A method for soil fixation by cooperation of microorganisms in goaf and plants and a soil fixation device

Abstract

The application discloses a kind of goaf microorganism and plant synergic soil fixation method and soil fixation device, belong to goaf soil fixation technical field, its purpose is to solve the problem that existing goaf fixed process is difficult to realize deep layer stability and ecological restoration collaborative management, it includes the following steps: step S1, to goaf surface pretreatment;Step S2, obtain goaf data;Step S3, according to the model data in S2, determine as core reinforcement area and ecological restoration area;Step S4, core reinforcement area is carried out deep injection reinforcement;Step S5, plant planting, step S6, to ecological restoration area is carried out drip irrigation, real-time monitoring substrate intensity growth rate S and plant root system development index RDI;Step S7, according to the collection data of S and RDI, determine that repair is qualified;The application microorganism mineralization effectively cements deep layer loose matrix, improves soil strength and stability, also utilizes plant root system to enhance surface soil integrity and water and soil conservation capacity, forms synergic enhancement effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gob soil solidification, in particular to a method for gob soil solidification by microorganisms and plants in cooperation and a soil solidification device. BACKGROUND

[0002] A gob is a cavity and loose area formed after the exploitation of underground mineral resources, and its geological structure is severely damaged, which can easily cause geological disasters such as surface subsidence and settlement, and poses a threat to the mining area and the surrounding environment. The soil structure of the gob is loose, the bearing capacity is low, and the voids are developed, so it is difficult for the traditional single reinforcement method to realize the cooperative management of deep layer stability and ecological restoration. Especially in the aspects of deep matrix reinforcement, soil and water conservation, and ecological system reconstruction, the existing technology has obvious limitations, and it is urgent to develop a cooperative management technology that can realize mechanical reinforcement and ecological restoration at the same time.

[0003] The traditional gob management methods mainly include grouting reinforcement, gravel filling, concrete pile support and other engineering means, which can improve the stability of the foundation to a certain extent, but have problems such as high cost, large disturbance, poor ecological compatibility, etc. Although grouting reinforcement can improve the strength of the soil layer, the material used is mainly cement-based chemical slurry, which can easily cause soil compaction and groundwater pollution; gravel filling and pile foundation support have complex construction and poor adaptability, and cannot restore the ecological function of the soil. In addition, these methods mainly focus on short-term mechanical reinforcement and lack consideration of long-term ecological restoration of the gob, making it difficult to achieve sustainable management.

[0004] Microbial induced carbonate precipitation (MICP) technology is a new bio-mineralization reinforcement method, which uses urease produced by microorganisms such as Bacillus pasteurii to catalyze the hydrolysis of urea water to generate calcium carbonate precipitation, effectively cementing loose soil particles and improving the strength and stability of the soil body. MICP technology has the advantages of mild reaction conditions, environmental friendliness, and uniform reinforcement, and is especially suitable for deep soil repair. However, single MICP technology still has problems such as insufficient long-term stability, limited carbon source supply, and weak surface water and soil conservation capacity.

[0005] Plant remediation technology can effectively improve the erosion resistance of surface soil through root mechanical reinforcement and transpiration to reduce soil moisture, but its root depth is limited, and the reinforcement effect on deep gob is insufficient. If microbial reinforcement and plant remediation are combined, not only can the microbial mineralization be used to cement the deep matrix, but also the plant roots can enhance the integrity and ecological function of the surface soil, forming a synergistic reinforcement effect. However, there is no mature technical solution to realize the precise cooperation of microorganisms and plants in the management of gob.

[0006] To address the aforementioned issues, this invention proposes a microbial and plant-based synergistic soil stabilization device and construction process for goaf areas. By integrating a deep injection system, an intelligent drip irrigation system, and an ecological monitoring module, it achieves precise injection of MIP and synergistic regulation of plant root development, overcoming the limitations of single technologies and providing a green, efficient, and sustainable solution for goaf remediation. Summary of the Invention

[0007] To address the aforementioned problems in the prior art, this invention provides a method and device for synergistic soil stabilization using microorganisms and plants in goaf areas, which solves the problem that existing goaf stabilization processes are unable to achieve synergistic management of deep stabilization and ecological restoration.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] On the one hand, a method for soil stabilization through the synergistic interaction of microorganisms and plants in empty areas is provided, which includes the following steps:

[0010] Step S1: Surface pretreatment of the goaf area to be operated;

[0011] Step S2: Obtain a three-dimensional geological model and surface morphology data of the mined-out area using ground-penetrating radar to identify potential collapse risk areas and void development areas;

[0012] Step S3: Based on the model data in Step S2, the collapse risk area is identified as the core reinforcement area, and the void development area is identified as the ecological restoration area.

[0013] Step S4: Deep injection reinforcement is carried out on the core reinforcement area by injecting microbial slurry and curing agent into the core reinforcement area to induce microbial-induced calcium carbonate precipitation reaction.

[0014] Step S5: After the deep injection is completed, plant plants in the ecological restoration area. Plant deep-rooted shrubs and herbaceous plants in the ecological restoration area at a density of 4-6 plants / m².

[0015] Step S6: After planting, drip irrigation is carried out on the ecological restoration area through the above-ground drip irrigation system, and the substrate strength growth rate S and the plant root development index RDI are monitored in real time through the ecological monitoring and adaptive control module.

[0016] Step S7: Based on the collected data of matrix strength growth rate S and plant root development index RDI, when S≥20% and RDI≥0.7, the soil stabilization and remediation of the mining area is qualified.

[0017] In this scheme, the integrated management of deep reinforcement and surface ecological restoration of mining subsidence areas is achieved through the microbial-plant synergistic soil stabilization technology. It effectively cements the deep loose matrix through microbial mineralization, improving soil strength and stability, and enhances the integrity of the surface soil and soil and water conservation capacity by utilizing plant roots, thus forming a synergistic enhancement effect.

[0018] Furthermore, the method for deep injection reinforcement of the core reinforcement area in step S4 is as follows: first, inject a mixture of bacterial solution and nutrient solution in a volume ratio of 1:1, and after an interval of 12 hours, inject the curing agent solution.

[0019] Furthermore, in step S7, when the substrate strength growth rate S < 15% or the plant root development index RDI < 0.5, step S4 or step S5 is repeated until the target is met.

[0020] On the other hand, a soil stabilization device based on a synergistic soil stabilization method using microorganisms and plants in mined-out areas is provided, comprising:

[0021] Tracked mobile platform;

[0022] Deep injection system; the deep injection system is installed at the front or rear end of the tracked mobile platform, and the ground drip irrigation system;

[0023] The ground drip irrigation system includes a soil moisture sensor installed at the bottom of the front or rear end of the tracked mobile platform, and a telescopic drip irrigation arm installed on the tracked mobile platform.

[0024] Microbial storage system; the microbial storage system has multiple storage tanks mounted on a tracked mobile platform, and all of the storage tanks are connected to a mixing tank, which is connected to a deep injection system;

[0025] And an ecological monitoring and adaptive regulation module.

[0026] Furthermore, the deep injection system includes a hydraulically driven drill rod located at the front or rear end of the tracked mobile platform; the drill rod is hollow inside, and the top of the hollow part is connected to the outlet of the mixing tank through a pipe, and the bottom of the drill rod is provided with an injection port that communicates with the hollow part.

[0027] Furthermore, the multiple storage tanks include a bacterial solution storage tank for storing Pasteurella multocida bacterial solution, a nutrient solution storage tank for storing humic solution, and a solidifying agent storage tank for storing a mixed solution of urea and calcium chloride; the bacterial solution storage tank, the nutrient solution storage tank, and the solidifying agent storage tank are all connected to the mixing tank.

[0028] Furthermore, the ecological monitoring and adaptive control module includes a ground-penetrating radar, a multispectral camera, a root sensor, and a central processing unit, all mounted on a tracked mobile platform. The ground-penetrating radar, multispectral camera, and root sensor are all electrically connected to the central processing unit.

[0029] Furthermore, the root sensor is mounted on the telescopic drip irrigation arm.

[0030] This invention discloses a method and device for synergistic soil stabilization using microorganisms and plants in mined-out areas, the beneficial effects of which are:

[0031] 1. This invention achieves integrated management of deep reinforcement and surface ecological restoration of mining subsidence areas through microbial-plant synergistic soil stabilization technology. It effectively cements deep loose matrix through microbial mineralization, improving soil strength and stability, and enhances the integrity of surface soil and water conservation capacity by utilizing plant roots, forming a synergistic enhancement effect.

[0032] 2. This invention employs an intelligent monitoring and adaptive control system, achieving precision and intelligence in the remediation process. By integrating ground-penetrating radar, multispectral cameras, and root sensors, it collects real-time data on matrix structure characteristics and vegetation growth. Based on a three-dimensional geological model, it dynamically optimizes injection parameters and irrigation strategies, not only improving construction accuracy but also significantly reducing the need for manual intervention and operating costs, providing technical support for large-scale remediation of mining subsidence areas.

[0033] 3. The microbial-plant synergistic soil stabilization process of this invention has significant environmental friendliness and sustainability. MICP technology utilizes natural microorganisms and their metabolites to reinforce soil, avoiding the pollution of soil and groundwater caused by traditional chemical grouting materials. Deep-rooted plant planting not only enhances the erosion resistance of the topsoil but also fixes atmospheric carbon dioxide through photosynthesis, forming an ecological carbon sink. The bacterial solution and nutrient solution used in the device are both biodegradable, causing no secondary pollution and meeting the requirements of green mine construction and ecological environment restoration. This synergistic governance model provides a long-term and stable ecological restoration solution for mined-out areas, with significant environmental and social benefits.

[0034] 4. This invention is applicable to the treatment of goaf areas under various complex geological conditions, possessing strong adaptability and promotional value. The tracked mobile platform enables the device to operate stably in rugged mining terrain, the deep injection system can adjust injection parameters for areas with different porosity, and the intelligent drip irrigation system provides precise irrigation based on soil moisture and plant needs. This highly integrated technical solution not only effectively addresses the risk of goaf collapse but also restores the ecological environment of mining areas, making it significant for promoting the development of mine geological disaster management and ecological restoration technologies. Attached Figure Description

[0035] Fig. 1This is a schematic diagram of the structure of a soil stabilization device for mining subsidence areas using microorganisms and plants in synergy.

[0036] Fig. 2 This is a schematic diagram of the connection of the microbial storage system of the present invention.

[0037] Fig. 3 This is a schematic diagram illustrating the use of the hydraulically driven drill rod of the present invention.

[0038] Among them, 100 is a tracked mobile platform; 200 is a hydraulically driven drill rod; 300 is a ground drip irrigation system; 301 is a drip irrigation arm; 302 is a soil moisture sensor; 400 is a microbial liquid storage system; 401 is a bacterial liquid storage tank; 402 is a nutrient solution storage tank; 403 is a solidifying agent storage tank; 404 is a mixing tank; 500 is an ecological monitoring and adaptive control module; 501 is a ground penetrating radar; 502 is a multispectral camera; 503 is a root sensor; and 504 is a central processing unit. Detailed Implementation

[0039] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0040] Example 1

[0041] refer to Figs. 1-3 This embodiment provides a soil stabilization device for goaf areas using microorganisms and plants. Its purpose is to address the problem that existing goaf stabilization processes cannot achieve deep stabilization and ecological restoration in a coordinated manner. The specific structure of this embodiment will be described in detail below.

[0042] A construction method for a soil stabilization device based on microorganisms and plants in a goaf includes the following steps:

[0043] Step S1: Surface pretreatment of the goaf area to be operated;

[0044] In this embodiment, shallow rotary tillage (20-30cm deep) is used to loosen the surface soil, and biochar amendment is applied to improve the water retention capacity and microbial activity of the substrate.

[0045] Step S2: Obtain a three-dimensional geological model and surface morphology data of the goaf area using ground penetrating radar 501, and identify potential collapse risk areas and void development areas.

[0046] Step S3: Based on the model data in Step S2, the collapse risk area is identified as the core reinforcement area, and the void development area is identified as the ecological restoration area.

[0047] In this embodiment, a 3D geological model of the mined-out area is generated by scanning the 3D geological model and surface morphology data of the mined-out area using a ground-penetrating radar 501. Then, areas with a porosity greater than 30% are marked as core reinforcement areas, and areas with a porosity of 15-30% are designated as ecological restoration areas. This allows for optimization of the injection path based on regional characteristics, ensuring a coverage rate of over 90%.

[0048] Step S4: Deep injection reinforcement is carried out on the core reinforcement area by injecting microbial slurry and curing agent into the core reinforcement area to induce microbial-induced calcium carbonate precipitation reaction.

[0049] The method for deep injection reinforcement of the core reinforcement area in step S4 is as follows: first, inject a mixture of bacterial solution and nutrient solution in a volume ratio of 1:1, and after an interval of 12 hours, inject the curing agent solution.

[0050] Step S5: After the deep injection is completed, plant plants in the ecological restoration area. Plant deep-rooted shrubs and herbaceous plants in the ecological restoration area at a density of 4-6 plants / m².

[0051] In this embodiment, a 1:1 mixture of bacterial solution and nutrient solution is injected into the core reinforcement area at an injection pressure of 1.2 MPa and an injection volume of 80 L / m². 3 After 12 hours, inject the curing agent solution at a rate of 50 L / m. 3 Amorpha fruticosa and ryegrass were planted in the ecological restoration area at a density of 4 plants per m².

[0052] Step S6: After planting, drip irrigation is carried out on the ecological restoration area through the above-ground drip irrigation system 300, and the substrate strength growth rate S and the plant root development index RDI are monitored in real time through the ecological monitoring and adaptive control module 500.

[0053] In this embodiment, the ecological restoration area is irrigated by the ground drip irrigation system 300. The drip irrigation amount is dynamically adjusted according to the data of the soil moisture sensor 302 to maintain the soil moisture content at 15-20%.

[0054] Step S7: Based on the collected data of matrix strength growth rate S and plant root development index RDI, when S≥20% and RDI≥0.7, the soil stabilization and remediation of the mining area is qualified.

[0055] In step S7, if the substrate strength growth rate S < 15% or the plant root development index RDI < 0.5, repeat step S4 or step S5 until the target is met.

[0056] In this embodiment, the ecological monitoring module monitors the substrate strength growth rate S and the root development index RDI in real time. When S ≥ 20% and RDI ≥ 0.7, the restoration is deemed satisfactory. When S < 20% or RDI < 0.7, the deep injection in step S4 or the plant planting in step S5 is repeated.

[0057] If S < 15% or RDI < 0.5 in a localized area, a secondary operation cycle is triggered until the target is met. After remediation, a microbial-plant synergistic carbon sequestration system is formed, with an average annual carbon sequestration of up to 2.5 kg / m², and the substrate bearing capacity can be increased to over 300 kPa.

[0058] After the repair is completed, a microbial-plant synergistic carbon fixation system is formed. Plants fix atmospheric CO2 through photosynthesis and provide carbon sources for microorganisms through root exudates. The calcium carbonate precipitate produced by microorganisms further stabilizes the substrate, forming a positive feedback loop.

[0059] Example 2

[0060] In a surface subsidence remediation project in a coal mine goaf, the method and device for synergistic soil stabilization using microorganisms and plants, as described in this invention, were applied. The remediation area covered approximately 1250 m², with an average subsidence depth of 2.8 m and a maximum subsidence depth of 4.5 m. The matrix porosity ranged from 0.35 to 0.62, classifying it as a Class III unstable goaf. The strata were primarily composed of silty clay with a water content of 18.2%, a pH of 7.8, and an ambient temperature of 28°C. The specific implementation process is as follows:

[0061] S1: The surface was tilled and leveled to a depth of 25cm using a rotary tiller, followed by the even application of a 2mm biochar amendment and 24-hour curing. Soil moisture sensor monitoring showed that the substrate water holding capacity increased from 18.2% to 21%.

[0062] S2: The tracked mobile platform travels along a preset path, and the ground-penetrating radar performs a grid scan at 0.5m intervals to generate a three-dimensional geological model. The modeling system identifies two high-risk subsidence areas with a porosity greater than 40%, and divides the mined-out area into a core reinforcement area with a porosity greater than 40% and an ecological restoration area with a porosity less than 25%.

[0063] S3: The deep injection system operates along the optimized path, with the drill pipe descending to a depth of 6 meters at a rate of 0.8 meters per minute. A 1:1 mixture of bacterial solution and nutrient solution is injected, with a *Bacillus pasteurellii* concentration of 10^8 CFU / mL and a humic substance concentration of 105 g / L. The injection pressure in the core area is 1.5 MPa, and the injection volume is 40 L / m³. The injection pressure in the ecological restoration area is 0.8 MPa, and the injection volume is 60 L / m³.

[0064] S4: After 12 hours, inject the curing agent, using a 1 mol / L urea and calcium chloride solution. The average injection volume in the core area is 85 L / m³, and the average injection volume in the ecological restoration area is 45 L / m³. During the injection process, monitor the pH value in real time and maintain it within the range of 8.2-8.5.

[0065] S5: After the injection operation is completed, Amorpha fruticosa is planted in the ecological restoration area with a plant spacing of 0.3m and a row spacing of 0.8m. Precision irrigation is carried out through drip irrigation arm 301, and the drip irrigation volume is dynamically adjusted according to the soil moisture sensor data to maintain the soil moisture content in the range of 20-25%.

[0066] S6: Multispectral camera 502 monitoring showed that after 30 days, vegetation coverage reached 65%, and the NDVI index increased from the initial 0.31 to 0.68. Ground penetrating radar 501 detection showed that the average porosity of the core area decreased from 0.42 to 0.19, and the matrix strength growth rate S reached 28.7%. Root sensor 503 monitoring showed that the root development index RDI reached 0.82.

[0067] S7: For the remaining 7% of the area where the local S value is less than 15%, supplementary injection was performed using a three-stage injection process: bacterial solution-nutrient solution-curing agent. The injection volume was controlled at 0.3 times the initial value. Monitoring after supplementary injection showed that the S value of all areas was ≥20.3% and the RDI was ≥0.75, meeting the repair standard.

[0068] S8: Monitoring 90 days after the completion of the remediation showed that the substrate bearing capacity increased to 310 kPa, and the average annual carbon sequestration reached 2.8 kg / m², forming a stable microbial-plant synergistic carbon sequestration system. After the rainy season, no significant subsidence or soil erosion was observed in the treated area.

[0069] Example 3

[0070] refer to Figs. 1-3 This embodiment provides a soil stabilization device for the co-existence of microorganisms and plants in mined-out areas. The specific structure of this embodiment will be described in detail below.

[0071] A soil stabilization device for mined-out areas using microorganisms and plants, comprising a tracked mobile platform 100, a deep injection system, a ground drip irrigation system 300, a microbial liquid storage system 400, and an ecological monitoring and adaptive control module 500.

[0072] The deep injection system is located at the front or rear end of the tracked mobile platform 100.

[0073] The ground drip irrigation system 300 includes a soil moisture sensor 302 installed at the bottom of the front or rear end of the tracked mobile platform 100, and a telescopic drip irrigation arm 301 installed on the tracked mobile platform 100.

[0074] The microbial storage system consists of more than 400 storage tanks mounted on a tracked mobile platform 100. Multiple storage tanks are connected to a mixing tank 404, which is connected to a deep injection system.

[0075] In this embodiment, the tracked mobile platform 100 adopts an existing hydraulically driven tracked chassis, specifically the Sany Heavy Industry SYL956H tracked chassis. It is hydraulically driven with a maximum climbing angle of 35°. The tracked mobile platform 100 provides a platform for other components. The microbial liquid storage system 400 provides the microbial injection solution required by the deep injection system. The ground drip irrigation system 300 provides water irrigation for vegetation. The ecological monitoring and adaptive control module 500 is used to collect a three-dimensional geological model of the goaf area and collect the growth rate of the solidified matrix strength S and the plant root development index RDI to determine whether the restoration is qualified. Thus, through the microbial-plant synergistic soil stabilization technology, the integrated management of deep reinforcement and surface ecological restoration of the goaf area is realized. It effectively cements the deep loose matrix through microbial mineralization, improving soil strength and stability, and enhances the integrity of the surface soil and water conservation capacity by utilizing plant roots, forming a synergistic enhancement effect.

[0076] Specifically, the deep injection system includes a hydraulically driven drill rod 200 located at the head or tail end of the tracked mobile platform 100; the drill rod 200 is hollow inside, and the top of the hollow part is connected to the outlet of the mixing tank 404 through a pipe, and the bottom of the drill rod 200 is provided with an injection port that communicates with the hollow part inside.

[0077] In this embodiment, the hydraulically driven drill rod 200 adopts an existing multi-functional hydraulic telescopic drill rod, specifically the XCMG XR280D hydraulic drill rod. The drill rod 200 has a hollow interior. An inlet is provided at the top of the drill rod, which communicates with the hollow interior of the drill rod, and is used to connect to the mixing tank 404 via an electric pump. An outlet is provided at the bottom of the drill rod, which communicates with the hollow interior of the drill rod, and is used to inject the injection fluid into the deep layers of the goaf.

[0078] Specifically, the multiple storage tanks include a bacterial solution storage tank 401 for storing Pasteurella multocida bacterial solution, a nutrient solution storage tank 402 for storing humic solution, and a solidifying agent storage tank 403 for storing a mixed solution of urea and calcium chloride; the bacterial solution storage tank 401, the nutrient solution storage tank 402, and the solidifying agent storage tank 403 are all connected to the mixing tank 404.

[0079] In this embodiment, the bacterial culture storage tank 401, nutrient solution storage tank 402, and curing agent storage tank 403 are all connected to the mixing tank 404 via an electric pump. The bacterial culture storage tank 401 is a stainless steel tank with a volume of 500L, storing *Bacillus pasteurellii* bacterial culture. The nutrient solution storage tank 402 is a PMMA tank containing a humic solution. The curing agent storage tank 403 is a stainless steel tank storing a mixed solution of urea and calcium chloride. The mixing ratio is precisely controlled through the mixing tank 404.

[0080] The calcium carbonate precipitation reaction includes the following steps:

[0081] Urea decomposes into carbonate and ammonium ions under the catalysis of urease from Bacillus pasteurellii:

[0082] CO(NH2)2 + 2H2O = 2NH4 + + CO3 2-

[0083] CO3 produced 2- With Ca in solution 2+ Calcium carbonate crystals are formed:

[0084] Ca 2+ + CO3 2- = CaCO3.

[0085] The microbial storage system 400 contains *Bacillus pasteurellii* bacterial solution stored in tank 401 and humic solution stored in tank 402, providing the core microorganisms and plant nutrition basis for the calcium carbonate precipitation reaction. Meanwhile, the urea and calcium chloride mixed solution stored in tank 403 is the key raw material for the reaction. The reaction process, catalyzed by *Bacillus pasteurellii* urease, decomposes urea to generate carbonate ions, which then combine with calcium ions to form calcium carbonate crystals. This not only achieves efficient material conversion but also strengthens the soil structure through the generated calcium carbonate crystals. This design effectively leverages the soil-stabilizing effect of microorganisms, ensuring the stability of the soil in the mined-out area.

[0086] Specifically, the ecological monitoring and adaptive control module 500 includes a ground-penetrating radar 501, a multispectral camera 502, a root sensor 503, and a central processing unit 504, all of which are respectively installed on the tracked mobile platform 100. The ground-penetrating radar 501, the multispectral camera 502, and the root sensor 503 are all electrically connected to the central processing unit 504.

[0087] In this embodiment, the central processing unit 504 adopts an existing industrial programmable logic controller, specifically a Siemens S7-1500 series PLC. The central processing unit 504 is connected to the electric pumps of each storage tank for adding microbial injection solution.

[0088] Ground penetrating radar 501 uses a MALA ProEx type ground penetrating radar with a detection depth of 10m and generates porosity distribution maps in real time. Multispectral camera 502 uses a FigSpec multispectral camera with a band range of 400-2500nm to monitor vegetation index NDVI and calcium carbonate deposition reflectance.

[0089] Specifically, the root sensor 503 is mounted on the telescopic drip irrigation arm 301.

[0090] In this embodiment, the drip irrigation arm 301 is connected to an external water tank via a liquid pump. Both the liquid pump and the soil moisture sensor 302 are electrically connected to the central processing unit 504. The drip irrigation arm 301 adopts a telescopic rod structure similar to a fishing rod, with a 304 stainless steel rod body at the telescopic joint, and a combined sealing structure of a fluororubber Y-type lip seal and a polytetrafluoroethylene dust scraper ring. When the drip irrigation arm 301 is extended, a pressure-compensating dripper is installed on the drip irrigation arm 301 for drip irrigation of the vegetation in the ecological restoration area. The soil moisture sensor 302 monitors the soil moisture, thereby achieving data linkage with the drip irrigation flow rate and realizing precise variable irrigation.

[0091] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A method for synergistic soil stabilization using microorganisms and plants in mined-out areas, characterized in that, Includes the following steps: Step S1: Surface pretreatment of the goaf area to be operated; Step S2: Obtain the three-dimensional geological model and surface morphology data of the goaf area through ground penetrating radar (501) to identify potential collapse risk areas and void development areas; Step S3: Based on the model data in Step S2, the collapse risk area is identified as the core reinforcement area, and the void development area is identified as the ecological restoration area. Step S4: Deep injection reinforcement is performed on the core reinforcement area. Microbial slurry and curing agent are injected into the core reinforcement area to induce a microbial-induced calcium carbonate precipitation reaction. The method for deep injection reinforcement of the core reinforcement area in step S4 is as follows: First, a mixture of bacterial solution and nutrient solution with a volume ratio of 1:1 is injected. After an interval of 12 hours, the curing agent solution is injected. Step S5: After the deep injection is completed, plant plants in the ecological restoration area. Plant deep-rooted shrubs and herbaceous plants in the ecological restoration area at a density of 4-6 plants / m². Step S6: After planting, the ecological restoration area is irrigated by the above-ground drip irrigation system (300), and the substrate strength growth rate S and the plant root development index RDI are monitored in real time by the ecological monitoring and adaptive regulation module (500). Step S7: Based on the collected data of matrix strength growth rate S and plant root development index RDI, when S≥20% and RDI≥0.7, the soil stabilization and remediation of the mining area is qualified. A soil stabilization device based on the above-mentioned method of synergistic soil stabilization using microorganisms and plants in goaf areas, comprising: Tracked mobile platform (100); Deep injection system; the deep injection system is located at the front or rear end of the tracked mobile platform (100); A ground-level drip irrigation system (300); the ground-level drip irrigation system (300) includes a soil moisture sensor (302) installed at the bottom of the front or rear end of a tracked mobile platform (100), and a telescopic drip irrigation arm (301) installed on the tracked mobile platform (100). Microbial storage system (400); the microbial storage system (400) has multiple storage tanks mounted on a tracked mobile platform (100), and the multiple storage tanks are connected to a mixing tank (404), which is connected to the deep injection system; And an ecological monitoring and adaptive regulation module (500).

2. The method for synergistic soil stabilization by microorganisms and plants in mined-out areas according to claim 1, characterized in that: In step S7, if the substrate strength growth rate S < 15% or the plant root development index RDI < 0.5, step S4 or step S5 is repeated until the target is met.

3. The soil stabilization device for the synergistic soil stabilization method of microorganisms and plants in goaf areas according to claim 1, characterized in that: The deep injection system includes a hydraulically driven drill rod (200) located at the head or tail end of a tracked mobile platform (100); the drill rod (200) is hollow inside, and the top of the hollow part is connected to the outlet of a mixing tank (404) through a pipe; the bottom of the drill rod (200) is provided with an injection port that communicates with the hollow part inside.

4. The soil stabilization device for the synergistic soil stabilization method of microorganisms and plants in goaf areas according to claim 1, characterized in that: The plurality of storage tanks include a bacterial solution storage tank (401) for storing Pasteurella multocida bacterial solution, a nutrient solution storage tank (402) for storing humic solution, and a solidifying agent storage tank (403) for storing a mixed solution of urea and calcium chloride; the bacterial solution storage tank (401), the nutrient solution storage tank (402), and the solidifying agent storage tank (403) are all connected to a mixing tank (404).

5. The soil stabilization device for the synergistic soil stabilization method of microorganisms and plants in goaf areas according to claim 1, characterized in that: The ecological monitoring and adaptive control module (500) includes a ground-penetrating radar (501), a multispectral camera (502), a root sensor (503), and a central processing unit (504) respectively installed on a tracked mobile platform (100); the ground-penetrating radar (501), the multispectral camera (502), and the root sensor (503) are all electrically connected to the central processing unit (504).

6. The soil stabilization device for the synergistic soil stabilization method of microorganisms and plants in goaf areas according to claim 5, characterized in that: The root sensor (503) is mounted on the telescopic drip irrigation arm (301).

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