An annular core deformation measurement system and method of using the same

Abstract

The present application relates to a kind of annular core deformation measurement systems and its use method, including from top to bottom sequentially connected upper clamping head, electronic component warehouse, radial displacement measuring device, axial displacement measuring device and lower clamping head.The upper clamping head is connected with the one end of electronic component warehouse by screw thread, the other end of electronic component warehouse is connected with radial displacement measuring device by screw thread, the other end of radial displacement measuring device is connected with axial displacement measuring device by screw thread, the other end of axial displacement measuring device is connected with lower clamping head by screw thread.The annular core deformation measurement system works in borehole, and no electronic component is exposed in borehole environment, the measurement system is not affected by temperature and water pressure in borehole, theoretically not limited by measuring depth, break through the technical bottleneck that stress relief method cannot be applied in deep hole.

Description

Technical Field

[0001] This invention relates to the field of geological exploration technology, and in particular to a ring core deformation measurement system and its usage method. Background Technology

[0002] Deep rock masses exist within a vast in-situ stress field. This exceptionally high stress field accumulates enormous deformation energy, leading to various stress-controlled failures in the surrounding rock, such as spalling, rockbursts, and large-scale compression deformations. Furthermore, these failures increase in intensity, scale, and energy level with increasing depth, causing serious hazards. Therefore, high stress is a key factor affecting the safety and stability of deep engineering projects, making the implementation of deep rock mass stress measurement crucial.

[0003] The theoretical methods and technical approaches for deep geostress measurement still have certain limitations. Conventional geostress measurement equipment based on stress relief methods cannot meet the needs of deep measurements. The main reason is the harsh environment of high temperature and high water pressure in deep boreholes. Conventional measurement equipment, which requires electronic sensors to be in direct contact with the borehole wall, cannot be used in such environments, thus failing to obtain the core deformation parameters needed for geostress calculation. In addition, conventional measurement equipment needs to be fixed to the borehole wall with adhesive, which is difficult in deep borehole environments and usually takes several hours, severely restricting the efficiency of geostress measurement.

[0004] To overcome the limitations of classical geostress testing methods in terms of measurement depth and achieve rapid measurement of deep geostress under complex environments such as high temperature and high water pressure, this patent discloses a ring core deformation measurement system. This system can quickly measure the deformation parameters of the ring core after stress relief, which are required for geostress calculation, in complex borehole environments. These parameters include radial displacement, axial displacement, and deflection characteristics in multiple directions, providing a new technical method for deep geostress measurement. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art by providing a ring core deformation measurement system and its usage method.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A ring core deformation measurement system, comprising an upper clamping head, an electronic component compartment, a radial displacement measuring device, an axial displacement measuring device, and a lower clamping head connected sequentially from top to bottom;

[0007] The upper clamping head includes a spearhead and a first expansion support assembly, wherein the spearhead is fixed to one end of the first expansion support assembly;

[0008] The lower clamping head includes an arc-shaped head and a second expansion support assembly. The arc-shaped head is fixed to one end of the second expansion support assembly. The spearhead and the arc-shaped head are located at both ends of the measuring system. The first expansion support assembly and the second expansion support assembly expand radially when subjected to axial pressure.

[0009] The electronic component compartment includes a housing, a bracket, an LED light source, an imaging component, an electronic compass, a dual-axis tilt sensor, a data processing module, a battery, and a switch;

[0010] The radial displacement measuring device includes a housing, multiple radial probes, and a transparent glass. A ring of through holes is equidistantly arranged on the side wall of the housing. The radial probes are inserted into the through holes. Each radial probe is equipped with a probe spring assembly. The transparent glass is sealed and fixed to the upper end of the housing with glue.

[0011] The axial displacement measuring device includes an outer cover, two axial probes, a lever, a push rod, and a second spring. Each axial probe is equipped with a probe spring assembly, and the two axial probes are symmetrically inserted into the through hole.

[0012] Preferably, in the above-mentioned annular core deformation measurement system, the first expansion support assembly and the second expansion support assembly have the same structure. Both the first expansion support assembly and the second expansion support assembly include a slide rod, multiple ribs, a rubber band, and a guide rod. The slide rod has multiple rectangular grooves arranged at equal angles on its side, and a cylindrical hole is provided in the axial direction inside the slide rod. The ribs correspond one-to-one with the rectangular grooves, and the inner side of the ribs is embedded in the rectangular grooves. The ribs are slidably connected to the rectangular grooves.

[0013] Preferably, in the above-mentioned annular core deformation measurement system, a groove is provided at one end of the inner side of the rib, and the groove is used to engage a spearhead or an arc-shaped head.

[0014] Preferably, in the above-mentioned annular core deformation measurement system, the outer side of the ribs is provided with circumferential grooves near both ends, the rubber bands are wrapped around the outer side of the multiple ribs, and the rubber bands are embedded in the grooves.

[0015] Preferably, in the above-mentioned annular core deformation measurement system, the guide rod extends from the internal cylindrical hole of the slide rod, the other end of the guide rod in the upper clamping head is connected to the spearhead by a thread, the other end of the guide rod in the lower clamping head is connected to the arc-shaped head by a thread, the depth of the rectangular groove increases in the axial direction, and when the slide rod in the upper clamping head slides toward the spearhead, the outer diameter of the circle formed by multiple ribs gradually increases.

[0016] Preferably, in the above-mentioned annular core deformation measurement system, the probe elastic component includes a first spring, the inner cavity of the outer shell is fixed with a limit card, and the limit card is provided with a plurality of U-shaped grooves at equal intervals, the number of the U-shaped grooves being the same as the number of probes.

[0017] Preferably, in the above-mentioned annular core deformation measurement system, the radial probe and the axial probe each include an arc-shaped contact end, a first stepped surface, a second stepped surface, a limiting ring, and a needle tip. The limiting ring is fixedly sleeved on the outside of the radial probe. A first spring is sleeved on the outside of both the radial probe and the axial probe. The first spring is located between the first stepped surface and the limiting ring.

[0018] Preferably, in the above-described annular core deformation measurement system, both the radial probe and the axial probe pass through the U-shaped groove, and the limiting ring is located on the other side of the U-shaped groove.

[0019] Preferably, in the above-described annular core deformation measurement system, the second spring is sleeved outside the top rod, the top rod passes through the outer casing and the two are slidably connected, the lever is bent, the lever is hinged to the inner wall of the outer casing, one side of the upper end of the lever contacts one end of the axial probe, the lower end of the lever contacts the upper side of the top rod, the upper end of the top rod is truncated cone-shaped, and the lower end of the lever is arc-shaped.

[0020] Preferably, in the above-described annular core deformation measurement system, the lower end of the top rod is fixedly connected to a connecting plate, and the second spring is located between the outer cover and the connecting plate.

[0021] A method for using a ring core deformation measurement system:

[0022] S1. Use drilling tools to pre-drill a measuring hole at the geostress measurement location for installing the annular core deformation measurement system;

[0023] S2. The hoisting spearhead is used to install the annular core deformation measurement system into the measurement hole, and the spearhead is hammered to compress the upper and lower clamping heads, expanding the outer diameter of the clamping heads to make them in close contact with the wall of the measurement hole, thus completing the fixation of the annular core deformation measurement system in the measurement hole;

[0024] S3. After the ring core deformation measurement system is installed, use drilling tools to drill a core hole with a diameter greater than twice the diameter of the measurement hole, and the drilling depth of the core hole is greater than the drilling depth of the measurement hole.

[0025] S4. After the core hole is drilled, the annular core is pulled out and the core and annular core deformation measurement system are retrieved. Observe whether the annular core is intact. If it is intact, the measurement is completed. If it is not intact, repeat steps S1 to S4 until a complete annular core is taken out and the measurement ends.

[0026] S5. After the on-site measurement was completed, the radial displacement, axial displacement, and deflection angles in two directions of the annular core were obtained. The in-situ stress can then be calculated using the theory of elasticity.

[0027] The beneficial effects of this invention are: when the annular core deformation measurement system works in the borehole, no electronic components are exposed to the borehole environment, the measurement system is not affected by the temperature and water pressure in the borehole, and theoretically it is not limited by the measurement depth, thus breaking through the technical bottleneck that the stress relief method cannot be applied in deep holes. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the annular core deformation measurement system.

[0029] Figure 2 This is a schematic diagram of the upper clamping head;

[0030] Figure 3 This is a schematic diagram of the lower clamping head.

[0031] Figure 4 This is a schematic diagram of the radial measuring device.

[0032] Figure 5 This is a schematic diagram of the radial probe structure;

[0033] Figure 6 This is a schematic diagram of the limit card structure;

[0034] Figure 7 This is a schematic diagram of the axial measuring device.

[0035] Figure 8 This is a schematic diagram of the assembly structure of the radial probe and the axial probe;

[0036] Figure 9 This is a schematic diagram of the internal structure of the electronic component compartment;

[0037] Figure 10 A schematic diagram of the structure for pre-drilling the measuring hole;

[0038] Figure 11 A schematic diagram of the structure for installing the annular core deformation measurement system;

[0039] Figure 12 This is a schematic diagram of the structure for drilling the core hole;

[0040] Figure 13 A schematic diagram of the structure for recovering the annular core and the annular core deformation measurement system.

[0041] The attached diagram lists the components represented by each number as follows:

[0042] 1. Upper clamping head; 11. Slide rod; 111. Rectangular groove; 12. Rib; 13. Rubber band; 14. Guide rod; 15. Spearhead; 2. Electronic component compartment; 21. Housing; 22. Bracket; 23. LED light source; 24. Imaging component; 25. Electronic compass; 26. Dual-axis tilt sensor; 27. Data processing module; 28. Battery; 29. ​​Switch; 3. Radial displacement measuring device; 31. Housing; 32. Radial probe; 321. Arc-shaped contact. 322. First step surface, 323. Second step surface, 324. Limiting ring, 325. Needle tip, 33. Limiting clip, 331. U-shaped groove, 34. First spring, 35. Transparent glass, 4. Axial displacement measuring device, 41. Outer cover, 42. Axial probe, 43. Lever, 44. Positioning pin, 45. Top rod, 46. Second spring, 47. Connecting plate, 5. Lower clamping head, 51. Arc-shaped head, 6. Measuring hole, 7. Core sampling hole, 8. Annular core. Detailed Implementation

[0043] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0044] like Figure 1 As shown, a ring core deformation measurement system includes, from top to bottom, an upper clamping head 1, an electronic component compartment 2, a radial displacement measuring device 3, an axial displacement measuring device 4, and a lower clamping head 5. The upper clamping head 1 is connected to one end of the electronic component compartment 2 via threads. The other end of the electronic component compartment 2 is connected to the radial displacement measuring device 3 via threads. The other end of the radial displacement measuring device 3 is connected to the axial displacement measuring device 4 via threads. The other end of the axial displacement measuring device 4 is connected to the lower clamping head 5 via threads.

[0045] like Figure 2As shown, the upper clamping head 1 includes a spearhead 15 and a first expansion support assembly; the lower clamping head 5 includes an arc-shaped head 51 and a second expansion support assembly, the first and second expansion support assemblies having the same structure. The spearhead 15 is fixed to one end of the first expansion support assembly. The first expansion support assembly includes a slide rod 11, three ribs 12, a rubber band 13, and a guide rod 14. The slide rod 11 has three rectangular grooves 111 arranged at equal angles on its side. A cylindrical hole is provided in the axial direction inside the slide rod 11. The guide rod 14 extends out from the cylindrical hole inside the slide rod 11. A bolt is threaded to one end of the guide rod 14 inside the cylindrical hole. The diameter of the cylindrical hole becomes smaller near the spearhead 15 to prevent the bolt from passing through. The bolt can also act as a limit to prevent the guide rod 14 from disengaging from the cylindrical hole inside the slide rod 11. Guide rod 14 extends from the internal cylindrical hole of slide rod 11. The other end of guide rod 14 in upper clamping head 1 is connected to spearhead 15 via thread, and the other end of guide rod 14 in lower clamping head 5 is connected to arc head 51 via thread. Spearhead 15 and arc head 51 are located at opposite ends of the measuring system. Three ribs 12 correspond one-to-one with three rectangular slots 111. The inner side of rib 12 is embedded in the rectangular slot 111, and rib 12 is slidably connected to rectangular slot 111. A groove is provided at one end of the inner side of rib 12. The groove is used to engage spearhead 15 or arc head 51. That is, spearhead 15 is engaged in the groove in upper clamping head 1, and arc head 51 is engaged in the groove in lower clamping head 5. Circumferential grooves are provided on the outer side of rib 12 near both ends. Rubber bands 13 are wrapped around the outer side of the three ribs 12 and embedded in the grooves. The inner diameter of the rubber band 13 is smaller than the circumference formed by the three ribs 12 embedded in the rectangular groove 111, so that the rubber band 13 maintains an elastic state and the ribs 12 are fixed between the slide bar 11 and the spearhead 15.

[0046] The depth of the rectangular groove 111 increases axially, with a shallower groove further away from the spearhead 15 and a deeper groove closer to it. Since the inner side of the rib 12 is embedded in the rectangular groove 111, the rib 12 is slidably connected to the groove. A protruding strip-shaped slider is provided on the inner side of the rib 12, embedded in the rectangular groove 111 and contacting its inner bottom. When the slide rod 11 slides towards the spearhead 15, the slider is pushed out by the shallower inner bottom of the rectangular groove 111. During this process, the outer diameter of the circle formed by the three ribs 12 gradually increases, meaning the maximum outer diameter of the upper clamping head 1 gradually increases. Therefore, when the upper clamping head 1 is subjected to axial compressive force, its maximum outer diameter gradually increases.

[0047] like Figure 3As shown, the lower clamping head 5 includes an arc-shaped head 51 and a second expansion support assembly. The arc-shaped head 51 is fixed to one end of the second expansion support assembly, and the spearhead 15 and the arc-shaped head 51 are located at both ends of the measuring system. The first expansion support assembly and the second expansion support assembly have the same structure. Therefore, when the lower clamping head 5 is subjected to axial compressive force, the maximum outer diameter of the lower clamping head 5 gradually increases.

[0048] In use, the upper clamping head 1 and the lower clamping head 5 are compressed by axially hammering the spearhead 15, expanding the outer diameter of the clamping head 1 and the lower clamping head 5 to make close contact with the wall of the measuring hole 6, thus completing the fixation of the annular core deformation measuring system in the measuring hole 6.

[0049] like Figure 4 , Figure 5 , Figure 6As shown, the radial displacement measuring device 3 includes a housing 31, multiple radial probes 32, and a transparent glass 35. A ring of through holes is equidistantly arranged on the side wall of the housing 31 for mounting the probes. The probes include radial probes 32 and axial probes 42. Both radial probes 32 and axial probes 42 are inserted into the through holes. Each radial probe 32 is equipped with a probe spring assembly. The transparent glass 35 is sealed and fixed to the upper end of the housing 21 with adhesive. The probe spring assembly includes a first spring 34. A limit card 33 is fixed in the inner cavity of the housing 31. Multiple U-shaped grooves 331 are equidistantly arranged on the limit card 33, the number of which is the same as the number of probes. Both the radial probe 32 and the axial probe 42 include an arc-shaped contact end 321, a first stepped surface 322, a second stepped surface 323, a limiting ring 324, and a needle tip 325. The limiting ring 324 is fixedly sleeved on the outside of the radial probe 32. A first spring 34 is sleeved on the outside of both the radial probe 32 and the axial probe 42. The first spring 34 is located between the first stepped surface 322 and the U-shaped groove 331 of the limiting clip 33. The radial probe 32 passes through the U-shaped groove 331, and the limiting ring 324 is located on the other side of the U-shaped groove 331. The width of the U-shaped groove 331 is smaller than the maximum diameter of the second stepped surface 323 of the radial probe 32 and the outer diameter of the limiting ring 324. The radial probe 32 can make radial linear movement in the through hole of the outer shell 31. This movement stroke is the distance between the second stepped surface 323 of the radial probe 32 and the limiting ring 324. The outer diameter of the first spring 34 is slightly smaller than the maximum diameter of the first step surface 322, and the length of the first spring 34 in its natural state is greater than the distance from the first step surface 322 to the limiting ring 324, ensuring that the first spring 34 is always in a compressed state, so that the contact end 321 of the radial probe 32 can extend out of the outer shell 31 under the action of the first spring 34. The installed radial displacement measuring device 3 includes multiple sets of symmetrical radial probes 32. In the initial state, the tips 325 of the multiple sets of symmetrical radial probes 32 form a circle. When the radial displacement measuring device 3 contacts the borehole wall, the radial probes 32 will follow the borehole wall and undergo synchronous radial displacement. The shape formed by the tips 325 can reflect the cross-sectional shape of the deformed borehole wall.

[0050] like Figure 7 , Figure 8As shown, the axial displacement measuring device 4 includes an outer cover 41, two axial probes 42, a lever 43, a push rod 45, and a second spring 46. Both axial probes 42 are inserted into the through hole and are symmetrically arranged, lying on the same plane as the radial probe 32. The radial probe 32 has the same structure as the axial probe 42, but the axial probe 42 is shorter than the radial probe 32. The radial probe 32 can extend out of the outer cover 31 and directly contact the hole wall, while the axial probe 42 cannot extend out of the outer cover 31. Similarly, both axial probes 42 pass through the U-shaped groove 331, and the limiting ring 324 is located on the other side of the U-shaped groove 331. The second spring 46 is sleeved on the outside of the push rod 45, which passes through the outer cover 41 and the two are slidably connected. The lever 43 is bent and hinged to the inner wall of the housing 31 via a positioning pin 44. The lever 43 can rotate around the positioning pin 44. One side of the upper end of the lever 43 contacts one end of the axial probe 42, and the lower end of the lever 43 contacts the upper side of the push rod 45. The upper end of the push rod 45 is truncated cone-shaped, and the lower end of the lever 43 is arc-shaped. A connecting plate 47 is fixedly connected to the lower end of the push rod 45, and a second spring 46 is located between the outer cover 41 and the connecting plate 47. The lower end of the connecting plate 47 is connected to the lower clamping head 5 via a threaded connection. The axial probe 42 is always in contact with the lever 43 under the action of the first spring 34. The lever 43 is installed in the housing 31 of the radial displacement measuring device via the positioning pin 44 and can rotate around the positioning pin 44. Under the action of the second spring 46, it can move in the axial direction. During the movement of the push rod 45 along the axis, it drives the lever 43 to rotate around the positioning pin 44, thereby moving the axial probe 42 radially, and finally realizing the conversion of axial displacement into radial displacement.

[0051] like Figure 9As shown, the electronic component compartment 2 includes a housing 21, a bracket 22, an LED light source 23, an imaging component 24, an electronic compass 25, a dual-axis tilt sensor 26, a data processing module 27, a battery 28, and a switch 29. The bracket 22 is located inside the electronic component compartment 2 and is connected to the radial displacement measuring device 3 via screw threads, without contacting the housing 21. The LED light source 23, imaging component 24, electronic compass 25, dual-axis tilt sensor 26, data processing module 27, and battery 28 are all fixed to the bracket 22. The light from the LED light source 23 can pass through the transparent glass 35 to illuminate the interior of the radial displacement measuring device 3. The imaging component 24 uses microscopic optical imaging technology to photograph the plane containing the radial probe 32 and the axial probe 42, recording the tip displacements of the radial probe 32 and the axial probe 42. The electronic compass 25 is calibrated at 0°, true north, and the azimuth of one of the radial probes 32. The azimuth indicated by the electronic compass 25 is the geographical azimuth of the calibrated radial probe 32. The azimuths of the other radial probes 32 are determined by their angular relationship with the calibrated radial probe 32, thus determining the azimuth of all radial probes 32 within the borehole. A dual-axis tilt sensor 26 is arranged perpendicular to the electronic compass 25, enabling the measurement of deflection angles in two mutually perpendicular directions. The data processing module 27 fuses and stores the video data acquired by the imaging component 24, the azimuth data acquired by the electronic compass 25, and the deflection data acquired by the dual-axis tilt sensor 26. The battery 28 powers the LED light source 23, imaging component 24, electronic compass 25, dual-axis tilt sensor 26, and data processing module 27, ensuring the measurement system can operate normally within the borehole for extended periods. The switch 29 is designed as a plug-in type; inserting the switch 29 powers on all electronic components inside the electronic component compartment 2. The electronic component compartment protects the internal components from the high temperature and high pressure water inside the borehole, enabling the measurement system to supply power, acquire data, and store data inside the borehole, thus ensuring that the measurement system can perform ground stress measurement in deep holes.

[0052] The method of using this annular core deformation measurement system is as follows:

[0053] S1. Using drilling tools, pre-drill a measuring hole 6 (e.g., at the location for installing the annular core deformation measuring system) at the geostress measurement position. Figure 10 (as shown);

[0054] S2. The hoisting spearhead 15 is used to install the annular core deformation measurement system into the measurement hole 6, and the spearhead 15 is hammered to compress the upper clamping head 1 and the lower clamping head 5, expanding the outer diameter of the clamping head 1 and the lower clamping head 5 until they are in close contact with the wall of the measurement hole 6, thus completing the fixation of the annular core deformation measurement system in the measurement hole 6 (e.g., Figure 11 (as shown);

[0055] S3. After the annular core deformation measurement system is installed, use drilling tools to drill a core hole 7 with a diameter greater than 3 times the diameter of the measuring hole 6. The drilling depth of the core hole 7 should be greater than the drilling depth of the measuring hole 6 (e.g., Figure 12 (as shown);

[0056] S4. After core hole 7 is drilled, break off the annular core 8 and retrieve the core and the annular core deformation measurement system. Observe whether the annular core is intact. If it is intact, the measurement is complete. If it is incomplete, repeat steps S1 to S4 until a complete annular core is retrieved, and the measurement ends. Figure 13 (as shown);

[0057] S5. After the on-site measurement was completed, the radial displacement, axial displacement, and deflection angles in two directions of the annular core were obtained. The in-situ stress can then be calculated using the theory of elasticity.

[0058] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0059] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0060] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A ring-shaped rock core deformation measurement system, characterized in that: It includes an upper clamping head (1), an electronic component compartment (2), a radial displacement measuring device (3), an axial displacement measuring device (4), and a lower clamping head (5) connected from top to bottom. The upper clamping head (1) includes a spearhead (15) and a first expansion support assembly, wherein the spearhead (15) is fixed to one end of the first expansion support assembly; The lower clamping head (5) includes an arc-shaped head (51) and a second expansion support assembly. The arc-shaped head (51) is fixed at one end of the second expansion support assembly. The spearhead (15) and the arc-shaped head (51) are located at both ends of the measuring system. The first expansion support assembly and the second expansion support assembly expand radially when subjected to axial pressure. The electronic component compartment (2) includes a housing (21), a bracket (22), an LED light source (23), an imaging component (24), an electronic compass (25), a dual-axis tilt sensor (26), a data processing module (27), a battery (28), and a switch (29). The radial displacement measuring device (3) includes a housing (31), multiple radial probes (32) and a transparent glass (35). A ring of through holes is equidistantly arranged on the side wall of the housing (31). The radial probes (32) are inserted into the through holes. Each radial probe (32) is equipped with a probe elastic component. The transparent glass (35) is sealed and fixed to the upper end of the housing (21) with glue. The axial displacement measuring device (4) includes an outer cover (41), two axial probes (42), a lever (43), a top rod (45), and a second spring (46). Each axial probe (42) is equipped with a probe spring assembly. The two axial probes (42) are symmetrically inserted into the through hole. The second spring (46) is sleeved on the outside of the top rod (45). The top rod (45) passes through the outer cover (41) and the two are slidably connected. The lever (43) is bent and hinged to the inner wall of the outer shell (31). One side of the upper end of the lever (43) contacts one end of the axial probe (42), and the lower end of the lever (43) contacts the upper side of the top rod (45). The upper end of the top rod (45) is truncated cone-shaped, and the lower end of the lever (43) is arc-shaped.

2. The annular core deformation measurement system according to claim 1, characterized in that: The first expansion support assembly and the second expansion support assembly have the same structure. Both the first expansion support assembly and the second expansion support assembly include a slide rod (11), multiple ribs (12), a rubber band (13), and a guide rod (14). The slide rod (11) has multiple rectangular grooves (111) arranged at equal angles on its side. The slide rod (11) has a cylindrical hole in the axial direction inside. The ribs (12) correspond one-to-one with the rectangular grooves (111). The inner side of the ribs (12) is embedded in the rectangular grooves (111). The ribs (12) are slidably connected to the rectangular grooves (111).

3. The annular core deformation measurement system according to claim 2, characterized in that: A groove is provided at one end of the inner side of the rib (12), which is used to insert the spearhead (15) or the arc-shaped head (51).

4. The annular core deformation measurement system according to claim 3, characterized in that: The outer side of the rib (12) is provided with a circumferential groove near both ends, and the rubber band (13) is wrapped around the outer side of the multiple ribs (12) and embedded in the groove.

5. The annular core deformation measurement system according to claim 4, characterized in that: The guide rod (14) extends from the inner cylindrical hole of the slide rod (11). The other end of the guide rod (14) in the upper clamping head (1) is connected to the spearhead (15) by a thread. The other end of the guide rod (14) in the lower clamping head (5) is connected to the arc-shaped head (51) by a thread. The depth of the rectangular groove (111) increases along the axial direction. When the slide rod (11) in the upper clamping head (1) slides toward the spearhead (15), the outer diameter of the circle formed by multiple ribs (12) gradually increases.

6. The annular core deformation measurement system according to claim 1, characterized in that: The probe elastic assembly includes a first spring (34), and a limiting card (33) is fixed in the inner cavity of the outer shell (31). A plurality of U-shaped grooves (331) are equidistantly arranged on the limiting card (33), and the number of the U-shaped grooves (331) is the same as the number of probes.

7. The annular core deformation measurement system according to claim 6, characterized in that: Both the radial probe (32) and the axial probe (42) include an arc-shaped contact end (321), a first stepped surface (322), a second stepped surface (323), a limiting ring (324), and a needle tip (325). The limiting ring (324) is fixedly sleeved on the outside of the radial probe (32). Both the radial probe (32) and the axial probe (42) are sleeved with a first spring (34), which is located between the first stepped surface (322) and the limiting card (33).

8. The annular core deformation measurement system according to claim 7, characterized in that: The radial probe (32) and the axial probe (42) both pass through the U-shaped groove (331), and the limiting ring (324) is located on the other side of the U-shaped groove (331).

9. The annular core deformation measurement system according to claim 1, characterized in that: The lower end of the top rod (45) is fixedly connected to a connecting plate (47), and the second spring (46) is located between the outer cover (41) and the connecting plate (47).

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