An ecological slope protection method based on soft soil substrate

Abstract

The present invention mainly relates to an ecological slope protection method based on a soft soil substrate, wherein the soft soil substrate comprises a main material and an auxiliary material, wherein the main material comprises soft soil, and the auxiliary material comprises rice husk ash, fly ash, palm oil fuel ash, polypropylene fiber, sucrase and fruit peel enzyme. The construction process of the present invention is as follows: a soft soil substrate made of a soft soil curing agent is applied to a traditional bare slope, wherein the soft soil curing agent comprises fly ash, rice husk ash and palm oil fuel ash, and polypropylene fiber and sucrase are added after being mixed with the soft soil. After that, the slope surface needs to be repaired and leveled, a small amount of soil layer gap is excavated on the slope surface, and the gap is filled with a soft soil curing substrate that has been prepared in a good proportion, and covered with a layer of geogrid to complete the construction of the slope protection substrate. The present invention can not only effectively recycle fly ash, rice husk ash and palm oil fuel ash, but also reduce environmental pollution, and improve the poor stability of the substrate and the poor soil in the ecological slope protection.

Description

Technical Field

[0001] The invention belongs to the technical field of slope management, soil and water conservation and ecological restoration, and mainly relates to an ecological slope protection method based on a soft soil substrate, aiming at the problem of slope management. Background Art

[0002] With the development of the power industry, the emission of fly ash has increased year by year. Fly ash is one of the industrial waste residues with the largest emission. If it is not treated, it will cause harm to human body and organisms. Rice husk ash is the main solid byproduct of rice husk energy utilization. If it is not properly treated or utilized, it will not only pollute the environment but also reduce the utilization rate of rice husk. Palm oil fuel ash is a byproduct of palm oil industry production. It has volcanic ash effect. Its volcanic ash characteristics give it great advantages in resource utilization.

[0003] At the same time, some slopes with poor soil are not conducive to plant growth. Although the ordinary imported soil layer has certain fertility and soil activity, its thickness is relatively thin, and the soil layer has the characteristics of high water content, strong compressibility, poor permeability, low shear strength, and easy to be eroded by rainwater. Therefore, it is necessary to improve, solidify and stabilize the soil. Traditional solidification technology mixes soft soil with common curing agent cement to achieve soft soil stability, but the raw materials and production process of cement production determine that cement will produce a large amount of harmful gases during the production process, including greenhouse gas carbon dioxide and toxic gas sulfur dioxide, which will cause air pollution; at the same time, the production process of cement will also consume a large amount of coal and other mineral fuels, resulting in high energy consumption, and its calcined waste residue will also pollute the soil and cause environmental pollution. Secondly, the ordinary imported soil layer does not have a good adhesion to the slope to be repaired, so that the slope substrate cannot play a stabilizing role when the plant root system is not strong. Therefore, selecting a suitable substrate and an effective use method can provide better results for slope repair projects. Summary of the invention

[0004] In order to achieve the above object, the present invention first provides a soft soil substrate based on a soft soil curing agent.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] A soft soil substrate based on a soft soil curing agent includes a main material and an auxiliary material, wherein the main material includes soft soil, the auxiliary material includes a curing agent, polypropylene fiber, sucrase and peel enzyme, and the curing agent is a ternary mixture made by mixing fully ground fly ash, rice husk ash and palm oil fuel ash in a certain proportion. Adding polypropylene fiber to the soil can improve the deformation characteristics and toughness of the soil, affect the strength performance of the soil, and improve durability. Adding sucrase can greatly improve the soil's grip on the fiber. Sucrase is a mixture of multiple enzymes produced by multiple bacterial species, and peel enzyme is a fermentation product of the peel, which can provide trace elements such as nitrogen, phosphorus and potassium for plant growth.

[0007] Furthermore, the above-mentioned soft soil substrate based on a soft soil solidifying agent, the solidifying agent includes fly ash, rice husk ash, and palm oil fuel ash, and the mass composition percentage of the solidifying agent is: fly ash 66%~75%, rice husk ash 12.5%~17%, and palm oil fuel ash 12.5%~17%.

[0008] Furthermore, in the above-mentioned soft soil substrate based on a soft soil solidifying agent, the mass ratio of the components of the solidifying agent is 70.5% of fly ash, 17% of rice husk ash, and 12.5% ​​of palm oil fuel ash.

[0009] Furthermore, in the above-mentioned soft soil substrate based on a soft soil solidifying agent, the mass ratio of the components of the solidifying agent is 66% of fly ash, 17% of rice husk ash, and 17% of palm oil fuel ash.

[0010] Furthermore, in the above-mentioned soft soil substrate based on a soft soil solidifying agent, the mass ratio of the components of the solidifying agent is 75% fly ash, 12.5% ​​rice husk ash, and 12.5% ​​palm oil fuel ash.

[0011] Furthermore, in the above-mentioned soft soil substrate based on a soft soil solidifying agent, the mass ratio of the components of the solidifying agent is 70.5% fly ash, 12.5% ​​rice husk ash, and 17% palm oil fuel ash.

[0012] Furthermore, the above-mentioned soft soil substrate based on the soft soil curing agent has a natural density of 1.81 g / cm 3 .

[0013] Furthermore, the soft soil substrate based on the soft soil curing agent is composed of 100 parts of soft soil, 8-12 parts of curing agent, 1.5-3 parts of polypropylene fiber, and 35-45 g / m2 of sucrase in soil. 3 , the soil dosage of peel enzyme is 3.5~4.5g / m 3 Preferably, by weight, the soil dosage is 100 parts of soft soil, 10 parts of curing agent, 2 parts of polypropylene fiber, and 40 g / m 3 , the soil dosage of peel enzyme is 4.0g / m3 .

[0014] Furthermore, in the above-mentioned soft soil substrate based on a soft soil solidifying agent, the fly ash is the fine ash collected after the coal incineration process of the power plant, which is Class C fly ash, the rice husk ash is the product of agricultural waste rice husk burned at a temperature of 500°C~700°C, and the amorphous silicon dioxide content is >90%, and the palm oil fuel ash is the product of palm oil burned at a temperature of 800°C~1000°C, and the incompletely burned palm oil material is removed through a 150mm sieve and fully ground.

[0015] Another object of the present invention is to provide an ecological slope protection method based on a soft soil substrate, comprising the following steps:

[0016] (1) Repair and level the bare slope surface and remove sharp protrusions;

[0017] (2) mixing a soft soil solidifying agent with soft soil to form a base material, adding polypropylene fiber, sucrase and fruit peel enzyme and stirring evenly to obtain a soft soil base material, wherein the soft soil solidifying agent includes fly ash, rice husk ash and palm oil fuel ash;

[0018] (3) Dig a triangular soil gap on the slope, with the gap pointing vertically downward, fill the gap with a soft soil base material that has been prepared in a certain proportion, and cover it with a layer of geogrid, which has protruding triangular grippers on both sides;

[0019] (4) The filled soft soil base material forms a protective layer for the slope to be repaired, and its thickness is generally 5~10cm;

[0020] (5) After the soft soil base material protective layer is formed, a pneumatic sprayer is used to sow seeds, and non-woven fabrics are covered on the slope. Water is poured thoroughly to stabilize the soft soil base material protective layer, thus completing the construction of the ecological slope protection.

[0021] Furthermore, in the above-mentioned ecological slope protection method based on soft soil substrate, the grid of the civil engineering grid is pressed on the triangular soil layer gap.

[0022] Based on the above technical solution, the advantages of the present invention are:

[0023] 1. The slope managed by the ecological slope protection method based on soft soil substrate proposed in the present invention has strong stability and can effectively ensure that the soft soil substrate plays the role of transition material in the early stage of sowing.

[0024] 2. The present invention proposes a ternary mixture made from solid waste fly ash, rice husk ash, and palm oil fuel ash. Since the density of fly ash is greater than that of rice husk ash and palm oil fuel ash, more fly ash is used in the same space, and fly ash is not easily oxidized, so the proportion of fly ash is much greater than that of rice husk ash and palm oil fuel ash. Since all three contain similar chemical elements, such as SiO2, Al2O3, Fe2O3 and other chemical components, but there are differences in physical effects, fly ash particles are finer and have stronger water absorption capacity; the inner and outer surfaces of rice husk ash are separated by a criss-cross interlayer, and the interlayer is loose honeycomb; palm oil fuel ash particles are extremely small and have low density, which can effectively fill the tiny pores between the soil and have a low water seepage rate.

[0025] 3. Fly ash belongs to the SiO2-Al2O3-CaO system in chemical composition, which can absorb ions to solidify soil. The CaO in fly ash itself can be used as a drug carrier, soil conditioner and calcium fertilizer, and CaO can react chemically with H2O to produce Ca(OH)2, reducing soil acidity; Rice husk ash contains 15 trace elements needed for rice fields, which helps promote the accelerated growth and vigorous growth of plants, and rice husk ash can also act as an insecticide. The principle is that the SiO2 in rice husk ash corrodes the waxy surface of the chest of pests, disrupting the metabolism of pests, causing the death of pests, and providing a good environment for subsequent plant planting; Palm oil fuel ash material itself contains SiO2, Al2O3, Fe2O3 and CaO, etc. The material itself has fine particles, which provides higher fluidity and lower water seepage rate for the soil, making the soil particles more compact and the plant roots more closely combined with the soil.

[0026] 4. Fly ash can produce Ca(OH)2, so its activity is stimulated and the soil solidifies. Rice husk ash has a high content of active SiO2, which can enhance the bonding between soils. Palm oil fuel ash itself has a high SiO2 content, which helps to react with Ca(OH)2, and the reaction when a large amount of calcium silicate hydrate (CSH) gel compounds are generated can improve the soil's compressive strength and reduce the calcium hydroxide content. Palm oil fuel ash itself has a low density, which reduces the soil density while increasing the soil's porosity. The three materials solidify the soil from three directions, respectively, so that the soil strength is improved in all directions.

[0027] 5. The triangular notch excavated on the slope of the present invention can create grip between the soft soil substrate layer and the excavated slope surface, and the slope is firmly embedded on the slope surface through the geogrid and the notch on the slope, so that the soft soil substrate can be effectively stabilized on the slope to prevent landslides.

[0028] 6. The soft soil substrate proposed by the present invention is added with polypropylene fiber, sucrase and peel enzyme, wherein the polypropylene fiber improves the deformation characteristics and toughness of the soil, affects the soil strength performance, and improves the durability; the sucrase can greatly improve the soil's grip on the fiber, and the sucrase is a mixture of multiple enzymes produced by multiple bacterial species; the peel enzyme can effectively improve the current situation of soil barrenness, not only can it directly provide nutrients for crops, but also can activate the potential nutrients in the soil.

[0029] 7. The present invention is simple to manufacture, low in cost, easy to obtain materials, easy to promote, can effectively utilize resources, avoid soil erosion on the slope, and has a good slope stabilization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the cross-sectional structure of the side of the ecological slope protection of the present invention;

[0031] Figure 2 It is a plan view of the slope notch and geogrid of the present invention;

[0032] Figure 3 It is a structural diagram of the geogrid of the present invention.

[0033] In the figure: 1. Soft soil substrate; 2. Gap; 3. Bare slope layer; 4. Geogrid. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with specific embodiments and drawings.

[0035] The soft soil samples used in the following examples were taken from untreated silty soft clay in Guangzhou. The basic parameters of the soil samples are shown in Table 1. The water content is above 50%, the porosity is large, the compressibility is high, the shear strength is low, and the permeability is low, which cannot meet the needs of engineering construction.

[0036] Table 1. Soft soil sample parameters

[0037]

[0038] Example 1

[0039] In this embodiment, a soft soil substrate based on a soft soil curing agent is provided. The weight of each component of the curing agent is 70.5%, 17%, and 12.5% ​​of fly ash, rice husk ash, and palm oil fuel ash. After the curing agent is mixed with the soft soil in an amount of 10% of the soft soil weight, polypropylene fiber accounting for 2% of the soft soil weight and soil in an amount of 40g / m 3 The amount of sucrase added to the soil is 4g / m 3 of peel enzymes.

[0040] Example 2

[0041] In this embodiment, a soft soil substrate based on a soft soil curing agent is provided. The weight of each component of the curing agent is 66%, 17%, and 17% of fly ash, rice husk ash, and palm oil fuel ash. After the curing agent is mixed with the soft soil in an amount of 10% of the soft soil weight, polypropylene fiber accounting for 2% of the soft soil weight and soil in an amount of 40g / m 3 The amount of sucrase added to the soil is 4g / m 3 of peel enzymes.

[0042] Example 3

[0043] In this embodiment, a soft soil substrate based on a soft soil curing agent is provided. The weight of each component of the curing agent is 75%, 12.5%, and 12.5% ​​of fly ash, rice husk ash, and palm oil fuel ash. After the curing agent is mixed with the soft soil in an amount of 10% of the soft soil weight, polypropylene fiber accounting for 2% of the soft soil weight and soil in an amount of 40g / m 3 The amount of sucrase added to the soil is 4g / m 3 of peel enzymes.

[0044] Example 4

[0045] In this embodiment, a soft soil substrate based on a soft soil curing agent is provided. The weight of each component of the curing agent is 70.5%, 12.5%, and 17% of fly ash, rice husk ash, and palm oil fuel ash. After the curing agent is mixed with the soft soil in an amount of 10% of the soft soil weight, polypropylene fiber accounting for 2% of the soft soil weight and soil in an amount of 40g / m 3 The amount of sucrase added to the soil is 4g / m 3 of peel enzymes.

[0046] Example 5

[0047] In this embodiment, a soft soil substrate based on a soft soil curing agent is provided, wherein the masses of the curing agent components are 70.5%, 12.5% ​​and 17% of fly ash, rice husk ash and palm oil fuel ash, and the curing agent is mixed with the soft soil in an amount of 10% of the mass of the soft soil.

[0048] Example 6

[0049] In this embodiment, a soft soil substrate based on a soft soil curing agent is provided, wherein the masses of the components of the curing agent are 70.5%, 12.5% ​​and 17% of fly ash, rice husk ash and palm oil fuel ash, respectively. The curing agent is mixed with the soft soil in an amount of 10% of the mass of the soft soil, and then polypropylene fibers accounting for 2% of the mass of the soft soil are added.

[0050] Example 7

[0051] In this embodiment, a soft soil substrate based on a soft soil curing agent is provided. The mass of each component of the curing agent is 70.5%, 12.5%, and 17% of fly ash, rice husk ash, and palm oil fuel ash. The curing agent is mixed with the soft soil in an amount of 10% of the mass of the soft soil, and the amount of the curing agent added to the soil is 40g / m 3 of sucrase.

[0052] The unconfined compressive strength of the soft soil substrate obtained in the above examples was evaluated. A fixed-size mold was used, with a bottom diameter of 39.1 mm and a height of 80 mm. The materials were mixed and pressed into the mold. The prepared samples were naturally cured for 1 day and then demoulded. They were then cured under standard curing conditions to the required age, and the unconfined compressive strength at 7 days and 28 days was measured. The unconfined compressive strength of each example is shown in Table 2.

[0053] Table 2: Unconfined compressive strength

[0054]

[0055] Example 8

[0056] This embodiment provides an ecological slope protection method based on soft soil substrate, such as Figure 1~2 As shown, its components mainly include: soft soil substrate 1, vertical notch of slope 2, bare slope layer to be repaired 3, geogrid 4;

[0057] The soft soil substrate 1 includes a main material and auxiliary materials, wherein the main material includes soft soil, and the auxiliary materials include rice husk ash, fly ash, palm oil fuel ash, polypropylene fiber, sucrase and fruit peel enzyme; the rice husk ash is the product of agricultural waste rice husk burned at a temperature of 500°C to 700°C, and the amorphous silicon dioxide content is >90%; the soft soil shown refers to forest soil; the curing agent is a ternary mixture of fully ground fly ash, rice husk ash, and palm oil fuel ash mixed in a certain proportion, and mixed and stirred with soft soil to form a substrate, on which polypropylene fiber, sucrase and fruit peel enzyme are added to form a soft soil substrate. In specific applications, the auxiliary materials can be packaged separately and mixed with the main materials until they are needed.

[0058] Vertical gap 2 of the slope Figure 1~2 As shown, a small amount of triangular soil gaps are excavated on the slope surface, the gaps are vertically downward, and the gaps are filled with a soft soil solidification base material that has been prepared in a certain proportion, and covered with a layer of geogrid 4 to complete the construction of the slope protection base material.

[0059] The following steps are involved:

[0060] Step 1: Repair and level the bare slope surface and remove sharp protrusions;

[0061] Step 2: Mixing a soft soil curing agent with soft soil to form a base material, and then adding polypropylene fiber, sucrase and peel enzyme and stirring evenly to obtain a soft soil base material, wherein the soft soil curing agent includes fly ash, rice husk ash and palm oil fuel ash;

[0062] Step 3: Dig a triangular soil gap on the slope, with the gap pointing vertically downward, fill the gap with a soft soil base material that has been prepared in a certain proportion, and cover it with a layer of geogrid, which has protruding triangular grippers on both sides;

[0063] Step 4: The filled soft soil base material forms a protective layer for the slope to be repaired, and its thickness is generally 5~10cm;

[0064] Step 5: After the soft soil base material protective layer is formed, use a pneumatic sprayer to sow seeds, cover the slope with non-woven fabrics, and water thoroughly to stabilize the soft soil base material protective layer to complete the construction of the ecological slope protection.

[0065] The above embodiments are merely examples of the technical solutions of the present invention. The ecological slope protection method based on soft soil substrate involved in the present invention is not limited to the above embodiments, but is subject to the scope defined in the claims. Any modification, supplement or equivalent replacement made by technicians in the field of the present invention on the basis of the embodiment is within the scope of protection claimed by the present invention.

Claims

1. A soft soil substrate based on a soft soil curing agent, characterized in that: The invention comprises a main material and auxiliary materials, wherein the main material comprises soft soil, the auxiliary materials comprise a curing agent, polypropylene fiber, sucrase and peel enzyme, the curing agent is a ternary mixture prepared by mixing fully ground fly ash, rice husk ash and palm oil fuel ash in a certain proportion; wherein the curing agent and the polypropylene fiber are added to the soft soil in an amount of 10% and 2% respectively, and the sucrase and the peel enzyme are added to the soft soil in an amount of 40 g / m 3 , 4g / m 3 The mass composition percentage of the curing agent is: fly ash 70.5%, rice husk ash 12.5%, and palm oil fuel ash 17%.

2. The soft soil substrate based on the soft soil curing agent according to claim 1, characterized in that: The natural density of the soft soil is 1.81 g / cm 3 .

3. The soft soil substrate based on the soft soil curing agent according to claim 1, characterized in that: The fly ash is the fine ash collected after the coal in the power plant is burned through the incineration process, which is Class C fly ash. The rice husk ash is the product of agricultural waste rice husk burned at a temperature of 500°C to 700°C, and the amorphous silicon dioxide content is >90%. The palm oil fuel ash is the product of palm oil burned at a temperature of 800°C to 1000°C, and the incompletely burned palm oil material is removed through a 150mm sieve and fully ground.

4. An ecological slope protection method based on a soft soil substrate, using the soft soil substrate according to any one of claims 1 to 3, characterized in that: The steps include: (1) Repair and level the bare slope surface and remove sharp protrusions; (2) mixing a soft soil solidifying agent with soft soil to form a base material, adding polypropylene fiber, sucrase and fruit peel enzyme and stirring evenly to obtain a soft soil base material, wherein the soft soil solidifying agent includes fly ash, rice husk ash and palm oil fuel ash; (3) Dig a triangular soil gap on the slope, with the gap pointing vertically downward, fill the gap with a soft soil base material that has been prepared in a certain proportion, and cover it with a layer of geogrid, which has protruding triangular grippers on both sides; (4) The filled soft soil base material forms a protective layer for the slope to be repaired, and its thickness is generally 5~10cm; (5) After the soft soil base material protective layer is formed, a pneumatic sprayer is used to sow seeds, and non-woven fabrics are covered on the slope. Water is poured thoroughly to stabilize the soft soil base material protective layer, thus completing the construction of the ecological slope protection.

5. The ecological slope protection method based on soft soil substrate according to claim 4 is characterized in that: The grid of the geogrid is pressed on the triangular soil layer gap.

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