Shale triaxial test monitoring and early warning system and method fused with three-dimensional CT scanning

Abstract

The invention discloses a shale triaxial test monitoring and early warning system and method fused with three-dimensional CT scanning, the system comprises a three-dimensional CT scanning device, a triaxial test device, a data analysis device and an intelligent monitoring device which are connected in sequence, and the three-dimensional CT scanning device obtains shale three-dimensional structure feature information; the triaxial test device obtains stress, strain and crack information in the whole shale triaxial test process; the data analysis device acquires stress strain, internal microstructure parameters and crack change conditions of the shale in real time, and calculates peak stress and peak strain of the shale according to internal structure characteristics acquired by the three-dimensional CT scanning device; the intelligent monitoring device is used for receiving data transmitted by the data analysis device and carrying out real-time monitoring on stress, strain, cracks and microstructures of the whole-process triaxial test. Through the synergistic effect of the devices, the whole-process monitoring of the shale triaxial test is realized, important technical support is provided for engineering safety, the potential risk is reduced, and the life and property safety of personnel is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of shale triaxial test monitoring and early warning, and in particular relates to a shale triaxial test monitoring and early warning system and method integrated with three-dimensional CT scanning. Background Art

[0002] The mechanical properties of shale directly affect its stability and safety in engineering applications. Although traditional triaxial testing methods can test the compressive strength and strain characteristics of shale, they can usually only obtain limited macroscopic mechanical behavior data. For microstructural changes, such as crack development and pore changes, traditional methods are often difficult to directly observe and analyze.

[0003] In recent years, with the continuous development of CT technology, it has gradually been applied to shale research. CT technology's advantage lies in its ability to non-destructively obtain three-dimensional images of the shale interior, revealing the shale's microstructure. This allows researchers to monitor and analyze microscopic changes during triaxial testing, thereby better understanding the material's behavior under complex stress states.

[0004] Existing monitoring systems often rely solely on single sensor data and lack a comprehensive monitoring solution, making it impossible to effectively predict material failure.

[0005] Therefore, there is an urgent need to invent a shale mechanics monitoring technology to solve the problems in current technology, such as high monitoring cost, unstable detection frequency and narrow coverage during shale triaxial testing, as well as poor analysis ability during monitoring due to incomplete shale information. Summary of the Invention

[0006] The problem to be solved by the present invention is to provide a shale triaxial test monitoring and early warning system and method integrated with three-dimensional CT scanning. The system can not only provide real-time three-dimensional imaging data, but also combine stress, strain and other data for monitoring, which helps to identify potential structural problems in advance, thereby improving safety.

[0007] To solve the above technical problems, the present invention adopts a technical solution: a shale triaxial test monitoring and early warning system integrated with three-dimensional CT scanning, comprising a three-dimensional CT scanning device, a triaxial test device, a data analysis device and an intelligent monitoring device connected in sequence.

[0008] The three-dimensional CT scanning device obtains three-dimensional structural characteristic information of shale and information on changes in shale structural characteristics during the triaxial test process;

[0009] The triaxial test device obtains stress, strain and crack information of the shale triaxial test in the whole process;

[0010] The data analysis device acquires the stress and strain, internal microstructure parameters and crack changes of the shale in real time, and calculates the peak stress and peak strain of the shale based on the internal structural characteristics acquired by the three-dimensional CT scanning device;

[0011] The intelligent monitoring device receives the data transmitted by the data analysis device and performs real-time monitoring of the stress, strain, cracks and microstructure of the whole triaxial test.

[0012] Furthermore, the three-dimensional CT scanning device includes a sample placement table, the bottom of the sample placement table is connected to the top of the transmission ring, the bottom of the transmission ring is connected to the three-dimensional laser scanner, and a transmission switch is provided on the transmission ring, which controls the unobstructed or blocked state of the transmission ring.

[0013] Furthermore, the triaxial testing device includes an outer shell, which is a square frame. A base is provided at the bottom of the outer shell, and a pressure chamber is provided above the base. One end of the pressure chamber is connected to a hydraulic loading pump through a transmission pipe, and the other end of the pressure chamber is connected to a confining pressure loading pump through a transmission pipe. A pressure ball is provided above the pressure chamber, and the pressure ball is connected to a loading control device. The loading control device controls the exact position of the pressure ball, and the loading control device is placed on the top of the outer shell.

[0014] Furthermore, the loading control device includes a main frame, which is in the shape of a long frame. A protective cover is provided on the outside of the main frame, and an axial push rod and a radial push rod are vertically provided inside the main frame. A positioning ball is provided at the intersection of the axial push rod and the radial push rod. The axial push rod is controlled by an axial control button, the radial push rod is controlled by a radial control button, and the positioning ball is controlled jointly by the axial control button and the radial control button.

[0015] Furthermore, the data analysis device includes a structural feature analysis module, a stress analysis module and a strain analysis module. The structural feature analysis module receives structural feature information of the shale after being scanned by the three-dimensional CT scanning device, the stress analysis module receives stress information after the triaxial testing device acts, and the strain analysis module receives strain information after the triaxial testing device acts. The stress analysis module calculates the peak stress of the shale based on the shale structural feature information obtained by the structural feature analysis module, and the strain analysis module calculates the peak strain of the shale based on the shale structural feature information obtained by the structural feature analysis module.

[0016] Furthermore, the triaxial testing device and the data analysis device are connected via a first connecting rod, and the data analysis device and the intelligent monitoring device are connected via a second connecting rod.

[0017] Furthermore, the connecting rod includes an insulating shell, which is in the shape of a circular column. Connecting elements are provided at both ends of the insulating shell, and adjusting nuts are provided inside the connecting elements. The conductive optical fiber is wound around the outside of the insulating shell.

[0018] Furthermore, the present invention also provides a shale triaxial test monitoring and early warning method integrated with three-dimensional CT scanning, which utilizes the above-mentioned shale triaxial test monitoring and early warning system integrated with three-dimensional CT scanning, including the following steps:

[0019] S1: The sample is placed on the sample placement table, and the 3D laser scanner scans the sample to obtain the structural and pore structure parameter information of the shale;

[0020] S2: Adjust the transmission switch to transmit the sample to the triaxial test device through the transmission ring to perform shale triaxial testing and obtain shale mechanical parameters;

[0021] S3: The data analysis device obtains the changes in shale structural characteristics and rock mechanical parameters during the entire triaxial test process;

[0022] S4: The data analysis device monitors the changes in mechanical data during the shale triaxial test and transmits the signals to the intelligent monitoring device for real-time monitoring.

[0023] Furthermore, in S3, the data analysis device includes a structural feature analysis module, a stress analysis module and a strain analysis module. The structural feature analysis module obtains changes in shale structural features during the entire triaxial test process. The stress analysis module and the strain analysis module obtain changes in shale mechanical parameters during the entire triaxial test process. The data analysis device obtains the peak stress and peak strain of the shale in real time.

[0024] Furthermore, in S4, when the shale reaches peak stress and peak strain, the data analysis device transmits a signal to the intelligent monitoring device, issuing an early warning signal.

[0025] The advantages and positive effects of the present invention are:

[0026] This method uses a 3D CT scanner to obtain structural characteristic parameters of shale, a triaxial testing device to obtain mechanical parameters of shale, a data analysis device to analyze peak stress and peak strain of shale, and an intelligent monitoring device to monitor changes in shale fractures, mechanical parameters, and microstructure, thereby providing comprehensive monitoring of the shale triaxial testing process. Through the synergistic effect of these devices, this method can achieve full monitoring of the shale triaxial testing process, providing important technical support for engineering safety, helping to reduce potential risks and protect personnel and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a schematic diagram of the overall structure of an embodiment of the device of the present invention.

[0028] Figure 2 It is a schematic structural diagram of a loading control device according to an embodiment of the present invention.

[0029] Figure 3 Schematic diagram of the connecting rod structure of an embodiment of the device of the present invention.

[0030] Figure 4 It is an overall flow chart of an embodiment of the method of the present invention.

[0031] In the picture:

[0032] 1. 3D CT scanning device; 11. Sample placement table; 12. Transmission switch; 13. Transmission ring; 14. 3D laser scanner;

[0033] 2. Triaxial test apparatus; 21. Base; 22. Housing; 23. Transmission pipe; 24. Hydraulic loading pump; 25. Confining pressure loading pump; 26. Pressure ball; 27. Pressure chamber; 28. Loading control device; 281. Axial control button; 282. Radial control button; 283. Axial push rod; 284. Radial push rod; 285. Main frame; 286. Protective cover; 287. Positioning ball;

[0034] 3. Connecting rod; 31. Connecting element; 32. Adjusting nut; 33. Insulating housing; 34. Conducting optical fiber;

[0035] 4. Data analysis device; 41. Structural feature analysis module; 42. Stress analysis module; 43. Strain analysis module; 44. Power supply;

[0036] 5. Intelligent monitoring device. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0040] The embodiments of the present invention are further described below with reference to the accompanying drawings:

[0041] like Figure 1 As shown, a shale triaxial test monitoring and early warning system integrated with three-dimensional CT scanning includes a three-dimensional CT scanning device 1, a triaxial test device 2, a data analysis device 4 and an intelligent monitoring device 5 connected in sequence.

[0042] The three-dimensional CT scanning device 1 obtains the three-dimensional structural characteristic information of shale and the information on the change of the shale structural characteristics during the triaxial test. The three-dimensional CT scanning device 1 is any structure that realizes the above functions. Specifically, the three-dimensional CT scanning device 1 provided in this embodiment includes a sample placement table 11, the bottom of the sample placement table 11 is connected to the top of the transmission ring 13, the bottom of the transmission ring 13 is connected to the three-dimensional laser scanner 14, and the transmission ring 13 is provided with a transmission switch 12. The transmission switch 12 controls the smoothness or blockage of the transmission ring 13. When in use, the transmission switch 12 is closed, the sample is placed on the sample placement table 11, and the three-dimensional laser scanner 14 scans and processes the sample. After the scanning is completed, the transmission switch 12 is turned on, and the sample is transmitted along the transmission ring 13 to the triaxial test device 2.

[0043] The triaxial testing device 2 obtains stress, strain, and crack information throughout the entire triaxial testing process of shale. The triaxial testing device 2 is any structure that achieves the above-mentioned functions. Specifically, the triaxial testing device 2 provided in this embodiment includes a housing 22, which is a square frame. A base 21 is provided at the bottom of the housing 22, and a pressure chamber 27 is provided above the base 21. One end of the pressure chamber 27 is connected to a hydraulic loading pump 24 via a transmission pipe 23, and the other end of the pressure chamber 27 is connected to a confining pressure loading pump 25 via a transmission pipe 23. A pressure ball 26 is provided above the pressure chamber 27, and the pressure ball 26 is connected to a loading control device 28. The loading control device 28 controls the exact position of the pressure ball 26, and the loading control device 28 is placed on the top of the housing 22. During use, the hydraulic loading pump 24 transmits hydraulic pressure to the pressure chamber 27 via the transmission pipe 23, and the confining pressure loading pump 25 transmits confining pressure to the pressure chamber 27 via the transmission pipe 23. The loading control device 28 controls the position of the pressure ball 26, causing the shale sample to deform and completing the triaxial testing process.

[0044] like Figure 2 As shown, the loading control device 28 includes a main frame 285, which is in the shape of an elongated frame. A protective cover 286 is provided on the outside of the main frame 285. An axial push rod 283 and a radial push rod 284 are vertically provided inside the main frame 285. A positioning ball 287 is provided at the intersection of the axial push rod 283 and the radial push rod 284. The axial push rod 283 is controlled by an axial control button 281, and the radial push rod 284 is controlled by a radial control button 282. The positioning ball 287 is controlled by both the axial control button 281 and the radial control button 282. During operation, the axial control button 281 drives the axial push rod 283 to move longitudinally along the main frame 285, and the radial control button 282 drives the radial push rod 284 to move laterally along the main frame 285. The two control the position of the positioning ball 287 together, achieving precise adjustment of the test process and providing accurate data support for subsequent data analysis.

[0045] Data analysis device 4 acquires the stress and strain, internal microstructural parameters, and crack changes of the shale in real time, and calculates the peak stress and peak strain of the shale based on the internal structural characteristics acquired by the 3D CT scanning device 1. Data analysis device 4 is any structure that implements the aforementioned functions. Specifically, the data analysis device 4 provided in this embodiment includes a structural characteristic analysis module 41, a stress analysis module 42, a strain analysis module 43, and a power supply 44. Structural characteristic analysis module 41 receives structural characteristic information of the shale after being scanned by the 3D CT scanning device 1, stress analysis module 42 receives stress information after the triaxial test device 2 acts, and strain analysis module 43 receives strain information after the triaxial test device 2 acts. Stress analysis module 42 calculates the peak stress of the shale based on the structural characteristic information of the shale acquired by structural characteristic analysis module 41, and strain analysis module 43 calculates the peak strain of the shale based on the structural characteristic information of the shale acquired by structural characteristic analysis module 41. Power supply 44 supplies power to structural characteristic analysis module 41, stress analysis module 42, and strain analysis module 43.

[0046] The intelligent monitoring device 5 receives data from the data analysis device 4 and performs real-time monitoring of stress, strain, cracks, and microstructure throughout the triaxial test. It visualizes crack changes and mechanical data during the test. The test is terminated when the shale stress and strain exceed the peak stress and strain information, ensuring full monitoring of the entire test process.

[0047] Preferably, Figure 1 As shown, the triaxial test device 2 and the data analysis device 4 are connected via a first connecting rod 3, and the data analysis device 4 and the intelligent monitoring device 5 are connected via a second connecting rod 3. Figure 3 As shown, the connecting rod 3 includes an insulating shell 33, which is a circular cylindrical body. Connecting elements 31 are provided at both ends of the insulating shell 33, and an adjusting nut 32 is provided inside the connecting element 31. A conducting optical fiber 34 is wound around the outside of the insulating shell 33.

[0048] like Figure 4 As shown, the present invention also provides a shale triaxial test monitoring and early warning method integrated with three-dimensional CT scanning, which utilizes the above-mentioned shale triaxial test monitoring and early warning system integrated with three-dimensional CT scanning, including the following steps:

[0049] S1: The sample is placed on the sample placement table 11, and the three-dimensional laser scanner 14 scans the sample to obtain the structural and pore structure parameter information of the shale.

[0050] S2: Adjust the transmission switch 12 to transmit the sample to the triaxial testing device 2 through the transmission ring 13 to perform a shale triaxial test and obtain shale mechanical parameters.

[0051] S3: Data analysis device 4 obtains changes in shale structural characteristics and rock mechanical parameters throughout the triaxial test. Specifically, structural characteristic analysis module 41 obtains changes in shale structural characteristics throughout the triaxial test. Stress analysis module 42 and strain analysis module 43 obtain changes in shale mechanical parameters throughout the triaxial test. Data analysis device 4 obtains the peak stress and peak strain of the shale in real time.

[0052] S4: The data analysis device 4 monitors changes in mechanical data during the shale triaxial test and transmits the signals to the intelligent monitoring device 5 for real-time monitoring. Specifically, when peak stress and peak strain are reached, the signals are transmitted to the intelligent monitoring device 5 via the transmission optical fiber 34, generating a warning signal.

[0053] The advantages and positive effects of the present invention are:

[0054] This method uses a 3D CT scanner to obtain structural characteristic parameters of shale, a triaxial testing device to obtain mechanical parameters of shale, a data analysis device to analyze peak stress and peak strain of shale, and an intelligent monitoring device to monitor changes in shale fractures, mechanical parameters, and microstructure, thereby providing comprehensive monitoring of the shale triaxial testing process. Through the synergistic effect of these devices, this method can achieve full monitoring of the shale triaxial testing process, providing important technical support for engineering safety, helping to reduce potential risks and protect personnel and property.

[0055] Those skilled in the art will appreciate that embodiments of the present invention may be provided as systems or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0056] The present invention is described with reference to flowcharts and / or block diagrams of devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0057] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0058] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A shale triaxial test monitoring and early warning system integrated with 3D CT scanning, characterized by: It includes a three-dimensional CT scanning device, a triaxial testing device, a data analysis device and an intelligent monitoring device connected in sequence. The three-dimensional CT scanning device obtains three-dimensional structural characteristic information of shale and information on changes in shale structural characteristics during the triaxial test process; The triaxial test device obtains stress, strain and crack information of the shale triaxial test in the whole process; The data analysis device acquires the stress and strain, internal microstructure parameters and crack changes of the shale in real time, and calculates the peak stress and peak strain of the shale based on the internal structural characteristics acquired by the three-dimensional CT scanning device; The intelligent monitoring device receives the data transmitted by the data analysis device and performs real-time monitoring of the stress, strain, cracks and microstructure of the whole triaxial test.

2. The shale triaxial test monitoring and early warning system integrated with 3D CT scanning according to claim 1 is characterized by: The three-dimensional CT scanning device includes a sample placement table, the bottom of the sample placement table is connected to the top of the transmission ring, the bottom of the transmission ring is connected to the three-dimensional laser scanner, and a transmission switch is provided on the transmission ring to control the unobstructed or blocked state of the transmission ring.

3. The shale triaxial test monitoring and early warning system integrated with 3D CT scanning according to claim 1 or 2, characterized in that: The triaxial testing device includes an outer shell, which is a square frame. A base is provided at the bottom of the outer shell, and a pressure chamber is provided above the base. One end of the pressure chamber is connected to a hydraulic loading pump through a transmission pipe, and the other end of the pressure chamber is connected to a confining pressure loading pump through a transmission pipe. A pressure ball is provided above the pressure chamber, and the pressure ball is connected to a loading control device. The loading control device controls the exact position of the pressure ball, and the loading control device is placed on the top of the outer shell.

4. The shale triaxial test monitoring and early warning system integrated with 3D CT scanning according to claim 3 is characterized by: The loading control device includes a main frame, which is in the shape of a long frame. A protective cover is provided on the outside of the main frame, and an axial push rod and a radial push rod are vertically provided inside the main frame. A positioning ball is provided at the intersection of the axial push rod and the radial push rod. The axial push rod is controlled by an axial control button, the radial push rod is controlled by a radial control button, and the positioning ball is controlled jointly by the axial control button and the radial control button.

5. The shale triaxial test monitoring and early warning system integrated with 3D CT scanning according to claim 1 or 2, characterized in that: The data analysis device includes a structural feature analysis module, a stress analysis module, and a strain analysis module. The structural feature analysis module receives structural feature information of the shale after being scanned by the three-dimensional CT scanning device, the stress analysis module receives stress information after the triaxial testing device acts, and the strain analysis module receives strain information after the triaxial testing device acts. The stress analysis module calculates the peak stress of the shale based on the shale structural feature information obtained by the structural feature analysis module, and the strain analysis module calculates the peak strain of the shale based on the shale structural feature information obtained by the structural feature analysis module.

6. The shale triaxial test monitoring and early warning system integrated with 3D CT scanning according to claim 1 or 2, characterized in that: The triaxial test device is connected to the data analysis device via a first connecting rod, and the data analysis device is connected to the intelligent monitoring device via a second connecting rod.

7. The shale triaxial test monitoring and early warning system integrated with 3D CT scanning according to claim 6 is characterized by: The connecting rod comprises an insulating shell, which is in the shape of a circular column. Connecting elements are provided at both ends of the insulating shell, and adjusting nuts are provided inside the connecting elements. A conducting optical fiber is wound around the outside of the insulating shell.

8. A shale triaxial test monitoring and early warning method integrated with 3D CT scanning, utilizing the shale triaxial test monitoring and early warning system integrated with 3D CT scanning according to any one of claims 1 to 7, characterized in that: The following steps are included: S1: The sample is placed on the sample placement table, and the 3D laser scanner scans the sample to obtain the structural and pore structure parameter information of the shale; S2: Adjust the transmission switch to transmit the sample to the triaxial test device through the transmission ring to perform shale triaxial testing and obtain shale mechanical parameters; S3: The data analysis device obtains the changes in shale structural characteristics and rock mechanical parameters during the entire triaxial test process; S4: The data analysis device monitors the changes in mechanical data during the shale triaxial test and transmits the signals to the intelligent monitoring device for real-time monitoring.

9. The shale triaxial test monitoring and early warning method integrated with 3D CT scanning according to claim 8 is characterized by: In S3, the data analysis device includes a structural feature analysis module, a stress analysis module and a strain analysis module. The structural feature analysis module obtains changes in shale structural features during the entire triaxial test process. The stress analysis module and the strain analysis module obtain changes in shale mechanical parameters during the entire triaxial test process. The data analysis device obtains the peak stress and peak strain of the shale in real time.

10. The shale triaxial test monitoring and early warning method integrated with three-dimensional CT scanning according to claim 9, characterized in that: In S4, when the shale reaches peak stress and peak strain, the data analysis device transmits a signal to the intelligent monitoring device, which issues an early warning signal.

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