Double-layer circular tube type temperature-stress-pressure static crushing synchronous testing method
Through the double-layer round tube temperature-stress-pressure static crushing synchronization test method, the problem that the traditional outer tube method cannot synchronously measure temperature and gas pressure changes is solved, and accurate real-time monitoring of data during the hydration and expansion of the crushing agent is achieved, avoiding the spray hole phenomenon and cleaning difficulties.
Patent Information
- Application Number
- CN202510347670.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2025-06-13
AI Technical Summary
When measuring the expansion pressure generated by the static cracking agent reaction, the traditional outer tube method cannot obtain the temperature and gas pressure change data simultaneously, and there are problems such as spraying orifice phenomenon and cleaning difficulties.
The double-layer round tube type temperature-stress-pressure static crushing synchronous test method is adopted. By installing a strain gauge, a temperature collector and a pressure gauge on the double-layer round tube device, combined with a columnar vibrator and a high-elastic silicon rubber ring, the precise real-time test of temperature-stress-pressure during the hydration expansion of the crushing agent is achieved.
It realizes accurate real-time monitoring of temperature, stress and pressure during the reaction of crushing agent and water, avoids the spraying phenomenon, simplifies the cleaning process, and improves the accuracy and safety of test data.
Smart Images
Figure CN120141578A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of static fracturing, and particularly relates to a synchronous testing method for static fracturing of double-layer circular tube type temperature-stress-pressure. Background Art
[0002] Static fracturing technology (abbreviated as SCA), also known as silent blasting and static cracking technology, is a technology that uses the expansion pressure generated after mixing a static cracking agent with water to act on concrete and stone to cause them to crack. It has the advantages of no blasting sound, no flying stones, no pollution, etc. In recent years, it has also been gradually applied to the field of enhancing the permeability of low-permeability coal seams. SCA is a powdery substance mainly composed of calcium oxide, which expands after contacting water; when CaO reacts with water under closed conditions, a huge expansion pressure will be generated. After injecting SCA into the drill holes in the rock mass, high-temperature gas and expansion pressure are generated during the hydration reaction to break the rock; the resulting expansion pressure will form a highly connected fracture network in the rock.
[0003] In static cracking technology, the magnitude of the expansion pressure directly affects the static cracking effect, and its accurate measurement is an important link in the research process of the expansion mechanism. The traditional measurement method is the outer tube method, and the disadvantage is that during the reaction of the static cracking agent, the phenomenon of hole spraying is likely to occur. Because after the cracking agent undergoes a hydration reaction, the temperature inside the cylinder rises sharply, and the saturated vapor pressure of H 2 O increases and exceeds the local atmospheric pressure. According to the ideal gas state equation pV = nRT, when the pores are compressed and the H 2 O vapor is superheated, the vapor pressure inside the pores will rise rapidly, resulting in the phenomenon of hole spraying.
[0004] The traditional outer tube method can only measure the expansion stress generated by the reaction of the cracking agent through strain gauges, and cannot synchronously obtain the temperature change and gas pressure data during the hydration reaction process. Moreover, the cracking agent and water are mostly mixed and placed, and manual stirring is required in advance. This not only makes it difficult to ensure sufficient contact between the cracking agent and water, resulting in inconsistent hydration reaction processes, unstable stress and pressure generated, but also the pre-stirring operation is cumbersome, increasing the human burden and posing a huge safety hazard at the same time.
[0005] On the other hand, in terms of the practicability and safety of the testing device, traditional equipment also has defects. When testing the expansion pressure by the traditional outer tube method, seamless steel pipes are usually not reused, and the testing method for sealing the pipe orifice often does not set a pressure relief system, increasing the experimental cost while being time-consuming and laborious, and lacking a safety barrier.
[0006] After the test, the final cleaning stage. After generating a large expansion pressure, the volume of the expansive agent after the reaction increases and turns into calcium hydroxide and some other substances, filling the entire test tube, making it difficult to remove the residue of the expansive agent. Most traditional methods use tools to chisel or chemical reagents for acidification treatment. However, the lower end of the test tube is welded in advance and cannot be removed, making the cleaning difficult and resulting in the inability to reuse the test tube.
[0007] The traditional outer tube test method can only measure the expansion stress generated by the reaction of the rock breaker through strain gauges, and cannot synchronously obtain the temperature and gas pressure change data during the hydration reaction, with obvious monitoring limitations. Moreover, during the hydration reaction of the expansive agent, the open top is prone to the phenomenon of jetting holes.
[0008] Therefore, aiming at the deficiencies faced by the existing outer tube method in testing the expansion pressure, it is necessary to develop a double-layer circular tube type temperature-stress-pressure synchronous monitoring device and method for the reaction of the rock breaker to achieve accurate real-time testing of temperature-stress-pressure during the hydration expansion process of the rock breaker. Summary of the Invention
[0009] To solve the above technical problems, the present invention provides a double-layer circular tube type temperature-stress-pressure static crushing synchronous test method with high safety and reliability, having a vibration stirring function, facilitating the cleaning of reaction residues, and more accurate test results.
[0010] To achieve the above object, the present invention adopts the following technical solutions: The double-layer circular tube type temperature-stress-pressure static crushing synchronous test method includes the following steps: S1. Install the double-layer circular tube type test device and load the rock breaker. S2. Vertically place the double-layer circular tube type test device on the support vibration device. S3. Paste strain gauges on the double-layer circular tube type test device, connect the strain gauges to the strain gauge instrument, connect the temperature acquisition instrument to the RF reader, and connect the strain gauge instrument and the temperature acquisition instrument to the computer at the same time. S4. Conduct temperature-stress-pressure static crushing synchronous test. S5. After the test, clean the reaction residues.
[0011] The double-layer circular tube type test device includes an outer tube and an inner tube arranged vertically. The inner tube is coaxially arranged inside the outer tube. The outer circle of the inner tube is connected to the inner wall of the outer tube through several connecting rods. A plurality of water permeable holes are evenly opened on the inner tube. The upper and lower ends of the outer tube and the inner tube are flush. The upper end of the outer tube is threadedly connected with a top cover, and the lower end of the outer tube is threadedly connected with a bottom cover.
[0012] A pressure gauge, a water injection pipe and a pressure relief valve are connected to the top cover. The lower port of the water injection pipe is located at the center of the inner pipe. An injection valve is provided on the water injection pipe. A wireless temperature sensor is provided on the inner wall of the outer pipe. The strain gauge is bonded to the outer circumference of the outer pipe.
[0013] The support vibration device includes a bracket. Four vertical pull rods are fixedly provided on the bracket. The lower ends of the four vertical pull rods are fixedly provided with a lower flat plate through a lower nut. The upper ends of the four vertical pull rods are fixedly provided with an upper ring plate through an upper nut. A columnar vibrator is connected to the lower flat plate by bolts. A groove is provided at the upper end of the columnar vibrator. The inner diameter of the inner hole of the upper ring plate is larger than the outer diameter of the outer pipe. The double-layer circular tube test device is coaxially arranged inside the upper ring plate. The bottom cover at the lower end of the outer pipe extends into and is assembled into the groove of the columnar vibrator. A lower high-elastic silicone rubber ring is provided between the outer circumference of the outer pipe and the inner circumference of the groove. An upper high-elastic silicone rubber ring that contacts the outer circumference of the outer pipe is provided on the inner circumference of the upper ring plate.
[0014] Step S1 is specifically as follows: Rotate the lower nut to remove the lower flat plate. Place the columnar vibrator on the lower flat plate and fix it with bolts. Then reinstall the lower flat plate to the lower end of the vertical pull rod and fix it with the lower nut; Fix wireless temperature sensors at two opposite positions on the inner wall of the outer pipe, 6 cm away from the upper and lower ports. Fix the wireless temperature sensors with high-temperature resistant epoxy resin. Then tighten the bottom cover. Pour the fracturing agent into the annular cavity between the outer pipe and the inner pipe from the upper port of the outer pipe until it reaches 5 cm from the upper port and stop charging. Then tighten the top cover.
[0015] Step S2 is specifically as follows: Lower the double-layer circular tube test device from the inner hole of the upper ring plate down among the four vertical pull rods until the bottom cover at the lower end of the outer pipe enters the groove and contacts the columnar vibrator and then stop. At this time, the upper high-elastic silicone rubber ring and the lower high-elastic silicone rubber ring are respectively sleeved on the upper and lower parts of the outer pipe.
[0016] Step S3 is specifically as follows: Stick a strain gauge at three positions on the outer wall of the outer pipe, 15 cm, 30 cm and 45 cm away from the upper port respectively. Then connect the strain gauge to the strain gauge through a wire. Connect the temperature acquisition instrument and the RF reader with wires. And connect the strain gauge and the temperature acquisition instrument to the computer at the same time. Then turn on the power to debug the equipment.
[0017] Step S4 is specifically as follows: Debug and check the pressure gauge. After ensuring that the pressure gauge is correct, open the injection valve. Clear water is injected into the inner pipe through the water injection pipe. Control the injection speed through the injection valve. Close the injection valve when the pre-calculated injection time is reached. The water in the inner pipe reacts with the fracturing agent through the water permeable holes. The fracturing agent slowly expands inside the outer pipe. Turn on the switch of the columnar vibrator and slowly adjust the vibration frequency to drive the entire double-layer circular tube test device to vibrate, promoting the uniform and rapid mixing of the fracturing agent and water. Observe and record the reading of the pressure gauge during the reaction process. The strain gauge and the wireless temperature sensor monitor the data and transmit them to the strain gauge and the temperature acquisition instrument respectively.
[0018] Step S5 is specifically as follows: After the test is completed, wait for the temperature of the outer tube to drop to the safe range before slowly opening the pressure relief valve. After the internal pressure relief of the outer tube is completed, first remove the strain gauge, then pull the entire double-layer circular tube test device upward out of the upper ring plate, and finally open the top cover and the bottom cover to clean the reaction residue.
[0019] During the reaction in Step S4, the temperature and pressure data are directly obtained through a temperature collector and a pressure gauge respectively. However, the expansion stress data collected by the strain gauge need to be converted and calculated. To convert the micro-strain reading collected by the strain gauge into expansion stress, it needs to be calculated through the following formula: In the formula: P r is the expansion pressure of the static fracturing agent, MPa; E s is the elastic modulus of the steel pipe. For the outer tube made of steel pipe, take 2.06×10 5 MPa; K 1 is the outer diameter of the outer tube, mm; K 2 is the inner diameter of the steel pipe, mm; is the strain in the circumferential direction of the steel pipe, μm; v is the Poisson's ratio, take 0.3.
[0020] Adopting the above technical solution, compared with the prior art, it has the following technical effects: The present invention can achieve precise real-time measurement of temperature-expansion stress-gas pressure in the circular tube during the reaction of the fracturing agent with water only with one set of devices; by designing the top cover and the bottom cover threadedly connected to the outer tube, the present invention ensures sealing and effectively avoids the occurrence of spray hole phenomenon, and is also convenient for cleaning work after the experiment, realizing the reuse of the double-layer circular tube test device; by designing a pressure gauge to monitor the pressure change during the test, the present invention can improve the accuracy of the data; the pressure relief valve relieves pressure first after the test is completed to ensure the safety of the test; by arranging a columnar vibrator below the outer tube, the present invention can effectively promote the uniform mixing of the fracturing agent and water, improve the reaction efficiency, and avoid the disadvantages brought by premature stirring; the upper high-elastic silicone rubber and the lower high-elastic silicone rubber ring play a role in buffering the vibration of the columnar vibrator on the double-layer circular tube test device and the internal vibration mixing of the fracturing agent and water, and will not transmit the vibration to the supporting vibration device, ensuring the stability of the supporting vibration device. The present invention sets the upper ring plate to provide central positioning for the double-layer circular tube test device, and is convenient for removing the double-layer circular tube test device after the experiment to solve the disassembly problem during the cleaning of the agent. The circular tube can be directly taken out for the cleaning work of the agent.
[0021] In summary, the present invention is scientifically designed, with a simple and compact structure, comprehensive functions, easy operation, convenient disassembly, recyclable, safe and environmentally friendly, and has higher accuracy of test data. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic assembly structure diagram of the double-layer circular tube type test device and the support vibration device in the present invention.
[0023] Figure 2 It is a top view of the upper ring plate in the present invention.
[0024] Figure 3 It is a schematic structural diagram of the top cover and the bottom cover in the present invention.
[0025] Figure 4 It is a plane development view of the inner tube in the present invention.
[0026] Each reference numeral in the figure is respectively: 1 - lower nut; 2 - bracket; 3 - water injection pipe; 4 - vertical pull rod; 5 - connecting rod; 6 - water permeable hole; 7 - inner tube; 8 - upper ring plate; 9 - upper high elastic silicone rubber ring; 10 - pressure gauge; 11 - water injection valve; 12 - pressure relief valve; 13 - top cover; 14 - wireless temperature sensor; 15 - outer tube; 16 - strain gauge; 17 - columnar vibrator; 18 - lower flat plate; 19 - strain gauge; 20 - temperature collector; 21 - radio frequency reader; 22 - computer; 23 - upper nut; 24 - bottom cover. DETAILED DESCRIPTION OF THE INVENTION
[0027] As Figures 1-4 shown, the double-layer circular tube type temperature-stress-pressure static fragmentation synchronous test method of the present invention includes the following steps: S1. Install the double-layer circular tube type test device and load the fragmentation agent; S2. Vertically place the double-layer circular tube type test device on the support vibration device; S3. Paste the strain gauge 16 on the double-layer circular tube type test device, connect the strain gauge 16 to the strain gauge 19, connect the temperature collector 20 to the radio frequency reader 21, and connect the strain gauge 19 and the temperature collector 20 to the computer 22 at the same time; S4. Conduct temperature-stress-pressure static fragmentation synchronous test; S5. After the test, clean the reaction residue.
[0028] The double-layer circular tube type test device includes a vertically arranged outer tube 15 and an inner tube 7. The inner tube 7 is coaxially arranged inside the outer tube 15. The outer circle of the inner tube 7 is connected to the inner wall of the outer tube 15 through several connecting rods 5. A plurality of water permeable holes 6 are evenly arranged on the inner tube 7. The upper and lower ends of the outer tube 15 and the inner tube 7 are flush. The upper end of the outer tube 15 is threadedly connected with a top cover 13, and the lower end of the outer tube 15 is threadedly connected with a bottom cover 24.
[0029] A pressure gauge 10, a water injection pipe 3 and a pressure relief valve 12 are connected to the top cover 13. The lower port of the water injection pipe 3 is located at the center of the inner pipe 7. A water injection valve 11 is provided on the water injection pipe 3. A wireless temperature sensor 14 is provided on the inner wall of the outer pipe 15. A strain gauge 16 is bonded to the outer circumference of the outer pipe 15.
[0030] The support vibration device includes a bracket 2. Four vertical pull rods 4 are fixedly provided on the bracket 2. The lower ends of the four vertical pull rods 4 are fixedly provided with a lower flat plate 18 through a lower nut 1. The upper ends of the four vertical pull rods 4 are fixedly provided with an upper ring plate 8 through an upper nut 23. A columnar vibrator 17 is connected to the lower flat plate 18 by bolts. A groove is provided at the upper end of the columnar vibrator 17. The inner diameter of the inner hole of the upper ring plate 8 is larger than the outer diameter of the outer pipe 15. The double-layer circular tube type test device is coaxially arranged in the upper ring plate 8. The bottom cover 24 at the lower end of the outer pipe 15 extends into and is assembled into the groove of the columnar vibrator 17. A lower high-elastic silicone rubber ring is provided between the outer circumference of the outer pipe 15 and the inner circumference of the groove. An upper high-elastic silicone rubber ring 9 that contacts the outer circumference of the outer pipe 15 is provided on the inner circumference of the upper ring plate 8.
[0031] Step S1 is specifically as follows: Rotate the lower nut 1 to remove the lower flat plate 18. Place the columnar vibrator 17 on the lower flat plate 18 and fix it with bolts. Then reinstall the lower flat plate 18 to the lower end of the vertical pull rod 4 and fix it with the lower nut 1. Fix the wireless temperature sensors 14 at two opposite positions on the inner wall of the outer pipe 15 at a distance of 6 cm from the upper and lower ports. Fix the wireless temperature sensors 14 with high-temperature resistant epoxy resin. Then tighten the bottom cover 24. Pour the fracturing agent into the annular cavity between the outer pipe 15 and the inner pipe 7 from the upper port of the outer pipe 15 until it reaches 5 cm from the upper port and stop charging. Then tighten the top cover 13.
[0032] Step S2 is specifically as follows: Lower the double-layer circular tube type test device from the inner hole of the upper ring plate 8 into the four vertical pull rods 4 until the bottom cover 24 at the lower end of the outer pipe 15 enters the groove and contacts the columnar vibrator 17 and then stop. At this time, the upper high-elastic silicone rubber ring 9 and the lower high-elastic silicone rubber ring are respectively sleeved on the upper and lower parts of the outer pipe 15.
[0033] Step S3 is specifically as follows: Stick a strain gauge 16 at three positions on the outer wall of the outer pipe 15 at distances of 15 cm, 30 cm and 45 cm from the upper port respectively. Then connect the strain gauge 16 to a strain gauge 19 through a wire. Connect a temperature collector 20 and a radio frequency reader 21 with wires. And connect the strain gauge 19 and the temperature collector 20 to a computer 22 at the same time. Then turn on the power to debug the equipment.
[0034] Step S4 specifically includes: During debugging, check the pressure gauge 10. After ensuring that the pressure gauge 10 is correct, open the water injection valve 11. Clear water is injected into the interior of the inner tube 7 through the water injection pipe 3. Control the water injection speed through the water injection valve 11. When the pre-calculated water injection time is reached, close the water injection valve 11. The water in the inner tube 7 reacts with the expansive agent through the water permeable holes 6. The expansive agent slowly expands inside the outer tube 15. Turn on the switch of the columnar vibrator 17 and slowly adjust the vibration frequency to drive the entire double-layer circular tube test device to vibrate, promoting the uniform and rapid mixing of the expansive agent and water. During the reaction process, observe and record the readings of the pressure gauge 10. The strain gauge 19 and the wireless temperature sensor 14 monitor the data and transmit them to the strain gauge 19 and the temperature collector 20 respectively.
[0035] Step S5 specifically includes: After the test, wait for the temperature of the outer tube 15 to drop to the safe range before slowly opening the pressure relief valve 12. After the internal pressure relief of the outer tube 15 is completed, first remove the strain gauge 16, then pull the entire double-layer circular tube test device upward out of the upper ring plate 8, and finally open the top cover 13 and the bottom cover 24 to clean the slag after the reaction.
[0036] During the reaction process in Step S4, the temperature and pressure data are directly obtained through the temperature collector 20 and the pressure gauge 10 respectively. However, the expansion stress data collected by the strain gauge 16 needs to be converted and calculated. To convert the micro-strain reading collected by the strain gauge 19 into expansion stress, it needs to be calculated through the following formula: In the formula: P r is the expansion pressure of the static fracturing agent, MPa; E s is the elastic modulus of the steel pipe. For the outer tube 15 made of steel pipe, take 2.06×10 5 MPa; K 1 is the outer diameter of the outer tube 15, mm; K 2 is the inner diameter of the steel pipe, mm; is the strain in the circumferential direction of the steel pipe, μm; v is the Poisson's ratio, take 0.3.
[0037] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that; still can modify the present invention or make equivalent replacements, and any modification or partial replacement without departing from the spirit and scope of the present invention should be covered by the scope of the claims of the present invention.
Claims
1. Double-layer circular tube temperature-stress-pressure static crushing synchronous testing method, characterized by: The following steps are involved: S1. Install the double-layer cylindrical test device and load the crushing agent; S2. Place the double-layer circular tube test device vertically on the supporting vibration device; S3. Paste the strain gauge on the double-layer circular tube test device, connect the strain gauge to the strain meter, connect the temperature collector to the radio frequency reader, and connect the strain meter and the temperature collector to the computer at the same time; S4. Conduct temperature-stress-pressure static crushing synchronous test; S5. After the test, clean up the reaction residue.
2. The double-layer circular tube temperature-stress-pressure static crushing synchronous testing method according to claim 1 is characterized in that: The double-layer circular tube testing device includes an outer tube and an inner tube arranged vertically. The inner tube is coaxially arranged inside the outer tube. The outer circle of the inner tube is connected to the inner wall of the outer tube through a plurality of connecting rods. A plurality of water-permeable holes are evenly opened on the inner tube. The upper and lower ends of the outer tube and the inner tube are flush. The upper end of the outer tube is threadedly connected to a top cover, and the lower end of the outer tube is threadedly connected to a bottom cover.
3. The double-layer circular tube temperature-stress-pressure static crushing synchronous testing method according to claim 2 is characterized in that: The top cover is connected with a pressure gauge, a water injection pipe and a pressure relief valve. The lower port of the water injection pipe is located at the center of the inner pipe. The water injection pipe is provided with a water injection valve. The inner wall of the outer pipe is provided with a wireless temperature sensor, and the strain gauge is bonded to the outer circle of the outer pipe.
4. The double-layer circular tube temperature-stress-pressure static crushing synchronous testing method according to claim 3 is characterized in that: The supporting vibration device includes a bracket, on which four vertical tie rods are fixedly provided, a lower plate is fixedly provided at the lower ends of the four vertical tie rods through lower nuts, an upper ring plate is fixedly provided at the upper ends of the four vertical tie rods through upper nuts, a columnar vibrator is connected to the lower plate through bolts, a groove is provided at the upper end of the columnar vibrator, the inner hole diameter of the upper ring plate is larger than the outer diameter of the outer tube, a double-layer circular tube test device is coaxially arranged in the upper ring plate, the bottom cover at the lower end of the outer tube extends into the groove assembled to the columnar vibrator, a lower high-elasticity silicone rubber ring is provided between the outer circle of the outer tube and the inner circle of the groove, and an upper high-elasticity silicone rubber ring in contact with the outer circle of the outer tube is provided on the inner circle of the upper ring plate.
5. The double-layer circular tube temperature-stress-pressure static crushing synchronous testing method according to claim 4 is characterized in that: Step S1 is specifically as follows: turn the lower nut to take out the lower plate, place the columnar vibrator on the lower plate and fix it with bolts, then reinstall the lower plate to the lower end of the vertical pull rod and fix it with the lower nut; fix the wireless temperature sensor at two relative positions 6 cm away from the upper and lower ports of the inner wall of the outer tube, fix the wireless temperature sensor with high temperature resistant epoxy resin, then tighten the bottom cover, pour the crushing agent from the upper port of the outer tube into the annular cavity between the outer tube and the inner tube to stop loading 5 cm from the upper port, and then tighten the top cover.
6. The double-layer circular tube temperature-stress-pressure static crushing synchronous testing method according to claim 5 is characterized in that: Step S2 is specifically as follows: placing the double-layer circular tube test device from the inner hole of the upper ring plate downward into the four vertical pull rods until the bottom cover at the lower end of the outer tube enters the groove and contacts the columnar vibrator and stops. At this time, the upper high-elasticity silicone rubber ring and the lower high-elasticity silicone rubber ring are respectively sleeved on the upper and lower parts of the outer tube.
7. The double-layer circular tube temperature-stress-pressure static crushing synchronous testing method according to claim 6 is characterized in that: Step S3 is specifically as follows: a strain gauge is attached to the outer wall of the outer tube at three locations 15 cm, 30 cm and 45 cm away from the upper port, respectively, and then the strain gauge is connected to the strain meter through a wire, and the temperature collector and the radio frequency reader are connected to the computer at the same time, and the power is turned on to debug the equipment.
8. The double-layer circular tube temperature-stress-pressure static crushing synchronous testing method according to claim 7 is characterized in that: Step S4 is specifically as follows: debug and check the pressure gauge to ensure that the pressure gauge is correct, open the water injection valve, inject clean water into the inner tube from the water injection pipe, control the water injection speed through the water injection valve, close the water injection valve when the pre-calculated water injection time is reached, and the water in the inner tube reacts with the crushing agent through the water permeable hole. The crushing agent slowly expands inside the outer tube, turn on the columnar vibrator switch, slowly adjust the vibration frequency, drive the entire double-layer circular tube test device to vibrate, promote uniform and rapid mixing of the crushing agent and water, observe and record the pressure gauge reading during the reaction process, and the strain gauge and wireless temperature sensor monitor the data and transmit them to the strain gauge and temperature acquisition instrument respectively.
9. The double-layer circular tube temperature-stress-pressure static crushing synchronous testing method according to claim 8, characterized in that: Step S5 is specifically as follows: after the test is completed, wait for the temperature of the outer tube to drop to a safe range before slowly opening the pressure relief valve. After the pressure relief inside the outer tube is completed, first remove the strain gauge, then pull the entire double-layer circular tube test device upwards to remove the upper ring plate, and finally open the top cover and bottom cover to clean up the drug residue after the reaction.
10. The double-layer circular tube temperature-stress-pressure static crushing synchronous testing method according to claim 8, characterized in that: In step S4, during the reaction process, the temperature and pressure data are directly obtained through the temperature acquisition instrument and the pressure gauge, respectively, while the expansion stress data collected by the strain gauge needs to be converted and calculated. The microstrain reading collected by the strain gauge is converted into expansion stress and needs to be calculated by the following formula: Where: P r is the static fracturing agent expansion pressure, MPa; E s is the elastic modulus of the steel pipe, and the outer pipe is made of steel pipe and takes 2.06×10 5 MPa; K 1 is the outer diameter of the outer tube, mm; K 2 is the inner diameter of the steel pipe, mm; is the strain in the circumferential direction of the steel pipe, μm; v is Poisson’s ratio, which is taken as 0.3.