Distributed coupling compensation active regulation method for multi-physical field boundary of geologic body physical model test

Abstract

The application provides a distributed coupling compensation active regulation method for a multi-physical field boundary of a geologic body physical model test, comprising the following steps: S1, pre-position calibration test; S2, analyzing preset multi-field coupling working condition target values and decoupling into local control instructions of each unit; S3, carrying out model test and acquiring real-time data of the geologic body physical model; and S4, real-time dynamic regulation of the multi-physical field boundary and triggering adaptive compensation adjustment in an abnormal situation. The application can accurately simulate a complex multi-field coupling geologic environment, completely eliminates mutual interference between fields, improves boundary regulation accuracy, solves seepage distortion problems and is suitable for high-precision physical model tests of rock-soil engineering, geologic disasters, energy underground engineering and the like.

Description

Technical Field

[0001] This invention relates to the field of physical model testing in geological engineering and geotechnical engineering, specifically to a distributed coupling compensation active control method for multi-physics field boundaries in physical model testing of geological bodies. Background Technology

[0002] Geological physical model tests are the core means of restoring the mechanical behavior of rock and soil and revealing the mechanism of geological disasters. Accurately simulating the multi-field coupled environment of stress field, temperature field and seepage field is the core prerequisite for ensuring the reliability of the test.

[0003] Existing model test boundary control techniques suffer from significant technical bottlenecks: the boundaries of multiple physical fields such as stress, temperature, and seepage exhibit strong mutual interference characteristics. Temperature changes can induce boundary thermal stress deformation, stress loads can alter the contact thermal conductivity of the medium, and seepage pressure fluctuations can affect interfacial heat conduction and sealing stability. The mutual interference of multiple physical field boundaries makes it difficult to accurately control the model test boundaries, and boundary conditions can deviate from the set values ​​due to the influence of other physical fields.

[0004] Existing technologies can only independently develop single-physics boundary control kits, which are then applied to experiments using simple assembly methods. Without a coupling compensation mechanism, they cannot solve the core problem of mutual interference between multiple physics boundaries.

[0005] Meanwhile, traditional stress boundaries employ overall rigid loading, which cannot achieve precise non-uniform control; temperature boundaries use coarse temperature control across the entire domain or at specific points, resulting in low gradient control accuracy; seepage boundaries easily form dominant seepage channels, distorting the seepage path; and existing technologies can only passively adjust and compensate after detecting anomalies in multi-physics field boundaries, unable to avoid disturbing other boundaries when controlling a single boundary, and unable to achieve active control, i.e., actively controlling control commands based on the coupling mechanism between multi-physics fields to avoid abnormal situations. This leads to severe distortion of the multi-field boundaries of the geological body physical model, failing to meet the requirements of high-precision geological body physical model testing.

[0006] To address the aforementioned shortcomings, there is an urgent need for a distributed coupling compensation active control technology that can achieve precise point-by-point control of boundaries, possess active compensation capabilities for multi-field interference, and enable collaborative and interference-free regulation. This technology would enable precise control and realistic application of multi-physics field boundaries without interference, ensuring that experimental results are realistic, controllable, and more accurate. Ultimately, it would facilitate accurate simulation and nationwide research of the true properties of multi-physics field coupling effects on geological bodies. Summary of the Invention

[0007] This invention is made to solve the problems of mutual interference between multi-physics field boundaries, low control accuracy, and lack of coupling compensation mentioned above. The purpose is to provide a distributed coupling compensation active control method for multi-physics field boundaries in geological body physical model experiments.

[0008] This invention provides a distributed coupling compensation active control method for multi-physics field boundaries in geological body physical model experiments, comprising the following steps:

[0009] S1. Based on the stress, temperature, and seepage multi-physics field distribution characteristics of the geological body physical model, the inner wall of the model test chamber is divided into grid-like partitions. Modular coupled boundary control units and distributed sensor components are deployed in each partition and controlled by a central controller. Each modular coupled boundary control unit integrates a rigid actuator, gradient damping material, flexible sheet-like unidirectional temperature controller and functional gradient interface material from the outside to the inside.

[0010] S2. Conduct a pre-calibration test. Within the modular coupling boundary control unit, calibrate the thermal conductivity data of the functionally graded interface material under different permeation pressures to establish a permeation pressure-thermal conductivity correlation database. Also, calibrate the thermal stress response data of the high thermal conductivity flexible substrate in the flexible sheet-like unidirectional temperature controller to establish a temperature change-stress shift correlation database.

[0011] S3. Based on the calibration data obtained in step S2, the target value of the preset multi-field coupling working condition is analyzed, and the target value is decoupled into local control commands of each modular coupling boundary control unit. The local control commands are then fine-tuned according to the multi-physics field association data in the corresponding association database in step S2, thereby actively regulating the multi-physics field boundary of the geological body physical model to eliminate interference.

[0012] S4, conduct model tests, the central controller acquires real-time data on stress, temperature and seepage of the physical model of the geological body through various distributed sensor components;

[0013] S5, the central controller dynamically adjusts the multi-physics field boundary of the geological body physical model according to real-time data. When the multi-physics field boundary is abnormal, it triggers adaptive compensation adjustment. The adaptive compensation adjustment includes stress compensation to offset temperature interference, temperature compensation to offset seepage-stress interference, and seepage control to seal boundary leakage until the boundary state meets the design scheme.

[0014] The distributed coupling compensation active control method for multi-physics field boundary in geological physical model tests provided by this invention may also have the following features: distributed sensor components are connected to each modular coupling boundary control unit, and the distributed sensor components include pressure sensors, temperature sensors, and seepage pressure sensors; the central controller is communicatively connected to the modular coupling boundary control unit and the distributed sensor components, and is used to adjust the parameters of the rigid actuator and the flexible sheet-like unidirectional temperature controller during the model experiment based on the stress, temperature, and seepage data measured by the distributed sensor components.

[0015] The distributed coupling compensation active control method for the boundary of multiple physics fields in the geological body physical model test provided by the present invention may also have the following features: In step S3, the process of actively controlling the boundary of multiple physics fields of the geological body physical model includes: when the boundary condition of a certain physical field changes and interferes with the boundary conditions of other physical fields, according to the permeability pressure-thermal conductivity correlation database and the temperature change-stress offset correlation database in step S2, the boundary control command of the corresponding modular coupling boundary control unit is generated synchronously to actively eliminate the interference.

[0016] The distributed coupling compensation active control method for the boundary of a geological body physical model test provided by this invention may also have the following features: in the modular coupling boundary control unit, the functional gradient interface material contains an electrochromic permeability coefficient element, and the permeability coefficient of the electrochromic permeability coefficient element is gradient distributed along the thickness direction.

[0017] The distributed coupling compensation active control method for multi-physics field boundary in geological body physical model test provided by this invention may also have the following features: In step S5, the stress compensation process includes: the central controller drives the rigid actuator to perform load compensation based on real-time temperature data and calibrated thermal stress response data, eliminating the interference of thermal deformation and thermal stress on the stress boundary caused by temperature rise and fall; the temperature compensation process includes: the central controller dynamically corrects the output power of the flexible sheet-like unidirectional temperature controller based on real-time seepage pressure and calibrated thermal conductivity data, eliminating the interference of stress and seepage boundary changes on the temperature boundary; the seepage control process includes: the central controller adjusts the permeability coefficient of the electrochromic permeability coefficient element based on real-time seepage data, avoiding the formation of dominant seepage channels at the boundary and thus preventing seepage concentration.

[0018] The distributed coupling compensation active control method for the boundary of a geological body physical model test provided by this invention can also have the following feature: in each modular coupling boundary control unit, the stiffness gradient of the gradient damping material of each modular coupling boundary control unit matches the modulus distribution of the geological body physical model.

[0019] The distributed coupling compensation active control method for the boundary of multiple physical fields in the geological body physical model test provided by the present invention may also have the following features: in the modular coupling boundary control unit, the flexible sheet-like unidirectional temperature controller includes a highly thermally conductive flexible substrate and a thin-film thermoelectric cooling heating element, and the thin-film thermoelectric cooling heating element is connected to the central controller.

[0020] The distributed coupling compensation active control method for the boundary of multi-physics field in geological body physical model test provided by the present invention may also have the following feature: in the modular coupling boundary control unit, the rigid actuator is an electro-hydraulic servo actuator, which is independently controlled by the PID program built into the central controller.

[0021] The distributed coupling compensation active control method for geological body physical model test multiphysics field boundary provided by the present invention may also have the following feature: adjacent modular coupling boundary control units are interconnected through standardized mechanical and electrical interfaces.

[0022] The distributed coupling compensation active control method for the boundary of multiphysics field in geological physical model test provided by the present invention may also have the following feature: the side of the modular coupling boundary control unit is provided with sealing material to seal the boundary leakage.

[0023] Compared with the prior art, the functions and effects of the present invention include:

[0024] The present invention provides a distributed coupling compensation active control method for the boundary of multi-physics field in geological body physical model tests. It adopts an array-distributed modular coupling boundary control unit, deconstructs the macroscopic boundary into independent control nodes, and realizes precise and independent control of stress, temperature and seepage at each point of the geological body model boundary. It can simulate any non-uniform complex multi-physics field. Its modular and standardized design can be adapted to multiple working conditions for rapid reconstruction, has strong versatility, and can significantly improve the stability, repeatability and fidelity of multi-field coupling simulation.

[0025] In the distributed coupling compensation active control method for the boundary of multi-physics field in the geological body physical model test of the present invention, the functional gradient interface material and the sealing material on the side of the unit in the modular coupling boundary control unit work together to completely suppress the boundary dominant seepage channel and solve the problems of seepage concentration and path distortion in traditional tests.

[0026] In the distributed coupling compensation active control method for multi-physics field boundaries in the geological body physical model test of the present invention, by calibrating the material properties, establishing a correlation database of seepage pressure-thermal conductivity and a correlation database of temperature change-stress offset, and generating active control local control commands, adaptive compensation adjustment is triggered when anomalies occur at the multi-physics field boundaries, completely eliminating the bidirectional interference of seepage-stress on temperature and temperature-stress, and achieving disturbance-free and precise control of seepage, temperature and stress boundaries. This breaks through the limitations of traditional technology of independent assembly of a single field, and achieves the effect of coordinated and precise control of multiple boundaries without interfering with other boundaries. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the internal structure of the model test chamber in an embodiment of the present invention.

[0028] Figure 2 It is a modular coupling boundary control unit in the embodiments of the present invention.

[0029] Figure 3This is a flowchart of the distributed coupling compensation active control method for the boundary of multiphysics field in geological body physical model test in an embodiment of the present invention.

[0030] In the figure: 1. Model test chamber; 2. Modular coupled boundary control unit; 21. Rigid actuator; 22. Gradient damping material; 23. Flexible sheet-like unidirectional temperature controller; 24. Functionally graded interface material; 25. Sealing ring; 3. Distributed sensor assembly; 4. Central controller. Detailed Implementation

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the following embodiments, in conjunction with the accompanying drawings, specifically illustrate the distributed coupling compensation active control method for multi-physics field boundaries in geological body physical model experiments of this invention.

[0033] Figure 3 This is a flowchart of the distributed coupling compensation active control method for the boundary of multiphysics field in geological body physical model test in an embodiment of the present invention.

[0034] This embodiment provides a distributed coupling compensation active control method for multi-physics field boundaries in geological body physical model experiments, such as... Figure 3 As shown: This includes the following steps S1-S5.

[0035] S1. Based on the stress, temperature, and seepage multi-physics field distribution characteristics of the geological body physical model, the inner wall of the model test chamber 1 is divided into grid-like partitions. Modular coupled boundary control units 2 and distributed sensor components 3 are deployed in each partition, and controlled by a central controller 4.

[0036] Figure 1 This is a schematic diagram of the internal structure of the model test chamber 1 in an embodiment of the present invention.

[0037] Specifically, such as Figure 1As shown: A geological physical model is installed inside the model test chamber 1. Based on the stress gradient, temperature zoning, and seepage path characteristics of geological physical models such as cold-region soil and rock, and underground energy engineering, the inner wall of the model test chamber 1 is divided into 5cm×5cm grid zones. A modular coupled boundary control unit 2, capable of independent movement and control, is deployed at the corresponding location of each zone, thus forming a global distributed control array. This constructs a coupled compensation boundary composed of multiple distributed control nodes, thereby achieving precise control of each point on the model boundary and providing a hardware foundation for multi-field decoupling and compensation-control. Adjacent modular coupled boundary control units 2 are interconnected via standardized mechanical and electrical interfaces.

[0038] Figure 2 This is a schematic diagram of the modular coupling boundary control unit 2 in an embodiment of the present invention.

[0039] like Figure 2 As shown: Each modular coupling boundary control unit 2 integrates a rigid actuator 21, a gradient damping material 22, a flexible sheet-like unidirectional temperature controller 23, and a functional gradient interface material 24 from the outside to the inside.

[0040] Specifically, in this embodiment, the rigid actuator 21 is a micro electro-hydraulic servo actuator, or a micro electric cylinder can be used. It is independently controlled by the PID program built into the central controller 4. It has a fast response speed and high control accuracy, thereby dynamically adjusting the expansion and contraction load through pressure monitoring data feedback, simulating the formation radiation damping, and constructing a controllable stress boundary.

[0041] The damping material is a composite damping material, and its stiffness is designed with a gradient based on the modulus distribution of the geological body physical model, that is, the gradient decreases from the edge to the center of the model, which has both load transfer and wave absorption functions. The gradient damping material 22 is installed at the piston end of the rigid actuator 21 of the corresponding modular coupled boundary control unit 2 to simulate the radiation damping effect of real strata.

[0042] The flexible sheet-like unidirectional temperature controller 23 is attached to the surface of the gradient damping material 22, adapting to unit deformation without affecting mechanical and thermal performance. In this embodiment, the high thermal conductivity flexible substrate in the flexible sheet-like unidirectional temperature controller 23 is made of high thermal conductivity silicone, with an embedded thin-film thermoelectric element, and is connected to the PID temperature control program built into the central controller. The unit temperature control accuracy is ±0.2℃, which is used to achieve independent and precise control of the temperature boundary of each zone.

[0043] Functionally graded interface material 24 is coated on flexible sheet-like unidirectional temperature controller 23, with a material permeability coefficient of 10 along the thickness direction. ﹣8 ~10 ﹣10 cm / s gradient distribution, with built-in electrochromic osmosis element.

[0044] Each modular coupling boundary control unit 2 is filled with weather-resistant sealing material on its side. In this embodiment, the sealing material is a fluororubber high-elasticity sealing ring 25, which is resistant to freeze-thaw cycles of -40℃ to 120℃. This ensures that the modular coupling boundary control unit 2 remains sealed when moving relative to each other, preventing the boundary from forming a dominant seepage channel. Together with the gradient damping material 22, it controls the seepage to concentrate inside the physical model of the geological body, thus solving the problem of boundary seepage concentration distortion.

[0045] The distributed sensor component 3 integrates pressure sensors, temperature sensors, and seepage pressure sensors, and is embedded in the modular coupled boundary control unit 2 or pre-embedded in the physical model of the geological body, for real-time full acquisition of multi-physics field data.

[0046] The central controller 4 is equipped with an industrial control motherboard, with built-in algorithm programs and databases. It is used to adjust the parameters of the rigid actuator 21 and the flexible sheet-like one-way temperature controller 23 during the model experiment based on the stress, temperature and seepage data measured by the distributed sensor component 3, so as to realize fully automatic closed-loop control.

[0047] S2, conduct pre-calibration experiments and establish a two-dimensional correlation database.

[0048] Specifically, under a permeation pressure gradient of 0–2 MPa, the thermal conductivity of the functionally graded interface material 24 was calibrated under different permeation pressures. The influence of permeation-stress load on the interface thermal conductivity was quantified, and a permeation pressure-thermal conductivity mapping table was established. In the temperature range of -20℃ to 60℃, the stress shift caused by thermal deformation of the high thermal conductivity flexible substrate in the flexible sheet-like unidirectional temperature controller 23 was tested. The shift law of boundary stress due to temperature changes was quantified, and a temperature-stress mapping table was established. Then, the pressure-thermal conductivity mapping table and the temperature-stress mapping table were stored in the database of the central controller 4.

[0049] S3, the central controller 4 analyzes the preset multi-field coupling working condition target value based on the calibration data obtained in step S2, decouples the target value into local control commands of each modular coupling boundary control unit 2, and fine-tunes the local control command according to the multi-physics field association data in the corresponding association database in step S2, thereby actively regulating the multi-physics field boundary of the geological body physical model to eliminate interference.

[0050] Specifically, the central controller 4 incorporates a temperature control power adaptive adjustment algorithm, a thermal stress automatic compensation algorithm, and a multi-physics field boundary active compensation-control feedback algorithm. The temperature control power adaptive adjustment algorithm dynamically corrects the heating or cooling power of the flexible sheet-like unidirectional temperature controller 23, offsetting the interference of stress and seepage boundary changes on the temperature boundary. The thermal stress automatic compensation algorithm drives the rigid actuator 21 to automatically compensate for the load while controlling the temperature, offsetting the interference of temperature changes on the stress boundary. The multi-physics field boundary active compensation-control feedback algorithm is developed based on a three-field interaction mechanism. The central controller 4 uses these algorithms to coordinate the three-field coupling relationship, analyze the macroscopic multi-field coupling operating condition target value, and decouple it into local control commands for each modular coupling boundary control unit 2.

[0051] Furthermore, the process of actively regulating the multi-physics boundary of the geological body physical model includes the following: when a physical field boundary condition changes and interferes with other physical field boundary conditions, according to the permeability pressure-thermal conductivity correlation database and temperature change-stress offset correlation database in step S2, the corresponding modular coupled boundary control unit boundary control command is generated synchronously to actively eliminate the interference.

[0052] For example, the initial state of the model is: temperature 20℃, stress 100kPa. Now, the boundary control parameters need to be adjusted to temperature -10℃ and stress 100kPa. Existing methods use passive compensation to directly cool the model, keeping the stress control command unchanged. However, during this process, due to temperature changes, the modulus of the model itself and the modulus of the boundary thermally conductive material will change, thus altering the actual stress applied to the model under the same stress control command. The pressure sensor then detects the stress anomaly and adjusts the stress accordingly. However, because the temperature is constantly changing during cooling, the stress adjustment always lags behind the temperature change, ultimately resulting in inaccurate stress values ​​before temperature stabilization. This invention employs active control. Using the calibration data from step S2, the relationship between temperature changes and stress changes is known. Then, during cooling, the local stress control command is adjusted synchronously based on the known relationships between related data, preventing anomalies from occurring at the source and actively eliminating interference.

[0053] S4, Conduct model tests. The central controller 4 acquires real-time data of the physical model of the geological body through each distributed sensor component 3.

[0054] S5, the central controller 4, dynamically adjusts the multi-physics field boundaries in real time. When the multi-physics field boundaries are abnormal, adaptive compensation adjustment is triggered. Without affecting other boundary conditions, each physical field boundary is precisely and independently adjusted until the boundary state meets the design scheme.

[0055] The adaptive compensation adjustment includes stress compensation, temperature compensation, and seepage compensation. Stress compensation counteracts temperature interference, temperature compensation counteracts seepage-stress interference, and seepage control seals boundary leakage.

[0056] Specifically, the stress compensation central controller 4, based on real-time temperature data and calibrated thermal stress response data, drives the rigid actuator 21 to perform load compensation through an automatic thermal stress compensation algorithm when the seepage pressure increases and the thermal conductivity decreases, thereby eliminating the interference of thermal deformation and thermal stress on the stress boundary caused by temperature rise and fall.

[0057] Based on real-time permeation pressure and calibrated thermal conductivity data, the central controller 4 dynamically corrects the output power of the flexible sheet-like unidirectional temperature controller 23 through a temperature control power adaptive adjustment algorithm when local stress shifts due to temperature rise, in order to perform temperature compensation and eliminate the interference of stress and permeation boundary changes on the temperature boundary.

[0058] Based on real-time seepage data, the central controller 4 adjusts the permeability coefficient of the electrochromic permeability coefficient element to seal the boundary leakage when leakage occurs at the boundary.

[0059] It achieves precise control without interference across multiple boundaries throughout the entire process, and adaptively compensates to the design conditions when boundary anomalies occur.

[0060] The role and effect of the embodiments

[0061] The distributed coupling compensation active control method for the boundary of multi-physics field in the geological body physical model test of this embodiment adopts an array-distributed modular coupling boundary control unit 2, deconstructing the macroscopic boundary into independent control nodes, realizing precise and independent control of stress, temperature and seepage at each point of the geological body model boundary, which can simulate any non-uniform complex multi-physics field. Its modular and standardized design can be adapted to multiple working conditions for rapid reconstruction, with strong versatility, and can greatly improve the stability, repeatability and fidelity of multi-field coupling simulation of the test.

[0062] In the distributed coupling compensation active control method of the multi-physics field boundary in the geological body physical model test of this embodiment, the functional gradient interface material 24 in the modular coupling boundary control unit 2 and the sealing material on the side of the unit work together to completely suppress the boundary dominant seepage channel and solve the problems of seepage concentration and path distortion in traditional tests.

[0063] In the distributed coupling compensation active control method for multi-physics field boundaries in the geological body physical model test of this embodiment, by calibrating the material properties, establishing a correlation database of seepage pressure-thermal conductivity and a correlation database of temperature change-stress offset, and generating active control local control commands, adaptive compensation adjustment is triggered when anomalies occur at the multi-physics field boundaries, completely eliminating the bidirectional interference of seepage-stress on temperature and temperature-corresponding stress, and achieving undisturbed and precise control of seepage temperature and stress boundaries. This breaks through the limitations of traditional single-field independent assembly and achieves the effect of multi-boundary coordinated and precise control without interfering with other boundaries.

[0064] In summary, this embodiment can accurately simulate complex multi-field coupled geological environments, completely eliminate mutual interference between fields, and fully solve the problem of seepage simulation. It is suitable for high-precision physical model tests in geotechnical engineering, geological disasters, underground energy engineering, and other fields.

[0065] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A distributed coupling compensation active control method for multiphysics field boundaries in geological body physical model experiments, characterized in that, The method includes the following steps: S1. Based on the stress, temperature, and seepage multi-physics field distribution characteristics of the geological body physical model, the inner wall of the model test chamber is divided into grid-like partitions. Modular coupled boundary control units and distributed sensor components are deployed in each partition and controlled by a central controller. Each modular coupled boundary control unit integrates a rigid actuator, gradient damping material, flexible sheet-like unidirectional temperature controller, and functional gradient interface material from the outside to the inside. S2, Conduct a pre-calibration test. Within the modular coupling boundary control unit, calibrate the thermal conductivity data of the functionally graded interface material under different permeation pressures to establish a permeation pressure-thermal conductivity correlation database. Also, calibrate the thermal stress response data of the high thermal conductivity flexible substrate in the flexible sheet-like unidirectional temperature controller to establish a temperature change-stress offset correlation database. S3, based on the calibration data obtained in step S2, analyze the preset multi-field coupling working condition target value, decouple the target value into local control commands of each modular coupling boundary control unit, and fine-tune the local control commands according to the multi-physics field association data in the corresponding association database in step S2, thereby actively regulating the multi-physics field boundary of the geological body physical model to eliminate interference; S4, Conduct model tests. The central controller acquires real-time data on stress, temperature, and seepage of the physical model of the geological body through the distributed sensor components. S5, the central controller dynamically adjusts the multi-physics field boundary of the geological body physical model according to real-time data. When the multi-physics field boundary is abnormal, it triggers adaptive compensation adjustment. The adaptive compensation adjustment includes stress compensation to offset temperature interference, temperature compensation to offset seepage-stress interference, and seepage control to seal boundary leakage until the boundary state meets the design scheme.

2. The distributed coupling compensation active control method for multiphysics field boundaries in geological body physical model experiments according to claim 1, characterized in that: in, The distributed sensor assembly is connected to each of the modular coupled boundary control units, and the distributed sensor assembly includes a pressure sensor, a temperature sensor, and a osmotic pressure sensor. The central controller is communicatively connected to the modular coupled boundary control unit and the distributed sensor assembly, and is used to adjust the parameters of the rigid actuator and the flexible sheet-like unidirectional temperature controller during the model experiment based on the stress, temperature and seepage data measured by the distributed sensor assembly.

3. The distributed coupling compensation active control method for multiphysics field boundaries in geological body physical model experiments according to claim 1, characterized in that: In step S3, the process of actively controlling the multi-physics boundary of the geological body physical model includes: when a physical field boundary condition changes and interferes with other physical field boundary conditions, according to the permeability pressure-thermal conductivity correlation database and the temperature change-stress offset correlation database in step S2, the corresponding boundary control command of the modular coupled boundary control unit is generated synchronously to actively eliminate the interference.

4. The distributed coupling compensation active control method for multiphysics field boundaries in geological body physical model experiments according to claim 1, characterized in that: In the modular coupled boundary control unit, the functionally graded interface material includes electrochromic permeability elements with permeability gradients distributed along the thickness direction.

5. The distributed coupling compensation active control method for multiphysics field boundaries in geological body physical model tests according to claim 4, characterized in that: In step S5, the stress compensation process includes: the central controller drives the rigid actuator to perform load compensation based on real-time temperature data and calibrated thermal stress response data, thereby eliminating the interference of thermal deformation and thermal stress on stress boundaries caused by temperature rise and fall. The temperature compensation process includes: the central controller dynamically corrects the output power of the flexible sheet-like unidirectional temperature controller based on real-time permeation pressure and calibrated thermal conductivity data, eliminating the interference of stress and permeation boundary changes on the temperature boundary; The seepage control process includes: the central controller adjusting the permeability coefficient of the electrochromic permeability coefficient element according to real-time seepage data to avoid the formation of dominant seepage channels at the boundary and thus prevent seepage concentration.

6. The distributed coupling compensation active control method for multiphysics field boundaries in geological body physical model tests according to claim 1, characterized in that: In each of the modular coupled boundary control units, the stiffness gradient of the gradient damping material matches the modulus distribution of the physical model of the geological body.

7. The distributed coupling compensation active control method for multiphysics field boundaries in geological body physical model experiments according to claim 1, characterized in that: In the modular coupling boundary control unit, the flexible sheet-like unidirectional temperature controller includes a highly thermally conductive flexible substrate and a thin-film thermoelectric heating element, which is connected to the central controller.

8. The distributed coupling compensation active control method for multiphysics field boundaries in geological body physical model experiments according to claim 1, characterized in that: In the modular coupling boundary control unit, the rigid actuator is an electro-hydraulic servo actuator, which is independently controlled by the PID program built into the central controller.

9. The distributed coupling compensation active control method for multiphysics field boundaries in geological body physical model tests according to claim 1, characterized in that: The adjacent modular coupling boundary control units are interconnected via standardized mechanical and electrical interfaces.

10. The distributed coupling compensation active control method for multiphysics field boundaries in geological body physical model experiments according to claim 1, characterized in that: in, The modular coupling boundary control unit has a sealing material on its side to prevent boundary leakage.

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