Sludge fluid soil and preparation process thereof

Abstract

The invention relates to the technical field of building material preparation, and particularly discloses sludge fluid soil and a preparation process thereof.In a curing agent provided by the invention, cement, fly ash, slag and calcium oxide can be subjected to hydrolysis and hydration reaction with water and soil particles in sludge to generate hydrated calcium silicate to wrap the surface of a soil body, so that the structure of the soil body is compact; calcium oxide can activate potential active components in the slag, secondary reaction with the potential active components is carried out, more gelatinization products are generated, the strength and anti-permeability of the solidified soil are further enhanced, sodium lignin sulfonate can improve the flowability of the fluid solidified soil and improve the construction performance, meanwhile, uniform distribution of the solidifying agent in the soil body is facilitated, and the solidification effect of the solidified soil is improved. The problem of insufficient local strength is avoided; and the modified glass fibers can fill micropores in the sludge fluid soil, so that the structure of the sludge fluid soil is more compact, water permeation is blocked, and the mechanical property and anti-permeability performance of the sludge fluid soil are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building material preparation, and particularly relates to a kind of silt fluid soil and its preparation process. Background Art

[0002] With the acceleration of the urbanization process, a large amount of silt-like waste soil and dredged silt are generated in projects such as building foundation pit excavation and river dredging. Such silt has characteristics such as high organic matter content, fine particles and strong viscosity. Traditional treatment methods such as stacking or incineration not only occupy land resources but also cause secondary pollution. At the same time, China has put forward the sustainable development goal of "energy conservation, soil conservation, waste utilization, and environmental protection", and there is an urgent need to convert waste silt into utilizable engineering materials to reduce the consumption of natural sand and gravel resources and environmental pollution.

[0003] Traditional silt treatment methods mainly include landfill treatment, incineration treatment and yard treatment, but these traditional methods generally have the problems of secondary pollution risk, high energy consumption or land occupation. In contrast, the solidification technology has become a breakthrough direction in recent years due to its high efficiency and environmental protection: by adding solidifying agents such as cement and lime or special composite dispersants (such as sodium metaphosphate-sodium oxalate), combined with a multi-stage stirring process, the strength and stability of silt can be significantly improved, realizing the resource utilization of silt.

[0004] For example, Chinese patent document CN116217190A discloses a kind of fluid soil based on dredged silt and its preparation method, and its raw materials include cement, quicklime, fly ash, dredged silt and superabsorbent resin; among them, cement accounts for 6% - 10% of the mass of dredged silt, fly ash accounts for 12% - 20% of the mass of dredged silt, quicklime accounts for 5% - 10% of the mass of dredged silt, and superabsorbent resin accounts for 1‰ - 2.5‰ of the mass of dredged silt; the water content of the dredged silt is 2 - 3 times the liquid limit water content; this fluid soil directly incorporates cement, quicklime, fly ash and superabsorbent resin into the dredged silt, and converts it into a fluid soil with good fluidity and good strength after solidification for use as soil for foundation pit and subgrade filling, but the mechanical properties and impermeability of the fluid soil prepared by it still need to be improved. For engineering applications, impermeability and durability are key performance indicators of solidified soil. Especially in a water environment or freeze-thaw environment, insufficient impermeability will cause the performance of solidified soil to degrade rapidly. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a kind of silt fluid soil and its preparation process, and the prepared silt fluid soil has good mechanical properties and impermeability.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A preparation process of a kind of silt fluid soil, comprising the following steps:

[0008] S1. Add a certain amount of water to the silt, stir evenly and then perform sieving treatment to obtain silt slurry;

[0009] S2. Mix cement, fly ash, modified glass fiber, slag, calcium oxide and sodium lignosulfonate evenly to obtain a curing agent;

[0010] S3. Mix the silt slurry and the curing agent evenly, and cure it through natural curing to obtain silt fluid soil.

[0011] In the technical solution disclosed by the present invention, in step S1, the sieve mesh selected for the sieving treatment is 80 mesh - 200 mesh. In some embodiments of the present invention, for example, 80 mesh, 120 mesh, 160 mesh, 200 mesh can be selected, but it is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0012] In the technical solution disclosed by the present invention, in step S1, the water content of the silt slurry is 40 - 60%, for example, 40%, 45%, 50%, 55%, 60% can be selected, but it is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0013] In the technical solution disclosed by the present invention, in step S2, the weight parts of each component are as follows:

[0014] Cement 15 - 25 parts, for example, 15 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 25 parts can be selected; fly ash 60 - 80 parts, for example, 60 parts, 62 parts, 64 parts, 65 parts, 68 parts, 70 parts, 72 parts, 75 parts, 78 parts, 80 parts can be selected; slag 20 - 30 parts, for example, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts can be selected; calcium oxide 4 - 8 parts, for example, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts can be selected; sodium lignosulfonate 2 - 4 parts, for example, 2 parts, 3 parts, 4 parts can be selected; modified glass fiber 25 - 40 parts, for example, 25 parts, 30 parts, 35 parts, 40 parts can be selected; but it is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0015] In the curing agent provided by the present invention, cement, fly ash, slag, and calcium oxide can undergo hydrolysis and hydration reactions with the water and soil particles in the silt to generate calcium silicate hydrate, which wraps around the surface of the soil mass, making the structure of the soil mass dense. At the same time, Ca in its hydration products 2+It can react with acidic oxides in the sludge to form water-insoluble crystals, fill the voids, and bond with soil particles to form a soil skeleton. Moreover, calcium oxide can also activate the latent active components in the slag, react with them in a secondary reaction to generate more cementitious products, further enhancing the strength and impermeability of the solidified soil. Sodium lignosulfonate can improve the fluidity of the fluidized solidified soil, improve the construction performance, and at the same time help the uniform distribution of the solidifying agent in the soil body, avoiding the problem of insufficient local strength.

[0016] The preparation method of the modified glass fiber provided by the present invention is as follows:

[0017] (1) Disperse the pretreated oil shale semicoke in an ethanol aqueous solution, and then add vinyltriethoxysilane thereto, and stir for 1 - 3 h to obtain vinyl-grafted oil shale semicoke;

[0018] (2) Disperse the vinyl-grafted oil shale semicoke in ethanol, and then add oleic acid and an initiator thereto, and react at 50 - 60 °C for 2 - 4 h. After the reaction is completed, filter, wash, and dry to obtain modified oil shale semicoke;

[0019] (3) Disperse the glass fiber in an ethanol aqueous solution, and then add 3-aminopropyltrimethoxysilane thereto, and stir for 1 - 3 h to obtain amino-grafted glass fiber;

[0020] (4) Disperse the amino-grafted glass fiber and the modified oil shale semicoke in ethanol, and then add a crosslinking agent thereto, and react at 50 - 60 °C for 2 - 5 h. After the reaction is completed, filter, wash, and dry to obtain the modified glass fiber.

[0021] In the technical solution disclosed by the present invention, in step (1), the operation steps of the pretreated oil shale semicoke are as follows: Calcinate the oil shale semicoke in an air atmosphere at 600 °C for 2 h, then cool it to room temperature, and crush it through a 200-mesh sieve to obtain the pretreated oil shale semicoke.

[0022] By calcining the oil shale semicoke, unstable variable-valence metal ions, organic matter, and associated substances such as carbonate and pyrite in the oil shale semicoke can be removed.

[0023] In the technical solution disclosed by the present invention, in step (1), the mass ratio of the pretreated oil shale semicoke to vinyltriethoxysilane is 8 - 12:1 - 3. In some embodiments of the present invention, for example, 8:1, 8:2, 8:3, 10:1, 10:2, 10:3, 12:1, 12:2, 12:3 can be selected, but it is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0024] In the technical solution disclosed by the present invention, in step (2), the mass ratio of vinyl grafted oil shale semicoke, oleic acid and initiator is 10 - 15:4 - 8:0.5 - 1.

[0025] Specifically, the initiator is selected from azodiisobutyronitrile.

[0026] In the technical solution disclosed by the present invention, in step (3), the mass ratio of glass fiber and 3 - aminopropyltrimethoxysilane is 10 - 15:2 - 5. In some embodiments of the present invention, for example, 10:2, 10:3, 10:4, 10:5, 12:2, 12:4, 12:5, 15:2, 15:3, 15:4, 15:5 can be selected, but it is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0027] In the technical solution disclosed by the present invention, in step (4), the mass ratio of amino - grafted glass fiber, modified oil shale semicoke and cross - linker is 10 - 15:3 - 5:4 - 6.

[0028] Specifically, the cross - linker is selected from bisphenol A diglycidyl ether or ethylene glycol diglycidyl ether.

[0029] In the present invention, first, vinyltriethoxysilane is used to perform surface treatment on the pretreated oil shale semicoke to introduce carbon - carbon double bonds on the surface of the oil shale semicoke. Then, through the addition reaction between the double bonds, oleic acid is grafted on the surface of the oil shale semicoke to obtain modified oil shale semicoke. Oleic acid has a hydrophobic alkyl long - chain structure, making the oil shale semicoke exhibit hydrophobicity. Subsequently, under the action of the cross - linker, the modified oil shale semicoke is grafted on the surface of the glass fiber, making the glass fiber have excellent hydrophobic performance. At the same time, through the chemical grafting method, the modified oil shale semicoke is not easily detached from the surface of the glass fiber. The modified glass fibers overlap with each other in the silt - like fluid soil to form a cross - linked network structure, which can not only play a role in skeleton support, effectively disperse and transfer stress, and improve the mechanical properties of the silt - like fluid soil; moreover, the hydrophobic performance of the modified glass fiber plays a role in delaying or even hindering the penetration of water molecules; in addition, the oil shale semicoke on the surface of the modified glass fiber can also fill the micropores in the silt - like fluid soil, making the structure of the silt - like fluid soil more dense, blocking the penetration of water, and further improving the mechanical properties and anti - permeability of the silt - like fluid soil.

[0030] In the technical solution disclosed by the present invention, in step S3, the mass ratio of silt slurry and curing agent is 80 - 120:40 - 60. In some embodiments of the present invention, for example, 80:40, 80:50, 80:60, 100:40, 100:50, 100:60, 120:40, 120:50, 120:60 can be selected, but it is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0031] The present invention also provides the sludge fluid soil prepared by the above preparation process.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) In the curing agent provided by the present invention, cement, fly ash, slag, and calcium oxide can undergo hydrolysis and hydration reactions with water and soil particles in the sludge, generating calcium silicate hydrate to wrap on the surface of the soil body, making the structure of the soil body dense. At the same time, Ca in its hydration products 2+ can react with acidic oxides in the sludge to form water-insoluble crystals, fill the voids, and bond with soil particles to form a soil skeleton. Moreover, calcium oxide can also activate the latent active components in the slag, undergo a secondary reaction with it, generate more cementitious products, further enhancing the strength and impermeability of the solidified soil. Sodium lignosulfonate can improve the fluidity of the fluid-solidified soil, improve the construction performance, and at the same time help the uniform distribution of the curing agent in the soil body, avoiding the problem of insufficient local strength.

[0034] (2) In the present invention, the surface of the pretreated oil shale semicoke is first treated with vinyltriethoxysilane to introduce carbon-carbon double bonds on the surface of the oil shale semicoke, and then oleic acid is grafted on the surface of the oil shale semicoke through an addition reaction between the double bonds. Oleic acid has a hydrophobic alkyl long-chain structure, making the oil shale semicoke exhibit hydrophobicity. Subsequently, under the action of a crosslinking agent, the modified oil shale semicoke is grafted on the surface of the glass fiber, making the glass fiber have excellent hydrophobic properties. At the same time, through chemical grafting, the modified oil shale semicoke is not easily detached from the surface of the glass fiber. The modified glass fibers overlap with each other in the sludge fluid soil to form a crosslinked network structure, which can not only play a role in skeleton support, effectively disperse and transfer stress, and improve the mechanical properties of the sludge fluid soil; but also the hydrophobic properties of the modified glass fibers play a role in delaying or even hindering the penetration of water molecules. In addition, the oil shale semicoke on the surface of the modified glass fiber can also fill the micropores in the sludge fluid soil, making the structure of the sludge fluid soil more dense, blocking the penetration of water, and further improving the mechanical properties and impermeability of the sludge fluid soil. Specific embodiments

[0035] The following further details the present invention through specific and preferred embodiments, but the present invention is not limited to the following embodiments.

[0036] It should be noted that unless otherwise specified, the chemical reagents involved in the present invention are all purchased through commercial channels.

[0037] The sources of some raw materials used in the present invention are as follows:

[0038] Cement, with the model of PO 42.5 ordinary Portland cement;

[0039] The fineness of fly ash is 200 mesh, and it is class II fly ash;

[0040] The length of glass fiber is 1 - 3 mm;

[0041] The slag is blast furnace slag powder: S95 grade;

[0042] The fineness of calcium oxide is 200 mesh, and the content of effective component is 90%.

[0043] Example 1

[0044] A preparation process of silt fluid soil, comprising the following steps:

[0045] S1. Add a certain amount of water to the silt, stir evenly, and then sieve it through a 160 - mesh sieve to obtain silt slurry, and control the water content of the silt slurry to be 50%;

[0046] S2. Mix 20 parts of cement, 65 parts of fly ash, 30 parts of modified glass fiber, 25 parts of slag, 5 parts of calcium oxide and 3 parts of lignosulfonate evenly to obtain a curing agent;

[0047] Among them, the preparation method of the modified glass fiber is as follows:

[0048] (1) Calcinate oil shale semicoke in an air atmosphere at 600 °C for 2 h, then cool it to room temperature, crush it and sieve it through a 200 - mesh sieve to obtain pretreated oil shale semicoke;

[0049] (2) Disperse 10 g of pretreated oil shale semicoke in 150 mL of 80 wt% ethanol aqueous solution, then add 2 g of vinyltriethoxysilane to it, and stir for 2 h to obtain vinyl - grafted oil shale semicoke;

[0050] (3) Disperse 10 g of vinyl - grafted oil shale semicoke in 150 mL of ethanol, then add 5 g of oleic acid and 0.5 g of initiator azobisisobutyronitrile to it, react at 50 °C for 4 h, after the reaction is completed, filter, wash and dry to obtain modified oil shale semicoke;

[0051] (4) Disperse 10 g of glass fiber in 150 mL of 80 wt% ethanol aqueous solution, then add 2 g of 3 - aminopropyltrimethoxysilane to it, and stir for 2 h to obtain amino - grafted glass fiber;

[0052] (5) Disperse 10 g of amino - grafted glass fiber and 5 g of modified oil shale semicoke in 150 mL of ethanol, then add 6 g of cross - linker bisphenol A diglycidyl ether to it, react at 50 °C for 5 h, after the reaction is completed, filter, wash and dry to obtain modified glass fiber.

[0053] S3. Mix 100 parts of silt slurry and 50 parts of curing agent evenly, and obtain the silt fluid soil after natural curing.

[0054] Example 2

[0055] A preparation process of silt fluid soil includes the following steps:

[0056] S1. Add a certain amount of water to the silt, stir evenly and then pass through a 160-mesh sieve to obtain silt slurry, and control the water content of the silt slurry to be 45%;

[0057] S2. Mix 15 parts of cement, 60 parts of fly ash, 25 parts of modified glass fiber, 20 parts of slag, 4 parts of calcium oxide and 2 parts of sodium lignosulfonate evenly to obtain a curing agent;

[0058] Among them, the preparation method of the modified glass fiber is as follows:

[0059] (1) Calcinate oil shale semicoke in an air atmosphere at 600 °C for 2 h, then cool to room temperature, crush and pass through a 200-mesh sieve to obtain pretreated oil shale semicoke;

[0060] (2) Disperse 12 g of pretreated oil shale semicoke in 150 mL of 80 wt% ethanol aqueous solution, then add 3 g of vinyltriethoxysilane to it and stir for 2 h to obtain vinyl-grafted oil shale semicoke;

[0061] (3) Disperse 15 g of vinyl-grafted oil shale semicoke in 150 mL of ethanol, then add 8 g of oleic acid and 1 g of initiator azobisisobutyronitrile to it, react at 60 °C for 2 h, after the reaction is completed, filter, wash and dry to obtain modified oil shale semicoke;

[0062] (4) Disperse 15 g of glass fiber in 150 mL of 80 wt% ethanol aqueous solution, then add 5 g of 3-aminopropyltrimethoxysilane to it and stir for 2 h to obtain amino-grafted glass fiber;

[0063] (5) Disperse 15 g of amino-grafted glass fiber and 5 g of modified oil shale semicoke in 150 mL of ethanol, then add 6 g of crosslinking agent bisphenol A diglycidyl ether to it, react at 50 °C for 5 h, after the reaction is completed, filter, wash and dry to obtain modified glass fiber.

[0064] S3. Mix 120 parts of silt slurry and 40 parts of curing agent evenly, and obtain the silt fluid soil after natural curing.

[0065] Example 3

[0066] A preparation process of silt fluid soil includes the following steps:

[0067] S1. Add a certain amount of water to the silt, stir evenly, and then sieve through a 160-mesh sieve to obtain silt slurry, and control the water content of the silt slurry to be 60%;

[0068] S2. Mix 25 parts of cement, 80 parts of fly ash, 40 parts of modified glass fiber, 30 parts of slag, 8 parts of calcium oxide and 4 parts of sodium lignosulfonate evenly to obtain a curing agent;

[0069] Among them, the preparation method of the modified glass fiber is as follows:

[0070] (1) Calcinate the oil shale semicoke in an air atmosphere at 600 °C for 2 h, then cool it to room temperature, crush it and sieve through a 200-mesh sieve to obtain pretreated oil shale semicoke;

[0071] (2) Disperse 8 g of pretreated oil shale semicoke in 150 mL of 80 wt% ethanol aqueous solution, then add 1 g of vinyltriethoxysilane to it, and stir for 2 h to obtain vinyl-grafted oil shale semicoke;

[0072] (3) Disperse 12 g of vinyl-grafted oil shale semicoke in 150 mL of ethanol, then add 6 g of oleic acid and 1 g of initiator azobisisobutyronitrile to it, react at 60 °C for 2 h, after the reaction is completed, filter, wash, and dry to obtain modified oil shale semicoke;

[0073] (4) Disperse 12 g of glass fiber in 150 mL of 80 wt% ethanol aqueous solution, then add 3 g of 3-aminopropyltrimethoxysilane to it, and stir for 2 h to obtain amino-grafted glass fiber;

[0074] (5) Disperse 12 g of amino-grafted glass fiber and 4 g of modified oil shale semicoke in 150 mL of ethanol, then add 5 g of crosslinking agent bisphenol A diglycidyl ether to it, react at 50 °C for 5 h, after the reaction is completed, filter, wash, and dry to obtain modified glass fiber.

[0075] S3. Mix 80 parts of silt slurry and 60 parts of curing agent evenly, and cure by natural curing to obtain silt flowable soil.

[0076] Comparative Example 1

[0077] A preparation process of silt flowable soil, including the following steps:

[0078] S1. Add a certain amount of water to the silt, stir evenly, and then sieve through a 160-mesh sieve to obtain silt slurry, and control the water content of the silt slurry to be 50%;

[0079] S2. Mix 20 parts of cement, 65 parts of fly ash, 20 parts of glass fiber, 10 parts of pretreated oil shale semicoke, 25 parts of slag, 5 parts of calcium oxide and 3 parts of sodium lignosulfonate evenly to obtain a curing agent;

[0080] S3. Mix 100 parts of silt slurry and 50 parts of curing agent evenly, and cure them through natural curing to obtain silt fluid soil.

[0081] Compared with Example 1, in Comparative Example 1, directly mix glass fiber, pretreated oil shale semicoke and other raw materials.

[0082] Comparative Example 2

[0083] A preparation process of silt fluid soil includes the following steps:

[0084] S1. Add a certain amount of water to the silt, stir evenly and then sieve it through a 160-mesh sieve to obtain silt slurry, and control the water content of the silt slurry to be 50%;

[0085] S2. Mix 20 parts of cement, 65 parts of fly ash, 30 parts of modified glass fiber, 25 parts of slag, 5 parts of calcium oxide and 3 parts of sodium lignosulfonate evenly to obtain a curing agent;

[0086] Among them, the preparation method of the modified glass fiber is as follows:

[0087] Disperse 10 g of glass fiber in 150 mL of 80 wt% ethanol aqueous solution, then add 2 g of 3-aminopropyltrimethoxysilane to it, and stir for 2 h to obtain modified glass fiber;

[0088] S3. Mix 100 parts of silt slurry and 50 parts of curing agent evenly, and cure them through natural curing to obtain silt fluid soil.

[0089] Compared with Example 1, in Comparative Example 2, only use 3-aminopropyltrimethoxysilane to modify the glass fiber.

[0090] Comparative Example 3

[0091] A preparation process of silt fluid soil includes the following steps:

[0092] S1. Add a certain amount of water to the silt, stir evenly and then sieve it through a 160-mesh sieve to obtain silt slurry, and control the water content of the silt slurry to be 50%;

[0093] S2. Mix 20 parts of cement, 65 parts of fly ash, 20 parts of modified glass fiber, 10 parts of modified oil shale semicoke, 25 parts of slag, 5 parts of calcium oxide and 3 parts of sodium lignosulfonate evenly to obtain a curing agent;

[0094] Among them, the preparation method of the modified oil shale semicoke is as follows:

[0095] (1) Calcinate the oil shale semicoke in an air atmosphere at 600 °C for 2 h, then cool it to room temperature, crush it and pass it through a 200-mesh sieve to obtain the pretreated oil shale semicoke;

[0096] (2) Disperse 10 g of the pretreated oil shale semicoke in 150 mL of an 80 wt% ethanol aqueous solution, then add 2 g of vinyltriethoxysilane to it and stir for 2 h to obtain vinyl-grafted oil shale semicoke;

[0097] (3) Disperse 10 g of the vinyl-grafted oil shale semicoke in 150 mL of ethanol, then add 5 g of oleic acid and 0.5 g of the initiator azobisisobutyronitrile to it, react at 50 °C for 4 h, and after the reaction is completed, filter, wash, and dry to obtain the modified oil shale semicoke;

[0098] The preparation method of the modified glass fiber is as follows:

[0099] Disperse 10 g of glass fiber in 150 mL of an 80 wt% ethanol aqueous solution, then add 2 g of 3-aminopropyltrimethoxysilane to it and stir for 2 h to obtain the modified glass fiber;

[0100] S3. Mix 100 parts of sludge slurry and 50 parts of curing agent evenly, and cure it through natural curing to obtain the sludge fluid soil.

[0101] Compared with Example 1, in Comparative Example 3, the modified glass fiber, modified oil shale semicoke and other raw materials are directly blended.

[0102] Perform performance tests on the sludge fluid soil prepared in Examples 1-3 and Comparative Examples 1-3. The specific steps are as follows:

[0103] Test of the unconfined compressive strength at 28 days: Test according to the unconfined compressive strength test method in the "Highway Geotechnical Test Procedures" JTJ051-93. Take 3 test specimens for testing and take the average value of the results.

[0104] Test of the permeability coefficient: Test the permeability coefficient according to the "Standard for Geotechnical Test Methods" GB / T 50123-2019.

[0105] The test results are shown in Table 1.

[0106] Table 1 Performance test results of the sludge fluid soil

[0107]

[0108] It can be seen from Table 1 that the sludge fluid soil prepared in the examples of the present invention has higher mechanical strength and lower permeability coefficient.

[0109] Finally, it should be noted that the above embodiments do not limit the present invention in any form. For those skilled in the art, based on the present invention, some modifications and improvements can be made to it. Therefore, any modification or improvement made without departing from the spirit of the present invention falls within the scope of protection required by the present invention.

Claims

1. A process for preparing silt fluidized soil, characterized in that: The steps include: S1. Add water to the sludge, stir it evenly and then sieve it to obtain sludge slurry; S2, mixing cement, fly ash, modified glass fiber, slag, calcium oxide and sodium lignin sulfonate to obtain a curing agent; S3. The silt slurry and the curing agent are mixed evenly, and the silt fluidized soil is obtained by natural curing and curing.

2. The preparation process according to claim 1, characterized in that: In step S1, the water content of the sludge slurry is 40-60%.

3. The preparation process according to claim 1, characterized in that: In step S2, the weight proportions of the components are: 15-25 parts of cement, 60-80 parts of fly ash, 25-40 parts of modified glass fiber, 20-30 parts of slag, 4-8 parts of calcium oxide, and 2-4 parts of sodium lignin sulfonate.

4. The preparation process according to claim 1, characterized in that: In step S2, the preparation method of the modified glass fiber is as follows: (1) dispersing the pretreated oil shale semi-coke in an ethanol aqueous solution, then adding vinyl triethoxysilane thereto, and stirring for 1-3 hours to obtain vinyl grafted oil shale semi-coke; (2) dispersing the vinyl grafted oil shale semi-coke in ethanol, then adding oleic acid and an initiator thereto, reacting at 50-60° C. for 2-4 hours, and after the reaction is completed, filtering, washing, and drying to obtain modified oil shale semi-coke; (3) dispersing the glass fiber in an ethanol aqueous solution, then adding 3-aminopropyltrimethoxysilane thereto, and stirring for 1-3 hours to obtain an amino-grafted glass fiber; (4) The amino-grafted glass fiber and the modified oil shale semi-coke are dispersed in ethanol, and then a cross-linking agent is added thereto, and the mixture is reacted at 50-60° C. for 2-5 hours. After the reaction is completed, the mixture is filtered, washed, and dried to obtain the modified glass fiber.

5. The preparation process according to claim 4, characterized in that: In step (1), the mass ratio of pretreated oil shale semi-coke to vinyltriethoxysilane is 8-12:1-3.

6. The preparation process according to claim 4, characterized in that: In step (2), the mass ratio of vinyl grafted oil shale semi-coke, oleic acid and initiator is 10-15:4-8:0.5-1, wherein the initiator is selected from azobisisobutyronitrile.

7. The preparation process according to claim 4, characterized in that: In step (3), the mass ratio of glass fiber to 3-aminopropyltrimethoxysilane is 10-15:2-5.

8. The preparation process according to claim 4, characterized in that: In step (4), the mass ratio of amino-grafted glass fiber, modified oil shale semi-coke and cross-linking agent is 10-15:3-5:4-6, and the cross-linking agent is selected from bisphenol A diglycidyl ether or ethylene glycol diglycidyl ether.

9. The preparation process according to claim 1, characterized in that: In step S3, the mass ratio of sludge slurry to curing agent is 80-120:40-60.

10. Silt fluidized soil prepared by the preparation process according to any one of claims 1 to 9.

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