Artificial soil with conjugated properties and its preparation method

Abstract

This application provides an artificial soil with conjugated properties and its preparation method, applicable to the field of artificial soil technology. The preparation method includes: crushing waste inorganic soil to obtain fine artificial soil matrix; mixing the fine matrix, water, and soil conditioner to obtain a soil mixture; wherein the soil conditioner includes bio-based polymer materials with surface modification functions, organic matter and mineral materials that increase soil fertility, and modifies the conjugated properties of soil such as hydrophilicity / hydrophobicity, aggregation / looseness, and water permeability / fertility retention; modifying and granulating the soil mixture in a drum to obtain artificial soil with a stable granular structure. The granular structure artificial soil prepared by this application can efficiently and quickly construct suitable soil-water-air-biological habitats for different needs, effectively solving the problems of rapid soil habitat construction and fertility maintenance, and has broad prospects in the fields of waste soil resource utilization, ecology, environment, and agriculture.

Description

Technical Field

[0001] This application relates to the field of artificial soil technology, specifically to an artificial soil with conjugate properties and its preparation method. Background Technology

[0002] The improper disposal of excavated soil from numerous production and construction projects not only wastes vast amounts of soil (rock) resources but also encroaches on significant land resources, causing environmental pollution and even leading to disasters such as landslides, mudslides, and collapses. Therefore, research on the resource utilization of excavated soil from engineering projects is essential.

[0003] Based on a statistical analysis of existing domestic and international literature, the resource utilization of excavated soil from engineering projects currently focuses on six main aspects: 1) using it as aggregate after screening and crushing; 2) processing the stones in the excavated soil to use as new wall materials; 3) using some excavated soil to make hollow bricks; 4) directly using excavated soil and slag for backfilling mine pits or mining subsidence areas; 5) using it for landscaping and micro-topographical construction; and 6) mixing excavated soil with soil conditioners and growth substrates after certain treatments to serve as "imported soil." Among these, soil improvement methods can improve and protect the soil environment, prevent pollution, maintain ecological balance, and enhance the stability and sustainability of ecosystems. However, traditional soil improvement technologies struggle to simultaneously achieve the unity of multiple opposing properties of soil, such as hydrophilicity and hydrophobicity, leading to numerous engineering failures. Therefore, developing a new type of multi-media, multi-scale artificial soil with multiple opposing properties is essential. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of this, this application provides an artificial soil with conjugated properties and a method for preparing the same, which uses soil conditioner and roller granulation technology to aggregate discrete soil particles into a multi-media, multi-scale soil aggregate structure with multiple pairs of opposing properties.

[0006] (II) Technical Solution

[0007] The embodiments in this specification provide the following technical solutions:

[0008] This specification provides an embodiment of a method for preparing artificial soil with conjugated properties, comprising the following steps:

[0009] S01, crush the waste inorganic soil generated during engineering excavation to obtain fine artificial soil matrix material;

[0010] S02, the matrix fines obtained in step S01 are mixed with water and soil conditioner to obtain a soil mixture;

[0011] S03, the soil mixture in step S02 is modified and granulated in a drum to obtain conjugated artificial soil with a stable aggregate structure;

[0012] The soil conditioner comprises bio-based polymers with surface-modifying functions, organic matter, and mineral materials that enhance soil fertility. The soil conditioner enables soil particles to fully bond, forming stable aggregate structures and creating abundant pores between aggregates. The water adsorption effect of the soil conditioner effectively locks in capillary water within the aggregates, achieving good hydrophilicity and water retention in the soil. Simultaneously, the bio-based polymers modify the surface of soil aggregates, improving soil hydrophobicity; the loose and porous structure of the organic matter further increases the porosity within the aggregates, thus achieving good permeability and aeration in the soil; the addition of organic matter and mineral materials also provides nutrients for the growth and reproduction of microorganisms in the soil. The decomposition of organic matter raises the internal temperature of the soil, and the resulting fermentation broth helps to balance the bacterial colonies within the soil, maintaining temperature stability.

[0013] The amount of soil conditioner added is 0.01‰ to 0.08‰ of the fine matrix material.

[0014] In some embodiments, the mass ratio of the bio-based polymer material, organic matter, and mineral material is 1–3:4–7:0.5–1.5.

[0015] In some embodiments, the bio-based polymeric material includes amylase, polyacrylamide, peanut shell powder, and sawdust charcoal, wherein the mass ratio of amylase, polyacrylamide, peanut shell powder, and sawdust charcoal is 2-4:0.5-1.5:13-18:1-3.

[0016] In some embodiments, the organic matter includes chicken manure or sheep manure.

[0017] In some embodiments, the mineral material includes potassium humate and lime, wherein the mass ratio of potassium humate to lime is 1:4 to 1:7.

[0018] In some embodiments, the mass ratio of the bio-based polymer material, organic matter, and mineral material is specifically 2:5:1; the mass ratio of the starch enzyme, polyacrylamide, peanut shell powder, and wood charcoal is specifically 3:1:15:2; and the mass ratio of potassium humate and lime is specifically 1:5.

[0019] In some embodiments, the higher the concentration of the soil conditioner, the slower the rate of soil moisture evaporation in the artificial soil.

[0020] In some embodiments, the surface solid-liquid contact angle and droplet profile height of the droplets formed after the artificial soil comes into contact with water are respectively proportional to the amount of soil conditioner added.

[0021] In some embodiments, the particle diameter of the matrix fines is less than 0.2 mm; the porosity of the artificial soil is 40% to 60%.

[0022] This specification also provides an artificial soil with conjugated properties, prepared based on the method for preparing artificial soil with conjugated properties described in any embodiment of this specification.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:

[0025] 1) This invention can improve the fertility of barren soil structure, which is conducive to agricultural production, ecological restoration and soil carbon sequestration capacity, and helps to achieve the "dual carbon" goal.

[0026] 2) This invention can construct soil habitats that are different from those already existing in nature, and optimize and regulate the succession and sustainable development of natural ecosystems through functions such as biological coupling, ecological conjugation and soil fertility enhancement.

[0027] 3) This invention can efficiently and quickly construct suitable soil-water-air-biological habitats (habitat is ecological environment) for different needs scenarios, and can effectively solve the problem of rapid construction of soil habitats and maintenance of fertility under complex soil-water-air-biological conditions. It has broad prospects in the fields of waste soil resource utilization, ecology, environment and agriculture. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the preparation process in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of soil aggregates in the artificial soil of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the artificial soil of the present invention;

[0032] Figure 4 This is a diagram showing the experimental test results of the stability of the conjugate soil structure in an embodiment of the present invention;

[0033] Figure 5This is a diagram showing the experimental test results of the water-holding capacity of conjugate soil in an embodiment of the present invention;

[0034] Figure 6 This is a diagram showing the droplet morphology results from the hydrophobicity test of conjugate soil in an embodiment of the present invention.

[0035] Figure 7 This is a diagram showing the experimental test results of the hydrophobicity of conjugate soil in an embodiment of the present invention;

[0036] Figure 8 This is a flowchart of the preparation method of the present invention;

[0037] In the diagram: 1-soil particles, 2-soil aggregates, 3-polyacrylamide, 4-wood chips and charcoal, 5-conjugated soil permeable and aerated structure. Detailed Implementation

[0038] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0039] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0041] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0042] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0043] Combination Figure 8 As shown in the embodiments of this specification, a method for preparing artificial soil with conjugated properties is provided, comprising the following steps:

[0044] S01, crush the waste inorganic soil generated during engineering excavation to obtain fine artificial soil matrix material;

[0045] S02, mix the matrix fines obtained in step S01 with water and soil conditioner to obtain a soil mixture;

[0046] S03, the soil mixture in step S02 is modified and granulated in a drum to obtain conjugated artificial soil with a stable aggregate structure;

[0047] The soil conditioner includes bio-based polymer materials with surface modification functions, organic matter and mineral materials that increase soil fertility; the amount of soil conditioner added is 0.01‰ to 0.08‰ of the matrix fines, preferably 0.01‰, 0.03‰, 0.05‰ and 0.08‰.

[0048] It should be noted that in this invention, the waste inorganic soil refers to engineering waste soil, and the source of the engineering waste soil is not specifically limited. Preferably, the waste inorganic soil is crushed and sieved before being mixed with the soil conditioner.

[0049] In some embodiments, the mass ratio of bio-based polymer materials, organic matter, and mineral materials is 1–3:4–7:0.5–1.5; the bio-based polymer materials include amylase, polyacrylamide, peanut shell powder, and wood charcoal, and the mass ratio of amylase, polyacrylamide, peanut shell powder, and wood charcoal is 2–4:0.5–1.5:13–18:1–3.

[0050] In some embodiments, the organic matter includes chicken manure or sheep manure.

[0051] In some embodiments, the mineral materials include potassium humate and lime; the mass ratio of potassium humate to lime is 1:4 to 1:7.

[0052] In this invention, the soil conditioner enables soil particles to fully bond together, forming a stable aggregate structure and creating a rich porous structure between the aggregates. The water adsorption effect of the soil conditioner can effectively lock in capillary water within the aggregates, achieving good hydrophilicity and water retention in the soil. Simultaneously, bio-based polymer materials can modify the surface of soil aggregates, improving soil hydrophobicity; the loose and porous structure of organic matter can further increase the porosity within the aggregates, thereby achieving good permeability and aeration in the soil; the addition of organic matter and mineral materials also provides nutrients for the growth and reproduction of microorganisms in the soil. The process of decomposing organic matter raises the internal temperature of the soil, and the generated fermentation broth can coordinate the bacterial colony balance within the soil, maintaining temperature stability.

[0053] In some embodiments, the higher the concentration of the soil conditioner, the slower the evaporation rate of soil moisture in the artificial soil; the surface solid-liquid contact angle and droplet profile height of the droplets formed after the artificial soil comes into contact with water are directly proportional to the amount of soil conditioner added, that is, the closer the amount of soil conditioner added is to 0.08‰, the larger the surface solid-liquid contact angle of the droplets formed after the artificial soil comes into contact with water, and the higher the droplet profile height.

[0054] In some embodiments, the particle diameter of the matrix fines is less than 0.2 mm; the porosity of the artificial soil is 40% to 60%.

[0055] This invention utilizes the binding effect of polyacrylamide to fully bind soil particles, forming a stable aggregate structure and creating a rich porous structure between the aggregates. Simultaneously, the loose and porous structure of sawdust charcoal further increases the porosity within the aggregates, thereby achieving good hydrophobicity, permeability, and aeration of the soil. Furthermore, the water adsorption effect of polyacrylamide effectively locks in capillary water within the aggregates, achieving good hydrophilicity and water retention in the soil. The addition of peanut shell powder, amylase, and potassium humate provides nutrients for the growth and reproduction of soil microorganisms. The decomposition of organic matter raises the internal temperature of the soil, and the resulting fermentation broth helps to balance the bacterial colonies within the soil, maintaining temperature stability. Lime serves to regulate soil pH and improve soil acid-base buffering capacity. In this invention, the soil aggregate structure possesses good water stability, mechanical stability, and hierarchical porosity, which can improve nutrient availability and acid-base buffering capacity, while simultaneously achieving the goal of saving water and fertilizer.

[0056] In this invention, artificial soil with conjugate properties is called "conjugate soil". Having conjugate properties means that conjugate soil materials can achieve the unity of opposites of multiple different properties, such as simultaneously possessing hydrophilicity and hydrophobicity, permeability and water retention, air permeability and temperature retention, etc.

[0057] This invention modifies and granulates the obtained soil mixture in a drum to obtain artificial soil with a stable aggregate structure. The modification adjusts the conjugate properties of the soil, such as hydrophilicity / hydrophobicity, aggregation / looseness, and water permeability / fertility retention.

[0058] Example 1:

[0059] like Figure 1 As shown in the figure, this embodiment describes a method for preparing a novel artificial soil with conjugated properties, the specific steps of which include:

[0060] The first step is to crush the waste inorganic soil generated during the excavation of the project to obtain fine artificial soil matrix material. Specifically, the waste inorganic soil is first put into the original soil silo using a loader, and then the waste inorganic soil is transported to the crushing system for crushing and screening. The particle diameter of the fine matrix material after screening is less than 0.2mm.

[0061] The second step involves pre-mixing the substrate fines and soil conditioner from the first step to obtain a soil mixture. Specifically, the substrate fines and soil conditioner are fed into a drum via a conveyor for thorough mixing to obtain the soil mixture. The total amount of soil conditioner added is 0.01‰ of the weight of the substrate fines. The soil conditioner consists of bio-based polymer materials, organic matter, and mineral materials in a mass ratio of 2:5:1. The bio-based polymer materials are starch enzymes, polyacrylamide, peanut shell powder, and wood charcoal in a mass ratio of 3:1:15:2. The organic matter is chicken manure or sheep manure. The mineral materials are potassium humate and lime in a mass ratio of 1:5.

[0062] The third step involves modifying and granulating the soil mixture obtained in the second step in a drum to obtain artificial soil with a stable aggregate structure, i.e., preparing a conjugate soil material with good water permeability and air permeability.

[0063] like Figure 2 As shown, discrete soil particles 1 are bound together by polyacrylamide 3 to form soil aggregates 2. The irregular interweaving of soil particles 1 provides a porous and breathable structure for soil aggregates 2, and the loose and porous structure of the wood charcoal 4 further increases the internal porosity of soil aggregates 2; Figure 3 As shown, adjacent soil aggregates 2 form a conjugate soil permeable and aerated structure 5 (the conjugate soil permeable and aerated structure 5 is the pores between soil aggregates 2, indicating that the stacked soil aggregates forming the conjugate soil have a good structure).

[0064] Example 2:

[0065] The difference from Example 1 is that the total amount of soil conditioner added is 0.03‰ of the original soil weight, and the rest is the same as in Example 1.

[0066] Example 3:

[0067] The difference from Example 1 is that the total amount of soil conditioner added is 0.05‰ of the original soil weight, and the rest is the same as in Example 1.

[0068] Example 4:

[0069] The difference from Example 1 is that the total amount of soil conditioner added is 0.08‰ of the original soil weight, and the rest is the same as in Example 1.

[0070] Example 5:

[0071] The properties of the conjugate soil materials prepared in Examples 1-4 were experimentally tested, including the structural stability and hydrophobicity of the conjugate soil materials.

[0072] (1) Structural stability of conjugate soil materials

[0073] Soil structural stability can be divided into mechanical stability and water stability. Mechanical stability is generally evaluated by measuring the mechanical stability of aggregates, while water stability is evaluated by measuring water-stable aggregates. In this embodiment, the distribution characteristics of mechanical stability and water-stable aggregates in conjugate soil materials were determined using dry sieving and wet sieving methods.

[0074] In Example 4, the particle size distribution characteristics of conjugated soil aggregates determined by dry sieving and wet sieving methods are as follows: Figure 4 As shown. From Figure 4 As can be seen, the particle size distribution of aggregates obtained by dry and wet sieving methods exhibits "single-peak" and "double-peak" distributions, respectively, but the particle size distribution of aggregates in conjugate soils under dry and wet sieving treatments shows significant differences. Figure 4 It can be seen that in the particle size distribution of air-dried agglomerates obtained by the dry sieving method, the agglomerates with a particle size of 0.25–2 mm have the highest content, accounting for more than half of all agglomerates, which is much higher than other particle size ranges, while the agglomerates with a particle size <0.054 mm have the lowest content, at only 1.63%. The contents of agglomerates with a particle size of 5–10 mm, 2–5 mm, and 0.054–0.25 mm are 14.79%, 27.76%, and 3.02%, respectively. According to the particle size, agglomerates are divided into macroagglomerates (>0.25 mm) and microagglomerates (<0.25 mm) with a particle size of 0.25 mm. According to the dry sieving results, the content of non-water-stable macroagglomerates exceeds 90%.

[0075] according to Figure 4It can be seen that in the particle size distribution measured by wet sieving, the content of aggregates with a particle size of 0.053–0.25 mm was the highest, at 27.27%, while the proportion of conjugate soil particle aggregates with a particle size >5 mm was the lowest, at 1.28%. The contents of aggregates with a size of 3–5 mm, 2–3 mm, 1–2 mm, 0.5–1 mm, 0.25–0.5 mm, and <0.053 mm were 4.49%, 3.95%, 11.84%, 16.50%, 19.46%, and 15.21%, respectively.

[0076] Soil aggregates obtained by dry and wet sieving methods are characterized by their stability using indices such as mean weight diameter (MWD), geometric mean diameter (GMD), and structural damage rate (PAD), as shown in Equations 2.1-2.3. Soil aggregates can be classified into macroaggregates and microaggregates, with those having a diameter >0.25 mm considered macroaggregates. Based on their resistance to water dispersion, macroaggregates can be further classified into water-stable and non-water-stable types. The content of water-stable macroaggregates is an important indicator for evaluating soil structural stability and is of great significance. The formulas for calculating the content of macroaggregates and water-stable macroaggregates are shown in Equations 2.4-2.5.

[0077]

[0078]

[0079] In the formula: x i The average diameter (mm) of water-stable agglomerates within any particle size range; w i For the corresponding x i The percentage of aggregates.

[0080]

[0081] In the formula: P is the mass percentage (%) of air-dried agglomerates larger than 0.25 mm; Q is the mass percentage (%) of water-stable agglomerates larger than 0.25 mm.

[0082]

[0083] In the formula: R 0.25 The content of large aggregates with a diameter greater than 0.25 mm; M T This represents the total mass of the aggregate.

[0084]

[0085] In the formula: R 0.25wet The content (by weight) of water-stable aggregates with a diameter greater than 0.25 mm.

[0086] In this specific embodiment, aggregates of conjugate soil were obtained by dry and wet sieving methods, and MWD, GMD, and R0.25 were selected as evaluation indicators for aggregate stability. The results are shown in Table 1 below. Under dry sieving, the average MWD of the aggregates was 2.68 cm and the average GMD was 1.30 cm, while under wet sieving, the average MWD was 0.79 cm and the average GMD was 0.62 cm. The larger the MWD and GMD indices, the more stable the aggregates. It can be seen that the structural stability evaluation indicators of this conjugate soil show that its aggregates have poor mechanical and water stability, but relatively high mechanical stability, that is, under a certain external force, its aggregate state can still remain stable.

[0087] Meanwhile, as shown in Table 1, the content of large aggregates measured by wet sieving was lower than that measured by dry sieving. Large aggregates can be divided into two categories: water-stable and non-water-stable. Water-stable aggregates do not easily disperse or disintegrate immediately after being soaked in water, maintaining their original structural morphology and binding capacity. The content of water-stable aggregates is one of the important indicators for evaluating soil structural stability and can be determined through wet sieving tests. The different proportions of aggregates with different particle sizes are one of the intrinsic reasons for differences in soil fertility. For example, water-stable aggregates with a diameter between 0.25 and 0.5 mm are relatively stable and contribute the most to basic soil nutrients. Therefore, soil aggregates are also an important indicator for evaluating soil fertility levels.

[0088] According to the results in Table 1, the aggregate stability evaluation of this conjugate soil shows that, under wet sieving treatment, the average content of water-stable aggregates >0.25 mm was 55.76%, and the content of water-stable aggregates between 0.25 and 0.5 mm was 19.46%. This indicates that after water soaking, the aggregates in this conjugate soil are easily dispersed and the structure is easily broken, resulting in poor resistance to water dispersion and a low capacity to supply basic soil nutrients.

[0089] Table 1. Stability index of conjugated soil aggregates under dry and wet sieving treatments.

[0090]

[0091] (2) Hydrophobicity of conjugate soil materials

[0092] Soil water retention capacity refers to the soil's ability to absorb and retain a certain amount of water. Improving soil water retention capacity is crucial for the effective use of water. Soil hydrophobicity can, to some extent, improve its physical structure, enhance water stability, effectively conserve water resources, and improve the soil pore environment.

[0093] In this embodiment, the water-holding capacity of the conjugate soil material was studied using the ring weighing method to determine the maximum capillary water holding capacity and the saturated water content of the soil. Specifically, after the soil sample absorbed moisture, it was placed in the same temperature environment (60°C) for 24 hours, and the soil was weighed every hour to determine the rate of soil moisture evaporation.

[0094] Test results are as follows Figure 5 As shown in the figure, when the capillary pores of the undisturbed soil are completely filled with water, its moisture content is 36.93%. After evaporation at a constant temperature of 60℃ for 24 hours, its moisture content decreases to 2.93%. The moisture content of the conjugate soil material changes from 38.21%–39.92% to 4.60%–8.07%. The soil moisture content change curves show that at the beginning of evaporation, the moisture content curves decrease almost parallel, indicating similar rates of soil moisture loss. Subsequently, the moisture content of the conjugate soil material decreases more slowly than that of the undisturbed soil. The figure shows that the undisturbed soil loses moisture very quickly during evaporation. The conjugate soil material can slow down the rate of evaporation, and its moisture content remains higher than that of the undisturbed soil throughout the evaporation process, although this change is not significant in the initial stages of evaporation. After 7 hours of evaporation, based on the relationship between soil moisture content and time, the moisture content of the undisturbed soil was 18.63%, which is close to the lower limit of available water in the soil. At this time, the plants cannot absorb water from the soil well, which has a negative impact on plant growth.

[0095] In contrast, conjugate soil materials can effectively suppress soil moisture evaporation during the evaporation process, thereby retaining more moisture over a longer period and improving the soil's water retention capacity. Different application concentrations of soil conditioners have varying effects on slowing down the rate of water evaporation. Generally speaking, the higher the concentration of soil conditioner, the slower the rate of soil moisture evaporation. It can be seen that soil conditioners are effective in reducing ineffective water consumption and are suitable for use in soils in water-scarce areas to improve the soil's ability to retain water.

[0096] In this embodiment, to study the hydrophobicity of the conjugate soil material, the solid-liquid contact angle between the soil surface and water before and after the application of the additive was measured using a contact angle measuring instrument, and the morphology of the droplets on the soil surface was observed, such as... Figure 6 As shown. From Figure 6 As can be seen, the outline and morphology of droplets on the conjugate soil surface are similar to those on the undisturbed soil surface, but there are some differences. Droplets on the undisturbed soil surface have a larger contact area and a lower outline height. Droplets on the conjugate soil surface have higher outline heights than those on the undisturbed soil surface, and their surface contact area is smaller. The higher the concentration of the soil conditioner, the more pronounced the change in droplet outline, with the outline height generally increasing with increasing additive concentration. At an additive concentration of 0.08‰, the droplet outline height reaches its maximum, exhibiting a hemispherical shape. Furthermore, Figure 6 and Figure 7 The change in contact angle over time is shown. When the additive concentration is 0.08‰, the contact angle is 80.8°.

[0097] Depend on Figure 7 It can be seen that a 2μm droplet takes approximately 15.5 seconds to evaporate on the undisturbed soil surface. Compared to the undisturbed soil, the conjugate soil requires a longer time to evaporate completely. The evaporation time of the conjugate soil is 19.6s–23.5s, and the time the droplet remains on the soil surface increases by 26.45%–54.61%.

[0098] Furthermore, based on the same inventive concept, embodiments of this specification also provide an artificial soil with conjugate properties, prepared by the method for preparing artificial soil with conjugate properties described in any of the foregoing embodiments.

[0099] In this specification, the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the descriptions of the embodiments described later are relatively simple, and relevant parts can be referred to the descriptions of the foregoing embodiments.

[0100] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for preparing artificial soil with conjugated properties, characterized in that, Includes the following steps: S01, crush the waste inorganic soil generated during engineering excavation to obtain fine artificial soil matrix material; S02, the matrix fines obtained in step S01 are mixed with water and a soil conditioner to obtain a soil mixture; wherein, the soil conditioner includes bio-based polymer materials with surface modification function, organic matter and mineral materials that increase soil fertility; the amount of soil conditioner added is 0.01‰~0.08‰ of the matrix fines; S03, the soil mixture in step S02 is modified and granulated in a drum to obtain conjugated artificial soil with a stable aggregate structure; The matrix fines have a particle diameter of less than 0.2 mm, and the artificial soil has a porosity of 40% to 60%. The mass ratio of the bio-based polymer material, organic matter, and mineral material is 1 to 3: 4 to 7: 0.5 to 1.

5. The bio-based polymer material includes amylase, polyacrylamide, peanut shell powder, and wood charcoal, and the mass ratio of these components is 2 to 4: 0.5 to 1.5: 13 to 18: 1 to 3. The organic matter includes chicken manure or sheep manure. The mineral material includes potassium humate and lime, and the mass ratio of potassium humate to lime is 1:4 to 1:

7. The higher the concentration of the soil conditioner, the slower the evaporation rate of soil moisture in the artificial soil. The surface solid-liquid contact angle and droplet profile height of the droplets formed after the artificial soil comes into contact with water are directly proportional to the amount of soil conditioner added. The higher the concentration of the soil conditioner, the more obvious the change in droplet profile. The profile height generally increases with the increase of the additive concentration. When the additive concentration is 0.08‰, the droplet profile height reaches its maximum value and becomes hemispherical.

2. The method for preparing artificial soil with conjugate properties according to claim 1, characterized in that, The specific mass ratio of the bio-based polymer material, organic matter, and mineral material is 2:5:1; the specific mass ratio of the starch enzyme, polyacrylamide, peanut shell powder, and wood charcoal is 3:1:15:2; and the specific mass ratio of potassium humate and lime is 1:

5.

3. An artificial soil with conjugated properties, prepared according to the method for preparing artificial soil with conjugated properties as described in claim 1 or 2.

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