Two-dimensional permeation tank blind pass filter material filling drainage test device and method

Abstract

The invention discloses a two-dimensional permeation tank blind pass filter material filling drainage test device and method. The device comprises a permeation mechanism, a water supply mechanism connected with the permeation mechanism and providing a water source for the permeation mechanism, and an overflow mechanism connected with the permeation mechanism; the permeation mechanism comprises a supporting frame, a permeation box arranged on the supporting frame, a water permeable partition plate arranged on the upper portion of the interior of the permeation box, a blind pass arranged in the permeation box, and a water injection opening, a blind pass water outlet, a salinity detection hole, an overflow opening and a pressure measuring hole which are formed in the permeation box, and the blind pass is filled with a sand gravel filter material; the pressure measuring hole is connected with the pressure measuring assembly through a pipeline. According to the device, an indoor mechanical clogging backwashing experiment is carried out by adopting a hydraulic infiltration box, multi-dimensional control and monitoring of the infiltration process are realized, and the water flow change, the clogging condition and the stability of a blind pass structure in the drainage process are observed and analyzed by simulating actual soil conditions and combining filter material filling and blind pass systems; therefore, the recovery condition of the clogging condition is judged conveniently and reliably.

Description

Technical Field

[0001] The invention relates to the technical field of blind channel drainage, and in particular to a two-dimensional infiltration trough blind channel filter material filling drainage test device and method. Background Art

[0002] Underground drainage is a simple, easy and low-cost drainage technology measure, but due to the influence of freezing and thawing, the underground channel is prone to certain damage. In order to solve the problems of reduced drainage efficiency, easy clogging and easy collapse of the underground channel system, according to the application needs of underground drainage engineering, with the goal of improving the drainage effect of the underground pipe system and the stability of the underground channel, a self-made hydraulic penetration box was used to carry out indoor mechanical clogging backwashing test, and the drainage, stability and soil retention of the underground channel filled with sand and gravel filter material under simulating actual soil conditions were evaluated.

[0003] The commonly used indoor infiltration blockage experimental device has certain limitations in simulating the infiltration blockage of the underground channel filled with gravel filter media, because it cannot reflect the influence of slope and underground channel spacing on the drainage effect and stability after the underground channel is filled with gravel filter media, and the monitoring time of the blockage of gravel filter media in the underground channel is short, which cannot accurately reflect the blockage of the gravel filter media filter layer. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a two-dimensional infiltration trough dark channel filter material filling drainage test device and method.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a two-dimensional infiltration tank dark channel filter material filling and drainage test device, comprising an infiltration mechanism, a water supply mechanism connected to the infiltration mechanism and providing a water source for the infiltration mechanism, and an overflow mechanism connected to the infiltration mechanism;

[0006] The infiltration mechanism includes a support frame, an infiltration box arranged on the support frame, a permeable baffle arranged above the inside of the infiltration box, a blind channel arranged inside the infiltration box, and a water injection port, a blind channel outlet, a salt detection hole, an overflow port and a pressure measuring hole respectively arranged on the infiltration box, the blind channel is filled with sand and gravel filter material, the pressure measuring hole is connected to the pressure measuring assembly through a pipeline, the blind channel outlet is connected to the blind channel, the water injection port is respectively located at the upper and lower parts of the infiltration box, and the overflow port is located at the upper end of the infiltration box.

[0007] Furthermore, the pressure measuring assembly includes a mobile base, a bracket arranged on the mobile base, a pressure measuring plate arranged on the bracket, and a plurality of pressure measuring tubes arranged on the pressure measuring plate and having upper and lower openings, and the pressure measuring tubes are connected to the pressure measuring holes through pipelines.

[0008] Furthermore, a plurality of card slots are provided in the infiltration box, cards are inserted into the card slots, gaps are formed between adjacent cards, and the gaps are configured as blind passages.

[0009] Furthermore, the water supply mechanism includes a support base, a column arranged on the support base, and a water supply tank connected to the column through a locking clamp, and the water supply tank is connected to the water injection port through a pipeline.

[0010] Furthermore, the overflow mechanism includes a water collecting bucket and an overflow pipe connected between the water collecting bucket and the overflow port.

[0011] Furthermore, the support frame includes a frame body, a support table surface arranged at the upper end of the frame body, and a pulley arranged at the bottom end of the frame body and having a brake, and the penetration box is arranged on the support table surface.

[0012] Furthermore, limiting members for preventing the infiltration box from shifting are arranged at the four corners of the supporting table, and the limiting members are respectively attached to adjacent side surfaces of the infiltration box.

[0013] The present invention also provides a two-dimensional infiltration trough dark channel filter material filling drainage test method, which uses a test device to conduct the test, including the following steps:

[0014] S1: Determine the gradation of filter material filled into the dark channel;

[0015] S2: Fill the filter material determined in S1 into the permeation box in a layered filling manner, and perform exhaust and water injection operations from the water injection port at the bottom of the permeation box through the water supply mechanism;

[0016] S3: The permeate box is left to stand until the saturation requirement is reached, and then water is slowly injected through the water injection port on the top of the permeate box, and the height of the injected water level is controlled through the overflow port;

[0017] S4: After the water injection is completed, the bubbles in the pressure measuring tube are discharged to make the water columns in all the pressure measuring tubes at the same height;

[0018] S5: Start the test and conduct analysis on the attenuation of the dark channel flow, the permeability of the gravel filter material, the soil retention performance of the gravel filter material, and the anti-clogging performance of the gravel filter material.

[0019] Furthermore, when the filter material gradation is determined in step S1, the following steps are included:

[0020] S1.1: Determine the basic properties of soil;

[0021] S1.2: Use the Sherard 1989 method and the Taishaji criteria to determine the filter media gradation;

[0022] S1.3: Screening filter materials: Screening filter materials in each particle size range according to the required particle size;

[0023] S1.4: Mix the filter media and mix the screened filter media evenly.

[0024] Further, step S2 includes the following steps:

[0025] S2.1: Lay quartz sand with a thickness of 2cm-4cm and a diameter of 2mm-4mm;

[0026] S2.2: Place a permeable baffle and lay filter paper on the permeable baffle;

[0027] S2.3: Calculate the dry soil weight required for each layer to fill the soil column according to the required bulk density;

[0028] S2.4: Then, the soil is loaded layer by layer and compacted with a tamping tool to ensure uniform density of the soil and good contact between adjacent layers;

[0029] S2.5: Use the water supply method of injecting water from bottom to top, slowly inject water into the infiltration box through the water injection port at the bottom of the infiltration box, gradually permeate the soil upwards and discharge gas;

[0030] S2.6: After the soil in the infiltration box is completely soaked, the next layer is filled in, and saturated exhaust is performed after each filling. After the last layer of soil is filled, a layer of filter paper and a permeable partition are covered on it, and then saturated exhaust is performed.

[0031] The present invention has the following beneficial effects: a two-dimensional infiltration trough and blind channel filter material filling and drainage test device provided by the present invention adopts a hydraulic infiltration box to carry out indoor mechanical clogging backwashing experiments, thereby realizing multi-dimensional control and monitoring of the infiltration process, and simulating actual soil conditions, combining filter material filling and blind channel systems, observing and analyzing water flow changes, clogging conditions and the stability of the blind channel structure during drainage, thereby judging the recovery of the clogging conditions, and further exploring effective prevention and control measures to alleviate the mechanical clogging of soda saline-alkali soil blind channels filled with gravel filter materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the present invention;

[0033] Figure 2 This is a front view of the penetration box in the present invention;

[0034] Figure 3 It is a right side view of the penetration box in the present invention;

[0035] Figure 4 It is a schematic diagram of the infiltration method of the present invention;

[0036] Figure 5 It is the soil and filter material gradation curve diagram in the present invention;

[0037] Figures 1 to 5The reference numerals shown in the figure represent respectively: 1-infiltration mechanism, 2-water supply mechanism, 3-overflow mechanism, 10-support frame, 11-infiltration box, 12-permeable baffle, 13-blind channel, 14-water inlet, 15-blind channel outlet, 16-salt detection hole, 17-overflow, 18-pressure measuring hole, 19-pressure measuring assembly, 190-movable base, 191-bracket, 192-pressure measuring plate, 193-pressure measuring tube, 20-support base, 21-column, 22-water supply box, 30-water collecting bucket, 31-overflow pipe, 100-frame, 101-support table, 102-limiting member. DETAILED DESCRIPTION

[0038] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0039] like Figure 1 As shown, a two-dimensional infiltration trough and dark channel 13 filter material filling drainage test device includes an infiltration mechanism 1, a water supply mechanism 2 connected to the infiltration mechanism 1 and providing water source for the infiltration mechanism 1, and an overflow mechanism 3 connected to the infiltration mechanism 1. The infiltration mechanism 1 is the core part of the test device, which is mainly used to simulate and observe the two-dimensional seepage phenomenon, especially the drainage effect after the dark channel 13 filter material is filled. It provides a controllable seepage environment so that researchers can accurately measure and analyze the seepage characteristics. When in use, an appropriate amount of soil and dark channel 13 filter material are filled in the infiltration trough to simulate the actual geological conditions. Water source is injected into the infiltration trough through the water supply mechanism 2 to form a stable seepage field, and the flow of water through the filter material and soil during the seepage process is observed and recorded, including parameters such as flow rate and flow rate. The water supply mechanism 2 provides a stable water source for the infiltration mechanism 1 to ensure the continuous seepage process. It can also control the flow rate and pressure of the water source to meet different test requirements. According to the test requirements, the flow rate and pressure of the water source are adjusted to form a stable seepage field, monitor the supply of water source, and ensure the smooth progress of the test. The overflow mechanism 3 is used to collect and discharge excess water that exceeds the capacity of the infiltration tank to prevent water from overflowing and affecting the test results. It can also be used to monitor and measure the drainage volume to evaluate the drainage efficiency of the filter material in the dark channel 13. The overflow mechanism 3 ensures the moisture balance during the test and prevents the influence of water overflow on the test results. At the same time, by monitoring and measuring the drainage volume, the drainage efficiency of the filter material in the dark channel 13 can be accurately evaluated, providing data support for optimizing the filter material design and improving the drainage performance.

[0040] like Figures 2 to 3As shown, the infiltration mechanism 1 includes a support frame 10, an infiltration box 11 arranged on the support frame 10, a water-permeable baffle 12 arranged above the inside of the infiltration box 11, a blind channel 13 arranged inside the infiltration box 11, and a water injection port 14, a blind channel outlet 15, a salt detection hole 16, an overflow port 17 and a pressure measuring hole 18 respectively arranged on the infiltration box 11. The blind channel 13 is filled with sand and gravel filter material, the pressure measuring hole 18 is connected to the pressure measuring assembly 19 through a pipeline, the blind channel outlet 15 is connected to the blind channel 13, the water injection port 14 is respectively located at the upper and lower parts of the infiltration box 11, and the overflow port 17 is located at the upper end of the infiltration box 11. The support frame 10 is the supporting structure of the entire infiltration mechanism 1, which is used to fix and support the infiltration box 11, ensure its stability and safety during the test, and avoid test errors caused by shaking or tilting. The infiltration box 11 is the main part of the test device, which is used to accommodate the permeable baffle 12, the dark channel 13, the gravel filter material and other components, and form a closed seepage environment. Before the test begins, the permeable baffle 12, the dark channel 13, the gravel filter material and other components are installed in the infiltration box 11 according to the design requirements. Then, water is injected into the infiltration box 11 through the water injection port 14 to form a seepage field. The permeable baffle 12 is set above the inside of the infiltration box 11 to separate the water source and the gravel filter material to prevent the water source from directly scouring the filter material, while allowing water to penetrate into the filter material below through the baffle, and at the same time prevent saturated exhaust and soil scouring and loss during the test infiltration process. When the water source is injected into the infiltration box 11 through the water injection port 14, the water first contacts the permeable baffle 12. Under the action of the baffle, the water is evenly distributed to the gravel filter material below, forming a stable seepage field. The dark channel 13 is set inside the infiltration box 11 to simulate the groundwater channel. The sand and gravel filter material is filled in the dark channel 13 to play the role of filtering and drainage, and the water flow changes, siltation and stability of the dark channel 13 structure during the drainage process can be intuitively observed and analyzed. The water injection port 14 above the infiltration box 11 carries out the drainage test of the dark channel 13 and injects water to infiltrate and wash the salt. The water injection port 14 below injects water during the filling process to perform saturated exhaust. The overflow port 17 cooperates with the upper water injection port 14 to control the test infiltration water. The dark channel outlet 15 discharges and collects the water discharged from the dark channel 13, and measures its flow rate and turbidity. The salt detection hole 16 measures the change of soil salinity and analyzes the desalination rules and effects. The pressure measuring hole 18 measures the water head at different positions, calculates the permeability coefficient, and analyzes the changes in the permeability coefficient at different times and different positions.

[0041] The pressure measuring assembly 19 includes a mobile base 190, a bracket 191 disposed on the mobile base 190, a pressure measuring plate 192 disposed on the bracket 191, and a plurality of pressure measuring tubes 193 disposed on the pressure measuring plate 192 and having an opening structure at the top and bottom. The pressure measuring tubes 193 are connected to the pressure measuring hole 18 through a pipeline. The mobile base 190 is the basic part of the pressure measuring assembly 19, which is used to support and fix the bracket 191, the pressure measuring plate 192, the pressure measuring tube 193 and other components. It provides sufficient stability and load-bearing capacity to ensure the normal operation of the pressure measuring assembly 19 during the test. The bracket 191 is a key component connecting the mobile base 190 and the pressure measuring plate 192, which is used to support and fix the pressure measuring plate 192 and the pressure measuring tube 193 thereon. It provides the necessary strength and rigidity to ensure that the pressure measuring plate 192 will not be deformed or displaced during the measurement process. The pressure measuring plate 192 is one of the core components of the pressure measuring assembly 19, which is used to directly withstand and measure the water pressure inside the permeation box 11. When the water pressure inside the permeation box 11 changes, the pressure plate 192 is subjected to the corresponding pressure, and this pressure is transmitted to the pressure tube 193 through the pipeline connected to the pressure hole 18 and the pressure tube 193, and then converted into a measurable signal such as a pressure value. The multiple pressure tubes 193 on the pressure plate 192 are connected to the pressure hole 18 through the pipeline, so that the water pressure inside the permeation box 11 can be accurately transmitted to the pressure tube 193. The pressure tube 193 is a pipeline connecting the pressure plate 192 and a measuring instrument such as a pressure gauge, which is used to transmit the water pressure inside the permeation box 11 to the measuring instrument for measurement. It usually has a sufficient inner diameter and length to ensure that no blockage or leakage occurs during the measurement process. The pressure tube 193 is connected to the pressure plate 192 and the pressure hole 18 through its structure with openings at the top and bottom. When the water pressure inside the permeation box 11 changes, this pressure is transmitted to the pressure tube 193 through the pressure plate 192, and is transmitted to the measuring instrument along the pipeline. After receiving the pressure signal, the measuring instrument converts it into a readable pressure value. The pressure measuring tube 193 can accurately transmit the water pressure inside the permeation box 11 to the measuring instrument for measurement, providing accurate data support for researchers.

[0042] A plurality of card slots are provided in the infiltration box 11, and cards are inserted into the card slots. There are gaps between adjacent cards, and the gaps are configured as dark channels 13. The card slots are structures provided inside the infiltration box 11, and are used to fix and support the cards to ensure that the cards do not move or deform during the test. The card slots cooperate with the cards, and by adjusting the number and position of the cards, dark channels 13 of different shapes and sizes can be flexibly formed to simulate groundwater channels. After the cards are inserted into the card slots, gaps are formed between adjacent cards, and these gaps serve as dark channels 13 to separate and guide water flow. By adjusting the number and position of the cards, groundwater channels of different shapes and sizes can be simulated, and the seepage characteristics under different conditions can be studied. The gaps, as dark channels 13, are the main channels for water flow inside the infiltration box 11. It simulates the flow path of groundwater in soil or rock formations. By observing and analyzing the flow of water in the dark channels 13, the seepage characteristics under different conditions can be studied.

[0043] The water supply mechanism 2 includes a support base 20, a column 21 arranged on the support base 20, and a water supply tank 22 connected to the column 21 through a locking clamp, and the water supply tank 22 is connected to the water injection port 14 through a pipe. The locking clamp is an important connector connecting the column 21 and the water supply tank 22. It provides a reliable connection and fixing effect, so that the water supply tank 22 can be firmly installed on the column 21 and prevent it from shaking or falling off during use. The water supply tank 22 is one of the core components of the water supply mechanism 2. It is used to store and provide water sources to ensure that the water supply mechanism 2 can continuously and stably provide water flow. During the operation of the water supply mechanism 2, the water supply tank 22 is connected to the water injection port 14 through a pipe. When water supply is needed, the water source is injected into the water supply tank 22 and transported to the water injection port 14 through a pipe. Subsequently, the water flows through the water injection port 14 into the infiltration box 11 or other components that need water supply. During the water supply process, the water supply tank 22 always maintains a certain water level and pressure to ensure the stability and continuity of the water flow.

[0044] The overflow mechanism 3 includes a water collecting bucket 30 and an overflow pipe 31 connected between the water collecting bucket 30 and the overflow port 17. The water collecting bucket 30 is a main component of the overflow mechanism 3, and is used to collect and store excess water flowing out of the overflow port 17. The overflow pipe 31 is connected between the water collecting bucket 30 and the overflow port 17, and is a channel for water to flow from the overflow port 17 to the water collecting bucket 30. When the water flow pressure or flow in the system exceeds a preset value, the overflow port 17 will open to allow excess water to pass through. These excess water flows then flow into the water collecting bucket 30 through the overflow pipe 31. During the overflow process, the water collecting bucket 30 will continuously receive and store these water flows until the water flow pressure or flow in the system returns to normal levels.

[0045] The support frame 10 includes a frame body 100, a support table 101 disposed at the upper end of the frame body 100, and a pulley with a brake disposed at the bottom end of the frame body 100. The infiltration box 11 is disposed on the support table 101. Limiting members 102 are disposed at the four corners of the support table 101 to prevent the infiltration box 11 from shifting, and the limiting members 102 are respectively attached to the adjacent sides of the infiltration box 11. The pulley is disposed at the bottom end of the frame body 100 to facilitate the movement and positioning of the support frame 10. The brake is used to fix the support frame 10 when necessary to prevent it from sliding or moving. The limiting members 102 are disposed at the four corners of the support table 101 to prevent the infiltration box 11 from shifting during placement or use, thereby ensuring the safety and accuracy of the test or operation.

[0046] like Figure 4 As shown, the present invention also provides a two-dimensional infiltration slot dark channel filter material filling drainage test method, using a test device to conduct the test, including the following steps:

[0047] S1: Determine the gradation of the filter material filled into the dark channel 13;

[0048] Step S1 specifically includes the following steps:

[0049] S1.1: Measure the basic properties of the soil; understand the basic physical and chemical properties of the soil, such as particle size distribution, density, water content, etc., to provide a basis for the subsequent selection of filter media grading. Ensure that the selection of filter media matches the soil characteristics and improve the overall efficiency of the infiltration system.

[0050] S1.2: Use the Sherrard 1989 method and the Taishag criteria to determine the filter media gradation; these two methods can scientifically determine the particle size distribution of the filter media to ensure the filtration effect and permeability of the filter media. Optimize the filter media gradation to improve the filtration accuracy and permeability of the filter media, while reducing the risk of clogging.

[0051] An example of step S1.2 is as follows:

[0052] Take the existing test soil, soil particle data is shown in Table 1, use the Sherard 1989 method and Taisha standard to calculate the filter material gradation, the results are shown in Table 1, and the soil and filter material gradation curve is shown in Figure 5 .

[0053] Table 1

[0054]

[0055]

[0056] S1.3: Screen the filter material. Screen the filter material in each particle size range according to the required particle size. Screen the filter material according to the required particle size range to ensure that the filter material meets the design requirements. Improve the uniformity and consistency of the filter material to ensure the stable operation of the infiltration system.

[0057] S1.3 The specific operation steps are as follows:

[0058] Taking the existing sieve specifications of 0.08, 0.1, 0.2, 0.6, 1, 2, 4, 8, 12, and 20 mm in the laboratory as an example, filter material screening was carried out.

[0059] S1.3.1: Based on the soil particle size data, the filter material gradation curve is calculated and determined using the Sherrard Filter Criteria 1989 and the Taisha Criteria. The filter material gradation curve is plotted as shown in Figure a.

[0060] S1.3.2 Take the sieve specification as the horizontal axis on the filter material grading curve ( Figure 1 The corresponding ordinate is the mass percentage of filter material smaller than the sieve hole specification, see "The mass percentage of filter material smaller than a certain particle size (%)" in Table 2.

[0061] For example, if the sieve specification is 0.2mm, find the point with abscissa 0.2 in Figure a, and then find the value of the corresponding ordinate under the abscissa, which is 15 in Figure a; if the sieve specification is 0.6mm, find the point with abscissa 0.6 in Figure a, and then find the value of the corresponding ordinate under the abscissa, which is 34 in Figure a; the same applies to other sieve specifications.

[0062] S1.3.3: Calculate the percentage of filter material mass in each particle size range. This can be obtained by subtracting the two adjacent percentages of filter material mass (%) smaller than a certain particle size. For example: particle size range: 0.2-0.6mm, mass percentage: 34-15=19(%); particle size range: 0.6-1mm, mass percentage: 46-34=12(%). See "Percentage of filter material mass in each particle size range (%)" in Table 2.

[0063] S1.3.4: Indoor screening filter material, take the total amount of filter material 1000g as an example, if it is greater than 1000g, multiply it by the proportional coefficient That's it. Calculate the mass of filter material in each particle size range for a total of 1000g of filter material, see Table 2 "Mass of each particle size range per 1000g of mixed filter material (g)". For example, 0.2-0.6mm, 1000×19%=190(g); 0.6-1mm, 1000×12%=120(g).

[0064] Table 2 Filter material screening table

[0065]

[0066] S2: Fill the filter material determined in S1 into the permeation box 11 in a layered filling manner, and perform exhaust and water injection operations from the water injection port 14 at the bottom of the permeation box 11 through the water supply mechanism 2;

[0067] Step S2 specifically includes the following steps:

[0068] S2.1: Lay quartz sand with a thickness of 2cm-4cm and a diameter of 2mm-4mm;

[0069] S2.2: placing a water-permeable partition 12 and laying filter paper on the water-permeable partition 12;

[0070] S2.3: Calculate the dry soil weight required for each layer to fill the soil column according to the required bulk density;

[0071] S2.4: Then, the soil is loaded in layers and compacted with a tamping tool to ensure uniformity of soil density and good contact between adjacent layers;

[0072] By filling in layers, it is possible to ensure uniform distribution of filter material and soil in the infiltration box 11, while improving the density of the soil and the contact quality between layers, enhancing the overall stability and infiltration performance of the infiltration system, and reducing resistance during the infiltration process.

[0073] S2.5: Use a water supply method of injecting water from bottom to top, slowly inject water into the infiltration box 11 through the water injection port 14 below the infiltration box 11, gradually penetrate the soil upwards and discharge the gas; by injecting water from bottom to top, gradually penetrate the soil and discharge the gas, ensure close contact between the soil and the filter material, reduce the interference of bubbles in the infiltration process, and improve the accuracy and reliability of the infiltration system.

[0074] S2.6: After the soil in the infiltration box 11 is completely soaked, the next layer is filled, and saturated exhaust is performed after each filling. After the last layer of soil is completed, a layer of filter paper and a permeable partition 12 are covered on it, and then saturated exhaust is performed. Saturated exhaust is performed after each layer of soil is filled to ensure that the soil and filter material are saturated and reduce water loss during the infiltration process. Improve the water utilization efficiency of the infiltration system and ensure the accuracy of the test results.

[0075] S3: The permeate box 11 is left to stand until the saturation requirement is reached, and then water is slowly injected through the water injection port 14 above the permeate box 11, and the height of the injected water liquid level is controlled through the overflow port 17;

[0076] S4: After the water injection is completed, the bubbles in the pressure measuring tube 193 are discharged to make the water columns in all the pressure measuring tubes 193 at the same height;

[0077] S5: Start the test, conduct flow attenuation analysis of the dark channel 13, permeability analysis of the gravel filter material, soil retention performance analysis of the gravel filter material, and anti-clogging performance analysis of the gravel filter material. Comprehensively evaluate the performance of the filter material gradation in the infiltration box 11 to provide a scientific basis for optimization design and improvement.

[0078] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-dimensional infiltration tank dark channel filter material filling and drainage test device, characterized in that: It comprises an infiltration mechanism (1), a water supply mechanism (2) connected to the infiltration mechanism (1) and providing a water source for the infiltration mechanism (1), and an overflow mechanism (3) connected to the infiltration mechanism (1); The infiltration mechanism (1) comprises a support frame (10), an infiltration box (11) arranged on the support frame (10), a water-permeable baffle (12) arranged above the inside of the infiltration box (11), a blind channel (13) arranged inside the infiltration box (11), and a water injection port (14), a blind channel water outlet (15), a salt detection hole (16), an overflow port (17) and a pressure measuring hole (18) respectively arranged on the infiltration box (11); the blind channel (13) is filled with sand and gravel filter material; the pressure measuring hole (18) is connected to a pressure measuring assembly (19) through a pipeline; the blind channel water outlet (15) is connected to the blind channel (13); the water injection port (14) is respectively located at the upper and lower parts of the infiltration box (11); and the overflow port (17) is located at the upper end of the infiltration box (11).

2. The two-dimensional infiltration tank dark channel filter material filling and drainage test device according to claim 1 is characterized in that: The pressure measuring assembly (19) comprises a movable base (190), a bracket (191) arranged on the movable base (190), a pressure measuring plate (192) arranged on the bracket (191), and a plurality of pressure measuring tubes (193) arranged on the pressure measuring plate (192) and having upper and lower openings. The pressure measuring tubes (193) are connected to the pressure measuring holes (18) via pipelines.

3. The two-dimensional infiltration tank dark channel filter material filling and drainage test device according to claim 1 is characterized in that: The penetration box (11) is provided with a plurality of card slots, cards are inserted into the card slots, gaps are formed between adjacent cards, and the gaps are configured as blind passages (13).

4. The two-dimensional infiltration tank dark channel filter material filling and drainage test device according to claim 1 is characterized in that: The water supply mechanism (2) comprises a support base (20), a column (21) arranged on the support base (20), and a water supply box (22) connected to the column (21) via a locking clamp, and the water supply box (22) is connected to the water injection port (14) via a pipeline.

5. The two-dimensional infiltration tank dark channel filter material filling and drainage test device according to claim 1 is characterized in that: The overflow mechanism (3) comprises a water collecting bucket (30) and an overflow pipe (31) connected between the water collecting bucket (30) and the overflow port (17).

6. The two-dimensional infiltration tank dark channel filter material filling and drainage test device according to claim 1 is characterized in that: The support frame (10) comprises a frame body (100), a support table (101) arranged at the upper end of the frame body (100), and a pulley with a brake arranged at the bottom end of the frame body (100), and the penetration box (11) is arranged on the support table (101).

7. The two-dimensional infiltration tank dark channel filter material filling and drainage test device according to claim 6 is characterized in that: Limiting members (102) for preventing the infiltration box (11) from shifting are arranged at the four corners of the support table (101), and the limiting members (102) are respectively attached to adjacent side surfaces of the infiltration box (11).

8. A two-dimensional infiltration trough dark channel filter material filling and drainage test method, characterized in that: The test device according to any one of claims 1 to 7 is used to carry out the test, comprising the following steps: S1: Determine the gradation of the filter material filled into the dark channel (13); S2: Filling the filter material determined in S1 into the permeation box (11) in a layered filling manner, and performing water injection and exhaust operation from the water injection port (14) at the bottom of the permeation box (11) through the water supply mechanism (2); S3: The permeate box (11) is left to stand until the saturation requirement is reached, and then water is slowly injected through the water injection port (14) above the permeate box (11), and the height of the injected water liquid level is controlled through the overflow port (17); S4: After the water injection is completed, the bubbles in the pressure measuring tube (193) are discharged so that the water columns in all the pressure measuring tubes (193) are at the same height; S5: Start the test and conduct the flow attenuation analysis of the dark channel (13), the permeability analysis of the gravel filter material, the soil retention performance analysis of the gravel filter material, and the anti-clogging performance analysis of the gravel filter material.

9. The two-dimensional infiltration slot dark channel filter material filling and drainage test method according to claim 8, characterized in that: When the filter material gradation is determined in step S1, the following steps are included: S1.1: Determine the basic properties of soil; S1.2: Use the Sherard 1989 method and the Taishaji criteria to determine the filter media gradation; S1.3: Screening the filter material: Screen the filter material in each particle size range according to the required particle size.

10. The two-dimensional infiltration trough dark channel filter material filling and drainage test method according to claim 8, characterized in that: Step S2 includes the following steps: S2.1: Lay quartz sand with a thickness of 2cm-4cm and a diameter of 2mm-4mm; S2.2: placing a water-permeable partition (12), and laying filter paper on the water-permeable partition (12); S2.3: Calculate the dry soil weight required for each layer to fill the soil column according to the required bulk density; S2.4: Then, the soil is loaded layer by layer and compacted with a tamping tool to ensure uniform density of the soil and good contact between adjacent layers; S2.5: adopting a water supply method of injecting water from bottom to top, slowly injecting water into the infiltration box (11) through the water injection port (14) below the infiltration box (11), gradually permeating the soil upwards and discharging gas; S2.6: After the soil in the infiltration box (11) is completely soaked, the next layer is filled, and saturated exhaust is performed after each filling. After the last layer of soil is filled, a layer of filter paper and a permeable partition (12) are covered on it, and then saturated exhaust is performed.

Images