Test method for flow properties of gangue powder slurry for overburden isolation grouting

Abstract

The present invention discloses a method for testing the flow properties of gangue powder slurry for grouting filling of overburden isolation, which belongs to the field of green mining of mining engineering. Sedimentation rate is the main flow property of gangue powder slurry. The corresponding sedimentation rates of filling slurries with different particle size ranges and different water-cement ratios are obtained through sedimentation rate testing, and the water-cement ratio and sedimentation rate data under each particle size range are matched one by one, and a functional relationship such as y=a ln(x)+b is obtained. The relationship between the water-cement ratio and the sedimentation rate of the gangue powder slurry under one of the particle size ranges is obtained, so as to obtain the relationship between the water-cement ratio and the sedimentation rate under each particle size range. The functional relationship can be used to calculate the sedimentation rates corresponding to various water-cement ratios of the gangue powder slurry under each particle size range. This test method is perfect and has the advantages of testing the sedimentation rate of a gangue powder slurry and obtaining the sedimentation rate of the slurry under various states of the gangue powder.

Description

Technical Field

[0001] The invention relates to a method for testing the flow properties of gangue powder slurry, and is particularly suitable for a method for testing the flow properties of gangue powder slurry for overburden isolation grouting filling, and belongs to the field of green mining in mining engineering. Background Art

[0002] Buildings compressing coal has always been a major technical problem that has plagued coal mining in my country. The total amount of coal compressed is nearly 10 billion tons, and the eastern mining area even exceeds 50% of the total reserves. It is a sharp contradiction between resource development in mining areas and a harmonious living environment. Underground coal mining can cause surface collapse, soil erosion, economic losses and environmental damage. Mining coal compressed under buildings is of great significance for liberating coal resources, alleviating the contradiction between resource development and human settlement, and protecting the environment.

[0003] Overburden isolation grouting filling technology is an important construction underpressure coal mining technology. It has the advantages of no interference between mining and filling, low tunnel excavation rate, and low filling cost per ton of coal, and has been widely recognized and applied. This technology makes gangue powder into slurry, and has very high requirements for the flow properties of gangue powder slurry. Sedimentation rate is the main flow property of gangue powder slurry, but the test method for sedimentation rate is not mature, and there is no special test system, so it is difficult to test gangue powder slurry on a large scale. Therefore, it is necessary to study a test method for the flow properties of gangue powder slurry for overburden isolation grouting filling, so as to test the flow properties of gangue powder slurry and screen out the gangue powder slurry that can be used. Summary of the invention

[0004] Technical problem: In order to solve the existing technical problems, the present invention provides a method for testing the flow properties of gangue powder slurry for overburden isolation grouting filling with high stability and simple operation.

[0005] Technical solution: To achieve the above purpose, the present invention provides a method for testing the flow properties of gangue powder slurry for overburden isolation grouting, and the steps are as follows:

[0006] First, select the gangue powder to be used for filling slurry, which should be kept in a non-wet state. Then, place the gangue powder in a metal non-magnetic disk and dry it in a drying oven at 105°C for 6-10 hours to completely dry the gangue powder to ensure the accuracy of the water-cement ratio in the test.

[0007] The gangue powder was sieved with 60 mesh, 100 mesh, 200 mesh and 325 mesh square hole sieves respectively to obtain gangue powder with five particle size ranges, namely, particle size ≥ 60 mesh, 60 mesh> particle size ≥ 100 mesh, 100 mesh> particle size ≥ 200 mesh, 200 mesh> particle size ≥ 325 mesh and particle size < 325 mesh; gangue powder with different particle size ranges was used to prepare a variety of filling slurries with different water-cement ratios, the water-cement ratio of the slurry ranged from 0.6 to 2, with an interval of 0.2, and from 2 to 6, with an interval of 1, and the gangue powder with five different particle size ranges was used to prepare the filling slurries with the above 12 water-cement ratios, a total of 60 different filling slurries, wherein each filling slurry with the same particle size and the same water-cement ratio was prepared in 3 groups, and the difference between each group did not exceed 5%, for use in detecting the flow property data of the filling slurries with different particle sizes and different water-cement ratios;

[0008] The main flow property of gangue powder slurry is the sedimentation rate. Therefore, the corresponding sedimentation rates of filling slurries with different particle size ranges and different water-cement ratios are obtained through sedimentation rate tests, and the water-cement ratio and sedimentation rate data are corresponded one by one in each particle size range. The water-cement ratio and sedimentation rate data are fitted through the origin software to obtain a functional relationship such as y=aln(x)+b, where a and b are constants that vary with different experimental parameters. This formula is the relationship between the water-cement ratio and the sedimentation rate of the gangue powder slurry in one of the particle size ranges, thereby obtaining the relationship between the water-cement ratio and the sedimentation rate in each particle size range. Through this functional relationship, the sedimentation rates corresponding to various water-cement ratios of the gangue powder slurry in each particle size range can be calculated.

[0009] When mixing according to the water-cement ratio, since too much or too little water is not conducive to the test, 500g of water is used to prepare the gangue powder slurry using 5 kinds of gangue powder in the particle size range; first, the sedimentation rate test starts with the slurry with a particle size ≥60 mesh and a water-cement ratio of 6, using 500g of water and 83.3g of gangue powder to prepare and test. After the test, start to prepare the water-cement ratio of 5, 500g of water, and 100g of gangue powder. At this time, there is no need to re-prepare the slurry. Just add 100g-83.3g=16.7g of gangue powder of the same particle size to the slurry with a water-cement ratio of 6, that is, to achieve a slurry water-cement ratio of 5, and then use a glass rod to stir again to restore the slurry to the state before precipitation, and use a rubber-tipped dropper to suck out the excess slurry; prepare other slurries with smaller water-cement ratios in the same way for testing, thereby saving the preparation time of the gangue powder slurry.

[0010] By testing the particle size range of the gangue powder with the maximum particle size within 2mm, the sedimentation rate of the gangue powder slurry can be calculated by weighting the proportion of different particle size ranges. The gangue is ground into gangue powder I, and the relationship between the water-cement ratio and the sedimentation rate in different particle size ranges is: particle size ≥60 mesh y1=a1ln(x1)+b1, 60 mesh>particle size ≥100 mesh y2=a2ln(x2)+b2, 100 mesh>particle size ≥200 mesh y3=a3ln(x3)+b3, 200 mesh>particle size ≥325 mesh y4=a4l n(x4)+b4, particle size <325 mesh y5=a5ln(x5)+b5; grind the gangue into gangue powder II, among which particle size ≥60 mesh accounts for 5%, 60 mesh>particle size ≥100 mesh accounts for 10%, 100 mesh>particle size ≥200 mesh accounts for 40%, 200 mesh>particle size ≥325 mesh accounts for 30%, and particle size <325 mesh accounts for 15%. Then the sedimentation rate of the slurry of gangue powder II at a certain water-cement ratio is y=y1×5%+y2×10%+y3×40%+y4×30%+y5×15%.

[0011] Use origin software to fit the relationship between the water-cement ratio and sedimentation rate obtained from the test. The correlation coefficient between the two must be greater than or equal to 95%. If it is less than 95%, the data with a large degree of deviation will be retested.

[0012] A method for testing the flow properties of gangue powder slurry for overburden isolation grouting filling, the testing system used comprises a main frame, and a test platform and a storage area are respectively arranged on the main frame;

[0013] The storage area includes a plurality of neatly arranged measuring cylinder holders, each of which is provided with a measuring cylinder to be used and a space for accommodating a plurality of spare measuring cups, and drawers for storage are provided at the edges of the neatly arranged measuring cylinder holders, and handles are provided on both sides of the holders;

[0014] The test platform comprises a drain plate, a plurality of lighting lamps are respectively arranged on both sides above the drain plate through brackets, the bottom of the drain plate is a funnel structure, a downpipe is arranged at the lowest part of the funnel structure, and a test tube brush, a plurality of currently operated measuring cylinders, a camera and a stirring area are respectively arranged on the drain plate between the lighting lamps; a water nozzle is also arranged above the drain plate, wherein the water nozzle is connected to a water source through a water nozzle valve, and the measuring cylinder clamp is arranged on the drain plate;

[0015] The stirring area preparation area includes a weight-bearing cup, a mass sensor, a stirrer, a stirrer switch, a stirring blade, a slurry guide pipe, and a slurry guide pipe valve provided on the stirrer, which are used to make slurry; wherein the weight-bearing cup is arranged above the mass sensor, the stirring blade provided at the bottom of the stirrer extends into the weight-bearing cup to stir the material in the weight-bearing cup, a slurry guide pipe is provided at the bottom of the weight-bearing cup and is connected to the currently operated measuring cylinder, and a slurry guide pipe valve is provided on the slurry guide pipe; a timer is arranged on the main frame; the stirrer is connected to the main switch and the main power supply through the existing link, and a stirrer switch is provided between the main switch and the stirrer;

[0016] a. Connect the funnel structure at the bottom of the drain plate to the drain pipe, connect the water nozzle to the water source, and connect the mixer, lighting and camera to the main power supply. Turn on the main switch of the main power supply and start the lighting;

[0017] b. Weigh the mass of gangue powder and water with different water-cement ratios in a weight cup, then mix them in a weight cup, turn on the mixer switch, use the mixer to stir to make slurry, turn off the mixer switch, take down the measuring cylinder to be used from the measuring cylinder holder, place it on the drain board for standby, connect the slurry guide tube to the current operating measuring cylinder, open the slurry guide tube valve, and let the stirred slurry flow into the current operating measuring cylinder;

[0018] c. When the slurry flows in, use the camera and timer to detect and measure the slurry sedimentation rate until all the configured slurries are tested and the slurry sedimentation rate data of all configurations are obtained;

[0019] d. After the test, turn off the camera and timer, guide the slurry in the current operating cylinder into the water guide groove, clamp the current operating cylinder with a cylinder clamp, open the water nozzle valve and use the water nozzle to clean the current operating cylinder. If there is residual slurry, use a test tube brush to clean it. The slurry flows through the drain plate, through the inclined surface of the water guide groove, and into the sewer pipe. Be careful not to splash the liquid onto the camera and lighting during the cleaning process;

[0020] e. Place the cleaned current operating measuring cylinder upside down on the measuring cylinder holder as the measuring cylinder to be used, and use the cleaned weight-bearing cup as a spare measuring cup to allow the residual water to flow out as quickly as possible. Place other instruments in the drawer, turn off the main switch, unplug the main power supply, disconnect the water source, unplug the water pipe, and move the system by the handle.

[0021] The weight cup is made of polypropylene, has a measuring range of 2L, and is connected to the slurry guide tube at the bottom; the current operating measuring cylinder is made of glass, which can clearly observe the sedimentation rate, has a measuring range of 100mL, and a graduation value of 1mL; the orifice diameter of the slurry guide tube is not less than 20mm, which is convenient for high-concentration slurry to pass through the test area; the camera resolution is 1920×1080, and it is photographed on a computer through corresponding software; the timer is in seconds and displayed in digital mode; the drain plate is made of plexiglass, which can observe the blockage of the water guide groove, has a width of 50mm and a spacing of 20mm, and allows the waste slurry to pass smoothly while keeping the current operating measuring cylinder stable, and is detachable.

[0022] Beneficial effects: The present invention proposes a method for testing the flow properties of gangue powder slurry for overburden isolation grouting, and tests the sedimentation rate, a core flow property of gangue powder slurry. By testing slurries with different particle size ranges and different water-cement ratios of gangue powder, a one-to-one correspondence between the water-cement ratio and the sedimentation rate in each particle size range is obtained, expressed in the form of y=a ln(x)+b. At the same time, the sedimentation rate of the gangue powder slurry can be weighted and calculated according to the proportion of each particle size in other gangue powders. The test method is perfect, and has the advantage of testing the sedimentation rate of a gangue powder slurry and obtaining the sedimentation rate of the slurry under various states of the gangue powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of a testing device used in the method for testing the flow properties of gangue powder slurry for overburden isolation grouting filling of the present invention;

[0024] Figure 2 It is a schematic top view of a testing device used in the method for testing the flow properties of gangue powder slurry for overburden isolation grouting filling of the present invention;

[0025] Figure 3 It is a left schematic diagram of a testing device used in the method for testing flow properties of gangue powder slurry for overburden isolation grouting filling of the present invention.

[0026] In the figure: 1 - measuring cylinder holder; 2 - measuring cylinder to be used; 3 - spare measuring cup; 4 - handle; 5 - main switch; 6 - main power supply; 7 - power cord; 8 - water guide groove; 9 - lighting; 10 - stirring fan blade; 11 - mixer; 12 - weight cup; 13 - slurry guide pipe valve; 14 - camera; 15 - operating measuring cylinder; 16 - water nozzle; 17 - measuring cylinder clamp; 18 - test tube brush; 19 - slurry guide pipe; 20 - drain plate; 21 - sewer pipe; 22 - water source; 23 - quality sensor; 24 - drawer; 25 - system main frame; 26 - water nozzle valve; 27 - mixer switch; 28 - timer. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0028] The method for testing the flow properties of gangue powder slurry for overburden isolation grouting filling of the present invention comprises the following steps:

[0029] First, select the gangue powder to be used for filling slurry, which should be kept in a non-wet state. Then, place the gangue powder in a metal non-magnetic disk and dry it in a drying oven at 105°C for 6-10 hours to completely dry the gangue powder to ensure the accuracy of the water-cement ratio in the test.

[0030] The gangue powder was sieved with 60 mesh, 100 mesh, 200 mesh and 325 mesh square hole sieves respectively to obtain gangue powder with five particle size ranges, namely, particle size ≥ 60 mesh, 60 mesh> particle size ≥ 100 mesh, 100 mesh> particle size ≥ 200 mesh, 200 mesh> particle size ≥ 325 mesh and particle size < 325 mesh; gangue powder with different particle size ranges was used to prepare a variety of filling slurries with different water-cement ratios, the water-cement ratio of the slurry ranged from 0.6 to 2, with an interval of 0.2, and from 2 to 6, with an interval of 1, and the gangue powder with five different particle size ranges was used to prepare the filling slurries with the above 12 water-cement ratios, a total of 60 different filling slurries, wherein each filling slurry with the same particle size and the same water-cement ratio was prepared in 3 groups, and the difference between each group did not exceed 5%, for use in detecting the flow property data of the filling slurries with different particle sizes and different water-cement ratios;

[0031] The main flow property of gangue powder slurry is the sedimentation rate. Therefore, the corresponding sedimentation rates of filling slurries with different particle size ranges and different water-cement ratios are obtained through sedimentation rate tests, and the water-cement ratio and sedimentation rate data are corresponded one by one in each particle size range. The water-cement ratio and sedimentation rate data are fitted through the origin software to obtain a functional relationship such as y=aln(x)+b, where a and b are constants that vary with different experimental parameters. This formula is the relationship between the water-cement ratio and the sedimentation rate of the gangue powder slurry in one of the particle size ranges, thereby obtaining the relationship between the water-cement ratio and the sedimentation rate in each particle size range. Through this functional relationship, the sedimentation rates corresponding to various water-cement ratios of the gangue powder slurry in each particle size range can be calculated.

[0032] When mixing according to the water-cement ratio, since too much or too little water is not conducive to the test, 500g of water is used to prepare the gangue powder slurry using 5 kinds of gangue powder in the particle size range; first, the sedimentation rate test starts with the slurry with a particle size ≥60 mesh and a water-cement ratio of 6, using 500g of water and 83.3g of gangue powder to prepare and test. After the test, start to prepare the water-cement ratio of 5, 500g of water, and 100g of gangue powder. At this time, there is no need to re-prepare the slurry. Just add 100g-83.3g=16.7g of gangue powder of the same particle size to the slurry with a water-cement ratio of 6, that is, to achieve a slurry water-cement ratio of 5, and then use a glass rod to stir again to restore the slurry to the state before precipitation, and use a rubber-tipped dropper to suck out the excess slurry; prepare other slurries with smaller water-cement ratios in the same way for testing, thereby saving the preparation time of the gangue powder slurry.

[0033] By testing the particle size range of the gangue powder with the maximum particle size within 2mm, the sedimentation rate of the gangue powder slurry can be calculated by weighting the proportion of different particle size ranges. The gangue is ground into gangue powder I, and the relationship between the water-cement ratio and the sedimentation rate in different particle size ranges is: particle size ≥60 mesh y1=a1ln(x1)+b1, 60 mesh>particle size ≥100 mesh y2=a2ln(x2)+b2, 100 mesh>particle size ≥200 mesh y3=a3ln(x3)+b3, 200 mesh>particle size ≥325 mesh y4=a4l n(x4)+b4, particle size <325 mesh y5=a5ln(x5)+b5; grind the gangue into gangue powder II, among which particle size ≥60 mesh accounts for 5%, 60 mesh>particle size ≥100 mesh accounts for 10%, 100 mesh>particle size ≥200 mesh accounts for 40%, 200 mesh>particle size ≥325 mesh accounts for 30%, and particle size <325 mesh accounts for 15%. Then the sedimentation rate of the slurry of gangue powder II at a certain water-cement ratio is y=y1×5%+y2×10%+y3×40%+y4×30%+y5×15%.

[0034] Use origin software to fit the relationship between the water-cement ratio and sedimentation rate obtained from the test. The correlation coefficient between the two must be greater than or equal to 95%. If it is less than 95%, the data with a large degree of deviation will be retested.

[0035] A method for testing the flow properties of gangue powder slurry for overburden isolation grouting filling, the testing system used includes a main frame 25, and the main frame 25 is respectively provided with a test platform and a storage area;

[0036] The storage area includes a plurality of neatly arranged measuring cylinder holders 1, each of which is provided with a measuring cylinder 2 to be used and a space for accommodating a plurality of spare measuring cups 3, and a drawer 24 for storage is provided at the edge of the neatly arranged measuring cylinder holders 1, and handles 4 are provided on both sides of the holder;

[0037] The test platform includes a drain plate 20, and a plurality of lighting lamps 9 are respectively arranged on both sides above the drain plate 20 through brackets. The bottom of the drain plate 20 is a funnel structure, and a downpipe 21 is arranged at the lowest point of the funnel structure. A test tube brush 18, a plurality of currently operated measuring cylinders 15, a camera 14 and a stirring area are respectively arranged on the drain plate 20 between the lighting lamps 9; a water nozzle 16 is also arranged above the drain plate 20, wherein the water nozzle 16 is connected to a water source 22 through a water nozzle valve 26, and the measuring cylinder clamp 17 is arranged on the drain plate 20;

[0038] The stirring area preparation area includes a weight-bearing cup 12, a quality sensor 23, a stirrer 11, a stirrer switch 27 arranged on the stirrer 11, a stirring blade 10, a slurry guide pipe 19, and a slurry guide pipe valve 13, which are used to make slurry; wherein the weight-bearing cup 12 is arranged above the quality sensor 23, and the stirring blade 10 arranged at the bottom end of the stirrer 11 extends into the weight-bearing cup 12 to stir the material in the weight-bearing cup 12, a slurry guide pipe 19 is arranged at the bottom end of the weight-bearing cup 12 and is connected to the currently operated measuring cylinder 15, and a slurry guide pipe valve 13 is arranged on the slurry guide pipe 19; a timer 28 is arranged on the main frame 25; the stirrer 11 is connected to the main switch 5 and the main power supply 6 through the existing link, and a stirrer switch 27 is arranged between the main switch 5 and the stirrer 11;

[0039] a. Connect the funnel structure at the bottom of the drain plate 20 to the downpipe 21, connect the water nozzle 16 to the water source 22, and connect the mixer 11, the lighting 9 and the camera 14 to the main power 6, turn on the main switch 5 of the main power 6, and start the lighting 9;

[0040] b. Weigh the mass of gangue powder and water with different water-cement ratios in the weight cup 12, then mix them in the weight cup 12, turn on the mixer switch 27, stir with the mixer 11 to form a slurry, turn off the mixer switch 27, take down the measuring cylinder 2 to be used from the measuring cylinder holder 1, place it on the drain plate 20 for standby use, connect the slurry guide pipe 19 to the current operating measuring cylinder 15, open the slurry guide pipe valve 13, and allow the stirred slurry to flow into the current operating measuring cylinder 15;

[0041] c. When the slurry flows in, the camera 14 and the timer 28 are used to detect the metering slurry sedimentation rate until all the configuration slurry tests are completed to obtain the slurry sedimentation rate data of all configurations;

[0042] d. After the test is finished, turn off the camera 14 and the timer 28, introduce the slurry in the current operating measuring cylinder 15 into the water guide groove 8, clamp the current operating measuring cylinder 15 with the measuring cylinder clamp 17, open the water nozzle valve 26 and use the water nozzle 16 to clean the current operating measuring cylinder 15. If there is residual slurry, it needs to be cleaned with a test tube brush 18. The slurry flows through the drain plate 20, through the inclined surface of the water guide groove 8, and flows into the sewer pipe 21. Be careful not to splash the liquid onto the camera 14 and the lighting lamp 9 during the cleaning process;

[0043] e. Place the cleaned current operating measuring cylinder 15 upside down on the measuring cylinder holder 1 as the measuring cylinder 2 to be used, and the cleaned weight-bearing cup 12 as the spare measuring cup 3, so that the residual water can flow out as soon as possible, place other instruments in the drawer 24, turn off the main switch 5, unplug the main power supply 6, disconnect the water source 22, unplug the water pipe 21, and move the system by the handle 4.

[0044] The weight-bearing cup 12 is made of polypropylene, has a measuring range of 2L, and is connected to the slurry guide tube 19 at the bottom; the currently operating measuring cylinder 15 is made of glass, through which the sedimentation rate can be clearly observed, with a measuring range of 100mL and a graduation value of 1mL; the orifice diameter of the slurry guide tube 19 is not less than 20mm, which is convenient for high-concentration slurry to pass through the test area; the camera 14 has a resolution of 1920×1080, and is photographed on a computer through corresponding software; the timer 28 is in seconds and displayed in digital mode; the drain plate 20 is made of plexiglass, through which the blockage of the water guide trough 8 can be observed, with a width of 50mm and a spacing of 20mm. While keeping the currently operating measuring cylinder 15 stable, the waste slurry can pass smoothly, and it is detachable.

[0045] Embodiment 1

[0046] like Figure 1 As shown, the test system used in the present invention includes a preparation area, a test area, a cleaning area and a storage area; the preparation area is used to prepare slurry and introduce it into the test area; the test area is used to automatically test the sedimentation rate of the overburden isolation grouting filling slurry; the cleaning area is used to clean the measuring tools after the test; the storage area is used to store test instruments and support the operation of the preparation area, the test area and the cleaning area.

[0047] The preparation area of ​​the integrated test system for sedimentation rate of overburden isolation grouting filling slurry includes a measuring cup 12, a mass sensor 23, a mixer 11, a mixer switch 27, a mixing fan 10, a slurry guide pipe 19, and a slurry guide pipe valve 13; the measuring cup 12 is made of polypropylene, has a measuring range of 2L, and is connected to the slurry guide pipe 19 at the bottom; the orifice diameter of the slurry guide pipe 19 is not less than 20mm, which is convenient for high-concentration slurry to pass through to the test area.

[0048] The test area of ​​the integrated test system for sedimentation rate of overburden isolation grouting filling slurry includes a camera 14, a measuring cylinder 15, a lighting lamp 9 and a timer 28; the resolution of the camera 14 is 1920×1080, and the camera 14 is photographed on a computer through corresponding software; the measuring cylinder 15 is made of glass, so the sedimentation rate can be clearly observed, the measuring range is 100mL, and the graduation value is 1mL; the timer 28 is displayed in digital mode in seconds.

[0049] The cleaning area of ​​the integrated test system for sedimentation rate of overburden isolation grouting filling slurry includes a water nozzle 16, a water nozzle valve 26, a measuring cylinder clamp 17, a test tube brush 18, a drain plate 20, a water source 22, a water guide trough 8 and a sewer pipe 21; the water nozzle 16 is made of carbon steel, has excellent bending and supporting characteristics, and can be fixed in a certain form to provide a pressurized water source; the water nozzle 17 is made of carbon steel, has excellent bending and supporting characteristics, and can stably clamp the measuring cylinder 15 for cleaning; the test tube brush 18 is fixed on the drain plate 20 to facilitate its cleaning of the measuring cylinder 15; the drain plate 20 is made of plexiglass, which can be used to observe the blockage of the water guide trough 8, has a width of 50 mm and a spacing of 20 mm, and allows the waste slurry to pass smoothly while keeping the measuring cylinder 15 stable, and is detachable.

[0050] The storage area of ​​the integrated test system for sedimentation rate of overburden isolation grouting filling slurry includes a measuring cylinder holder 1, a drawer 24, a system main frame 25, a handle 4, a main switch 5, a main power supply 6, a power cord 7, a measuring cylinder 2 to be used and a spare measuring cup 3; the measuring cylinder holder 1 is tilted 30° forward to facilitate the placement of the measuring cylinder 2 to be used; the system main frame 25 is made of stainless steel.

Claims

1. A method for testing the flow properties of gangue powder slurry for overburden isolation grouting, characterized in that: The test system used includes a main frame (25), on which a test platform and a storage area are respectively provided; The storage area comprises a plurality of neatly arranged measuring cylinder holders (1), each of which is provided with a measuring cylinder (2) to be used and a space for accommodating a plurality of spare measuring cups (3), and drawers (24) for storing items are provided at the edges of the neatly arranged measuring cylinder holders (1), and handles (4) are provided on both sides of the holders; The test platform comprises a drain plate (20), a plurality of lighting lamps (9) are respectively arranged on both sides above the drain plate (20) through brackets, the bottom of the drain plate (20) is a funnel structure, a downpipe (21) is arranged at the lowest part of the funnel structure, and a test tube brush (18), a plurality of currently operated measuring cylinders (15), a camera (14) and a stirring area are respectively arranged on the drain plate (20) between the lighting lamps (9); a water spray head (16) is also arranged above the drain plate (20), wherein the water spray head (16) is connected to a water source (22) through a water spray head valve (26), and a measuring cylinder clamp (17) is arranged on the drain plate (20); The stirring area preparation area comprises a weight bearing cup (12), a mass sensor (23), a stirrer (11), a stirrer switch (27) arranged on the stirrer (11), a stirring blade (10), a slurry guide pipe (19), and a slurry guide pipe valve (13), which are used to prepare slurry; wherein the weight bearing cup (12) is arranged above the mass sensor (23); the stirring blade (10) arranged at the bottom end of the stirrer (11) extends into the weight bearing cup (12) to stir the material in the weight bearing cup (12); a slurry guide pipe (19) is arranged at the bottom end of the weight bearing cup (12) and is connected to the currently operated measuring cylinder (15); and a slurry guide pipe valve (13) is arranged on the slurry guide pipe (19); a timer (28) is arranged on the main frame (25); the stirrer (11) is connected to the main switch (5) and the main power supply (6) through the link, and a stirrer switch (27) is arranged between the main switch (5) and the stirrer (11); The test method for the flow properties of gangue powder slurry for overburden isolation grouting is as follows a. Connect the funnel structure at the bottom of the drain plate (20) to the drain pipe (21), connect the water nozzle (16) to the water source (22), and connect the mixer (11), the lighting (9) and the camera (14) to the main power supply (6), turn on the main switch (5) of the main power supply (6), and start the lighting (9); b. Weigh the mass of gangue powder and water with different water-cement ratios in a weight cup (12), then mix them in a weight cup (12), turn on the mixer switch (27), stir with the mixer (11) to form a slurry, turn off the mixer switch (27), remove the measuring cylinder (2) to be used from the measuring cylinder holder (1), place it on the drain plate (20) for standby use, connect the slurry guide tube (19) to the currently operating measuring cylinder (15), open the slurry guide tube valve (13), and allow the stirred slurry to flow into the currently operating measuring cylinder (15); c. When the slurry flows in, the camera (14) and the timer (28) are used to detect the sedimentation rate of the metered slurry until all the configured slurry tests are completed to obtain the sedimentation rate data of the slurry of all configurations; d. After the test is completed, turn off the camera (14) and the timer (28), guide the slurry in the current operating cylinder (15) into the water guide groove (8), clamp the current operating cylinder (15) with the cylinder clamp (17), open the water spray head valve (26), use the water spray head (16) to clean the current operating cylinder (15), if there is residual slurry, use the test tube brush (18) to clean it, the slurry flows through the drain plate (20), through the inclined surface of the water guide groove (8), and flows into the drain pipe (21). During the cleaning process, be careful not to splash the liquid onto the camera (14) and the lighting lamp (9); e. Place the cleaned current operating measuring cylinder (15) upside down on the measuring cylinder holder (1) as the measuring cylinder to be used (2), and use the cleaned weight-bearing cup (12) as the spare measuring cup (3) to allow the residual water to flow out as quickly as possible. Place other instruments in the drawer (24), turn off the main switch (5), unplug the main power supply (6), disconnect the water source (22), unplug the drain pipe (21), and move the system by the handle (4).

2. The method for testing the flow properties of gangue powder slurry for grouting filling of overburden isolation according to claim 1 is characterized by: The weight-bearing cup (12) is made of polypropylene, has a measuring range of 2L, and is connected to the slurry guide tube (19) at the bottom. The current operating measuring cylinder (15) is made of glass, which can clearly observe the sedimentation rate, has a measuring range of 100mL, and a graduation value of 1mL. The orifice diameter of the slurry guide tube (19) is not less than 20mm, which is convenient for high-concentration slurry to pass through the test area. The camera (14) has a resolution of 1920×1080, and is photographed on a computer through corresponding software. The timer (28) is in seconds and is displayed in digital mode. The drain plate (20) is made of organic glass, which can observe the blockage of the water guide groove (8). It has a width of 50mm and a spacing of 20mm. It allows the waste slurry to pass smoothly while keeping the current operating measuring cylinder (15) stable. It is detachable.

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