Test device and method for representing anti-dynamic water dispersion performance of pouring type anchoring agent under multiple working conditions

Abstract

The invention relates to the field of rock engineering, and discloses a test device and a test method for representing the anti-dynamic water dispersion performance of a pouring type anchoring agent under multiple working conditions, the test device comprises a capped hole steel pipe, a filter screen groove, a constant flow pump, a water tank, a static mixer, an AB material box and a pressure pump, the capped hole steel pipe is composed of a hole double-layer steel pipe, a threaded pipe cap and a water stop screw, the threaded pipe cap is matched with the hole double-layer steel pipe, the water stop screw is matched with a hole of the hole double-layer steel pipe and used for adjusting the circulation state of the hole, and through the exquisite structural design of the capped hole steel pipe, the hole double-layer steel pipe, the threaded pipe cap and the water stop screw are cooperatively matched, and the circulation state of the hole is flexibly adjusted through the water stop screw; various common actual flowing water working conditions such as no flowing water on the hole wall-flowing water at the hole bottom, flowing water on the hole wall-no flowing water at the hole bottom, flowing water on the hole wall-flowing water at the hole bottom and the like in rock engineering can be accurately reproduced, so that a test environment is highly fit with a real application scene of a pouring type anchoring agent.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rock engineering, in particular to a kind of perfusion type anchoring agent multi-working condition anti-flow dispersion performance characterization test device and method. BACKGROUND

[0002] In the field of rock engineering such as water conservancy and hydropower, tunnel and mine, perfusion type anchoring agent is the key material to ensure the stability of engineering structure. Due to the simplicity of mixing two components 1:1, high early strength, high anchoring quality, easy to realize automatic full-length anchoring, it is gradually replacing the traditional resin cartridge mixing type anchoring agent. In underground engineering, anchoring operation often needs to be completed in complex conditions with flowing water, and its anti-flow dispersion performance directly determines the mechanical strength and long-term reliability of the anchoring system. In the actual complex conditions such as high flow rate water flow, multidirectional flow field, temperature fluctuation or chemical environment coupling, the traditional anchoring agent is prone to component dispersion loss, resulting in significant deterioration of mechanical properties after solidification, and even causing anchoring failure, which poses a potential threat to engineering safety. However, the current industry performance evaluation system for perfusion type anchoring agent has obvious limitations: the existing standards mainly focus on the basic performance indicators of anchoring agent in static environment, such as setting time and compressive strength, and lack of specific test specifications and evaluation standards for anti-dispersion performance under dynamic water conditions, making it difficult to select anchoring agent suitable for complex dynamic water environment according to uniform criteria in engineering practice. At the same time, the existing anti-flow dispersion performance characterization test device is mainly used for grouting materials, which cannot be used for perfusion type anchoring agent, and cannot simulate anchoring conditions. Most of the devices can only simulate the working condition under the action of a single factor (such as fixed flow rate unidirectional water flow), and cannot reproduce the multi-field coupling environment (such as water flow direction change, flow rate fluctuation and chemical erosion superposition) commonly seen in actual engineering, which makes the test environment deviate greatly from the real application scene, and the test results have limited guiding value for engineering practice. In addition, the existing device generally lacks real-time monitoring of water flow state and anchoring agent mixing process, and has not established effective quantitative evaluation means, which can only judge the dispersion of anchoring agent by visual observation and other qualitative methods, and cannot accurately characterize its anti-flow dispersion performance. At the same time, the overall applicability of the device (such as the inability to flexibly adjust the simulated working condition type) and the operation stability (such as the water flow state is easy to fluctuate) are insufficient, which further leads to poor repeatability and low reliability of test data. With the extension of China's infrastructure engineering to deep and complex geological conditions, the engineering has higher requirements for the rapid curing ability, anti-complex environmental interference reliability and environmental friendliness of anchoring agent. However, the above defects of the existing technical system make the accurate characterization of the anti-flow dispersion performance of perfusion type anchoring agent a key bottleneck restricting engineering safety and anchoring agent technology upgrading, and it is urgent to develop a test device and method that can break through the existing limitations and meet the actual working condition requirements. SUMMARY

[0003] In view of the deficiencies of the prior art, the application provides a perfusion type anchoring agent multi-working-condition anti-dynamic water dispersibility performance characterization test device and method, which solves the problems in the background art.

[0004] To achieve the above object, the application is implemented by the following technical scheme: a perfusion type anchoring agent multi-working-condition anti-dynamic water dispersibility performance characterization test device, comprising a capped hole steel pipe, a filter screen groove, a constant flow pump, a water tank, a static mixer, an AB material box and a pressure pump, the capped hole steel pipe is composed of a hole double-layer steel pipe, a threaded pipe cap and a water stop screw, the water stop screw is matched with the hole of the hole double-layer steel pipe and is used for adjusting the flow state of the hole. The thickness of the capped hole steel pipe is 35-55 mm, and the internal cavity height is 15-35 mm; the two walls of the hole double-layer steel pipe are provided with 10 circular holes with a diameter of 14 mm, and the bottom is provided with a hole with a diameter of 35-45 mm; the threaded pipe cap has a diameter of 140-175 mm, a bolt hole with a diameter of 28-35 mm is formed at the center of the threaded pipe cap, and a bolt hole with a diameter of 20-30 mm is formed at a position corresponding to the water inlet of the threaded pipe cap and at a distance of 39-40 mm from the center. The constant flow pump has a cuboid structure with a size of 300 mm*100 mm, and the maximum flow rate can reach 200 ml / min. The water tank has a cuboid structure with a size of 250 mm*200 mm*200 mm and is used for storing circulating water required for the test. The filter screen groove has a cuboid structure with a size of 20 mm*10 mm*10 mm, two 200-mesh filter screens are detachably inserted in the inside, and is used for retaining anchoring agent dispersed particles. The static mixer has a honeycomb structure, a length of 200-220 mm and is used for mixing anchoring agent AB materials. The AB material box has a cuboid structure with a volume of 3 L, is divided into two independent chambers by a steel plate with a thickness of 5 mm in the inside, and is used for containing anchoring agent A materials and B materials, respectively. The pressure pump has a double-cylinder structure and is used for pressing the anchoring agent in the AB material box into the static mixer.

[0005] Preferably, the 10 circular holes with a diameter of 14 mm on the two walls of the hole double-layer steel pipe are uniformly distributed along the circumference of the hole double-layer steel pipe.

[0006] Preferably, the bolt hole with a distance of 39-40 mm from the center of the threaded pipe cap is sealingly connected to the water outlet of the constant flow pump through a rubber hose, and the inner diameter of the rubber hose is matched with the diameter of the bolt hole.

[0007] Preferably, the constant flow pump is equipped with a flow adjustment knob, which can achieve stepless flow adjustment within the range of 0-200ml / min, and the pump body surface is equipped with a flow display screen for real-time display of the current circulating water flow.

[0008] Preferably, the top of the filter screen groove is provided with a circular receiving interface that matches the bottom hole of the capped perforated steel pipe. The inner wall of the receiving interface is attached with a water-resistant sealing ring, and the outer wall of the filter screen groove is provided with scale lines for observing the accumulation height of the trapped particles.

[0009] Preferably, both ends of the static mixer are equipped with quick-connect couplings. One end is connected to the two discharge ports of the AB material box through a high-pressure resistant hose, and the other end is connected to the inlet of the pressure pump through a high-pressure resistant hose. The pressure resistance rating of the high-pressure resistant hose is not less than 15MPa.

[0010] Preferably, the bottom of each of the two independent chambers of the AB material box is provided with a discharge port with a manual valve. The opening degree of the valve can be adjusted by a knob, and the inner wall of the chamber is provided with an anti-corrosion coating to prevent the anchoring agent from corroding the chamber.

[0011] A test method for characterizing the resistance to dynamic water dispersion of injection-type anchoring agents under multiple working conditions includes the following steps: Step 1: Before the test, check the connection status of each component of the device to ensure that there are no leaks in the pipeline between the capped perforated steel pipe, the constant flow pump, the water tank and the pressure pump. Take out the two 200 mesh filter screens in the filter screen groove, dry them and weigh them and record the initial weight m0. Step 2: According to the target working condition of the anchoring agent to be tested, adjust the flow state of the hole by rotating the water-stop screw: If there is no water flowing on the hole wall but water flowing at the bottom of the hole, close the water-stop screws corresponding to the round holes on both walls of the double-layer steel pipe of the hole, leaving only the bottom hole connected; if there is water flowing on the hole wall but no water flowing at the bottom of the hole, close the bottom hole by using the water-stop screw, and open some or all of the round holes on both walls of the double-layer steel pipe of the hole; if there is water flowing on the hole wall and water flowing at the bottom of the hole, open both round holes on both walls of the double-layer steel pipe of the hole and the bottom hole at the same time. Step 3: Add sufficient water to the water tank, turn on the constant flow pump, adjust the flow rate to the target value, and let the water circulation system run stably for 5 to 10 minutes to ensure that the water flow condition meets the target working conditions. Step 4: Add the anchoring agent A and B to be tested into the two independent chambers of the AB material box, turn on the pressure pump, and adjust the injection pressure to the test set value so that the A and B materials are mixed in the static mixer according to the preset ratio. The mixed anchoring agent is pumped into the hollow grouting anchor cable in the capped perforated steel pipe to simulate the grouting process under dynamic water conditions and continue grouting for the set time. Step 5: After grouting is completed, turn off the constant flow pump and pressure pump, remove the two filter screens in the filter screen groove, remove the water adhering to the surface and dry them, weigh them and record the final weight m1; Step 6: Calculate the amount of anchoring agent loss Δm = m1 - m0. The magnitude of Δm characterizes the resistance to dynamic water dispersion of the anchoring agent under the target working conditions. The smaller the Δm, the stronger the resistance to dynamic water dispersion.

[0012] This invention provides a test apparatus and method for characterizing the anti-dynamic water dispersion performance of injection-type anchoring agents under multiple working conditions. It has the following beneficial effects: 1. This invention utilizes a sophisticated structural design of a capped perforated steel pipe: a double-layered perforated steel pipe, a threaded cap, and a water-stop screw work together. The water-stop screw allows for flexible adjustment of the flow state within the perforation, accurately replicating various real-world dynamic water conditions commonly encountered in rock engineering, such as no water flow at the hole wall but water flow at the bottom, water flow at the hole wall but no water flow at the bottom, and water flow at the hole wall and water flow at the bottom. This ensures the test environment closely matches the actual application scenarios of injection-type anchoring agents. Simultaneously, the water circulation system composed of a constant flow pump and a water tank continuously and stably controls the water flow, avoiding deviations in test results caused by water flow fluctuations. This provides a reliable test basis for accurately evaluating the anti-dynamic water dispersion performance of anchoring agents under different working conditions, thus providing a scientific basis for selecting anchoring agents suitable for complex dynamic water environments in major rock engineering projects such as water conservancy, hydropower, tunnels, and mines, effectively ensuring the safety and stability of engineering anchoring systems.

[0013] 2. This invention uses a detachable filter screen within the filter groove to trap dispersed anchoring agent particles. By combining this with weighing before and after the test to calculate the loss, the performance of the anchoring agent can be evaluated intuitively and accurately. Furthermore, the design of each component of the device takes into account both practicality and controllability. The AB material boxes independently store anchoring agent A and B materials through separate chambers. The anti-corrosion coating on the inner wall of the chambers can prevent anchoring agent corrosion. The discharge port with a regulating valve at the bottom can flexibly control the material output ratio. The static mixer can ensure uniform mixing of AB materials, and the pressure pump can stably provide extrusion pressure to replicate the actual grouting operation. The overall structure is simple to manufacture, the operation process is clear, and tests can be carried out quickly without complicated debugging. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the detailed structure of the capped perforated steel pipe of the present invention.

[0015] Among them, 1. steel pipe with cap and hole; 2. filter screen groove; 3. constant flow pump; 4. water tank; 5. static mixer; 6. AB material box; 7. pressure pump; 1-a. double-layer steel pipe with hole; 1-b. threaded pipe cap; 1-c. water stop screw. Detailed Implementation

[0016] The technical solutions in 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.

[0017] Please see the appendix Figure 1 - Appendix Figure 2 This invention provides a multi-condition anti-dynamic water dispersion performance characterization test device, including a capped perforated steel pipe 1, a filter screen trough 2, a constant flow pump 3, a water tank 4, a static mixer 5, an AB material box 6, and a pressure pump 7. The capped perforated steel pipe 1 is composed of a perforated double-layer steel pipe 1-a, a threaded pipe cap 1-b, and a water-stop screw 1-c. The water-stop screw 1-c is adapted to the holes of the perforated double-layer steel pipe 1-a and is used to adjust the flow state of the holes. The thickness of the capped perforated steel pipe 1 is 35-55mm, and the internal cavity height is 15-35mm; the two walls of the perforated double-layer steel pipe 1-a have 10 round holes with a diameter of 14mm, and the bottom has a hole with a diameter of 35-45mm; the diameter of the threaded pipe cap 1-b is 140-175mm, and a bolt hole with a diameter of 28-35mm is opened at its center; at the position of the threaded pipe cap 1-b corresponding to the water inlet, a bolt hole with a diameter of 20-30mm is opened 39-40mm away from the center; Specifically, the capped perforated steel pipe 1, as the core component of the working condition simulation, consists of a double-layer perforated steel pipe 1-a, a threaded pipe cap 1-b, and a water-stop screw 1-c. The round holes on both walls of the double-layer perforated steel pipe 1-a are used to simulate water flow on the hole wall, and the hole at the bottom is used to simulate water flow at the hole bottom. The water-stop screw 1-c is adapted to the holes in the double-layer perforated steel pipe 1-a, and the flow state can be flexibly adjusted by opening or closing the holes at different positions, thereby accurately reproducing the "no water flow on the hole wall - water flow at the hole bottom" and "water flow on the hole wall" scenarios in engineering. The test covered various real-world water flow conditions, including "water flow on the borehole wall and water flow at the bottom of the borehole." The thickness and internal cavity height of the capped perforated steel pipe 1 ensured the structural stability during testing and provided a suitable space for on-site grouting. The bolt hole at the center of the threaded cap 1-b was used to connect the hollow grouting anchor cable for effective injection of the anchoring agent. The bolt hole at the location of the threaded cap 1-b corresponding to the water inlet, at a specific distance from the center, was used to connect the water circulation pipeline. The system ensures that water flow can be stably introduced into the capped perforated steel pipe 1 to maintain the working condition. The constant flow pump 3 and the water tank 4 work together to form a closed-loop water circulation system, which can continuously provide a stable flow of water to the capped perforated steel pipe 1, avoiding inconsistent test conditions due to water flow fluctuations, and further ensuring the accuracy of the working condition simulation. The AB material box 6 is used to store anchoring agent A and B materials respectively to prevent the two materials from reacting and failing prematurely. The pressure pump 7 can stably push the materials in the AB material box 6 to the static mixer 5. The static mixer 5 can make the A and B materials fully and evenly mixed, accurately reproducing the mixing and grouting process of anchoring agent in actual engineering. The filter screen trough 2 is used to intercept anchoring agent particles that are dispersed and lost due to the action of dynamic water during the test. It provides a key carrier for the subsequent quantitative evaluation of the anchoring agent's resistance to dynamic water dispersion by "weighing before and after the test to calculate the amount of loss". The overall structural design not only achieves a high degree of reproduction of complex dynamic water working conditions, but also ensures the controllability of the test process and the reliability of the results, effectively solving the problems of single working condition simulation and lack of accuracy in performance characterization of traditional devices.

[0018] The constant flow pump 3 has a rectangular structure with dimensions of 300mm × 100mm and a maximum flow rate of 200ml / min. Water tank 4 is a cuboid structure with dimensions of 250mm×200mm×200mm, used to store the circulating water required for the experiment; The filter slot 2 is a cuboid structure with dimensions of 20mm×10mm×10mm. Two 200-mesh filter screens can be detachably inserted inside to trap dispersed particles of the anchoring agent. Specifically, water tank 4, as the core storage component of the circulating water, provides a sufficient and stable reserve of test water due to its cuboid structure. This ensures a basic water source for the normal operation of constant flow pump 3 and the continuous simulation of dynamic water conditions, preventing test interruptions or unstable water flow due to insufficient water volume. The cuboid design of constant flow pump 3 not only facilitates layout adaptation with other components of the device, but more importantly, it can achieve a maximum flow rate output of 200 ml / min. It can precisely adjust the water flow rate and maintain a stable flow rate according to different dynamic water conditions, effectively avoiding interference from water flow fluctuations on the test results of the anchoring agent's resistance to dynamic water dispersion. This ensures that the simulated dynamic water environment is highly consistent with the actual water flow state in engineering, enhancing the realism of the simulation. The filter trough 2 has a compact cuboid structure that precisely connects to the bottom outlet of the capped perforated steel pipe 1. Inside, two detachable 200-mesh filter screens efficiently trap anchoring agent particles dispersed and lost during the test due to water flow, preventing deviations in subsequent loss calculations. The detachable nature of the filter screens facilitates drying and weighing before and after the test, allowing for accurate quantification of anchoring agent loss through the weight difference. This provides direct and reliable data support for scientifically characterizing the anchoring agent's resistance to water dispersion. These three elements work together to ensure the smooth conduct of the test and the accuracy of the test results from three key dimensions: water supply, stable water flow control, and capture of lost particles.

[0019] The static mixer 5 has a honeycomb structure and a length of 200-220mm, and is used to mix anchoring agent AB material; The AB material box 6 is a rectangular structure with a volume of 3L. The interior is divided into two independent chambers by a steel plate with a thickness of 5mm, which are used to hold anchoring agent A and B respectively. The pressure pump 7 is a dual-cylinder structure used to press the anchoring agent in the AB material box 6 into the static mixer 5.

[0020] Specifically, the AB material box 6, serving as the core for storing anchoring agent raw materials, adopts a 3L rectangular structure. This structure not only meets the raw material requirements for a single test but also facilitates layout adaptation with other components of the device. Internally, it is divided into two independent chambers by a 5mm thick steel plate, which can respectively hold anchoring agent A and B. This physically isolates the two materials, effectively preventing them from prematurely contacting each other and reacting chemically before injection, thus ensuring the initial performance stability of the raw materials. The pressure pump 7 employs a dual-cylinder design, providing stable and balanced injection pressure for the two materials within the AB material box 6. It precisely controls the delivery rate of materials A and B, ensuring that the two materials enter the static mixer 5 synchronously and continuously according to the preset test ratio, avoiding pressure fluctuations. This leads to an imbalance in the mixing ratio, which in turn affects the final performance of the anchoring agent. The static mixer 5 is designed with a honeycomb structure and a length set at 200-220mm. The honeycomb structure can significantly increase the contact area and disturbance frequency of material A and material B during the transportation process. With the appropriate length design, it can ensure that the two raw materials are fully and uniformly mixed during the flow of the mixer, perfectly replicating the mixing state of the anchoring agent before grouting in actual engineering. This provides a uniform anchoring agent for the subsequent grouting test under simulated dynamic water conditions in the capped perforated steel pipe 1. The three components, from raw material storage and stable transportation to full mixing, form a complete anchoring agent preparation chain, ensuring that the state of the anchoring agent used in the test is highly consistent with the actual application scenario, laying the foundation for accurately characterizing the anchoring agent's resistance to dynamic water dispersion.

[0021] Ten 14mm diameter circular holes are evenly distributed along the circumference of the double-layer steel pipe 1-a on both walls. The bolt hole on the threaded pipe cap 1-b, which is 39-40mm away from the center, is sealed to the outlet of the constant flow pump 3 through a rubber hose, and the inner diameter of the rubber hose is matched with the diameter of the bolt hole.

[0022] The constant flow pump 3 is equipped with a flow adjustment knob, which can achieve stepless flow adjustment within the range of 0-200ml / min, and the pump body surface is equipped with a flow display screen to display the current circulating water flow in real time.

[0023] Specifically, ten 14mm diameter circular holes are evenly distributed circumferentially on both walls of the double-layer steel pipe 1-a. This design ensures that the water delivered by the constant flow pump 3 flows out evenly along the circumference of the double-layer steel pipe 1-a, simulating the uniformity of water flow distribution on the borehole wall in actual rock engineering. This avoids deviations in the dispersion of the anchoring agent due to local water flow concentration or uneven flow, ensuring consistency between the test conditions and the actual scenario. The bolt hole on the threaded cap 1-b, located 39-40mm from the center, is sealed to the outlet of the constant flow pump 3 via a rubber hose, with the inner diameter of the rubber hose matching the diameter of the bolt hole. This connection method effectively prevents water leakage during delivery, avoiding pressure fluctuations or water volume changes in the water circulation system due to leakage. While minimizing water loss, it also ensures smooth water flow into the capped orifice steel pipe 1, maintaining the stability of the water circulation system. The flow adjustment knob on the constant flow pump 3 can achieve stepless flow adjustment within the range of 0-200ml / min, accurately adjusting the water flow rate according to different test conditions (such as orifice wall flow and orifice bottom flow at different flow rates), meeting the simulation needs of various dynamic water scenarios. At the same time, the flow display screen on the pump body can display the current circulating water flow rate in real time, making it convenient for test personnel to intuitively monitor and correct flow deviations in a timely manner, avoiding the loss of control of test conditions due to unstable flow. The three work together to ensure the accuracy and stability of dynamic water condition simulation from three key dimensions: water flow uniformity, delivery sealing, and flow rate controllability.

[0024] The top of the filter screen trough 2 is equipped with a circular receiving interface that matches the bottom hole of the capped perforated steel pipe 1. A water-resistant sealing ring is affixed to the inner wall of the receiving interface, and the outer wall of the filter screen trough 2 has graduation lines for observing the accumulation height of the trapped particles. Both ends of the static mixer 5 are equipped with quick-connect couplings. One end connects to the two discharge ports of the AB material box 6 via a high-pressure resistant hose, and the other end connects to the inlet of the pressure pump 7 via a high-pressure resistant hose. The pressure resistance rating of the high-pressure resistant hose is not less than 15 MPa.

[0025] Specifically, the circular receiving interface at the top of the filter screen trough 2, which matches the bottom hole of the capped perforated steel pipe 1, ensures that the water containing anchoring agent dispersion particles flowing out of the capped perforated steel pipe 1 is completely guided into the filter screen trough 2, preventing particle leakage due to interface misalignment. The water-resistant sealing ring pasted on the inner wall of the receiving interface effectively blocks water leakage from interface gaps, preventing leakage from affecting the accuracy of particle retention. Simultaneously, the scale lines on the outer wall of the filter screen trough 2 allow testers to visually observe the real-time accumulation height of the retained particles, assisting in judging the dynamic trend of anchoring agent dispersion and loss, and providing a direct reference for subsequent weighing and quantitative analysis. The quick-connect fittings at both ends of the static mixer 5 can... The quick disassembly and assembly between the two discharge ports of AB material box 6 and the inlet of pressure pump 7 greatly improves the convenience of device assembly, material replacement and maintenance. The high-pressure resistant hose used for connection has a pressure resistance rating of no less than 15MPa, which can stably adapt to the extrusion pressure generated by pressure pump 7 during operation, avoiding hose rupture due to excessive pressure and leakage of anchoring agent. This ensures that materials A and B in AB material box 6 are stably transported to static mixer 5 under pressure drive and fully mixed, ensuring the mixing quality of anchoring agent and the safety of the transportation process. The two work together to provide support for the controllability of the test process and the accuracy of the test results from the aspects of particle capture accuracy and raw material transportation stability.

[0026] The bottom of each of the two independent chambers of AB material box 6 is equipped with a discharge port with a manual valve. The opening degree of the valve can be adjusted by a knob, and the inner wall of the chamber is equipped with an anti-corrosion coating to prevent the anchoring agent from corroding the chamber.

[0027] Specifically, the two independent chambers of the AB material box 6 are equipped with an anti-corrosion coating. This coating effectively isolates the anchoring agent from direct contact with the chamber walls, preventing corrosion damage to the chambers due to long-term contact with the anchoring agent and extending the service life of the AB material box 6. It also prevents the chamber material from corroding and falling off and mixing into the anchoring agent, ensuring the purity of the anchoring agent raw materials is not contaminated, and providing a basic guarantee for the stability of the anchoring agent performance in subsequent tests. At the same time, the bottom of each chamber is equipped with a discharge port with a manual valve. The valve opening can be flexibly adjusted by a knob. The tester can accurately control the output flow of material A and material B according to the anchoring agent formulation requirements, and then adjust the ratio of the two raw materials entering the static mixer 5. This ensures that materials A and B are fully mixed according to the preset ratio, avoiding deviations in anchoring agent performance due to imbalance of raw material ratio, which would affect the accuracy of the anti-dynamic water dispersion performance test results. The overall design not only achieves safe storage of anchoring agent raw materials, but also provides support for the precise mixing of subsequent anchoring agents through controllable discharge adjustment, perfectly adapting to the strict requirements of the test on the anchoring agent preparation process.

[0028] A multi-condition anti-dynamic water dispersion performance characterization test method, according to any one of claims 1-7, includes the following steps: Step 1: Before the test, check the connection status of each component of the device to ensure that there are no leaks in the pipeline between the capped perforated steel pipe 1, constant flow pump 3, water tank 4 and pressure pump 7. Take out the two 200 mesh filter screens in the filter screen groove 2, dry them, weigh them and record the initial weight m0. Step 2: According to the target working condition of the anchoring agent to be tested, rotate the water-stop screw 1-c to adjust the flow state of the hole: If the hole wall is dry and the bottom is dry, close the water-stop screw 1-c corresponding to the round holes on both walls of the double-layer steel pipe 1-a, leaving only the bottom hole open; if the hole wall is dry and the bottom is dry, close the bottom hole with the water-stop screw 1-c and open some or all of the round holes on both walls of the double-layer steel pipe 1-a; if the hole wall is dry and the bottom is dry, open both round holes on both walls of the double-layer steel pipe 1-a and the bottom hole at the same time. Step 3: Add sufficient water to water tank 4, turn on constant flow pump 3, adjust the flow rate to the target value of 0-200ml / min, and make the water circulation system run stably for 5-10 minutes to ensure that the water flow condition meets the target working conditions. Step 4: Add the anchoring agent A and B to be tested into the two independent chambers of AB material box 6, turn on the pressure pump 7, adjust the injection pressure to the test set value, so that the A and B materials enter the static mixer 5 to mix according to the preset ratio, and the mixed anchoring agent is pumped into the hollow grouting anchor cable in the capped perforated steel pipe 1 to simulate the grouting process under dynamic water conditions, and continue grouting until the set time. Step 5: After grouting is completed, turn off the constant flow pump 3 and pressure pump 7, take out the two filter screens in the filter screen groove 2, remove the water attached to the surface and dry them, weigh and record the final weight m1; Step 6: Calculate the amount of anchoring agent loss Δm = m1 - m0. The magnitude of Δm characterizes the resistance to dynamic water dispersion of the anchoring agent under the target working conditions. The smaller the Δm, the stronger the resistance to dynamic water dispersion.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test apparatus for characterizing the anti-dynamic water dispersion performance of an injection-type anchoring agent under multiple working conditions, characterized in that, The system includes a capped perforated steel pipe (1), a filter screen groove (2), a constant flow pump (3), a water tank (4), a static mixer (5), an AB material box (6), and a pressure pump (7). The capped perforated steel pipe (1) is composed of a perforated double-layer steel pipe (1-a), a threaded pipe cap (1-b), and a water-stop screw (1-c). The water-stop screw (1-c) is adapted to the holes of the perforated double-layer steel pipe (1-a) and is used to adjust the flow state of the holes. The thickness of the capped perforated steel pipe (1) is 35-55mm, and the internal cavity height is 15-35mm; the two walls of the perforated double-layer steel pipe (1-a) are provided with 10 round holes with a diameter of 14mm, and the bottom is provided with a hole with a diameter of 35-45mm; the diameter of the threaded pipe cap (1-b) is 140-175mm, and a bolt hole with a diameter of 28-35mm is provided at its center; at the position of the threaded pipe cap (1-b) corresponding to the water inlet, a bolt hole with a diameter of 20-30mm is provided 39-40mm away from the center; The constant flow pump (3) is a cuboid structure with dimensions of 300mm×100mm and a maximum flow rate of 200ml / min; The water tank (4) is a cuboid structure with dimensions of 250mm×200mm×200mm, used to store the circulating water required for the experiment; The filter screen groove (2) is a cuboid structure with a size of 20mm×10mm×10mm. Two 200-mesh filter screens can be detachably inserted inside to trap the dispersed particles of the anchoring agent. The static mixer (5) has a honeycomb structure and a length of 200-220 mm, and is used to mix anchoring agent AB material; The AB material box (6) is a cuboid structure with a volume of 3L. The interior is divided into two independent chambers by a steel plate with a thickness of 5mm, which are used to hold anchoring agent A and B respectively. The pressure pump (7) is a dual-cylinder structure used to press the anchoring agent in the AB material box (6) into the static mixer (5).

2. The multi-condition anti-dynamic water dispersion performance characterization test device according to claim 1, characterized in that, The 10 14mm diameter circular holes on both walls of the perforated double-layer steel pipe (1-a) are evenly distributed along the circumference of the perforated double-layer steel pipe (1-a).

3. The multi-condition anti-dynamic water dispersion performance characterization test device according to claim 1, characterized in that, The bolt hole on the threaded cap (1-b) is 39-40 mm away from the center. It is sealed to the outlet of the constant flow pump (3) through a rubber hose, and the inner diameter of the rubber hose is matched with the diameter of the bolt hole.

4. The test device for characterizing the anti-dynamic water dispersion performance of injection-type anchoring agent under multiple working conditions according to claim 1, characterized in that, The constant flow pump (3) is equipped with a flow adjustment knob, which can achieve stepless flow adjustment in the range of 0-200ml / min, and the pump body surface is equipped with a flow display screen to display the current circulating water flow in real time.

5. The test device for characterizing the anti-dynamic water dispersion performance of injection-type anchoring agent under multiple working conditions according to claim 1, characterized in that, The top of the filter screen groove (2) is provided with a circular receiving interface that matches the bottom hole of the capped perforated steel pipe (1). The inner wall of the receiving interface is pasted with a water-resistant sealing ring, and the outer wall of the filter screen groove (2) is provided with scale lines for observing the accumulation height of the intercepted particles.

6. The test apparatus for characterizing the anti-dynamic water dispersion performance of injection-type anchoring agent under multiple working conditions according to claim 1, characterized in that, The static mixer (5) is equipped with quick-connect couplings at both ends. One end is connected to the two discharge ports of the AB material box (6) through a high-pressure resistant hose, and the other end is connected to the inlet of the pressure pump (7) through a high-pressure resistant hose. The pressure resistance of the high-pressure resistant hose is not less than 15MPa.

7. The test device for characterizing the anti-dynamic water dispersion performance of injection-type anchoring agent under multiple working conditions according to claim 1, characterized in that, The bottom of the two independent chambers of the AB material box (6) is provided with a discharge port with a manual valve. The opening degree of the valve can be adjusted by a knob, and the inner wall of the chamber is provided with an anti-corrosion coating to prevent the anchoring agent from corroding the chamber.

8. A multi-condition test method for characterizing the anti-dynamic water dispersion performance of an injection-type anchoring agent, comprising the multi-condition anti-dynamic water dispersion performance characterization test apparatus according to any one of claims 1-7, including the following steps: Step 1: Before the test, check the connection status of each component of the device to ensure that there is no leakage in the pipeline between the capped perforated steel pipe (1), constant flow pump (3), water tank (4) and pressure pump (7). Take out the two 200 mesh filter screens in the filter screen groove (2), dry them, weigh them and record the initial weight m0. Step 2: According to the target working condition of the anchoring agent to be tested, rotate the water-stop screw (1-c) to adjust the flow state of the hole: If the hole wall is dry and the bottom is dry, close the water-stop screw (1-c) corresponding to the round holes on both walls of the double-layer steel pipe (1-a) of the hole, leaving only the bottom hole open; if the hole wall is dry and the bottom is dry, close the bottom hole with the water-stop screw (1-c) and open some or all of the round holes on both walls of the double-layer steel pipe (1-a); if the hole wall is dry and the bottom is dry, open both round holes on both walls and the bottom hole of the double-layer steel pipe (1-a) of the hole at the same time. Step 3: Add sufficient water to the water tank (4), turn on the constant flow pump (3), adjust the flow rate to the target value (0-200ml / min), and make the water circulation system run stably for 5-10 minutes to ensure that the water flow condition meets the target working conditions; Step 4: Add the anchoring agent A and B to be tested into the two independent chambers of the AB material box (6), turn on the pressure pump (7), adjust the injection pressure to the test set value, so that the A and B materials enter the static mixer (5) to mix according to the preset ratio, and the mixed anchoring agent is pumped into the hollow grouting anchor cable in the capped hole steel pipe (1) to simulate the grouting process under dynamic water conditions, and continue grouting until the set time; Step 5: After grouting is completed, turn off the constant flow pump (3) and pressure pump (7), take out the two filter screens in the filter screen groove (2), remove the water attached to the surface and dry them, weigh and record the final weight m1; Step 6: Calculate the amount of anchoring agent loss Δm = m1 - m0. The magnitude of Δm characterizes the resistance to dynamic water dispersion of the anchoring agent under the target working conditions. The smaller the Δm, the stronger the resistance to dynamic water dispersion.

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