High-strength heavy metal adsorption soft soil curing agent as well as preparation method and application thereof

Abstract

The invention relates to the technical field of soil improvement, in particular to a high-strength heavy metal adsorption soft soil curing agent and a preparation method and application thereof.The high-strength heavy metal adsorption soft soil curing agent is prepared from, by weight, 20-75 parts of steel slag, 10-60 parts of mineral slag, 5-45 parts of cement, 10-45 parts of fly ash, 0.5-3 parts of potassium fulvate, 2-15 parts of silane coupling agent and 1-9 parts of additive; the preparation method is simple, can improve the mechanical property and heavy metal stability of soft soil and reduce the heavy metal pollution degree of the soft soil when applied to soft soil improvement, and effectively solves the technical problems that heavy metal ions in existing solidified soil are easy to migrate and the mechanical property is poor.

Description

Technical Field

[0001] This invention relates to the field of soil improvement technology, and in particular to a high-strength heavy metal adsorbent for soft soil solidification, its preparation method, and its application. Background Technology

[0002] Soft soil generally refers to cohesive soil in a soft plastic or fluid plastic state, characterized by high water content, high compressibility, low shear strength, and low bearing capacity. Under external loads, soft soil foundations are prone to significant settlement and uneven deformation. Therefore, it is necessary to solidify soft soil to alter its physicochemical structure, improve its bearing capacity, and ensure the structural safety of buildings. Currently, the conventional method for reinforcing soft soil involves adding cement, lime, or industrial solid waste as solidifying agents to improve its bearing capacity. However, solidified soil produced by conventional soft soil solidifying agents often contains heavy metal pollutants such as lead, cadmium, and mercury, which can easily migrate and diffuse into surrounding soil and groundwater systems, causing environmental pollution. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a high-strength heavy metal adsorption soft soil solidification agent, its preparation method, and its application. The solidification agent, prepared from steel slag, blast furnace slag, cement, fly ash, potassium humate, silane coupling agent, and additives, can effectively improve the mechanical properties and heavy metal stability of soft soil, reduce the degree of heavy metal pollution in soft soil, and effectively solve the technical problems of easy migration of heavy metal ions and poor mechanical properties in existing solidified soil.

[0004] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: One technical solution of the present invention provides a high-strength heavy metal adsorbent for soft soil solidification, which, by weight, comprises 20-75 parts steel slag, 10-60 parts blast furnace slag, 5-45 parts cement, 10-45 parts fly ash, 0.5-3 parts potassium humate, 2-15 parts silane coupling agent, and 1-9 parts admixture; wherein the admixture comprises 5-30 parts resveratrol and 5-36 parts diketene.

[0005] In some possible implementations, the raw materials for the soft soil stabilizer, by weight, include 27-64 parts steel slag, 20-50 parts blast furnace slag, 15-36 parts cement, 15-40 parts fly ash, 1-2.5 parts potassium humate, 5-13 parts silane coupling agent, and 2-6 parts admixture; wherein the raw materials for preparing the admixture include 8-26 parts resveratrol and 8-32 parts diketene.

[0006] In some possible implementations, the average particle size of the steel slag is 1-30 μm; preferably, the average particle size of the steel slag is 5-20 μm.

[0007] In some possible implementations, the average particle size of the slag is 1-25 μm; preferably, the average particle size of the slag is 3-19 μm.

[0008] In some possible implementations, the average particle size of fly ash is 2-24 μm; preferably, the average particle size of fly ash is 5-17 μm.

[0009] In some possible implementations, the mass ratio of silane coupling agent to additive is (1-5):1.

[0010] Preferably, the mass ratio of silane coupling agent to additive is (1.8-2.4):1.

[0011] In some possible implementations, the silane coupling agent is selected from any one of KH540, KH550, KH602, and KH792. Preferably, KH550 is used as the silane coupling agent.

[0012] The silane coupling agent in this invention can improve the bonding force of inorganic powders in the curing agent system and impart primary amine groups to them.

[0013] In some possible implementations, the mass ratio of resveratrol to diketene in the admixture is 1:(0.5-1.8).

[0014] Preferably, the mass ratio of resveratrol to diketene is 1:(1-1.3).

[0015] In the admixture structure of this invention, the benzene ring structure in resveratrol is rigid, effectively improving the mechanical properties of soft soil. The hydroxyl groups in resveratrol react with diketene to generate acetoacetic acid groups, which can then bond with primary amine groups on inorganic powders to form long chains and a cross-linked network. This cross-linked network uses the benzene ring in the resveratrol structure as a distribution point. When subjected to external force, the stress is transmitted from the surface along the long chain to the distribution point. A portion of the stress can be absorbed through the benzene ring-benzene ring structure, and the remaining stress can be distributed to other long chain branches, thus completely dissipating the external force and resulting in better mechanical properties. Furthermore, the imino and carbonyl groups in the cross-linked network can synergistically adsorb heavy metal ions such as lead, chromium, and zinc in soft soil through potassium humate, forming insoluble complexes through complexation reactions. This alters the ionic form of heavy metals, reducing their mobility and bioavailability in the soil, thereby reducing heavy metal pollution.

[0016] In some possible implementations, the preparation steps of the additive are as follows: resveratrol is dispersed in deionized water, the reaction system is adjusted to alkaline, the temperature is raised, diketene is added, the mixture is stirred until the reaction is complete, and then filtered, washed, and dried to obtain the additive.

[0017] Preferably, the specific preparation steps of the additive are as follows: resveratrol is dispersed in deionized water, the pH of the reaction system is adjusted to 8-10 with sodium hydroxide aqueous solution, and diketene is added dropwise at a constant rate while stirring at a temperature of 25-60℃ for 10-30 min. Then, stirring is continued for another 30-60 min. After the reaction is completed, the additive is obtained by filtration, washing and drying.

[0018] Furthermore, the mass fraction of resveratrol in deionized water is 30-70%.

[0019] Furthermore, the mass fraction of the sodium hydroxide aqueous solution is 1-5%.

[0020] The present invention also provides a method for preparing a high-strength heavy metal adsorbent for soft soil solidification as described in any of the above embodiments, comprising the following steps: Weigh steel slag, blast furnace slag, cement, fly ash, potassium humate, silane coupling agent and additives, mix them evenly to obtain the soft soil solidifying agent.

[0021] Furthermore, the preparation method of the high-strength heavy metal adsorbent for soft soil solidification as described in any of the above schemes specifically includes the following steps: Weigh out 20-75 parts steel slag, 10-60 parts blast furnace slag, 5-45 parts cement, 10-45 parts fly ash, 0.5-3 parts potassium humate, 2-15 parts silane coupling agent, and 1-9 parts additives by weight, mix them evenly, and the soft soil solidification agent is obtained.

[0022] The present invention also provides the application of the high-strength heavy metal adsorption soft soil solidifying agent or the preparation method of soft soil solidifying agent in any of the above schemes in soil improvement, wherein the mass ratio of soft soil solidifying agent to soft soil is 1:(1-4).

[0023] The present invention has the following beneficial effects: (1) The soft soil solidifying agent developed by the present invention using steel slag, slag, cement, fly ash, potassium humate, silane coupling agent and additives as raw materials has low cost and excellent solidification performance. It can effectively reduce the degree of heavy metal pollution inside soft soil and improve the mechanical properties of soft soil. At the same time, it plays a positive role in promoting the resource utilization of industrial waste such as steel slag, slag, and fly ash. (2) The additive prepared by resveratrol and diketene has a benzene ring and an acetoacetic acid group in its structure. The benzene ring can provide mechanical properties, and the acetoacetic acid group can bond with the silane coupling agent to build a cross-linking network in the soft soil system, improve the binding force of inorganic powder, and thus optimize the mechanical properties of the soft soil test block. (3) Potassium humate is introduced into the soft soil solidifying agent of the present invention. The cross-linking network constructed by the additive and the silane coupling agent generates a stable complex with the heavy metal ions in the soft soil, thereby reducing the migration of heavy metal ions in the soft soil. Detailed Implementation

[0024] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments.

[0025] Example An embodiment of the present invention provides a high-strength heavy metal adsorbent for solidifying soft soil, the raw materials of which, by weight, include 20-75 parts steel slag, 10-60 parts blast furnace slag, 5-45 parts cement, 10-45 parts fly ash, 0.5-3 parts potassium humate, 2-15 parts silane coupling agent and 1-9 parts admixture; wherein, the raw materials for preparing the admixture include 5-30 parts resveratrol and 5-36 parts diketene.

[0026] In some embodiments, the raw materials for the soft soil stabilizer, by weight, include 27-64 parts steel slag, 20-50 parts blast furnace slag, 15-36 parts cement, 15-40 parts fly ash, 1-2.5 parts potassium humate, 5-13 parts silane coupling agent, and 2-6 parts admixture; wherein the raw materials for preparing the admixture include 8-26 parts resveratrol and 8-32 parts diketene.

[0027] In some embodiments, the average particle size of the steel slag is 1-30 μm.

[0028] In some embodiments, the average particle size of the steel slag is 5-20 μm.

[0029] In some embodiments, the average particle size of the slag is 1-25 μm.

[0030] In some embodiments, the average particle size of the slag is 3-19 μm.

[0031] In some embodiments, the average particle size of fly ash is 2-24 μm.

[0032] In some embodiments, the average particle size of fly ash is 5-17 μm.

[0033] In some embodiments, the mass ratio of silane coupling agent to additive is (1-5):1.

[0034] In some embodiments, the mass ratio of silane coupling agent to additive is (1.8-2.4):1.

[0035] In some embodiments, the silane coupling agent is selected from any one of KH540, KH550, KH602, and KH792. Preferably, KH550 is used as the silane coupling agent.

[0036] In some embodiments, the mass ratio of resveratrol to diketene in the admixture is 1:(0.5-1.8).

[0037] In some embodiments, the mass ratio of resveratrol to diketene in the admixture is 1:(1-1.3).

[0038] In some embodiments, the preparation steps of the additive are as follows: resveratrol is dispersed in deionized water, the reaction system is adjusted to alkaline, the temperature is raised, diketene is added dropwise, the mixture is stirred until the reaction is completed, and then filtered, washed, and dried to obtain the additive.

[0039] In some embodiments, the specific preparation steps of the additive are as follows: resveratrol is dispersed in deionized water, the pH of the reaction system is adjusted to 8-10 with sodium hydroxide aqueous solution, and diketene is added dropwise at a constant rate while stirring at a temperature of 25-60°C for 10-30 min. Then, stirring is continued for another 30-60 min. After the reaction is completed, the additive is obtained by filtration, washing, and drying.

[0040] Furthermore, the mass fraction of resveratrol in deionized water is 30-70%.

[0041] Furthermore, the mass fraction of the sodium hydroxide aqueous solution is 1-5%.

[0042] Another embodiment of the present invention provides a method for preparing the high-strength heavy metal adsorbent for soft soil solidification described in the above embodiments, comprising the following steps: Weigh steel slag, blast furnace slag, cement, fly ash, potassium humate, silane coupling agent, and additives, and mix them evenly at room temperature to obtain a soft soil solidifying agent.

[0043] In some embodiments, the preparation method of the above-mentioned high-strength heavy metal adsorbent for soft soil solidification specifically includes the following steps: Weigh out 20-75 parts steel slag, 10-60 parts blast furnace slag, 5-45 parts cement, 10-45 parts fly ash, 0.5-3 parts potassium humate, 2-15 parts silane coupling agent, and 1-9 parts additives by weight, mix them evenly, and the soft soil solidification agent is obtained.

[0044] Another embodiment of the present invention also provides the application of the high-strength heavy metal adsorption soft soil solidifier or the preparation method of the soft soil solidifier in any of the above embodiments in soil improvement, wherein the soft soil solidifier is mixed in soft soil and the mass ratio of the soft soil solidifier to the soft soil is 1:(1-4).

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention are described in further detail below. Unless otherwise specified, the raw materials used in the following embodiments are all commercially available products, the reagents are analytical grade reagents, and the steel slag and ore slag raw materials are both sourced from Maanshan Iron & Steel Co., Ltd., and are obtained after grinding and sieving.

[0046] Example 1 This embodiment provides a high-strength heavy metal adsorbent for solidifying soft soil, which is prepared as follows: 47.5 parts steel slag, 37 parts blast furnace slag, 26.3 parts cement, 29 parts fly ash, 1.8 parts potassium humate, 9.1 parts KH550, and 4.4 parts admixture are mixed evenly. The calculated mass ratio of KH550 to admixture is 2.07:1.

[0047] The preparation method of the additive includes: dispersing 17 parts of resveratrol in 50 parts of deionized water, adjusting the pH of the reaction system to 9 with a 3% sodium hydroxide aqueous solution, adding 19 parts of diketene dropwise at a uniform rate while stirring at 40°C for 15 minutes, and then continuing to stir for 45 minutes. After the reaction is completed, the additive is obtained by filtration, washing, and drying. The calculated mass ratio of resveratrol to diketene is 1:1.12.

[0048] Example 2 This embodiment provides a high-strength heavy metal adsorbent for solidifying soft soil, which is prepared as follows: 27 parts steel slag, 21 parts blast furnace slag, 15 parts cement, 16.4 parts fly ash, 1.1 parts potassium humate, 5 parts KH550, and 2.7 parts admixture are mixed evenly. The calculated mass ratio of KH550 to admixture is 1.85:1.

[0049] The preparation method of the additive includes: dispersing 11 parts of resveratrol in 30 parts of deionized water, adjusting the pH of the reaction system to 8 with a 3% sodium hydroxide aqueous solution, adding 11 parts of diketene dropwise at a uniform rate while stirring at 30°C for 10 min, and then continuing to stir for 30 min. After the reaction is completed, the additive is obtained by filtration, washing, and drying. The calculated mass ratio of resveratrol to diketene is 1:1.00.

[0050] Example 3 This embodiment provides a high-strength heavy metal adsorbent for solidifying soft soil, which is prepared as follows: 63.5 parts steel slag, 49.5 parts blast furnace slag, 35.3 parts cement, 38.8 parts fly ash, 2.2 parts potassium humate, 12.7 parts KH550, and 5.4 parts admixture are mixed evenly. The calculated mass ratio of KH550 to admixture is 2.35:1.

[0051] The preparation method of the additive includes: dispersing 26 parts of resveratrol in 70 parts of deionized water, adjusting the pH of the reaction system to 10 with a 3% sodium hydroxide aqueous solution, and adding 32 parts of diketene dropwise at a uniform rate while stirring at 50°C for 30 min. Stirring is then continued for 60 min. After the reaction is complete, the additive is obtained by filtration, washing, and drying. The calculated mass ratio of resveratrol to diketene is 1:1.23.

[0052] Example 4 This embodiment provides a high-strength heavy metal adsorbent for solidifying soft soil, which is prepared as follows: 27 parts steel slag, 21 parts blast furnace slag, 15 parts cement, 16.4 parts fly ash, 1.1 parts potassium humate, 5 parts KH550, and 2.7 parts admixture are mixed evenly. The calculated mass ratio of KH550 to admixture is 1.85:1.

[0053] The preparation method of the admixture is basically the same as that in Example 2, except that 8 parts of resveratrol and 14 parts of diketene are used. The calculated mass ratio of resveratrol to diketene is 1:1.75.

[0054] Example 5 This embodiment provides a high-strength heavy metal adsorbent for solidifying soft soil, which is prepared as follows: 27 parts steel slag, 21 parts blast furnace slag, 15 parts cement, 16.4 parts fly ash, 1.1 parts potassium humate, 5 parts KH550, and 2.7 parts admixture are mixed evenly. The calculated mass ratio of KH550 to admixture is 1.85:1.

[0055] The preparation method of the admixture is basically the same as that in Example 2, except that 14 parts of resveratrol and 8 parts of diketene are used. The calculated mass ratio of resveratrol to diketene is 1:0.57.

[0056] Example 6 This embodiment provides a high-strength heavy metal adsorbent for solidifying soft soil, which is prepared as follows: 27 parts steel slag, 21 parts blast furnace slag, 15 parts cement, 16.4 parts fly ash, 1.1 parts potassium humate, 4 parts KH550, and 3.7 parts admixture are mixed evenly. The calculated mass ratio of KH550 to admixture is 1.08:1.

[0057] The preparation method of the additive is the same as in Example 2.

[0058] Example 7 This embodiment provides a high-strength heavy metal adsorbent for solidifying soft soil, which is prepared as follows: 27 parts steel slag, 21 parts blast furnace slag, 15 parts cement, 16.5 parts fly ash, 1 part potassium humate, 6.2 parts KH550, and 1.5 parts admixture are mixed evenly. The calculated mass ratio of KH550 to admixture is 4.13:1.

[0059] The preparation method of the additive is the same as in Example 2.

[0060] Comparative Example 1 This comparative example provides a soft soil stabilizer, which is prepared as follows: 27 parts steel slag, 21 parts blast furnace slag, 15 parts cement, 16.4 parts fly ash, 1.1 parts potassium humate, 5 parts KH550 and 2.7 parts admixture are mixed evenly.

[0061] The preparation method of the admixture is basically the same as that in Example 2, except that 11 parts of phloroglucinol are used instead of 11 parts of resveratrol to prepare the admixture.

[0062] Comparative Example 2 This comparative example provides a soft soil stabilizer, the preparation method of which is basically the same as that of Example 2, except that no additives are used in the raw materials.

[0063] The specific chemical composition of the steel slag and mineral slag used in the above Examples 1-7 and Comparative Examples 1-2 is shown in Tables 1 and 2 below.

[0064] Table 1 Chemical composition of steel slag

[0065] Table 2 Chemical composition of slag

[0066] Application examples A sample of dried silt from a river in a certain area of ​​Suzhou was taken as soft soil. The silt had a moisture content of 25%. The curing agents prepared in Examples 1-7 and Comparative Examples 1-2 were added to the silt, with a mass ratio of curing agent to silt of 1:2.3. The samples were then molded into Φ50mm×H100mm blanks, demolded, and cured for 28 days at a temperature of 25±2℃ and a humidity of 95±2% to obtain soft soil test blocks 1-9. Soft soil test blocks 1-7 were obtained using the additives from Examples 1-7, while soft soil test blocks 8-9 were obtained using the additives from Comparative Examples 1-2.

[0067] Performance tests were conducted on soft soil specimens 1-9: Mechanical property test: The compressive strength of soft soil test blocks 1-9 was measured according to GB / T21144-2007 "Solid Concrete Bricks" at curing times of 7d, 14d and 28d. The test results are shown in Table 3. Heavy metal leaching test: Crushed soft soil test blocks 1-9 were subjected to toxicity leaching according to HJ / T299-2007 "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method". The test results are shown in Table 4.

[0068] Table 3 Mechanical properties of soft soil test blocks

[0069] Table 4 Heavy metal leaching content of soft soil test blocks

[0070] Analyzing the data in Tables 3 and 4, it can be seen from the soft soil test blocks 1-3 that when the mass ratio of silane coupling agent to admixture is (1.8-2.4):1 and the mass ratio of resveratrol to diketene is 1:(1-1.3), the soft soil test blocks simultaneously possess good mechanical properties and heavy metal ion complexing ability.

[0071] Compared with soft soil specimen 2, soft soil specimen 4 has similar mechanical properties and heavy metal ion complexation capacity. It can be seen that the excessive use of diketene in the preparation of the admixture did not bring about a more significant performance improvement effect to the soft soil specimen.

[0072] Compared with soft soil specimen 2, the mechanical properties of soft soil specimen 5 decreased, but the complexing ability of heavy metal ions increased. The reason may be that: the amount of diketene used in the admixture of Example 5 was less, which may have resulted in less acetoacetic acid groups generated on the admixture, thus reducing the density of the crosslinking network constructed with KH550 and failing to effectively diffuse external stress, thus reducing the mechanical properties of the soft soil specimen; however, the reduced amount of diketene resulted in more active hydroxyl groups in the crosslinking network, which can complex heavy metal ions, thus reducing the amount of heavy metal ion leaching.

[0073] Compared with soft soil specimen 2, the mechanical properties of soft soil specimen 6 have decreased. This may be because the amount of KH550 in the curing agent system of Example 6 has been reduced, which may affect the long chain structure in the crosslinking network, resulting in a reduction in the stress dispersion path and thus a deterioration in the mechanical properties of the soft soil specimen.

[0074] Compared with soft soil specimen 2, the mechanical properties of soft soil specimen 7 decreased. This may be because the amount of admixture in the curing agent of Example 7 was less, which led to a decrease in the number and density of benzene ring-benzene ring structures in the crosslinking network, affecting the rapid dissipation of external stress. It can be seen that even though KH550 can provide good inorganic powder bonding strength, the lack of admixture synergy will still lead to a decrease in mechanical properties.

[0075] Compared with soft soil specimen 2, the mechanical properties of soft soil specimen 8 decreased. The reason may be that the admixture used in soft soil specimen 8 is the same as that prepared in Comparative Example 1, which uses phloroglucinol instead of resveratrol. Due to steric hindrance, the grafting rate of phloroglucinol and diketene may be reduced, resulting in less acetoacetic acid group formation. This leads to a lower density of the crosslinking network constructed with KH550, and the aggregation point at the long chain intersection has only one benzene ring, lacking a benzene ring-to-benzene ring distribution path, which in turn affects the stress buffering capacity of the crosslinking network. Therefore, the mechanical properties of the resulting soft soil specimen are worse.

[0076] Compared with soft soil specimen 2, the mechanical properties of soft soil specimen 9 decreased. This may be because no admixture was used in the system, so it could not bond with KH550. The system did not form a cross-linked network with benzene ring-benzene ring structure as the distribution point, which resulted in a significant reduction in the dispersion path of external stress, thus causing a significant decrease in its mechanical properties.

[0077] Although the preferred embodiments of the present invention have been disclosed above, they are not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A high-strength heavy metal adsorbent for solidifying soft soil, characterized in that, The raw materials for preparing the soft soil stabilizer, by weight, include 20-75 parts steel slag, 10-60 parts blast furnace slag, 5-45 parts cement, 10-45 parts fly ash, 0.5-3 parts potassium humate, 2-15 parts silane coupling agent, and 1-9 parts admixture; the raw materials for preparing the admixture include 5-30 parts resveratrol and 5-36 parts diketene.

2. The high-strength heavy metal adsorption soft soil solidification agent according to claim 1, characterized in that, By weight, the raw materials for preparing the soft soil stabilizer include 27-64 parts steel slag, 20-50 parts blast furnace slag, 15-36 parts cement, 15-40 parts fly ash, 1-2.5 parts potassium humate, 5-13 parts silane coupling agent, and 2-6 parts admixture; the raw materials for preparing the admixture include 8-26 parts resveratrol and 8-32 parts diketene.

3. The high-strength heavy metal adsorption soft soil solidification agent according to claim 1, characterized in that, The steel slag has an average particle size of 1-30 μm; the blast furnace slag has an average particle size of 1-25 μm; the fly ash has an average particle size of 2-24 μm; and the mass ratio of the silane coupling agent to the additive is (1-5):

1.

4. The high-strength heavy metal adsorption soft soil solidification agent according to claim 1, characterized in that, The steel slag has an average particle size of 5-20 μm; the blast furnace slag has an average particle size of 3-19 μm; the fly ash has an average particle size of 5-17 μm; and the silane coupling agent is selected from any one of KH540, KH550, KH602, and KH792.

5. The high-strength heavy metal adsorption soft soil solidification agent according to claim 1, characterized in that, The mass ratio of resveratrol to diketene is 1:(0.5-1.8); preferably, the mass ratio of resveratrol to diketene is 1:(1-1.3).

6. The high-strength heavy metal adsorption soft soil solidification agent according to claim 1, characterized in that, The preparation steps of the admixture are as follows: Resveratrol was dispersed in deionized water, the reaction system was adjusted to alkaline, the temperature was raised, diketene was added, and the mixture was stirred until the reaction was completed. After filtration, washing, and drying, the additive was obtained.

7. The high-strength heavy metal adsorbent for soft soil solidification according to claim 1, characterized in that, The preparation steps of the admixture are as follows: Resveratrol was dispersed in deionized water, and the pH of the reaction system was adjusted to 8-10 with sodium hydroxide aqueous solution. Diketene was added dropwise at a constant rate while stirring at a temperature of 25-60℃ for 10-30 min. Then, stirring was continued for another 30-60 min. After the reaction was completed, the additive was obtained by filtration, washing, and drying.

8. The high-strength heavy metal adsorbent for soft soil solidification according to claim 7, characterized in that, In the preparation step of the additive, the resveratrol has a mass fraction of 30-70%; the sodium hydroxide aqueous solution has a mass fraction of 1-5%.

9. A method for preparing a high-strength heavy metal adsorbent for soft soil solidification as described in any one of claims 1-8, characterized in that, Includes the following steps: Weigh steel slag, blast furnace slag, cement, fly ash, potassium humate, silane coupling agent and additives, mix them evenly to obtain the soft soil solidifying agent.

10. The application of a high-strength heavy metal adsorbent for soft soil solidification as described in any one of claims 1-8, or a method for preparing the soft soil solidification agent as described in any one of claims 9, in soil improvement, characterized in that... The mass ratio of soft soil stabilizer to soft soil is 1:(1-4).

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