CN110940625A - Device and method for simulating permeable concrete blocking mechanism under real rainfall condition - Google Patents
Device and method for simulating permeable concrete blocking mechanism under real rainfall condition Download PDFInfo
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 27
- 239000004567 concrete Substances 0.000 title claims abstract description 27
- 230000007246 mechanism Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 241
- 238000012360 testing method Methods 0.000 claims abstract description 51
- 239000011521 glass Substances 0.000 claims abstract description 49
- 230000005484 gravity Effects 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 9
- 239000007921 spray Substances 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 239000011380 pervious concrete Substances 0.000 claims description 54
- 239000002245 particle Substances 0.000 claims description 33
- 238000002360 preparation method Methods 0.000 claims description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 20
- 230000008859 change Effects 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 239000011780 sodium chloride Substances 0.000 claims description 10
- 229920001971 elastomer Polymers 0.000 claims description 9
- 238000004088 simulation Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 229940099259 vaseline Drugs 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000009991 scouring Methods 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 abstract description 2
- 238000005406 washing Methods 0.000 abstract 1
- 230000035699 permeability Effects 0.000 description 13
- 238000011160 research Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 230000036619 pore blockages Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
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- 238000004364 calculation method Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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 simulating a permeable concrete blocking mechanism under a real rainfall condition, wherein the device comprises an organic glass sleeve, a drain pipe, a water valve, a water pressure sensor, a gravity sensor, a current sensor, a spray header, a propeller and other components, and data are collected by the water pressure sensor, the gravity sensor and the current sensor and are transmitted to a data processing system for analysis. The device simulates real rainfall through the spray header, the propeller drives the water flow to flow horizontally to simulate surface horizontal runoff, the test piece is of a multilayer structure consisting of a permeable concrete layer, a cushion layer and a base layer, and then the blocking process of the permeable concrete pavement under rainfall and surface runoff washing under the real rainfall condition is simulated, and the permeable concrete pore blocking mechanism is disclosed.
Description
Technical Field
The invention relates to a device and a method for simulating a permeable concrete blocking mechanism under a real rainfall condition, solves the technical defects that the permeability coefficient of a multilayer permeable concrete pavement cannot be measured and the permeable concrete blocking mechanism cannot be simulated in the prior art, and belongs to the field of traffic transportation.
Background
The pervious concrete is porous light concrete formed by coating a layer of cement slurry on the surface of coarse aggregate and bonding, and has the advantages of good air permeability and water permeability, light weight and the like. The pervious concrete can make rainwater flow into the ground, so that the underground water level rises, the problems of ground settlement, urban waterlogging and the like are solved, and the pervious concrete is a novel ecological paving material which can effectively reduce environmental pollution, reduce noise and relieve the urban heat island effect. It is beneficial to the drainage of urban pavements and the prevention and control of water pollution, and has good economic and social benefits. At present, a lot of pervious concrete is popularized and used in many countries in the world as a paving material of urban roads, but along with the increase of service time, gaps of the pervious concrete are easy to be blocked to a great extent, so that the drainage performance of the pervious concrete is greatly reduced. The existing research shows that the actual service life of the pervious concrete is short in arm design value, and pore blockage is the largest factor influencing the service life of the pervious concrete, so that the research on the pore blockage mechanism of the pervious concrete is the leading topic in the field.
The existing various technologies for measuring the permeability of pervious concrete are commonly used for qualitatively reflecting the degree of internal pore blockage by testing the permeability coefficient of a concrete test piece, and the method can only obtain the change of permeability within a period of time, but does not research the content of particles retained in the pervious concrete and the vertical distribution rule of the particles in a complete process. In the past, when the permeability coefficient is tested by adopting a normal water head method, the permeability coefficient is mostly calculated by measuring the flow within a certain time, but due to the error of manual operation, the accuracy of the result is influenced. And previous studies lack simulation of the real environment due to the fact that most tests are conducted indoors, and indoor test results may be greatly different from field surveys. Therefore, the existing methods cannot realize real-time monitoring on the permeability performance of the pervious concrete and research on the retention efficiency of pollutants. Therefore, in order to further research the change rule of the permeability of the pervious concrete along with the migration of the particles, simulate the whole process of the internal pore blocking of the concrete and reveal the microscopic mechanism of the pore blocking, a novel device for measuring a permeable concrete pavement permeability system and simulating the blocking mechanism is developed.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a device and a method for simulating a permeable concrete blocking mechanism under the real rainfall condition.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a device for simulating a permeable concrete blocking mechanism under a real rainfall condition comprises an organic glass sleeve, wherein the upper end of the organic glass sleeve is open, and the side wall of the upper end of the organic glass sleeve is provided with an overflow port; placing a test piece in an organic glass sleeve, wherein the test piece comprises a permeable concrete layer, a cushion layer and a base layer which are sequentially stacked from top to bottom; an upper iron wire mesh is arranged on the upper surface of the pervious concrete layer, a lower iron wire mesh is arranged on the lower surface of the base layer, and a power supply and a current sensor are connected between the upper iron wire mesh and the lower iron wire mesh;
four water pressure sensors are arranged on one side of the organic glass sleeve from top to bottom, wherein the four water pressure sensors are respectively a first water pressure sensor, a second water pressure sensor, a third water pressure sensor and a fourth water pressure sensor; the first water pressure sensor is positioned on the upper side of the pervious concrete layer, the second water pressure sensor is positioned between the pervious concrete layer and the cushion layer, the third water pressure sensor is positioned between the cushion layer and the base layer, and the fourth water pressure sensor is positioned on the lower side of the base layer;
the other side of the organic glass sleeve is provided with four water outlets from top to bottom, the water outlets are respectively connected with drain pipes, and a first water valve, a second water valve, a third water valve and a fourth water valve are respectively arranged on the four drain pipes from top to bottom; the first water valve is positioned at the lower side of the permeable concrete layer, the second water valve is positioned at the lower side of the cushion layer, the third water valve is positioned at the lower side of the base layer, and the fourth water valve is positioned at the bottom of the organic glass sleeve; a drain pipe corresponding to the fourth water valve is connected with a water collecting tank, and a gravity sensor is placed at the bottom of the water collecting tank; the drain pipes corresponding to the first water valve, the second water valve and the third water valve are respectively connected with a water collecting cup;
the utility model discloses a rain water treatment device, including organic glass sleeve, water sample preparation case, water pump, shower head, mixer and screw, organic glass sleeve left side is equipped with the rainfall simulation device, the rainfall simulation device includes water sample preparation case, water pump, shower head, mixer and screw, water sample preparation case is placed in organic glass sleeve left side, and the mixer setting is in water sample preparation incasement, through water pump and water piping connection between water sample preparation case and the shower head, and the shower head is located organic glass sleeve's top, and the screw is arranged in organic glass sleeve to be located.
Furthermore, the organic glass sleeve is of a three-layer detachable structure and is divided into an upper layer, a middle layer and a lower layer, and the two adjacent layers are connected through a spiral bayonet; the outside of the joint of the upper layer and the middle layer is wrapped by rubber and then hooped by a hose clamp, and the joint of the middle layer and the lower layer is fastened by a fixing bolt.
Furthermore, vaseline is smeared on the side wall of the pervious concrete layer, and a flexible rubber pad is sleeved on the side wall of the pervious concrete layer.
Further, the pervious concrete layer is 80mm in thickness, the cushion layer is 30mm in thickness, and the base layer is 500mm in thickness.
Further, the cushion layer is a gravel cushion layer, and the particle size distribution is 2-6 mm; the base course is the gravel base course, and the particle size distribution is 4~25 mm.
Further, the overflow gaps comprise three overflow gaps with different heights, and the distance between every two adjacent overflow gaps is 10 cm.
Furthermore, a filter screen is arranged at the water outlet of the drain pipe corresponding to the fourth water valve.
Furthermore, the current sensor, the first to fourth water pressure sensors and the gravity sensor are connected with a data processing system through data lines, and the data processing system is connected with a PC terminal.
A method for simulating a permeable concrete blocking mechanism under a real rainfall condition is carried out by utilizing the device, and comprises the following specific steps:
(a) placing a test piece comprising a pervious concrete layer, a cushion layer and a base layer into a NaCl solution with the concentration of 10% to be soaked for 24 hours to enable the test piece to reach a saturated state; then coating vaseline on the side wall of the pervious concrete layer, sleeving a flexible rubber pad on the side wall, and putting the three-layer test piece into an organic glass sleeve;
(b) adding tap water into a water sample preparation box, adding a certain amount of silt mixed particles into a water body, doping NaCl, regulating the NaCl concentration of the water sample to be 10%, and starting a stirrer positioned in the water sample preparation box to uniformly distribute the silt mixed particles in the water sample;
(c) starting a water pump, conveying a water sample in a water sample preparation box into an organic glass sleeve through a spray head, driving a water flow to flow horizontally by a propeller above a test specimen, simulating the scouring action of horizontal runoff, and simulating the horizontal runoff with different strengths by controlling the rotating speed of the propeller;
(d) opening a fourth water valve, enabling a water sample to pass through the three layers of test pieces to flow to the bottom of the organic glass sleeve under the action of osmosis, measuring the water head difference value of the upper side and the lower side of each layer of test piece through the first water pressure sensor, the second water pressure sensor, the third water pressure sensor and the fourth water pressure sensor, collecting the effluent water sample through the water collecting tank, measuring the weight change of the effluent water sample through a gravity sensor at the bottom of the water collecting tank, and calculating the change condition of the osmosis of the test piece; calculating the resistivity through the power supply voltage and the current sensor value, and acquiring the change of the corresponding water flow velocity through the change condition of the resistivity;
(e) in the experimental process, the first water valve, the second water valve and the third water valve are opened every 2min to collect water samples at different time and different position heights, the collected water samples are processed and analyzed, the distribution conditions of the blocking particles along with time and radial height are obtained, and the influence effect of the blocking particles with specific particle sizes on various permeable pavement structure layers is obtained.
Has the advantages that: the device provided by the invention sets the research object as a test piece of a three-layer structure of the pervious concrete layer, the cushion layer and the base layer, is closer to the structure layer of the pervious concrete pavement in the actual engineering, and can better reflect the blocking effect of the pervious concrete in the actual engineering; water intakes are respectively arranged on the permeable concrete layer, the cushion layer and the lower side of the base layer of the test piece, water samples flowing through each structural layer are taken out, and the influence effect of blocking particles with different particle sizes on different layers is analyzed; the real rainwater components can be simulated by adding agricultural soil, organic matters and blocking particles with different particle sizes into the water sample in the water sample preparation box, so that the analysis structure is closer to the blockage effect of pervious concrete under the real rainfall condition; the gravity sensor is arranged at the bottom of the water collecting tank connected with the water drainage pipe corresponding to the fourth water valve, the water flow velocity is calculated through the change of the weight of the water sample flowing out along with the time in the test process, the test result is more accurate, and the effect is better.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic diagram of the connection of the device and test sensors of the present invention.
In the figure, 1, a first water valve, 2, a second water valve, 3, a third water valve, 4, a fourth water valve, 5, a first water pressure sensor, 6, a second water pressure sensor, 7, a third water pressure sensor, 8, a fourth water pressure sensor, 9, an upper iron wire mesh, 10, a lower iron wire mesh, 11, an overflow port, 12, a power supply, 13, a current sensor, 14, a data processing system, 15, a gravity sensor, 16, a filter screen, 17, a fixing bolt, 18, a water pump, 19, a spray head, 20, a propeller, 21, an organic glass sleeve, 22, a stirrer, 23, a hose clamp, 24, a permeable concrete layer, 25, a cushion layer, 26, a base layer, 27, a water collecting tank and 28, a water sample preparation tank are arranged.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 and 2, the device for simulating the permeable concrete blocking mechanism under the real rainfall condition comprises an organic glass sleeve 21, wherein the upper end of the organic glass sleeve 21 is open and used for water inflow, and a water overflow port 11 is arranged on the side wall of the upper end of the sleeve.
The organic glass sleeve 21 is of a three-layer detachable structure and is divided into an upper layer, a middle layer and a lower layer, and the two adjacent layers are connected through a spiral bayonet; the outside of the joint of the upper layer and the middle layer is wrapped by rubber and is hooped by a hose clamp 23, so that the side wall is prevented from leaking water; the joint of the middle layer and the lower layer is fastened by a fixing bolt 17. The plexiglass sleeve 21 has an internal diameter of 110 mm.
Placing a test piece in an organic glass sleeve 21, wherein the test piece comprises a pervious concrete layer 24, a cushion layer 25 and a base layer 26 which are sequentially stacked from top to bottom, and the thickness of the pervious concrete layer 24 is 80 mm; the cushion layer 25 is a gravel cushion layer, the particle size distribution is 2-6 mm, and the thickness is 30 mm; the base layer 26 is a gravel base layer, the particle size distribution is 4-25 mm, and the thickness is 500 mm. Vaseline is smeared on the side wall of the pervious concrete layer 24, and a flexible rubber pad is sleeved on the side wall to prevent the side wall from permeating; the three layers of test pieces are placed in the organic glass sleeve 21 in sequence. 24 upper surfaces of concrete layer that permeates water are provided with wire netting 9, and the basic unit lower surface is provided with down wire netting 10, goes up wire netting 9 and inserts power 12 and current sensor 13 down between the wire netting 10, forms closed circuit.
The overflow gaps 11 comprise three overflow gaps with different heights, the interval between every two adjacent overflow gaps is 10cm, and the distance between the lowest overflow gap 11 and the pervious concrete layer 24 is 10 cm; different runoff depths on the road surface under the actual rainfall condition are simulated by arranging overflow ports with different heights.
Four water pressure sensors, namely a first water pressure sensor 5, a second water pressure sensor 6, a third water pressure sensor 7 and a fourth water pressure sensor 8, are arranged on one side of the organic glass sleeve 21 from top to bottom; the first water pressure sensor 5 is positioned on the upper side of the pervious concrete layer 24, the second water pressure sensor 6 is positioned between the pervious concrete layer 24 and the cushion layer 25, the third water pressure sensor 7 is positioned between the cushion layer 25 and the base layer 26, and the fourth water pressure sensor 8 is positioned on the lower side of the base layer 26. And measuring the water head difference value of the upper side and the lower side of each layer of test piece through a water pressure sensor.
The other side of the organic glass sleeve 21 is provided with four water outlets from top to bottom, each water outlet is connected with a drain pipe, and a first water valve 1, a second water valve 2, a third water valve 3 and a fourth water valve 4 are arranged on the four drain pipes from top to bottom; the first water valve 1 is located the 24 downside of pervious concrete layer, and the second water valve 2 is located the bed course 25 downside, and third water valve 3 is located basic unit 26 downside, and fourth water valve 4 is located organic glass sleeve 21's bottom. A filter screen 16 is arranged at the water outlet of the drain pipe corresponding to the fourth water valve 4 and then is connected to a water collecting tank 27, a gravity sensor 15 is arranged at the bottom of the water collecting tank 27, an effluent water sample is collected through the water collecting tank 27, and the weight change of the effluent water sample is measured through the bottom gravity sensor 15; and the drain pipes corresponding to the first water valve 1, the second water valve 2 and the third water valve 3 are respectively connected with a water collecting cup, so that water samples at different time and different position heights are collected, and the collected water samples are processed and analyzed.
The current sensor 13, the first to fourth water pressure sensors and the gravity sensor 15 are connected with a data processing system 14 through data lines, and the data processing system 14 is connected with a PC terminal.
The left side of the organic glass sleeve is provided with a rainfall simulation device, the rainfall simulation device comprises a water sample preparation box 28, a water pump 18, a spray header 19, a stirrer 22 and a propeller 20, the sample preparation box 28 is arranged on the left side of the organic glass sleeve 21, the stirrer 22 is arranged in the water sample preparation box 28, the water sample preparation box 28 is connected with the spray header 19 through the water pump 18 and a water pipe, and the power of the water pump 18 can be adjusted to control the water sample flow in the experimental process; the spray header 19 is located organic glass sleeve 21 top, and screw 20 is arranged in organic glass sleeve 21 to be located pervious concrete layer top, control screw 20's rotational speed, can simulate pervious concrete blocking test under the different horizontal runoff intensity.
The left side of the present embodiment is described with reference to fig. 1, in order to make the apparatus structure more clear to those skilled in the art, but not limited to the above; the rainfall simulation device is arranged on the right side, the front side or the rear side of the organic glass sleeve, is essentially the same as the technical scheme, and still belongs to the protection content of the invention.
A method for simulating a permeable concrete blocking mechanism under a real rainfall condition is carried out by utilizing the device, and comprises the following specific steps:
(a) placing a test piece comprising a pervious concrete layer 24, a cushion layer 25 and a base layer 26 into a NaCl solution with the concentration of 10% to be soaked for 24 hours to enable the test piece to reach a saturated state; then, vaseline is smeared on the side wall of the pervious concrete layer 24, a flexible rubber pad is sleeved on the side wall to prevent the side wall from permeating, and the three-layer test piece is placed into an organic glass sleeve 21 according to the sequence of a figure 1.
(b) Adding tap water into the water sample preparation box 28, adding a certain amount of sediment mixed particles into the water body, doping NaCl, regulating the NaCl concentration of the water sample to be 10%, and starting the stirrer 22 positioned in the water sample preparation box 28 to uniformly distribute the sediment mixed particles in the water sample; the silt mixed particles can be a mixture of agricultural soil, organic matters and blocking particles with different particle sizes, and components of real rainwater are simulated.
(c) The water pump 18 is started, the water sample in the water sample preparation box 28 is conveyed into the organic glass sleeve 21 through the spray head 19, the propeller 20 above the test piece drives the water flow to flow horizontally, the scouring effect of horizontal runoff is simulated, and the horizontal runoff with different strengths is simulated by controlling the rotating speed of the propeller 20.
(d) Opening a fourth water valve 4, enabling a water sample to pass through three layers of test pieces to flow to the bottom of the organic glass sleeve 21 through osmosis, measuring water head difference values of the upper side and the lower side of each layer of test pieces through a first water pressure sensor 5, a second water pressure sensor 6, a third water pressure sensor 7 and a fourth water pressure sensor 8, collecting effluent water samples through a water collecting tank 27, measuring weight changes of the effluent water samples through a gravity sensor 15 at the bottom of the water collecting tank 27, and calculating changes of the permeability of the test pieces; selecting a power supply 12, and knowing the power supply voltage, wherein the current sensor 13 measures the current value, the resistivity is calculated according to the power supply voltage and the numerical value of the current sensor 13, and the change of the corresponding water flow velocity is obtained according to the change condition of the resistivity;
the gravity sensor 15 feeds back the weight W of the water body flowing through the test piece in real time, and the flow velocity v of water in the test piece at each moment can be calculated according to the following formula:
in the formula, Q is the water quantity passing through the test piece in unit time, rho is the water density, and A is the area of the test piece.
The pressure sensor can feed back the water pressure value h on the upper surface of the test piece in real time1And the surface water pressure value h2The hydraulic gradient i can be calculated by the following formula:
the permeability coefficient of the test piece can be obtained by utilizing Darcy's law:
meanwhile, the blocking condition among communicated gaps in the pervious concrete can be judged by measuring the change condition of the resistance between the upper surface electrode and the lower surface electrode of the test piece. When the resistivity obtained by measurement is higher, the through hole gap in the test piece is reduced, the inner part of the pervious concrete layer is blocked, and the higher the resistivity is, the more serious the blockage is. In order to carry out resistivity test, NaCl solution is doped into a water sample to be used as a conductive medium, iron wires are arranged on the upper surface and the lower surface of a test piece to be used as conductive electrodes and connected with a power supply and a current sensor, and the current sensor transmits data to a data processing system in real time. The calculation formula of the resistivity lambda of the test piece is as follows:
wherein, U is voltage, I is current, A is concrete sample cross-sectional area, and L is sample height.
(e) In the experimental process, the first water valve 1, the second water valve 2 and the third water valve 3 are opened every 2min to collect water samples at different time and different position heights, and the collected water samples are processed and analyzed. The obtained water samples are analyzed by a laser particle size analyzer to obtain the difference of particle size distribution in the three water samples, so that the distribution condition of the blocking particles along with time and radial height is known, and the influence effect of the blocking particles with specific particle sizes on each permeable pavement structure layer is obtained.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (9)
1. The utility model provides a device of concrete that permeates water under simulation true rainfall condition blocks up mechanism, includes the organic glass sleeve, its characterized in that: the upper end of the organic glass sleeve is open, and the side wall of the upper end is provided with an overflow port; placing a test piece in an organic glass sleeve, wherein the test piece comprises a permeable concrete layer, a cushion layer and a base layer which are sequentially stacked from top to bottom; an upper iron wire mesh is arranged on the upper surface of the pervious concrete layer, a lower iron wire mesh is arranged on the lower surface of the base layer, and a power supply and a current sensor are connected between the upper iron wire mesh and the lower iron wire mesh;
four water pressure sensors are arranged on one side of the organic glass sleeve from top to bottom, wherein the four water pressure sensors are respectively a first water pressure sensor, a second water pressure sensor, a third water pressure sensor and a fourth water pressure sensor; the first water pressure sensor is positioned on the upper side of the pervious concrete layer, the second water pressure sensor is positioned between the pervious concrete layer and the cushion layer, the third water pressure sensor is positioned between the cushion layer and the base layer, and the fourth water pressure sensor is positioned on the lower side of the base layer;
the other side of the organic glass sleeve is provided with four water outlets from top to bottom, the water outlets are respectively connected with drain pipes, and a first water valve, a second water valve, a third water valve and a fourth water valve are respectively arranged on the four drain pipes from top to bottom; the first water valve is positioned at the lower side of the permeable concrete layer, the second water valve is positioned at the lower side of the cushion layer, the third water valve is positioned at the lower side of the base layer, and the fourth water valve is positioned at the bottom of the organic glass sleeve; a drain pipe corresponding to the fourth water valve is connected with a water collecting tank, and a gravity sensor is placed at the bottom of the water collecting tank; the drain pipes corresponding to the first water valve, the second water valve and the third water valve are respectively connected with a water collecting cup;
the utility model discloses a rain water treatment device, including organic glass sleeve, water sample preparation case, water pump, shower head, mixer and screw, organic glass sleeve left side is equipped with the rainfall simulation device, the rainfall simulation device includes water sample preparation case, water pump, shower head, mixer and screw, water sample preparation case is placed in organic glass sleeve left side, and the mixer setting is in water sample preparation incasement, through water pump and water piping connection between water sample preparation case and the shower head, and the shower head is located organic glass sleeve's top, and the screw is arranged in organic glass sleeve to be located.
2. The device for simulating the pervious concrete plugging mechanism under the real rainfall condition according to claim 1, wherein: the organic glass sleeve is of a three-layer detachable structure and is divided into an upper layer, a middle layer and a lower layer, and the two adjacent layers are connected through a spiral bayonet; the outside of the joint of the upper layer and the middle layer is wrapped by rubber and then hooped by a hose clamp, and the joint of the middle layer and the lower layer is fastened by a fixing bolt.
3. The device for simulating the pervious concrete plugging mechanism under the real rainfall condition according to claim 1, wherein: and vaseline is smeared on the side wall of the pervious concrete layer, and a flexible rubber pad is sleeved on the side wall of the pervious concrete layer.
4. The device for simulating the pervious concrete plugging mechanism under the real rainfall condition according to claim 1, wherein: the pervious concrete layer is 80mm in thickness, the cushion layer is 30mm in thickness, and the base layer is 500mm in thickness.
5. The device for simulating the pervious concrete plugging mechanism under the real rainfall condition according to claim 4, wherein: the cushion layer is a gravel cushion layer, and the particle size distribution is 2-6 mm; the base course is the gravel base course, and the particle size distribution is 4~25 mm.
6. The device for simulating the pervious concrete plugging mechanism under the real rainfall condition according to claim 1, wherein: the overflow gaps comprise three overflow gaps with different heights, and the distance between every two adjacent overflow gaps is 10 cm.
7. The device for simulating the pervious concrete plugging mechanism under the real rainfall condition according to claim 1, wherein: and a filter screen is arranged at the water outlet of the drain pipe corresponding to the fourth water valve.
8. The device for simulating the pervious concrete plugging mechanism under the real rainfall condition according to claim 1, wherein: the current sensor, the first to fourth water pressure sensors and the gravity sensor are connected with a data processing system through data lines, and the data processing system is connected with a PC terminal.
9. A method of simulating the pervious concrete plugging mechanism in real rainfall conditions using the apparatus of any of claims 1 to 8, wherein: the method comprises the following specific steps:
(a) placing a test piece comprising a pervious concrete layer, a cushion layer and a base layer into a NaCl solution with the concentration of 10% to be soaked for 24 hours to enable the test piece to reach a saturated state; then coating vaseline on the side wall of the pervious concrete layer, sleeving a flexible rubber pad on the side wall, and putting the three-layer test piece into an organic glass sleeve;
(b) adding tap water into a water sample preparation box, adding a certain amount of silt mixed particles into a water body, doping NaCl, regulating the NaCl concentration of the water sample to be 10%, and starting a stirrer positioned in the water sample preparation box to uniformly distribute the silt mixed particles in the water sample;
(c) starting a water pump, conveying a water sample in a water sample preparation box into an organic glass sleeve through a spray head, driving a water flow to flow horizontally by a propeller above a test specimen, simulating the scouring action of horizontal runoff, and simulating the horizontal runoff with different strengths by controlling the rotating speed of the propeller;
(d) opening a fourth water valve, enabling a water sample to pass through the three layers of test pieces to flow to the bottom of the organic glass sleeve under the action of osmosis, measuring the water head difference value of the upper side and the lower side of each layer of test piece through the first water pressure sensor, the second water pressure sensor, the third water pressure sensor and the fourth water pressure sensor, collecting the effluent water sample through the water collecting tank, measuring the weight change of the effluent water sample through a gravity sensor at the bottom of the water collecting tank, and calculating the change condition of the osmosis of the test piece; calculating the resistivity through the power supply voltage and the current sensor value, and acquiring the change of the corresponding water flow velocity through the change condition of the resistivity;
(e) in the experimental process, the first water valve, the second water valve and the third water valve are opened every 2min to collect water samples at different time and different position heights, the collected water samples are processed and analyzed, the distribution conditions of the blocking particles along with time and radial height are obtained, and the influence effect of the blocking particles with specific particle sizes on various permeable pavement structure layers is obtained.
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