A disassembly test device for testing the anti-scouring performance of grouting materials under dynamic water action

Abstract

The present invention discloses a detachable test device for testing the anti-scouring performance of grouting materials under the action of dynamic water, the detachable test device for testing the anti-scouring performance comprises a dynamic water supply unit, a test water tank unit and a wastewater circulation unit, wherein: the dynamic water supply unit is connected to the test water tank unit to provide it with dynamic water of different flow rates, the wastewater flowing out of the test water tank unit enters the wastewater circulation unit, and the wastewater circulation unit is connected to the dynamic water supply unit through a return pipe. The grouting material anti-scouring performance test device of the present invention can simulate the anti-dispersion performance of dynamic water grouting materials under different flow rates, and a detachable test plate is designed, which can simulate the roughness of different grouting environment formations by adjusting the density and height of the synapse. And the mass of the detachable test plate can be directly measured at the end of the test to reduce the measurement error of the slurry retention rate test. In addition, a multi-pass filtration wastewater circulation device is designed to efficiently utilize the test water.

Description

Technical Field

[0001] The invention belongs to the field of geotechnical engineering, and relates to a dynamic water scour resistance test device, and in particular to a detachable test device for testing the scour resistance performance of grouting materials under dynamic water action. Background Art

[0002] With the increasing development of domestic cities, serious disasters such as sudden water inrush are often encountered during the construction of underground projects. Grouting is an effective method to deal with sudden water inrush under conditions of relatively small disturbances, but conventional cement-based grouting materials have high water seepage rate and poor water dispersion resistance, and cannot resist water scouring, making it difficult to achieve the expected results. In view of this, anti-dispersion dynamic water grouting materials that can resist water scouring, effectively intercept slurry, and block groundwater need to be further developed.

[0003] In the process of developing anti-dispersion dynamic water grouting materials, testing the material's anti-dynamic water scouring performance is an important part. However, the current relevant specifications only stipulate the anti-dispersion performance test method of grouting materials under static water, and there is no complete set of indoor test equipment for scientifically evaluating the basic performance of grouting materials' anti-scouring and slurry retention rate under dynamic water conditions in underground engineering. Therefore, it is necessary to develop a set of anti-dynamic water scouring test equipment for slurry anti-scouring and slurry retention rate testing, so as to provide necessary test equipment for the research and development of anti-dispersion dynamic water grouting materials. Summary of the invention

[0004] In order to overcome the shortcomings and defects in the prior art, the present invention provides a detachable test device for testing the anti-scouring performance of grouting materials under the action of dynamic water. The device can accurately test the anti-scouring performance and slurry retention rate of dynamic water grouting materials under dynamic water conditions of different flow rates. The method is simple and convenient for indoor testing.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A disassembly test device for testing the anti-scouring performance of grouting materials under dynamic water action, comprising a dynamic water supply unit, a test water tank unit and a wastewater circulation unit, wherein:

[0007] The dynamic water supply unit is connected to the test water tank unit to provide it with dynamic water of different flow rates, and the wastewater flowing out of the test water tank unit enters the wastewater circulation unit, and the wastewater circulation unit is connected to the dynamic water supply unit through a return pipe;

[0008] The dynamic water supply unit comprises a water tank, a first water pump and a uniform flow rate box, the water tank is connected to the first water pump through a first water pipe, and the first water pump is connected to the uniform flow rate box through a second water pipe;

[0009] The test water tank unit comprises a water tank, a detachable test plate and a mobile casting assembly, the moving water flows into the water tank through a uniform flow rate box, the mobile casting assembly is placed above the water tank, and the detachable test plate is placed on the water tank and below the mobile casting assembly;

[0010] The wastewater circulation unit includes a first screen, a wastewater tank, a second screen and a second water pump. The first screen is placed at the end of the water tank. The wastewater flows into the wastewater tank after being filtered by the first screen. The wastewater tank is provided with a second screen. The wastewater tank is connected to the second water pump, and the second water pump is connected to the water tank through a return pipe.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] The grouting material anti-scouring performance test device of the present invention can simulate the anti-dispersion performance of dynamic water grouting materials under different flow rates. A detachable test plate is designed, and the roughness of the strata in different grouting environments can be simulated by adjusting the density and height of the synapse. The mass of the detachable test plate can be directly measured at the end of the test to reduce the measurement error of the slurry retention rate test. In addition, a multi-pass filtration wastewater circulation device is designed to efficiently utilize the test water. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the assembled disassembly test device for testing the anti-scour performance of grouting materials under the action of dynamic water according to the present invention.

[0014] Figure 2 for Figure 1 Schematic diagram of the reclaimed water baffle structure.

[0015] Figure 3 for Figure 1 Top view of the sink without the removable test plate.

[0016] Figure 4 for Figure 1 Top view of the sink with removable test plate.

[0017] Figure 5 This is the front view of the detachable test board. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below in conjunction with the accompanying drawings, but is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be included in the protection scope of the present invention.

[0019] The present invention provides a disassembly test device for testing the anti-scouring performance of grouting materials under the action of dynamic water. Figure 1 As shown, the device includes a dynamic water supply unit, a test water tank unit and a wastewater circulation unit, wherein:

[0020] The dynamic water supply unit is connected to the test water tank unit to provide it with dynamic water of different flow rates, and the wastewater flowing out of the test water tank unit enters the wastewater circulation unit, and the wastewater circulation unit is connected to the dynamic water supply unit through a return pipe;

[0021] The dynamic water supply unit comprises a water tank 1, a first water pump 3 and a uniform flow rate box 5. The water tank 1 is connected to the first water pump 3 through a first water pipe 2. The first water pump 3 can adjust the water pressure through a first water pump regulating valve 22. The first water pump 3 is connected to the uniform flow rate box 5 through a second water pipe 4.

[0022] The uniform flow box 5 is provided with a water baffle 6 with filter holes 17. The uniform flow box 5 maintains a uniform dynamic water flow rate through the water baffle 6 with filter holes 17. A flow rate monitor 7 is provided on the water baffle 6 to monitor the dynamic water flow rate during the test process.

[0023] There are two water baffles 6, and a filter hole 17 is provided on one side of each water baffle 6. The filter hole 17 occupies half of the area of ​​the water baffle 6. The two water baffles 6 are inverted in the uniform flow box 7.

[0024] The test water tank unit is composed of a water tank 8, a detachable test plate 19 and a mobile casting assembly, and the moving water flows into the water tank 8 through a uniform flow rate box 5;

[0025] The water tank 8 is a hollow structure, and interface grooves 18 are provided at both ends of the hollow structure;

[0026] The two ends of the detachable test board 19 are provided with trapezoidal interfaces, and the detachable test board 19 can be connected to the interface groove 18 of the water tank 8 through the trapezoidal interfaces and placed on the water tank 8;

[0027] The detachable test plate 19 is provided with a synapse 20, and the roughness of the stratum in the karst grouting environment is simulated by adjusting the density and height of the synapse 20. In addition, when detecting the slurry retention rate, the mass of the remaining slurry on the test plate needs to be measured. The fixed test plate needs to scrape off the slurry to measure the slurry mass. In this way, the fixed test plate will have residual slurry affecting the measurement accuracy, while the detachable test plate 19 can be directly measured after being removed, reducing the measurement error;

[0028] The mobile pouring assembly is placed above the water tank 8 and can be used to pour the test slurry 12 into the water tank 8;

[0029] The mobile pouring assembly includes a funnel 9, a slurry raft 10 and a mobile bracket 11. The mobile bracket 11 is placed on the wall of the water tank 8, the funnel 9 is fixed on the mobile bracket 11, and the slurry raft 10 controls the fall of the slurry at the bottom of the funnel;

[0030] The wastewater circulation unit comprises a first screen 13, a wastewater tank 14, a second screen 21 and a second water pump 15. The first screen 13 is placed at the end of the water tank 8, the screen diameter is 2 mm, and the sand washed out of the mud is screened out; the filtered wastewater flows into the wastewater tank 14, and a second screen 21 is arranged on the wastewater tank 14, the screen diameter is 0.075 mm, and the large particles washed out of the slurry can be screened out; the wastewater tank 14 is connected to the second water pump 15, and the second water pump 15 is connected to the water tank 1 through the return pipe 16, and the filtered wastewater is input into the water tank 1 through the second water pump 15 to complete the wastewater circulation.

[0031] The test steps for testing dynamic water grouting materials using the above device are as follows:

[0032] Step 1: Use the drilling method and magnetic resonance to detect the conditions of the stratum to be injected in the tunnel karst dynamic water grouting project, clarify the dynamic water flow rate and roughness of the stratum to be injected, prepare a detachable test plate with corresponding synapses to simulate the roughness of the stratum to be injected, and the mass of the detachable test plate prepared for the test is m1;

[0033] Step 2: Build a detachable test device for anti-scour performance testing, place the detachable test plate at the interface groove of the water tank, and prepare the grouting slurry to be tested;

[0034] Step 3: Place the grouting slurry to be tested with a mass of m2 in the funnel, and the leaking slurry raft is in a closed state; turn on the first water pump, adjust the regulating valve of the first water pump so that the flow rate displayed on the flow rate monitoring meter is the same as the dynamic water flow rate of the formation to be injected, and then turn on the second water pump to start the wastewater circulation;

[0035] Step 4: Open the grouting raft to allow the grouting slurry to leak into the detachable test plate and start the test;

[0036] Step 5: You can set different test times such as 10min, 30min and 60min. When the set test time is reached, turn off the first water pump and the second water pump, remove the detachable test board, and measure its mass m3;

[0037] Step 6: Calculate and record the slurry retention rate of the grouting slurry according to the formula k (slurry retention rate) = (m3-m1) / m2, thus completing the slurry retention rate test of the grouting slurry.

Claims

1. A disassembly test device for testing the anti-scouring performance of grouting materials under dynamic water, characterized in that The anti-scour performance test detachable test device comprises a dynamic water supply unit, a test water tank unit and a wastewater circulation unit, wherein: The dynamic water supply unit is connected to the test water tank unit to provide it with dynamic water of different flow rates, and the wastewater flowing out of the test water tank unit enters the wastewater circulation unit, and the wastewater circulation unit is connected to the dynamic water supply unit through a return pipe; The dynamic water supply unit comprises a water tank, a first water pump and a uniform flow rate box, the water tank is connected to the first water pump through a first water pipe, and the first water pump is connected to the uniform flow rate box through a second water pipe; The test water tank unit comprises a water tank, a detachable test plate and a mobile casting assembly, the moving water flows into the water tank through a uniform flow rate box, the mobile casting assembly is placed above the water tank, and the detachable test plate is placed on the water tank and below the mobile casting assembly; The wastewater circulation unit includes a first screen, a wastewater tank, a second screen and a second water pump. The first screen is placed at the end of the water tank. The wastewater flows into the wastewater tank after being filtered by the first screen. The wastewater tank is provided with a second screen. The wastewater tank is connected to the second water pump, and the second water pump is connected to the water tank through a return pipe.

2. The disassembly test device for testing the anti-scouring performance of grouting materials under dynamic water according to claim 1 is characterized in that A water baffle with filter holes is arranged in the uniform flow rate box.

3. The disassembly test device for testing the anti-scouring performance of grouting materials under dynamic water according to claim 2 is characterized in that A flow rate monitor is arranged on the water baffle to monitor the dynamic water flow rate during the test process.

4. The disassembly test device for testing the anti-scouring performance of grouting materials under dynamic water according to claim 2 or 3, characterized in that There are two water baffles, one side of each water baffle is provided with filter holes, and the two water baffles are inverted with each other in the uniform flow rate box.

5. The disassembly test device for testing the anti-scouring performance of grouting materials under dynamic water according to claim 4 is characterized in that The filter holes occupy half of the area of ​​the water baffle.

6. The detachable test device for testing the anti-scouring performance of grouting materials under dynamic water action according to claim 1 is characterized in that The water tank is a hollow structure, and interface grooves are arranged at both ends of the hollow structure; trapezoidal interfaces are arranged at both ends of the detachable test board, and the detachable test board is connected to the interface grooves of the water tank through the trapezoidal interfaces and placed on the water tank.

7. The disassembly test device for testing the anti-scouring performance of grouting materials under dynamic water according to claim 1 or 6, characterized in that The detachable test board is provided with a synapse.

8. The disassembly test device for testing the anti-scouring performance of grouting materials under dynamic water according to claim 1 is characterized in that The mobile pouring assembly comprises a funnel, a slurry raft and a mobile bracket. The mobile bracket is placed on the wall of the water tank, the funnel is fixed on the mobile bracket, and the slurry raft is arranged at the bottom end of the funnel.

9. The disassembly test device for testing the anti-scouring performance of grouting materials under dynamic water action according to claim 1 is characterized in that The diameter of the first screen is 2 mm, and the diameter of the second screen is 0.075 mm.

10. A method for testing dynamic water grouting materials using the detachable test device for testing the anti-scouring performance of grouting materials under dynamic water action as described in any one of claims 1 to 9, characterized in that The method comprises the following steps: Step 1: Use the drilling method and magnetic resonance to detect the conditions of the stratum to be injected in the tunnel karst dynamic water grouting project, clarify the dynamic water flow rate and roughness of the stratum to be injected, prepare a detachable test plate with corresponding synapses to simulate the roughness of the stratum to be injected, and the mass of the detachable test plate prepared for the test is m1; Step 2: Build a detachable test device for anti-scour performance testing, place the detachable test plate at the interface groove of the water tank, and prepare the grouting slurry to be tested; Step 3: Place the grouting slurry to be tested with a mass of m2 in the funnel, and the leaking slurry raft is in a closed state; turn on the first water pump, adjust the regulating valve of the first water pump so that the flow rate displayed on the flow rate monitoring meter is the same as the dynamic water flow rate of the formation to be injected, and then turn on the second water pump to start the wastewater circulation; Step 4: Open the grouting raft to allow the grouting slurry to leak into the detachable test plate and start the test; Step 5: You can set different test times such as 10min, 30min and 60min. When the set test time is reached, turn off the first water pump and the second water pump, remove the detachable test board, and measure its mass m3; Step 6: Calculate and record the slurry retention rate of the grouting slurry according to the formula k=(m3-m1) / m2, that is, complete the slurry retention rate test of the grouting slurry, where k is the slurry retention rate.

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