Simulated root system based on magnetic expansion mortar and its simulation method

Abstract

The present invention provides a simulated root system based on magnetic expansion mortar and a simulation method thereof. The simulated root system comprises a root framework and a magnetic expansion mortar coating the root framework. The root framework comprises an iron core frame, around which a coil is wound. The free end of the coil is provided with a connector that is inserted into the current interface of a current controller. This simulated root system and simulation method can, to a certain extent, replace real plant roots in experimental research related to soil consolidation mechanisms, thereby overcoming the shortcomings of plant experiments such as long test cycles and poor controllability.

Description

Technical Field

[0001] The invention relates to the research field of slope ecological protection, and in particular to a simulated root system based on magnetic expansion mortar and a simulation method thereof. Background Art

[0002] In ecological slope protection projects, the roots of plants can effectively enhance the reinforcement of the soil and significantly improve the stability of the slope. Moreover, as the roots continue to grow and the root diameter increases, the anchoring effect of the roots will become more obvious. Therefore, it is very important to study the soil-fixing mechanism of plant roots.

[0003] However, conducting relevant research using real plants is extremely difficult, primarily due to the following issues: Root systems are easily disturbed by various factors during the cultivation process, resulting in plant death, withering, and abnormal growth, often leading to experimental interruptions; real plant indicators are difficult to control, making it difficult to set parameters exactly as required; plant growth is slow, resulting in low experimental efficiency; and it is impossible to cultivate two identical plants, resulting in poor experimental repeatability. To address the long testing cycles, difficult-to-control environmental factors, and difficulty controlling variables in root system experiments, the present invention provides a simulated root system based on magnetic expansion mortar and its simulation method. This method can, to a certain extent, replace real plant roots in experiments, providing new methods and new ideas for studying the mechanisms of root soil consolidation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a simulated root system based on magnetic expansion mortar and a simulation method thereof, which can replace the real plant root system to a certain extent to carry out relevant experimental research on soil consolidation mechanism, etc., and make up for the defects of long plant test cycle and poor controllability.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a simulated root system based on magnetic expansion mortar, including a root system skeleton and a magnetic expansion mortar coated on the outside of the root system skeleton, the root system skeleton includes an iron core skeleton, a coil is wound around the outside of the iron core skeleton, and a joint is provided at the free end of the coil, which is inserted into the current interface of the current controller.

[0006] In a preferred solution, the magnetic expansion mortar includes cement mortar, magnetic material particles and an expansion agent, the content of the magnetic material particles is 20% to 30%, and the content of the expansion agent is no more than 30%.

[0007] In a preferred solution, a drawing head is provided at the upper end of the core skeleton.

[0008] In a preferred embodiment, the free ends of the coils are collected by a wire receiving tube.

[0009] In a preferred solution, the current controller includes a circuit board, the circuit board is covered by an insulating shell, and the insulating shell is provided with a current interface corresponding to the interface of the circuit board.

[0010] In a preferred solution, a pressure sensor is provided on the surface of the magnetic expansion mortar, and the pressure sensor and the current controller are connected to the data processor via a data line.

[0011] In the preferred embodiment, the diameter of a single root system of the iron core skeleton is consistent from top to bottom, the winding spacing of the coil increases from top to bottom, and the current of the coil is consistent; or, the diameter of a single root system of the iron core skeleton gradually decreases from top to bottom, and the current of the coil is consistent; or, the diameter of a single root system of the iron core skeleton gradually decreases in a step-like manner from top to bottom, and the current of the coil of the single root system decreases in sections from top to bottom.

[0012] The present invention also provides a method for simulating a root system based on magnetic expansion mortar, comprising the following steps:

[0013] S1. Design a root system model based on experimental needs: determine the spatial distribution morphology of the root system, the number and spatial distribution characteristics of the main roots, and the diameter and length of the main roots. The spatial distribution morphology of the root system includes taproot and fibrous root types. The number and spatial distribution characteristics of the main roots include the horizontal angle between the main roots, the angle between each taproot and the vertical direction, and the distance between each taproot.

[0014] S2. Process the root system skeleton according to the spatial structure data of the root system skeleton designed in S1: first, process the iron core skeleton, then wind coils around the outside of the iron core skeleton. The number of coils is multiple, and they are wound in sections around the outside of the iron core skeleton. The two connectors of each coil are inserted into the current interface of the current controller.

[0015] S3, preparing magnetic expansion mortar: first, magnetic material particles, expansion agent and fine aggregate for preparing cement mortar are placed in a mixer and stirred to uniformly mix; then cement and water are placed in the mixer and stirred to fully mix to obtain magnetic expansion mortar;

[0016] S4. Place the prepared magnetic expansion mortar in a container for standby use, electrify the root skeleton and place it in the container for magnetic expansion mortar adsorption, and control the current of the coil by a current controller to control the adsorption thickness of the magnetic expansion mortar;

[0017] S5. Select the soil required for the study, dig a corresponding planting hole in the soil, bury the entire simulated root system prepared in S4 in the planting hole, and compact the soil according to the experimental requirements. After the magnetic expansion mortar expands and takes shape, disconnect the power supply of the current controller.

[0018] S6. Analyze the simulated root system data.

[0019] In the preferred solution, in S4, a pressure sensor is set on the surface of the magnetic expansion mortar, and the pressure sensor is connected to the data processor through a data line to measure the stress data before, during and after the expansion of the simulated root system, and store it in the data processor.

[0020] In a preferred solution, in S6, if a pulling test is required, a pulling head is provided at the upper end of the core skeleton, a pulling instrument is connected to the pulling head, and the pulling force is measured.

[0021] The present invention provides a simulated root system based on magnetic expansion mortar and a simulation method thereof, which has the following beneficial effects:

[0022] 1. When studying the soil-fixing mechanisms of plant roots, using real plant materials presents challenges such as high plant cultivation costs, long growth cycles, difficulty controlling parameters, and poor repeatability. The simulated root system provided by this invention utilizes simple materials, is easy to fabricate, is low-cost, and offers strong controllability. To a certain extent, it can replace real plant roots in some experimental studies.

[0023] 2. The present invention can completely reproduce the spatial layout and structure of the entire plant root system. It can not only simulate a single root, but also simulate the entire root system of a plant. The simulation effect is more realistic, and more complex experimental research can be carried out. For example, the relationship between the spatial morphological characteristics of the root system and its soil-fixing function can be studied.

[0024] 3. The present invention can achieve high-precision simulation of the morphological characteristics, growth change process, stress conditions, etc. of various real root systems by adjusting the main test parameters, and can be regulated at all stages of the test, with strong controllability and high flexibility.

[0025] 4. The magnetic expansion mortar used in the present invention has the characteristics of magnetic fluid adsorption under magnetic guidance, and can also expand during molding, thereby quickly simulating the process of plant root growth and expansion, solving the problem of slow plant growth in general plant root research.

[0026] 5. The magnetic expansion mortar used in the present invention is magnetic and can self-aggregate underwater, so it has water-resistant properties and can be used in environments with high water content such as slopes after heavy rain, thereby realizing the study of the soil-fixing ability and mechanism of plants under special working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and examples:

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2This is a schematic diagram of the root system skeleton structure of the present invention;

[0030] Figure 3 Schematic diagram of a circuit of a current controller of the present invention;

[0031] Figure 4 Schematic diagrams of three structures of the iron core skeleton of the present invention;

[0032] Figure 5 This is a comparison diagram of three root skeleton structures of the present invention;

[0033] Figure 6 Schematic diagram of the cross-sectional structure of the simulated root system after the three root skeletons were adsorbed with magnetic expansion mortar;

[0034] Figure 7 To simulate the radial stress diagram of the roots on the soil at different depths and times;

[0035] Figure 8 Diagram of the simulated root diameter change;

[0036] Figure 9 This is a graph showing the porosity of soil around the simulated root system as a function of soil layer distance;

[0037] Figure 10 This is a longitudinal scan of the simulated root system;

[0038] Figure 11 This is a horizontal scan of the simulated root system;

[0039] In the figure: root system skeleton 1, magnetic expansion mortar 2, iron core skeleton 3, coil 4, joint 5, current controller 6, pulling head 7, wire storage tube 8, pressure sensor 9, data processor 10, current interface 601, circuit board 602, insulating shell 603. DETAILED DESCRIPTION

[0040] like Figures 1-2 As shown, a simulated root system based on magnetic expansion mortar includes a root system skeleton 1 and a magnetic expansion mortar 2 coated on the outside of the root system skeleton 1, which together form a simulated root system.

[0041] The root system skeleton 1 includes an iron core skeleton 3. The iron core is made of a material with good magnetic conductivity such as silicon steel and soft iron, and is welded into the shape of a plant root system.

[0042] Coil 4 is wound around the outer side of the core bobbin 3. The free end of coil 4 is provided with a connector 5, which is inserted into the current interface 601 of the current controller 6. There are multiple coils 4, wound in sections around the outer side of the core bobbin 3. Each coil 4 has two connectors 5 that are inserted into the current interface 601 of the current controller 6. Coil 4 is made of insulated copper wire with connectors 5 at each end. The connectors 5 connect to the corresponding current interface 601 on the current controller 6. Connectors 5 can be of various types, such as banana plugs or clips, for easy insertion and removal.

[0043] The root skeleton 1 and the coil 4 together form an electromagnet of the root skeleton 1 structure. The magnetic expansion mortar 2 has a certain fluidity before solidification and can be adsorbed on the surface of the electromagnet. During the solidification process, the volume increases with the expansion of the expansion agent, which is used to simulate the radial growth process of plant roots.

[0044] The magnetic expansion mortar 2 comprises cement mortar, magnetic material particles and an expansion agent. The content of the magnetic material particles is 20% to 30%, and the content of the expansion agent is no more than 30%.

[0045] Preferably, a pulling head 7 is provided at the top of the core frame 3. The pulling head 7 is mounted to the top of the core frame 3 by means of threads or welding. The pulling head 7 is available in various sizes and can be manually replaced to accommodate different types of pulling instruments. The pulling head 7 is used to connect to the pulling instrument during root pulling experiments.

[0046] Preferably, the free ends of the coils 4 are collected by a wire storage tube 8. The wire storage tube 8 is used to store and organize the wires of different coils 4.

[0047] like Figure 2 As shown, the current controller 6 includes a circuit board 602, which is enclosed in an insulating housing 603. The insulating housing 603 has a current interface 601 corresponding to the interface of the circuit board 602. The circuit board 602 has a built-in FPGA circuit that can adjust the amount of power and duration of the current interface 601 in real time, thereby adjusting the magnetic force generated by the electromagnet at the corresponding location, thereby regulating the thickness of the magnetic expansion mortar adsorbed by different parts of the root framework to simulate the root state required for the test.

[0048] like Figure 4 As shown, the current controller 6 can also be composed of several parallel circuits, each of which has a stepless transformer, an indicator light, and a current interface. The stepless transformer can adjust the current, the indicator light shows the power-on status, and the current interface connects to the connector on the coil. After connecting to the power supply, the circuit is completed. The current and power-on time are manually adjusted using the knob of the stepless transformer.

[0049] A pressure sensor 9 is provided on the surface of the magnetic expansion mortar 2 . The pressure sensor 9 and the current controller 6 are connected to a data processor 10 via a data line and a data acquisition circuit.

[0050] The pressure sensor 9 can be a thin film pressure sensor, which can be several in number. Some of the pressure sensors are fixed on the surface of the magnetic expansion mortar 2 adsorbed on the outer layer of the root skeleton 1, and the other parts are buried in the surrounding soil in a certain distribution pattern. They are connected to the data acquisition circuit through a data line, and the data acquisition circuit is further connected to the data processor 10. The data processor 10 displays, records, and performs statistics on the monitoring data. At the same time, the data processor 10 is connected to the current controller 6 to control it.

[0051] A method for simulating a root system based on magnetic expansion mortar comprises the following steps:

[0052] S1. Design a root system model according to experimental needs: determine the spatial distribution morphology of the roots, the number and spatial distribution characteristics of the main roots, and the diameter and length of the main roots. The spatial distribution morphology of the roots includes taproot type and fibrous root type. The number and spatial distribution characteristics of the main roots include the horizontal angle between the main roots, the angle between each main root and the vertical direction, and the distance between each main root.

[0053] S2. Process the root skeleton 1 according to the spatial structure data of the root skeleton 1 designed in S1: First, process the iron core skeleton 3. Through shearing, welding, and other methods, the iron core is shaped into the same spatial structure as the root model. Then, coils 4 are wound around the outside of the processed iron core skeleton 3. There are multiple coils 4, which are wound in sections around the outside of the iron core skeleton 3. The two connectors 5 of each coil 4 are inserted into the current interface 601 of the current controller 6. When the coil 4 is energized, the iron core skeleton 3 and the coil 4 form an electromagnet, generating a magnetic field.

[0054] S3. Preparation of magnetic expansion mortar 2: First, magnetic material particles, expansion agent and fine aggregate for preparing cement mortar are placed in a mixer and stirred to uniformly mix; then cement and water are placed in the mixer and stirred to fully mix to obtain magnetic expansion mortar 2.

[0055] S4. Place the prepared magnetic expansion mortar 2 in a container for later use. Power is supplied to the root framework 1 and placed in the container for magnetic expansion mortar adsorption. Current controller 6 controls the current flowing through coil 4 to control the thickness of the magnetic expansion mortar adsorption. A pressure sensor 9 is positioned on the surface of the magnetic expansion mortar 2 and is connected to a data processor 10 via a data cable. This pressure sensor measures stress data before, during, and after the simulated root expansion is established, and stores this data in the data processor 10.

[0056] S5. Select the soil required for the study, dig a corresponding planting hole in the soil, bury the entire simulated root system prepared in S4 in the planting hole, and compact the soil according to experimental requirements. Connect the pressure sensor 9 to the data acquisition circuit, which is then connected to the data processor 10 via a data line. All stress data of the simulated root system before, during, and after expansion is measured and stored in the data processor 10.

[0057] During the expansion process of the magnetic expansion mortar 2, the current controller 6 adjusts the current, changes the magnetic force, and thus adjusts the radial expansion force during the expansion process. This can also control the diameter and density of the expanded simulated root system. Once the magnetic expansion mortar has expanded and set, the current controller 6 can be disconnected from the power supply.

[0058] S6. Analyze the simulated root system data. The analysis content is determined by the test purpose. For example, the stress condition of the experimental soil, the change pattern of soil density and porosity, and the spatial structure distribution of the soil can be analyzed.

[0059] The present invention can achieve high-precision simulation of the morphological characteristics, growth change process, stress conditions, etc. of various real root systems by adjusting the main test parameters. It can also be regulated at all stages of the test, with strong controllability and high flexibility. The specific parameter adjustment method mainly includes the following three aspects:

[0060] 1. Adjusting the final shape and diameter of the simulated root system during the fabrication of the root skeleton 1. Coil 4 is wound around the outer surface of the iron core skeleton 3 to form an electromagnet. The main factors influencing the final shape and diameter of the simulated root system include the shape and diameter of the iron core skeleton 3 and coil 4, the density of the coil 4 windings, and the current flowing through the coil 4. By adjusting one or more of these factors, the simulated root diameter can be arbitrarily adjusted.

[0061] Specifically, to simulate a single conical root (i.e., the diameter of a single root gradually decreases from top to bottom), commonly used adjustment methods are shown in Table 1. All the methods listed in the table can achieve the simulation effect, but the difficulty of operation and the degree of simulation realism vary.

[0062] Table 1 Comparison of commonly used parameter adjustment methods for single cone morphology simulation

[0063]

[0064] Note: In the table, the greater the difficulty, the more “★” marks there are for the “Operation Difficulty” item; and the higher the realism, the more “★” marks there are for the “Simulation Realism” item.

[0065] Three representative adjustment methods are selected from Table 1 for detailed description:

[0066] The first type, corresponding to No. 2 in Table 1, is a single simulated root system from top to bottom. The diameter of the iron core + coil remains unchanged, and the winding spacing of the coil 4 becomes larger and larger. The winding spacing of the coil 4 becomes larger and larger from top to bottom. When the current is constant, the denser the part of the coil 4, the greater the magnetic force generated by the electromagnet, and the thicker the adsorbed magnetic expansion mortar 2, which can simulate the conical root morphology from coarse to fine.

[0067] The second type, corresponding to No. 4 in Table 1, is a single simulated root system. From top to bottom, the diameter of the iron core + coil gradually decreases, and the winding diameter of coil 4 also gradually decreases. The winding density of coil 4 is the same, and the current size is kept consistent. After power is turned on, the magnetic force of the electromagnet decreases as the diameter of the iron core decreases. Although the amount of this magnetic force change is limited, because the iron core itself is conical, after adsorbing the magnetic expansion mortar, a conical root system morphology from coarse to fine will also be formed.

[0068] The third type, corresponding to serial number 9 in Table 1, is a single simulated root system, in which the diameter of the iron core + coil decreases in sections from top to bottom, that is, the iron core is connected by multiple cylinders arranged in descending diameter, and the winding diameter of the coil 4 is also gradually reduced in sections in a step-like manner. The winding density of the coil 4 is the same, but the connectors 5 of the coil 4 at different parts are connected to different current interfaces 601. The current controller 6 adjusts the current of the coil 4 and thus controls its magnetic force, so that the thickness of the magnetic expansion mortar adsorbed by the root skeleton at different parts is different, thereby forming an approximate root shape with cylindrical segmentation characteristics from coarse to fine.

[0069] 2. During the production of magnetic expansion mortar, by adjusting the ratio of the expansion agent and magnetic material particles, the radial expansion force, diameter after expansion, density and other parameters of the simulated root system can be controlled to a certain extent.

[0070] 3. Adjustment of relevant parameters during the root expansion process. Because the magnetic force of the electromagnet is centripetal, while the expansion mortar can generate centrifugal expansion force, the current intensity of the root skeleton can be adjusted during the expansion of the magnetic expansion mortar to change the magnetic force, thereby adjusting the radial expansion force during the expansion process. Parameters such as the diameter and density of the simulated root system after expansion can also be controlled.

[0071] Through the comprehensive adjustment of multiple test parameters at different stages, simulation of different real root systems under various working conditions can be achieved to meet different test requirements.

[0072] Example 1: Using this simulated root system, the diameter change of the simulated root system and the radial stress generated on the surrounding soil can be monitored in real time and analyzed. The specific method is as follows:

[0073] According to the stress data σ collected by the pressure sensors 9 at different positions on the surface of the simulated root system at fixed time intervals t, the radial stress generated by the simulated root system expansion on the soil at different time and depth can be analyzed, such as Figure 7 shown.

[0074] A CT radiation tube and a detection receiver can also be placed in the soil layer around the simulated root system to detect the changes in the simulated root diameter in real time, such as Figure 8 shown.

[0075] Example 2: Through the simulated root system, the variation pattern of soil density and porosity around the simulated root system, the spatial structure distribution of the soil, etc. can be analyzed. The specific method is as follows:

[0076] After the simulated root expansion is completed, select a good point around the sample using the ring knife method, use an electronic balance to weigh the total weight, subtract the ring knife mass and measure the ring knife diameter and height to calculate the soil mass m, volume v, and calculate the wet density ρ using the formula ω = m / v, place the retrieved sample in an oven, dry it using the drying method, air dry it and cool it, then weigh it to obtain the dry soil mass m s , the moisture content ω=(mm s ) / m s *100%, and dry density ρ d =ρ ω / (1+ω); Then the specific gravity of the dried soil is measured using the pycnometer method to obtain the specific gravity G s , and since the specific gravity of soil is defined as the weight of the soil when it is dried to constant weight and the weight of the soil of the same volume at 4C o The ratio of the weight of distilled water, that is, G s =m s / (v s *ρ 水 ), ρ 水 is the density of water, usually 1g / cm 3 , we can use the formula to derive the volume of soil v s =m s / G s ; Then continue to derive the formula to calculate the porosity n=(vv s ) / v=1-v s / v; Finally, the soil is compacted and tested to obtain the maximum dry density ρ dm , and the degree of compaction K = ρ is obtained d / ρ dm At different points and depths of the simulated root surrounding soil, the ring knife method was used to sample the soil. The porosity and compaction were calculated by the above steps, and the spatial horizontal and vertical analysis and comparison were performed to obtain the change pattern of the density and porosity of the simulated root surrounding soil under different expansion diameters, such as Figure 9shown.

[0077] Based on the data from pressure sensors placed at fixed distances at different depths around the simulated root system, the trend of changes in the expansion stress generated by the simulated root system in the soil is analyzed along with the trend of changes in the soil porosity and density, thereby obtaining the distribution change pattern of the soil spatial structure. Alternatively, after the expansion is complete, the entire simulated root system including the surrounding soil is excavated and subjected to horizontal and vertical CT scans, such as Figure 10 and 11 According to the CT value and the expansion stress, a joint analysis is conducted to obtain the distribution change law of the soil spatial structure.

[0078] Furthermore, relevant experiments can be conducted on simulated plant roots, such as root pullout tests. To perform a pullout test, a pullout head 7 is installed at the upper end of the core frame 3, and a pullout instrument is connected to the pullout head 7 to measure the pullout resistance. Parameters such as the size and surface friction coefficient of the simulated root after extraction can also be measured, providing data related to the expanded root system for further analysis.

Claims

1. A simulated root system based on magnetic expansion mortar, characterized in that: The invention comprises a root system skeleton (1) and a magnetic expansion mortar (2) coated on the outside of the root system skeleton (1); the root system skeleton (1) comprises an iron core skeleton (3); a coil (4) is wound around the outside of the iron core skeleton (3); a connector (5) is provided at the free end of the coil (4); and the connector (5) is inserted into the current interface (601) of the current controller (6).

2. The simulated root system based on magnetic expansion mortar according to claim 1, characterized in that: The magnetic expansion mortar (2) comprises cement mortar, magnetic material particles and an expansion agent, wherein the content of the magnetic material particles is 20% to 30%, and the content of the expansion agent is no more than 30%.

3. The simulated root system based on magnetic expansion mortar according to claim 1, characterized in that: A drawing head (7) is provided at the upper end of the iron core skeleton (3).

4. The simulated root system based on magnetic expansion mortar according to claim 1, characterized in that: The free ends of the coils (4) are collected through a wire receiving tube (8).

5. The simulated root system based on magnetic expansion mortar according to claim 1, characterized in that: The current controller (6) comprises a circuit board (602), the circuit board (602) is covered with an insulating shell (603), and a current interface (601) is provided on the insulating shell (603) corresponding to an interface of the circuit board (602).

6. The simulated root system based on magnetic expansion mortar according to claim 1, characterized in that: A pressure sensor (9) is provided on the surface of the magnetic expansion mortar (2), and the pressure sensor (9) and the current controller (6) are connected to a data processor (10) via a data line.

7. The simulated root system based on magnetic expansion mortar according to claim 1, characterized in that: The diameter of a single root system of the iron core skeleton (3) is consistent from top to bottom, the winding spacing of the coil (4) increases from top to bottom, and the current of the coil (4) is consistent; or, the diameter of a single root system of the iron core skeleton (3) gradually decreases from top to bottom, and the current of the coil (4) is consistent; or, the diameter of a single root system of the iron core skeleton (3) gradually decreases in a step-like manner from top to bottom, and the current of the coil (4) of the single root system decreases in a step-like manner from top to bottom.

8. The root system simulation method based on magnetic expansion mortar according to any one of claims 1 to 7, characterized in that: The steps include: S1. Design a root system model based on experimental needs: determine the spatial distribution morphology of the root system, the number and spatial distribution characteristics of the main roots, and the diameter and length of the main roots. The spatial distribution morphology of the root system includes taproot and fibrous root types. The number and spatial distribution characteristics of the main roots include the horizontal angle between the main roots, the angle between each taproot and the vertical direction, and the distance between each taproot. S2. Processing the root skeleton (1) according to the spatial structure data of the root skeleton (1) designed in S1: first, processing the iron core skeleton (3), and then winding the coil (4) on the outside of the iron core skeleton (3). The number of coils (4) is multiple, and they are wound in sections on the outside of the iron core skeleton (3). The two connectors (5) of each coil (4) are inserted into the current interface (601) of the current controller (6); S3, preparing magnetic expansion mortar (2): first, magnetic material particles, expansion agent and fine aggregate for preparing cement mortar are placed in a mixer and stirred to uniformly mix; then, cement and water are placed in the mixer and stirred to fully mix to obtain magnetic expansion mortar (2); S4, placing the prepared magnetic expansion mortar (2) in a container for standby use, energizing the root skeleton (1) and placing it in the container for magnetic expansion mortar adsorption, and controlling the current of the coil (4) by the current controller (6) to control the adsorption thickness of the magnetic expansion mortar; S5. Select the soil required for the study, dig a corresponding planting pit in the soil, bury the entire simulated root system prepared in S4 in the planting pit, and compact the soil according to the experimental needs. After the magnetic expansion mortar (2) expands and takes shape, the power supply of the current controller (6) can be disconnected; S6. Analyze the simulated root system data.

9. The root system simulation method based on magnetic expansion mortar according to claim 8, characterized in that: In the above-mentioned S4, a pressure sensor (9) is provided on the surface of the magnetic expansion mortar (2), and the pressure sensor (9) is connected to the data processor (10) via a data line to measure stress data before, during, and after the expansion of the simulated root system is completed, and store the stress data in the data processor (10).

10. The root system simulation method based on magnetic expansion mortar according to claim 8, characterized in that: In the above-mentioned S6, if a pulling test is required, a pulling head (7) is provided at the upper end of the core skeleton (3), a pulling instrument is connected to the pulling head (7), and the pulling resistance is measured.

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