Grouting device and preparation method of prefabricated fractured rock mass sample

Abstract

The present application relates to geotechnical engineering technical field, disclose a kind of precast fissured rock mass sample grouting device and preparation method, device includes slurry preparation mechanism, sample curing mechanism and grouting mechanism;The slurry preparation mechanism is used to prepare slurry, viscosity sensor is equipped in the slurry preparation mechanism;Sample curing mechanism is equipped with temperature and humidity adjusting assembly;The grouting mechanism includes grouting chamber, pressure sensor, grouting assembly and fixture;The grouting chamber is detachably connected in the sample curing mechanism, the fixture and the pressure sensor are all installed in the grouting chamber, one end of the grouting assembly is communicated with the slurry preparation mechanism, and the other end is installed with telescopic grouting pipe;The telescopic grouting pipe is extended into the grouting chamber.This application can be directly carried out constant temperature, constant humidity curing under the premise of not moving sample, and the success rate of sample preparation is improved by two-step cutting.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering technology, and in particular to a grouting device and preparation method for prefabricated fractured rock mass samples. Background Technology

[0002] In geotechnical engineering, mining engineering, and other fields, the presence of primary or engineered fractures in rock masses can degrade the rock's strength, elastic modulus, Poisson's ratio, and other mechanical properties, thus significantly impacting rock mass stability and engineering quality. Grouting reinforcement of fractured rock masses is one of the effective means to improve their mechanical properties. However, how to test the mechanical properties of grouted fractured rock masses and evaluate the effectiveness of grouting reinforcement is a major challenge frequently faced by engineers in this field. Preparing standard grouted fractured rock mass specimens in the laboratory and conducting mechanical property tests is one effective method to solve this problem.

[0003] Currently, the preparation of standard rock mass specimens with grouting fractures mostly adopts a one-step molding method. That is, first, a complete rock test standard specimen is prepared (e.g., a 50mm × 100mm cylindrical specimen, a 50mm × 50mm × 50mm cubic specimen, etc.), then fractures of the required shape, direction, and opening are cut into the standard specimen, grouting material is filled into the fractures, and finally, after the grouting material solidifies and dries, the rock mechanical properties are tested. In the prior art, Chinese patent CN114993787A discloses a high-pressure grouting filling device, system, and method for rock standard specimen fractures, which uses a method of first preparing a standard specimen, then cutting through-type fractures, and finally grouting to prepare prefabricated fracture grouting standard specimens. However, in actual operation, this method has the following main shortcomings:

[0004] The operation sequence and method of first preparing a complete standard rock test specimen and then cutting the crack are as follows: due to the small size of the standard specimen, the cutting load cannot form a stable far-field stress in the rock due to the size effect. At the same time, the energy required for rock fracture is low. The pre-made crack may suddenly become unstable and expand, causing the crack to deflect or bifurcate unexpectedly, resulting in a low success rate of pre-made crack specimens and a low success rate of actual specimen preparation.

[0005] When the pre-cast crack on the standard sample is a through crack, the sample before grouting is divided into two parts and needs to be fixed separately. The fixing accuracy is high. In actual operation, the pre-cast crack size parameters often deviate from the design value due to the deviation of the fixing position of the two parts of the sample, which cannot meet the crack size design requirements.

[0006] Currently, when grouting precast crack specimens, over-grouting is prone to occur. In addition to filling the crack space, the grout can also adhere to other parts of the specimen surface, causing the specimen size to no longer be that of a standard specimen after grouting, thereby reducing the accuracy of mechanical parameter test results.

[0007] To address this, a grouting device and preparation method for prefabricated fractured rock mass samples are proposed. Summary of the Invention

[0008] The purpose of this invention is to provide a grouting device and preparation method for prefabricated fractured rock mass samples, aiming to solve or improve at least one of the above-mentioned technical problems.

[0009] To achieve the above objectives, the present invention provides the following solution: The present invention provides a grouting device for prefabricated fractured rock mass samples, comprising:

[0010] A slurry preparation mechanism, wherein the slurry preparation mechanism is used to prepare slurry, and a viscosity sensor is provided inside the slurry preparation mechanism;

[0011] A sample curing mechanism, wherein the sample curing mechanism is equipped with a temperature and humidity control component;

[0012] The grouting mechanism includes a grouting chamber, a pressure sensor, a grouting assembly, and a clamp. The grouting chamber is detachably connected to the sample curing mechanism. The clamp and the pressure sensor are both installed in the grouting chamber. One end of the grouting assembly is connected to the slurry preparation mechanism, and the other end is equipped with a telescopic grouting pipe. The telescopic grouting pipe extends into the grouting chamber.

[0013] According to the present invention, a grouting device for prefabricated fractured rock mass samples is provided, wherein the grout preparation mechanism comprises:

[0014] A reaction vessel, wherein several viscosity sensors are installed inside the reaction vessel; the grouting chamber and the grouting assembly are respectively connected to the reaction vessel via connecting pipes;

[0015] An electric motor is mounted on the reactor. The output shaft of the motor is connected to a stirring shaft via a coupling. The stirring shaft extends into the reactor and is equipped with several stirring impellers.

[0016] A slurry preparation parameter control platform is installed on the outer wall of the reaction vessel; the motor and several viscosity sensors are electrically connected to the slurry preparation parameter control platform.

[0017] A first computer is electrically connected to the slurry preparation parameter control platform via a first connecting wire.

[0018] According to the present invention, a grouting device for prefabricated fractured rock mass samples includes a sample curing mechanism comprising a curing chamber and a second computer. A curing parameter control platform is installed on the curing chamber. The temperature and humidity control assembly includes a heating wire, a humidifier, a temperature sensor, and a humidity sensor. The pressure sensor, the heating wire, the humidifier, the temperature sensor, and the humidity sensor are all electrically connected to the curing parameter control platform. The curing parameter control platform is electrically connected to the second computer via a second connecting wire. The grouting chamber is detachably connected to the curing chamber.

[0019] According to the present invention, a grouting device for a precast fractured rock mass sample is provided, wherein the grouting assembly includes a grouting pump, and a grouting parameter control platform is installed on the grouting pump, and the grouting parameter control platform is electrically connected to a second computer via a second connecting wire;

[0020] The telescopic grouting pipe and the reaction vessel are respectively connected to the grouting pump through connecting pipes; a flow rate sensor is installed on the connecting pipe, and both the flow rate sensor and the grouting pump are electrically connected to the grouting parameter control platform.

[0021] According to the present invention, a grouting device for prefabricated fractured rock mass specimens is provided, wherein the grouting chamber includes a base and a cover, the base is detachably connected to the inner bottom wall of the curing chamber, the cover is detachably connected to the top of the base, the clamp is installed on the base, and the clamp is located inside the cover;

[0022] The cover is provided with a grouting port, and the telescopic grouting pipe extends into the inner cavity of the cover through the grouting port. The grouting chamber is connected to the reactor through a connecting pipe, and the pressure sensor is installed on the inner wall of the cover.

[0023] According to the present invention, a grouting device for prefabricated fractured rock mass samples is provided, wherein the cover includes a top plate and four vertical plates, the four vertical plates are detachably connected to the four sides of the top surface of the base, the top plate is detachably connected to the top of the four vertical plates, the pressure sensor is installed on the inner wall of one of the vertical plates, and the grouting port is opened on the top plate.

[0024] According to the present invention, a grouting device for prefabricated fractured rock mass samples is provided, wherein the clamp includes a plurality of slidable clamps, all of which are slidably connected to the base, and the slidable clamps are detachably connected to the base via a positioning part.

[0025] This invention also provides a method for preparing a pre-fabricated fractured rock mass sample, comprising the following steps:

[0026] Step 1: Obtain a complete sample of the test rock mass;

[0027] Step 2: Perform the first cutting of the sample in the laboratory to prepare a preliminary sample. The length of the preliminary sample is 1.2-1.5 times the length of the standard sample, the width of the preliminary sample is 1.2-1.5 times the width of the standard sample, and the height of the preliminary sample is 1.2-1.5 times the height of the standard sample.

[0028] Step 3: Cut pre-made cracks on the prepared sample according to the preset crack shape, direction and opening;

[0029] Step 4: Prepare grouting reinforcement material using a grout preparation mechanism. Monitor and provide feedback on the grout's fluidity in real time using a viscosity sensor. Adjust the component dosage of the grouting material based on the data monitored by the viscosity sensor.

[0030] Step 5: Place the pre-cut sample with pre-made cracks in the grouting chamber, adjust the grouting position by telescopic grouting pipe so that the grouting position is aligned with the pre-made crack position of the sample, fix the sample with clamps, and fill the gap between the sample and the grouting chamber with polyurethane foam material.

[0031] Step 6: Adjust the grout flow rate, grouting pressure, and holding time, and perform preliminary sample grouting;

[0032] Step 7: Open the grouting chamber, remove the polyurethane foam material, expose the grouting pre-test to the test curing mechanism, and adjust the curing temperature, humidity and time in the test curing mechanism to cure the grouting pre-test until the test specimen is completely solidified and meets the set test requirements.

[0033] Step 8: Remove the grouting preparation sample after curing, and cut it a second time in the laboratory to prepare a prefabricated fractured rock mass grouting standard sample.

[0034] Step 9: Test the strength, elastic modulus, and other mechanical parameters of the precast fractured rock mass grouting standard sample on a rock mechanical property testing machine to evaluate the grouting reinforcement effect.

[0035] According to the method for preparing a precast fractured rock mass sample provided by the present invention, in step six, during grouting, the initial grouting is first performed using a pressure of 1 / 5 times the preset grouting pressure value. After the grout stops flowing under the initial grouting pressure, the pressure is then increased to the preset value. The pressure increase process takes 1 min to 5 min.

[0036] According to a method for preparing a pre-fabricated fractured rock mass sample provided by the present invention, in step three, a cutting machine or a carving machine is used to cut out pre-fabricated fractures on the prepared sample.

[0037] The present invention discloses the following technical effects:

[0038] This invention employs a two-step cutting process: first, a preliminary sample 1.2-1.5 times the required standard sample size is cut out; then, a standard sample with pre-made cracks is obtained through a second cutting, greatly improving the success rate of sample preparation. The two-step cutting process ensures that the dimensional error values ​​meet the testing requirements, fundamentally solving the problems of grout material adhesion and non-compliance on the surface of grouted samples after traditional single-step cutting, and the substandard dimensional parameters of the grouted samples.

[0039] In this invention, since the size of the first cut preparation sample is 1.2-1.5 times that of the required standard sample, when cutting the prefabricated crack on the large-size preparation sample, regardless of whether the prefabricated crack on the final standard sample is through or non-through, the large-size preparation sample after the prefabricated crack is cut can still remain as a connected unified body, which is convenient for fixing the sample and keeping the prefabricated crack parameters accurate and unchanged during subsequent grouting.

[0040] After grouting the fractured rock mass, this invention disassembles the grouting chamber, removes the polyurethane foam material, and exposes the grouted pre-prepared sample in the sample curing mechanism. Constant temperature and humidity curing can be carried out directly without moving the sample until the sample is completely solidified and meets the testing requirements. This reduces sample damage such as grout falling off during the movement of uncured samples after grouting and improves preparation efficiency. Attached Figure Description

[0041] 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 introduced 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.

[0042] Figure 1 This is a schematic diagram of the structure of the present invention;

[0043] Figure 2 This is a schematic diagram of the fixture in this invention;

[0044] Figure 3 This is a schematic diagram of the maintenance parameter control platform in this invention;

[0045] Figure 4 This is a schematic diagram of the grouting chamber in this invention;

[0046] Figure 5 This is a flowchart of the preparation method of the present invention;

[0047] Figure 6 The stress-strain curve of the prefabricated fractured rock mass grouting standard sample of the present invention is shown.

[0048] The components include: 1. Reactor; 2. Agitator impeller; 3. Motor; 4. Slurry preparation parameter control platform; 5. Viscosity sensor; 6. First connecting wire; 7. First computer; 8. Grouting pump; 9. Connecting pipeline; 10. Grouting chamber; 11. Grouting port; 12. Sliding clamp; 13. Pressure sensor; 14. Flow rate sensor; 15. Grouting parameter control platform; 16. Second connecting wire; 17. Curing chamber; 18. Heating wire; 19. Humidifier; 20. Temperature sensor; 21. Humidity sensor; 22. Curing parameter control platform; 23. Vertical plate; 24. Top cover; 25. Base; 26. Second computer. Detailed Implementation

[0049] 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.

[0050] 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.

[0051] Reference Figures 1-6 This invention provides a grouting device for prefabricated fractured rock mass samples, comprising:

[0052] The slurry preparation mechanism is used to prepare slurry, and a viscosity sensor 5 is installed inside the slurry preparation mechanism;

[0053] The sample curing mechanism is equipped with a temperature and humidity control component.

[0054] The grouting mechanism includes a grouting chamber 10, a pressure sensor 13, a grouting assembly, and a clamp. The grouting chamber 10 is detachably connected to the sample curing mechanism. The clamp and the pressure sensor 13 are both installed in the grouting chamber 10. One end of the grouting assembly is connected to the grout preparation mechanism, and the other end is equipped with a telescopic grouting pipe. The telescopic grouting pipe extends into the grouting chamber 10.

[0055] With this configuration, after the grouting of the fractured rock mass is completed, the grouting chamber is disassembled, the polyurethane foam material is removed, and the prepared grouting sample is exposed in the sample curing mechanism. Constant temperature and humidity curing can be carried out directly without moving the sample until the sample is completely solidified and meets the testing requirements. This reduces sample damage such as grout falling off during the movement of uncured samples after grouting and improves the preparation efficiency.

[0056] The scheme has been further optimized, and the slurry preparation mechanism includes:

[0057] The reactor 1 is equipped with several viscosity sensors 5; the grouting chamber 10 and the grouting assembly are connected to the reactor 1 through connecting pipes 9.

[0058] Motor 3 is mounted on reactor 1. The output shaft of motor 3 is connected to a stirring shaft via a coupling. The stirring shaft extends into reactor 1 and is equipped with several stirring impellers 2.

[0059] The slurry preparation parameter control platform 4 is installed on the outer wall of the reaction vessel; the motor 3 and several viscosity sensors 5 are electrically connected to the slurry preparation parameter control platform 4.

[0060] The first computer 7 is electrically connected to the slurry preparation parameter control platform 4 via the first connecting wire 6;

[0061] After the materials are added to the reactor 1, the motor 3 drives the stirring shaft and the stirring impeller 2 to rotate, mixing the materials. The viscosity sensor 5 monitors the slurry viscosity in real time and transmits the data to the slurry preparation parameter control platform 4. The slurry preparation parameter control platform 4 adjusts the speed of the motor 3 according to the preset viscosity threshold: if the viscosity is too high, the speed is increased to strengthen the stirring; if the viscosity is too low, the speed is decreased or the material ratio is adjusted. The first computer 7 receives the data from the slurry preparation parameter control platform 4, performs in-depth analysis and parameter optimization, generates control commands and feeds them back to the slurry preparation parameter control platform 4, realizing closed-loop control of the slurry viscosity and ensuring that the prepared slurry meets the grouting requirements.

[0062] Further optimization of the scheme: the sample curing mechanism includes a curing chamber 17 and a second computer 26. A curing parameter control platform 22 is installed on the curing chamber 17. The temperature and humidity control components include a heating wire 18, a humidifier 19, a temperature sensor 20, and a humidity sensor 21. The pressure sensor 13, heating wire 18, humidifier 19, temperature sensor 20, and humidity sensor 21 are all electrically connected to the curing parameter control platform 22. The curing parameter control platform 22 is electrically connected to the second computer 26 via a second connecting wire 16. The grouting chamber 10 is detachably connected to the curing chamber 17.

[0063] After grouting is completed, the grouting chamber 10 is placed inside the curing chamber 17. Temperature sensor 20 and humidity sensor 21 collect real-time temperature and humidity data within the curing chamber 17 and transmit it to the curing parameter control platform 22. The curing parameter control platform 22 compares the data with preset curing conditions and automatically controls the operation of the heating wire 18 and humidifier 19. When the temperature is lower than the set value, the heating wire 18 is activated to raise the temperature; when the humidity is insufficient, the humidifier 19 is turned on to increase humidity. Pressure sensor 13 synchronously monitors pressure changes within the grouting chamber, and the data is transmitted to the second computer 26 via the second connecting wire 16. This data is used to analyze the impact of grouting effect and pressure during the curing process, achieving coordinated control of the curing environment and grouting pressure.

[0064] The grouting component is further optimized to include a grouting pump 8, on which a grouting parameter control platform 15 is installed. The grouting parameter control platform 15 is electrically connected to a second computer 26 via a second connecting wire 16.

[0065] The telescopic grouting pipe and the reaction vessel 1 are respectively connected to the grouting pump 8 through the connecting pipe 9; a flow rate sensor 14 is installed on the connecting pipe 9, and both the flow rate sensor 14 and the grouting pump 8 are electrically connected to the grouting parameter control platform 15.

[0066] Driven by the grouting parameter control platform 15, the grouting pump 8 transports the grout from the reactor 1 to the grouting chamber 10 via the connecting pipeline 9. The flow rate sensor 14 monitors the grout flow rate in the pipeline in real time and feeds the data back to the grouting parameter control platform 15. The grouting parameter control platform 15 automatically adjusts the power of the grouting pump 8 according to the preset grouting speed: if the flow rate is too fast, the pump's output pressure is reduced; if the flow rate is too slow, the pressure is increased. Simultaneously, the grouting parameter control platform 15 communicates with the second computer 26 via the second connecting wire 16, receiving grouting parameter optimization instructions from the computer to ensure a stable and accurate grouting process.

[0067] Further optimization of the scheme: the grouting chamber 10 includes a base 25 and a cover. The base 25 is detachably connected to the inner bottom wall of the curing chamber 17, and the cover is detachably connected to the top of the base 25. The clamp is installed on the base 25 and is located inside the cover.

[0068] The cover is provided with a grouting port 11. The telescopic grouting pipe extends into the inner cavity of the cover through the grouting port 11. The grouting chamber 10 is connected to the reactor 1 through the connecting pipe 9. The pressure sensor 13 is installed on the inner wall of the cover.

[0069] The design is further optimized so that the cover includes a top plate and four vertical plates 23. The four vertical plates 23 are detachably connected to the four sides of the top surface of the base 25. The top plate is detachably connected to the top of the four vertical plates 23. The pressure sensor 13 is installed on the inner wall of one of the vertical plates 23. The grouting port 11 is opened on the top plate.

[0070] Further optimization of the solution: the fixture includes several slidable clamping plates 12, all of which are slidably connected to the base 25, and the slidable clamping plates 12 and the base 25 are detachably connected through the positioning part.

[0071] The base 25 is fixed to the bottom of the curing chamber 17 by bolts or clips. The sliding clamp 12 is adjusted in position on the base 25 according to the sample size, and the sample is fixed by positioning parts (such as bolts or clips). The telescopic grouting pipe extends into the casing through the grouting port 11, and the grouting pump 8 injects grout into the grouting chamber 10. The pressure sensor 13 monitors the pressure changes inside the casing in real time during the grouting process to prevent excessive pressure from damaging the sample or equipment. After grouting is completed, the casing and base 25 are disassembled, and the sample is left in the curing chamber 17 for curing. The modular design facilitates equipment maintenance and sample replacement.

[0072] This invention also provides a method for preparing a pre-fabricated fractured rock mass sample, comprising the following steps:

[0073] Step 1: Obtain a complete sample of the test rock mass;

[0074] Step 2: Perform the first cutting of the sample in the laboratory to prepare a preliminary sample. The length of the preliminary sample is 1.2-1.5 times the length of the standard sample, the width of the preliminary sample is 1.2-1.5 times the width of the standard sample, and the height of the preliminary sample is 1.2-1.5 times the height of the standard sample.

[0075] Step 3: Cut pre-made cracks on the prepared sample according to the preset crack shape, direction and opening;

[0076] Step 4: Prepare grouting reinforcement material using a grout preparation mechanism. Monitor and provide feedback on the grout flowability in real time using a viscosity sensor 5. Adjust the component dosage of the grouting material based on the data monitored by the viscosity sensor 5.

[0077] Step 5: Place the pre-cut sample with pre-made cracks in the grouting chamber 10, adjust the grouting position by telescopic grouting pipe so that the grouting position is aligned with the pre-made crack position of the sample, fix the sample with clamps, and fill the gap between the sample and the grouting chamber 10 with polyurethane foam material.

[0078] Step 6: Adjust the grout flow rate, grouting pressure, and holding time, and perform preliminary sample grouting;

[0079] Step 7: Open the grouting chamber 10, remove the polyurethane foam material, expose the grouting pre-test in the test curing mechanism to achieve in-situ curing of the grouting pre-test, and adjust the curing temperature, humidity and time in the test curing mechanism to carry out the curing of the grouting pre-test until the test specimen is completely solidified and meets the set test requirements.

[0080] Step 8: Remove the grouting preparation sample after curing, and cut it a second time in the laboratory to prepare a prefabricated fractured rock mass grouting standard sample.

[0081] Step 9: Test the strength, elastic modulus, and other mechanical parameters of the precast fractured rock mass grouting standard specimens on a rock mechanical property testing machine to evaluate the grouting reinforcement effect;

[0082] With this setup, the present invention employs a two-step cutting process: first, a preliminary sample 1.2-1.5 times the required standard sample size is cut out; then, a standard sample with pre-made cracks is obtained through a second cutting process, which greatly improves the success rate of sample preparation. Through the two-step cutting process, standard samples whose dimensional parameter error values ​​meet the testing requirements can be obtained, fundamentally solving the problems of grouting material adhesion and bonding on the surface of grouting samples after traditional single cutting, and the substandard dimensional parameters of grouting samples.

[0083] In this invention, since the size of the first cut preparation sample is 1.2-1.5 times that of the required standard sample, when cutting the prefabricated crack on the large-size preparation sample, regardless of whether the prefabricated crack on the final standard sample is through or non-through, the large-size preparation sample after the prefabricated crack is cut can still remain as a connected unified body, which is convenient for fixing the sample and ensuring the accuracy of the prefabricated crack parameters during subsequent grouting.

[0084] To further optimize the scheme, in step six, during grouting, the initial grouting is carried out using a pressure of 1 / 5 times the preset grouting pressure value. After the grout stops flowing under the initial grouting pressure, the pressure is increased to the preset value. The pressure increase process takes 1 to 5 minutes.

[0085] To further optimize the scheme, in step three, a cutting machine or engraving machine is used to cut out pre-made cracks on the prepared sample.

[0086] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0087] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A grouting device for prefabricated fractured rock mass samples, characterized in that, include: A slurry preparation mechanism is used to prepare slurry, and a viscosity sensor (5) is provided inside the slurry preparation mechanism. A sample curing mechanism, wherein the sample curing mechanism is equipped with a temperature and humidity control component; The grouting mechanism includes a grouting chamber (10), a pressure sensor (13), a grouting assembly, and a clamp. The grouting chamber (10) is detachably connected to the sample curing mechanism. The clamp and the pressure sensor (13) are both installed in the grouting chamber (10). One end of the grouting assembly is connected to the slurry preparation mechanism, and the other end is equipped with a telescopic grouting pipe. The telescopic grouting pipe extends into the grouting chamber (10).

2. The grouting device for prefabricated fractured rock mass samples according to claim 1, characterized in that: The slurry preparation mechanism includes: The reactor (1) is equipped with several viscosity sensors (5); the grouting chamber (10) and the grouting assembly are respectively connected to the reactor (1) through connecting pipes (9); Motor (3), the motor (3) is installed on the reactor (1), the output shaft of the motor (3) is connected to a stirring shaft via a coupling, the stirring shaft extends into the reactor (1), and a plurality of stirring impellers (2) are installed on the stirring shaft. A slurry preparation parameter control platform (4) is installed on the outer wall of the reactor (1); the motor (3) and several viscosity sensors (5) are electrically connected to the slurry preparation parameter control platform (4); The first computer (7) is electrically connected to the slurry preparation parameter control platform (4) via the first connecting wire (6).

3. The grouting device for prefabricated fractured rock mass samples according to claim 2, characterized in that: The sample curing mechanism includes a curing chamber (17) and a second computer (26). A curing parameter control platform (22) is installed on the curing chamber (17). The temperature and humidity control components include a heating wire (18), a humidifier (19), a temperature sensor (20), and a humidity sensor (21). The pressure sensor (13), the heating wire (18), the humidifier (19), the temperature sensor (20), and the humidity sensor (21) are all electrically connected to the curing parameter control platform (22). The curing parameter control platform (22) is electrically connected to the second computer (26) through a second connecting wire (16). The grouting chamber (10) is detachably connected to the curing chamber (17).

4. The grouting device for prefabricated fractured rock mass samples according to claim 3, characterized in that: The grouting assembly includes a grouting pump (8), on which a grouting parameter control platform (15) is installed. The grouting parameter control platform (15) is electrically connected to the second computer (26) via a second connecting wire (16). The telescopic grouting pipe and the reaction vessel (1) are respectively connected to the grouting pump (8) through the connecting pipe (9); a flow rate sensor (14) is installed on the connecting pipe (9), and the flow rate sensor (14) and the grouting pump (8) are electrically connected to the grouting parameter control platform (15).

5. The grouting device for prefabricated fractured rock mass samples according to claim 3, characterized in that: The grouting chamber (10) includes a base (25) and a cover. The base (25) is detachably connected to the inner bottom wall of the curing chamber (17). The cover is detachably connected to the top of the base (25). The clamp is installed on the base (25) and the clamp is located inside the cover. The cover is provided with a grouting port (11), and the telescopic grouting pipe extends into the inner cavity of the cover through the grouting port (11). The grouting chamber (10) is connected to the reactor (1) through the connecting pipe (9). The pressure sensor (13) is installed on the inner wall of the cover.

6. The grouting device for prefabricated fractured rock mass samples according to claim 5, characterized in that: The cover includes a top plate and four vertical plates (23). The four vertical plates (23) are detachably connected to the four sides of the top surface of the base (25). The top plate is detachably connected to the top of the four vertical plates (23). The pressure sensor (13) is installed on the inner wall of one of the vertical plates (23). The grouting port (11) is opened on the top plate.

7. The grouting device for prefabricated fractured rock mass samples according to claim 5, characterized in that: The clamp includes several slidable clamps (12), all of which are slidably connected to the base (25), and the slidable clamps (12) and the base (25) are detachably connected by a positioning part.

8. A method for preparing a precast fractured rock mass sample, based on the grouting device for the precast fractured rock mass sample according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Obtain a complete sample of the test rock mass; Step 2: Perform the first cutting of the sample in the laboratory to prepare a preliminary sample. The length of the preliminary sample is 1.2-1.5 times the length of the standard sample, the width of the preliminary sample is 1.2-1.5 times the width of the standard sample, and the height of the preliminary sample is 1.2-1.5 times the height of the standard sample. Step 3: Cut pre-made cracks on the prepared sample according to the preset crack shape, direction and opening; Step 4: Prepare grouting reinforcement material using a grout preparation mechanism, monitor and provide feedback on the grout flowability in real time using a viscosity sensor (5), and adjust the component dosage of the grouting material based on the data monitored by the viscosity sensor (5); Step 5: Place the pre-cut sample with pre-made cracks in the grouting chamber (10), adjust the grouting position by telescopic grouting pipe so that the grouting position is aligned with the pre-made crack position of the sample, fix the sample with clamps, and fill the gap between the sample and the grouting chamber (10) with polyurethane foam material. Step 6: Adjust the grout flow rate, grouting pressure, and holding time, and perform preliminary sample grouting; Step 7: Open the grouting chamber (10), remove the polyurethane foam material, expose the grouting pre-test to the test curing mechanism, and adjust the curing temperature, humidity and time in the test curing mechanism to cure the grouting pre-test until the test specimen is completely solidified and meets the set test requirements. Step 8: Remove the grouting preparation sample after curing, and cut it a second time in the laboratory to prepare a prefabricated fractured rock mass grouting standard sample. Step 9: Test the strength, elastic modulus, and other mechanical parameters of the precast fractured rock mass grouting standard sample on a rock mechanical property testing machine to evaluate the grouting reinforcement effect.

9. The method for preparing prefabricated fractured rock mass samples according to claim 8, characterized in that: In step six, during grouting, initial grouting is performed using a pressure 1 / 5 times the preset grouting pressure value. Once the grout stops flowing at the initial grouting pressure, the pressure is increased to the preset value. The pressure increase process takes 1 to 5 minutes.

10. The method for preparing prefabricated fractured rock mass samples according to claim 8, characterized in that: In step three, a cutting machine or engraving machine is used to cut pre-made cracks on the prepared sample.

Images