Experimental device and method for cutting rock by combining triaxial stress loading with abrasive jet

Abstract

The embodiment of the invention provides an experimental device for cutting rock by combining triaxial stress loading with abrasive jet and a method thereof, the experimental device comprises a frame, a triaxial stress loading system and an abrasive jet cutting system, a rock sample is fixed in the frame; the triaxial stress loading system is controlled to apply stress in X / Y / Z different plane directions to the rock sample in the frame at the same time so as to truly simulate the real stress condition of the shaft bottom rock in the mining process; the abrasive jet cutting system is controlled to jet abrasive to the rock sample to cut the rock sample, and then the influence of the abrasive jet rock breaking technology on the rock at the bottom of the well in the mining and tunnel construction processes is simulated. Through the triaxial stress loading system and the abrasive jet cutting system, the influence rule of the crustal stress in the X / Y / Z directions on the jet rock breaking efficiency can be analyzed by actually simulating the real stress condition of the well bottom rock in the drilling process, and an indoor experiment research means is provided for application of the high-pressure jet drilling technology.

Description

Technical Field

[0001] The present invention relates to the technical field of abrasive water jet rock breaking, and particularly to an experimental device and method for triaxial stress loading combined with abrasive jet cutting of rocks. Background Art

[0002] The abrasive jet rock breaking technology is mainly used in fields such as mine exploitation and tunnel construction. It cuts and breaks rocks by high-pressure jetting of a fluid mixed with abrasives. Compared with traditional blasting and mechanical breaking methods, the abrasive jet rock breaking technology has the advantages of less environmental impact, precise control, and high working efficiency. Currently, the relevant scientific research mainly includes three methods: theoretical analysis, numerical calculation, and physical model simulation tests. Since rock masses are anisotropic, inhomogeneous, and discontinuous materials, and the in-situ stress environment in which rock masses occur is complex and variable, the mechanical parameters and stress environment of rock masses have great uncertainties, making it difficult to determine the rock mass parameters and boundary conditions required by the theoretical analysis and numerical calculation methods. Physical model simulation tests can use real rock specimens (or physically similar simulation materials) for scientific experiments, which can intuitively reflect the failure and deformation processes of tunnel surrounding rocks under high stress, and can reveal the mechanical laws and mechanisms of tunnel surrounding rock failure and deformation to a certain extent.

[0003] However, as resource exploitation gradually develops towards the deep part, the stress environment of deep reservoirs is significantly different from that of shallow parts. Affected by triaxial stress, the fragmentation characteristics of rocks with different structures will change under jet impact. Most of the existing studies do not consider the real triaxial stress environment in which rocks are located. To simulate the real environment and ensure the scientific accuracy of the research. Summary of the Invention

[0004] Based on the problem that the existing experimental device cannot truly simulate the stress state of rocks while realizing jet erosion and cutting, the present invention aims to provide an experimental device and method for triaxial stress loading combined with abrasive jet cutting of rocks. This device can simulate the real stress state of rocks, organically combine triaxial confining pressure loading with abrasive jet rock breaking, conduct abrasive jet erosion or cutting experiments, and consider relevant experimental conditions of abrasive jets, with strong adaptability to ensure the science and accuracy of experimental research.

[0005] To solve the above technical problems, the following technical solutions are proposed:

[0006] An embodiment of the present application provides an experimental device for triaxial stress loading combined with abrasive jet cutting of rocks, which is characterized by including:

[0007] A frame for fixing a rock sample within the frame;

[0008] A triaxial stress loading system, which is arranged within the frame and used to apply stresses to the rock sample in three different planar directions;

[0009] An abrasive jet cutting system is provided on the frame for jetting abrasive onto a rock sample and cutting the rock sample with the abrasive.

[0010] Furthermore, in this embodiment, the abrasive jet cutting system includes a translation support and an abrasive jet device. The translation support is provided on the frame, the abrasive jet device is slidably provided on the translation support, the abrasive jet end of the abrasive jet device is oriented towards the direction of the rock sample, and the translation support is used to drive the abrasive jet device to move.

[0011] Furthermore, in this embodiment, the translation support includes:

[0012] Two groups of support rods, both of the two groups of support rods are provided on the frame, and the two groups of support rods are arranged in parallel;

[0013] A translation rod, the translation rod is provided between the two groups of support rods, and both ends of the translation rod are respectively connected to the two groups of support rods;

[0014] A first driving device, the first driving device is slidably provided on the translation rod for driving the abrasive jet device to slide along the direction of the translation rod.

[0015] Furthermore, in this embodiment, both ends of the translation rod and the support rods are slidably connected.

[0016] Furthermore, in this embodiment, there are three sets of the abrasive jet cutting systems, and the three sets of abrasive jet cutting systems are respectively located on three different planes of the rock sample.

[0017] Furthermore, in this embodiment, the triaxial stress loading system includes a hydraulic device and a rigid loading plate. The hydraulic device and the rigid loading plate are both provided inside the frame. One side of the rigid loading plate is connected to the hydraulic device, and the other side of the rigid loading plate is in contact with the surface of the rock sample.

[0018] Furthermore, in this embodiment, a gasket is also provided between the hydraulic device and the frame.

[0019] Furthermore, in this embodiment, a drainage groove is also provided on the side of the rigid loading plate in contact with the rock sample, and the end of the drainage groove extends to the edge of the rigid loading plate.

[0020] Furthermore, in this embodiment, drainage holes are also provided at the bottom of the frame.

[0021] The embodiment of the present application also provides an experimental method for triaxial stress loading combined with abrasive jet cutting of rock, which uses the experimental device described in any one of the above, and is characterized by including;

[0022] Obtain a rock sample and polish the rock sample;

[0023] Fix the rock sample at one corner of the frame through the triaxial stress loading system;

[0024] Control the triaxial stress loading system to apply stresses in three different plane directions to the rock sample in the frame. When the stress applied by the triaxial stress loading system to the rock sample reaches the target value and stabilizes, record the initial strain of the rock sample;

[0025] Control the abrasive jet cutting system to spray abrasives in the X / Y / Z directions of the rock sample in sequence or synchronously, and cut the rock sample according to a preset path;

[0026] Calculate the cutting efficiency by measuring the incision width, depth and volume removal rate; observe the crack network morphology through CT scanning or a cross-section microscope to evaluate the fracture effect of the rock sample.

[0027] Beneficial effects: The embodiment of the present application provides an experimental device and method for triaxial stress loading combined with abrasive jet cutting of rock, including a frame, a triaxial stress loading system and an abrasive jet cutting system. The rock sample is fixed in the frame, and the triaxial stress loading system is controlled to simultaneously apply stresses in three different plane directions of X / Y / Z to the rock sample in the frame to truly simulate the real stress state of the rock at the bottom of the well during the mine exploitation process; control the abrasive jet cutting system to spray abrasives on the rock sample to cut the rock sample, and then simulate the influence of the abrasive jet rock breaking technology on the rock at the bottom of the well during the mine exploitation and tunnel construction processes. Through the triaxial stress loading system and the abrasive jet cutting system, the real stress state of the rock at the bottom of the well during the drilling process can be truly simulated, and the influence law of the in-situ stresses in the three directions of X / Y / Z on the jet rock breaking efficiency can be analyzed, providing an indoor experimental research means for the application of high-pressure jet drilling technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of an experimental device for triaxial stress loading combined with abrasive jet cutting of rock provided by an embodiment of the present invention;

[0029] Figure 2 This is a cross-sectional view of an experimental device for triaxial stress loading combined with abrasive jet cutting of rock provided by an embodiment of the present invention;

[0030] Figure 3 This is a schematic structural diagram of the abrasive jet cutting system provided by an embodiment of the present invention;

[0031] Figure 4 Schematic diagram of the structure of the rigid loading plate provided by the embodiment of the present invention;

[0032] Figure 5 Schematic diagram of the structure of the movable slider provided by the embodiment of the present invention;

[0033] Figure 6 Schematic diagram of the structure of the jet nozzle part provided by the embodiment of the present invention.

[0034] Description of reference numerals

[0035] 1. Frame; 2. Triaxial stress loading system; 21. Hydraulic device;

[0036] 22. Rigid loading plate; 23. Gasket; 24. Drainage groove; 25. Drainage hole;

[0037] 3. Abrasive jet cutting system; 31. Translation bracket; 311. Support rod;

[0038] 312. Translation rod; 313. First driving device; 314. Fixed rod;

[0039] 315. Fixed nut; 316. Slide rail; 32. Abrasive jet device; 33. High-pressure water pump;

[0040] 34. Abrasive tank; 35. Jet nozzle; 36. High-pressure pipeline; 37. Movable slider;

[0041] 38. Groove; 39. Support beam; 40. Nozzle holder; 4. Rock sample. Detailed implementation manners

[0042] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawing description are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise clearly and specifically defined.

[0045] Reference to "embodiments" in this text means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0047] In the description of the embodiments of the present application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0048] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0050] Abrasive jet rock breaking technology is mainly used in fields such as mine exploitation and tunnel construction. It cuts and breaks rocks by high-pressure jetting of fluid mixed with abrasives. Compared with traditional blasting and mechanical rock breaking methods, abrasive jet rock breaking technology has the advantages of less environmental impact, precise control, and high working efficiency. Currently, the main scientific research methods include theoretical analysis, numerical calculation, and physical model simulation tests. Since rock mass is an anisotropic, inhomogeneous, and discontinuous material, and the in-situ stress environment in which the rock mass exists is complex and variable, there are great uncertainties in the mechanical parameters and stress environment of the rock mass, making it difficult to determine the rock mass parameters and boundary conditions required by theoretical analysis and numerical calculation methods. Physical model simulation tests can use real rock specimens (or physically similar simulation materials) for scientific experiments, which can intuitively reflect the failure and deformation process of tunnel surrounding rock under high stress, and can reveal the mechanical laws and mechanisms of tunnel surrounding rock failure and deformation to a certain extent.

[0051] However, as resource exploitation gradually develops towards deeper depths, the stress environment of deep reservoirs is significantly different from that of shallow depths. Affected by triaxial stress, the fragmentation characteristics of rocks with different structures will change under jet impact. Most existing studies do not consider the real triaxial stress environment in which the rocks are located. To simulate the real environment and ensure the scientific accuracy of the research.

[0052] To solve the technical problems that the existing experimental devices cannot truly simulate the stress state of rocks while realizing jet erosion and cutting, the present invention provides an experimental device and method for triaxial stress loading combined with abrasive jet cutting of rocks. This device can simulate the real stress state of rocks, organically combine triaxial confining pressure loading with abrasive jet rock breaking, conduct abrasive jet erosion or cutting experiments, and consider relevant experimental conditions of abrasive jets, with strong adaptability to ensure the science and accuracy of experimental research.

[0053] As Figure 1 shown, Figure 1 This is a schematic structural diagram of an experimental device for triaxial stress loading combined with abrasive jet cutting of rocks provided by an embodiment of the present application. The experimental device includes: a frame 1, a triaxial stress loading system 2, and an abrasive jet cutting system 3. Among them, the frame 1 is used to fix the rock sample within the frame 1; the triaxial stress loading system 2 is arranged within the frame 1 and is used to apply stress to the rock sample in three different planar directions; the abrasive jet cutting system 3 is arranged on the frame 1 and is used to spray abrasives at the rock sample and cut the rock sample through the abrasives.

[0054] Specifically, in this embodiment, the rock sample is fixed within the frame 1, and the triaxial stress loading system 2 is controlled to apply stresses in three different planar directions of X / Y / Z to the rock sample within the frame 1 simultaneously, so as to truly simulate the actual stress conditions of the rock at the bottom of the well during the mine exploitation process; the abrasive jet cutting system 3 is controlled to jet abrasives towards the rock sample to cut the rock sample, thereby simulating the influence of the abrasive jet rock breaking technology on the rock at the bottom of the well during the mine exploitation and tunnel construction processes. In this embodiment, through the triaxial stress loading system 2 and the abrasive jet cutting system 3, the actual stress conditions of the rock at the bottom of the well during the drilling process can be truly simulated, and the influence law of the in-situ stresses in the three directions of X / Y / Z on the jet rock breaking efficiency can be analyzed, providing an indoor experimental research method for the application of the high-pressure jet drilling technology.

[0055] Further, as Figure 3 shown, in this embodiment, the abrasive jet cutting system 3 includes a translation support 31 and an abrasive jet device 32. The translation support 31 is arranged on the frame 1, and the abrasive jet device 32 is slidably arranged on the translation support 31. The abrasive jet end of the abrasive jet device 32 is arranged towards the direction of the rock sample, and the translation support 31 is used to drive the abrasive jet device 32 to move. Exemplarily, in this embodiment, the abrasive jet device 32 is composed of a high-pressure water pump 33, an abrasive tank 34, a jet nozzle 35, and a high-pressure pipeline 36. The jet nozzle 35 is arranged on the translation support 31, and the high-pressure water pump 33, the abrasive tank 34, the high-pressure pipeline 36, and the jet nozzle 35 are connected in sequence. During the formal operation, the high-pressure water pump 33 is turned on, water is mixed with the abrasive in the abrasive tank, flows through the high-pressure pipeline 36, and the jet nozzle 35 is installed at the end of the high-pressure pipeline 36. The abrasive jet sprays out from the jet nozzle 35. At the same time, the jet nozzle 35 is driven to move by the translation support 31, and then the jet nozzle 35 is driven to spray the abrasive jet to cut the rock sample.

[0056] Secondly, when the jet nozzle 35 is driven by the translation support 31 to move to a certain position, the rock sample is subjected to fixed-point jet erosion by the abrasive jet device 32, so that this experimental device can not only complete the moving cutting experiment, but also realize the fixed-point jet erosion experiment.

[0057] Exemplarily, in this embodiment, the translation bracket 31 includes two sets of support rods 311, a translation rod 312, and a first driving device 313. Among them, the two sets of support rods 311 are both arranged on the frame 1. One end of the two sets of support rods 311 is fixedly arranged on the frame 1, and the other end extends away from the frame 1. The two sets of support rods 311 are arranged parallel to each other; the translation rod 312 is arranged between the two sets of support rods 311, and both ends of the translation rod 312 are respectively connected to the two sets of support rods 311; the first driving device 313 is slidably arranged on the translation rod 312 and is used to drive the abrasive jet device 32 to slide along the translation rod 312. By driving the abrasive jet device 32 to slide along the translation rod 312 through the first driving device 313, the cutting experiment of the rock sample can be realized. Exemplarily, in this embodiment, the first driving device 313 can select a servo motor to drive the abrasive jet device 32 to slide along the translation rod 312. During use, the servo motor is controlled by a servo motor controller to move, which can not only drive the abrasive jet device 32 to move more stably, but also adjust the moving speed of the abrasive jet device 32 according to requirements.

[0058] In some embodiments, as Figure 5 shown, the translation bracket 31 further includes a movable slider. There are two sets of translation rods 312, and the two sets of translation rods 312 are arranged parallel to each other between the two sets of support rods 311. Grooves are provided on both sides of the movable slider. The movable slider is arranged between the two translation rods, and the translation rods are placed in the grooves. The movable slider is slidably connected to the two translation rods through the grooves. The driving end of the first driving device is connected to the movable slider, and the abrasive jet device 32 is arranged on the movable slider. The first driving device drives the abrasive jet device 32 to slide through the movable slider.

[0059] In some embodiments, as Figure 6 shown, the abrasive jet cutting system 3 further includes a support beam and a nozzle holder. The support beam is arranged on the movable slider. One end of the support beam is fixedly arranged on the movable slider, and the other end of the support beam extends towards the rock sample inside the frame 1. The nozzle holder is arranged at the other end of the support beam and is used to hold the jet nozzle 35.

[0060] Furthermore, in this embodiment, both ends of the translation rod 312 are slidably connected to the support rod 311. It can be understood that in this embodiment, the relative position between the translation rod 312 and the support rod 311 can be adjusted. By adjusting the relative position between the translation rod 312 and the support rod 311, the relative height distance between the abrasive jet device 32 and the rock sample is changed, thereby achieving the adjustment of the target distance. Exemplarily, in this embodiment, fixing rods 314 and fixing nuts 315 are provided at both ends of the translation rod 312. A slide rail 316 groove is provided on the side wall of the support rod 311. The slide rail 316 groove is arranged along the length direction of the support rod 311. The translation rod 312 is placed between the two support rods 311. The fixing rods 314 at both ends of the translation rod 312 pass through the slide rail 316 groove. Threads adapted to the fixing nuts 315 are provided on the surface of the fixing rods 314. The fixing nuts 315 are detachably arranged on the fixing rods 314 and abut against the side wall of the support rod 311 away from the translation rod 312. During use, the adjustment of the translation rod 312 can be completed by twisting the fixing nuts 315, thereby changing the relative height distance between the abrasive jet device 32 and the rock sample, and achieving the adjustment of the target distance.

[0061] Furthermore, in this embodiment, there are three sets of abrasive jet cutting systems 3, and the three sets of abrasive jet cutting systems 3 are respectively located on three different planes of the rock sample. In this embodiment, a set of abrasive jet cutting system 3 is respectively arranged on three different planes of the rock sample. Through the three independent abrasive jet cutting systems 3, combined with the high-pressure fluid, abrasive particles and the triaxial stress loading system 2, the fracture behavior of the rock under multi-dimensional dynamic impact can be studied.

[0062] Exemplarily, in this embodiment, by controlling the three sets of abrasive jet cutting systems 3 to impact the rock sample simultaneously or in stages, through the linkage of the three sets of abrasive jet cutting systems 3, an intersecting crack network is formed in the rock sample, thereby accelerating the overall crushing efficiency of the rock sample and shortening the cutting time.

[0063] Secondly, in this embodiment, controlling the three sets of abrasive jet cutting systems 3 to impact the rock sample simultaneously or in stages controls the crack propagation mode. Exemplarily, the three sets of abrasive jet cutting systems 3 respectively output X-direction jet, Y-direction jet and Z-direction jet. In this embodiment, the Z-direction jet initiates cracking preferentially in the direction of the maximum principal stress. The stress difference is used to drive the crack to extend along the preset direction for main crack guidance. The auxiliary impact of the X / Y-direction jet can release local stress concentration, reduce the generation of random micro-cracks, improve the flatness of the section, and thus achieve the effect of suppressing secondary cracks.

[0064] It should be noted that in this embodiment, the three groups of abrasive jet cutting systems 3 can be used jointly or separately, and can support the free switching of single-axis, double-axis, and three-axis jet modes, which is applicable to different research objectives, such as single-point erosion experiments and the generation of complex fracture networks.

[0065] Furthermore, as Figure 2 described, in this embodiment, the triaxial stress loading system 2 includes a hydraulic device 21 and a rigid loading plate 22. Both the hydraulic device 21 and the rigid loading plate 22 are arranged within the frame 1. One side of the rigid loading plate 22 is connected to the hydraulic device 21, and the other side of the rigid loading plate 22 is in contact with the surface of the rock sample. During use, the hydraulic device 21 applies stress to the surface of the rock sample through the rigid loading plate 22, making the stress received by the surface of the rock sample uniform, and thus more truly simulating the stress environment of the rock.

[0066] Specifically, in this embodiment, the triaxial stress loading system 2 includes an X-axis stress loading system, a Y-axis stress loading system, and a Z-axis stress loading system. The frame 1 is a cubic box, and the X-axis stress loading system, the Y-axis stress loading system, and the Z-axis stress loading system are all arranged within the frame 1. During the experiment, the rock sample is processed into a standard size (such as 50×50×50mm 3 ), and the rock sample is placed at one of the corners of the frame 1, and three of its faces are in close contact with the surface of the frame 1. At this time, the X-axis stress loading system, the Y-axis stress loading system, and the Z-axis stress loading system are respectively in contact with the other three faces of the rock sample and apply stress to the contact surfaces of the rock sample. In this way, while fixing the rock sample in the frame 1 through the X-axis stress loading system, the Y-axis stress loading system, and the Z-axis stress loading system, stress is applied to the surface of the rock sample to simulate a real rock stress environment.

[0067] Exemplarily, in this embodiment, fixing the rock sample at one of the corners of the frame 1 through the X-axis stress loading system, the Y-axis stress loading system, and the Z-axis stress loading system not only makes the structure of the experimental device simpler, but also makes it easier to accurately grasp the position where the jet is applied from the outer wall. Specifically, a window is provided on the surface of the frame 1, and the abrasive jet cutting system 3 is arranged at this window, and abrasive is injected into the frame 1 through this window to complete the cutting of the rock sample. During this process, since the rock sample is in close contact with the side wall of the frame 1, the distance between the abrasive jet cutting system 3 and the rock sample is easier to control, and thus it is easier to accurately grasp the position where the jet is applied from the outer wall.

[0068] Further, in this embodiment, a gasket 23 is also provided between the hydraulic device 21 and the frame 1. In this embodiment, the gasket 23 is used to adjust the height of the hydraulic device 21 so that when the size of the rock sample changes, the hydraulic device 21 can also contact the surface of the rock sample through the rigid loading plate 22.

[0069] Exemplarily, as Figure 4 shown, in this embodiment, a drainage groove 24 is also provided on the side of the rigid loading plate 22 that contacts the rock sample. The end of the drainage groove 24 extends to the edge of the rigid loading plate 22. After the abrasive ejected by the abrasive jet cutting system 3 penetrates the rock sample, the abrasive ejected by the abrasive jet cutting system 3 can be discharged through the drainage groove 24 of the rigid loading plate 22 to prevent the abrasive from accumulating inside the rock sample.

[0070] Further, in this embodiment, a drainage hole 25 is also provided at the bottom of the frame 1 for discharging the residual abrasive inside the frame 1 to avoid affecting the experimental results or causing device damage. Specifically, by spraying clean water into the frame 1, the devices inside the frame 1 are cleaned, and thus the abrasive is washed to the drainage hole 25 and discharged through the drainage hole 25.

[0071] The embodiment of the present application also provides an experimental method for triaxial stress loading combined with abrasive jet cutting of rocks, applying the experimental device of any one of the above, including;

[0072] S1. Obtain a rock sample and polish the rock sample to a standard size (such as 50×50×50mm 3 ).

[0073] S2. Control the triaxial stress loading system 2 to apply pressure to the surface of the rock sample so that the rock sample is fixed at one of the corners of the frame 1.

[0074] S3. Control the triaxial stress loading system 2 to apply stresses in three different plane directions to the rock sample inside the frame 1. When the stress applied by the triaxial stress loading system 2 to the rock sample reaches the target value and stabilizes, record the initial strain.

[0075] S4. Control the abrasive jet cutting system 3 to eject abrasive in the X / Y / Z directions of the rock sample in sequence or synchronously and cut the rock sample according to a preset path.

[0076] S5. Calculate the cutting efficiency by measuring the incision width, depth and volume removal rate; evaluate the fracture effect of the rock sample by observing the crack network morphology through CT scanning or a cross-section microscope.

[0077] It should be noted that this application is not limited to the above embodiments. The above embodiments are only examples, and embodiments with the same composition and the same function and effect as the technical idea within the scope of the technical solution of this application are included in the technical scope of this application. In addition, within the scope of not departing from the gist of this application, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways constructed by combining some of the constituent elements in the embodiments are also included in the scope of this application.

Claims

1. An experimental device for triaxial stress loading combined with abrasive water jet cutting of rock, characterized in that, Comprising: A frame for fixing a rock sample within the frame; A triaxial stress loading system disposed within the frame for applying stresses to the rock sample in three different planar directions; An abrasive jet cutting system disposed on the frame for jetting abrasives onto the rock sample and cutting the rock sample by means of the abrasives.

2. The experimental device for triaxial stress loading combined with abrasive water jet cutting rock according to claim 1, characterized in that, The abrasive jet cutting system includes a translation support and an abrasive jet device. The translation support is disposed on the frame, the abrasive jet device is slidably disposed on the translation support, the abrasive jet end of the abrasive jet device is oriented towards the direction of the rock sample, and the translation support is used to drive the abrasive jet device to move.

3. The experimental device for triaxial stress loading combined with abrasive water jet cutting rock according to claim 2, characterized in that, The translation support includes: Two sets of support rods, both of the two sets of support rods are disposed on the frame, and the two sets of support rods are arranged in parallel; A translation rod disposed between the two sets of support rods, and both ends of the translation rod are respectively connected to the two sets of support rods; A first driving device slidably disposed on the translation rod for driving the abrasive jet device to slide along the direction of the translation rod.

4. The experimental device for triaxial stress loading combined with abrasive water jet cutting rock according to claim 3, characterized in that, Both ends of the translation rod and the support rods are slidably connected.

5. The experimental device for triaxial stress loading combined with abrasive jet cutting of rock according to any one of claims 1-4, characterized in that, There are three sets of the abrasive jet cutting systems, and the three sets of abrasive jet cutting systems are respectively located on three different planes of the rock sample.

6. The experimental device for triaxial stress loading combined abrasive jet cutting of rock according to claim 1, characterized in that The triaxial stress loading system includes a hydraulic device and a rigid loading plate. Both the hydraulic device and the rigid loading plate are disposed within the frame. One side of the rigid loading plate is connected to the hydraulic device, and the other side of the rigid loading plate is in contact with the surface of the rock sample.

7. The experimental device for triaxial stress loading combined with abrasive jet cutting of rock according to claim 6, characterized in that, A gasket is further provided between the hydraulic device and the frame.

8. The experimental device for triaxial stress loading combined with abrasive water jet cutting rock according to claim 6, characterized in that, A drainage groove is further provided on the side of the rigid loading plate in contact with the rock sample, and the end of the drainage groove extends to the edge portion of the rigid loading plate.

9. The experimental device for triaxial stress loading combined with abrasive water jet cutting rock according to claim 1, characterized in that, A drainage hole is further provided at the bottom of the frame.

10. An experimental method for triaxial stress loading combined with abrasive water jet cutting of rock, applying the experimental device described in any one of claims 1-9, characterized in that, Including; Obtaining a rock sample and performing a grinding treatment on the rock sample; Fixing the rock sample at one of the corners of the frame by means of the triaxial stress loading system; Controlling the triaxial stress loading system to apply stresses to the rock sample within the frame in three different planar directions, and recording the initial strain of the rock sample when the stress applied by the triaxial stress loading system to the rock sample reaches the target value and stabilizes; Sequentially or synchronously controlling the abrasive jet cutting system to jet abrasives onto the rock sample in the X / Y / Z directions and cutting the rock sample according to a preset path; Calculating the cutting efficiency by measuring the incision width, depth and volume removal rate; evaluating the fracture effect of the rock sample by observing the crack network morphology through CT scanning or a cross-section microscope.

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