A device for simulating weathering and clogging of blind drain filler and an evaluation method
By constructing devices such as outer sheath, outer cylinder, inner cylinder, and inner protective pipe, the weathering and clogging process of blind drain filler is simulated, solving the problem of lack of experimental equipment in the existing technology. This enables the simulation and evaluation of weathering and clogging of blind drain filler, and improves the safety and stability of the spoil disposal site.
Patent Information
- Application Number
- CN202611361087.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-03
- Publication Date
- 2026-11-03
AI Technical Summary
The lack of experimental equipment to directly simulate the weathering and clogging process of blind drain filler in existing technologies limits research in this area, resulting in reduced drainage performance of blind drains in spoil heaps after clogging, and posing safety and stability risks.
The device, composed of components such as an outer sheath, outer cylinder, inner cylinder, inner protective pipe, base, and water level pipe, simulates the weathering and clogging process of blind drain filler by simulating rainfall and hot air treatment. Combined with circulating water and hot air, it simulates rainwater infiltration and filler weathering in blind drains, accelerates the weathering process, and measures the permeability coefficient of blind drains at different depths after clogging.
It realizes the simulation of weathering and fine particle migration coupled to blockage of blind drain filler, evaluates the impact of weathering and blockage on blind drain drainage performance, makes up for the testing deficiencies of existing technologies, and is simple to operate and reusable.
Smart Images
Figure CN123028864A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of soil and water conservation, and more particularly to the simulation and evaluation of weathering and blockage of blind drains. Background Technology
[0002] Large-scale infrastructure construction generates a significant amount of solid waste annually, including construction waste, slag, and tailings. Much of this solid waste cannot be utilized promptly and is disposed of at slag heaps. These slag heaps are often located on the outskirts of cities or near critical infrastructure projects. Due to their large catchment areas, these slag heaps pose high safety risks and are prone to accidents.
[0003] Therefore, to ensure the safety of spoil heaps, blind drains must be installed inside the spoil heaps to drain water in a timely manner, preventing the water level from rising and improving the safety and stability of the spoil heaps. The filler material for these blind drains is generally sourced locally to reduce construction costs. Some blind drains are constructed using moderately weathered mudstone. Prolonged water immersion, drainage, and repeated immersion will cause the filler material to disintegrate, forming fine particles that clog the pores of the blind drain. Furthermore, the spoil material above the blind drain is often of complex types; under the influence of rainwater, fine particles can also be carried into the blind drain by infiltrating rainwater, further clogging the pores. Once the blind drain is clogged, the drainage performance of the spoil heap will be greatly reduced, potentially causing a rise in the risk water level and inducing safety and stability problems. Therefore, research and evaluation of the weathering and clogging of blind drain filler material are of great significance. However, the current lack of experimental equipment to directly simulate the weathering and clogging process of blind drains greatly limits this research.
[0004] To address the aforementioned technical problems, this invention provides a device and evaluation method for simulating the weathering and clogging process of blind drain filler, comprising simple components such as an outer sheath, outer cylinder, inner cylinder, inner protective pipe, base, and water level pipe.
[0005] By sprinkling water on the sandy surface, rainwater is evenly infiltrated into the waste soil and blind drain filler, then seeps out from around the outer cylinder. This simulates the process of rainwater infiltration and horizontal drainage in a natural waste disposal site. Rainwater also carries the waste soil into the pores of the blind drain filler, simulating the condition of the blind drain being blocked by the upper fine soil. Simultaneously, a blower is used to blow hot air into the inner cylinder, accelerating the weathering of the blind drain filler. Ultimately, this simulates the coupled weathering and fine particle migration of the filler to block the blind drain. Furthermore, it allows for testing the soil permeability coefficient at different depths of the blind drain after blocking, evaluating the impact of weathering and blocking on the drainage performance of the blind drain, and filling a gap in existing testing technologies in the field of soil and water conservation. Summary of the Invention
[0006] This invention provides an apparatus and evaluation method for simulating the weathering and clogging process of blind drain filler. The filler zone is constructed using an outer cylinder and an inner cylinder. The weathering of the blind drain filler and the clogging of the blind drain by the upper waste soil material can be accelerated by means of circulating water and heat. At the same time, water is injected from the inside to the outside, and the hydraulic gradient is measured to determine the permeability coefficient of the blind drain filler at different depths, thereby evaluating the clogging situation of the blind drain.
[0007] The significant advantage of this invention lies in the simple operation of the device, which can realize the simulation of the coupling of filler weathering and fine particle migration in blind drains, and can also realize the soil permeability coefficient test at different depths of blind drains after plugging, evaluate the effect of weathering and plugging on the drainage performance of blind drains, and make up for the lack of existing testing technology in the field of soil and water conservation.
[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:
[0009] A device for simulating the weathering and clogging process of blind drain filler includes the following structure:
[0010] Outer sleeve 1, outer cylinder 2, inner cylinder 3, and inner protective tube 4 are nested from the outside to the inside. The outer sleeve 1 is fitted with the outer cylinder 2, and the inner protective tube 4 is fitted with the inner cylinder 3. The inner protective tube 4 is engaged by the protruding guide groove on the inner side of the inner cylinder 3 and can slide along the axial direction of the inner cylinder 3.
[0011] The outer cylinder 2 and the inner cylinder 3 are fixedly connected to the base 8; a cavity that can accommodate the test packing is formed between the outer cylinder 2 and the inner cylinder 3; multiple holes are provided on both the outer cylinder 2 and the inner cylinder 3 to allow water or gas to flow out smoothly; the outer sheath 1 and the inner protective tube 4 can prevent water from flowing out.
[0012] The outer sheath 1 is detachably connected to the device, and the height of the outer sheath 1 can be adjusted according to the test height when testing the soil layer at different heights.
[0013] The water level pipe 9 is detachably and sealed to the hole on the wall of the outer cylinder 2, so that the water level pipe 9 and the water in the outer cylinder 2 are connected; the water level at the wall of the outer cylinder 2 can be read by the scale on the water level pipe; multiple water level pipes can be installed so that the average water level can be obtained.
[0014] Preferably, the height adjustment method of the outer sheath 1 is as follows: it includes multiple assemblable components, each assemblable component has an outer sheath groove 101 and an outer sheath protrusion 102 at its upper and lower ends, respectively, and a sealing ring is set in the outer sheath groove 101 or on the outer sheath protrusion 102. The outer sheath protrusion 102 is inserted into another outer sheath groove 101 to compress the sealing ring. The multiple assemblable components are interlocked to form the outer sheath 1 as a whole. The bottom of the outer sheath 1 is connected to the base 8 in a plug-in manner with the sealing ring to form a sealed cylinder structure to prevent water from flowing out.
[0015] An alternative is to provide a groove on the outer ring of the base 8, with a sealing ring inside the groove; the outer sleeve protrusion 102 at the bottom of the outer sleeve 1 is pressed into the groove of the base 8.
[0016] Preferably, the outer sheath 1, outer cylinder 2, inner cylinder 3, and inner protective tube 4 are made of acrylic sheet or lightweight high-strength aluminum alloy; the water level tube is transparent and visible, and is made of transparent acrylic sheet material.
[0017] Preferably, the water level pipe 9 is connected to the outer cylinder 2 by inserting an outer rubber ring into a hole in the wall of the outer cylinder 2, thereby connecting the water level pipe 9 with the water in the outer cylinder 2.
[0018] The present invention also provides a method for simulating and evaluating the weathering and clogging process of blind drain filler using the above-mentioned device, comprising the following steps:
[0019] Step 1: Install the outer cylinder 2 and inner cylinder 3 of the device. Fill the blind drain filler 7, waste soil 6, and sand 5 between the outer cylinder 2 and inner cylinder 3 from bottom to top, and compact them as required.
[0020] Step 2: Insert the inner protective tube 4 into the inner cylinder 3 along the raised guide groove on the inner side of the inner cylinder 3, and insert it into the base to prevent water from flowing out of the inner cylinder; at this time, the outer protective sleeve 1 is not installed on the device.
[0021] Step 3: Using a simulated rainfall device, water is sprayed onto the surface of sand 5; the sand layer evens out the rainwater, allowing it to infiltrate evenly into the waste soil and blind drain filler, and then seep out through the densely distributed holes on the surface of the outer cylinder 2, thus simulating the process of rainwater infiltration into the filler and horizontal drainage of the blind drain in a natural waste disposal site; during the rainwater infiltration process, the rainwater carries the waste soil into the pores of the blind drain filler, simulating the condition of the blind drain being blocked by the upper fine soil;
[0022] In addition, due to the obstruction of the inner protective pipe, rainwater will not flow into the inner cylinder 3, and water can only flow out through the outer cylinder 2;
[0023] Step 4: After the rainfall stops, remove the inner protective pipe 4 and use a blower to blow hot air into the inner cylinder 3. The air is blown out through the outer cylinder 2. The hot air can heat the blind drain filler and accelerate drying. Under the action of water and heat, the blind drain filler can achieve accelerated weathering. Since the inner cylinder 3 penetrates the entire soil layer, when hot air is passed through, the entire soil layer can be ventilated and heated.
[0024] Step 5, repeating steps 2 to 4, can quickly simulate the weathering and clogging process of blind drain filler;
[0025] Step 6: After completing Step 5, insert the inner protective pipe 4 along the inner cylinder 3 until the bottom of the inner protective pipe 4 reaches the top of the soil layer where the permeability coefficient of the blind drain filler needs to be tested.
[0026] Install the outer sheath 1 until the top of the outer sheath 1 reaches the bottom of the soil layer to be tested;
[0027] Insert multiple water level pipes 9 into the holes on the surface of the outer cylinder 2. The installation height of the water level pipes 9 is the bottom height of the soil layer to be measured and the top of the outer sheath 1.
[0028] Step 7: Water is injected into the inner protective pipe 4 by a servo water pump to keep the water level at the bottom of the inner protective pipe 4; the water flows horizontally from the inner cylinder 3 through the blind drain packing and finally flows out from the outer cylinder 2.
[0029] The blocking effect of the inner protective pipe 4 allows water to flow out only through the inner cylinder 3 below the bottom of the pipe, preventing water from seeping into the soil layer above. This ensures that water can only seep into the soil layer to be tested, thus guaranteeing the water inflow surface position of the soil layer to be tested.
[0030] The outer sheath 1 prevents water from flowing out from below the bottom of the soil layer being tested, and only allows it to flow out through the soil layer being tested, thus ensuring the location of the water outflow surface in the soil layer being tested.
[0031] Step 8: After the water flow stabilizes, the water level at the outer cylinder wall is measured using water level pipes, and the average value of multiple water level pipes is recorded as h1; the height from the bottom of the inner protective pipe to the bottom of the soil layer to be tested is h0; the flow rate q after stabilization is recorded by the servo pump. The permeability coefficient of the soil layer can then be calculated using the following formula:
[0032]
[0033] In the formula: Permeability coefficient (m / d); This is a correction factor; d is the flow rate (m³ / d); D is the inner diameter of the outer cylinder (m); d is the outer diameter of the inner cylinder (m).
[0034] Preferably, the method further includes step 9: repeating steps 6 to 8 to measure the permeability coefficient at different depths of the blind drain filler; and analyzing the impact of weathering and clogging on the drainage performance of the blind drain by analyzing the changes in permeability coefficient.
[0035] The present invention also provides the application of the above-described apparatus or method in the simulation of weathering and clogging processes of blind drain filler.
[0036] The present invention has the following technical effects:
[0037] 1. It can simulate the process of rainwater infiltration and horizontal drainage of blind drains in natural spoil heaps, and also simulate the entry of rainwater carrying fine soil particles from spoil into the pores of the blind drain filler. Furthermore, under conditions of circulating water and hot air, it can accelerate the weathering of the blind drain filler. The entire device achieves simulation of the coupling of filler weathering and fine particle migration in the blocking of blind drains.
[0038] 2. The device uses the principle of reinjection to test the soil permeability coefficient at different depths of the blind ditch after plugging, evaluating the impact of weathering and plugging on the drainage performance of the blind ditch. Furthermore, the device has few components, is simple to operate, and is reusable.
[0039] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description
[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:
[0041] Figure 1 This is a top view of the device;
[0042] Figure 2 This is a cross-sectional view of the device;
[0043] Figure 3 This is a three-dimensional schematic diagram of the device;
[0044] Figure 4 This is a cross-sectional view of the internal structure of the device;
[0045] Figure 5 This is a schematic diagram of the device before backfilling.
[0046] Figure 6 This is a schematic diagram of the device after backfilling.
[0047] Figure 7 This is a schematic diagram of the rainwater infiltration system.
[0048] Figure 8 A schematic diagram of the device circulating hot gas;
[0049] Figure 9 This is a schematic diagram of a permeability coefficient test.
[0050] The attached diagram is labeled as follows: 1-outer sheath; 2-outer cylinder; 3-inner cylinder; 4-inner protective pipe; 5-sand; 6-waste fine soil; 7-blind drain filler; 8-base; 9-water level pipe; 10-water level line; 11-rainwater infiltration path direction; 12-hot air flow direction; 101-outer sheath groove; 102-outer sheath protrusion. Detailed Implementation
[0051] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0052] Example 1
[0053] A certain waste disposal site covers an area of nearly 1,000 acres with a huge catchment area. To ensure the safety of the waste disposal site, a trapezoidal cross-section blind ditch with dimensions of 5m (bottom width) × 3m (top width) × 2m (height) was used for drainage. The filler material of the blind ditch is medium-differentiated mudstone, while the main filler material of the waste disposal site is [missing information]. To investigate the weathering resistance and clogging resistance of this blind ditch, the device of this invention was used for testing.
[0054] The device includes an outer sheath 1 (inner diameter 1.2m, thickness 5mm), an outer cylinder 2 (outer diameter 1.19m, thickness 10mm), an inner cylinder 3 (inner diameter 0.2m, thickness 10mm), an inner protective tube 4 (outer diameter 0.199m, thickness 5mm), a base 8 (thickness 20mm), and a water level pipe 9. The entire device is 1m high, with the outer sheath 1 divided into 10 rings, each 10cm high; the inner protective tube 4 has a total height of 1.2m. The outer cylinder 2, inner cylinder 3, and base 8 are made of lightweight, high-strength aluminum alloy, while the outer sheath 1 and inner protective tube 4 are made of acrylic sheet. The water level pipe 9 is made of transparent acrylic sheet material, with a scale marked on it. The outer cylinder 2 and inner cylinder 3 are welded and fixed to the base 8. The specific connection method is as follows: Figure 1 This is a top view of the device of the present invention. The outer sheath 1, outer cylinder 2, inner cylinder 3, and inner protective tube 4 are nested sequentially from the outside in. The outer sheath 1 is fitted to the outer cylinder 2, and the inner protective tube 4 is fitted to the inner cylinder 3. Figure 2 , Figure 7 , Figure 9 As shown, the inner protective tube 4 is engaged by the protruding guide groove on the inner side of the inner cylinder 3 and can slide along the inner cylinder 3 in its axial direction.
[0055] The outer cylinder 2 and the inner cylinder 3 are fixedly connected to the base 8; a cavity that can accommodate the test packing is formed between the outer cylinder 2 and the inner cylinder 3; both the outer cylinder 2 and the inner cylinder 3 are densely covered with drainage holes so that water or gas can flow out smoothly; the outer sheath 1 and the inner protective tube 4 can prevent water from flowing out;
[0056] like Figure 3 , Figure 4 As shown, the outer sheath 1 is detachably connected to the device, and the height of the outer sheath 1 can be adjusted according to the test height when testing the soil layer at different heights.
[0057] like Figure 3 As shown, the water level pipe 9 is detachably and sealed to the hole on the wall of the outer cylinder 2, so that the water level pipe 9 is connected to the water in the outer cylinder 2; the water level at the wall of the outer cylinder 2 can be read by the scale on the water level pipe; multiple water level pipes can be installed so that the average water level can be obtained.
[0058] like Figure 2 The height adjustment method of the outer sheath 1 is as follows: it includes multiple assemblable parts, and each assemblable part is provided with an outer sheath groove 101 and an outer sheath protrusion 102 at its upper and lower ends, respectively. A sealing ring is provided in the outer sheath groove 101 or on the outer sheath protrusion 102. The outer sheath protrusion 102 is inserted into another outer sheath groove 101 to compress the sealing ring. The multiple assemblable parts are interlocked to form the whole of the outer sheath 1. The bottom of the outer sheath 1 is connected to the base 8 in a plug-in manner with the sealing ring to form a sealed cylinder structure to prevent water from flowing out.
[0059] A groove is provided on the outer ring of the base 8, and a sealing ring is provided in the groove; the outer sleeve protrusion 102 at the bottom of the outer sleeve 1 is pressed into the groove of the base 8.
[0060] The water level pipe 9 is connected to the outer cylinder 2 by inserting the outer ring rubber into the hole on the wall of the outer cylinder 2, so that the water level pipe 9 and the water in the outer cylinder 2 are connected.
[0061] The above-mentioned device can be used to simulate and evaluate the weathering and clogging process of packing material.
[0062] Example 2
[0063] Using the apparatus of this invention, the weathering and clogging process of blind drain filler is simulated and evaluated through the following steps:
[0064] Step 1, as follows Figure 5 The state shown Figure 6 As shown, the blind drain filler, waste soil, and sand will be filled between the outer and inner cylinders sequentially from bottom to top, and compacted as required. The height of the blind drain filler is 0.6m, the height of the waste soil is 0.3m, and the height of the sand is 0.1m.
[0065] Step 2, as follows Figure 7 Insert the inner protective tube into the inner cylinder along the raised guide groove on the inner side of the inner cylinder, and insert it into the base to prevent water from flowing out of the inner cylinder.
[0066] Step 3, as follows Figure 7Using simulated rainfall equipment, water was sprayed onto the sandy surface for 10 hours. The sandy layer evenly distributed the rainwater, allowing it to infiltrate evenly into the waste soil and blind drain filler, before seeping out from around the outer cylinder. This simulated the process of rainwater infiltration into the filler and horizontal drainage of the blind drain in a natural waste disposal site. During the infiltration process, rainwater carried the waste soil into the pores of the blind drain filler, simulating the condition of the blind drain being blocked by the upper fine soil. Furthermore, due to the obstruction of the inner protective pipe, rainwater did not flow into the inner cylinder; water could only flow out through the outer cylinder.
[0067] Step 4, as follows Figure 8 After the rainfall stops, remove the inner protective pipe and use a blower to blow hot air into the inner cylinder, which then exits through the outer cylinder. Maintain the temperature at 60℃ and ventilate for 24 hours. The hot air heats the drain filler, accelerating its drying. Through the interaction of water and heat, the drain filler undergoes accelerated weathering. Because the inner cylinder penetrates the entire soil layer, the circulation of hot air ensures even aeration and heating throughout the soil.
[0068] Step 5: Repeat steps 2 to 4. One cycle can be considered as one rainy season, simulating the weathering and clogging process of the blind drain filler. After circulating water and air drying 5 times, that is, simulating 5 rainy seasons, stop the circulation.
[0069] Step 6, as follows Figure 9 After completing step 5, test the permeability coefficient of the soil layer in the middle of the blind drain filler, that is, the soil layer at a position 30cm-40cm from the bottom. Insert the inner protective pipe to a position 40cm from the bottom, install the outer protective sleeve to a position 30cm from the bottom, and insert the four water level pipes into the outer cylinder, installing them to a position 30cm from the bottom.
[0070] Step 7, as follows Figure 9 A servo water pump injects water into the inner protective pipe, maintaining the water level at the bottom of the inner protective pipe, approximately 40cm from the bottom. The water flows horizontally through the blind drain filler from the inner cylinder and finally exits from the outer cylinder.
[0071] The blocking effect of the inner protective pipe 4 allows water to flow out only through the inner cylinder 3 below the bottom of the pipe, preventing water from seeping into the soil layer above. This ensures that water can only seep into the soil layer to be tested, thus guaranteeing the water inflow surface position of the soil layer to be tested.
[0072] The outer sheath 1 prevents water from flowing out from below the bottom of the soil layer being tested, and only allows it to flow out through the soil layer being tested, thus ensuring the location of the water outflow surface in the soil layer being tested.
[0073] Step 8: After the water flow stabilizes, the water level at the outer cylinder wall is measured using water level pipes. The average value of the four water level pipes is recorded as h1 = 0.012 m; the height from the bottom of the inner protective pipe to the bottom of the soil layer to be measured is h0 = 0.1 m; the flow rate after stabilization is recorded by the servo pump as q = 6.5 m³ / d. Correction coefficient. The value is taken as 0.732, and the permeability coefficient of this soil layer is calculated using the following formula:
[0074]
[0075] In the formula: Permeability coefficient (m / d); This is a correction factor; Let be the flow rate (m³ / d); D be the inner diameter of the outer cylinder (m); and d be the outer diameter of the inner cylinder (m). Then the permeability coefficient can be calculated. It is 370 m / d.
[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A device for simulating the weathering and clogging process of blind drain filler, characterized in that, Includes the following structure: Outer sleeve 1, outer cylinder 2, inner cylinder 3, and inner protective tube 4 are nested from the outside to the inside. The outer sleeve 1 is fitted with the outer cylinder 2, and the inner protective tube 4 is fitted with the inner cylinder 3. The inner protective tube 4 is engaged by the protruding guide groove on the inner side of the inner cylinder 3 and can slide along the axial direction of the inner cylinder 3. The outer cylinder 2 and the inner cylinder 3 are fixedly connected to the base 8; a cavity that can accommodate the test packing is formed between the outer cylinder 2 and the inner cylinder 3; multiple holes are provided on both the outer cylinder 2 and the inner cylinder 3 to allow water or gas to flow out smoothly; the outer sheath 1 and the inner protective tube 4 can prevent water from flowing out. The outer sheath 1 is detachably connected to the device, and the height of the outer sheath 1 can be adjusted according to the test height when testing the soil layer at different heights. The water level pipe 9 is detachably and sealed to the hole on the wall of the outer cylinder 2, so that the water level pipe 9 and the water in the outer cylinder 2 are connected; the water level at the wall of the outer cylinder 2 can be read by the scale on the water level pipe; multiple water level pipes can be installed so that the average water level can be obtained.
2. The apparatus according to claim 1, characterized in that, The height adjustment method of the outer sheath 1 is as follows: it includes multiple assemblable parts, and each assemblable part is provided with an outer sheath groove 101 and an outer sheath protrusion 102 at its upper and lower ends, respectively. A sealing ring is provided in the outer sheath groove 101 or on the outer sheath protrusion 102. The outer sheath protrusion 102 is inserted into another outer sheath groove 101 to compress the sealing ring. The multiple assemblable parts are interlocked to form the whole of the outer sheath 1. The bottom of the outer sheath 1 is connected to the base 8 in a plug-in manner with the sealing ring to form a sealed cylinder structure to prevent water from flowing out.
3. The apparatus according to claim 1, characterized in that, The outer sheath 1, outer cylinder 2, inner cylinder 3, and inner protective tube 4 are made of acrylic sheet or lightweight high-strength aluminum alloy; the water level tube is transparent and visible, and is made of transparent acrylic sheet material.
4. The apparatus according to claim 1, characterized in that, The water level pipe 9 is connected to the outer cylinder 2 by inserting the outer ring rubber into the hole on the wall of the outer cylinder 2, so that the water level pipe 9 and the water in the outer cylinder 2 are connected.
5. A method for simulating and evaluating the weathering and clogging process of blind drain filler using the apparatus described in claim 1, characterized in that, Includes the following steps: Step 1: Install the outer cylinder 2 and inner cylinder 3 of the device. Fill the blind drain filler 7, waste soil 6, and sand 5 between the outer cylinder 2 and inner cylinder 3 from bottom to top, and compact them as required. Step 2: Insert the inner protective tube 4 into the inner cylinder 3 along the raised guide groove on the inner side of the inner cylinder 3, and insert it into the base to prevent water from flowing out of the inner cylinder; at this time, the outer protective sleeve 1 is not installed on the device. Step 3: Using a simulated rainfall device, water is sprayed onto the surface of sand 5; the sand layer evens out the rainwater, allowing it to infiltrate evenly into the waste soil and blind drain filler, and then seep out through the densely distributed holes on the surface of the outer cylinder 2, thus simulating the process of rainwater infiltration into the filler and horizontal drainage of the blind drain in a natural waste disposal site; during the rainwater infiltration process, the rainwater carries the waste soil into the pores of the blind drain filler, simulating the condition of the blind drain being blocked by the upper fine soil; In addition, due to the obstruction of the inner protective pipe, rainwater will not flow into the inner cylinder 3, and water can only flow out through the outer cylinder 2; Step 4: After the rainfall stops, remove the inner protective pipe 4 and use a blower to blow hot air into the inner cylinder 3. The air is blown out through the outer cylinder 2. The hot air can heat the blind drain filler and accelerate drying. Under the action of water and heat, the blind drain filler can achieve accelerated weathering. Since the inner cylinder 3 penetrates the entire soil layer, when hot air is passed through, the entire soil layer can be ventilated and heated. Step 5, repeating steps 2 to 4, can quickly simulate the weathering and clogging process of blind drain filler.
6. The method according to claim 5, characterized in that, It also includes steps 6-8: Step 6: After completing Step 5, insert the inner protective pipe 4 along the inner cylinder 3 until the bottom of the inner protective pipe 4 reaches the top of the soil layer where the permeability coefficient of the blind drain filler needs to be tested. Install the outer sheath 1 until the top of the outer sheath 1 reaches the bottom of the soil layer to be tested; Insert multiple water level pipes 9 into the holes on the surface of the outer cylinder 2. The installation height of the water level pipes 9 is the bottom height of the soil layer to be measured and the top of the outer sheath 1. Step 7: Water is injected into the inner protective pipe 4 by a servo water pump to keep the water level at the bottom of the inner protective pipe 4; the water flows horizontally from the inner cylinder 3 through the blind drain packing and finally flows out from the outer cylinder 2. The blocking effect of the inner protective pipe 4 allows water to flow out only through the inner cylinder 3 below the bottom of the pipe, preventing water from seeping into the soil layer above. This ensures that water can only seep into the soil layer to be tested, thus guaranteeing the water inflow surface position of the soil layer to be tested. The outer sheath 1 prevents water from flowing out from below the bottom of the soil layer being tested, and only allows it to flow out through the soil layer being tested, thus ensuring the location of the water outflow surface in the soil layer being tested. Step 8: After the water flow stabilizes, the water level height at the outer cylinder wall is obtained by measuring the water level through multiple water level pipes, and the average value of multiple water level pipes is recorded as h1; the height from the bottom of the inner protective pipe to the bottom of the soil layer to be tested is h0; the flow rate q after stabilization is recorded by the servo pump; then the permeability coefficient of the soil layer is calculated using the following formula: In the formula: Permeability coefficient (m / d); This is a correction factor; d is the flow rate (m³ / d); D is the inner diameter of the outer cylinder (m); d is the outer diameter of the inner cylinder (m).
7. The method according to claim 5, characterized in that, It also includes step 9: repeating steps 6 to 8 to achieve the measurement of the permeability coefficient at different depths of blind drain filler; and analyzing the impact of weathering and blockage on the drainage performance of blind drains by the change in permeability coefficient.
8. The application of the apparatus according to any one of claims 1-4 or the method according to any one of claims 5-7 in the simulation of weathering and clogging process of blind drain filler.