A sandy ecological slope protection substrate based on EICP technology and high-calcium fly ash and its application method

Abstract

This invention discloses a sandy ecological slope protection substrate based on EICP technology and high-calcium fly ash, and its application method. High-calcium fly ash is used as the calcium source in the EICP technology, fully realizing the resource utilization of high-calcium fly ash, overcoming its poor stability problem, and utilizing its slow setting speed to provide sufficient growth time for plants in the sandy ecological slope protection substrate. The principle of separate application of calcium source and urea-urease solution is adopted, reducing application difficulty while providing sufficient hydration time for high-calcium fly ash, fully releasing calcium ions to combine with the urea-urease solution, enhancing crystallization and slope protection effects. This invention utilizes the ammonium ions generated from urea hydrolysis by urease in combination with a habitat substrate modifier to improve the alkaline environment of the sandy ecological slope protection substrate, making it relatively suitable for plant growth and accelerating the ecological slope protection process.

Description

Technical Field

[0001] This invention belongs to the field of slope ecological protection technology, specifically relating to a sandy ecological slope protection substrate based on EICP technology and high-calcium fly ash and its application method. Background Technology

[0002] With the widespread advancement of infrastructure construction projects across the country, the ecological environment along these routes has been severely damaged, resulting in large areas of bare slopes without vegetation cover. To ensure slope stability and prevent weathering and erosion of the slope's rock and soil, as well as rockfalls, engineering slope protection and / or ecological slope protection methods are necessary. However, ecological slope protection projects are often located in high mountain and hilly areas. Due to the low degree of weathering, the surrounding planting soil is mostly sandy soil with a high sand content. Sandy planting soil has large particle size, small specific surface area, and large pores, resulting in weak interlocking effect between solid particles, low cohesion, and poor erosion resistance in the prepared sandy ecological slope protection substrate. This makes it extremely prone to soil erosion and cannot meet the requirements of extensive management and long-term self-sustaining of ecological slope protection projects.

[0003] Currently, two main methods are used to address the aforementioned problems: Microbially Induced Calcite Precipitation (MICP) and Enzyme Induced Calcite Precipitation (EICP). MICP utilizes specific microorganisms to hydrolyze organic matter (such as urea). The hydrolysis products combine with calcium ions to form carbonates with binding properties, thereby binding loose, unconsolidated, or weakly consolidated particles together to form a solid mass with a certain strength. EICP, on the other hand, directly uses urease to hydrolyze urea to generate calcium carbonate to solidify the soil. Both technologies have been extensively studied and widely applied. For example, Li Huandi et al. conducted soil stabilization experiments based on the above two technologies and found that although the calcium carbonate produced by Bacillus pasteurellii and urease-induced soil stabilization has different crystal morphologies, both have good soil stabilization effects. Among them, the treatment effect of Bacillus pasteurellii is better than that of urease treatment (Li Huandi et al., Soil Stabilization Experimental Study Based on MICP and EICP Technologies); Chinese Patent CN 115032365 A discloses a soil stabilization research method and application based on improved EICP technology. Based on EICP technology, mineralizing liquid is added and carbon fiber is added to effectively enhance the soil's permeability coefficient, cohesion, density, thermal conductivity, and unconfined compressive strength; Chinese Patent CN 114752390A discloses a coastal sand stabilization reagent and method. Based on EICP technology, it eliminates a lot of bacterial cultivation work and solidifies the surface of the beach into a hard shell layer with a certain strength, improving the shear strength of the beach and increasing the overall stability of the beach. The hard shell layer has a slow-seepage effect, which is beneficial to the growth of grass seeds in the later stage of beach management.

[0004] However, current EICP technology primarily uses finished calcium chloride and calcium acetate as calcium sources for protection, which results in high costs and hinders large-scale application. High-calcium fly ash is an industrial solid waste with a high free CaO content, discharged from thermal power plants. It is typically used as a concrete admixture, but excessive free CaO causes expansion during hydration, leading to poor concrete stability and slow setting. This makes large-scale industrial utilization of high-calcium fly ash difficult, resulting in large-scale accumulation. This not only wastes resources but also poses significant challenges to environmental treatment due to the alkalinity of high-calcium fly ash itself. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a sandy ecological slope protection substrate based on EICP technology and high-calcium fly ash, along with its application method. The free CaO in the high-calcium fly ash reacts with the products of urease hydrolysis of urea to generate calcium carbonate, which stabilizes the soil and improves the stability of the slope. Simultaneously, it enables the resource utilization of the high-calcium fly ash, reducing environmental pressure.

[0006] The technical solution adopted in this invention is as follows:

[0007] This invention provides a sandy ecological slope protection substrate based on EICP technology and high-calcium fly ash, which is composed of 100-120 parts of planting soil, 40-60 parts of high-calcium fly ash, 4-6 parts of organic materials, 3-4 parts of habitat substrate conditioner, and 8-32 parts of urea-urease mixture.

[0008] Preferably, the urea-urease mixture is made by mixing urea solution and urease solution in a volume ratio of 1:1.

[0009] More preferably, the concentration of the urea solution is 0.05 mol / L, and the concentration of the urease solution is 20-60 g / L.

[0010] More preferably, the method for preparing the urease solution is to bake commercially available soybeans at 40°C for 6 hours, crush them, pass them through a 60-mesh sieve, prepare a solution at a concentration of 20-60 g / L, let it stand for 1 hour, filter it, and retain the supernatant as the urease solution.

[0011] Preferably, the planting soil is sandy planting soil.

[0012] Preferably, the high-calcium fly ash comes from a general thermal power plant, with a free calcium oxide content of 30-35%, a particle size of 10-200 mesh, a water requirement ratio of 80-100%, and a sulfur trioxide content of 15-20%.

[0013] Preferably, the organic material is one or more of pine sawdust, poplar sawdust, rice husks, corn stalks, and flax stalks, which are crushed, air-dried until the moisture content is below 10%, and then passed through a 10-mesh sieve for later use.

[0014] Preferably, the habitat substrate improver is a greening additive, which is provided by Hubei Runzhi Ecological Technology Co., Ltd., and is a product of the patent achievement transfer of Three Gorges University, with application number CN01138343.7.

[0015] This invention also provides a method for using a sandy ecological slope protection substrate based on EICP technology and high-calcium fly ash, specifically including the following steps:

[0016] (1) Prepare organic materials and mix them with sandy planting soil in a certain proportion;

[0017] (2) Mix the mixture obtained in step (1) with high-calcium fly ash and habitat substrate improver in proportion, and stir thoroughly to obtain material 1;

[0018] (3) Weigh a certain amount of water from material 1 in step (2) according to the required water content, stir it thoroughly to ensure that the water content is the same everywhere, and obtain material 2;

[0019] (4) Use a hydroseeding machine to evenly spray the material 2 obtained in step (3) onto the slope;

[0020] (5) Prepare a urease solution and mix it with a urea solution in a certain proportion to obtain a urea-urease mixture;

[0021] (6) Eight to 15 days after spraying material 2, the urea-urease mixture prepared in step (5) is poured onto the slope using an irrigation system to complete the preparation and protection of the sandy ecological slope protection substrate.

[0022] The amount of water used in step (3) is 30-40% of material 1; the amount of material 2 sprayed in step (4) is 200-280 kg / m³. 2 .

[0023] The beneficial effects of this invention are as follows:

[0024] 1. This invention utilizes EICP technology to enhance the interlocking effect between solid particles, generating a stable cementitious material that coats the soil particles. The small particles, after being coated, fill the pores of the large particles, causing the substrate to bond into a whole, thus improving the strength and water retention performance of the substrate. At the same time, by combining urease derived from legumes as a raw material, the cost and acquisition difficulty of sandy ecological slope protection substrate are reduced. The ammonium ions generated by urease hydrolyzing urea are absorbed by plants, and the ammonium ions also improve the alkaline environment of the substrate, reducing the alkaline environment caused by the addition of high-calcium fly ash to the sandy ecological slope protection substrate, making it relatively suitable for plant growth.

[0025] 2. This invention uses high-calcium fly ash as the substrate for sandy ecological slope protection, making full use of the free CaO in it without considering the impact of stability, and taking full advantage of its slow setting speed to allow plants in the sandy ecological slope protection substrate to grow fully. This provides a new ecological use for high-calcium fly ash, realizes resource utilization, and reduces environmental pressure. At the same time, the CaO in it reacts with water to form calcium hydroxide, which can play a role in binding soil particles and reducing pores, thus enhancing the strength of the substrate in the early stages before the use of EICP technology.

[0026] 3. This invention utilizes high-calcium fly ash as a calcium source, avoiding common liquid calcium sources such as CaCl2 and Ca(CH3COO)2, thus reducing the Cl- produced by CaCl2. - While it may pose a risk of corrosion to the steel reinforcement materials in soil and rock reinforced structures, it also reduces costs. Furthermore, the extensive use of high-calcium fly ash as a calcium source reduces environmental harm and meets environmental protection requirements.

[0027] 4. This invention applies materials containing high-calcium fly ash separately from urea-urease solution. On the one hand, it gives the high-calcium fly ash sufficient time for hydration, allowing it to fully release calcium ions. On the other hand, it ensures the activity of urea-urease solution, maintaining its activity and allowing it to fully combine with the released calcium ions, thereby improving the crystallization effect and strengthening the protective effect.

[0028] 5. This invention uses crushed and air-dried materials such as pine sawdust, poplar sawdust, rice husks, corn stalks, and flax stalks as organic materials, which increases soil fertility. Moreover, the organic materials hydrate quickly after application and do not become fibers, thus reducing the difficulty of spraying.

[0029] 6. The urea-urease solution in this invention is applied using an irrigation system, which reduces implementation costs and difficulty and facilitates management. Attached Figure Description

[0030] Figure 1 This is a schematic diagram illustrating the principle of using EICP technology to solidify sand particles and solid waste for slope protection in this invention. Detailed Implementation

[0031] The technical solution of the present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments. It is worth noting that the following embodiments are only preferred embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention should be determined by the contents of the claims. Modifications and substitutions made by those skilled in the art to the technical solution of the present invention without creative effort all fall within the scope of protection of the present invention.

[0032] Solution preparation:

[0033] Preparation of urease solution: Commercially available soybeans were baked at 40℃ for 6 hours, then crushed and passed through a 60-mesh sieve to obtain soybean flour. Different masses of soybean flour were dissolved in water, stirred evenly, and allowed to stand for 1 hour. The supernatant was filtered to obtain urease solutions with concentrations of 20 g / L, 40 g / L and 60 g / L.

[0034] Preparation of urea solution: Commercially available urea was dissolved in water to prepare urea solutions with concentrations of 0.05 mol / L, 0.1 mol / L and 0.15 mol / L, respectively.

[0035] Habitat substrate improver: provided by Hubei Runzhi Ecological Technology Co., Ltd., which is a product of the patent achievement transfer of Three Gorges University, with application number CN01138343.7.

[0036] In the following examples, the high-calcium fly ash was sourced from the Yunnan Kaiyuan Thermal Power Plant of Datang Group, with a free calcium oxide content of 30-35%, a particle size of 10-200 mesh, a water requirement ratio of 80-100%, and a sulfur trioxide content of 15-20%; pine sawdust, poplar sawdust, rice husks, corn stalks, and flax stalks were all commercially available products.

[0037] The slope to be protected is a mountainous area with a slope of about 45° and very little vegetation cover. Due to the excavation for road construction, the slope is severely exposed and prone to landslides, which affects the aesthetics and the landslide soil can easily cover the road. The mountainous area has sandy soil, so this method is used for slope repair.

[0038] Example 1

[0039] (1) Mix and crush rice husks, pine sawdust and corn stalks, then air-dry them until the moisture content is less than 10%, and pass them through a 10-mesh sieve to obtain organic materials for later use.

[0040] (2) Take 100kg of sandy planting soil and mix it thoroughly with 6kg of organic material obtained in step (1) to obtain a mixture;

[0041] (3) Mix the mixture with 50 kg of high-calcium fly ash and 4 kg of habitat substrate improver to obtain material 1;

[0042] (4) Add 45 kg of a fixed amount of water to material 1 and stir thoroughly to ensure that the moisture content is the same everywhere, so as to obtain material 2;

[0043] (5) Use a hydroseeding machine to evenly spray material 2 onto the slope, ensuring that the content of material 2 on the slope is 200-280 kg / m². 2 between;

[0044] (6) Take a urease solution with a concentration of 20 g / L and a urea solution with a concentration of 0.05 mol / L and mix them at a volume ratio of 1:1 to obtain a urea-urease solution;

[0045] (7) Ten days after spraying material 2, take 8L of urea-urease solution and use the irrigation system to evenly irrigate it to complete the preparation and protection of the sandy ecological slope protection substrate.

[0046] Example 2

[0047] The method and steps are the same as in Example 1, except that the concentration of urease solution in step (6) is changed to 40 g / L and the concentration of urea solution is changed to 0.1 mol / L, thus completing the preparation and protection of the sandy ecological slope protection substrate.

[0048] Example 3

[0049] The method and steps are the same as in Example 1, except that the concentration of urease solution in step (6) is changed to 60 g / L and the concentration of urea solution is changed to 0.15 mol / L, thus completing the preparation and protection of the sandy ecological slope protection substrate.

[0050] Example 4

[0051] The method and steps are the same as in Example 1, except that the concentration of urea solution in step (6) is changed to 0.1 mol / L and the amount of urea-urease solution in step (7) is changed to 16L.

[0052] Example 5

[0053] The method and steps are the same as in Example 1, except that the concentration of urease solution in step (6) is changed to 60 g / L; and the amount of urea-urease solution in step (7) is changed to 24 L, thus completing the preparation and protection of the sandy ecological slope protection substrate.

[0054] Example 6

[0055] (1) Mix and crush rice husks, pine sawdust and corn stalks, then air-dry them until the moisture content is less than 10%, and pass them through a 10-mesh sieve to obtain organic materials for later use.

[0056] (2) Take 100kg of sandy planting soil and mix it thoroughly with 6kg of organic material obtained in step (1) to obtain a mixture;

[0057] (3) Mix the mixture with 40 kg of high-calcium fly ash and 4 kg of habitat substrate improver to obtain material 1;

[0058] (4) Add 45 kg of a fixed amount of water to material 1 and stir thoroughly to ensure that the moisture content is the same everywhere, so as to obtain material 2;

[0059] (5) Use a hydroseeding machine to evenly spray material 2 onto the slope, ensuring that the content of material 2 on the slope is 200-280 kg / m². 2 between;

[0060] (6) Take a urease solution with a concentration of 60 g / L and a urea solution with a concentration of 0.05 mol / L and mix them at a volume ratio of 1:1 to obtain a urea-urease solution;

[0061] (7) Ten days after spraying material 2, take 16L of urea-urease solution and use the irrigation system to evenly irrigate it to complete the preparation and protection of the sandy ecological slope protection substrate.

[0062] Example 7

[0063] The method and steps are the same as in Example 6, except that the amount of high-calcium fly ash in step (3) is changed to 60 kg to complete the preparation and protection of sandy ecological slope protection substrate.

[0064] Example 8

[0065] The method and steps are the same as in Example 6, except that the amount of high-calcium fly ash is changed to 50 kg and the amount of habitat substrate modifier is changed to 3 kg, thus completing the preparation and protection of sandy ecological slope protection substrate.

[0066] Comparative Example 1

[0067] (1) Mix and crush rice husks, pine sawdust and corn stalks, then air-dry them until the moisture content is less than 10%, and pass them through a 10-mesh sieve to obtain organic materials for later use.

[0068] (2) Take 100 kg of sandy planting soil, 4 kg of habitat substrate improver and 6 kg of organic material obtained in step (1) and mix them thoroughly to obtain the material;

[0069] (3) Add 30 kg of water to the material and stir thoroughly to ensure the same moisture content everywhere. Then use a hydroseeding machine to evenly spray the material onto the slope, ensuring that the material content on the slope is 200-280 kg / m². 2 In between, the preparation and protective use of sandy ecological slope protection substrate were completed.

[0070] Comparative Example 2

[0071] (1) Mix and crush rice husks, pine sawdust and corn stalks, then air-dry them until the moisture content is less than 10%, and pass them through a 10-mesh sieve to obtain organic materials for later use.

[0072] (2) Take 100kg of sandy planting soil, 4kg of habitat substrate improver, 50kg of high-calcium fly ash and 6kg of organic material obtained in step (1) and mix them thoroughly to obtain the material;

[0073] (3) Add 45 kg of water to the material and stir thoroughly to ensure the same moisture content everywhere. Then use a hydroseeding machine to evenly spray the material onto the slope, ensuring that the material content on the slope is 200-280 kg / m². 2 In between, the preparation and protective use of sandy ecological slope protection substrate were completed.

[0074] Comparative Example 3

[0075] (1) Mix and crush rice husks, pine sawdust and corn stalks, then air-dry them until the moisture content is less than 10%, and pass them through a 10-mesh sieve to obtain organic materials for later use.

[0076] (2) Take 100 kg of sandy planting soil, 4 kg of habitat substrate improver and 6 kg of organic material obtained in step (1) and mix them thoroughly to obtain the material;

[0077] (3) Add 30 kg of water to the material and stir thoroughly to ensure the same moisture content everywhere. Then use a hydroseeding machine to evenly spray the material onto the slope, ensuring that the material content on the slope is 200-280 kg / m². 2 between.

[0078] (4) Take a urease solution with a concentration of 60 g / L and a urea solution with a concentration of 0.05 mol / L and mix them at a volume ratio of 1:1 to obtain a urea-urease solution; and 16 L of urea-urease solution is evenly poured into the irrigation system 10 days after spraying to complete the preparation and protection of the sandy ecological slope protection substrate.

[0079] Comparative Example 4

[0080] (1) Mix and crush rice husks, pine sawdust and corn stalks, then air-dry them until the moisture content is less than 10%, and pass them through a 10-mesh sieve to obtain organic materials for later use.

[0081] (2) Take 100kg of sandy planting soil and mix it thoroughly with 6kg of organic material obtained in step (1) to obtain a mixture;

[0082] (3) Mix the mixture with 10 kg of high-calcium fly ash and 1 kg of habitat substrate improver to obtain material 1;

[0083] (4) Add 35 kg of water to material 1 and stir thoroughly to ensure that the moisture content is the same everywhere, to obtain material 2;

[0084] (5) Use a hydroseeding machine to evenly spray material 2 onto the slope, ensuring that the content of material 2 on the slope is 200-280 kg / m². 2 between;

[0085] (6) Take a urease solution with a concentration of 10 g / L and a urea solution with a concentration of 0.02 mol / L and mix them at a volume ratio of 1:1 to obtain a urea-urease solution;

[0086] (7) Ten days after spraying material 2, take 16L of urea-urease solution and use the irrigation system to evenly irrigate it to complete the preparation and protection of the sandy ecological slope protection substrate.

[0087] Comparative Example 5

[0088] (1) Mix and crush rice husks, pine sawdust and corn stalks, then air-dry them until the moisture content is less than 10%, and pass them through a 10-mesh sieve to obtain organic materials for later use.

[0089] (2) Take 100kg of sandy planting soil and mix it thoroughly with 6kg of organic material obtained in step (1) to obtain a mixture;

[0090] (3) Mix the mixture with 100 kg of high-calcium fly ash and 10 kg of habitat substrate improver to obtain material 1;

[0091] (4) Add 60 kg of a fixed amount of water to material 1 and stir thoroughly to ensure that the moisture content is the same everywhere, so as to obtain material 2;

[0092] (5) Use a hydroseeding machine to evenly spray material 2 onto the slope, ensuring that the content of material 2 on the slope is 200-280 kg / m². 2 between;

[0093] (6) Take a urease solution with a concentration of 100 g / L and a urea solution with a concentration of 1.00 mol / L and mix them at a volume ratio of 1:1 to obtain a urea-urease solution;

[0094] (7) Ten days after spraying material 2, take 16L of urea-urease solution and use the irrigation system to evenly irrigate it to complete the preparation and protection of the sandy ecological slope protection substrate.

[0095] Result detection:

[0096] Thirty days after the preparation and protection of the sandy ecological slope protection substrate, ring samples were taken. Dry density, water retention, shear strength, and porosity were tested using standard geotechnical testing methods. Shear strength was measured under a normal stress of 100 kPa. The disintegration coefficient was measured using the freezing water disintegration method. Nutrient retention was assessed using a column leaching test. The performance and protective effect of the sandy ecological slope protection substrate were evaluated. The results are shown in Table 1.

[0097] Table 1. Performance and protective effect of sandy ecological slope protection substrates prepared with different components

[0098]

[0099]

[0100] Table 1 shows that, compared with Comparative Example 1, the sandy ecological slope protection substrate prepared by the present invention has an acceptable pH range, increased dry density by 1.13-2.26%, increased disintegration by 134.58-147.80%, increased cohesion by 49.6-102.2%, increased internal friction angle by 2.6-17.6%, increased shear strength by 37.65-61.71%, decreased porosity by 6.61-12.80%, increased water retention by 61.4-72.7%, and increased nutrient retention capacity by 125.2-186.0%. This indicates that the present invention, using a combination of EICP technology and high-calcium fly ash, can not only realize the resource utilization of high-calcium fly ash but also consolidate the slope soil together, enhance cohesion, prevent soil erosion, and maintain long-term self-sufficiency under extensive management, thus achieving effective slope protection. Comparative Example 2 did not use EICP technology, only high-calcium fly ash was added. While its disintegration coefficient, cohesion, water retention, shear strength, and nutrient retention rate significantly increased, the pH value also increased significantly, which was unfavorable for plant growth on the slope. Therefore, adding only high-calcium fly ash cannot effectively protect the slope. Comparative Example 3 did not add high-calcium fly ash, only using urea-urease for dissolution and irrigation. However, due to the scarcity of free calcium sources in nature, effective slope protection could not be achieved, indicating that EICP technology relies on the addition of exogenous calcium sources. Comparative Example 4 significantly reduced the amount of high-calcium fly ash, while Comparative Example 5 significantly increased the amount. It was found that too little high-calcium fly ash could not achieve effective protection, while too much would cause a significant increase in the pH value of the slope soil, unsuitable for plant growth, and unable to achieve the desired effect of using plants to protect the slope later.

Claims

1. A method of using a sand-based eco-protection slope substrate based on EICP and high-calcium fly ash, characterized in that: The sandy ecological slope protection substrate is composed of 100-120 parts sandy planting soil, 40-60 parts high-calcium fly ash, 4-6 parts organic materials, 3-4 parts greening additives, and 8-32 parts urea-urease mixture. The high-calcium fly ash comes from a thermal power plant, with a free calcium oxide content of 30-35%, a particle size of 10-200 mesh, a water requirement ratio of 80-100%, and a sulfur trioxide content of 15-20%. The method of use includes the following steps: (1) Prepare organic materials and mix them with sandy planting soil in a certain proportion to obtain a mixture; (2) Mix the mixture obtained in step (1) with high-calcium fly ash and greening additives in proportion, and stir thoroughly to obtain material 1; (3) Weigh a certain amount of water from material 1 in step (2) according to the required water content, stir it thoroughly to ensure that the water content is the same everywhere, and obtain material 2; (4) Use a hydroseeding machine to evenly spray the material 2 obtained in step (3) onto the slope; (5) Prepare a urease solution and mix it with a urea solution in a certain proportion to obtain a urea-urease mixture; (6) Eight to 15 days after spraying material 2, the urea-urease mixture prepared in step (5) is poured onto the slope using an irrigation system to complete the preparation and protection of the sandy ecological slope protection substrate.

2. A method of using the sand-based ecological revetment substrate based on EICP and high-calcium fly ash according to claim 1, characterized in that: The urea-urease mixture is prepared by mixing urea solution and urease solution in a volume ratio of 1:

1.

3. A method of using the EICP and high calcium fly ash based sandy eco-protection slope substrate according to claim 2, characterized in that: The concentration of the urea solution is 0.05 mol / L, and the concentration of the urease solution is 20-60 g / L.

4. The method of using a sandy ecological slope protection substrate based on EICP and high-calcium fly ash according to claim 3, characterized in that: The method for preparing the urease solution is as follows: commercially available soybeans are baked at 40°C for 6 hours, then crushed and passed through a 60-mesh sieve. The solution is prepared at a concentration of 20-60 g / L, and after standing for 1 hour, it is filtered and the supernatant is retained as the urease solution.

5. The method of using a sandy ecological slope protection substrate based on EICP and high-calcium fly ash according to claim 1, characterized in that: The organic material is one or more of the following: pine sawdust, poplar sawdust, rice husks, corn stalks, and flax stalks. After being crushed, it is air-dried until the moisture content is less than 10%, and then passed through a 10-mesh sieve for later use.

6. The method of using a sandy ecological slope protection substrate based on EICP and high-calcium fly ash according to claim 1, characterized in that: The amount of water used in step (3) is 30-40% of material 1.

7. The method of using a sandy ecological slope protection substrate based on EICP and high-calcium fly ash according to claim 1, characterized in that: The spraying amount of the material 2 in step (4) is 200-280 kg / m 2 .

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