Rock cutting preparation system and cutting method for fidelity reconstruction of deep in-situ environment

Abstract

The invention belongs to the technical field of deep rock mechanics research, and particularly relates to a deep in-situ environment fidelity reconstruction rock cutting preparation system and cutting method.The deep in-situ environment fidelity reconstruction rock cutting preparation system comprises a cutting cabin provided with a cutting cavity; the cutting system is arranged in the cutting cavity, and the cutting system is provided with a sensor group; the temperature and pressure control system is communicated with the cutting cavity; the control system is connected with the cutting system and the temperature and pressure control system; a rock core sample enters the cutting cavity from one side of the cutting cabin, the temperature and pressure control system is used for forming a preset cutting fidelity environment in the cutting cavity, and when the rock core sample is cut, the sensor group is used for collecting tangential force data, feeding resistance data, cutting torque data and cutting vibration data in the cutting process in real time; the control system adjusts the cutting action of the cutting system according to feedback data of the sensor group; the control system carries out temperature compensation and pressure compensation through the temperature and pressure control system according to temperature disturbance and pressure disturbance generated in the cutting process of the cutting system. The invention further provides a rock cutting method.

Description

Technical Field

[0001] This invention belongs to the field of deep rock mechanics research technology, and in particular relates to a rock cutting preparation system and cutting method for in-situ environment fidelity reconstruction. Background Technology

[0002] Deep rock masses exist in complex environments characterized by high stress, high temperature, and high permeability. These extreme environments significantly alter the mechanical response behavior of rocks, fundamentally differing from that of shallow rocks. Therefore, studying and analyzing the mechanical behavior of rocks in in-situ deep environments is a prerequisite for the safe and efficient development of deep resources.

[0003] Traditional rock mechanics tests mostly involve obtaining core samples from deep, in-situ rocks through drilling, and then preparing these core samples directly in the surface environment for testing. This method has significant limitations. Once the core sample reaches the surface from deep strata, if it is directly exposed to ambient temperature and pressure for preparation, the high-temperature and high-pressure environment of the deep in-situ environment is lost. The core sample will undergo stress release and temperature decay, leading to irreversible damage such as microcrack propagation and mineral phase transformation. If mechanical loading tests are then conducted directly, the test results will be distorted compared to the deep in-situ environment, and the research findings will not accurately reflect the mechanical behavior of deep, in-situ rocks.

[0004] Therefore, it is necessary to develop a core sample cutting and preparation system for in-situ deep environmental fidelity reconstruction. This system reconstructs the in-situ temperature and pressure environment of deep strata in the surface environment, cuts and prepares the obtained core samples under fidelity conditions, and then transfers them to fidelity conditions to carry out rock mechanics loading tests. Only in this way can we obtain the true in-situ rock mechanics parameters of deep strata, explore the true mechanical behavior and laws of deep rock masses, and more accurately and effectively guide deep earth engineering practices.

[0005] Therefore, we propose a rock cutting preparation system and cutting method for deep in-situ environmental fidelity reconstruction. Summary of the Invention

[0006] The purpose of this invention is to provide a rock cutting preparation system and cutting method for faithfully reconstructing deep in-situ environments, in order to solve the above-mentioned problems.

[0007] To achieve the above objectives, the present invention provides the following solution: A deep, in-situ environment-fidelity reconstruction system for rock cutting and preparation includes: The cutting chamber is equipped with a cutting cavity.

[0008] A cutting system is installed inside the cutting cavity, and the cutting system is equipped with a sensor group.

[0009] A temperature and pressure control system is connected to the cutting cavity.

[0010] A control system, connected with the cutting system and the temperature and pressure control system.

[0011] The core sample enters the cutting cavity from one side of the cutting cabin, and the temperature and pressure control system is used to form a preset cutting fidelity environment in the cutting cavity. When the core sample is cut, the sensor group is used to collect tangential force data, feeding resistance data, cutting torque data and cutting vibration data in real time during the cutting process. The control system adjusts the cutting action of the cutting system according to the feedback data of the sensor group.

[0012] The control system adjusts the temperature and pressure compensation through the temperature and pressure control system according to the temperature disturbance and pressure disturbance generated during the cutting process of the cutting system.

[0013] Optionally, the cutting cabin is fixed with a left flange and a right flange at both ends respectively, and the cutting cabin, the left flange and the right flange are fixed through the cooperation of studs and nuts.

[0014] The cutting cavity is formed by the cutting cabin, the left flange and the right flange.

[0015] The core sample penetrates the center of the cutting cabin, the left flange and the right flange.

[0016] The core sample is in sealing cooperation with the left flange and the right flange.

[0017] Optionally, the temperature and pressure control system comprises: A high-pressure pump, one end of which is in communication with a water outlet opening on the cutting cabin.

[0018] A mold temperature machine, one end of which is in communication with the other end of the high-pressure pump, and the other end of the mold temperature machine is in communication with a water inlet opening on the cutting cabin.

[0019] The high-pressure pump, the mold temperature machine, the high-pressure pump and the water outlet, and the mold temperature machine and the water inlet are all in communication through high-pressure pipelines.

[0020] Optionally, the cutting system comprises: A cutting part, used for cutting the core sample, which is arranged in the cutting cabin.

[0021] A feeding part, in transmission cooperation with the cutting part through a cylinder push plate, which is used to make the cutting part close to / away from the core sample.

[0022] A sample fixing part, on which the core sample is placed, which is used to fix the core sample.

[0023] Optionally, the cutting part comprises: A blade servo motor, a fixed end of which is fixedly connected to the outer wall of the cutting cabin.

[0024] A blade rotating shaft, one end of which is in transmission cooperation with the output shaft of the blade servo motor, and the other end of which is fixedly connected to a double-blade structure used for cutting the rock core sample.

[0025] A torque sensor for acquiring the cutting torque and a vibration sensor for acquiring the cutting vibration are installed on the blade rotating shaft.

[0026] Optionally, the fixed end of the blade servo motor is fixedly connected to the outer wall of the cutting cabin through a blade motor fixing plate, one end of the output shaft of the blade servo motor is shaft-connected to a transmission gear set, the other end of the transmission gear set is shaft-connected to a blade transmission rod, one end of the blade transmission rod is vertically slidingly connected to a spline sleeve, the blade transmission rod is radially limitedly connected to the spline sleeve, the other end of the spline sleeve is shaft-connected to the input shaft of a converter, and the output shaft of the converter is shaft-connected to the blade rotating shaft.

[0027] The converter is used for converting the rotation of the vertically arranged spline sleeve into the rotation of the horizontally arranged blade rotating shaft.

[0028] The housing of the converter is fixed to the oil cylinder push plate.

[0029] The blade rotating shaft is rotationally arranged at the bottom of the oil cylinder push plate.

[0030] Optionally, the feeding part comprises: A numerical control hydraulic oil cylinder, a fixed end of which is fixed to the outer wall of the cutting cabin through a cutting system motor fixing plate, one end of the numerical control hydraulic oil cylinder is connected to a piston rod, the fixed end of the piston rod is fixedly connected to the cutting cabin, and the movable end of the piston rod is fixed to the oil cylinder push plate.

[0031] The movable end of the piston rod is provided with a first force sensor for collecting the feeding resistance.

[0032] Optionally, the sample fixing part comprises: A clamp servo motor, a fixed end of which is fixedly connected to the outer wall of the cutting cabin through a clamp motor fixing plate, and one end of the output shaft of the clamp servo motor is shaft-connected to a clamp transmission rod.

[0033] A clamp fixing plate is fixed in the cutting cabin, a clamp and a sample groove are connected to the clamp fixing plate, the clamp and the sample groove are correspondingly arranged, and the clamp is in transmission cooperation with the clamp transmission rod.

[0034] A second force sensor for collecting the tangential force is arranged between the bottom of the clamp fixing plate and the inner wall of the cutting cabin.

[0035] Optionally, one end of the left flange is fixed and communicated with one end of a first gate valve, the other end of the first gate valve is fixed and communicated with a coring cabin, the coring cabin is used for placing the core sample, one end of the right flange is fixed and communicated with one end of a second gate valve, the other end of the second gate valve is communicated with a test cabin, and the test cabin is used for taking out the cut core sample.

[0036] A rock cutting method of deep in-situ environment fidelity reconstruction, using the deep in-situ environment fidelity reconstruction rock cutting preparation system, comprises the following steps: The temperature and pressure control system is controlled to form a preset high-temperature and high-pressure environment in the cutting cavity.

[0037] The core sample is moved into the cutting cavity of the cutting cabin.

[0038] The cutting system is controlled to cut the core sample.

[0039] During the cutting process, the cutting system collects the tangential force data, feed resistance data, cutting torque data and cutting vibration data in real time, and dynamically adjusts the cutting rotation speed and feed speed according to the tangential force data, feed resistance data, cutting torque data and cutting vibration data.

[0040] At the same time, temperature change data and pressure change data are obtained during the cutting process, and the temperature and pressure in the cutting cavity are adjusted to remain stable according to the temperature change data and the pressure change data through the temperature and pressure control system.

[0041] After the cutting is completed, the cut core sample is taken out.

[0042] Compared with the prior art, the present application has the following advantages and technical effects: In use, the temperature and pressure control system is controlled to form a preset high-temperature and high-pressure environment in the cutting cavity, then the core sample is moved into the cutting cavity of the cutting cabin, the cutting system is controlled to cut the core sample, during the cutting process, the cutting system collects the tangential force data, feed resistance data, cutting torque data and cutting vibration data in real time, and dynamically adjusts the cutting rotation speed and feed speed according to the tangential force data, feed resistance data, cutting torque data and cutting vibration data, and after the cutting is completed, the cut core sample is taken out. Compared with the traditional technology, the present application can cut the core sample in a pseudo environment, facilitate the acquisition of true deep in-situ rock mechanical parameters, and verify the true deep rock mass mechanical behavior and law, and by dynamically adjusting the cutting rotation speed and feed speed through the tangential force data, feed resistance data, cutting torque data and cutting vibration data, the sample damage can be avoided, and the accuracy of the deep in-situ rock mechanical parameters is ensured. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the cutting system structure of the present invention; Figure 3 This is a schematic diagram of the structure of the diamond grinding wheel in this invention; Figure 4 This is a schematic diagram of the system connection structure of the present invention; Figure 5 This is a schematic diagram of the gate valve, test chamber, and core sampling chamber of the present invention; The components are as follows: 1. Left flange; 2. Cutting chamber; 3. Right flange; 4. Stud; 5. Nut; 6. Cutting system motor mounting plate; 7. Fixture motor mounting plate; 8. Blade motor mounting plate; 9. CNC hydraulic cylinder; 10. Blade servo motor; 11. Transmission gear set; 12. Fixture servo motor; 13. Water outlet; 14. Water inlet; 20. Piston rod; 21. Blade transmission rod; 22. Spline sleeve; 23. Converter; 24. Blade shaft; 25. Sample groove; 26. Fixture transmission rod; 27. Cylinder push plate; 28. Double blade structure; 29. ​​Fixture; 30. Fixture mounting plate; 31. Diamond grinding wheel; 41. Core sample; 42. High-pressure pump; 43. Mold temperature controller; 44. Cutting control cabinet; 45. Remote control system; 46. High-pressure pipeline; 47. First gate valve; 48. Second gate valve; 49. Test chamber; 50. Core sampling chamber. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Reference Figures 1 to 5 This invention discloses a rock cutting and preparation system for faithful reconstruction of deep in-situ environments, comprising: The cutting cabin 2 is provided with a cutting cavity.

[0047] The cutting system is arranged in the cutting cavity and is provided with a sensor group.

[0048] The temperature and pressure control system is in communication with the cutting cavity.

[0049] The control system is connected with the cutting system and the temperature and pressure control system.

[0050] The core sample 41 enters the cutting cavity from one side of the cutting cabin 2, the temperature and pressure control system is used to form a preset cutting fidelity environment in the cutting cavity, and the sensor group is used to collect the tangential force data, the feeding resistance data, the cutting torque data and the cutting vibration data in real time during the cutting process. The control system adjusts the cutting action of the cutting system according to the feedback data of the sensor group.

[0051] The control system adjusts the temperature and pressure compensation through the temperature and pressure control system according to the temperature disturbance and the pressure disturbance generated during the cutting process of the cutting system.

[0052] In use, the temperature and pressure control system is controlled to form a preset high-temperature and high-pressure environment in the cutting cavity, and then the core sample is moved into the cutting cavity of the cutting cabin, and the core sample is cut by the control cutting system. During the cutting process, the cutting system collects the tangential force data, the feeding resistance data, the cutting torque data and the cutting vibration data in real time, dynamically adjusts the cutting speed and the feed speed according to the tangential force data, the feeding resistance data, the cutting torque data and the cutting vibration data, and obtains the temperature change data and the pressure change data during the cutting process. According to the temperature change data and the pressure change data, the temperature and pressure in the cutting cavity are adjusted to remain stable through the temperature and pressure control system, and the cut core sample is taken out after the cutting is completed. Compared with the traditional technology, the core sample can be cut in the fidelity environment, the real deep in-situ rock mechanical parameters can be obtained, the real deep rock mass mechanical behavior and the law can be found out, and the sample damage can be avoided by dynamically adjusting the cutting speed and the feed speed according to the tangential force data, the feeding resistance data, the cutting torque data and the cutting vibration data, so that the accuracy of the deep in-situ rock mechanical parameters is ensured.

[0053] The control system includes a remote control system 45, which is electrically connected with the temperature and pressure control system and the cutting control cabinet 44, and the cutting control cabinet 44 is electrically connected with the cutting system.

[0054] As an optional implementation, the cutting cabin 2 is fixed with a left flange 1 and a right flange 3 at two ends respectively, and the cutting cabin 2, the left flange 1 and the right flange 3 are fixed through the cooperation of the stud 4 and the nut 5.

[0055] The cutting cavity is formed by the cutting cabin 2, the left flange 1 and the right flange 3.

[0056] The core sample 41 is located in the center of the cutting cabin 2, the left flange 1 and the right flange 3.

[0057] The core sample 41 is sealed with the left flange 1 and the right flange 3.

[0058] The fidelity cabin includes the left flange 1, the cutting cabin 2 and the right flange 3, and the cabin edge is provided with circular equidiameter through holes. The stud 4 passes through the above three parts and is locked by the nut 5 on both sides. The temperature and pressure control system is used to inject the medium with increased temperature and pressure into the cabin and continuously circulate, so that the water medium environment in the cabin reaches and maintains the stable pressure value and temperature value.

[0059] In order to ensure the sealing effect, the minimum pre-tightening force required by the stud 4 should meet: In the formula: is the minimum pre-tightening force of the stud. is the safety factor. is the tensile force borne by a single stud. is the pressure bearing area of the stud flange gasket. is the pressure of the water medium in the cabin. is the number of studs in the same section.

[0060] As an optional embodiment, the temperature and pressure control system includes: The high-pressure pump 42 is communicated with the water outlet 13 provided on the cutting cabin 2.

[0061] The mold temperature machine 43 is communicated with the other end of the high-pressure pump 42, and the other end of the mold temperature machine 43 is communicated with the water inlet 14 provided on the cutting cabin 2.

[0062] The high-pressure pump 42 and the mold temperature machine 43, the high-pressure pump 42 and the water outlet 13, and the mold temperature machine 43 and the water inlet 14 are communicated through the high-pressure pipeline 46.

[0063] The temperature and pressure control system includes the high-pressure pump, the high-pressure pipeline 46, the high-pressure pump 42 and the mold temperature machine 43. The high-pressure pump 42 is used to inject the water medium into the cutting cavity through the high-pressure pipeline 46 and form a circulation. The water medium pressure in the cabin is observed in real time. When the pressure begins to increase, the mold temperature machine 43 is started to heat the circulating water passing through the high-pressure pump 42. The water is continuously heated and pressurized by the high-pressure pump 42 and the mold temperature machine 43 and circulated, so that the temperature and pressure of the water in the cutting cabin 2 reach the target value and remain stable, and the temperature and pressure environment in the cabin is constructed.

[0064] In order to control the water medium pressure in the cabin to reach the target value and be stable, the pressure in the cabin should meet: wherein: wherein: P is the real-time value of the pressure in the cabin. P0 is the hydrostatic pressure of the deep rock in-situ environment. P1 is the additional pressure generated by the high-pressure pump. P2 is the additional pressure caused by the expansion of the water medium due to temperature rise. ρi is the rock density of the i-th layer of overburden in the deep in-situ environment. g is the acceleration of gravity. hi is the vertical thickness of the i-th layer of overburden in the deep in-situ environment. E is the bulk modulus of elasticity of the water medium. β is the bulk expansion coefficient of the water medium. T is the real-time temperature of the water medium. T0 is the initial temperature of the water medium. t is the real-time time of the temperature rise process.

[0065] As an optional embodiment, the cutting system comprises: a cutting part for cutting the core sample 41, the cutting part being arranged in the cutting cabin 2.

[0066] a feeding part in transmission cooperation with the cutting part through the oil cylinder push plate 27, the feeding part being used to move the cutting part closer to / away from the core sample 41.

[0067] a sample fixing part on which the core sample 41 is placed, the sample fixing part being used to fix the core sample 41.

[0068] As an optional embodiment, the cutting part comprises: a blade servo motor 10, the fixed end of which is fixedly connected to the outer wall of the cutting cabin 2.

[0069] a blade rotating shaft 24, one end of which is in transmission cooperation with the output shaft of the blade servo motor 10, and the other end of which is fixedly connected to a double-blade structure 28, the double-blade structure 28 being used to cut the core sample 41.

[0070] The blade rotating shaft 24 is provided with a torque sensor for acquiring the cutting torque and a vibration sensor for acquiring the cutting vibration.

[0071] The double-blade structure 28 comprises two diamond grinding wheels 31 in shaft cooperation with the blade rotating shaft 24, the two diamond grinding wheels 31 being arranged at intervals, and the interval between the two diamond grinding wheels 31 being 100 mm.

[0072] As an optional implementation, the fixed end of the blade servo motor 10 is fixed to the outer wall of the cutting cabin 2 through the blade motor fixing plate 8, one end of the output shaft of the blade servo motor 10 is connected with the transmission gear set 11, the other end of the transmission gear set 11 is connected with the blade transmission rod 21, one end of the blade transmission rod 21 is vertically slidingly connected with the spline sleeve 22, the blade transmission rod 21 is radially limited with the spline sleeve 22, the other end of the spline sleeve 22 is connected with the input shaft of the converter 23, and the output shaft of the converter 23 is connected with the blade rotating shaft 24.

[0073] The converter 23 is used for converting the rotation of the vertically arranged spline sleeve 22 into the rotation of the horizontally arranged blade rotating shaft 24.

[0074] The shell of the converter 23 is fixed on the oil cylinder push plate 27.

[0075] The blade rotating shaft 24 is rotationally arranged at the bottom of the oil cylinder push plate 27.

[0076] The converter 23 is a shell and a bevel gear set rotationally arranged in the shell, and includes two bevel gears meshed and arranged at 90°.

[0077] The transmission gear set 11 includes two gears meshed with each other, one of which is connected with the output shaft of the blade servo motor 10, and the other of which is connected with the piston rod 20, the two gears are meshed, and the two gears are rotationally arranged on the cutting cabin 2.

[0078] As an optional implementation, the feeding part includes: The numerical control hydraulic oil cylinder 9 has a fixed end fixed to the outer wall of the cutting cabin 2 through the cutting system motor fixing plate 6, and one end of the piston rod 20 is connected with the numerical control hydraulic oil cylinder 9, the fixed end of the piston rod 20 is fixed in the cutting cabin 2, and the movable end of the piston rod 20 is fixed with the oil cylinder push plate 27.

[0079] The movable end of the piston rod 20 is provided with a first force sensor for collecting feeding resistance.

[0080] As an optional implementation, the sample fixing part includes: The clamp servo motor 12 has a fixed end fixed to the outer wall of the cutting cabin 2 through the clamp motor fixing plate 7, and one end of the clamp transmission rod 26 is connected with the output shaft of the clamp servo motor 12.

[0081] The clamp fixing plate 30 is fixed in the cutting cabin 2, the clamp 29 and the sample groove 25 are connected on the clamp fixing plate 30, the clamp 29 and the sample groove 25 are correspondingly arranged, and the clamp 29 is in transmission connection with the clamp transmission rod 26.

[0082] A second force sensor for collecting tangential force is arranged between the bottom of the clamp fixing plate 30 and the inner wall of the cutting cabin 2.

[0083] The clamp 29 includes two clamping heads slidingly arranged on the clamp fixing plate 30, and a bidirectional threaded rod screwing with the two clamping heads, the bidirectional threaded rod being shaft-connected with the other end of the clamp transmission rod 26, and the bidirectional threaded rod rotating to make the two clamping heads approach or move away from each other.

[0084] The cutting system is composed of the numerical control hydraulic cylinder 9, the blade servo motor 10 and the clamp servo motor 12 installed on the outer wall of the cutting cabin 2, and the rotating sealing structure in the pressing plate transmits the thrust and torque to the cutting cabin 2, and ensures the stability of the in-situ environment while cutting. The connecting parts include the cutting system motor fixing plate 6, the clamp motor fixing plate 7, the blade motor fixing plate 8, the transmission gear set 11, etc., which provide a flat installation basis for the cutting system installation on the uneven wall of the cutting cabin 2.

[0085] In order to ensure the smooth progress of the cylinder pushing and the blade cutting, the maximum theoretical thrust generated by the numerical control hydraulic cylinder 9 should meet: In the formula: is the maximum theoretical thrust of the hydraulic system. is the efficiency of the hydraulic machine. is the working pressure of the hydraulic system. is the effective area of the cylinder piston. is the piston diameter.

[0086] The torque provided by the blade servo motor 10 should meet: In the formula: is the blade torque. is the tangential force of the blade. is the radius of the blade. is the cutting power of the blade. is the linear speed of the blade.

[0087] Further, the cutting system further includes a double-blade structure 28, a transmission system, a power system and a fixing plate.

[0088] The double-blade structure 28 consists of two diamond grinding wheels 31 with a blade spacing of 100mm, fixed to the blade shaft 24. The transmission system includes a piston rod 20, a transmission gear set 11, a blade transmission rod 21, a spline sleeve 22, a converter 23, and a clamping transmission rod 26. A CNC hydraulic cylinder 9 controls the extension and retraction of the piston rod 20, thereby driving the cylinder push plate 27 and the double-blade structure 28, spline sleeve 22, and converter 23 connected to the push plate, realizing the feed and retraction control of the cutting mechanism. The torque generated by the blade servo motor 10 is transmitted sequentially to the blade transmission rod 21, spline sleeve 22, and converter 23 through the transmission gear set 11, realizing the vertical displacement and steering of the transmission system, driving the double-blade structure 28 to perform cutting work. The torque generated by the clamping servo motor 12 is transmitted to the clamping thread through the clamping transmission rod 26, realizing the clamping and releasing of the clamp.

[0089] To ensure that clamp 29 can clamp the core sample 41, the applied torque should meet the following requirements: In the formula: This refers to the clamping torque. This refers to the axial component of the force during the double-blade cutting process. The radius of the clamping force is the radius of action. The friction coefficient between the clamp and the surface of the core sample is given.

[0090] The cutting system is also equipped with a force feedback sensor monitoring system.

[0091] The force feedback sensor monitoring system includes a second force sensor and a first force sensor, configured to measure the tangential force during the cutting process in real time. Feed resistance A torque sensor mounted on the blade shaft 24 is configured to measure the cutting torque T in real time. A vibration sensor mounted on the blade shaft 24 is configured to monitor the cutting vibration a in real time.

[0092] Among them, tangential force Opposite to the rotation direction of the diamond grinding wheel 31, it is used to overcome the shear strength of the rock core and is a core parameter for calculating cutting power and adjusting rotation speed, directly related to feed rate and cutting height. In the formula: This represents the shear strength of the rock. This is the arc length of the contact between the blade and the rock core. This is the feed rate. The main spindle speed. , These are the blade radius and the core radius, respectively. This is the cutting height.

[0093] Feed resistance The degree of contact between the blade and the rock is directly reflected in the direction of the diamond wheel 31, which is an important parameter for adjusting the feed rate, which is proportional to the feed rate and inversely proportional to the spindle speed : In the formula: is the unit feed resistance, which represents the feed direction force required to cut a unit surface of rock, and is determined by the properties of the rock and the degree of blade wear. is the blade width.

[0094] Since the tangential force and the feed resistance have a certain proportional relationship, and the size is determined by the properties of the rock itself and the cutting process: In the formula: is the shear strength of the rock. is the contact arc length of the blade and the core. is the unit feed resistance. is the blade width.

[0095] The blade wear condition is detected by detecting the cutting force ratio-time curve.

[0096] As an optional implementation, one end of the left flange 1 is fixed and connected to one end of the first gate valve 47, the other end of the first gate valve 47 is fixed and connected to the coring cabin 50 for placing the core sample 41, one end of the right flange 3 is fixed and connected to one end of the second gate valve 48, the other end of the second gate valve 48 is connected to the test cabin 49 for taking out the cut core sample 41.

[0097] The coring cabin 50, the first gate valve 47, the second gate valve 48, and the test cabin 49 are connected with the cutting cabin 2, and the temperature and pressure of the core sample 41 in the cabin body under the fidelity condition are consistent with the in-situ environment of the deep rock, and are transferred from the coring cabin 50 to the cutting cabin 2 to complete the complete cutting preparation operation.

[0098] A rock cutting method for deep in-situ environment fidelity reconstruction, using the above-mentioned rock cutting preparation system for deep in-situ environment fidelity reconstruction, comprising the following steps: Control the temperature and pressure control system to form a preset high temperature and high pressure environment in the cutting cavity.

[0099] Move the core sample 41 into the cutting cavity of the cutting cabin 2.

[0100] Control the cutting system to cut the core sample 41.

[0101] During the cutting process, the cutting system collects the tangential force data, the feed resistance data, the cutting torque data and the cutting vibration data in real time, and dynamically adjusts the cutting rotation speed and the feed rate according to the tangential force data, the feed resistance data, the cutting torque data and the cutting vibration data.

[0102] Meanwhile, the temperature change data and the pressure change data are obtained during the cutting process, and the temperature and the pressure in the cutting cavity are adjusted to remain stable according to the temperature change data and the pressure change data through the temperature and pressure control system.

[0103] After the cutting is completed, the cut core sample 41 is taken out.

[0104] As an additional embodiment, the step of dynamically adjusting the cutting rotation speed and the feed rate according to the tangential force data, the feed resistance data, the cutting torque data and the cutting vibration data includes: The cutting rotation speed and the feed rate are automatically adjusted by a PID algorithm.

[0105] As an additional embodiment, the step of automatically adjusting the cutting rotation speed and the feed rate by the PID algorithm includes: The tangential force data, the feed resistance data, the cutting torque data, the cutting vibration data and the spindle rotation speed are obtained.

[0106] The cutting vibration data is the vibration acceleration of the spindle.

[0107] The cutting vibration data is compared with a preset safety threshold.

[0108] When the cutting vibration data exceeds the preset safety threshold range, the feed rate and the cutting rotation speed are immediately reduced at the same time.

[0109] When the cutting vibration data is within the preset safety threshold range, the adaptive stable cutting step is performed.

[0110] Firstly, the cutting control cabinet 44 receives the tangential force data , the feed resistance data , the spindle torque data , the vibration acceleration data and the spindle rotation speed data collected by the force feedback sensor during the cutting process. Then, the vibration acceleration is judged in the safety intervention module. If the vibration acceleration exceeds the safety threshold, the emergency intervention is triggered, and the feed rate and the rotation speed are immediately reduced at the same time until the vibration disappears. Otherwise, the force-based adaptive PID module is entered.

[0111] As an additional embodiment, the adaptive stable cutting step includes: Firstly, constant force control is performed to make the feeding resistance approach the preset value . The adaptive PID formula is as follows: wherein, is the instruction feeding speed output after the controller calculation. is the current feeding speed. is the adjustment amount of the feeding speed, which is obtained by adding the three terms of the PID controller, i.e. the proportional term, the integral term and the differential term. is the error of the feeding resistance, which is the difference between the target feeding resistance and the current measured feeding resistance . is the target feeding resistance. is the measured feeding resistance at time t. is the proportional gain. is the integral gain. is the differential gain.

[0112] When the feeding resistance is stable around the target value, the efficiency optimization stage is entered, and the feeding speed and the spindle speed are fine-tuned to maximize the cutting efficiency.

[0113] As an additional embodiment, the step of adjusting the temperature and pressure in the cutting cavity to keep them stable according to the temperature change data and the pressure change data through the temperature and pressure control system comprises: automatically adjusting the temperature and pressure in the cutting cavity through the PID algorithm.

[0114] As an additional embodiment, the step of automatically adjusting the temperature and pressure in the cutting cavity through the PID algorithm comprises: quantifying the temperature and pressure disturbances generated in the cutting process to obtain the actual temperature deviation value and the actual pressure deviation value.

[0115] calculating the temperature compensation amount and the pressure compensation amount through the PID algorithm according to the actual temperature deviation value and the actual pressure deviation value.

[0116] adjusting the mold temperature machine parameters and the high-pressure pump parameters according to the temperature compensation amount and the pressure compensation amount to offset the disturbances and maintain the temperature and pressure in the cutting cavity stable.

[0117] During the cutting process, the diamond wheel rotates at high speed and rubs and impacts the core, which will cause two types of disturbances to the cutting cavity circulating water medium: pressure disturbance: including the instantaneous pressure fluctuation caused by cutting impact and the pressure drift caused by volume change. Temperature disturbance: mainly the local temperature rise caused by frictional heating. The system needs to quantify the size of these two types of disturbances through formulas first, and then calculate the pressure compensation and temperature compensation, and through PID dynamic control, so that the real-time value of the pressure and temperature in the cabin always tends to approach the target value set, and maintain the "fidelity environment" of the cabin pressure and temperature.

[0118] As an additional embodiment, the step of obtaining the actual pressure deviation value comprises: calculating the total pressure disturbance value of the cutting process of the diamond wheel.

[0119] calculating the pressure drift value in the cabin.

[0120] obtaining the actual pressure deviation value according to the functional relationship of the actual pressure deviation value, the total pressure disturbance value and the pressure drift value.

[0121] wherein the total pressure disturbance value of the cutting process of the diamond wheel is calculated . It can be quantified by the following formula: In the formula, is the deionized water density. is the cutting area flow rate, which is determined by the high-pressure pump circulating system. is the flow rate change caused by cutting disturbance. is the impact additional pressure generated during the contact process of the blade and the core.

[0122] During the cutting process, the diamond wheel rotates at high speed and feeds downward, and rubs and impacts the core sample, which will cause instantaneous extrusion and disturbance to the surrounding circulating water medium. This disturbance will cause a sudden change in the local water medium flow rate, and then cause the cabin pressure to fluctuate.

[0123] wherein obtaining the impact additional pressure ( ) comprises the following steps: combining the tangential force sensor data to calculate: , and the impact area ( ) = the contact arc length of the diamond wheel and the core ( ) x the width of the diamond wheel ( ), that is: It can be calculated by the radius of the diamond wheel , the radius of the core , and the cutting depth : . ​Real-time acquisition by the second force sensor).

[0124] Wherein, in the step of calculating the pressure drift in the cabin, the pressure drift is caused by the core sample debris generated in the cutting process of the grinding wheel. During the cutting process, core debris will be generated, and part of the debris will flow with the water medium circulation, causing a slight change in the effective medium volume in the cabin. At the same time, the grinding wheel feeding will occupy a certain cabin space, which will also change the medium volume. According to the Boyle's law, which is approximately applicable under high temperature and high pressure, the volume change will cause the pressure drift, and the pressure drift can be calculated by the following formula: Wherein, is the real-time value of the pressure in the cabin, is the target value of the pressure maintained stable in the cabin, . is the change amount of the effective volume of the water in the cabin, including the expanded volume of the debris and the volume occupied by the grinding wheel feeding , is the total volume of the water in the cabin.

[0125] Calculate the actual pressure deviation value of the cutting cabin , through the actual pressure deviation = total disturbance - allowable error, that is: Wherein is the allowable error of the in-situ pressure, which is usually set to ±0.5 MPa and is determined by the system itself. If the calculation result is positive, it means that the pressure is too high, and the working power of the high-pressure pump needs to be reduced to reduce the pressure in the cabin. If the calculation result is negative, the working power of the high-pressure pump needs to be increased to increase the pressure in the cabin.

[0126] As an additional implementation, the step of obtaining the pressure compensation amount includes: Calculating the compensation output power of the high-pressure pump through the PID algorithm The control system needs to compensate the amount according to the total disturbance of the pressure , substitute it into the pressure PID control formula, calculate the output power of the high-pressure pump that needs to be adjusted , realize accurate pressurization / depressurization, so as to offset the actual pressure deviation value in the cabin , and realize the stability of the pressure in the cabin.

[0127] Wherein: In the formula: is the pressurizing pump power of the PID controller. / / P / I / D coefficient for pressure control. Pressure error of water medium in the cabin. Pressure target value of water medium in the cabin. Real-time value of pressure of water medium in the cabin.

[0128] As an additional embodiment, the step of adjusting the high-pressure pump parameters according to the pressure compensation amount to offset the pressure disturbance includes: The control system will calculate the high-pressure pump compensation power Sent to the high-pressure pump to adjust its output: if (Low pressure): Increase the high-pressure pump power, increase the water medium injection amount, and increase the cutting cabin pressure. If (High pressure): Reduce the high-pressure pump power to reduce the pressure.

[0129] As an additional embodiment, the step of obtaining the actual temperature deviation value includes: Identify the source of temperature disturbance and quantify the temperature difference with the formula.

[0130] The temperature difference is mainly from two sources. Part of it is when the diamond grinding wheel and the rock core sample are cut, a large amount of mechanical energy is converted into heat energy, and due to the local hysteresis of the water medium circulation, the heat cannot be immediately dispersed, causing the temperature in the cutting affected area to rise instantaneously, and the heat generated is: In the formula, is the thermal energy conversion efficiency of the grinding wheel cutting process. is the cutting power, . Another part is the heat dissipation of the cabin itself: In the formula, is the heat transfer coefficient, is the effective outer surface area of the cabin heat dissipation, is the real-time value of the temperature inside the cabin, is the temperature of the external heat dissipation environment.

[0131] The high-pressure pump needs to be based on the effective heating of the cabin Should meet: .

[0132] As an additional embodiment, the step of obtaining the temperature compensation amount by PID algorithm calculation includes: The control system substitutes the specific values of cutting heat generation and cabin heat dissipation into the temperature PID control formula to calculate the heating power that the temperature control machine needs to adjust , realize accurate temperature rise / fall, so as to offset the temperature difference in the point cabin body, realize the stability of the temperature value of the cabin body: Wherein: In the formula: The heating power of the PID controller. / / The temperature control P / I / D coefficient. The temperature error. The temperature target value.

[0133] As an additional embodiment, the step of adjusting the parameters of the mold temperature machine according to the temperature compensation amount comprises: The control system sends the mold temperature machine compensation power To the mold temperature machine, adjusts its heating output: if (Temperature is low): increase the mold temperature machine heating power, increase the circulating water temperature. If (Temperature is high): reduce the mold temperature machine heating power, reduce the temperature.

[0134] The working process of the core sample 41 cutting preparation system under the deep in-situ reconstruction environment is: First, connect the left flange 1 with the coring cabin 50 through the first gate valve 47, and connect the right flange 3 with the test cabin 49 through the second gate valve 48. Close the first gate valve 47, open the second gate valve 48. Start the remote control system 45, use the high-pressure pump 42 to inject water medium into the cutting cabin 2 through the high-pressure pipeline 46 and form a circulation. Observe the pressure in the cabin through the remote control system 45, and when the pressure starts to increase, start the mold temperature machine 43 to construct the temperature and pressure environment in the cabin. The remote control system 45 controls the dynamic temperature and pressure environment in the cabin through PID.

[0135] Second, when the temperature and pressure in the cutting cabin 2 reach the target value, that is, consistent with the deep in-situ environment of the core sample 41, at this time the temperature and pressure in the coring cabin 50 are also the value and remain stable, open the first gate valve 47 to connect the coring cabin 50 with the cutting cabin 2, and transfer the core sample 41 from the coring cabin 50 to the target position in the cutting cabin 2 for cutting. The coring cabin 50 stores the core sample 41 taken from the deep in-situ environment of the rock, and the temperature and pressure values in the coring cabin 50 are consistent with the deep in-situ environment.

[0136] Third step, the cutting control cabinet 44 is controlled by the remote control system 45, the target torque of the clamp 29 is set to clamp the core sample 41, then the inner spacing of the two blades of the double-blade structure 28, the feed speed of the diamond grinding wheel 31, the vertical moving speed, and the rotating speed are set. The cutting mechanism is started, the diamond grinding wheel 31 is controlled to rotate at high speed, and the position of the diamond grinding wheel 31 is lowered at a constant feed speed until the diamond grinding wheel 31 contacts the upper surface of the core sample 41. Then the rotating speed of the diamond grinding wheel 31 and the feed speed of the diamond grinding wheel 31 are controlled, the diamond grinding wheel 31 rotating at high speed is used to cut the core sample 41 until the diamond grinding wheel 31 penetrates the lower surface of the core sample 41, so that the core sample 41 is finely cut, and the core sample 41 with a target size is prepared, that is, the inner spacing of the two blades of the diamond grinding wheel.

[0137] Fourth step, after cutting, the diamond grinding wheel 31 is slowly lifted and separated from the prepared core sample 41, and the remaining core is pushed into the test cabin 49 in a fidelity environment and sealed to further carry out mechanical loading test.

[0138] In the embodiment, first, the cabin body of the system needs to be sealed and connected and the initial environment is constructed. Preferably, before starting the cutting operation, the operator or the remote control system 45 automatically performs the steps of abutting the left flange 1 of the cutting cabin 2 with the coring cabin 50, and establishing a controllable communication pipeline through the first gate valve 47. The right flange 3 of the cutting cabin 2 is flange-connected with the second gate valve 48, and another controllable communication pipeline is established through the second gate valve 48. In the mechanical connection step in the fidelity cabin body, it is necessary to ensure that all flange gaskets are installed in place, and the pre-tightening force of the stud 4 meets the design requirements, so as to ensure that no leakage occurs during subsequent pressurization.

[0139] Subsequently, the first gate valve 47 between the cutting cabin 2 and the coring cabin 50 is closed to separate the two cabins. At the same time, the second gate valve 48 between the cutting cabin 2 and the test cabin 49 is opened to form a smooth pipeline loop when the cutting cabin 2 is injected and circulated with the medium.

[0140] After the cabin pipeline connection is completed, the remote control system 45 sends a command to start the high-pressure pump 42, so that the deionized water or pure water medium is injected into the cutting cabin 2 through the high-pressure pipeline 46 to form a circulating flow. Preferably, the circulating water medium adopts seamless steel pipe or metal hose between the water outlet of the high-pressure pump 42 and the cabin body, so as to ensure that the system does not deform or leak within the working range.

[0141] In the initial stage after the cycle is established, the remote control system 45 will monitor the real-time data of the cabin pressure sensor, and when the cabin pressure curve is detected to rise and approach the initial steady state, the system automatically issues a command to start the mold temperature machine 43 to heat the circulating medium, thereby gradually increasing the temperature inside the cutting cabin 2 to the set range. The whole temperature and pressure adjustment process is closed-loop adjusted by the remote control system using the PID algorithm to achieve precise control of the dynamic temperature and pressure conditions, thereby constructing a "fidelity" temperature and pressure condition equivalent to the deep in-situ rock environment.

[0142] The communication between the coring cabin 50 and the cutting cabin 2 and the transfer of the core. When the temperature and pressure in the cutting cabin 2 reach the pre-set target value after being monitored and adjusted by the system, the target value is preferably consistent with the temperature and pressure parameters measured in the deep underground in-situ environment of the core sample 41 to be prepared. At this time, since the coring cabin 50 and the cutting cabin 2 are structurally sealed and connected by flanges and pipelines, and the temperature and pressure of the two cabins are maintained at the same value by separate pressure and temperature control devices at the initial stage, the medium impact and temperature and pressure fluctuations when the cabin is connected can be avoided. After the valve is fully opened, the internal space of the coring cabin 50 and the cutting cabin 2 is connected, and at this time, the core sample 41 is gradually transferred from the coring cabin 50 to the positioning position on the working platform of the double-blade structure 28 in the cutting cabin 2.

[0143] The core sample 41 here is a real core directly taken from the deep rock in-situ environment, and since the whole process from coring to transfer is carried out in a sealed fidelity cabin, the physical state is not damaged, thereby providing a basis for the authenticity of the subsequent cutting and testing.

[0144] Setting of the working parameters of the cutting mechanism and the cutting process. After the core sample 41 is transferred to the specified position in the cutting cabin 2, the operator calls the operation interface of the cutting control cabinet 44 through the remote control system 45, and sets the target clamping torque of the clamp 29 in sequence, so that the clamp 29 applies sufficient pre-tightening force to the core sample 41 to prevent displacement or vibration during the cutting process. The target torque value can be calculated and determined according to the size, material and cutting force of the core sample 41.

[0145] Then, the inner spacing of the double-blade structure 28 is set, and the spacing value directly determines the length accuracy of the core sample 41 after cutting. The feed rate of the diamond grinding wheel 31 in the cutting process, i.e. the vertical movement speed and the rotation speed, is set. Preferably, a higher feed rate is used in the initial contact stage to improve the processing efficiency, and after the cutter contacts the sample surface, it is automatically switched to a lower constant feed rate to obtain a more stable cutting process. The rotation speed is selected according to the hardness of the core and the diameter of the cutter.

[0146] After the cutting mechanism is started, the system first drives the diamond grinding wheel 31 to rotate at high speed, and controls it to move downward at a constant feed rate set in advance. When it is detected that the diamond grinding wheel 31 contacts the upper surface of the core sample 41, the system automatically adjusts the feed rate to a preset low-speed cutting mode. During the entire cutting process, the rotation speed is kept constant and the feed rate is constant, and the cutting force and the position of the cutter are fed back to the control system through the force sensor and the displacement sensor, so that the system can automatically take measures to slow down or pause when abnormal resistance or vibration occurs. Finally, the double-piece diamond grinding wheel 31 completely penetrates the core sample 41 until the lower surface is cut, so that the core sample 41 with a length equal to the inner spacing of the two blades is obtained, and the cut is smooth and the structural integrity of the sample in the original position is maintained.

[0147] After cutting, the sample is taken out and transferred to the test cabin 49. After cutting is completed, the system controls the diamond grinding wheel 31 to slowly lift at a predetermined speed until the blade is completely separated from the surface of the sample, preventing water flow disturbance or mechanical impact from damaging the sample due to rapid lifting of the blade. At this time, the core sample 41 that has completed cutting is sent from the original position to the test cabin 49.

[0148] On the transfer path, the temperature and pressure environment in the cabin remains unchanged, and the second gate valve 48 remains open to ensure that the medium state between the cutting cabin 2 and the test cabin 49 is continuous and consistent. After the sample enters the test cabin 49, the second gate valve 48 is immediately operated to close, realizing the independent sealing of the test cabin 49. At this time, the test cabin 49 still maintains the same deep in-situ temperature and pressure conditions as the cutting cabin 2, and the core sample 41 can directly carry out subsequent physical and mechanical experiments such as mechanical loading, permeability test, and acoustic wave test in the test cabin 49. The entire sampling, processing, and testing process does not destroy the in-situ environmental conditions, and realizes the true sense of fidelity sample preparation and testing process.

[0149] It should be noted that in the connection of the auxiliary mechanism and the fidelity cabin, the sample transfer, clamping and cutting and other operations, it is inevitable to produce additional interference to the high pressure water in the cutting cabin 2. The interference is usually manifested as the instantaneous change of the water medium pressure and temperature in the cabin. In view of the problem, the present application is monitored and adjusted in real time by the remote control system 45 arranged in the main body of the system. The remote control system 45 integrates the temperature and pressure adjusting units such as the high pressure pump 42 and the mold temperature machine 43, and forms a water circulation loop with the high pressure pipeline 46. When the actual pressure of the water medium in the cutting cabin 2 is lower than the target value, the remote control system 45 will automatically adjust the output of the high pressure pump 42, supplement the pressure medium to the cutting cabin 2 through the high pressure pipeline 46 and form a circulation to restore the pressure in the cabin to the set level. When the temperature is lower than the target value, the mold temperature machine 43 is instructed to heat the circulating water medium to gradually approach and stabilize the required range. If the temperature is too high, the medium temperature can be lowered by reducing the heating power or even switching to the cooling mode. The above control process is continuously executed, that is, the high pressure pump 42 and the mold temperature machine 43 are alternately or cooperatively operated, and the water medium is continuously circulated between the pipeline, the pump body, the mold temperature machine and the cutting cabin. By means of the heat conduction and pressure transmission characteristics of the medium, real-time two-way adjustment and dynamic stability control of temperature and pressure are realized, so that the temperature and pressure in the cutting cabin 2 are accurately maintained at the preset target value for a long time, and are consistent with the in-situ environmental parameters of the simulated deep core, thereby ensuring the fidelity of the processing environment.

[0150] At the same time, since the above operations are carried out in a high temperature and high pressure environment, manual intervention is not only difficult to achieve, but also has high risk, therefore the present application specially designs an unmanned and automatic control scheme for the whole process. All links related to valve operation, hydraulic drive, temperature and pressure adjustment, motor control and state monitoring are managed and automatically executed by the remote control system, and the operator can monitor and set parameters in the safe area through the control terminal without directly entering the high temperature and high pressure environment, thereby fundamentally eliminating the personal safety hazards in the operation process. At the same time, the fully automatic control mode also significantly improves the work efficiency and adjustment accuracy, ensures that the environmental parameters of the sample in the processing process are always in an ideal state, and provides stable and repeatable environmental conditions for subsequent experiments and research.

[0151] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0152] The above-described embodiments are merely intended to describe the preferred modes of the present application, and are not intended to limit the scope of the present application. Various modifications and improvements of the present application made by those skilled in the art, without departing from the design spirit of the present application, shall fall within the scope of the present application as defined by the claims.

Claims

1. A rock cutting preparation system for deep in-situ environment-faithful reconstruction, characterized in that, The application relates to a cutting cabin for rock core samples. The cutting cabin (2) is provided with a cutting cavity; A cutting system is arranged in the cutting cavity, and the cutting system is provided with a sensor group; A temperature and pressure control system is in communication with the cutting cavity; A control system is connected with the cutting system and the temperature and pressure control system; A rock core sample (41) is arranged in the cutting cavity from one side of the cutting cabin (2), and the temperature and pressure control system is used to form a preset cutting fidelity environment in the cutting cavity; when the rock core sample (41) is cut, the sensor group is used to collect cutting tangential force data, feeding resistance data, cutting torque data and cutting vibration data in real time; and the control system adjusts the cutting action of the cutting system according to the feedback data of the sensor group; The control system adjusts the temperature and pressure compensation of the temperature and pressure control system according to the temperature disturbance and pressure disturbance generated in the cutting process of the cutting system.

2. The deep in situ environment-faithful reconstruction rock cutting fabrication system of claim 1, wherein, The cutting cabin (2) is fixed with a left flange (1) and a right flange (3) at two ends respectively, and the cutting cabin (2), the left flange (1) and the right flange (3) are fixed through cooperation of studs (4) and nuts (5); The cutting cavity is formed by the cutting cabin (2), the left flange (1) and the right flange (3); The rock core sample (41) penetrates the center of the cutting cabin (2), the left flange (1) and the right flange (3); The rock core sample (41) is in sealing cooperation with the left flange (1) and the right flange (3).

3. The deep in situ environment-faithful reconstruction rock cutting fabrication system of claim 1, wherein, The temperature and pressure control system comprises: A high-pressure pump (42) is in communication with a water outlet (13) arranged on the cutting cabin (2) at one end; A mold temperature machine (43) is in communication with the other end of the high-pressure pump (42) at one end, and the other end of the mold temperature machine (43) is in communication with a water inlet (14) arranged on the cutting cabin (2); The high-pressure pump (42), the mold temperature machine (43), the high-pressure pump (42) and the water outlet (13) and the mold temperature machine (43) and the water inlet (14) are all in communication through high-pressure pipelines (46).

4. The deep in situ environment-faithful reconstruction rock cutting fabrication system of claim 1, wherein, The cutting system comprises: A cutting part is used for cutting the rock core sample (41), and the cutting part is arranged in the cutting cabin (2); A feeding part is in transmission cooperation with the cutting part through an oil cylinder push plate (27), and the feeding part is used for making the cutting part close to or away from the rock core sample (41); A sample fixing part is used for fixing the rock core sample (41).

5. The deep in situ environment-faithful reconstruction rock cutting fabrication system of claim 4, wherein, The cutting part comprises: A blade servo motor (10) is fixedly connected with the outer wall of the cutting cabin (2) at a fixed end; A blade rotating shaft (24) is in transmission cooperation with the output shaft of the blade servo motor (10) at one end, and the other end of the blade rotating shaft (24) is fixed with a double-blade structure (28) used for cutting the rock core sample (41); The blade rotating shaft (24) is provided with a torque sensor used for acquiring the cutting torque and a vibration sensor used for acquiring the cutting vibration.

6. The deep in situ environment-faithful reconstruction rock cutting fabrication system of claim 5, wherein, The fixed end of the blade servo motor (10) is fixed to the outer wall of the cutting cabin (2) through a blade motor fixing plate (8), one end of the output shaft of the blade servo motor (10) is connected with a transmission gear set (11), the other end of the transmission gear set (11) is connected with a blade transmission rod (21), one end of the blade transmission rod (21) is vertically slidingly connected with a spline sleeve (22), the blade transmission rod (21) is radially limited with the spline sleeve (22), the other end of the spline sleeve (22) is connected with the input shaft of a converter (23), and the output shaft of the converter (23) is connected with the blade rotating shaft (24); The converter (23) is used for converting the rotation of the vertically arranged spline sleeve (22) into the rotation of the horizontally arranged blade rotating shaft (24); The shell of the converter (23) is fixed on the oil cylinder push plate (27); The blade rotating shaft (24) is rotationally arranged at the bottom of the oil cylinder push plate (27).

7. The deep in situ environment-faithful reconstruction rock cutting fabrication system of claim 1, wherein, The feeding part comprises: A numerical control hydraulic oil cylinder (9) is fixed to the outer wall of the cutting cabin (2) through a cutting system motor fixing plate (6), one end of the numerical control hydraulic oil cylinder (9) is connected with a piston rod (20), the fixed end of the piston rod (20) is fixed in the cutting cabin (2), and the movable end of the piston rod (20) is fixed with the oil cylinder push plate (27). The movable end of the piston rod (20) is provided with a first force sensor for collecting the feeding resistance.

8. The deep in situ environment-faithful reconstruction rock cutting fabrication system of claim 1, wherein, The sample fixing part comprises: A clamp servo motor (12) is fixed to the outer wall of the cutting cabin (2) through a clamp motor fixing plate (7), and one end of the output shaft of the clamp servo motor (12) is connected with a clamp transmission rod (26); A clamp fixing plate (30) is fixed in the cutting cabin (2), the clamp fixing plate (30) is connected with a clamp (29) and a sample groove (25), the clamp (29) and the sample groove (25) are arranged correspondingly, and the clamp (29) is in transmission connection with the clamp transmission rod (26); A second force sensor is arranged between the bottom of the clamp fixing plate (30) and the inner wall of the cutting cabin (2) for collecting the tangential force.

9. The deep in situ environment-faithful reconstruction rock cutting fabrication system of claim 2, wherein: One end of the left flange (1) is fixed and connected with one end of a first gate valve (47), the other end of the first gate valve (47) is fixed and connected with a coring cabin (50), the coring cabin (50) is used for placing the rock core sample (41), one end of the right flange (3) is fixed and connected with one end of a second gate valve (48), the other end of the second gate valve (48) is connected with a test cabin (49), and the test cabin (49) is used for taking out the rock core sample (41) after cutting.

10. A method of deep in-situ environment-fidelity reconstructed rock cutting using the deep in-situ environment-fidelity reconstructed rock cutting preparation system of any one of claims 1-9, wherein, The method comprises the following steps: Controlling the temperature and pressure control system to form a preset high-temperature and high-pressure environment in the cutting cavity; Moving the rock core sample (41) into the cutting cavity of the cutting cabin (2); Controlling the cutting system to cut the rock core sample (41); Controlling the cutting system to cut the rock core sample (41). During the cutting process, the cutting system collects the tangential force data, the feed resistance data, the cutting torque data and the cutting vibration data in real time, and dynamically adjusts the cutting rotation speed and the feed speed according to the tangential force data, the feed resistance data, the cutting torque data and the cutting vibration data; Meanwhile, the temperature change data and the pressure change data are obtained during the cutting process, and the temperature and pressure in the cutting cavity are adjusted to remain stable according to the temperature change data and the pressure change data and through the temperature and pressure control system; After the cutting is completed, the cut rock core sample (41) is taken out.

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