Composite fluid material for stabilizing disturbed zone soil and method of soil treatment

Abstract

The application belongs to the technical field of soil remediation, and discloses a composite fluid material for stabilizing disturbed soil and a soil treatment method, characterized in that the composite fluid material comprises the following components: a composite liquid of a modified polysilicate solution and a biodegradable polylactic acid microemulsion, chemically modified cellulose short fiber material, a high molecular polymer, a non-ionic surfactant, a calcium chloride aqueous solution, a microbial agent and a composite mineral nutrient mixture, and water. Through deep penetration and three-dimensional consolidation mechanism of the composite fluid material, a continuous consolidation layer with high toughness and high shear strength is formed, which effectively resists raindrop impact and runoff scouring, avoids cracking and peeling of the surface crust and loss of the underlying soil; the combination of the biodegradable polylactic acid microemulsion, the slow-release microbial agent and the composite mineral nutrient provides immediate protection and continuously improves the soil physical and chemical properties and biological activity during the material degradation process.

Description

Technical Field

[0001] This invention belongs to the field of soil remediation technology, and specifically relates to a composite fluid material and soil treatment method for stabilizing soil in disturbed areas. Background Technology

[0002] Soil erosion is a particularly prominent issue during landscape restoration in rocky hill areas and construction work around reservoirs, especially in ecologically sensitive rocky hill areas and around water sources such as reservoirs and lakes. The impact of construction disturbance on the surface is particularly significant. Exposed slopes after construction are washed into reservoirs by rainwater, resulting in turbid water, damaged ecological functions, and serious threats to the surrounding environment. Therefore, rapid and effective stabilization treatment of disturbed exposed soil after construction is completed is of irreplaceable significance and urgent necessity to prevent soil erosion, protect water quality, and maintain regional ecological balance.

[0003] Current technical measures, such as spraying chemical curing agents or laying lightweight coverings, have inherent shortcomings in terms of the composition of curing agents and the structural strength, depth of bonding with the soil, and durability of lightweight coverings. They are also costly and unreliable. Developing a comprehensive soil and water conservation method that can quickly stabilize exposed soil in construction-disturbed areas, effectively resist erosion from sudden heavy rainfall, and offer advantages such as simplified construction processes and significant cost-effectiveness has become a key challenge and an urgent technical problem for those skilled in the art. Therefore, we propose a composite fluid material and soil treatment method for stabilizing soil in disturbed areas to address these issues. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a composite fluid material and a soil treatment method for stabilizing soil in disturbed areas, which solves the shortcomings of traditional treatment methods in terms of structural strength, soil structure depth, and durability.

[0005] This invention is achieved through the following scheme: a composite fluid material for stabilizing soil in disturbed areas, comprising the following components: a composite liquid of modified polysilicate solution and biodegradable polylactic acid microemulsion with a volume mixing ratio of 3:1-5:1; 0.8%-1.5% of chemically modified short cellulose fiber material; 0.1%-0.3% of high molecular weight polymer; 0.05%-0.1% of nonionic surfactant; 5%-10% of calcium chloride aqueous solution by mass of the composite liquid of modified polysilicate solution and biodegradable polylactic acid microemulsion; 0.02%-0.05% of microbial agent and composite mineral nutrient mixture; and water for controlling the solid content of the composite fluid material within the range of 12%-18%.

[0006] A further improvement of the composite fluid material of the present invention for stabilizing soil in disturbed areas is that the modified polysilicate solution is a potassium silicate-based solution, and the potassium silicate-based solution contains... and The molar ratio is controlled between 2.8 and 3.2, the solid content of the potassium silicate-based solution is 35%-40%, and the dynamic viscosity of the potassium silicate-based solution at 25°C is 200 mPa·s-350 mPa·s.

[0007] A further improvement of the composite fluid material of the present invention for stabilizing soil in disturbed areas is that the biodegradable polylactic acid microemulsion has a solid content of 25%-30%, an average particle size of 80nm-120nm, and a glass transition temperature of 0℃-5℃.

[0008] A further improvement of the composite fluid material for stabilizing disturbed soil in this invention is that the chemically modified cellulose short fiber material has a length of 1mm-2.5mm, an average diameter of 15um-25um, a Young's modulus greater than 10GPa, and a tensile strength greater than 500MPa.

[0009] A further improvement of the composite fluid material of the present invention for stabilizing soil in disturbed areas is that the polymer is hydroxypropyl methylcellulose ether or xanthan gum derivative.

[0010] A further improvement of the composite fluid material of the present invention for stabilizing soil in disturbed areas is that the concentration of the calcium chloride aqueous solution is 12%-18%.

[0011] A further improvement of the composite fluid material for stabilizing soil in disturbed areas in this invention is that the microbial agent includes strains of Bacillus and Pseudomonas, wherein the viable count of each strain of Bacillus and Pseudomonas is not less than 10^8 CFU / g and the average particle size is 30um-60um.

[0012] A further improvement of the composite fluid material of the present invention for stabilizing soil in disturbed areas is that the composite mineral nutrients include potassium dihydrogen phosphate, ammonium nitrate and trace element chelate salts.

[0013] A soil treatment method includes the following steps: S1. Provide the composite fluid material as described above; S2. Spray the composite fluid material into the soil.

[0014] A further improvement of the soil treatment method of the present invention is that, before performing step S2, a spraying device is provided, the composite fluid material is put into the spraying device, and during the performance of step S2, the composite fluid material is uniformly sprayed into the soil using the spraying device.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention forms a continuous consolidated layer with high toughness and high shear strength through deep penetration and three-dimensional consolidation mechanism of composite fluid materials, which effectively resists raindrop impact and runoff erosion, avoids cracking and peeling of surface crust and loss of underlying soil, and solves the problem of rapid failure of existing soil stabilization methods under extreme rainfall conditions.

[0016] 2. The combination of biodegradable polylactic acid microemulsion, slow-release microbial agents, and compound mineral nutrients in this invention not only provides immediate protection, but also continuously improves the physical and chemical properties and biological activity of the soil during the material degradation process. This provides favorable conditions for the long-term restoration of vegetation and the self-repair of the ecosystem, achieving an organic unity of engineering protection and ecological restoration, and enhancing the long-term ecological benefits of soil stabilization treatment.

[0017] 3. The consolidation layer formed by the present invention is not completely impermeable, but maintains moderate permeability. This characteristic allows rainwater to slowly seep into the deep soil layer to replenish groundwater, while effectively intercepting soil particles and preventing fine particles from being lost with runoff, thus achieving a balance between soil and water conservation and water resource conservation. Detailed Implementation

[0018] To address the shortcomings of traditional treatment methods in terms of structural strength, soil structure depth, and durability, this invention provides a composite fluid material and soil treatment method for stabilizing soil in disturbed areas. Specific embodiments are described below to further illustrate this composite fluid material and soil treatment method for stabilizing soil in disturbed areas.

[0019] A composite fluid material for stabilizing soil in disturbed areas comprises the following components: a composite liquid of modified polysilicate solution and biodegradable polylactic acid microemulsion with a volume mixing ratio of 3:1-5:1; 0.8%-1.5% of chemically modified short cellulose fiber material; 0.1%-0.3% of polymer; 0.05%-0.1% of nonionic surfactant; 5%-10% of calcium chloride aqueous solution by mass of the composite liquid of modified polysilicate solution and biodegradable polylactic acid microemulsion; 0.02%-0.05% of a mixture of microbial agent and composite mineral nutrients; and water for controlling the solid content of the composite fluid material within the range of 12%-18% (the amount of water added is to control the solid content of the composite fluid material within the range of 12%-18%).

[0020] Through the deep penetration and three-dimensional consolidation mechanism of the aforementioned composite fluid material, a continuous consolidation layer with high toughness and high shear strength is formed, effectively resisting raindrop impact and runoff erosion, avoiding cracking and peeling of the surface crust and loss of the underlying soil, and solving the problem of rapid failure of existing soil stabilization methods under extreme rainfall conditions. The combination of biodegradable polylactic acid microemulsion with slow-release microbial agents and composite mineral nutrients not only provides immediate protection, but also continuously improves the soil's physical and chemical properties and biological activity during the material degradation process, providing favorable conditions for long-term vegetation recovery and ecosystem self-repair, achieving an organic unity of engineering protection and ecological restoration, and enhancing the long-term ecological benefits of soil stabilization treatment. The formed consolidation layer is not completely impermeable, but maintains moderate permeability in the range of 10^-5 cm / s to 10^-6 cm / s. This characteristic allows rainwater to slowly infiltrate into the deep soil layer to replenish groundwater, while effectively intercepting soil particles and preventing fine particles from being lost with runoff, thus achieving a balance between soil and water conservation and water resource conservation.

[0021] The modified polysilicate solution is a potassium silicate-based solution, and the potassium silicate-based solution contains... and The molar ratio is controlled between 2.8 and 3.2, the solid content of the potassium silicate-based solution is 35%-40%, and the dynamic viscosity of the potassium silicate-based solution at 25°C is 200 mPa·s-350 mPa·s.

[0022] By adopting the above design, potassium silicate-based solutions are used to form polysilicic acid structures with different molecular weights, thereby changing the viscosity, film-forming properties, and adhesion of the solution, which can better solidify loose soil.

[0023] The biodegradable polylactic acid microemulsion has a solid content of 25%-30%, an average particle size of 80nm-120nm, and a glass transition temperature of 0℃-5℃.

[0024] By adopting the above design, the material is ensured to form a consolidated matrix with high initial strength and good toughness after infiltration, while also taking into account environmental biodegradability. The flexible bonding matrix formed by polylactic acid and polysilicate results in a treatment layer with significantly enhanced tensile and shear strength. Its compressive strength can reach 2.0 MPa to 4.0 MPa after complete curing. Under simulated runoff conditions, the critical shear stress can be increased by 5 to 10 times, and the soil loss rate is reduced by more than 90% compared to untreated soil. This enables the treatment layer to effectively resist the impact kinetic energy of high-intensity, high-equivalent raindrops and the shear force of high-velocity runoff.

[0025] The chemically modified cellulose short fiber material has a length of 1mm-2.5mm, an average diameter of 15um-25um, a Young's modulus greater than 10GPa, and a tensile strength greater than 500MPa.

[0026] By adding chemically modified cellulose short fiber materials, a three-dimensional network structure is formed during the curing process, which effectively inhibits cracking of the cured layer and improves its tensile strength and shear strength, thereby enhancing the overall toughness and erosion resistance of the solidified body.

[0027] The polymer is hydroxypropyl methylcellulose ether or xanthan gum derivative.

[0028] By adopting the above design, the composite fluid material is endowed with thixotropic properties, that is, it maintains a high viscosity in a static state to prevent excessive penetration and loss, while the viscosity decreases rapidly under shear action (such as during spraying) to achieve good atomization and uniform spraying.

[0029] The concentration of the calcium chloride aqueous solution is 12%-18%.

[0030] By reacting the calcium chloride aqueous solution with the modified polysilicate solution and the biodegradable polylactic acid microemulsion during mixing, the gelation of polysilicate and the cross-linking and solidification of polylactic acid microemulsion are triggered, achieving rapid coagulation. Furthermore, the amount of calcium chloride aqueous solution added can be precisely adjusted according to the required initial coagulation time and ambient temperature.

[0031] The microbial agent includes strains of Bacillus and Pseudomonas, wherein the viable count of each strain of Bacillus and Pseudomonas is not less than 10^8 CFU / g and the average particle size is 30um-60um.

[0032] Furthermore, the microbial agent is a mixed strain in a dry dormant state, containing Bacillus and Pseudomonas strains with nitrogen-fixing, phosphorus-solubilizing, and potassium-solubilizing functions; sustained release is achieved through microencapsulation technology.

[0033] The complex mineral nutrients include potassium dihydrogen phosphate, ammonium nitrate, and trace element chelate salts.

[0034] Slow-release microbial agents and mineral nutrients can continuously activate soil biological activity, promote the formation of soil aggregates, improve soil fertility, and provide an excellent growing environment for subsequent natural vegetation restoration or artificial sowing. This achieves a seamless transition from temporary protection to ecological restoration and has long-term ecological benefits.

[0035] A soil treatment method includes the following steps: S1. Provide the composite fluid material as described above; S2. Spray the composite fluid material into the soil.

[0036] Before performing step S2, the exposed soil in the construction disturbance area is initially leveled, and large stones, vegetation residues and other debris are removed. After performing step S2, the soil is cured for 6-12 hours.

[0037] Before performing step S2, a spraying device is provided, the composite fluid material is put into the spraying device, and during the execution of step S2, the composite fluid material is evenly sprayed into the soil using the spraying device.

[0038] The spraying device includes a mobile platform, a material tank, a stirring mechanism, and a spraying assembly. The material tank is fixed on the mobile platform and is used to store the composite fluid material. The stirring mechanism is connected inside the material tank and is used to stir and mix the composite fluid material. The spraying assembly is connected to the material tank. During step S2, the mobile platform is controlled to move along the construction disturbance area, while the spraying assembly is controlled to extract the composite fluid material in the tank and spray it evenly into the soil.

[0039] Furthermore, the spraying device also includes a high-precision mixing system and an intelligent control unit. The high-precision mixing system is installed on the material tank and includes a metering pump for metering the amount of raw materials put into the material tank, thereby accurately controlling the ratio between the raw materials. The spraying assembly includes a high-pressure delivery pump set and an adjustable spraying module. The high-pressure delivery pump set consists of a set of wear-resistant and corrosion-resistant hydraulically driven plunger pumps or positive displacement pumps, capable of handling high-solids-content and fiber-reinforced fluids. The rated flow rate of the high-pressure delivery pump set is from 20 L / min to 120 L / min, and the rated output pressure is from 1.0 MPa to 2.5 MPa. The high-pressure delivery pump set is equipped with pressure and flow sensors to monitor and feed back operating parameters to the intelligent control unit in real time. The adjustable spraying module consists of a set of parallel fan-shaped or conical nozzles made of tungsten carbide or ceramic to improve wear resistance. Each nozzle has a spray angle of 65° to 80°, a flow rate of 5 L / min to 15 L / min, and can be vertically adjusted within a height range of 0.8 meters to 2.0 meters, and pitched within a range of ±15° to adapt to different slope terrains. The spacing between nozzles is adjustable, ensuring that the spray width is continuously adjustable within the range of 2.0 meters to 6.0 meters, and the uniformity of spray coverage is better than 90%. The spraying module integrates a wind speed sensor and a laser rangefinder to acquire ambient wind speed and the distance between the nozzle and the ground surface in real time, and transmits the data to the intelligent control unit. The core of the intelligent control unit is an industrial-grade programmable logic controller (PLC), equipped with a high-performance central processing unit and abundant analog / digital I / O interfaces. The PLC communicates bidirectionally with the actuators of various sensors, metering pumps, delivery pump sets, and spraying modules via a data bus. Input data to the control unit includes: real-time location information provided by the GNSS (Global Navigation Satellite System) module integrated into the mobile platform; slope angle and vehicle attitude information provided by the multi-axis inertial measurement unit (IMU); and environmental and equipment operating parameters provided by the aforementioned wind speed sensors, laser rangefinders, flow sensors, and pressure sensors. The PLC runs an adaptive control algorithm that dynamically adjusts the speed of the metering pump, the pressure and flow rate of the delivery pump set, and the nozzle height and angle of the spraying module based on the real-time input data to ensure that the spray thickness, coverage uniformity, and penetration depth of the composite fluid material meet preset targets under different terrain and environmental conditions. The intelligent control unit provides a graphical operation interface and real-time parameter display through a human-machine interface (HMI, 10-inch touchscreen), and also has data logging and fault diagnosis functions. The mobile platform is powered by a diesel generator set with a rated power of not less than 50 kW to ensure the system operates stably for a long time.

[0040] When spraying the composite fluid material, the target spraying volume is set via an intelligent control unit (typically 1.0 L / m² to 2.5 L / m², adjusted according to soil type, slope, and required protection level). The mobile platform moves along a predetermined path at a stable speed of 0.2 m / s to 1.0 m / s, uniformly spraying the composite fluid material onto the soil surface. The spraying pressure is adjusted to 0.8 MPa to 1.5 MPa to ensure the material evenly covers the soil surface in an atomized or fine stream form, and effectively penetrates below the soil surface through gravity, capillary action, and surface tension, relying on its own permeability.

[0041] This invention significantly optimizes the construction process and reduces overall costs. The integrated and intelligent spraying device enables precise on-site mixing and uniform, efficient spraying of materials, eliminating the need for cumbersome pretreatment and complex anchoring processes. This greatly shortens construction time, reduces labor intensity and equipment investment, thereby achieving higher economic efficiency and operability. It is particularly suitable for rapid protection needs around rocky hills and water sources with complex terrain.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] The present invention has been described in detail above with reference to the embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A composite fluid material for stabilizing soil in disturbed areas, characterized in that, The composition includes the following components: a composite liquid of modified polysilicate solution and biodegradable polylactic acid microemulsion with a volume mixing ratio of 3:1-5:1; 0.8%-1.5% of chemically modified short cellulose fiber material; 0.1%-0.3% of polymer; 0.05%-0.1% of nonionic surfactant; 5%-10% of calcium chloride aqueous solution (by mass of the composite liquid of modified polysilicate solution and biodegradable polylactic acid microemulsion); 0.02%-0.05% of microbial agent and composite mineral nutrient mixture; and water for controlling the solid content of the composite fluid material within the range of 12%-18%.

2. The composite fluid material for stabilizing soil in a disturbed zone as described in claim 1, characterized in that, The modified polysilicate solution is a potassium silicate-based solution, and the potassium silicate-based solution contains... and The molar ratio is controlled between 2.8 and 3.2, the solid content of the potassium silicate-based solution is 35%-40%, and the dynamic viscosity of the potassium silicate-based solution at 25°C is 200 mPa·s-350 mPa·s.

3. The composite fluid material for stabilizing soil in a disturbed zone as described in claim 2, characterized in that, The biodegradable polylactic acid microemulsion has a solid content of 25%-30%, an average particle size of 80nm-120nm, and a glass transition temperature of 0℃-5℃.

4. The composite fluid material for stabilizing soil in a disturbed zone as described in claim 1, characterized in that, The chemically modified cellulose short fiber material has a length of 1mm-2.5mm, an average diameter of 15um-25um, a Young's modulus greater than 10GPa, and a tensile strength greater than 500MPa.

5. The composite fluid material for stabilizing soil in a disturbed zone as described in claim 1, characterized in that, The polymer is hydroxypropyl methylcellulose ether or xanthan gum derivative.

6. The composite fluid material for stabilizing soil in a disturbed zone as described in claim 1, characterized in that, The concentration of the calcium chloride aqueous solution is 12%-18%.

7. The composite fluid material for stabilizing soil in a disturbed zone as described in claim 1, characterized in that, The microbial agent includes strains of Bacillus and Pseudomonas, wherein the viable count of each strain of Bacillus and Pseudomonas is not less than 10^8 CFU / g and the average particle size is 30um-60um.

8. The composite fluid material for stabilizing soil in a disturbed zone as described in claim 7, characterized in that, The complex mineral nutrients include potassium dihydrogen phosphate, ammonium nitrate, and trace element chelates.

9. A soil treatment method, characterized in that, Includes the following steps: S1. Providing the composite fluid material as described in claim 1; S2. Spray the composite fluid material into the soil.

10. The soil treatment method as described in claim 9, characterized in that, Before performing step S2, a spraying device is provided, the composite fluid material is put into the spraying device, and during the execution of step S2, the composite fluid material is evenly sprayed into the soil using the spraying device.