Clogging test device and method

Abstract

The invention discloses a clogging test device and method, and belongs to the technical field of drainage test, the device comprises a clogging model connected with a water supply mechanism and a seepage measuring mechanism; the clogging model comprises a water tank, a drainage pipe, a filter pipe and a cover plate; the water tank is a container with the top open, the top of the water tank is connected with the cover plate to achieve sealing, the water supply mechanism is communicated with the water tank through a water supply opening in the cover plate to supply water, water seepage holes are evenly distributed in the periphery of the filter pipe, and the two ends of the filter pipe are connected with drainage pipes. Therefore, the water seepage amount is measured. The device and the method are suitable for respectively carrying out clogging tests on various preliminarily designed filter layers to obtain the filter layer with the best anti-clogging effect.

Description

Technical Field

[0001] The invention belongs to the technical field of drainage testing, and in particular relates to a clogging testing device and method. Background Art

[0002] With the development of urbanization, my country has entered a stage of large-scale development and utilization of underground space resources dominated by urban rail transit, integrated pipeline corridors, and underground parking. Due to factors such as deep burial depth, small superstructure, and small deadweight, the above-mentioned underground structures need to be designed with necessary anti-floating measures during construction to avoid floating. Among them, drainage and decompression is a commonly used anti-floating technology, but this technology is prone to siltation during use. Therefore, determining the optimal permeability coefficient of the composite filter layer during design becomes a key issue.

[0003] Existing drainage, pressure reduction, and anti-floating technologies primarily involve installing a blind water channel beneath the foundation slab and filling it with a sand filter layer to facilitate drainage. However, as water flows, it can carry fine soil particles into the filter layer, causing clogging. This in turn renders drainage, pressure reduction, and anti-floating ineffective, limiting the technology's widespread adoption. However, proper design of the filter layer parameters can prevent clogging. This requires extensive clogging model testing of the initially designed composite filter layer parameters.

[0004] In summary, the successful application of drainage and decompression anti-floating technology in actual engineering depends on the absence of siltation. The key to avoiding siltation is to conduct a large number of siltation tests on the composite filter layer to obtain reasonable parameter settings and construct the filter layer with the best anti-blocking effect according to reasonable parameters. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a clogging test device and method suitable for conducting clogging tests on a variety of preliminarily designed filter layers to obtain the filter layer with the best anti-clogging effect.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0007] In the first aspect, the present invention provides a clogging test device, including a clogging model connected to a water supply mechanism and a seepage measurement mechanism; the clogging model includes a water trough, a drain pipe, a filter tube and a cover plate; the water trough is a container with an open top, the top of the water trough is connected to the cover plate to achieve sealing, the water supply mechanism is connected to the water trough through the water supply port on the cover plate to supply water, the filter tube is evenly distributed with seepage holes around it and is connected to the drain pipe at both ends, the filter tube in the water trough is sealed and connected through the drain pipe and passes through the side wall of the water trough, and the seepage measurement mechanism is connected to the drain pipe at at least one end outside the water trough to measure the amount of seepage.

[0008] The aforementioned clogging test device has a cover plate further provided with an exhaust valve and a pressure gauge; the exhaust valve is used to exhaust the air in the water tank; the pressure gauge is used to measure the pressure in the water tank; the exhaust valve and the pressure gauge are combined to adjust the pressure in the water tank.

[0009] The aforementioned clogging test device, the clogging model also includes a sealing gasket; the water tank is a square structure welded by four side panels and a bottom plate, the bottom of each side panel is connected to the bottom plate, and the top of each side panel is bent into a connecting platform that fits with the edge of the cover plate. The connecting platform and the edge of the cover plate are provided with matching bolt holes, and the cover plate is sealed and connected to the water tank by bolts and sealing gaskets.

[0010] The aforementioned clogging test device, the clogging model also includes a sealing ring; the side plate is provided with a mounting hole matching the drain pipe; a thread is provided in the middle of the outer circumference of the drain pipe, and each drain pipe is sealed and fixedly connected to the two sides of the side plate mounting hole by two nuts and two sealing rings; the outer walls of both ends of the filter tube are respectively sealed and fixedly connected to the inner walls of the drain pipes at both ends through sealing sleeves to achieve communication inside the pipe.

[0011] The aforementioned clogging test device, when used for clogging tests on soil and filter layers, further comprises a baffle assembly, which is arranged at the bottom of the water tank and connected to the water tank floor via four baffles, forming a filter layer filling space with closed sides and an open top; the height of the baffles is the thickness of the filter layer;

[0012] The edges at both ends of each partition are bent toward each other to form folded edges, and the folded edges of the four partitions are interlocked and connected in pairs in sequence; a support block for supporting the shape of the filter layer filling space is provided in the filter layer filling space.

[0013] The aforementioned clogging test device, the water supply mechanism includes a water supply tank, a bracket and a lifting platform; the bracket includes multiple bracket platforms with different heights; the driving motor of the lifting platform drives the lifting platform to rise and fall; the water supply tank is placed on the lifting platform, the lifting platform is placed on the bracket platform, the water supply tank is connected to the water supply pipe through the water inlet, the water supply tank is connected to the water supply port through the water supply pipe and the water supply valve, the side wall of the water supply tank is connected to the limit pipe that limits the water level height; the water supply pipe supplies water to the water supply tank, the water supply pipe supplies water to the water supply port, and the water that is delivered in excess of the water supplied is discharged from the limit pipe.

[0014] The aforementioned clogging test device, the seepage measuring mechanism includes a measuring bucket and a weight sensor, the measuring bucket is connected to the drainage pipe through the seepage port, the seepage valve and the seepage pipe to collect the seepage water; the weight sensor is used to measure the weight of the measuring bucket; the seepage measuring mechanism also calculates the seepage amount based on the measured weight of the measuring bucket.

[0015] In a second aspect, the present invention provides a clogging test method, which uses the clogging test device described in any one of the first aspects to perform a clogging test. When used for clogging tests on soil and filter layers, the method comprises:

[0016] S1: Determine the soil and filter layer to be tested;

[0017] S2: Fill the soil and filter layer determined in step S1 into the water tank;

[0018] S3: Filling the buffer sand layer on the upper layer of the soil filled in step S2;

[0019] S4: After the buffer sand layer is filled in step S3, the cover plate on the water tank is installed;

[0020] S5: After the cover plate is installed in step S4, the water supply mechanism and the seepage measurement mechanism are installed;

[0021] S6: After the water supply mechanism and the seepage measurement mechanism are installed in step S5, the water supply mechanism is started to supply water to the water tank until it is full;

[0022] S7: After the water tank is filled with water in step S6, a clogging test is started, and the water seepage volume is measured at preset time intervals;

[0023] S8: Calculate the permeability coefficient at each time based on the seepage volume Q calculated in step S7 to obtain the permeability coefficient change of the soil and filter layer determined in step S1; wherein the permeability coefficient k is calculated as follows:

[0024] ,

[0025] Wherein, L is the length of the seepage path, A is the permeable area of the filter tube, H1 is the water supply height, which is the height difference between the water level in the water supply tank (14) and the bottom of the water tank (4), and H2 is the seepage height, which is the height difference between the seepage port of the seepage measuring mechanism and the bottom of the water tank (4).

[0026] The aforementioned clogging test method further includes:

[0027] S9: Replace the filter layer and repeat steps S1 to S8 to obtain the permeability change of different filter layers of the same soil;

[0028] S10: changing the water supply height H1 and the water seepage height H2, and cyclically executing steps S1 to S9 to perform clogging tests under different hydraulic conditions to obtain corresponding changes in permeability coefficients;

[0029] S11: Compare the changes in the permeability coefficient under the test conditions of steps S8 to S10 to obtain the final filter layer with the best anti-blocking effect in the soil of step S1.

[0030] In the aforementioned clogging test method, step S2 includes:

[0031] Assemble the partition assembly and place it at the bottom of the water tank to separate the filter layer filling space, and make the filter tube installation position be located in the filter layer filling space; the partition assembly is set at the bottom of the water tank (4), connected to the bottom surface of the water tank through four partitions, and encloses the filter layer filling space with closed sides and open top; the height of the partition is the thickness of the filter layer (34); wherein, the edges of both ends of each partition are bent toward each other to form folded edges (43), and the folded edges (43) of the four partitions are sequentially interlocked and connected in pairs; a support block for supporting the shape of the filter layer filling space is provided in the filter layer filling space;

[0032] Fill the soil filling space outside the partition and compact the soil to a preset compaction degree;

[0033] After filling and compacting the soil to the height of the partition, remove the support blocks and partitions;

[0034] Seal the filter tube to the drain pipes at both ends;

[0035] Fill the filter layer to the soil height in the filter layer filling space around the filter tube;

[0036] Continue filling the soil to the preset soil filling height.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention designs a clogging test device, which conducts clogging tests on various filter layers with preliminary designs to measure the seepage volume, counts and compares the changes in the permeability coefficients of each filter layer, and obtains the final filter layer with the best anti-clogging effect. Obtaining the filter layer with the best anti-clogging effect is conducive to the successful application of drainage, pressure reduction and anti-floating technology in actual engineering.

[0039] The clogging test device of the present invention is designed with a sealing gasket and a sealing ring to form a sealing simulation clogging model, and a pressure detection and adjustment structure composed of an exhaust valve and a pressure gauge, which is conducive to obtaining accurate test results.

[0040] The clogging test device of the present invention is designed with a partition to separate the filling space of the filter layer, so that the clogging test device of the present invention can more accurately simulate the actual scene of the combination of soil and filter layer, thereby making the test results more accurate.

[0041] The present invention conducts a clogging test on the filter layer obtained by the preliminary design. During the test, different hydraulic conditions are formed by adjusting the head height difference between the water supply height and the seepage height, so as to further determine the filter layer with the best anti-clogging effect under actual hydraulic conditions.

[0042] By replacing the soil, the present invention can measure the filter layer with the best anti-blocking effect for different soils.

[0043] Therefore, the present invention can obtain the optimal filter layer for different soil bodies through experiments, achieve better anti-blocking effect, and make up for the shortcomings of existing drainage, pressure reduction and anti-floating designs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 1 is a schematic cross-sectional view of a clogging test device according to Example 1 of the present invention;

[0045] Figure 2 This is a schematic structural diagram of a water tank 4 of a clogging test device according to Example 1 of the present invention;

[0046] Figure 3 This is a schematic diagram of the assembly effect of a water tank 4, a drain pipe 5 and a filter pipe 6 of a clogging test device according to Example 1 of the present invention;

[0047] Figure 4 This is a schematic diagram of the external structure of a clogging model 1 of a clogging test device according to embodiment 1 of the present invention;

[0048] Figure 5 This is a schematic diagram of a baffle assembly structure of a clogging test device according to Example 1 of the present invention;

[0049] Figure 6 This is a structural schematic diagram of a single-piece partition of a clogging test device in Example 1 of the present invention.

[0050] Description of reference numerals:

[0051] 1-Blocking model; 2-Water supply mechanism; 3-Seepage measurement mechanism; 4-Water trough; 5-Drain pipe; 6-Filter tube; 7-Sealing gasket; 8-Cover plate; 9-Short side plate; 10-Long side plate; 11-Bottom plate; 12-Mounting hole; 13-Bolt; 14-Water supply tank; 15-Bracket; 16-Lifting platform; 17-Water inlet; 18-Limiting pipe; 19-Water pipe; 20-Water supply valve; 21-Water supply pipe; 22-Measuring bucket; 23-weight sensor; 24-air vent; 25-connecting platform; 26-bolt hole; 27-nut; 28-sealing ring; 29-filter; 30-water supply port; 31-exhaust valve; 32-pressure gauge; 33-soil; 34-filter layer; 35-buffer sand layer; 36-water; 37-seepage port; 38-ear plate; 39-seepage valve; 40-long partition; 41-short partition; 42-plastic block; 43-folded edge. DETAILED DESCRIPTION

[0052] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. Unless there is a conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0053] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates an "or" relationship between the related objects.

[0054] Example 1:

[0055] This embodiment introduces a Figure 1 Blockage test device, such as Figure 1 A schematic diagram of a clogging test device is shown, which includes a clogging model 1 connected to a water supply mechanism 2 and a seepage measurement mechanism 3; the clogging model 1 includes a water trough 4, a drain pipe 5, a filter pipe 6 and a cover plate 8; the water trough 4 is a container with an open top, and the top of the water trough 4 is connected to the cover plate 8 to achieve sealing. The water supply mechanism 2 is connected to the water trough 4 through a water supply port 30 on the cover plate 8 to supply water. The filter pipe 6 is evenly distributed with seepage holes around its body and is connected to the drain pipe 5 at both ends. The filter pipe 6 in the water trough 4 is sealed and connected to the drain pipe 5 and passes through the side wall of the water trough 4. The seepage measurement mechanism 3 is connected to the drain pipe 5 at least at one end outside the water trough 4 to measure the amount of seepage;

[0056] A variety of filter layers with preliminary designs are respectively filled into the water tank 4, and a clogging test is carried out to measure the water seepage. The changes in the permeability coefficients of the filter layers are statistically analyzed and compared to obtain the final filter layer with the best anti-clogging effect.

[0057] The specific implementation of the clogging test device of this embodiment is described below:

[0058] like Figure 1 and Figure 4 As shown, to more accurately simulate the actual conditions of a clogging test, the cover plate 8 is further provided with an exhaust valve 31 and a pressure gauge 32. The exhaust valve 31 is used to exhaust air from the water tank 4, and the pressure gauge 32 is used to measure the pressure within the water tank 4. The exhaust valve 31 and the pressure gauge 32 are combined to regulate the pressure within the water tank 4. This facilitates monitoring pressure changes within the water tank 4 and timely adjustment of the pressure within the water tank 4, thereby avoiding test errors caused by pressure differences between different filter layers during clogging tests under the same hydraulic conditions.

[0059] In order to facilitate observation of the situation in the water tank 4, the cover plate 8 is a transparent organic glass plate.

[0060] In order to improve the sealing effect of the cover plate 8 and the water tank 4, the clogging model 1 also includes a sealing gasket 7; the water tank 4 is a square structure welded by four side panels and a bottom plate 11, the bottom of each side panel is connected to the bottom plate 11, and the top of each side panel is bent into a connecting platform 25 that fits with the edge of the cover plate 8. The connecting platform 25 and the edge of the cover plate 8 are provided with matching bolt holes 26, and the cover plate 8 is sealed and connected to the water tank 4 through bolts 13 and the sealing gasket 7.

[0061] like Figure 2 As shown, the sink 4 of this embodiment is a rectangular parallelepiped welded from five stainless steel plates: two short side panels 9, two long side panels 10, and a bottom panel 11. Each of the four side panels is folded 90 degrees at the top to form a connecting platform 25, which is provided with bolt holes 26. To enhance the structural stability of the sink 4, multiple lugs 38 are welded between the long side panels 10 and the connecting platforms 25, and between the long side panels 10 and the bottom panel 11. In this embodiment, three triangular lugs 38 are welded to each of the upper and lower edges of the long side panels 10.

[0062] In order to improve the sealing effect of the drain pipe 5 and the sink 4, the clogging model 1 also includes a sealing ring 28; the side plate is provided with a mounting hole 12 matching the drain pipe 5; Figure 2 As shown, the two short side plates 9 each have a mounting hole 12 at the bottom; the middle of the outer periphery of the drain pipe 5 is provided with a thread, and each drain pipe 5 is sealed and fixed to both sides of the side plate mounting hole 12 by two nuts 27 and two sealing rings 28; combined Figures 1 to 4 As shown, the drain pipe 5 is a stainless steel pipe with an outer thread. Each drain pipe 5 is inserted into the mounting hole 12 at the lower part of the short side plate 9 and is fixed to the short side plate 9 through two nuts 27 and a sealing ring 28 inside and outside the water tank 4. Figure 1 and Figure 3 As shown, the inner diameter of the drain pipe 5 is larger than that of the filter pipe 6. The outer walls at both ends of the filter pipe 6 are sealed and fixedly connected to the inner walls of the drain pipe 5 at both ends through sealing sleeves respectively, thereby achieving internal communication within the pipe.

[0063] The clogging test device of this embodiment takes into account the actual application scenario of the combination of soil 33 and filter layer 34. In actual application, the soil 33 wraps the filter layer 34, and the filter layer 34 wraps the drainage device.

[0064] In order to better fit the actual application scenario and make the test results of the clogging test device of the present invention more accurate, when used for the clogging test of the soil 33 and the filter layer 34, the clogging test device of this embodiment needs to simulate the filling conditions of the soil and the filter layer. The clogging model 1 also includes a partition assembly, which is arranged at the bottom of the water tank 4 and connected to the bottom surface of the water tank through four partitions to form a filter layer filling space with closed sides and an upper opening; the height of the partition is the preset thickness of the filter layer 34;

[0065] The edges at both ends of each partition are bent toward each other to form folded edges 43 , and the folded edges 43 of the four partitions are interlocked in pairs in sequence; a support block for supporting the shape of the filter layer filling space is provided in the filter layer filling space.

[0066] like Figure 5 and Figure 6 As shown, the partition assembly includes a set of long partitions 40 and a set of short partitions 41; the support block is a plastic block 42, and the edges of each long partition 40 and short partition 41 are bent toward each other to form a folded edge 43; Figure 5 As shown, during assembly, first stand two long partitions 40 in parallel, then evenly place five plastic blocks 42 between the long partitions 40, and finally snap the short partitions 41 onto the two ends of the long partitions 40 through the folded edges 43 to form a stable box body.

[0067] The two sides of the short partition 41 are respectively limited to the folded edge 43 of the long partition 40 and the drain pipe 5; the two sides of the long partition 40 are respectively limited to the folded edge 43 of the short partition 41 and the plastic block 42, so that the folded edges 43 of the four partitions are interlocked and connected in pairs;

[0068] In another embodiment, the four partition folding edges 43 are interlocked and connected in pairs in sequence, which can be achieved by staggered clamping of the folding edges 43 in pairs; a specific clamping method is: the outer wall of the right folding edge 43 of the front long partition 40 fits into the inner wall of the left folding edge 43 of the right short partition 41, the outer wall of the right folding edge 43 of the right short partition 41 fits into the inner wall of the left folding edge 43 of the rear long partition 40, the outer wall of the right folding edge 43 of the rear long partition 40 fits into the inner wall of the left folding edge 43 of the left short partition 41, and the outer wall of the right folding edge 43 of the left short partition 41 fits into the inner wall of the left folding edge 43 of the front long partition 40.

[0069] like Figure 1 and Figure 3 As shown, the filter tube 6 is provided with plum blossom-shaped water seepage holes, and the outer periphery of the filter tube 6 is wrapped with a filter screen 29. In this embodiment, the filter screen 29 is made of geotextile or gauze.

[0070] When used for the clogging test of the soil body 33 and the filter layer 34, the filling method of the soil body (33) and the filter layer (34) for the clogging test includes:

[0071] Assemble the partition assembly, place it at the bottom of the water tank to separate the filter layer filling space, and make the filter tube installation position located in the filter layer filling space;

[0072] Fill and compact the soil 33 in the soil filling space outside the partition to the height of the partition;

[0073] Take out the plastic block 42, the long partition 40 and the short partition 41 in sequence;

[0074] Insert the filter tube 6 into the drain pipe 5 to complete the installation of the filter tube 6;

[0075] Fill the filter layer filling space around the filter tube 6 in the partition with the filter layer 34 to the height of the surrounding soil;

[0076] The soil body 33 is continuously filled to a predetermined soil body filling height. In this embodiment, the thickness of the soil body to be continuously filled is not less than 0.1 meters.

[0077] When filling, the filling should be done in layers and compacted so that the compaction inside and outside the partition and at the upper and lower heights reach the preset compaction standards to avoid compaction deviation affecting the test results.

[0078] like Figure 1 As shown, the water supply mechanism 2 includes a water supply tank 14, a bracket 15 and a lifting platform 16;

[0079] The bracket 15 includes multiple bracket platforms with different heights; the driving motor of the lifting platform 16 drives the lifting platform 16 to rise and fall; the water supply tank 14 is placed on the lifting platform 16, and the lifting platform 16 is placed on the bracket platform. The water supply tank 14 is connected to the water supply pipe 19 through the water supply port 17, and the water supply tank 14 is connected to the water supply port 30 through the water supply pipe 21 and the water supply valve 20. The side wall of the water supply tank 14 is connected to the limit pipe 18 that limits the water level height; the water supply pipe 19 supplies water to the water supply tank 14, and the water supply pipe 21 supplies water to the water supply port 30. The water that is delivered more than the water supplied is discharged from the limit pipe 18.

[0080] The height difference between the water level in the water supply tank 14 and the bottom of the water tank 4 is the water supply height. The water supply height of the clogging test device in this embodiment is determined by the combination of the support platform height, the lifting platform height, and the water level in the water supply tank 14. In this embodiment, the water level in the water supply tank 14 is stabilized by a limit tube 18. Adjusting the height of the support platform and lifting platform on which the water supply tank 14 is mounted allows for adjustment of the water supply height. Specifically, this involves coarse adjustment of the water supply height using different support platforms on the support 15, followed by fine adjustment using the lifting platform 16.

[0081] The specific stabilization process is as follows: the water supply pipe 19 supplies water to the water supply tank 14, and the water supply pipe 21 supplies water to the water supply port 30. After reaching the preset water supply height, the excess water overflows from the limiting pipe 18, so that the water tank 4 can maintain the preset water supply height when continuously supplying water.

[0082] like Figure 1 As shown, the seepage measurement mechanism 3 includes a measuring bucket 22 and a weight sensor 23. The measuring bucket 22 is connected to the drain pipe 5 through the seepage port 37, the seepage valve 39 and the seepage pipe 21 to collect the seepage water; the weight sensor 23 is used to measure the weight of the measuring bucket 22;

[0083] The seepage measurement mechanism also calculates the seepage amount based on the measured weight of the measuring bucket 22. Figure 1 As shown, the seepage measuring mechanism 3 is connected to the left drainage pipe 5, and the right drainage pipe 5 is sealed with a plug. The weight sensor 23 is hoisted to weigh the measuring bucket hoisted below the weight sensor 23. The measuring bucket 22 is provided with a vent hole 24 to maintain the air pressure in the bucket and facilitate the collection of seepage water.

[0084] Figure 1 In the figure, the water supply mechanism 2 and the seepage measurement mechanism 3 are only used as structural diagrams, and should not be regarded as the position diagrams and structural height diagrams of the water supply mechanism 2 and the seepage measurement mechanism 3 being actually arranged on the left and right sides of the blockage model 1.

[0085] Example 2:

[0086] Based on the same inventive concept as Example 1, this example introduces a clogging test method. The clogging test device described in Example 1 is used to perform a clogging test. When used for clogging tests on soil and filter layers, the method includes:

[0087] S1: Determine the soil 33 and filter layer 34 to be tested;

[0088] S2: Fill the soil and filter layer determined in step S1 into the water tank 4;

[0089] S3: Filling the buffer sand layer 35 on the upper layer of the soil 33 filled in step S2;

[0090] S4: After the buffer sand layer 35 is filled in step S3, the cover plate 8 on the water tank 4 is installed;

[0091] S5: After the cover plate 8 is installed in step S4, the water supply mechanism 2 and the seepage measurement mechanism 3 are installed;

[0092] S6: After the water supply mechanism 2 and the seepage measurement mechanism 3 are installed in step S5, the water supply mechanism 2 is started to supply water to the water tank 4 until it is full of water;

[0093] S7: After the water tank 4 is filled with water in step S6, a clogging test is started, and the water seepage volume is measured at preset time intervals;

[0094] S8: Calculate the permeability coefficient at each time based on the seepage volume Q calculated in step S7 to obtain the permeability coefficient change of the soil and filter layer determined in step S1; wherein the permeability coefficient k is calculated as follows:

[0095] ,

[0096] Where L is the seepage path length, A is the permeable area of the filter tube 6, H1 is the water supply height, which is the height difference between the water level in the water supply tank 14 and the bottom of the water tank 4, and H2 is the seepage height, which is the height difference between the seepage port 37 of the seepage measuring mechanism 3 and the bottom of the water tank 4. In this embodiment, the seepage path length is set to the length of the seepage tube 21.

[0097] In order to obtain the final filter layer with the best anti-clogging effect, the clogging test method also includes:

[0098] S9: Replace the filter layer 34 and repeat steps S1 to S8 to obtain the change of the permeability coefficient of different filter layers 34 of the same soil 33;

[0099] S10: changing the water supply height H1 and the water seepage height H2, and cyclically executing steps S1 to S9 to perform clogging tests under different hydraulic conditions to obtain corresponding changes in permeability coefficients;

[0100] Adjust the difference between the water supply height H1 and the seepage height H2 to form different hydraulic conditions.

[0101] By simulating clogging tests under different hydraulic conditions, we can understand the impact of hydraulic condition changes on different filter layers, which is helpful to further determine the filter layer with the best anti-clogging effect under actual hydraulic conditions.

[0102] S11: Compare the changes in the permeability coefficient under the test conditions of steps S8 to S10 to obtain the final filter layer with the best soil anti-blocking effect in step S1.

[0103] By changing the soil and repeating the above steps, the final filter layer with the best anti-blocking effect for different soils can be obtained.

[0104] In a specific embodiment, it is assumed that the clogging test data of the three initially designed filter layers A, B and C are as follows:

[0105] Table 1 Clogging test data of filter layers A, B and C under the same hydraulic conditions

[0106]

[0107] The attenuation rate calculation formula is:

[0108] ,

[0109] Where k t is the permeability coefficient after 24 hours,

[0110] Conclusion: The filter layer A of the preliminary design has the best anti-blocking effect, the lowest attenuation rate and the longest maintenance time, and is the final filter layer determined in this experiment.

[0111] In specific implementation:

[0112] Step S2 includes:

[0113] Assemble the partition assembly and place it at the bottom of the water tank to separate the filter layer filling space, and ensure that the filter tube installation position is located in the filter layer filling space; the partition assembly is set at the bottom of the water tank 4 and connected to the bottom surface of the water tank through four partitions, forming a filter layer filling space with closed sides and open at the top; the height of the partition is equal to the thickness of the filter layer 34; wherein, the two ends of each partition are bent toward each other to form a folded edge 43, and the folded edges 43 of the four partitions are sequentially interlocked; a support block is provided in the filter layer filling space to support the shape of the filter layer filling space;

[0114] Filling and compacting the soil 33 in the soil filling space outside the partition to a preset compaction degree;

[0115] After filling and compacting the soil 33 to the height of the partition, remove the support blocks and partitions;

[0116] Seal the filter tube 6 to the drain pipes 5 at both ends;

[0117] Fill the filter layer 34 to the soil height in the filter layer filling space around the filter tube 6;

[0118] Continue filling the soil 33 to the preset soil filling height.

[0119] In step S6, Figure 1 As shown, starting the water supply mechanism 2 to supply water to the water tank 4 until it is full includes:

[0120] Water is supplied to the water supply tank 14 of the water supply mechanism 2 to a preset water supply height in advance, and the water supply valve 20 and the exhaust valve 31 are opened. The water from the water supply mechanism 2 flows into the water tank 4 through the water supply pipe 21 and the water supply port 30, and the exhaust valve 31 discharges the air in the water tank 4. After the water tank 4 is filled with water 36, when water 36 overflows from the valve port of the exhaust valve 31, the water supply valve 20 and the exhaust valve 31 are closed.

[0121] The process of the water supply mechanism 2 delivering water to the water supply tank 14 and supplying water to the water tank 4 can be achieved by driving with a water pump, driving with an air pump, or the coordinated action of the two.

[0122] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0123] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0124] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0125] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0126] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A clogging test device, characterized in that: A clogging model (1) comprising a water supply mechanism (2) and a seepage measurement mechanism (3); The clogging model (1) includes a water tank (4), a drain pipe (5), a filter pipe (6) and a cover plate (8); The water tank (4) is a container with an opening at the top. The top of the water tank (4) is connected to a cover plate (8) to achieve sealing. The water supply mechanism (2) is connected to the water tank (4) through a water supply port (30) on the cover plate (8) to supply water. The filter tube (6) is evenly distributed with seepage holes around its entire body and is connected to the drain pipe (5) at both ends. The filter tube (6) in the water tank (4) is sealed and connected to the drain pipe (5) and penetrates the side wall of the water tank (4). The seepage measuring mechanism (3) is connected to the drain pipe (5) at least at one end outside the water tank (4) to measure the amount of seepage.

2. The clogging test device according to claim 1, characterized in that: The cover plate (8) is also provided with an exhaust valve (31) and a pressure gauge (32); The exhaust valve (31) is used to exhaust the air in the water tank (4); the pressure gauge (32) is used to measure the pressure in the water tank (4); the exhaust valve (31) and the pressure gauge (32) are combined to adjust the pressure in the water tank (4).

3. The clogging test device according to claim 1, characterized in that: The clogging model (1) further includes a sealing gasket (7); The water tank (4) is a square structure formed by welding four side plates and a bottom plate (11). The bottom of each side plate is connected to the bottom plate (11). The top of each side plate is bent into a connecting platform (25) that fits with the edge of the cover plate (8). Matching bolt holes (26) are provided on the edge of the connecting platform (25) and the cover plate (8). The cover plate (8) is sealed and connected to the water tank (4) through bolts (13) and sealing gaskets (7).

4. The clogging test device according to claim 1, characterized in that: The clogging model (1) further includes a sealing ring (28); The side plate is provided with a mounting hole (12) matching the drain pipe (5); A thread is provided at the middle portion of the outer periphery of the drain pipe (5), and each drain pipe (5) is sealed and fixed to both sides of the side plate mounting hole (12) through two nuts (27) and two sealing rings (28); The outer walls of both ends of the filter tube (6) are sealed and fixedly connected to the inner walls of the drainage pipes (5) at both ends through sealing sleeves, thereby achieving internal communication within the pipes.

5. The clogging test device according to claim 1, characterized in that: The clogging model (1) further includes a partition assembly, which is arranged at the bottom of the water tank (4) and connected to the bottom of the water tank through four partitions, forming a filter layer filling space with closed sides and an open top; the height of the partition is the thickness of the filter layer (34); Wherein, the edges at both ends of each partition are bent toward each other to form folded edges (43), and the folded edges (43) of the four partitions are interlocked and connected in pairs in sequence; A support block for supporting the shape of the filter layer filling space is provided in the filter layer filling space.

6. The clogging test device according to claim 1, characterized in that: The water supply mechanism (2) comprises a water supply tank (14), a bracket (15) and a lifting platform (16); The bracket (15) includes a plurality of bracket platforms of different heights; a driving motor of the lifting platform (16) drives the lifting platform (16) to move up and down; The water supply tank (14) is placed on the lifting platform (16), and the lifting platform (16) is placed on the support platform. The water supply tank (14) is connected to the water supply pipe (19) through the water supply port (17). The water supply tank (14) is connected to the water supply port (30) through the water supply pipe (21) and the water supply valve (20). The side wall of the water supply tank (14) is connected to the limit pipe (18) for limiting the water level height. The water delivery pipe (19) delivers water to the water supply tank (14), and the water supply pipe (21) supplies water to the water supply port (30). The water delivered in excess of the water supplied is discharged from the limiting pipe (18).

7. The clogging test device according to claim 1, characterized in that: The permeation measuring mechanism (3) comprises a measuring barrel (22) and a weight sensor (23). The measuring bucket (22) is connected to the drainage pipe (5) through the seepage port (37), the seepage valve (39) and the seepage pipe (21) to collect the seepage water; The weight sensor (23) is used to measure the weight of the measuring bucket (22); The seepage measuring mechanism (3) also calculates the seepage amount based on the measured weight of the measuring bucket (22).

8. A clogging test method, characterized in that: A clogging test device according to any one of claims 1 to 7 is used to conduct a clogging test, and when used for a clogging test on a soil body and a filter layer, the device comprises: S1: Determine the soil to be tested (33) and the filter layer (34); S2: Filling the soil (33) and filter layer (34) determined in step S1 into the water tank (4); S3: Filling a buffer sand layer (35) on top of the soil (33) filled in step S2; S4: After the buffer sand layer (35) is filled in step S3, the cover plate (8) on the water tank (4) is installed; S5: After the cover plate (8) is installed in step S4, the water supply mechanism (2) and the seepage measurement mechanism (3) are installed; S6: After the water supply mechanism (2) and the seepage measurement mechanism (3) are installed in step S5, the water supply mechanism (2) is started to supply water to the water tank (4) until it is full of water; S7: After the water tank (4) is filled with water in step S6, a clogging test is started, and the water seepage volume is measured at a preset time interval; S8: Calculate the permeability coefficient at each time based on the seepage volume Q calculated in step S7 to obtain the permeability coefficient change of the soil and filter layer determined in step S1; wherein the permeability coefficient k is calculated as follows: ， Wherein, L is the length of the seepage path, A is the permeable area of the filter tube (6), H1 is the water supply height, which is the height difference between the water level in the water supply tank (14) and the bottom of the water tank (4), and H2 is the seepage height, which is the height difference between the seepage port (37) of the seepage measuring mechanism (3) and the bottom of the water tank (4).

9. The clogging test method according to claim 8, characterized in that: Also includes: S9: Replace the filter layer (34), and execute steps S1 to S8 cyclically to obtain the change of the permeability coefficient of different filter layers (34) of the same soil body (33); S10: changing the water supply height H1 and the water seepage height H2, and cyclically executing steps S1 to S9 to perform clogging tests under different hydraulic conditions to obtain corresponding changes in permeability coefficients; S11: Compare the changes in the permeability coefficient under the test conditions of steps S8 to S10 to obtain the final filter layer with the best anti-blocking effect in the soil of step S1.

10. The clogging test method according to claim 8 or 9, characterized in that: Step S2 includes: Assemble the partition assembly and place it at the bottom of the water tank to separate the filter layer filling space, and make the filter tube installation position be located in the filter layer filling space; the partition assembly is set at the bottom of the water tank (4), connected to the bottom surface of the water tank through four partitions, and encloses the filter layer filling space with closed sides and open top; the height of the partition is the thickness of the filter layer (34); wherein, the edges of both ends of each partition are bent toward each other to form folded edges (43), and the folded edges (43) of the four partitions are sequentially interlocked and connected in pairs; a support block for supporting the shape of the filter layer filling space is provided in the filter layer filling space; Filling and compacting the soil (33) in the soil filling space outside the partition to a preset compaction degree; After filling and compacting the soil (33) to the height of the partition, the support blocks and the partition are removed; Seal the filter tube (6) and the drain pipes (5) at both ends; Filling the filter layer (34) in the filter layer filling space on the periphery of the filter tube (6) to the height of the soil; Continue filling the soil (33) to the preset soil filling height.

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