Dynamic safety monitoring protection device for CT real-time triaxial experiment

Abstract

The invention provides a dynamic safety monitoring protection device for a CT real-time triaxial experiment. The dynamic safety monitoring protection device is characterized in that a protection mechanism is composed of a waterproof cover top and a sealing rubber ring; the top of the waterproof cover covers the top end of a CT scanning rotary sample bearing table on the CT scanning system, the bottom of the waterproof cover is fixed through a springback supporting foot stool, and the top of the waterproof cover is in sealed connection with the bottom end of the triaxial loading cylinder through a sealing rubber ring; the water storage tank surrounds the top of the CT scanning rotary sample bearing table and collects water leaked from the triaxial loading cylinder; the monitoring alarm mechanism comprises a water storage tank and a water level measurement alarm; a buoy of the water level measurement alarm is located in the water storage tank and triggers the conducting strip to make contact with the metal conductor block along with rising of the water level, and the audible and visual alarm is started. A physical isolation layer is formed through the waterproof cover top and the sealing rubber ring, confining pressure water is prevented from directly permeating into a CT scanning system, and equipment corrosion and experiment interruption are avoided; the water storage tank collects leaked water, the water level measurement alarm triggers sound-light alarm through the buoy and the conducting strip, instant response of leakage is achieved, and experiment safety is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of rock mechanics experiments, and in particular to a dynamic safety monitoring and protection device for CT real-time triaxial experiments. Background Art

[0002] The study of the mechanical properties of coal and rock masses is a core topic in the field of rock mechanics. Its findings provide a theoretical foundation for revealing coal and rock failure mechanisms and assessing the stability of underground engineering projects. Simulating the stress-strain response of coal and rock masses under compression through real-time triaxial loading CT mechanical experiments is a key method for revealing the mechanisms of internal crack propagation, weak plane evolution, and energy release.

[0003] Existing Technology: Advantages of CT real-time triaxial testing: CT real-time triaxial mechanical testing, through simultaneous loading and scanning, can dynamically capture microstructural changes within coal and rock masses. These include: visualization of the failure process: real-time observation of crack initiation, weak plane penetration, and particle breakage; precise parameter acquisition: measurement of mechanical parameters such as full-scale strain and volume change, overcoming the limitations of conventional experimental methods (such as uniaxial compression and acoustic emission monitoring). Key drawbacks of existing technology: Despite its significant advantages, CT triaxial testing, using water pressure as the axial / circumferential pressure source presents the following issues: risk of water leakage and equipment corrosion; leakage triggers; specimen damage: sharp fractures caused by coal and rock fractures can easily pierce the silicone sleeve; seal failure: the seal of the triaxial loading cylinder can fail due to shearing or aging caused by high pressure (>30 MPa); and hazard; experiment interruption: leaking water can flow through the cylinder top hole into the rotating scanning sample stage and electric servo slide, forcing the experiment to terminate. Equipment damage: accumulated water is difficult to completely clean, and long-term corrosion can lead to functional degradation of precision components (such as the CT detector guide rails), resulting in high repair costs. Real-time alarm processing: Water leaks in the scanning area cannot be discovered in time during the experiment, making it difficult to respond immediately to leaks after an accident occurs, increasing the risk of equipment damage.

[0004] Existing protection solutions (such as single silicone sleeves and fixed waterproof covers) cannot simultaneously address dynamic leak monitoring, efficient flow diversion protection, and experimental continuity. Therefore, developing a device that integrates real-time monitoring, multi-stage sealing, and active protection has become a key technical requirement for improving the safety and data reliability of CT triaxial experiments. Summary of the Invention

[0005] To solve the above problems, the present invention aims to propose a dynamic safety monitoring and protection device for CT real-time triaxial experiments. Based on the collaborative mechanism of dynamic pressure loading, real-time CT scanning and multi-level safety protection, the triaxial mechanical experiments can be carried out safely and reliably.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A dynamic safety monitoring and protection device for CT real-time triaxial experiments, comprising: a protection mechanism consisting of a waterproof cover top and a sealing rubber ring;

[0008] The waterproof cover covers the top of the CT scanning rotating sample platform on the CT scanning system, the bottom of which is fixed by a resilient support bracket, and the top is sealed and connected to the bottom of the three-axis loading cylinder through a sealing rubber ring;

[0009] The water storage tank surrounds the top of the CT scanning rotating sample platform and is used to collect water leaked from the three-axis loading cylinder;

[0010] Monitoring and alarm mechanisms, including water storage tanks and water level measurement alarms;

[0011] The float of the water level measurement alarm is located in the water tank, and as the water level rises, it triggers the conductive sheet to contact the metal conductor block, thereby activating the sound and light alarm.

[0012] Furthermore, it also includes a sample, which is wrapped in a silicone protective cover and a multi-layer elastic film is formed by a glue-coating gradient protection method to prevent sharp fractures from piercing the silicone protective cover when the sample is damaged.

[0013] Furthermore, the glue-coating gradient protection method is specifically as follows: high-elastic silicone glue is used to apply longitudinally and spirally between the silicone protective cover and the sample to form a uniform protective layer to block the leakage path of the confining pressure water.

[0014] Furthermore, a developer is sprayed on the multi-layer elastic film.

[0015] Furthermore, the glue-coated gradient protection method includes the following steps:

[0016] Step 1: After placing the sample into the silicone protective cover and fixing it between the upper and lower pressure heads, clean the surface of the silicone protective cover that wraps the sample;

[0017] Step 2: Take high-elastic silicone glue and place it on the surface of the silicone protective cover. Based on the axial direction of the sample, apply it at a uniform speed in the longitudinal direction to form an initial coating. After completion, rotate the sample horizontally 120° and repeat the coating. Adjust the sample orientation after each coating. Use three overlapping operations at different angles to eliminate uncovered areas and form a uniform first layer of adhesive film.

[0018] Step 3: After the first layer of adhesive film has dried, apply a second layer of adhesive in a spiral pattern to increase overall thickness and bonding strength.

[0019] Step 4: After the adhesive layer is completely formed and fully cured, place the sample into the carbon fiber tank.

[0020] Furthermore, it also includes a carbon fiber pressure tank, which includes a tank body, an upper pressure head and a lower pressure head. The sample and the silicone protective cover are fixed between the upper pressure head and the lower pressure head and then installed in the tank body as a whole. The tank body is subjected to axial pressure and confining pressure by a triaxial loading cylinder, and the center hole of the lower pressure head is facing the triaxial loading cylinder.

[0021] The three-axis loading cylinder is fixed on the CT scanning system, and the CT scanning system is used to synchronize multi-angle CT scanning and mechanical loading.

[0022] Furthermore, the CT scanning system includes an electric servo slide and a CT scanning rotating sample holder on the electric servo slide. The three-axis loading cylinder is fixed on the CT scanning rotating sample holder. The electric servo slide controls the sample position to achieve synchronization of multi-angle CT scanning and mechanical loading.

[0023] Furthermore, the bottom protrusion of the three-axis loading cylinder is inserted into the adjustable jaws at the top of the CT scanning rotating sample holder, and an external pressure source is input through the top hole of the three-axis loading cylinder. The pressure source is water pressure for providing axial pressure.

[0024] Furthermore, the waterproof cover top includes a waterproof disc, a resilient support frame and an anti-slip mat;

[0025] The bottom end of the resilient support leg is provided with an anti-skid pad, and the top sealing rubber ring is tightly fitted with the bottom of the three-axis loading cylinder.

[0026] Furthermore, the water level measurement alarm includes a tube shell, a float, a metal conductor block, a waterproof shell, a conductive sheet, and an audible and visual alarm; the tube shell is connected to the inner wall of the water tank and does not contact the bottom of the water tank; the float is inside the tube shell, the waterproof shell is fixed to the top of the outer edge of the water tank, and the bottom opening of the waterproof shell is connected to the tube shell orifice; the metal conductor block is fixed to the top of the float, and the conductive sheet is fixed to the bottom end of the waterproof shell and vertically suspended above the top of the float; the audible and visual alarm is inside the waterproof shell and is respectively connected to the metal conductor block and the conductive sheet through wires;

[0027] When in use, the water tank is wrapped around the top of the CT scanning rotating sample holding platform, and the groove at the bottom of the water tank is aligned with the control knob of the adjustable jaws, the waterproof cover is on the top of the CT scanning rotating sample holding platform, and the three-axis loading cylinder is on the top of the waterproof cover.

[0028] Beneficial effects: Dynamic waterproofing and leakage protection of the present invention: a physical isolation layer is formed by the waterproof cover top and the sealing rubber ring to prevent the confined pressure water from directly penetrating into the CT scanning system, avoiding equipment corrosion and experiment interruption; real-time monitoring and active alarm: the water storage tank collects leaked water, and the water level measurement alarm triggers the sound and light alarm through the float and conductive sheet to achieve immediate response to the leak and ensure experimental safety; structural compatibility: the rebound support tripod can adapt to the dynamic displacement of the three-axis loading cylinder and the CT equipment to ensure sealing stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the structure of the use state of the dynamic safety monitoring and protection device for CT real-time triaxial experiments according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the protection mechanism structure of the dynamic safety monitoring and protection device for CT real-time triaxial experiments according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of a monitoring and alarm mechanism for a dynamic safety monitoring and protection device for a CT real-time triaxial experiment according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of a water level measurement alarm for a dynamic safety monitoring and protection device for a CT real-time triaxial experiment according to an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the assembly of a carbon fiber pressure cylinder and a triaxial loading cylinder for a dynamic safety monitoring and protection device for a CT real-time triaxial experiment according to an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of a carbon fiber pressure tank loaded with a sample for the dynamic safety monitoring and protection device for CT real-time triaxial experiments according to an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the assembly structure of a sample and a silicone sleeve for a dynamic safety monitoring and protection device for a CT real-time triaxial experiment according to an embodiment of the present invention;

[0037] Figure 8 This is a monitoring and alarm flow chart of the dynamic safety monitoring and protection device for CT real-time triaxial experiments according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] Example 1

[0041] See also Figure 1-8 : A dynamic safety monitoring and protection device for CT real-time triaxial experiments, comprising: a protection mechanism 3 consisting of a waterproof cover top 301 and a sealing rubber ring 302;

[0042] The waterproof cover 301 covers the top of the CT scanning rotating sample holding platform 102 on the CT scanning system 1, and its bottom is fixed by a resilient support bracket 3012, and its top is sealed and connected to the bottom end of the three-axis loading cylinder 2 through a sealing rubber ring 302;

[0043] The water storage tank 401 surrounds the top of the CT scanning rotating sample platform 102 and is used to collect water leaked from the three-axis loading cylinder 2;

[0044] Monitoring and alarm mechanism 4, including water storage tank 401 and water level measurement alarm 402;

[0045] The float 4022 of the water level measurement alarm 402 is located in the water tank 401 . As the water level rises, the conductive sheet 4024 is triggered to contact the metal conductor block 4026 , thereby activating the sound and light alarm 4025 .

[0046] This embodiment achieves dynamic waterproofing and leakage protection: the waterproof cover and the sealing rubber ring form a physical isolation layer to prevent the confining pressure water from directly penetrating into the CT scanning system, thus avoiding equipment corrosion and experiment interruption;

[0047] Real-time monitoring and active alarm: The water storage tank collects leaked water, and the water level measurement alarm triggers an audible and visual alarm through a float and a conductive sheet, achieving immediate response to leaks and ensuring experimental safety;

[0048] Structural compatibility: The rebound support bracket adapts to the dynamic displacement of the triaxial loading cylinder and CT equipment to ensure sealing stability.

[0049] In a specific example, a sample 6 is also included, which is wrapped in a silicone protective cover 7 and a multi-layer elastic film is formed by a glue-coating gradient protection method to prevent sharp fractures of the sample 6 from piercing the silicone protective cover 7 when the sample 6 is damaged.

[0050] This embodiment achieves gradient protection enhancement: the silicone protective cover is combined with a gluing method to form a multi-layer elastic film, which effectively prevents sharp fractures from piercing the protective cover when the sample is damaged, thereby blocking the leakage path of the confining pressure water;

[0051] Improved specimen protection and sealing: The wrap-around design reduces the risk of accidental damage to the specimen due to stress concentration, while enhancing the sealing of the experimental environment.

[0052] In a specific example, the glue-coated gradient protection method is specifically as follows: high-elastic silicone glue is longitudinally and spirally coated between the silicone protective cover 7 and the sample 6 to form a uniform protective layer to block the leakage path of the confined pressure water.

[0053] This embodiment optimizes the coating process: the longitudinal + spiral coating method eliminates the blind area of the coating, forms a uniform adhesive film, and significantly improves the puncture resistance of the protective layer; the leakage path is blocked: the superposition of multiple layers of adhesive film can cover the microscopic defects on the surface of the sample and reduce the possibility of confining pressure water penetration.

[0054] In a specific example, a developer is sprayed on the multi-layer elastic film.

[0055] The multi-layer elastic film of this embodiment can protect the rubber sleeve from being damaged and does not affect the CT scanning effect. The CT imaging contrast can be enhanced by spraying a developer (barium sulfate coating).

[0056] In a specific example, the glue-coated gradient protection method includes the following steps:

[0057] Step 1: After placing the sample 6 into the silicone protective cover 7 and fixing it between the upper pressure head 502 and the lower pressure head 503, clean the surface of the silicone protective cover 7 covering the sample;

[0058] Step 2: Take high-elastic silicone glue and place it on the surface of the silicone protective cover 7. With the axial direction of the sample 6 as the reference, apply it at a uniform speed in the longitudinal direction to form an initial coating. After completion, rotate the sample horizontally 120° and repeat the coating. Adjust the sample orientation after each coating. Eliminate the uncovered area by three overlapping operations at different angles to form a uniform first layer of adhesive film.

[0059] It should be noted that the main component of high-elastic silicone glue is silicone, which is soft and not hard, waterproof and highly elastic, and can be bonded with silicone materials. The glue can also be replaced by other materials with the same properties.

[0060] Step 3: After the first layer of adhesive film has dried, apply a second layer of adhesive in a spiral pattern to increase overall thickness and bonding strength.

[0061] Step 4: After the adhesive layer is completely formed and fully cured, the sample 6 is placed into the carbon fiber can 501.

[0062] The standardized operating process of this embodiment: a step-by-step glue coating process (axial reference → rotational superposition → spiral reinforcement) ensures coating uniformity and controllability, avoiding human errors; the adhesive film has high bonding strength: three coatings at different angles enhance the adhesion between the adhesive layer and the sample surface, and a high-strength sealing barrier is formed after curing.

[0063] It should be noted that in the later stages of the CT real-time triaxial test, the specimen will experience significant damage. The silicone sleeve used to secure the specimen has high tensile strength but insufficient elasticity. After the specimen reaches peak strength, the resulting sharp fracture easily pierces the silicone sleeve, causing confining water to flow through the specimen cracks, enter the loading cylinder through the center hole of the lower pressure head, and overflow through the hole in the cylinder top, forcing the experiment to be terminated for maintenance. In addition to the fixation and protection provided by the original silicone sleeve, a high-elastic silicone glue is applied to the outer layer to form a second line of defense. This method combines two advantages: the high-elastic silicone glue has excellent flexibility and a high elongation at break of 400%, which not only solves the problem of specimen fixation during the experimental loading process, but also compensates for the silicone sleeve's lack of elasticity. Its excellent adhesion also facilitates handling. When the sharp fracture of the specimen pierces the silicone sleeve, the outer layer of glue forms an impenetrable barrier, effectively preventing the intrusion of confining water. During the implementation process, the gradient configuration of material properties was used to maintain the specimen positioning accuracy and achieve dynamic protection. Ultimately, the data reliability was guaranteed while maintaining the continuity of the experiment, providing a reliable composite protection paradigm for similar triaxial mechanical experiments.

[0064] In a specific example, a carbon fiber pressure tank 5 is further included. The carbon fiber pressure tank 5 includes a tank body 501, an upper pressure head 502, and a lower pressure head 503. The sample 6 and the silicone protective cover 7 are fixed between the upper pressure head 502 and the lower pressure head 503 and then installed in the tank body 501. The tank body 501 is subjected to axial pressure and confining pressure by the triaxial loading cylinder 2. The center hole 504 of the lower pressure head 503 faces the triaxial loading cylinder 2.

[0065] The three-axis loading cylinder 2 is fixed on the CT scanning system 1 , and the CT scanning system 1 is used to synchronize multi-angle CT scanning and mechanical loading.

[0066] This embodiment is adaptable to high-pressure environments: the carbon fiber pressure tank is lightweight and has high compressive strength, and can withstand the axial pressure and confining pressure applied by the triaxial loading cylinder;

[0067] Synchronization of experiment and scanning: After the sample and the silicone protective cover are integrally placed in the tank, the CT scanning system is used to achieve real-time synchronous observation of mechanical loading and structural evolution.

[0068] In a specific example, the CT scanning system 1 includes an electric servo slide 101 and a CT scanning rotating sample platform 102 on the electric servo slide 101. The three-axis loading cylinder 2 is fixed on the CT scanning rotating sample platform 102. The electric servo slide 101 controls the position of the sample 6 to achieve synchronization of multi-angle CT scanning and mechanical loading.

[0069] This embodiment achieves high-precision dynamic control: the electric servo slide accurately adjusts the sample position, ensuring the synchronization of multi-angle CT scanning and the loading process, improving data accuracy; the equipment is highly integrated: the three-axis loading cylinder is directly fixed to the CT scanning rotating sample holder, simplifying the experimental setup and reducing external interference.

[0070] In a specific example, the bottom protrusion 201 of the three-axis loading cylinder 2 is inserted into the adjustable jaw 1022 at the top of the CT scanning rotating sample holder 102, and an external pressure source is input through the top hole 202 of the three-axis loading cylinder 2. The pressure source is water pressure or air pressure for providing axial pressure.

[0071] This embodiment achieves pressure transmission stability: the protrusion at the bottom end of the three-axis loading cylinder is inserted into the adjustable jaws, and an external pressure source, such as water pressure / air pressure, is input through the top hole 202 of the three-axis loading cylinder 2 to provide axial pressure, thereby avoiding stress fluctuations caused by mechanical contact; compatibility design: the adjustable jaws are adapted to loading cylinders of different sizes, enhancing experimental flexibility.

[0072] In a specific example, the waterproof cover top 301 includes a waterproof disc 3011, a resilient support frame 3012 and an anti-slip pad 3013;

[0073] The bottom end of the resilient support leg 3012 is provided with an anti-skid pad 3013 , and the top sealing rubber ring 302 is tightly fitted with the bottom of the three-axis loading cylinder 2 .

[0074] This embodiment provides dual sealing protection: the waterproof disc is combined with the anti-slip pad to prevent the waterproof cover from shifting, ensuring a tight fit with the three-axis loading cylinder; the anti-vibration design: the rebound support legs absorb vibrations during the experiment and maintain the long-term stability of the sealing rubber ring.

[0075] In a specific example, the water level measurement alarm 402 includes a tube shell 4021, a float 4022, a metal conductor block 4026, a waterproof shell 4023, a conductive sheet 4024, and an audible and visual alarm 4025; the tube shell 4021 is connected to the inner wall of the water storage tank 401 and does not contact the bottom of the water storage tank 401, the float 4022 is inside the tube shell 4021, the waterproof shell 4023 is fixed to the top of the outer edge of the water storage tank 401, and the bottom opening of the waterproof shell 4023 is connected to the pipe mouth of the tube shell 4021, the metal conductor block 4026 is fixed to the top of the float 4022, the conductive sheet 4024 is fixed to the bottom end of the waterproof shell 4023 and vertically suspended from the top of the float 4022; the audible and visual alarm 4025 is inside the waterproof shell 4023 and is respectively connected to the metal conductor block 4026 and the conductive sheet 4024 through wires;

[0076] When in use, the water tank 401 is wrapped around the top of the CT scanning rotating sample holder 102, and the groove 4011 at the bottom of the water tank is aligned with the control knob 1021 of the adjustable jaw 1022, the waterproof cover top 301 is at the top of the CT scanning rotating sample holder 102, and the three-axis loading cylinder 2 is at the top of the waterproof cover top 301.

[0077] The reliable trigger mechanism of this embodiment: the float pushes the metal conductor block to contact the conductive sheet as the water level rises, triggering the sound and light alarm to avoid false alarms or missed alarms;

[0078] Waterproof and compact design: The waterproof shell protects the internal circuit, and the tube shell and water tank are connected non-contactly, which is convenient for maintenance without interfering with experimental operations.

[0079] It should be noted that the dynamic safety monitoring and protection device for CT real-time triaxial experiments of this embodiment needs to perform the following adjustments during the test:

[0080] S1. Adjust the jaws 1022 to the minimum by rotating the jaw control knob 1021;

[0081] S2. Insert the monitoring alarm mechanism 4 into the CT scanning rotating sample holder 102, and align the groove 4011 at the bottom of the water storage tank with the jaw control knob 1021;

[0082] S3. Rotate the jaw control knob 1021 to adjust the jaw 1021 to a size that can be inserted into the bottom protrusion 201 of the three-axis loading cylinder;

[0083] S4. Place the protection mechanism 3 on the CT scanning rotation 102, and position the rebound support leg 3012 so that it is offset from the clamp 1023;

[0084] S5. Place the three-axis loading cylinder 2 on the top of the waterproof cover 301 so that the bottom of the three-axis loading cylinder fits in with the sealing rubber ring 302;

[0085] S6. Insert the protrusion 201 at the bottom of the three-axis loading cylinder into the jaws 1022, rotate the jaw control knob 1021 to clamp the three-axis loading cylinder 2, and after fixing the three-axis loading cylinder 2, carry out subsequent operations of the experiment.

[0086] In summary, this embodiment has the following comprehensive technical advantages:

[0087] Comprehensive technical advantages

[0088] Full-process protection: from sample protection (silicone sleeve + glue coating) → dynamic sealing (waterproof cover) → leakage monitoring (water storage tank + alarm), forming a closed-loop safety system.

[0089] High Precision and Compatibility: The carbon fiber pressure tank, electric servo slide, and adjustable jaws work together to adapt to complex experimental requirements, ensuring synchronization between CT scanning and mechanical loading and data reliability.

[0090] Low-cost maintenance: Modular design (such as replaceable silicone sleeves and waterproof cover) reduces maintenance difficulty and extends the service life of the equipment.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dynamic safety monitoring and protection device for CT real-time triaxial experiments, characterized in that: include: The protection mechanism (3) is composed of a waterproof cover top (301) and a sealing rubber ring (302); The waterproof cover top (301) covers the top of the CT scanning rotating sample platform (102) on the CT scanning system (1), the bottom of which is fixed by a resilient support leg (3012), and the top is sealedly connected to the bottom end of the three-axis loading cylinder (2) via a sealing rubber ring (302); The water storage tank (401) surrounds the top of the CT scanning rotating sample platform (102) and is used to collect water leaked from the three-axis loading cylinder (2); A monitoring and alarm mechanism (4), comprising a water storage tank (401) and a water level measurement alarm (402); The float (4022) of the water level measurement alarm (402) is located in the water storage tank (401), and as the water level rises, the conductive sheet (4024) is triggered to contact the metal conductor block (4026), thereby activating the sound and light alarm (4025).

2. The dynamic safety monitoring and protection device for CT real-time triaxial experiment according to claim 1 is characterized in that: The invention also includes a sample (6), which is wrapped in a silicone protective cover (7) and forms a multi-layer elastic film through a glue-coating gradient protection method to prevent the sharp fracture of the sample (6) from piercing the silicone protective cover (7) when it is damaged.

3. The dynamic safety monitoring and protection device for CT real-time triaxial experiment according to claim 2 is characterized in that: The specific method of the glue-coating gradient protection is as follows: high-elastic silicone glue is applied longitudinally and spirally between the silicone protective cover (7) and the sample (6) to form a uniform protective layer and block the leakage path of the confined pressure water.

4. The dynamic safety monitoring and protection device for CT real-time triaxial experiment according to claim 3 is characterized in that: A developer is also sprayed on the multi-layer elastic film.

5. The dynamic safety monitoring and protection device for CT real-time triaxial experiment according to claim 3 is characterized in that: The glue-coated gradient protection method comprises the following steps: Step 1: After the sample (6) is placed in the silicone protective cover (7) and fixed between the upper pressure head (502) and the lower pressure head (503), the surface of the silicone protective cover (7) covering the sample is cleaned; Step 2: Take high-elastic silicone glue and place it on the surface of the silicone protective cover (7). With the axial direction of the sample (6) as the reference, apply it at a uniform speed in the longitudinal direction to form an initial coating. After completion, rotate the sample horizontally 120 degrees and repeat the application. Adjust the sample orientation synchronously after each application. Eliminate the uncovered area through three overlapping operations at different angles to form a uniform first layer of adhesive film. Step 3: After the first layer of adhesive film has dried, apply a second layer of adhesive in a spiral pattern to increase overall thickness and bonding strength. Step 4: After the adhesive layer is completely formed and fully cured, the sample (6) is placed into the carbon fiber can (501).

6. The dynamic safety monitoring and protection device for CT real-time triaxial experiment according to claim 2 is characterized in that: The carbon fiber pressure tank (5) includes a tank body (501), an upper pressure head (502), and a lower pressure head (503). The sample (6) and the silicone protective cover (7) are fixed between the upper pressure head (502) and the lower pressure head (503) and then the whole is loaded into the tank body (501). The tank body (501) is subjected to axial pressure and confining pressure through the three-axis loading cylinder (2). The center hole (504) of the lower pressure head (503) faces the three-axis loading cylinder (2). The three-axis loading cylinder (2) is fixed on the CT scanning system (1), and the CT scanning system (1) is used to synchronize multi-angle CT scanning and mechanical loading.

7. The dynamic safety monitoring and protection device for CT real-time triaxial experiment according to claim 6 is characterized in that: The CT scanning system (1) comprises an electric servo slide (101) and a CT scanning rotating sample holder (102) on the electric servo slide (101); the three-axis loading cylinder (2) is fixed on the CT scanning rotating sample holder (102); the electric servo slide (101) controls the position of the sample (6), and realizes synchronization of multi-angle CT scanning and mechanical loading.

8. The dynamic safety monitoring and protection device for CT real-time triaxial experiment according to claim 7 is characterized in that: The bottom protrusion (201) of the three-axis loading cylinder (2) is inserted into the adjustable jaw (1022) at the top of the CT scanning rotating sample support (102), and an external pressure source is input through the top hole (202) of the three-axis loading cylinder (2), and the pressure source is water pressure for providing axial pressure.

9. The dynamic safety monitoring and protection device for CT real-time triaxial experiment according to claim 1 is characterized in that: The waterproof cover top (301) comprises a waterproof disc (3011), a resilient support frame (3012) and an anti-slip pad (3013); The bottom end of the resilient support leg (3012) is provided with an anti-skid pad (3013), and the top sealing rubber ring (302) is tightly fitted with the bottom of the three-axis loading cylinder (2).

10. The dynamic safety monitoring and protection device for CT real-time triaxial experiment according to claim 1 is characterized in that: The water level measurement alarm (402) comprises a tube shell (4021), a float (4022), a metal conductor block (4026), a waterproof shell (4023), a conductive sheet (4024), and an audible and visual alarm (4025); the tube shell (4021) is connected to the inner wall of the water storage tank (401) and does not contact the bottom of the water storage tank (401); the float (4022) is inside the tube shell (4021); and the waterproof shell (4023) is fixed to the outer edge of the water storage tank (401). The top of the float (4022) is connected to the top of the tube shell (4021), and the bottom opening of the waterproof shell (4023) is connected to the tube mouth of the tube shell (4021); the metal conductor block (4026) is fixed to the top of the float (4022); the conductive sheet (4024) is fixed to the bottom end inside the waterproof shell (4023) and vertically suspended above the top of the float (4022); the sound and light alarm (4025) is inside the waterproof shell (4023) and is respectively connected to the metal conductor block (4026) and the conductive sheet (4024) through wires; In use, the water storage tank (401) is wrapped around the top of the CT scanning rotating sample holding platform (102), and the groove (4011) at the bottom of the water storage tank is aligned with the control knob (1021) of the adjustable jaw (1022), the waterproof cover top (301) is at the top of the CT scanning rotating sample holding platform (102), and the three-axis loading cylinder (2) is at the top of the waterproof cover top (301).

Images