Device for testing dispersion resistance of grouting material in water and use method

Abstract

The invention relates to the technical field of performance testing of grouting and water plugging materials for rock and underground engineering, in particular to a device for testing dispersion resistance of a grouting material in water and a using method, and the testing device comprises a constant-temperature water bath, a water suction pump, a scouring tank, a precipitation tank, a stirrer, a vibration exciter and a base. The constant-temperature water bath is used for keeping the water temperature constant, the water suction pump provides dynamic water scouring power, the scouring tank simulates the dynamic water scouring effect, the precipitation tank collects residues, and the stirrer and the vibration exciter are used for stirring water flow and simulating external disturbance respectively; the method comprises the steps of static water anti-dispersion testing, dynamic water anti-scouring testing, data acquisition and analysis and test result analysis. According to the method, the underground water flowing and construction disturbance environment can be truly represented under the laboratory condition, reliable data support is provided, and scientific basis and guidance are provided for the safety and stability of grouting construction of rock and underground engineering, so that the grouting material with the optimal proportion is designed according to local conditions.

Description

Technical Field

[0001] The invention relates to the technical field of performance testing of grouting and water blocking materials for rock and soil and underground engineering, and in particular to a grouting material anti-dispersion test device in water and a use method thereof. Background Art

[0002] In the field of geotechnical and underground engineering, grouting technology is widely used in engineering projects such as underground structure reinforcement, foundation treatment, anti-seepage and plugging. The anti-dispersion performance of grouting materials in a water-rich environment is one of the key factors affecting the stability of the project and the durability of later operations. Under complex geological conditions, groundwater flow will have a scouring effect on the grouting materials, weakening their reinforcement effect and even causing project failure. Therefore, accurately evaluating the anti-dispersion performance of grouting materials in a water-rich environment is of great significance for selecting suitable grouting materials and optimizing the grouting process.

[0003] At present, the anti-dispersion performance test of grouting materials is divided into anti-dispersion performance in static water and anti-scouring performance in moving water. The anti-dispersion performance test in static water mainly refers to the test method in DL / T 5117-2021 "Test Procedure for Underwater Non-Dispersible Concrete", which directly pours the sample into a container filled with water, and then uses the weighing method to test the solid content in the suspension. There is currently no unified standard for anti-scouring performance in moving water. The commonly used method is to place the initial setting sample on a rough stone slab, place it in a water channel with different flow rates for a certain period of time, and then test the retention rate of the sample. This method is simple and direct, but it cannot accurately simulate the dynamic water environment under complex geological conditions.

[0004] There are many existing technologies for testing the performance of grouting materials against scouring in moving water, such as:

[0005] Patent publication numbers CN117589639A and CN117250129A disclose a grouting material anti-dynamic water dispersion performance test device and test method and a grouting material anti-dynamic water dispersion performance test device and test method, respectively. The two patents realize the anti-dynamic water dispersion performance during the grouting construction process under the underground dynamic water environment. However, after the grouting construction is completed, the slurry sample blocks the dynamic water circulation channel, making it difficult to conduct subsequent anti-scouring durability tests;

[0006] Patent authorization number CN114295515B discloses a grouting material anti-dynamic water scouring performance test device and use method. By controlling the scouring pressure, scouring frequency and water bath temperature, the scouring effect of groundwater on grouting materials under different geological conditions is simulated. However, if long-term testing is required, the problem of waste of water resources will be faced, and the existing methods do not take into account the impact of the construction process on grouting, such as the blasting vibration impact of drilling and blasting construction, the disturbance impact of shield tunneling, etc.

[0007] In view of this, we propose a test device and method for the anti-dispersion of grouting materials in water that can simulate complex geological conditions, overcome the shortcomings of the existing technology, and achieve a comprehensive and accurate evaluation of the anti-dispersion performance of grouting materials in water. Summary of the invention

[0008] The purpose of the present invention is to provide a grouting material anti-dispersion test device in water and a method of use to solve the problems raised in the above background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A grouting material anti-dispersion test device in water comprises a base and a constant temperature water bath arranged on one side of the base, a water pump, a scouring tank and a sedimentation tank are arranged on the surface of the base, and the constant temperature water bath, the water pump, the scouring tank and the sedimentation tank are connected in sequence through water pipes; vibrators for simulating external loads and disturbances are arranged on both sides of the scouring tank; a filter net for intercepting scouring residues is arranged in the sedimentation tank.

[0011] As a further solution of the present invention: the constant temperature water bath is provided with a temperature control system, and the temperature control system is used to adjust and maintain the water temperature in the constant temperature water bath.

[0012] As a further solution of the present invention: a plurality of water flow relief plates are provided in the inner cavity of the scouring trough near the water inlet end, and the water flow relief plates are used to adjust the impact force of the water flow.

[0013] As a further solution of the present invention: a sample tank is provided in the middle of the inner cavity of the flushing tank, which is equidistantly arranged with the blade of the stirrer as the center.

[0014] As a further solution of the present invention: one side of the water head monitoring device is connected to a data processing and display system through a seal, and the data processing and display system is used to calculate the external insertion angle of the pipe-roof steel pipe.

[0015] A method for using a grouting material anti-dispersion test device in water, the method for using the grouting material anti-dispersion test device in water being applicable to the grouting material anti-dispersion test device in water according to any one of claims 1 to 5, comprising the following steps:

[0016] S1. Conduct static water anti-dispersion test;

[0017] S2. Conduct dynamic water scour resistance test;

[0018] S3, collect and analyze data;

[0019] S4. Analyze the test results.

[0020] As a further solution of the present invention: Step S1 comprises:

[0021] S1.1. Block the water inlet and outlet of the scouring tank, and inject pure water into the scouring tank so that the water surface covers the top surface of the sample tank to form a static water condition;

[0022] S1.2. Pour the slurry from the water surface into the sample tank. After the slurry reaches the initial setting time, take an appropriate amount of water sample from the top of the sample tank for turbidity test;

[0023] S1.3. Compare the anti-dispersion properties of different grouting materials in static water through turbidity analysis.

[0024] As a further solution of the present invention: step S2 comprises:

[0025] S2.1. Clean the flushing tank, install and connect each device in turn, inject an appropriate amount of water into the constant temperature water bath, and adjust the water temperature to the constant temperature required for the test through the temperature control system;

[0026] S2.2, start the pump to extract the water in the constant temperature water bath through the pipe and enter the scouring tank and the sedimentation tank in turn. After a stable water cycle is formed, block the water inlet and outlet of the scouring tank and the sedimentation tank and turn off the pump. Inject slurry into the sample tank. After the slurry reaches the initial setting time, open the water inlet and outlet and the pump again to form a circulating water flow;

[0027] S2.3. After the circulating water flow is stable, start the agitator to stir the water flow in the flushing tank to simulate a complex dynamic water environment. By adjusting the speed of the agitator, change the flow rate and direction of the water flow near the sample tank;

[0028] S2.4, start the vibration exciter, set different loads and loading frequencies according to the working conditions, and simulate external loads such as blasting vibration, shield tunneling disturbance, and vehicle-induced vibration in the drilling and blasting construction;

[0029] S2.5. Set the flushing test time according to the test requirements and use a camera to observe and record the changes of the sample during the flushing process.

[0030] As a further solution of the present invention: step S3 comprises:

[0031] S3.1. After flushing, take the sample out of the sample tank, use an electronic scale to measure the mass of the sample after flushing, and compare it with the mass before flushing to obtain the retention rate of the sample;

[0032] S3.2. Collect the scouring residues in the sedimentation tank and conduct particle analysis to understand its particle size distribution and composition;

[0033] S3.3. Record the turbidity in static water, the mass change and structural change of the sample after dynamic water flushing, and evaluate the anti-dispersion performance of the grouting material under complex geological conditions based on the test data.

[0034] As a further solution of the present invention: in step S4, the best grouting material ratio is determined by comparing and analyzing the results of different grouting materials under different test conditions.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The device for testing the anti-dispersion of grouting materials in water can reproduce the groundwater flow and construction disturbance environment under laboratory conditions by setting up an agitator and a vibrator. The agitator rotates the water and the vibrator vibrates the water, providing reliable data support, and providing a scientific basis and guidance for the safety and stability of grouting construction in geotechnical and underground engineering projects, so as to design the best proportion of grouting materials according to local conditions. At the same time, a filter net is set to intercept the scouring residue, and the residue after scouring is collected in the sedimentation tank to prevent backflow from clogging the device and affecting the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 It is an expanded view of the scouring tank structure of the present invention;

[0039] Figure 3 It is a schematic diagram of the sedimentation tank structure of the present invention;

[0040] Figure 4 The present invention is a flow chart of the anti-dispersion test method of the grouting material in water.

[0041] The meaning of each number in the figure is:

[0042] 10. Base; 20. Constant temperature water bath; 30. Water pump; 40. Flushing tank; 41. Water flow relief plate; 42. Sample tank; 43. Agitator; 44. Vibrator; 50. Sedimentation tank; 51. Filter. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Example

[0045] like Figure 1 - Figure 3 As shown, this embodiment provides a grouting material anti-dispersion test device in water, comprising: a base 10 and a constant temperature water bath 20 arranged on one side of the base 10, wherein:

[0046] The base 10 is used to place and fix the water pump 30 , the flushing tank 40 and the sedimentation tank 50 , so that the water pump 30 , the flushing tank 40 and the sedimentation tank 50 form a height difference with the constant temperature water bath 20 , thereby facilitating the circulation of water flow.

[0047] The constant temperature water bath 20 is provided with a temperature control system. After injecting an appropriate amount of water into the constant temperature water bath 20 according to the overall circulating water volume of the device, the water temperature is adjusted to the constant temperature required for the test through the temperature control system, thereby simulating the temperature of groundwater. The temperature control system of the constant temperature water bath 20 can accurately adjust the water temperature to ensure that the water temperature is constant during the test.

[0048] The water pump 30 connects the constant temperature water bath 20 and the flushing tank 40 through a water pipe. It is necessary to ensure that the water pipe is firmly connected to prevent water leakage. In order to enhance the durability of the water pipes connecting the devices and simulate the groundwater environment containing corrosive ions, the connecting water pipes in the test are made of acid- and alkali-resistant fluororubber pipes, and rubber sealing sleeves are set at the joints to ensure the sealing of the connection between the devices.

[0049] The water flow relief plate 41 and the sample slot 42 inside the scouring trough 40 are installed and fixed through a reserved card slot; the water flow relief plate 41 is installed near the inner cavity of the scouring trough 40 near the water inlet end, and the water flow impact force is adjusted by adjusting the height of the water flow relief plate 41, so that the water flow flows through the sample slot 42 evenly and stably; at the same time, in order to improve the accuracy of the test results, four groups of sample slots 42 are symmetrically arranged along the edge in the middle of the scouring trough 40;

[0050] A stirrer 43 is installed on the top of the scouring tank 40. The stirrer 43 includes a motor and a fan blade fixed to the motor output shaft. A fixing plate is provided between the motor and the fan blade. The fan blade of the stirrer 43 is located at the center of the four groups of sample tanks 42. The speed of the fan blade is adjusted by adjusting the speed of the motor, and the rotation of the fan blade drives the water to move, thereby simulating a complex dynamic water environment.

[0051] Vibrators 44 are provided on both sides of the scouring trough 40. The vibrators 44 are used to simulate external disturbances that may occur during the construction process and later operation, such as blasting vibrations during drilling and blasting construction, shield tunneling disturbances, and later vehicle-induced vibration loads.

[0052] One end of the sedimentation tank 50 is connected to the flushing tank 40 through a water pipe, and the other end is connected to the constant temperature water bath 20 through a water pipe. A filter screen 51 is installed in the sedimentation tank 50. The flushing residue is intercepted by the filter screen 51, and the flushed residue is collected in the sedimentation tank 50 to prevent backflow from clogging the device and affecting the test results.

[0053] It should be further explained that the scouring tank 40, the sample tank 42 and the sedimentation tank 50 are all made of organic glass acrylic materials, so as to observe and record the changes in water turbidity and the anti-dispersion and fluidity of the slurry in static and dynamic water during the test.

[0054] like Figure 4 As shown in the above embodiment, the method for using the grouting material water anti-dispersion test device includes the following steps:

[0055] S1. Conduct static water anti-dispersion test;

[0056] S2. Conduct dynamic water scour resistance test;

[0057] S3, collect and analyze data;

[0058] S4. Analyze the test results.

[0059] Wherein step S1, performing a static water anti-dispersion test comprises:

[0060] S1.1. Block the water inlet and outlet of the scouring tank 40, and inject pure water into the scouring tank 40 so that the water surface is above the top surface of the sample tank 42 to form a static water condition;

[0061] S1.2, slowly pour the slurry to be tested from the water surface into the sample tank 42, and after the slurry reaches the initial setting time determined in advance, take a proper amount of water sample above the sample tank 42 for turbidity test. The turbidity test is performed using a portable turbidity tester, which uses the 90° scattered light principle for turbidity test;

[0062] S1.3. Compare the anti-dispersion properties of different grouting materials in static water through turbidity analysis.

[0063] Step S2, performing a dynamic water scour resistance test comprises:

[0064] S2.1. Clean the flushing tank 40, install and connect each device in turn, inject an appropriate amount of water into the constant temperature water bath 20, and configure the water sample according to the actual corrosive ion composition of the groundwater in the project. Adjust the water temperature to the constant temperature required for the test through the temperature control system;

[0065] S2.2, start the pump 30, so that the water in the constant temperature water bath 20 is extracted through the pipeline, and enters the scouring tank 40 and the sedimentation tank 50 in turn. After a stable water cycle is formed, the water inlet and outlet of the scouring tank 40 and the sedimentation tank 50 are blocked and the pump 30 is turned off, and the slurry is injected into the sample tank 42. After the slurry reaches the initial setting time, the water inlet and outlet and the pump 30 are opened again to form a circulating water flow;

[0066] S2.3. After the circulating water flow is stable, start the agitator 43 to stir the water flow in the flushing tank 40 to simulate a complex dynamic water environment. By adjusting the rotation speed of the agitator 43, the flow velocity and flow direction of the water flow near the sample tank 42 are changed; at the same time, it also plays a role in increasing the groundwater pressure of the sample. Specifically, according to the groundwater pressure in the actual project, the fluid mechanics numerical simulation software can be used to establish the experimental model. At a specified flow rate, the motor speed is used as a variable to calculate the pressure on the sample surface in the sample tank at different speeds. The statistical simulation calculation results are fitted to fit the relationship between the motor speed and the water pressure on the specimen to determine the speed required in the test;

[0067] S2.4. Start the vibrator 44 to simulate external disturbances that may occur during the construction process, such as blasting vibrations during drilling and blasting construction, and disturbances caused by shield tunneling. If a scouring durability test is conducted, external loads such as vehicle-induced vibrations in the later stage can also be simulated to provide a more realistic simulation environment. The size and frequency of the load applied by the vibrator 44 need to be determined based on the parameters measured on site. For example, when simulating the disturbances caused by drilling and blasting construction and shield tunneling in the early stage, the vibration frequency and amplitude of the vibrator can be set based on the vibration velocity and frequency measured on site. Vehicle-induced vibrations are usually generated by train vibration loads in railway or subway tunnels. Therefore, they can be represented by the superposition of static loads and sine functions based on the train formation and design speed through the empirical formula fitting method. The wavelength and arrow height in the sine function are obtained by querying the track unevenness management value. By querying the train crews during operation, taking the tunnel design service time of 100 years as the standard, the total number of times vehicle-induced vibration loads are applied during the 100-year service life of the tunnel can be obtained.

[0068] S2.5. According to the test requirements, if it is a railway or subway tunnel, the vibration caused by the construction disturbance during the construction period and all vehicle-induced vibrations during the service life of the tunnel need to be set according to the actual measurement situation. The total vibration time is obtained from the vibration frequency and the total number of times. The load is applied twice to achieve full-time simulation during construction and operation. If it is a non-railway tunnel, only the disturbance effect during the construction period needs to be set. Set the same scouring test time according to the vibration time, and use a camera to observe and record the changes of the sample during the scouring process.

[0069] Step S3, data collection and analysis includes:

[0070] S3.1. After flushing is completed, the sample is taken out from the sample tank 42, and the mass of the sample after flushing is measured using an electronic scale, and compared with the mass before flushing to obtain the retention rate of the sample;

[0071] S3.2, collecting the scouring residues in the sedimentation tank 50, and performing particle analysis to understand the particle size distribution and component composition;

[0072] S3.3. Record the turbidity in static water, the mass change and structural change of the sample after dynamic water flushing, and evaluate the anti-dispersion performance of the grouting material under complex geological conditions based on the test data.

[0073] Step S4, analyzing the test results includes:

[0074] By comparing and analyzing the results of different grouting materials under different test conditions, such as different flow rates, different temperatures, different external disturbance conditions, etc., the optimal grouting material ratio can be obtained, and the main factors affecting the anti-dispersion performance of grouting materials can be summarized to provide a basis for optimizing the ratio and construction process of grouting materials, so as to design the best ratio of grouting materials according to local conditions.

[0075] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0076] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A grouting material anti-dispersion test device in water, comprising a base (10) and a constant temperature water bath (20) arranged on one side of the base (10), wherein a water pump (30), a flushing tank (40) and a sedimentation tank (50) are arranged on the surface of the base (10), characterized in that: The constant temperature water bath (20), the water pump (30), the flushing tank (40) and the sedimentation tank (50) are connected in sequence through water pipes; vibrators (44) for simulating external loads and disturbances are provided on both sides of the flushing tank (40); and a filter screen (51) for intercepting flushing residues is provided in the sedimentation tank (50).

2. The grouting material anti-dispersion test device in water according to claim 1, characterized in that: The constant temperature water bath (20) is provided with a temperature control system, and the temperature control system is used to adjust and maintain the water temperature in the constant temperature water bath (20).

3. The grouting material anti-dispersion test device in water according to claim 1, characterized in that: The inner cavity of the scouring trough (40) is provided with a plurality of water flow relief plates (41) near the water inlet end, and the water flow relief plates (41) are used to adjust the impact force of the water flow.

4. The grouting material anti-dispersion test device in water according to claim 1, characterized in that: A stirrer (43) for stirring water flow is provided in the middle of the flushing trough (40). The stirrer (43) comprises a motor and a fan blade fixed to the output shaft of the motor, and a fixing plate is provided between the motor and the fan blade.

5. The grouting material anti-dispersion test device in water according to claim 4, characterized in that: The middle part of the inner cavity of the flushing tank (40) is provided with sample tanks (42) which are arranged at equal distances with the blades of the stirrer (43) as the center.

6. A method for using a grouting material anti-dispersion test device in water, the method for using is applicable to the grouting material anti-dispersion test device in water according to any one of claims 1 to 5, characterized in that: The following steps are included: S1. Conduct static water anti-dispersion test; S2. Conduct dynamic water scour resistance test; S3, collect and analyze data; S4. Analyze the test results.

7. The method for using the grouting material anti-dispersion test device in water according to claim 6, characterized in that: The step S1 comprises: S1.

1. Block the water inlet and outlet of the scouring trough (40), and inject pure water into the scouring trough (40) so that the water surface is above the top surface of the sample trough (42), thereby forming a static water condition; S1.2, pour the slurry from the water surface into the sample tank (42), and after the slurry reaches the initial setting time, take an appropriate amount of water sample from the top of the sample tank (42) for turbidity test; S1.

3. Compare the anti-dispersion properties of different grouting materials in static water through turbidity analysis.

8. The method for using the grouting material anti-dispersion test device in water according to claim 6, characterized in that: The step S2 comprises: S2.

1. Clean the flushing tank (40), install and connect each device in sequence, inject an appropriate amount of water into the constant temperature water bath (20), and adjust the water temperature to the constant temperature required for the test through the temperature control system; S2.2, start the water pump (30) to extract water from the constant temperature water bath (20) through the pipeline and enter the flushing tank (40) and the sedimentation tank (50) in turn. After a stable water cycle is formed, the water inlet and outlet of the flushing tank (40) and the sedimentation tank (50) are blocked and the water pump (30) is turned off. The slurry is injected into the sample tank (42). After the slurry reaches the initial setting time, the water inlet and outlet and the water pump (30) are turned on again to form a circulating water flow. S2.3, after the circulating water flow is stable, start the agitator (43) to stir the water flow in the flushing tank (40) to simulate a complex dynamic water environment, and change the flow velocity and flow direction of the water flow near the sample tank (42) by adjusting the rotation speed of the agitator (43); S2.4, start the vibration exciter (44), set different loads and loading frequencies according to the working conditions, and simulate external loads such as blasting vibration, shield tunneling disturbance, and later vehicle-induced vibration in drilling and blasting construction; S2.

5. Set the flushing test time according to the test requirements and use a camera to observe and record the changes of the sample during the flushing process.

9. The method for using the grouting material anti-dispersion test device in water according to claim 6, characterized in that: The step S3 comprises: S3.

1. After flushing is completed, the sample is taken out from the sample tank (42), and the mass of the sample after flushing is measured using an electronic scale, and compared with the mass before flushing to obtain the retention rate of the sample; S3.2, collecting the scouring residues in the sedimentation tank (50), and performing particle analysis to understand the particle size distribution and component composition; S3.

3. Record the turbidity in static water, the mass change and structural change of the sample after dynamic water flushing, and evaluate the anti-dispersion performance of the grouting material under complex geological conditions based on the test data.

10. The method for using the grouting material anti-dispersion test device in water according to claim 6, characterized in that: In step S4, the best grouting material ratio is determined by comparing and analyzing the results of different grouting materials under different test conditions.

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