of the fluid-state solidified soil. The fluid-state solidified soil with the high-organic-matter sludge as the base material comprises the following components in parts by weight: 80-100 parts of the high-organic-matter sludge, 10-15 parts of a curing agent, 10-30 parts of construction waste, 0.04-0.2 part of a dispersing agent, 0.1-0.2 part of a viscosity reducer and the balance of water, the water-to-material ratio of the flow-state solidified soil is 0.8 to 1.2. The high-organic-matter sludge is adopted as a basic raw material, the viscosity of the high-organic-matter sludge is reduced by adding the dispersing agent and the viscosity reducer, and the flowing property of the high-organic-matter sludge is improved by adding the construction waste to increase the wet density, so that the flow-state solidified soil with high wet density, high dispersity and high flowability is prepared; therefore, a foundation is provided for high-value utilization of the high-organic-matter sludge, and a new thought is provided for resource utilization of the sludge.

Description

Technical Field

[0001] The present invention relates to the field of building technology, in particular to a fluidized solidified soil with high-organic sludge as a base material and a preparation method thereof. Background Art

[0002] With the rapid advancement of globalization, silt generated by lake dredging, port construction, and urban pipeline maintenance has become a major challenge threatening the ecological environment and public safety. my country's annual silt removal volume exceeds 1 billion cubic meters, and this volume is expected to increase further with urbanization and the need for ecological governance. Traditional methods of stacking or landfilling not only consume a large amount of land resources, but are also likely to cause secondary pollution due to problems such as heavy metal leaching. At the same time, traditional solidification technologies generally incorporate cement to solidify silt in situ, but the use of cement is energy-intensive. Against this backdrop, there is an urgent need for a silt resource recovery technology that is both efficient, economical, and environmentally friendly.

[0003] Existing silt resource processing technology involves adding specialized cementitious materials adapted to the geotechnical characteristics, as well as necessary water and admixtures, to the silt according to project requirements. The mixture is then uniformly mixed in a specialized mixer to form a workable mixture. After pouring or filling and curing, it solidifies into an engineering material with a certain strength, water stability, and long-term stability. However, the fluidized solidified soil prepared from silt suffers from high viscosity, poor fluidity, and low wet density of the product mixture.

[0004] Therefore, it is particularly important to have a fluidized solidified soil with high organic matter silt as the base material. Summary of the Invention

[0005] The purpose of the present invention is to provide a fluidized solidified soil based on high-organic sludge and a preparation method thereof, so as to solve the technical problems faced by the fluidized solidified soil prepared from existing sludge, such as high viscosity, poor fluidity and low wet density of the product mixture.

[0006] In order to solve the above technical problems, the present invention first provides a fluidized solidified soil with high-organic sludge as the base material, comprising the following components in parts by weight: 80 to 100 parts of high-organic sludge, 10 to 15 parts of a curing agent, 10 to 30 parts of construction waste, 0.04 to 0.2 parts of a dispersant and 0.1 to 0.2 parts of a viscosity reducer, with the remainder being water; the water-to-material ratio of the fluidized solidified soil is 0.8 to 1.2.

[0007] Preferably, the mass content of organic matter in the high-organic sludge is ≥5g / kg, and the water content is 50% to 60%.

[0008] Preferably, the curing agent includes the following components in parts by weight: 6 to 8 parts of slag powder, 0.5 to 1.5 parts of quicklime, 0 to 2.5 parts of cement and 1 to 2 parts of anhydrite.

[0009] Preferably, the granulation grade of slag powder is ≥ S95, and the specific surface area is ≥ 400m 2 / kg.

[0010] Preferably, the mass percentage of calcium oxide in quicklime is ≥85%.

[0011] Preferably, the particle size of the construction waste is ≤10 mm.

[0012] Preferably, the dispersant is a TX-100 type dispersant.

[0013] Accordingly, the present invention further provides a method for preparing fluidized solidified soil based on high-organic sludge as described above, the method comprising: S10, mixing 80-100 parts of high-organic matter sludge, 0.04-0.2 parts of a dispersant, 0.1-0.2 parts of a viscosity reducer, and water, and uniformly stirring the mixture to obtain a sludge slurry; S20, adding 10 to 15 parts of a curing agent and 10 to 30 parts of construction waste to the sludge slurry and uniformly stirring the mixture to obtain a fluidized solidified slurry; S30, pouring the fluidized solidification slurry into a mold and then performing demoulding and curing treatment in sequence to obtain fluidized solidification soil, wherein the water-to-material ratio of the fluidized solidification soil is 0.8-1.2.

[0014] Preferably, in step S20, the curing agent includes the following components in parts by weight: 6 to 8 parts of slag powder, 0.5 to 1.5 parts of quicklime, 0 to 2.5 parts of cement and 1 to 2 parts of anhydrite.

[0015] Preferably, step S30 specifically includes: After pouring the fluidized solidification slurry into the mold, it is covered and cured at a constant temperature and moisture retention condition of 20°C for 1 to 2 days and then demolded. After curing at 20°C and a relative humidity of >95%RH for 25 to 30 days, the fluidized solidified soil is obtained.

[0016] The beneficial effects of the present invention are as follows: Different from the prior art, the present invention provides a fluidized solidified soil based on high-organic sludge and a preparation method thereof. The fluidized solidified soil based on high-organic sludge comprises the following components in parts by weight: 80 to 100 parts of high-organic sludge, 10 to 15 parts of a curing agent, 10 to 30 parts of construction waste, 0.04 to 0.2 parts of a dispersant and 0.1 to 0.2 parts of a viscosity reducer, with the remainder being water; the water-to-material ratio of the fluidized solidified soil is 0.8 to 1.2. The fluidized solidified soil provided by the present invention uses high-organic sludge as a basic raw material, reduces its viscosity by adding a dispersant and a viscosity reducer, and improves its flow properties by increasing its wet density by adding construction waste, thereby preparing a fluidized solidified soil with high wet density, strong dispersibility, and greater fluidity, thereby providing a basis for the high-value utilization of high-organic sludge and providing a new approach to the resource utilization of sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A flow chart of a method for preparing fluidized solidified soil using high-organic sludge as a base material provided by an embodiment of the present invention; Figure 2 Schematic diagram of the preparation process of fluidized solidified soil based on high-organic sludge provided in Examples 1 to 3 of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] In view of the technical problems faced by the existing fluidized solidified soil prepared from silt, such as high viscosity, poor fluidity and low wet density of the product mixture, the present invention provides a fluidized solidified soil based on high-organic matter silt and a preparation method thereof. The fluidized solidified soil uses high-organic matter silt as the basic raw material, reduces its viscosity by using dispersants and viscosity reducers, uses quicklime as an alkali activator and anhydrite as a sulfur activator, slag powder as a curing agent, and is added with construction waste to prepare the fluidized solidified soil, thereby increasing the wet density of the mixture and improving the fluidity performance, providing a basis for the simple and high-value utilization of high-water content and high-organic matter silt, and providing a new idea for the resource utilization of silt.

[0020] In order to achieve the above technical objectives, this application adopts the following technical solutions: In the first aspect, the present invention first provides a fluidized solidified soil with high organic matter sludge as the base material, comprising the following components in parts by weight: 80 to 100 parts of high organic matter sludge, 10 to 15 parts of a curing agent, 10 to 30 parts of construction waste, 0.04 to 0.2 parts of a dispersant and 0.1 to 0.2 parts of a viscosity reducer, with the remainder being water; the water-to-material ratio of the fluidized solidified soil is 0.8 to 1.2.

[0021] Specifically, the above-mentioned fluidized solidified soil is based on 80 to 100 parts of high-organic silt as the base material, and 10 to 15 parts of curing agent (including slag powder, quicklime, etc.) is used to stimulate the gelling reaction to neutralize the acidity of the organic matter. 10 to 20 parts of ≤10mm construction waste are used to optimize the grading and reinforce the skeleton. 0.04 to 0.2 parts of dispersant and 0.1 to 0.2 parts of viscosity reducer are used to regulate the rheological properties. The remaining water is used to control the water-to-material ratio to 0.8 to 1.2, forming a fluidized solidified soil system of "environmentally friendly and efficient cementation + particle grading optimization + precise control of flow properties", which has the advantages of meeting strength standards, convenient construction and waste resource utilization.

[0022] In an embodiment of the present invention, high-organic matter sludge is used as a base material to provide the main structure of the fluidized solidified soil. The organic matter needs to be pretreated to reduce the inhibition of the solidification effect (such as oxidation and sterilization); wherein the mass content of organic matter in the high-organic matter sludge is ≥5g / kg, and the moisture content is 50% to 60%.

[0023] In an embodiment of the present invention, the curing agent generates a binder through a hydration reaction to improve strength and water stability; wherein the curing agent includes the following components in parts by weight: 6 to 8 parts of slag powder, 0.5 to 1.5 parts of quicklime, 0 to 2.5 parts of cement and 1 to 2 parts of anhydrite.

[0024] Specifically, the curing agent, with slag powder as the core cementitious material, activates its activity in the alkaline environment created by quicklime, enhancing later-stage strength. Quicklime neutralizes the acidity of the sludge, adjusts the moisture content, and provides alkaline activation conditions. Cement is added as needed to flexibly control early-stage strength. Anhydrite reacts with other components to form ettringite, compensating for shrinkage and accelerating gelation. The synergistic effect of these components, at a total dosage of 10-15 parts per million, effectively solidifies high-organic matter sludge, achieves controllable workability, and optimizes costs, balancing strength improvement with environmental and economic advantages.

[0025] Furthermore, the quicklime and cement in the curing agent provide alkaline conditions, activating the activity of slag powder and anhydrite, forming a dual-cementing system of "alkaline activation + hydration reaction." This mix design takes into account both material cost and environmental considerations (by utilizing a large amount of waste slag), while also addressing the technical difficulties of solidifying high-organic sludge through chemical activation and physical modification. It is suitable for engineering scenarios such as soft foundation treatment and roadbed backfill.

[0026] Furthermore, slag powder is activated under alkaline conditions (quicklime provides OH⁻) to generate calcium silicate hydrate (CSH) gel, which enhances the later strength; quicklime can neutralize the acidity of high-organic matter sludge and provide an alkaline environment to promote the hydration of slag powder; cement can provide initial hydration products (ettringite, calcium hydroxide) to quickly improve the early strength; anhydrite reacts with slag powder and cement hydration products to generate ettringite, which plays a role in expansion compensation and reinforcement, and inhibits shrinkage cracking.

[0027] In the embodiment of the present invention, the granulation grade of the slag powder is ≥ S95, and the specific surface area is ≥ 400m 2 / kg; Highly granulated slag powder undergoes faster and more complete hydration in an alkaline environment, generating more CSH gel and hydrated calcium aluminate, significantly improving the late-stage strength (28 days and beyond) and cementing capacity of the stabilized soil. Fine-grained slag powder with a larger specific surface area allows for more complete contact with water and alkaline solutions, resulting in faster hydration and more pronounced early strength development.

[0028] In the embodiment of the present invention, the mass percentage of calcium oxide in the quicklime is ≥85%; wherein, a higher mass percentage of calcium oxide can further stimulate the activity of slag powder, generate a large amount of CSH gel, and significantly improve the later strength of the fluidized solidified soil.

[0029] In the embodiment of the present invention, construction waste is added to the fluidized solidified soil to increase the wet density of the mixture while optimizing the particle size distribution and improving the flow properties.

[0030] Specifically, the particle size of construction waste is ≤10mm; by controlling the particle size of construction waste to ≤10mm and optimizing the gradation, the density of fluidized solidified soil can be improved while maintaining construction convenience, which is a typical technical path for green building materials and circular economy.

[0031] In the embodiment of the present invention, the core function of the dispersant is to improve the dispersibility and fluidity of the mixture through its surfactant properties; the dispersant is preferably a TX-100 type dispersant.

[0032] In the embodiment of the present invention, the viscosity reducer is used to reduce the viscous resistance of the mixture and improve the construction performance. The viscosity reducer is preferably any one of polyoxyethylene ether, modified starch and nano-silicon dioxide.

[0033] See also Figure 1 The present invention also provides a method for preparing fluidized solidified soil based on high-organic sludge as described above, the method comprising: S10, 80-100 parts of high-organic matter sludge, 0.04-0.2 parts of a dispersant, 0.1-0.2 parts of a viscosity reducer and water are mixed and uniformly stirred to obtain a sludge slurry.

[0034] Specifically, step S10 further includes: To 80-100 parts of high-organic matter sludge, add 0.04-0.2 parts of TX-100 dispersant and 0.1-0.2 parts of PEG-100 and mix well, then add 60-100 parts of water and stir to completely disperse the high-organic matter sludge to obtain sludge slurry.

[0035] S20, adding 10 to 15 parts of a curing agent and 10 to 30 parts of construction waste to the sludge slurry, respectively, and uniformly stirring the mixture to obtain a fluidized solidified slurry.

[0036] Specifically, step S20 further includes: First, a curing agent is prepared according to the following ratio, wherein the curing agent includes the following components in parts by weight: 6 to 8 parts of slag powder, 0.5 to 1.5 parts of quicklime, 0 to 2.5 parts of cement, and 1 to 2 parts of anhydrite.

[0037] Secondly, 10 to 15 parts of a curing agent and 10 to 30 parts of construction waste are added to the sludge slurry respectively and then uniformly stirred to obtain a fluidized solidified slurry.

[0038] S30, pouring the fluidized solidification slurry into a mold and then performing demoulding and curing treatment in sequence to obtain fluidized solidification soil, wherein the water-to-material ratio of the fluidized solidification soil is 0.8-1.2.

[0039] Specifically, step S30 further includes: After pouring the fluidized solidification slurry into the mold, it is covered and cured for 1 to 2 days under constant temperature and moisturizing conditions at 20°C, and then demoulded. After curing for 25 to 30 days under conditions of 20°C and relative humidity > 95%RH (natural curing), qualified fluidized solidification soil is obtained.

[0040] The technical solution of the present invention will now be further described with reference to specific embodiments.

[0041] Example 1: This embodiment 1 provides a fluidized solidified soil based on high-organic sludge, including the following components in parts by weight: 1200g of high-organic sludge, 200g of construction waste, 3g of TX-100 dispersant, 2.25g of viscosity reducer, 140g of slag powder, 10g of quicklime, 30g of cement, 20g of anhydrite and 496g of water.

[0042] See also Figure 2 This embodiment 1 provides a method for preparing fluidized solidified soil using high-organic sludge as a base material, which specifically includes the following steps: Step (1): 140g of slag powder, 10g of quicklime, 30g of cement, and 20g of anhydrite are mixed evenly to form a curing agent for use; Step (2): adding 496 g of water, 3 g of TX-100 dispersant and 2.25 g of viscosity reducer to 1200 g of high organic matter sludge, and stirring evenly to obtain a sludge slurry; Step (3): Add the curing agent prepared in step (1) and 200 g of construction waste to the sludge slurry, and continue stirring to obtain a fluidized solidified slurry; Step (4): pour the fluidized solidified slurry obtained in step (3) into a mold, cover and cure it at a constant temperature and moisture retention condition of 20°C for 1 day, then demould it, and cure it at 20°C and relative humidity > 95%RH (natural curing) for 28 days to obtain qualified fluidized solidified soil.

[0043] After testing, the fluidity of the fluidized solidified soil prepared in Example 1 with high organic matter sludge as the base material is 260 mm, the 28d compressive strength is 1.69 MPa, and the wet density of the mixture is 1630 kg / m 3 , meeting the backfill requirements for the back of platforms, culverts and walls of transportation projects in the "Technical Standard for Ready-Mixed Fluidized Solidified Soil Filling Engineering" (DBJ51 / T 188-2022) (wet density of the mixture ≥ 1600kg / m 3 ).

[0044] Example 2: This embodiment 2 provides a fluidized solidified soil based on high-organic sludge, including the following components in parts by weight: 1250g of high-organic sludge, 300g of construction waste, 3g of TX-100 dispersant, 3g of viscosity reducer, 140g of slag powder, 10g of quicklime, 20g of cement, 30g of anhydrite and 560g of water.

[0045] See also Figure 2 This embodiment 1 provides a method for preparing fluidized solidified soil using high-organic sludge as a base material, which specifically includes the following steps: Step (1): 140g of slag powder, 10g of quicklime, 20g of cement, and 30g of anhydrite are mixed evenly to form a curing agent for use; Step (2): Add 560 g of water, 3 g of TX-100 dispersant and 3 g of viscosity reducer to 1250 g of high-organic matter sludge, and stir evenly to obtain a sludge slurry; Step (3): adding the curing agent prepared in step (1) and 15 parts of construction waste to the sludge slurry, and continuing to stir evenly to obtain a fluidized solidified slurry; Step (4): pour the fluidized solidified slurry obtained in step (3) into a mold, cover and cure it at a constant temperature and moisture retention condition of 20°C for 1 day, then demould it, and cure it at 20°C and relative humidity > 95%RH (natural curing) for 28 days to obtain qualified fluidized solidified soil.

[0046] After testing, the fluidity of the fluidized solidified soil prepared in Example 2 with high organic matter sludge as the base material is 290mm, the 28d compressive strength is 2.24MPa, and the wet density of the mixture is 1650kg / m 3 , meeting the backfill requirements for the back of platforms, culverts and walls of transportation projects in the "Technical Standard for Ready-Mixed Fluidized Solidified Soil Filling Engineering" (DBJ51 / T 188-2022) (wet density of the mixture ≥ 1600kg / m 3 ).

[0047] Example 3: This embodiment 3 provides a fluidized solidified soil based on high-organic sludge, including the following components in parts by weight: 1500g of high-organic sludge, 350g of construction waste, 2.25g of TX-100 dispersant, 2.25g of viscosity reducer, 175g of slag powder, 25g of quicklime, 25g of cement, 25g of anhydrite and 600g of water.

[0048] See also Figure 2 This embodiment 1 provides a method for preparing fluidized solidified soil using high-organic sludge as a base material, which specifically includes the following steps: Step (1): 175g of slag powder, 25g of quicklime, 25g of cement, and 25g of anhydrite are mixed evenly to form a curing agent for use; Step (2): adding 600 g of water, 2.25 g of TX-100 dispersant and 2.25 g of viscosity reducer to 1500 g of high organic matter sludge, and stirring to obtain sludge slurry; Step (3): adding the curing agent prepared in step (1) and 350 g of construction waste to the sludge slurry, and continuing to stir evenly to obtain a fluidized solidified slurry; Step (4): pour the fluidized solidified slurry obtained in step (3) into a mold, cover and cure it at a constant temperature and moisture retention condition of 20°C for 1 day, then demould it, and cure it at 20°C and relative humidity > 95%RH (natural curing) for 28 days to obtain qualified fluidized solidified soil.

[0049] After testing, the fluidity of the fluidized solidified soil prepared in Example 2 with high organic matter sludge as the base material is 255 mm, the 28d compressive strength is 1.58 MPa, and the wet density of the mixture is 1820 kg / m 3 , meeting the backfill requirements for general road subgrades and other areas in the "Technical Standard for Ready-Mixed Fluidized Solidified Soil Filling Engineering" (DBJ51 / T 188-2022) (mixture wet density ≥ 1800kg / m 3 ).

[0050] Compared with other existing methods, the benefits of the present invention include: (1) The fluidized solidified soil prepared by the present invention with high organic matter sludge as the base material solves the problem that high organic matter sludge is highly viscous and difficult to stir by using a dispersant and a viscosity reducer.

[0051] (2) The fluidized solidified soil prepared by the present invention with high organic matter sludge as the base material utilizes solid wastes such as slag and construction waste to treat high organic matter sludge, thereby obtaining a product with high added value, and a high solid waste utilization rate.

[0052] (3) The fluidized solidified soil prepared by the present invention with high organic matter sludge as the base material uses construction waste to optimize the particle size distribution, improve the fluidity of the fluidized solidified soil, and increase the wet density of the fluidized solidified soil mixture. By adjusting the amount of construction waste and the wet density of the mixture, the backfill requirements of different regions can be met.

[0053] (4) The fluidized solidified soil prepared by the present invention with high organic matter sludge as the base material directly utilizes the high organic matter sludge under high water content conditions, without the need for dehydration treatment of the high organic matter sludge, thereby reducing the utilization cost.

[0054] In summary, it can be seen that, different from the existing technology, the present invention provides a fluidized solidified soil with high organic matter sludge as the base material and a preparation method thereof. The fluidized solidified soil with high organic matter sludge as the base material includes the following components in parts by weight: 80 to 100 parts of high organic matter sludge, 10 to 15 parts of curing agent, 10 to 30 parts of construction waste, 0.04 to 0.2 parts of dispersant and 0.1 to 0.2 parts of viscosity reducer, and the balance is water; the water-to-material ratio of the fluidized solidified soil is 0.8 to 1.2. The fluidized solidified soil provided by the present invention uses high organic matter sludge as the basic raw material, reduces its viscosity by adding dispersant and viscosity reducer, and improves its flow properties by adding construction waste to increase wet density, thereby preparing a fluidized solidified soil with high wet density, strong dispersibility and greater fluidity, thereby providing a basis for the high-value utilization of high organic matter sludge and providing a new idea for the resource utilization of sludge.

[0055] It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own focus. For any details not described in individual embodiments, reference may be made to the description in other embodiments.

[0056] The above embodiments merely illustrate the implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A fluidized solidified soil based on high organic matter sludge, characterized in that: The fluidized solidified soil comprises the following components in parts by weight: 80-100 parts of high-organic matter sludge, 10-15 parts of a curing agent, 10-30 parts of construction waste, 0.04-0.2 parts of a dispersant and 0.1-0.2 parts of a viscosity reducer, with the remainder being water; the water-to-material ratio of the fluidized solidified soil is 0.8-1.

2.

2. The fluidized solidified soil based on high organic matter sludge according to claim 1, characterized in that: The mass content of organic matter in the high-organic matter sludge is ≥5g / kg, and the water content is 50% to 60%.

3. The fluidized solidified soil based on high organic matter sludge according to claim 1, characterized in that: The curing agent comprises the following components in parts by weight: 6-8 parts of slag powder, 0.5-1.5 parts of quicklime, 0-2.5 parts of cement and 1-2 parts of anhydrite.

4. The fluidized solidified soil based on high organic matter sludge according to claim 3, characterized in that: The slag powder has a granulation grade of ≥ S95 and a specific surface area of ​​≥ 400m 2 / kg.

5. The fluidized solidified soil based on high organic matter sludge according to claim 3, characterized in that: The mass percentage of calcium oxide in the quicklime is ≥85%.

6. The fluidized solidified soil based on high organic matter sludge according to claim 1, characterized in that: The particle size of the construction waste is ≤10mm.

7. The fluidized solidified soil based on high organic matter sludge according to claim 1, characterized in that: The dispersant is TX-100 type dispersant.

8. A method for preparing fluidized solidified soil based on high organic matter sludge according to any one of claims 1 to 7, characterized in that: The method comprises: S10, mixing 80-100 parts of the high-organic matter sludge, 0.04-0.2 parts of the dispersant, 0.1-0.2 parts of the viscosity reducer, and water, and uniformly stirring to obtain a sludge slurry; S20, adding 10 to 15 parts of a curing agent and 10 to 30 parts of construction waste to the sludge slurry and uniformly stirring the mixture to obtain a fluidized solidified slurry; S30, pouring the fluidized solidification slurry into a mold and then performing demoulding and curing treatment in sequence to obtain the fluidized solidification soil, wherein the water-to-material ratio of the fluidized solidification soil is 0.8-1.

2.

9. The method for preparing fluidized solidified soil based on high organic matter sludge according to claim 8, characterized in that: In the step S20, the curing agent includes the following components in parts by weight: 6 to 8 parts of slag powder, 0.5 to 1.5 parts of quicklime, 0 to 2.5 parts of cement, and 1 to 2 parts of anhydrite.

10. The method for preparing fluidized solidified soil based on high organic matter sludge according to claim 8, characterized in that: The S30 step specifically includes: After the fluidized solidified slurry is poured into a mold, it is covered and cured for 1 to 2 days under a constant temperature and moisturizing condition of 20° C., and then demoulded. After curing for 25 to 30 days under the condition of 20° C. and relative humidity>95% RH, the fluidized solidified soil is obtained.

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