Device and method for testing water dispersion resistance of synchronous grouting liquid for simulating groundwater scouring

Abstract

The invention relates to the technical field of tunnel and underground engineering tests, in particular to a device and a method for testing the water dispersion resistance of synchronous grouting liquid for simulating groundwater scouring. The testing device comprises a testing box, a supporting frame, a spray head installed on one side of the interior of the testing box, a liquid supply module used for supplying liquid to the interior of the spray head, a water receiving barrel, a material storage tank, a filter screen, a mortar injector and a sealing baffle, the material storage tank is detachably installed at the bottom end of the interior of the testing box, and a plurality of filter holes are formed in the bottom end of the material storage tank in a penetrating mode; the filter screen is detachably mounted on the inner side of the storage tank, and a fixing structure for limiting the filter screen is arranged on the storage tank, so that the water dispersion resistance of the synchronous grouting liquid scoured by underground water can be really simulated, samples can be conveniently recycled, the grouting retention rate can be conveniently calculated, the test efficiency can be improved, and meanwhile, the equipment maintenance is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel and underground engineering tests, and in particular to a device and method for testing the anti-water dispersion performance of synchronous grouting liquid simulating groundwater scouring. Background Art

[0002] During shield tunnel construction, the water-dispersion resistance of the synchronous grouting fluid directly impacts the grouting effect and the stability of the tunnel structure. Existing testing methods, which mostly rely on static immersion or simple water flow, fail to accurately simulate the complex dynamic groundwater flow environment found in actual projects, resulting in discrepancies between test results and actual working conditions. Furthermore, existing equipment lacks precise control of the flow velocity, rapid detection of post-flushing water quality parameters, and quantitative assessment of grouting retention, making it difficult to comprehensively evaluate the grouting fluid's water-dispersion resistance.

[0003] In the Chinese Patent Literature Library, application number 201910618514.6 discloses a test device and method for testing the water dispersion resistance of shield synchronous grouting. By controlling the grouting speed and changing the relative speed of the mortar and the water flow, it simulates the flushing and dilution effect of groundwater on the slurry under different flow conditions. However, it is impossible to control the water flow flushing time, cannot truly simulate the complex groundwater dynamic flushing environment, and cannot quickly quantify the grouting retention rate. The detection efficiency is low. Similarly, application number 202311268246.2 discloses a test device and method for the anti-dynamic water dispersion performance of grouting materials. By setting a temperature-controlled water bath, the groundwater temperature can be changed to achieve different flow rates and different temperatures, and the anti-dynamic water dispersion performance of the synchronous grouting slurry can be tested and evaluated. However, it is impossible to quickly weigh and evaluate the mortar residue, and the detection efficiency is low. Application number 202111314498.5 discloses an anti-water erosion device and method for measuring the water-dispersion resistance of grouting materials. By setting a weighing platform for weighing the slurry, the method of taking out the residual slurry and then weighing it is avoided, thereby improving the accuracy of the weighing data. However, the flushing liquid and the like remaining on the weighing platform may still affect the accuracy of the weighing data. At the same time, it is impossible to simulate the actual grouting situation. The direct impact of water flow on the mortar to be tested may also disperse the mortar, affecting the detection accuracy. The weighing platform is set in the erosion water tank, and the subsequent maintenance is also more troublesome. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for testing the anti-water dispersion performance of synchronous grouting fluid simulating groundwater scouring, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a device for testing the water-resistance dispersion performance of a synchronous grouting fluid simulating groundwater scour, comprising:

[0006] test box;

[0007] A support frame, used to support the test box;

[0008] The nozzle is installed on one side of the test chamber;

[0009] A liquid supply module is used to supply liquid to the interior of the nozzle. The liquid supply module includes a water storage tank, a water pipe for pumping liquid from the water storage tank to the interior of the nozzle, a water pump, and an adjustable water valve for accurately controlling the liquid flow rate;

[0010] A water receiving bucket is provided on one side of the test box with a drain outlet, and the water receiving bucket is provided below the side close to the drain outlet to receive the liquid discharged from the drain outlet;

[0011] A material storage trough, which is detachably mounted at the bottom of the test box and has a plurality of filter holes extending through the bottom of the trough;

[0012] A filter screen is detachably mounted on the inner side of the material storage tank, and a fixing structure for limiting the position of the filter screen is provided on the material storage tank;

[0013] A mortar injector, used to add mortar to the inside of the storage tank;

[0014] The sealing baffle is used to seal the bottom of the test box so that a water storage groove is formed at the bottom of the test box and the mortar to be tested is located below the liquid level.

[0015] Furthermore, the mortar injector includes an outer tube with two ends extending therethrough, a piston movably arranged inside the outer tube, and a push rod that pushes the piston to move back and forth inside the outer tube along its length, and is used to extract or inject mortar into the storage tank.

[0016] Furthermore, a top cover is hingedly provided at the top of the test box, a drainage groove is provided at the edge of the storage tank, and a plurality of drainage holes are provided through the bottom end of the drainage groove, the outer peripheral edge height of the drainage groove is lower than the height of the side wall of the storage tank, and the side walls of the storage tank away from the nozzle and the drain outlet are tightly fitted with the inner wall of the test box respectively.

[0017] Furthermore, the fixing structure includes at least two mounting plates abutting against both sides of the top of the material storage trough, a pressure plate fixed at the bottom of the mounting plate, two connecting rods vertically fixed below the two ends of the length of the mounting plate, and limit plates respectively fixed below the connecting rods. A clip corresponding to the limit plate is horizontally provided at the top of the material storage trough, and a C-shaped clamping groove adapted to the connecting rod is provided on the clip. When the connecting rod is inserted into the inner side of the clip, the mounting plate and the limit plate respectively abut against the upper and lower ends of the clip, and the pressure plate presses the filter screen to the bottom end inside the material storage trough.

[0018] Furthermore, at least two support rods are vertically fixed to the top end of the mounting plate, and the top ends of the support rods are connected and fixed via cross rods.

[0019] Furthermore, the width of the drain outlet is smaller than the width of the material storage trough, and the bottom of the drain outlet is flush with the bottom of the test box. The sealing baffle is fixed on the side of the material storage trough close to the drain outlet to block the bottom of the drain outlet.

[0020] Furthermore, the top of the test box is sealed, and a grouting hole is provided through the top of the test box to accommodate the bottom end of the mortar syringe and extend to the interior. A pull-out opening for accommodating a horizontal pull-out storage tank is provided through one side of the test box. The sealing baffle is fixed on one side of the storage tank and is used to seal against the outer wall of the pull-out opening, and sealing gaskets are provided on the abutting surfaces of the sealing baffle and the storage tank and the test box.

[0021] Furthermore, the drain outlet is adapted to the width of the material storage trough, and is used to draw the material storage trough into or insert it into the test box from the drain outlet. A support column and a scraper are provided at the bottom end of the material storage trough, and the scraper and the support column have equal heights. The scraper is located on the side close to the nozzle, and the support rod and the cross bar are in contact with the inner wall of the test box. The sealing baffle is adjustably installed up and down at the drain outlet to limit the material storage trough.

[0022] A method for testing the water dispersion resistance of a synchronous grouting fluid simulating groundwater scouring comprises the following steps:

[0023] S1. Select the appropriate filter screen based on the sand particle size, weigh the filter screen, and then fix the filter screen to the bottom plate of the storage tank;

[0024] S2. Place the storage tank at the bottom of the test chamber, seal the bottom of the drain outlet with a sealing plate, and add water to the chamber.

[0025] S3. Immerse the mortar syringe at a 45±5° inclination angle into the freshly mixed mortar to simulate the actual grouting process, extract the sample at a constant speed, position the syringe vertically above the storage tank (6), and then extrude the sample at a constant speed to complete the grouting. The mortar is located below the liquid level inside the test box. Weigh the mortar syringe before and after grouting to calculate the weight of the mortar added to the storage tank;

[0026] S4. Adjust the water flow rate through the liquid supply module and pump water into the nozzle to generate a uniform water flow with a coverage rate of ≥80% to simulate the groundwater flushing of the mortar in the storage tank. The flow rate range is 1-5m 3 / h, accuracy ±0.05m 3 / h, continuous flushing for 3-10 minutes;

[0027] S5. Collect the flushing water sample from the water collecting bucket, test the suspended matter content, measure the pH value, remove the storage tank, add excess mortar, retain the mortar in the grouting area, and weigh the sum of the weight of the filter screen and the remaining mortar to calculate the grouting retention rate.

[0028] Furthermore, the formula for calculating the grouting retention rate in S5 is: GRR = (m1-m0) / (m2-m0)×100%, where GRR is the grouting retention rate, m0 is the dry weight of the filter, m1 is the total weight after the test, and m2 is the initial grouting amount.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) Improved real simulation capability, through the square shower matrix water outlet structure and adjustable flow rate design, to achieve groundwater scouring flow rate, coverage rate dynamic simulation (1-5m 3 / h continuously adjustable, coverage deviation ≤5%).

[0031] (2) The test efficiency is significantly optimized. The detachable storage tank is combined with the prefabricated filter screen design, which shortens the sample recovery time from the traditional 30 minutes to within 2 minutes. The transparent test box, water storage bucket and water receiving bucket are visually designed to support real-time observation and data recording of the test process.

[0032] (3) Operational reliability is enhanced, leakage in long-term scour tests is reduced, and the mortar injector inclination angle is limited (40-50°) and the extrusion speed is controlled to reduce sample preparation errors caused by manual operation.

[0033] (4) Maintenance costs are reduced. The modular pipeline connection design shortens the replacement time of wearing parts such as water pumps and nozzles by 80%. The filter screen is laid on the bottom plate of the storage tank, and the specifications of the filter screen can be quickly replaced according to the sand particle size. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention;

[0035] Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention;

[0036] Figure 3 This is a schematic cross-sectional view of the mortar injector of the present invention;

[0037] Figure 4 It is a partial explosion schematic diagram of the present invention;

[0038] Figure 5 This is a schematic cross-sectional view of the test box of the present invention;

[0039] Figure 6 This is a schematic diagram of the three-dimensional structure of the material storage tank of the present invention;

[0040] Figure 7 For the present invention Figure 6 A in the middle is an enlarged structural diagram;

[0041] Figure 8 This is a schematic diagram of the top view of the storage tank of the present invention;

[0042] Figure 9 This is a schematic diagram of the three-dimensional structure of Example 2 of the present invention;

[0043] Figure 10 This is a schematic diagram of the three-dimensional structure of the test box in Example 3 of the present invention;

[0044] Figure 11 This is a partial explosion diagram of Example 3 of the present invention;

[0045] Figure 12 This is a schematic diagram of the three-dimensional structure of the storage tank in Example 3 of the present invention.

[0046] In the figure: 1. test box; 101. drain outlet; 102. top cover; 103. grouting hole; 104. pull-out port; 2. support frame; 3. nozzle; 4. liquid supply module; 401. water storage bucket; 402. water pipe; 403. water pump; 404. adjustable speed water valve; 5. water receiving bucket; 6. storage trough; 601. filter hole; 602. drainage groove; 6021. drainage hole; 603. support column; 604. scraper; 7. filter screen; 8. mortar injector; 801. outer tube; 802. piston; 803. push rod; 9. fixing structure; 901. mounting plate; 902. pressure plate; 903. connecting rod; 904. limit plate; 905. buckle; 9051. C-type clamping groove; 10. support rod; 11. cross bar; 12. sealing baffle. DETAILED DESCRIPTION

[0047] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances. In addition, in the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0048] Example 1, please refer to Figure 1-8 The present invention provides an embodiment: a device for testing the water dispersion resistance of a synchronous grouting fluid simulating groundwater scour, comprising: a test box 1, a stainless steel support frame 2 for supporting the test box 1, a nozzle 3 mounted on one side of the interior of the test box 1 via a flange, a liquid supply module 4 for supplying liquid to the interior of the nozzle 3, a water receiving bucket 5, a material storage tank 6, a filter screen 7, and a mortar injector 8. In this embodiment, the test box 1 is a rectangular structure with an open top, with dimensions of 600 mm (length) × 200 mm (width) × 200 mm (height), a wall thickness of 6 mm, and is made of transparent acrylic. A top cover 102 is hingedly provided at the top of the test box 1 for sealing during the test to prevent liquid from splashing from the top. To improve stability, matching buckles (not shown in the figure) can also be provided on the top cover 102 and the test box 1.

[0049] Reference Attachment Figure 1-2 The liquid supply module 4 includes a water tank 401, a water pipe 402 for extracting the liquid inside the water tank 401 to the inside of the nozzle 3, a water pump 403 and an adjustable speed water valve 404 for accurately controlling the liquid flow rate, wherein the flow rate of the water pump 403 can be adjusted in the range of 1-2m 3 / h, and equipped with ±0.05m 3 / h precision flow controller, its water inlet end is connected to the water storage barrel 401 through a water pipe 402, and the output end is connected to the nozzle 3 through another water pipe 402, which is used to pump the water inside the water storage barrel 401 to the inside of the nozzle 3. The outer diameter of the water pipe 402 is 20mm, and the aperture of the water storage barrel 401, the inner diameter of the water inlet and outlet of the water pump 403, the inner diameter of the water inlet and outlet of the adjustable speed water valve 404, and the inner diameter of the water inlet of the nozzle 3 are all 20mm to ensure the matching of the water flow channels. The nozzle 3 is provided with a matrix-distributed water outlet array, and the ratio of the water outlet coverage area to the bottom area of the storage tank 6 is 0.8-1.0. Uniform water flow distribution and precise flow control are achieved through the nozzle 3 and the adjustable speed water valve 404, simulating the scouring and dilution effect of groundwater on the slurry under different flow rate conditions. At the same time, the maintenance cost is reduced, and the modular pipeline connection design shortens the replacement time of wearing parts such as the water pump 403 and the nozzle 3 by 80%.

[0050] A drain outlet 101 is provided on one side of the test box 1. The width of the drain outlet 101 is smaller than the width of the test box 1, which can limit the material storage trough 6. The bottom end of the drain outlet 101 is flush with the bottom end of the inner part of the test box 1. The water receiving bucket 5 is arranged below the side close to the drain outlet 101 to receive the liquid discharged from the drain outlet 101. The support frame 2 is specifically arranged at the bottom end of the test box 1 to provide support, so that the test box 1 remains horizontal (horizontal deviation ≤ 1°), so that the height of the test box 1 is higher than the water receiving bucket 5, forming gravity drainage.

[0051] The storage tank 6 is detachably mounted at the bottom of the test box 1, and a plurality of filter holes 601 are provided through the bottom of the storage tank 6. The filter screen 7 is detachably mounted on the inner side of the storage tank 6, so that the mortar can be taken out and the remaining weight can be weighed after the water flushing test is completed, and the grouting retention rate can be calculated, so that the sample recovery time is shortened from the traditional 30 minutes to within 2 minutes. The aperture of the filter screen 7 is specifically 20 to 30 meshes (0.6 to 1.18 mm), which is suitable for the sand particle size of the mortar to be tested.

[0052] In this embodiment, the width of the drain outlet 101 is smaller than the width of the material storage trough 6, and the bottom end of the drain outlet 101 is flush with the bottom end of the test box 1. The sealing baffle 12 is fixed to the side of the material storage trough 6 close to the drain outlet 101 to block the bottom end of the drain outlet 101. The sealing baffle 12 can be specifically connected to the test box 1 by sliding up and down through a slide rail slot. During assembly, the material storage trough 6 is inserted into the test box 1 from top to bottom as a whole. The two sides of the width of the drain outlet 101 can play a limiting role to prevent the material storage trough 6 from sliding along the length direction of the test box 1 under the impact of water flow. At the same time, the sealing baffle 12 presses against the two sides of the drain outlet 101 to form a water storage groove at the bottom of the test box 1, and the height of the water storage is higher than the top of the material storage trough 6. During testing, the mortar added to the material storage trough 6 can be submerged below the liquid surface, and then the mortar is underwater impacted by the nozzle 3 to test its water dispersion resistance, so as to prevent the water from directly impacting the mortar and dispersing it.

[0053] Reference Attachment Figure 6-7 , a fixing structure 9 is provided on the storage tank 6 for limiting the filter screen 7 to prevent the filter screen 7 from being displaced and causing leakage of mortar. In this embodiment, the storage tank 6 is a rectangular parallelepiped structure with an open top, which can move up and down inside the test box 1 without interfering with the movement of the nozzle 3. A rectangular drainage groove 602 is provided at the edge of the storage tank 6. The outer peripheral edge height of the drainage groove 602 is lower than the height of the side wall of the storage tank 6, and a plurality of drainage holes 6021 are penetrated at the bottom of the drainage groove 602. The two sides of the storage tank 6 away from the nozzle 3 and the drain outlet 101 are tightly fitted with the inner wall of the test box 1 respectively. After the water flushing test is completed, when the storage tank 6 is drawn out upward to recover the sample, the liquid on the inner wall of the test box 1 can be automatically scraped off, reducing the workload of subsequent cleaning. The liquid directly enters the drainage groove 602 and is finally discharged through the drainage holes 6021. In order to improve the cleaning effect, an elastic rubber ring can be provided on the outer peripheral wall of the storage tank 6.

[0054] The fixing structure 9 includes two mounting plates 901 abutting against the two sides of the length of the top of the storage tank 6, a pressing plate 902 fixed to the bottom of the mounting plate 901, two connecting rods 903 fixed vertically below the two ends of the length of the mounting plate 901, and limit plates 904 fixed respectively below the connecting rods 903. The mounting plate 901 abuts against the top of the edge of the storage tank 6, and the pressing plate 902 is inserted into the interior of the storage tank 6 to press down the two sides of the filter screen 7. The connecting rod 903 and the limit plates 904 extend above the drainage groove 602 respectively. A buckle 905 corresponding to the limit plate 904 is horizontally provided at the top of the storage tank 6, and a C-shaped clamping groove 9051 adapted to the connecting rod 903 is provided on the buckle 905. The C-shaped clamping groove 905 1 can undergo elastic deformation, which facilitates the horizontal insertion of the connecting rod 903 into the inner side to achieve automatic clamping and fixing. When the connecting rod 903 is inserted into the inner side of the buckle 905, the mounting plate 901 and the limiting plate 904 respectively abut against the upper and lower ends of the buckle 905, and the pressing plate 902 presses the filter screen 7 to the bottom end of the storage tank 6. During assembly, first place the filter screen 7 of appropriate specifications horizontally at the bottom end of the storage tank 6 according to the sand particle size, and then insert the pressing plate 902 into the inner side of the storage tank 6. At this time, the mounting plate 901 overlaps the width of the storage tank 6, and then pushes the mounting plate 901 horizontally to make the connecting rod 903 snap into the inner side of the C-shaped clamping groove 9051. At this time, the mounting plate 901 and the limiting plate 904 respectively abut against the upper and lower ends of the buckle 905 to achieve limitation. In order to facilitate the removal of the storage tank 6 to recover samples, two support rods 10 are vertically fixed to the top of the mounting plate 901, and the top of the support rods 10 is connected and fixed by a cross bar 11. The height of the cross bar 11 is not higher than the height of the storage tank 6. After the test is completed, the cross bar 11 can be held to lift the entire storage tank 6, so that the excess water inside the storage tank 6 is discharged downward through the filter hole 601, and then discharged and collected through the drain port 101. Finally, the drained storage tank 6 is taken out to recover the remaining mortar and calculate the grouting retention rate.

[0055] The mortar injector 8 is used to add mortar to the inside of the storage tank 6, which can simulate the actual grouting process and improve the test accuracy. Figure 3 The mortar injector 8 includes an outer tube 801 with two ends through, a piston 802 movably arranged inside the outer tube 801, and a push rod 803 that pushes the piston 802 to move back and forth along the length direction inside the outer tube 801, which is used to extract or inject mortar into the storage tank 6. When the mortar is added to the storage tank 6, it is generally a circular area. Specifically, the outer tube 801 includes a barrel made of transparent PVC and a conical injection head integrally arranged at the bottom of the barrel. The barrel is 380 mm long, 60 mm in outer diameter, 2 mm in wall thickness, 120 mm in injection head height, and an outlet outer diameter of 1. 21mm, wall thickness 2mm, 45° tilt design facilitates grouting, and simple structure, reduces equipment investment, and facilitates later maintenance. The mortar is extracted / squeezed into the mortar injector 8 to simulate the actual grouting process. If extracted / squeezed into the mortar at a speed of 1cm / s, the flow rate is 28.27ml / s; at a speed of 2cm / s, the flow rate is 56.54ml / s. The mortar is subjected to different resistance during extraction and extrusion, and the resistance during extrusion may be greater. The speed during extraction is 56±10mL / s, and the speed during extrusion is 28±10mL / s.

[0056] In this embodiment, the test box 1 , the water storage bucket 401 and the water receiving bucket 5 are all made of transparent materials, which facilitates real-time observation and data recording during the test process.

[0057] Based on the same inventive concept, this embodiment also proposes a testing method for the water dispersion resistance of the synchronous grouting fluid using the above-mentioned simulated groundwater scouring testing device, comprising the following steps:

[0058] S1. Select the appropriate filter screen 7 according to the sand particle size, weigh the filter screen 7, and then fix the filter screen 7 to the bottom plate of the storage trough 6;

[0059] S2. The storage tank 6 is placed inside the test box 1 at the bottom, the sealing baffle 12 blocks the bottom end of the drain outlet 101, and water is added to the interior of the test box 1;

[0060] S3. Immerse the mortar syringe 8 at a 45±5° angle into the freshly mixed mortar and draw the sample at a constant rate of 56±10 mL / s. Position the syringe vertically above the reservoir 6 and complete the grouting at a rate of 28±10 mL / s. This simulates the actual grouting process. The mortar is below the liquid level in the test chamber 1. Weigh the mortar syringe 8 before and after grouting to calculate the weight of the mortar added to the reservoir 6.

[0061] S4. Adjust the water flow rate through the liquid supply module 4, pump water into the nozzle 3 to generate a uniform water flow with a coverage rate of ≥80% to simulate the groundwater flushing of the mortar in the storage tank 6, where the flow range is 1-5m3 / h, accuracy ±0.05m 3 / h, and continuously flush for 3-10 minutes. Before formal measurement, the flow rate needs to be calibrated. The opening of the adjustable water valve 404 is set according to the formula Q = ν·A (ν is the target flow rate, A is the water cross-sectional area). The actual flow rate is calibrated to within ±2% of the target value using an ultrasonic flow meter to reduce measurement errors.

[0062] S5. Collect the flushing water sample in the water receiving bucket 5, test the suspended matter content with reference to GB / T37990-2019 "Technical Requirements for Underwater Non-dispersible Concrete Flocculants", use a calibrated pH meter (accuracy ±0.001) to measure the pH value, take out the storage tank 6, rinse the excess mortar on the filter screen 7 with deionized water, retain the mortar in the grouting area, and weigh the sum of the weight of the filter screen 7 and the remaining mortar to calculate the grouting retention rate. Specifically, the formula for calculating the grouting retention rate is: GRR = (m1-m0) / (m2-m0)×100%, where GRR is the grouting retention rate, m0 is the dry weight of the filter screen 7, m1 is the total weight after the test, and m2 is the initial grouting amount.

[0063] Example 2, see attached Figure 9 , the difference between this embodiment and embodiment 1 is that the top of the test box 1 is sealed, and the top of the test box 1 is penetrated by a grouting hole 103 for accommodating the mortar syringe 8 and extending to the inside, the bottom end height of the drain outlet 101 is not lower than the height of the storage tank 6, and one side of the test box 1 is penetrated by a drawing port 104 for accommodating the horizontally drawn storage tank 6, and the sealing baffle 12 is fixed to the side of the storage tank 6 near the drawing port 104, that is, in this embodiment, there is no need to set the support rod 10 and the cross bar 11, and the sample can be recovered by horizontally pulling the storage tank 6. In order to improve the sealing performance, the sealing baffle 12 and the abutting surface of the storage tank 6 and the test box 1 are all provided with a silicone sealing gasket. After the water flow flushing test is completed, the storage tank 6 can be horizontally withdrawn to weigh the weight of the residue on the filter screen 7 to calculate the grouting retention rate, refer to the attached Figure 9 The side wall of the material storage trough 6 is provided with an opening for accommodating the nozzle head 3 to move back and forth relative to its width direction, so as to avoid movement interference between the material storage trough 6 and the nozzle head 3 when pulling out.

[0064] Example 3, see attached Figure 10-12, the difference between this embodiment and embodiment 1 is that the drain outlet 101 is adapted to the width of the material storage tank 6, and is used to draw the material storage tank 6 into or insert it into the interior of the test box 1 from the drain outlet 101. The drain outlet 101 is adapted to the opening of the water receiving bucket 5, and the sealing baffle 12 is adjustable up and down at the drain outlet 101 through the slide rail slot. When the sealing baffle 12 is pushed to the lowest end, the bottom end of the sealing baffle 12 abuts against the bottom end of the inner side of the drain outlet 101, which can achieve sealing and blockage, so that a water storage groove is formed at the bottom end of the test box 1. At this time, the top end of the sealing baffle 12 is higher than the top end of the material storage tank 6. During the test, the mortar is located below the liquid level, so that the water flow can impact the mortar below the liquid level. At the same time, the sealing baffle 12 can limit the material storage tank 6. , to prevent one end from sliding out of the test box 1, the sealing baffle 12 is pulled out as a whole, and the storage tank 6 can also be pulled out horizontally to recover the sample. The bottom of the storage tank 6 is provided with a support column 603 and a scraper 604, and the scraper 604 and the support column 603 are equal in height to ensure that the storage tank 6 is in a horizontal state as a whole. The scraper 604 is located on the side close to the nozzle 3. When the storage tank 6 is pulled out, the scraper 604 can scrape off the mortar material and the like deposited at the bottom of the test box 1. After the inspection is completed, the sealing baffle 12 is slid upward, and the excess water inside can be discharged downward through the filter hole 601, and then enter the water receiving bucket 5 through the drain port 101 for recovery. Finally, the drained storage tank 6 can be extracted to recover the sample and calculate the grouting retention rate. In this embodiment, the support rod 10 and the cross bar 11 are in contact with the inner wall of the test box 1. After the water flushing test is completed, when the storage tank 6 is pulled out horizontally from the drain outlet 101, the support rods 10 on both sides are close to the side walls on both sides of the internal width of the test box 1, and the cross bar 11 is close to the internal top. The support rod 10 and the cross bar 11 can scrape off the sewage and the like splashed on the inner wall during the test, and the scraper 604 scrapes off the liquid or solid-liquid mixture at the bottom, reducing the workload of subsequent cleaning, and at the same time avoiding residual materials and the like from affecting the accuracy of subsequent tests. In order to improve the cleaning effect, rubber pads can be set on the bottom end of the scraper 604 and the outer walls of the support rod 10 and the cross bar 11.

[0065] In this embodiment, the top of the test box 1 is sealed, and a grouting hole 103 is provided through the top of the test box 1 to accommodate the mortar syringe 8 and extend to the interior. Furthermore, an openable and closable top cover 102 can be provided on the top of the test box 1 as needed. In this case, there is no need to provide the grouting hole 103. By opening the top cover 102, the mortar to be tested can be added to the inside of the storage tank 6.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A device for testing the water dispersion resistance of synchronous grouting fluid simulating groundwater scour, characterized in that: include: Test box (1); A support frame (2) for supporting the test box (1); A nozzle (3) is installed on one side of the interior of the test box (1); A liquid supply module (4) is used to supply liquid to the interior of the nozzle (3), the liquid supply module (4) comprising a water storage barrel (401), a water pipe (402) for pumping liquid from the water storage barrel (401) to the interior of the nozzle (3), a water pump (403), and an adjustable water valve (404) for accurately controlling the flow rate of the liquid; A water receiving bucket (5), wherein a drain outlet (101) is provided through one side of the test box (1), and the water receiving bucket (5) is provided below the side close to the drain outlet (101) and is used to receive liquid discharged from the drain outlet (101); A material storage trough (6), wherein the material storage trough (6) is detachably mounted at the bottom end of the test box (1), and a plurality of filter holes (601) are provided through the bottom end of the material storage trough (6); A filter screen (7), wherein the filter screen (7) is detachably mounted on the inner side of the material storage tank (6), and a fixing structure (9) for limiting the position of the filter screen (7) is provided on the material storage tank (6); A mortar injector (8) for adding mortar into the storage tank (6); The sealing baffle (12) is used to seal the bottom of the test box (1), so that a water storage groove is formed at the bottom of the test box (1), and the mortar to be tested is located below the liquid level.

2. The device for testing the anti-water dispersion performance of synchronous grouting fluid simulating groundwater scour according to claim 1, characterized in that: The mortar injector (8) comprises an outer tube (801) with two ends extending therethrough, a piston (802) movably arranged inside the outer tube (801), and a push rod (803) for pushing the piston (802) to move back and forth inside the outer tube (801) along its length, and is used for extracting or injecting mortar into the storage tank (6).

3. The device for testing the anti-water dispersion performance of synchronous grouting fluid simulating groundwater scour according to claim 1, characterized in that: The top of the test box (1) is hingedly provided with a top cover (102), the edge of the material storage tank (6) is provided with a drainage groove (602), and the bottom of the drainage groove (602) is penetrated by a plurality of drainage holes (6021), the outer peripheral edge height of the drainage groove (602) is lower than the height of the side wall of the material storage tank (6), and the side walls of the material storage tank (6) away from the nozzle (3) and the drain outlet (101) are respectively tightly fitted with the inner wall of the test box (1).

4. The device for testing the anti-water dispersion performance of synchronous grouting fluid simulating groundwater scour according to claim 1, characterized in that: The fixing structure (9) comprises at least two mounting plates (901) abutting against both sides of the top end of the material storage trough (6), a pressing plate (902) fixed at the bottom end of the mounting plate (901), two connecting rods (903) fixed vertically below the two ends of the length of the mounting plate (901), and limiting plates (904) respectively fixed below the connecting rods (903). The top end of the material storage trough (6) is horizontally provided with a buckle (905) corresponding to the limiting plates (904), and the buckle (905) is provided with a C-shaped clamping groove (9051) adapted to the connecting rod (903). When the connecting rod (903) is inserted into the inner side of the buckle (905), the mounting plate (901) and the limiting plate (904) are respectively abutted against the upper and lower ends of the buckle (905), and the pressing plate (902) presses the filter screen (7) to the bottom end inside the material storage trough (6).

5. The device for testing the anti-water dispersion performance of synchronous grouting fluid simulating groundwater scour according to claim 4, characterized in that: At least two support rods (10) are vertically fixed to the top end of the mounting plate (901), and the top ends of the support rods (10) are connected and fixed via a cross bar (11).

6. The device for testing the anti-water dispersion performance of synchronous grouting fluid simulating groundwater scour according to claim 5, characterized in that: The width of the drain outlet (101) is smaller than the width of the material storage trough (6), and the bottom end of the drain outlet (101) is flush with the bottom end of the test box (1). The sealing baffle (12) is fixed on the side of the material storage trough (6) close to the drain outlet (101) to block the bottom end of the drain outlet (101).

7. The device for testing the anti-water dispersion performance of synchronous grouting fluid simulating groundwater scour according to claim 1, characterized in that: The top of the test box (1) is sealed, and a grouting hole (103) is provided through the top of the test box (1) to accommodate the bottom end of the mortar injector (8) and extend to the inside. A drawing opening (104) for accommodating a horizontal drawable material storage tank (6) is provided through one side of the test box (1). The sealing baffle (12) is fixed to one side of the material storage tank (6) and is used to abut against the outer side wall of the drawing opening (104) for sealing. Sealing gaskets are provided on the contact surfaces of the sealing baffle (12), the material storage tank (6) and the test box (1).

8. The device for testing the anti-water dispersion performance of synchronous grouting fluid simulating groundwater scour according to claim 5, characterized in that: The drain outlet (101) is adapted to the width of the material storage trough (6) and is used to draw the material storage trough (6) from the drain outlet (101) or insert it into the interior of the test box (1). A support column (603) and a scraper (604) are provided at the bottom end of the material storage trough (6), and the scraper (604) and the support column (603) are of equal height. The scraper (604) is located on a side close to the nozzle (3). The support rod (10) and the cross rod (11) are in contact with the inner wall of the test box (1). The sealing baffle (12) is adjustable up and down at the drain outlet (101) and is used to limit the position of the material storage trough (6).

9. A method for testing the anti-water dispersion performance of synchronous grouting fluid using the device for testing the anti-water dispersion performance of synchronous grouting fluid simulating groundwater scour according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Select the appropriate filter screen (7) according to the sand particle size, weigh the filter screen (7), and then fix the filter screen (7) to the bottom plate of the storage trough (6); S2. Place the storage tank (6) into the bottom of the test box (1), seal the baffle (12) to block the bottom of the drain outlet (101), and add water to the inside of the test box (1); S3. Immerse the mortar syringe (8) at an angle of 45±5° into the freshly mixed mortar to simulate the actual grouting process, extract the sample at a constant speed, position the syringe vertically above the storage tank (6), and then extrude the sample at a constant speed to complete the grouting. The mortar is located below the liquid level inside the test box (1). Weigh the mortar syringe (8) before and after grouting, and calculate the weight of the mortar added to the storage tank (6); S4. The water flow rate is adjusted by the liquid supply module (4), and the water is pumped into the nozzle (3) to generate a uniform water flow with a coverage rate of ≥80% to simulate the groundwater flushing of the mortar in the storage tank (6), wherein the flow range is 1-5m 3 / h, accuracy ±0.05m 3 / h, continuous flushing for 3-10 minutes; S5. Collect the flushing water sample in the water receiving bucket (5), test the suspended matter content, measure the pH value, remove the storage tank (6), rinse the excess mortar on the filter (7) with deionized water, retain the mortar in the grouting area, and weigh the sum of the weight of the filter (7) and the remaining mortar to calculate the grouting retention rate.

10. The testing method according to claim 9, characterized in that: The formula for calculating the grouting retention rate in S5 is: GRR = (m1-m0) / (m2-m0)×100%, where GRR is the grouting retention rate, m0 is the dry weight of the filter (7), m1 is the total weight after the test, and m2 is the initial grouting amount.

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