CN112198104A - Device and method for evaluating drainage performance of concealed pipe material - Google Patents
Device and method for evaluating drainage performance of concealed pipe material Download PDFInfo
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- CN112198104A CN112198104A CN202011063856.5A CN202011063856A CN112198104A CN 112198104 A CN112198104 A CN 112198104A CN 202011063856 A CN202011063856 A CN 202011063856A CN 112198104 A CN112198104 A CN 112198104A
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- 239000000463 material Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 146
- 239000004576 sand Substances 0.000 claims abstract description 63
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 6
- 238000011156 evaluation Methods 0.000 claims description 14
- 239000002689 soil Substances 0.000 claims description 9
- 238000011282 treatment Methods 0.000 claims description 8
- 238000009530 blood pressure measurement Methods 0.000 claims description 5
- 239000008400 supply water Substances 0.000 claims description 4
- 230000001965 increasing effect Effects 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 2
- 238000001595 flow curve Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000004904 shortening Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 4
- 238000010835 comparative analysis Methods 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
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- 238000004088 simulation Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 241001426407 Umbrina coroides Species 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a device and a method for evaluating drainage performance of a concealed conduit material, wherein the device comprises: the sand cylinder is provided with a concealed pipe and is used for simulating a seepage environment around the concealed pipe; the pressure measuring row is used for measuring the water head around the concealed pipe; the overflow box provides water flow and a stable water head for the seepage sand cylinder; the lifting platform is used for adjusting the height of the overflow box; and the water collecting tank is used for receiving the drainage of the concealed pipe and the overflow tank and recycling the drainage. The method comprises the following steps: filling connection, saturated exhaust, test measurement, ending sample change and analysis summary. The device has the advantages of simple structure, convenient operation, high accuracy, easy analysis of results and convenient comparative evaluation of various concealed conduit materials, thereby preferably selecting the concealed conduit material with better performance.
Description
Technical Field
The invention relates to the technical field of concealed conduit drainage, in particular to a device and a method for evaluating drainage performance of a concealed conduit material.
Background
Concealed pipe drainage is one of farmland drainage modes, concealed pipe materials and outer packing materials are collectively called as concealed pipe materials, at present, the commonly used pipes of the concealed pipes are plastic corrugated pipes, and the commonly used outer packing materials are geotextile. The plastic concealed pipe has different sizes, surface structures and open pore forms, and the outer coating has different thicknesses, pore distribution and permeability coefficients. In order to optimize the concealed pipe material to obtain better drainage effect, drainage performance evaluation needs to be carried out on different concealed pipe materials before the concealed pipe is applied. Common evaluation methods are: field test, sand tank test, numerical simulation, and the like.
The field test is more practical, but the actual test has large environmental variability, difficult control of test conditions, high cost, time and labor waste; the sand tank test can effectively evaluate the drainage performance of the concealed conduit material, but the device has too large size, is difficult to fill and implement, and is difficult to deal with the combination of various concealed conduit materials; numerical simulation is convenient and fast, but the drainage boundary is simpler, and different concealed conduit materials, especially the combination of the corrugated pipe and the non-woven fabric, cannot be effectively represented.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a test apparatus and a method for evaluating drainage performance of a concealed conduit material, which can quickly and accurately compare and evaluate drainage performance of a plurality of different concealed conduit materials.
In order to achieve the purpose, the scheme of the invention is as follows:
in a first aspect, the present invention provides a device for evaluating drainage performance of a concealed conduit material, comprising: comprises a sand cylinder, a pressure measuring row, an overflow box, a lifting platform and a water collecting box;
the sand cylinder is filled with soil and is provided with a concealed pipe for simulating a seepage environment around the concealed pipe;
the pressure measuring row is connected with the sand cylinder and used for measuring a section water head of the sand cylinder;
the overflow box is connected with the sand cylinder and provides water flow and a stable water head for the sand cylinder;
the top end of the lifting platform is provided with an overflow box to adjust the height of the overflow box, and the overflow box is used for adjusting a water supply head of the overflow box;
the water collecting tank is connected with the overflow tank to receive the drainage of the concealed pipe and the overflow tank and circularly supply the drainage to the overflow tank.
As a preferred scheme, the sand cylinder consists of four parts, including an inner cylinder, an outer cylinder, a front panel and a rear panel; the outer cylinder is used for concentrically sleeving the inner cylinder to form a sleeve, one end of the sleeve is hermetically bonded with the front panel, and the other end of the sleeve is connected with the rear panel through a flange; the rear panel has the same appearance size as the front panel and is connected with the outer cylinder through a flange; rubber rings are arranged in the flanges for sealing and stopping water;
also comprises four water delivery pipes; the overflow box is a rectangular groove body, and a vertical baffle plate with the height lower than that of the groove body is arranged in the groove body; the baffle divides the tank body into two parts, one part is an inlet water overflow end, and the other part is a residual water discharge end; the water inlet overflow end is provided with a water inlet hole and two water outlet holes; the two water outlet holes are respectively connected with the sand cylinder through two water conveying pipes; the residual water removing end is provided with a drain hole, and the drain hole is connected with the water collecting tank through a water conveying pipe;
a water pump is arranged in the water collecting tank; the water pump is connected with the water inlet through a water delivery pipe and supplies water in the water collection tank to the overflow tank.
Furthermore, the inner cylinder is a cylindrical shell with a pipe wall uniformly drilled with round holes, and a layer of filter screen is arranged on the inner wall of the inner cylinder; the outer cylinder is a cylindrical shell with the same length as the inner cylinder, and the diameter of the outer cylinder is larger than that of the inner cylinder; two water supply holes are formed in the outer barrel and are positioned at two end points of the cross section diameter of the outer barrel; the outer cylinder is also provided with an exhaust hole and a drain hole which can be used for pressure measurement, the exhaust hole and the drain hole are positioned at two end points of the other diameter of the cross section of the outer cylinder, and the diameter of the cross section of the outer cylinder and the other diameter of the cross section are arranged in a 90-degree crossed manner; and the outer wall of the outer barrel is pasted with scale paper to control the soil filling precision.
Furthermore, the front panel is a circular panel, and the diameter of the circular panel is larger than that of the outer barrel; the center of the front panel is provided with a hidden tube hole for placing a hidden tube; the diameter of the hidden pipe hole is the same as the outer diameter of the hidden pipe; the front panel is also provided with a plurality of pressure measuring holes, and the pressure measuring holes are annularly distributed in a shape of Chinese character 'mi' with the circle center of the front panel as the center.
Further, the bottom ends of the front and rear panels are each flattened by a section to allow the evaluation device to be placed smoothly.
In a second aspect, the present invention provides a method for evaluating drainage performance of a concealed conduit material, comprising: the drainage performance evaluation device for the concealed pipe material comprises the following steps:
(1) filling and connecting: opening a back panel of the sand cylinder, installing the concealed pipe at the position of the concealed pipe hole, horizontally placing the sand cylinder downwards, then uniformly filling sand in layers, determining the filling density according to the used sand according to the principle that the sand is easy to compact and does not sink, closing the back panel after filling the sand, then righting the sand cylinder, finally connecting the sand cylinder with a pressure measuring row and an overflow tank, and connecting the overflow tank with a water collecting tank;
(2) saturated exhaust: opening an exhaust hole of the sand cylinder, stably and slowly supplying water to the sand cylinder through a water supply hole by using a water pump, gradually and slowly increasing the flow of the water pump after the concealed pipe starts to drain water to enable the water level in the sand cylinder to rise until the sand cylinder is completely saturated, then plugging the exhaust hole, closing the water pump, standing the sand cylinder for 24 hours, then opening the water pump again to supply water, connecting the exhaust hole to the pressure measuring pipes, and exhausting the air of all the pressure measuring pipes;
(3) test measurement: after the height of the overflow box is fixed, measuring the flow of the concealed pipe once every 3-6h, shortening the measurement interval after the flow of the concealed pipe tends to be stable, measuring once every 1h until the flow is stable, wherein the measured flow is free from the influence caused by temperature fluctuation, then recording the stable flow and the section water head, controlling the lifting platform bar to adjust the heights of different overflow boxes, and recording the flow of the concealed pipe and the section water head under different water heads;
(4) ending and changing samples: after one concealed conduit material is treated, water in the device is drained through a drain hole, the connection between all parts of the device is disconnected, sandy soil in a sand cylinder is cleaned, the concealed conduit material is replaced after the device is cleaned, and the next test is carried out again according to the steps (1) to (3) until all test treatments are finished;
(5) and (3) analysis and summary: drawing water head flow curves of different treatments, and judging the drainage performance of different concealed pipe materials according to the positions of the curves; and further drawing a profile water head contour map of the sand cylinder to analyze the flow field.
The invention has the following advantages and beneficial effects:
the device and the method for evaluating the drainage performance of the concealed pipe material simulate the actual seepage environment around the concealed pipe, and can obtain the drainage flow of different concealed pipe materials by adjusting different water supply heads, so that the concealed pipe material with better drainage performance is obtained, and a basis is provided for the design and selection of the concealed pipe material. The device is light and convenient, is simple to operate, can test a large amount of concealed pipe materials which are treated differently, has strong contrast between tests, has accurate results and is easy to analyze, and has certain value in the aspects of design and application of concealed pipe drainage.
Drawings
FIG. 1 is a front view of a device for evaluating drainage performance of a concealed conduit material according to an embodiment of the present invention;
FIG. 2 is a side view of a sand cylinder according to an embodiment of the present invention;
fig. 3 is a water head flow scatter diagram according to an embodiment of the present invention;
FIG. 4 is a first contour plot of a seepage cross-sectional waterhead according to an embodiment of the present invention;
fig. 5 is a contour diagram of a seepage cross-section head according to an embodiment of the present invention.
In the figure: the device comprises a concealed pipe 0, a sand cylinder 1, an inner cylinder 11, an outer cylinder 12, a front panel 13, a rear panel 14, a water supply hole 15, an exhaust hole 16, a drain hole 17, a concealed pipe hole 18 and a pressure measuring hole 19; a pressure measuring bar 2; the overflow box 3, a water inlet hole 31, a water outlet hole 32 and a water outlet hole 33; a lifting table 4; a water collection tank 5, a water pump 51; a water delivery pipe 6.
Detailed Description
The following describes in detail specific embodiments of the apparatus and method for evaluating drainage performance of concealed conduit materials according to the present invention with reference to the drawings.
As shown in fig. 1, the apparatus for evaluating the drainage performance of the concealed pipe material provided in this embodiment includes: sand section of thick bamboo 1, pressure measurement row 2, overflow tank 3, elevating platform 4, header tank 5.
As shown in fig. 1-2, the sand cylinder 1 is composed of an inner cylinder 11, an outer cylinder 12, a front panel 13 and a rear panel 14, two water supply holes 15 are arranged at the left and right ends of the outer cylinder 12, an exhaust hole 16 is arranged at the upper end, a drain hole 17 is arranged at the lower end, a hidden pipe hole 18 and a pressure measuring hole 19 are arranged on the front panel 13, and a hidden pipe 0 is placed in the hidden pipe hole 18.
As shown in fig. 1, the overflow tank 3 is provided with a water inlet 31, a water outlet 32, and a water outlet 33. The water collection tank 5 is placed right under the sand drum 1, and the water pump 51 is placed in the water collection tank 5. All parts of the device are connected through a water conveying pipe 6.
The above is a specific structure of the device for evaluating the drainage performance of the concealed pipe material provided in this embodiment, and the following describes a method for evaluating the drainage performance of the concealed pipe material based on the device, including the following steps:
step (1): the back panel 14 of the sand cylinder 1 is opened, the concealed pipe 0 is wrapped with the outer wrapping material and then is arranged in the concealed pipe hole 18 in the middle of the front panel 13 and is sealed by glue. The sand cylinder 1 is horizontally placed downwards, soil is filled in layers according to the obtained density, the rear panel 14 is closed after the soil is filled, and finally the sand cylinder 1 is erected. The pressure measuring row 2 is connected with a pressure measuring hole 19 on a front panel 13 of the sand cylinder 1, a water delivery pipe 6 is used for connecting a water outlet 32 on the overflow tank 3 with a water supply hole 15 on the outer cylinder 12, the water delivery pipe 6 is used for connecting a water inlet 31 on the overflow tank 3 with a water pump 51, and the water delivery pipe 6 is used for connecting a water outlet 33 on the overflow tank 3 with a water collecting tank 5.
Step (2): the air vent 16 is opened, the water collecting tank 5 is filled with water, the water pump 51 is opened, and the flow rate of the water pump 51 is adjusted, so that the water flows into the sand cylinder 1 at a small enough flow rate. After the hidden pipe 0 begins to drain, the flow of the water pump 51 is gradually increased, so that the water supply flow is always slightly larger than the hidden pipe drainage flow until the whole sand cylinder 1 is saturated, and then the exhaust hole 16 is blocked. And (3) turning off the water pump 51, standing the sand cylinder 1 for 24h, turning on the water pump 51 again, opening the exhaust hole 16 to drain overflowed gas, connecting the exhaust hole 16 to the pressure measurement row 2, and finally discharging the gas in the pressure measurement row 2.
And (3): controlling the lifting platform 4 to adjust the overflow tank 3 to a set height, then measuring and recording the flow of the concealed pipe every 6h, changing the measurement to be carried out every 1h after the flow of the concealed pipe tends to be stable until the flow is stable, recording the stable flow and the water temperature at the time, reading the pressure measuring pipe water heads of the pressure measuring holes 19 and the exhaust holes 16, then controlling the lifting platform 4 to change the height of the overflow tank 3 again, reading the flow of the concealed pipe and the pressure measuring pipe water heads under different water supply water heads, changing the water heads for measurement at least five times, wherein the water head range covers high, medium and low water heads.
And (4): after one concealed conduit material is processed, the water pump 51 is stopped, the drain hole 17 is opened to drain gravity water in the device, the connection among all parts of the device is disconnected, the rear panel 14 is opened, the filled soil in the sand cylinder 1 is dug out, the concealed conduit 0 is taken down, the device is cleaned, the concealed conduit material is replaced, and the next processing test is carried out again according to the sequence of the step 1, the step 2 and the step 3 until all processing tests are completed.
And (5): and uniformly correcting the measured flow of the concealed pipe to be 20 ℃ according to the recorded water temperature. The flow of the concealed conduit after temperature correction and the water head between the outer cylinder 12 and the inner cylinder 11 measured at the exhaust hole 16 are drawn into a scatter diagram, linear fitting is carried out on the scatter diagram, the drainage performance of the concealed conduit material can be judged according to the relative position between fitted lines, as shown in figure 3, the flow of the treatment 5 under the same water supply water head is larger than that of the treatment 1, and the drainage performance of the concealed conduit material represented by the treatment 5 is superior to that of the treatment 1. The contour map of the water head of the section of the sand cylinder 1 is drawn according to the measured water head values of the pressure measuring pipes at different positions, as shown in figures 4-5, the two figures are respectively the distribution conditions of the water head of the section processed by different underground pipe materials under the same water head, the water head of the section shown in figure 4 is uniformly distributed, the change of the water head around the underground pipe is smooth, the water flow uniformly enters the underground pipe from the periphery, the large water head loss does not exist along the process, the drainage performance of the underground pipe is good, the water head of the section shown in figure 5 is not uniformly distributed, the water head change around the underground pipe, particularly under the underground pipe, is severe, the water flow mostly enters the underground pipe from the lower part of the underground pipe, the large water head loss exists at the inlet of.
The above embodiments are merely illustrative of the technical solutions of the present invention. The device and method for evaluating the drainage performance of the concealed pipe material according to the present invention are not limited to the contents described in the above embodiments, but are subject to the scope defined by the claims. Any modification or supplement or equivalent replacement made by a person skilled in the art on the basis of this embodiment is within the scope of the invention as claimed in the claims.
Claims (7)
1. The utility model provides a hidden pipe material drainage performance evaluation device which characterized in that: comprises a sand cylinder (1), a pressure measuring row (2), an overflow box (3), a lifting platform (4) and a water collecting box (5);
the sand cylinder (1) is filled with soil and is provided with a concealed pipe (0) for simulating a seepage environment around the concealed pipe (0);
the pressure measuring row (2) is connected with the sand cylinder (1) and is used for measuring the section water head of the sand cylinder (1);
the overflow box (3) is connected with the sand cylinder (1) and provides water flow and a stable water head for the sand cylinder (1);
the top end of the lifting platform (4) is provided with an overflow box (3) so as to adjust the height of the overflow box (3) and adjust a water supply head of the overflow box (3);
the water collecting tank (5) is connected with the overflow tank (3) to receive the drainage of the concealed pipe (0) and the overflow tank (3) and circularly supply the drainage to the overflow tank (3).
2. The concealed pipe material drainage performance evaluation device according to claim 1, wherein:
the sand cylinder (1) consists of four parts, including an inner cylinder (11), an outer cylinder (12), a front panel (13) and a rear panel (14); the inner cylinder (11) is concentrically sleeved in the outer cylinder (12) to form a sleeve, one end of the sleeve is hermetically bonded with the front panel (13), and the other end of the sleeve is connected with the rear panel (14) through a flange; the outer dimension of the rear panel (14) is the same as that of the front panel (13), and the rear panel is connected with the outer cylinder (12) through a flange; rubber rings are arranged in the flanges for sealing and stopping water;
also comprises four water conveying pipes (6); the overflow box (3) is a rectangular groove body, and a vertical baffle plate with the height lower than that of the groove body is arranged in the groove body; the baffle divides the tank body into two parts, one part is an inlet water overflow end, and the other part is a residual water discharge end; the water inlet overflow end is provided with a water inlet hole (31) and two water outlet holes (32); the two water outlets (32) are respectively connected with the sand cylinder (1) through two water conveying pipes (6); the residual water removing end is provided with a drain hole (33), and the drain hole (33) is connected with the water collecting tank (5) through a water conveying pipe (6);
a water pump (51) is arranged in the water collecting tank (5); the water pump (51) is connected with the water inlet hole (31) through a water delivery pipe (6) and supplies water in the water collecting tank (5) to the overflow tank (3).
3. The concealed pipe material drainage performance evaluation device according to claim 2, characterized in that: the inner cylinder (11) is a cylindrical shell with a pipe wall uniformly drilled with round holes, and a layer of filter screen is arranged on the inner wall of the inner cylinder (11); the outer cylinder (12) is a cylindrical shell with the same length as the inner cylinder (11), and the diameter of the outer cylinder (12) is larger than that of the inner cylinder (11); two water supply holes (15) are formed in the outer cylinder (12), and the two water supply holes (15) are located at two end points of the cross section diameter of the outer cylinder (12); the outer cylinder (12) is also provided with an exhaust hole (16) and a drain hole (17) which can be used for pressure measurement, the exhaust hole (16) and the drain hole (17) are positioned at two end points of the other diameter of the cross section of the outer cylinder (12), and the diameter of the cross section of the outer cylinder (12) and the other diameter of the cross section are arranged in a 90-degree crossed manner; and the outer wall of the outer cylinder (12) is pasted with scale paper to control the soil filling precision.
4. The concealed pipe material drainage performance evaluation device according to claim 2 or 3, characterized in that: the front panel (13) is a circular panel, and the diameter of the front panel is larger than that of the outer cylinder (12); the center of the front panel (13) is provided with a hidden tube hole (18) for placing a hidden tube (0); the diameter of the hidden pipe hole (18) is the same as the outer diameter of the hidden pipe (0); the front panel (13) is also provided with a plurality of pressure measuring holes (19), and the pressure measuring holes (19) are annularly distributed in a shape of Chinese character 'mi' with the center of a circle of the front panel (13) as the center.
5. The concealed pipe material drainage performance evaluation device according to claim 2 or 3, characterized in that: the bottom ends of the front panel (13) and the rear panel (14) are flattened to enable the evaluation device to be placed stably.
6. The concealed pipe material drainage performance evaluation device according to claim 4, wherein: the bottom ends of the front panel (13) and the rear panel (14) are flattened to enable the evaluation device to be placed stably.
7. A method for evaluating the drainage performance of a concealed pipe material is characterized by comprising the following steps: the drainage performance evaluation is carried out by using the concealed pipe material drainage performance evaluation device of any one of claims 1 to 6, and comprises the following steps:
(1) filling and connecting: opening a back panel of the sand cylinder, installing the concealed pipe at the position of the concealed pipe hole, horizontally placing the sand cylinder downwards, then uniformly filling sand in layers, determining the filling density according to the used sand according to the principle that the sand is easy to compact and does not sink, closing the back panel after filling the sand, then righting the sand cylinder, finally connecting the sand cylinder with a pressure measuring row and an overflow tank, and connecting the overflow tank with a water collecting tank;
(2) saturated exhaust: opening an exhaust hole of the sand cylinder, stably and slowly supplying water to the sand cylinder through a water supply hole by using a water pump, gradually and slowly increasing the flow of the water pump after the concealed pipe starts to drain water to enable the water level in the sand cylinder to rise until the sand cylinder is completely saturated, then plugging the exhaust hole, closing the water pump, standing the sand cylinder for 24 hours, then opening the water pump again to supply water, connecting the exhaust hole to the pressure measuring pipes, and exhausting the air of all the pressure measuring pipes;
(3) test measurement: after the height of the overflow box is fixed, measuring the flow of the concealed pipe once every 3-6h, shortening the measurement interval after the flow of the concealed pipe tends to be stable, measuring once every 1h until the flow is stable, wherein the measured flow is free from the influence caused by temperature fluctuation, then recording the stable flow and the section water head, controlling the lifting platform bar to adjust the heights of different overflow boxes, and recording the flow of the concealed pipe and the section water head under different water heads;
(4) ending and changing samples: after one concealed conduit material is treated, water in the device is drained through a drain hole, the connection between all parts of the device is disconnected, sandy soil in a sand cylinder is cleaned, the concealed conduit material is replaced after the device is cleaned, and the next test is carried out again according to the steps (1) to (3) until all test treatments are finished;
(5) and (3) analysis and summary: drawing water head flow curves of different treatments, and judging the drainage performance of different concealed pipe materials according to the positions of the curves; and further drawing a profile water head contour map of the sand cylinder to analyze the flow field.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011063856.5A CN112198104B (en) | 2020-09-30 | 2020-09-30 | Device and method for evaluating drainage performance of concealed pipe material |
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| CN202011063856.5A CN112198104B (en) | 2020-09-30 | 2020-09-30 | Device and method for evaluating drainage performance of concealed pipe material |
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| CN112198104B CN112198104B (en) | 2022-02-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466107A (en) * | 2021-07-09 | 2021-10-01 | 东华理工大学 | Water permeability sleeve for indoor test and manufacturing method thereof |
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| CN101110175A (en) * | 2007-08-28 | 2008-01-23 | 成都理工大学 | Geological environment simulating experiment device |
| US20120000841A1 (en) * | 2007-10-17 | 2012-01-05 | Caterpillar Inc. | Canister filter system with drain that cooperates with filter element |
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| CN112198104B (en) | 2022-02-01 |
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