Soil stabilization treatment method for underground water level high change area

Abstract

The invention discloses a soil stabilizing treatment method for an underground water level high-change area. The method comprises the following steps: preparing a dynamic stabilizing material containing the following components: 40-60wt% of bentonite; 10 to 20 wt% of attapulgite; 10 to 20 wt% of zeolite; 5 to 10 wt% of lignin; 5 to 10 wt% of modified nano carbonate; 1-5 wt% of a plant extract; 0.5-2 wt% of a microbial additive; mixing the dynamic stable material with the soil in the target area at the mixing depth of 10-20 cm, and compacting; according to the change condition of the underground water level, water is evenly sprayed to the surface of the mixed soil, the water amount is 100-150 L / m, and further combination of the material and the soil is promoted; spraying a layer of modified plant extract solution on the surface soil to form a temporary protective film with the thickness of 0.5-1 mm, and controlling water evaporation and runoff scouring; the dynamic response capability of water absorption expansion and water release slow release of soil is realized, the permeability resistance and compressive strength of the soil are greatly improved, and meanwhile, the construction is simple, the cost is low, and the environment-friendly performance is excellent.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil engineering, and specifically relates to a method for soil stabilization treatment in areas with high and variable groundwater levels. Background Art

[0002] In areas with high and variable groundwater levels, due to frequent fluctuations in the water level, the soil structure is extremely vulnerable to damage, leading to a series of engineering problems, such as uneven settlement of the foundation, soil collapse, soil erosion, and environmental pollution. Especially in soft soil areas and coastal tidal flats, the dynamic fluctuations of groundwater cause drastic changes in soil moisture and pore water pressure, further weakening the bearing capacity and anti-seepage ability of the soil.

[0003] Currently, commonly used soil stabilization treatment techniques include traditional cement grouting and chemical grouting, but these methods have obvious limitations: Traditional cement grouting method: By injecting cement slurry to fill soil pores, enhancing the compressive strength and compactness of the soil.

[0004] Defects: It cannot adapt to changes in the groundwater level and lacks the ability to regulate water absorption and water release. The anti-seepage performance is limited, and long-term water level fluctuations may lead to soil cracks and instability. The material cost is relatively high, and a large amount of cement is required during the construction process, causing adverse effects on the environment.

[0005] Chemical grouting method: Using chemical slurry (such as sodium silicate or epoxy resin) to fill soil pores and solidify the soil through chemical reactions to improve the anti-seepage performance.

[0006] Defects: The materials are expensive and may cause pollution to the environment. Especially after the slurry ages, it may affect the quality of soil and groundwater. The compressive strength of the solidified soil is relatively low and cannot meet the long-term bearing requirements. It has no dynamic regulation ability and cannot adapt to the humidity and pressure changes caused by groundwater level fluctuations.

[0007] In summary, the existing technologies have the following problems in terms of soil stability, adaptability, and environmental friendliness: Insufficient dynamic response ability: The existing technologies are all static treatment methods and are difficult to cope with the humidity and pressure fluctuations caused by frequent changes in the groundwater level.

[0008] Poor long-term stability: The long-term performance of traditional cement and chemical slurry will decay due to environmental impacts and it is difficult to maintain the structural stability of the soil.

[0009] High construction cost: The existing process materials are expensive and the construction is complex, especially when applied on a large scale, the economy is poor.

[0010] Lack of environmental friendliness: The large use of cement and the potential pollution risk of chemical slurry do not meet the current environmental protection requirements.

[0011] Therefore, there is an urgent need for a treatment method that can adapt to the dynamic changes of the groundwater level and improve soil stability, and is superior to the existing technologies in terms of performance, cost, and environmental friendliness. Summary of the Invention

[0012] To solve the problems raised in the above background technology, the present invention provides a soil stabilization treatment method for high groundwater level change areas. By combining dynamic regulation materials with microbial mineralization, it realizes the dynamic response ability of soil to absorb water and expand and slowly release water when releasing water, greatly improves the anti-permeability and compressive strength of the soil, and at the same time has simple construction, low cost, and excellent environmental protection performance. Compared with the existing technologies, it solves the problems of insufficient soil stability, poor adaptability, and high cost in the groundwater level fluctuation area, and is applicable to complex environments such as coastal beaches and soft soil areas, with significant technical and economic advantages.

[0013] To achieve the above object, the present invention provides the following technical solutions: A soil stabilization treatment method for high groundwater level change areas, comprising the following steps: Prepare a dynamic stabilization material containing the following components: Bentonite: 40 - 60 wt%; Attapulgite: 10 - 20 wt%; Zeolite: 10 - 20 wt%; Lignin: 5 - 10 wt%; Modified nano-carbonate: 5 - 10 wt%; Plant extract: 1 - 5 wt%; Microbial assistant: 0.5 - 2 wt%; Mix the above dynamic stabilization material with the soil in the target area, with a mixing depth of 10 - 20 cm, and compact it; According to the change of the groundwater level, evenly sprinkle water on the surface of the mixed soil, with a water volume of 100 - 150 L / m², to promote the further combination of the material and the soil; Spray a layer of modified plant extract solution on the surface soil to form a temporary protective film with a thickness of 0.5 - 1 mm to control water evaporation and runoff erosion.

[0014] Among them, bentonite, attapulgite, and zeolite are heat-treated at 300 - 500 °C for 2 hours before use to improve their activation performance, and the material dispersibility is enhanced through a crushing process with a particle size less than 75 µm.

[0015] Among them, the modified nano-carbonate is prepared from industrial waste slag or carbide slag, and the modification steps include mechanical grinding and adding 0.5 - 1 wt% of a catalyst to improve its dynamic deposition ability.

[0016] Among them, the microbial additive is actinomycetes or lactic acid bacteria, and its concentration is 10 7 CFU / mL, which is used to induce the carbonate mineralization reaction between soil particles, promote pore filling when the groundwater level rises, and enhance the particle binding strength when the water level drops.

[0017] Among them, the layered treatment of the dynamic stabilizing material includes: Surface soil: The dynamic stabilizing material is evenly mixed with the soil, and the depth is 10 - 20 cm; Deep soil: The dynamic stabilizing material is laid in layers, with each layer having a thickness of 20 - 30 cm. After each layer is laid, it is evenly compacted, and the uniform distribution of the material is promoted by natural seepage or artificial watering.

[0018] Among them, the plant extract for spraying the surface protective film is chitosan or modified starch, and its concentration is 1 - 3 wt%. The protective film can be degraded in the natural environment and provides short-term protection for the surface soil.

[0019] Among them, after the treatment of the dynamic stabilizing material is completed, water-tolerant plants are planted on the soil surface. The plants are rice grass or mangroves, and their roots and the soil material jointly form a long-term stable structure.

[0020] Among them, the dosage of the dynamic stabilizing material in the construction area is 3 - 5 kg / m².

[0021] Among them, this method is applicable to high groundwater level areas where the fluctuation range of the groundwater level exceeds 2 m and the soil moisture content is greater than 30%. The long-term stabilization effect is achieved through the adaptive performance of the dynamic material.

[0022] Among them, the active period of the dynamic stabilizing material is more than 2 years. Through the continuous metabolism and mineralization reaction of microorganisms, the long-term bearing capacity and anti-seepage ability of the soil can be further improved.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The dynamic regulation performance is significantly improved Both the traditional cement grouting method and the chemical grouting method are static stabilization methods, which cannot adapt to the humidity change and pore water pressure change caused by the fluctuation of the groundwater level. Lack of water absorption / water release regulation function, long-term use may lead to soil fissures and structural instability.

[0024] The dynamic stabilizing material of the present invention has the characteristics of water absorption and swelling and slow water release, and can automatically adjust the soil humidity and pore water pressure with the fluctuation of the groundwater level. The microbial additive forms "bio-cement" through metabolic action, further enhancing the dynamic regulation ability of the material and significantly improving the adaptability and stability of the soil.

[0025] 2. The anti-seepage performance is greatly improved Due to the large particle size of traditional cement grouting method, it is difficult to effectively fill the pores of fine-grained soil, and its anti-seepage performance is limited. Although the chemical grouting method can improve the anti-seepage property, it is prone to a decrease in permeability due to the aging of chemical grouts, resulting in poor long-term effects.

[0026] Bentonite and attapulgite in the materials of the present invention have high water absorption and pore filling properties, and expand under the action of moisture, significantly reducing the soil permeability. Nano-carbonate forms a crystal structure through dynamic deposition, further strengthening the pore sealing effect.

[0027] 3. Significantly enhanced compressive strength The compressive strength of the traditional cement grouting method is limited (about 1.0 MPa), and the strength after curing of the chemical grouting method is even lower (about 0.9 MPa). Under long-term water level fluctuations, the existing technologies are prone to gradually weaken the soil structure.

[0028] Bentonite and attapulgite in the hybrid materials of the present invention improve the bonding property of soil particles, and the microbial mineralization further enhances the cementation strength of the soil. The dynamic material layering construction and compaction treatment ensure the continuous stability of the soil structure.

[0029] 4. Simple construction and low cost A large amount of cement is required in the construction of the traditional cement grouting method, and the materials of the chemical grouting method are expensive and the equipment is complex, both of which have high cost problems. The existing technologies are less economical in large-area construction.

[0030] The dynamic stabilizing material of the present invention is composed of natural minerals (bentonite, attapulgite, zeolite) and industrial by-products (lignin, nano-carbonate), and the material cost is only 30%-50% of the existing processes. Construction is carried out at normal temperature and pressure without expensive equipment, and the process is simple and easy to promote.

[0031] 5. Excellent environmental protection performance Due to the large amount of cement used in the traditional cement grouting method, the carbon emission is high during the production process, causing relatively large environmental pollution. The grouts used in the chemical grouting method (such as sodium silicate, epoxy resin) may pollute the soil and groundwater.

[0032] The dynamic stabilizing material of the present invention uses natural minerals and renewable industrial by-products as raw materials, and does not contain polluting chemical components. The microbial additives are environment-friendly biological agents, which are friendly to the soil ecosystem. Beneficial effects

[0033] Improved dynamic regulation performance: The material can adapt to the dynamic fluctuations of the groundwater level, effectively solving the problem of insufficient adaptability of the existing technologies.

[0034] Better comprehensive performance: Significantly improve the anti-seepage property and compressive strength, while maintaining good dynamic water absorption and water release capabilities.

[0035] Construction economy and environmental protection: The materials are widely sourced, low-cost, easy to construct, and meet the requirements of sustainable development.

[0036] Wider application scenarios: Particularly suitable for areas with frequent groundwater level fluctuations, such as coastal tidal flats, riverbanks, lake peripheries, and agricultural irrigation areas.

[0037] The present invention has achieved a breakthrough effect of comprehensively surpassing the prior art in terms of performance, economy, and environmental protection. Brief Description of the Drawings

[0038] Figure 1 It is a process schematic diagram of the present invention. Detailed Embodiments

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] See Figure 1 , the present invention relates to a method for soil stabilization treatment in areas with high groundwater level changes, including the following steps: Prepare a dynamic stabilizing material containing the following components: Specific process flow 1. Material preparation ① Pretreatment of natural minerals: Crush bentonite, attapulgite, and zeolite to a particle size < 75 µm respectively, and perform heat treatment (300 - 500 °C, 2 hours) to activate their surface adsorption capacity.

[0041] Crushing and particle size control (<75 µm): Reduce the particle size, increase the specific surface area of the mineral, and make its adsorption capacity stronger when contacting the soil. Smaller particle sizes can fill soil pores, reduce permeability, and enhance structural stability.

[0042] Heat treatment (300 - 500 °C, 2 hours): Heat treatment activates the mineral surface, increasing the number of adsorption sites (such as the exposure of hydroxyl groups and siloxane bonds). Remove organic impurities or moisture in natural minerals, and improve adsorption performance and chemical reaction activity.

[0043] ② Mixing and modification: Mix nano-carbonate and lignin, and mechanically stir for 30 minutes at normal temperature and pressure to make them evenly distributed.

[0044] Mixing of nano-carbonate and lignin: The nano-particle size provides a high surface area and high activity, enabling deposition in soil micropores. When the water level rises, the carbonate reacts with ions in the pore water to form crystal deposits, enhancing the pore filling effect; when the water level drops, part of the sediment dissolves, releasing water to maintain soil moisture. The long-chain molecular structure of lignin can enhance the flexibility and adhesion of the material. As a natural biopolymer, lignin forms a network cross-linked structure between soil particles, improving crack resistance and toughness.

[0045] ③ Composite ingredients: According to the formula ratio, re-mix all the basic stabilizing materials and functional additives until the particles are uniform (particle size < 100 µm).

[0046] Addition of functional additives: Mix bentonite, attapulgite, zeolite with functional materials to enhance the multi-functionality of the soil: Bentonite swells upon absorbing water to regulate pore water pressure; Attapulgite provides particle support and enhances soil strength; Zeolite has anti-permeability and can adsorb harmful substances. The uniform distribution of functional additives ensures consistent material properties throughout the soil.

[0047] Re-mixing: Ensure that the particle size is moderate, capable of filling pores while maintaining fluidity during mixing. Avoid particle agglomeration to ensure optimal adsorption and deposition performance.

[0048] ④ Introduction of microorganisms: Add a microbial solution (concentration 10 7 CFU / mL) to the mixed material, stir evenly and then spray or broadcast directly for use.

[0049] Addition of microbial solution: Microbial metabolism and mineralization reactions, where actinomycetes or lactic acid bacteria metabolize to produce carbonate ions, which together with nano-carbonate promote the formation of calcium carbonate crystals, forming "bio-cement". Polysaccharides or proteins secreted by microorganisms act as binders to enhance the adhesion between particles. Pore structure optimization, microbial-induced calcium carbonate deposition in pores fills the extra space and reduces soil permeability. Dynamic regulation: When the groundwater level rises, microorganisms can continue to metabolize using the water in the environment to form more deposits; when the water level drops, part of the deposited carbonate crystals dissolves, releasing water.

[0050] Spraying or broadcasting: After the microbial solution evenly covers the soil particles, it can quickly survive and reproduce in the soil surface or deep environment. The distribution and continuous metabolic ability of microorganisms ensure that the material can still play a long-term role after construction.

[0051] 2. Construction process ① Surface stabilization: Evenly sprinkle the prepared mixed material on the target area (dosage: 3 - 5 kg / m²).

[0052] The material was mixed with the topsoil using a shallow tiller (depth: 10-20 cm) and compacted.

[0053] Evenly spread the mixed materials: Bentonite, attapulgite, zeolite, etc. in the mixed materials fill the gaps between soil particles, forming a preliminary physical reinforcement structure and reducing the permeability of the surface soil. Evenly spread the mixed materials to ensure that the properties of the mixed materials are evenly distributed throughout the surface area.

[0054] Shallow tillage: Tillage can fully mix the mixed materials with the surface soil, making the stabilized materials more tightly attached to the surface of soil particles. It can also improve the bonding strength between the mixed materials and soil particles, enhance the compression resistance of the surface soil, and avoid soil loosening or surface water erosion.

[0055] Compaction: After compaction, the porosity between soil particles is significantly reduced, reducing groundwater infiltration and evaporation losses. It improves the density and bearing capacity of the surface soil and forms a high-strength protective layer.

[0056] ② Deep regulation: In areas with large groundwater level fluctuations: Layered construction: Spread the mixed material 20-30 cm thick each time and compact it layer by layer.

[0057] Use natural seepage or artificial sprinkling (water consumption: 100-150 L / m²) to promote uniform distribution of the material and wait for natural curing for 2-3 days.

[0058] During each layer of construction, the mixed material fills the deep soil pores and reduces the porosity through compaction, strengthening the soil structure layer by layer. Layered construction makes the material more stable and avoids the problem of difficult uniform distribution of materials in one-time construction.

[0059] Natural water seepage or artificial watering: Natural water seepage, groundwater in the process of fluctuation, promotes the active components in the mixed materials (such as bentonite, nanocarbonate) to absorb water and swell or dynamically deposit. Artificial watering, during the construction stage, activates the water absorption capacity of the mixed materials by watering, prompting the bentonite to absorb water and swell, closing the pores, and promoting the deposition of calcium carbonate crystals. The infiltration of water can activate the metabolic activities of microorganisms and induce the deposition of calcium carbonate to form a microscopic "cemented" structure.

[0060] Natural solidification: The solidification process allows the components in the material to further combine with soil particles. The water film structure formed by bentonite can alleviate the rapid loss of water. The microbial metabolic process is gradually activated during the solidification period, generating calcium carbonate deposition and cross-linking structure, which strengthens the long-term stability of the soil.

[0061] ③Smart wrapping layer (optional): Spray a layer of modified starch or chitosan solution (concentration 1 - 3 wt%, thickness about 0.5 - 1 mm) on the soil surface to form a temporary protective film to avoid rapid evaporation of water.

[0062] Physical barrier: After spraying, a flexible protective film is formed, effectively preventing the evaporation of water on the soil surface and reducing soil shrinkage and cracking caused by drying.

[0063] Moisture regulation: Modified starch and chitosan have good moisture absorption and release capabilities, and can slowly regulate soil moisture during humidity changes.

[0064] Erosion resistance: The protective film can enhance the runoff resistance of the soil surface and avoid material loss caused by rainfall or irrigation.

[0065] Biodegradation: Chitosan or starch gradually decomposes into organic nutrients in the natural environment, providing additional fertility for the soil and maintaining the ecological function of the soil in the long term.

[0066] 3. Post - maintenance ① Supplementary materials: According to the change of the groundwater level or the soil strength requirement, sprinkle a small amount of materials (dosage 0.5 - 1 kg / m²) every 3 - 6 months.

[0067] Sprinkling a small amount of materials: Maintain the dynamic adsorption / water release capacity. The supplementary materials (bentonite, attapulgite, zeolite) can further fill the pores in the existing soil structure. At the same time, they can absorb water and expand or release water to relieve the stress of soil moisture change, continuously improving the dynamic regulation effect. When supplementing nano - carbonate particles, calcium carbonate crystals can be redeposited through environmental moisture induction to strengthen pore filling and inter - particle cementation.

[0068] Enhance microbial activity. The microbial aids in the new materials continue the metabolic process, continuously inducing mineralization reactions to form more "bio - cement" structures. The adhesives (such as polysaccharides and proteins) produced by the continuous metabolism of microorganisms can compensate for the weakening points that may occur in the existing structure due to environmental changes.

[0069] Maintaining dynamic response characteristics: When the water level is high, the bentonite and attapulgite in the supplementary materials absorb water and expand, further reducing the pore water pressure and stabilizing the structure between particles.

[0070] When the water level is low, the supplementary nano - carbonate partially dissolves and releases water in a dry environment, and at the same time further enhances the structural stability through crystal deposition.

[0071] Mechanism for reducing maintenance costs: Long-term cycle, the supplementary materials synergize with the original materials, reducing the dosage and frequency of each construction. The low cost and easy constructability of the supplementary materials reduce the economic input for subsequent maintenance.

[0072] ② Vegetation combination: Sow water-tolerant plants (such as rice grass or mangroves), and use the root systems to further stabilize soil particles.

[0073] Functions of water-tolerant plants (such as rice grass or mangroves): Root fixation, the root systems of plants grow among soil particles, playing a mechanical strengthening role, similar to natural fiber reinforcement materials. The organic substances excreted by the root systems combine with soil particles, further enhancing the adhesiveness and erosion resistance.

[0074] Water regulation, plants absorb groundwater through their root systems, relieving the water pressure in areas with high groundwater levels, and at the same time reducing the impact of excessive infiltration on soil stability.

[0075] Ecological improvement, water-tolerant plants increase the soil organic matter content through growth, enhance the ecological activity of the soil, and form a long-term self-sustaining stable system.

[0076] Formation of a long-term and stable ecological system: The root systems continue to develop, gradually forming a deep fixation network, further enhancing the dynamic response ability of the soil. The growth of water-tolerant plants can relieve the impact of extreme water level fluctuations (such as heavy rain or drought) on the soil.

[0077] This method has the following characteristics: 1. Low cost: Using natural minerals (bentonite, attapulgite, zeolite) and industrial by-products (lignin, nano-carbonate), the unit cost is only 30%-50% of the traditional cement grouting method.

[0078] Natural minerals and industrial by-products, using low-cost natural minerals (bentonite, attapulgite, zeolite) and industrial by-products (lignin, nano-carbonate), without the need to prepare additional high-cost materials.

[0079] Micro-supplementation, the dosage of each supplement is small (0.5 - 1 kg / m²), and the construction is simple, without the need for large equipment, further reducing the maintenance cost.

[0080] Vegetation assistance, the self-growth property of water-tolerant plants reduces the cost of later manual intervention, improves the soil ecological environment at the same time, and reduces the long-term investment.

[0081] 2. Dynamic regulation: The material can adsorb / desorb water with the change of the groundwater level, being long-term stable and reducing the maintenance cost.

[0082] Dynamic response ability maintenance: Supplementary bentonite and attapulgite materials can automatically adsorb or release water with the change of the groundwater level, adjust the pore water pressure, and avoid the structural instability of the soil caused by rapid water changes. Supplementary nano-carbonate particles can form dynamic crystal deposition or dissolution under different water level conditions to achieve continuous optimization of the pore structure.

[0083] Self-healing ability: The microbial mineralization reaction is initiated with the change of the environment. When structural weakening or cracks occur, microbial metabolites (such as calcium carbonate crystals) can spontaneously fill these defects.

[0084] 3. Simple construction: Normal temperature and pressure process, no need for expensive equipment and complex construction, suitable for large-scale promotion.

[0085] Low technical requirements: Supplementary materials do not require additional processing and can be directly sown, applicable to any area.

[0086] Strong adaptability: The material can take effect quickly after being combined with the soil, without special construction conditions such as high temperature and pressure.

[0087] Combination with vegetation and naturalization: The planting and maintenance of water-tolerant plants are simple, and their root systems can gradually play a role during the natural growth process, avoiding the dependence on high-tech equipment and complex processes.

[0088] 4. Strong environmental protection: Using natural and renewable resources, no chemical pollution, meeting the sustainable development goals.

[0089] No chemical pollution: The materials are all composed of natural minerals (bentonite, attapulgite, zeolite) and renewable resources (lignin, chitosan), and will not cause chemical pollution to groundwater and soil.

[0090] Utilizing industrial by-products: Nano-carbonate is derived from carbide slag or slag, which is the reuse of waste resources and meets the sustainable development goals.

[0091] Vegetation improves the ecological environment: The growth of water-tolerant plants not only stabilizes the soil but also improves soil fertility, forming a self-sustaining green ecological system.

[0092] The method of the present invention was tested and compared with the existing process, and the data statistics are as follows: Among them, the existing process A: Traditional cement grouting method Principle: Inject cement slurry into the soil through grouting equipment, fill the soil pores, and enhance the compressive strength and compactness of the soil through the cement hardening process.

[0093] Advantages: The process is mature, and the equipment and construction technology are widely used.

[0094] It has a certain effect on improving the compressive strength of the soil.

[0095] Disadvantages: Lack of dynamic regulation: Unable to adapt to changes in groundwater level and insufficient water absorption / release capacity.

[0096] Limited impermeability performance: Due to the relatively coarse particles in the cement slurry, the improvement effect of permeability is not significant.

[0097] High cost and environmental impact: Using a large amount of cement, the material cost is relatively high, and it has a certain impact on the ecological environment.

[0098] Existing process B: Chemical grouting method Principle: Inject chemical slurry (such as sodium silicate, polymer or epoxy resin) into the soil. After chemical reaction, the soil particles are solidified to improve impermeability and stability.

[0099] Advantages: Significantly improves the permeability of fine-grained soil.

[0100] The compactness of the soil after curing is relatively high, and the water resistance performance is better than that of the cement grouting method.

[0101] Disadvantages: Lack of dynamic response: Unable to adjust the humidity change caused by water level fluctuation.

[0102] Insufficient strength: The compressive strength after curing is lower than that of the cement grouting method.

[0103] High cost: The chemical slurry materials are expensive, and the construction cost is high.

[0104] Environmental protection issues: Some chemical slurries may cause pollution to the environment and are not suitable for large-scale promotion.

[0105] After analysis of the test records: Impermeability (permeability coefficient): The present invention (Tests 1-6) is significantly superior to the existing processes in terms of impermeability performance.

[0106] The optimal test (Test 3) has a permeability coefficient of 1.0×10⁻ 7 cm / s, which is 77.8% lower than that of the traditional cement grouting process A (4.5×10⁻ 7 cm / s) and 73.7% lower than that of the chemical grouting process B (3.8×10⁻ 7 cm / s).

[0107] Compressive strength: The compressive strength of the present invention (1.4 - 2.0 MPa) is significantly higher than that of the existing processes A (1.0 MPa) and B (0.9 MPa).

[0108] The compressive strength of the optimal test (Test 3) is 2.0 MPa, which is twice that of the existing Process A and 2.2 times that of Process B.

[0109] Dynamic water absorption rate and water release rate: The present invention (with a water absorption rate of 25%-32% and a water release rate of 22%-27%) is significantly superior to the existing Process A (with a water absorption rate of 10% and a water release rate of 8%) and Process B (with a water absorption rate of 12% and a water release rate of 10%).

[0110] The present invention exhibits good regulation ability under dynamic water level fluctuation conditions, while the existing processes lack dynamic response characteristics and cannot effectively respond to the change of groundwater level.

[0111] Conclusion Performance advantages: The impermeability and compressive strength of the present invention are significantly superior to the prior art, and can effectively meet the soil stabilization requirements in areas with high groundwater level changes. The improvement of the dynamic water absorption rate and water release rate makes the present invention significantly lead in dynamic response performance, filling the shortcoming of the existing processes.

[0112] Economy and environmental protection: The present invention uses natural minerals and industrial by-products, with significantly lower costs than the existing chemical grouting processes and strong environmental protection. Compared with the existing Process A (high consumption of cement) and Process B (chemical slurry), the present invention is more environmentally friendly and has simple construction.

[0113] Comprehensive evaluation: The comprehensive performance of the present invention is comprehensively superior to the existing processes in terms of impermeability, compressive strength and dynamic response ability, and is particularly suitable for the soil stabilization requirements in areas with frequent groundwater level fluctuations.

[0114] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for soil stabilization treatment in a high groundwater level change area, characterized in that, It includes the following steps: Prepare a dynamic stabilizing material containing the following components: Bentonite: 40 - 60 wt%; Palygorskite: 10 - 20 wt%; Zeolite: 10 - 20 wt%; Lignin: 5 - 10 wt%; Modified nano - carbonate: 5 - 10 wt%; Plant extract: 1 - 5 wt%; Microbial additive: 0.5 - 2 wt%; Mix the above - mentioned dynamic stabilizing material with the soil in the target area, with the mixing depth being 10 - 20 cm, and compact it; According to the change of the groundwater level, sprinkle water evenly on the surface of the mixed soil, with the water volume being 100 - 150 L / m², to promote the further combination of the material and the soil; Spray a layer of modified plant extract solution on the surface soil to form a temporary protective film with a thickness of 0.5 - 1 mm, controlling water evaporation and runoff scouring.

2. The soil stabilization treatment method for the area with high groundwater level change according to claim 1, wherein: Bentonite, palygorskite and zeolite are heat - treated at 300 - 500 °C for 2 hours before use to improve their activation performance, and the material dispersibility is enhanced through a crushing process with a particle size less than 75 µm.

3. The soil stabilization treatment method for the area with high groundwater level change according to claim 1, characterized in that: The modified nano - carbonate is prepared from industrial waste slag or carbide slag, and the modification steps include mechanical grinding and adding 0.5 - 1 wt% of a catalyst to improve its dynamic deposition ability.

4. The soil stabilization treatment method for the area with high groundwater level change according to claim 1, characterized in that: The microbial adjuvant is actinomycetes or lactic acid bacteria, and its concentration is 10 7 CFU / mL, which is used to induce the carbonate mineralization reaction between soil particles, promote pore filling when the groundwater level rises, and enhance the particle binding strength when the water level drops.

5. The soil stabilization treatment method for the area with high groundwater level change according to claim 1, characterized in that: The layered treatment of the dynamic stabilizing material includes: Surface soil: The dynamic stabilizing material is evenly mixed with the soil, with a depth of 10 - 20 cm; Deep soil: The dynamic stabilizing material is laid in layers, with each layer having a thickness of 20 - 30 cm. After each layer is laid, it is evenly compacted, and the uniform distribution of the material is promoted through natural seepage or artificial sprinkling.

6. The soil stabilization treatment method for the area with high groundwater level change according to claim 1, characterized in that: The plant extract for spraying the surface protective film is chitosan or modified starch, with a concentration of 1 - 3 wt%. The protective film can be degraded in the natural environment and provides short - term protection for the surface soil.

7. The soil stabilization treatment method for the high groundwater level change area according to claim 1, wherein: After the treatment of the dynamic stabilizing material is completed, water - tolerant plants are planted on the soil surface. The plants are rice straw or mangrove, and their roots and the soil material jointly form a long - term stable structure.

8. The soil stabilization treatment method for the high groundwater level change area according to claim 1, characterized in that: The dosage of the dynamic stabilizing material in the construction area is 3 - 5 kg / m².

9. The soil stabilization treatment method for the area with high groundwater level change according to claim 1, characterized in that: The treatment method is applicable to high groundwater level areas where the fluctuation range of the groundwater level exceeds 2 m and the soil moisture content is greater than 30%. The long - term stabilization effect is achieved through the adaptive performance of the dynamic material.

10. The method for stabilizing soil in a high groundwater level change area according to claim 1, characterized in that: The active period of the dynamic stabilizing material is more than 2 years. Through the continuous metabolism and mineralization reaction of microorganisms, the long - term bearing capacity and anti - permeability of the soil can be further improved.

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