CN116448379A - Water tank test device for simulating vertical distribution of water flow sediment and application method thereof - Google Patents
Water tank test device for simulating vertical distribution of water flow sediment and application method thereof Download PDFInfo
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- CN116448379A CN116448379A CN202310341995.7A CN202310341995A CN116448379A CN 116448379 A CN116448379 A CN 116448379A CN 202310341995 A CN202310341995 A CN 202310341995A CN 116448379 A CN116448379 A CN 116448379A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 249
- 238000012360 testing method Methods 0.000 title claims abstract description 72
- 239000013049 sediment Substances 0.000 title claims abstract description 59
- 238000009826 distribution Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 81
- 238000003756 stirring Methods 0.000 claims abstract description 80
- 239000002002 slurry Substances 0.000 claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 238000004088 simulation Methods 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 28
- 239000002689 soil Substances 0.000 claims description 15
- 239000011148 porous material Substances 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000004568 cement Substances 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000011160 research Methods 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 239000004831 Hot glue Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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Abstract
The invention discloses a water tank test device for simulating vertical distribution of water flow sediment and a use method thereof. The water supply system outside the water tank is used for supplying water for the water tank by connecting a water suction pump with a water supply flow valve; a first-stage turbulence pipe and a second-stage turbulence pipe in the water tank form a turbulence system; the steel plate is positioned above the first-level turbulence pipe, is fixedly connected with the outer steel frame of the water tank, the booster pump is fixed on the steel plate, is connected with the stirring barrel through a guide pipe, the electric motor controls the stirring barrel to stir, the valve is arranged on the guide pipe between the slurry flow valve and the stirring barrel, and the slurry flow valve is connected with the sand outlet through the guide pipe to form a sand control system. The three systems are combined with the water tank to form a test device capable of controlling the vertical distribution of cement sand. The invention realizes that the simulation test condition is more consistent with the actual condition, thereby enhancing the accuracy of the test result.
Description
Technical Field
The invention relates to the technical field of model test design, in particular to a water tank test device for simulating vertical distribution of water flow sediment and a use method thereof.
Background
At present, river sedimentation is studied shallowly, many complex problems are not studied clearly, and accurate prediction is difficult to be carried out through theoretical analysis and numerical model tests, so that a large number of tests are required to study river sedimentation rules. However, because the condition of the field test is complex, the test condition is difficult to control, and therefore, the solution needs to be researched and solved by a model test, and the research level of sediment accumulation mechanism and prevention and control is improved.
In the field of river sedimentation research, water tank testing is a common research method. By utilizing special water tank equipment and device, the change of sediment in the forming, carrying and depositing processes and the space accumulation pattern of sediment deposition products are researched, and theoretical basis is provided for the related research of river silt prevention and reduction. Generally speaking, the water and soil parameters in the river mainly include water flow velocity, depth, flow, sediment particle size, sediment content, and vertical distribution of sediment with different particle sizes, wherein the parameters such as water flow velocity, depth, flow, sediment particle size, sediment content, etc. can be controlled by simple means, but the vertical distribution of sediment with different particle sizes is difficult to control, so in the current research, the parameters are not discussed in most researches, and the simulated river parameters have certain errors, so that errors exist in the sedimentation rule of the test model. Therefore, a new device for controlling the vertical distribution of the particle size of the sediment in the water tank test is needed.
Disclosure of Invention
The invention provides a water tank test device for simulating vertical distribution of water flow sediment and a use method thereof, and aims to solve the technical problem of simulating the vertical distribution of sediment in a water tank test and improve the accuracy of a model water tank test result.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a water tank test device for simulating vertical distribution of water flow sediment comprises a water tank 1, a primary turbulence pipe 2, a secondary turbulence pipe 3, a water suction pump 4, a steel plate 5, a guide pipe 6, a stirring barrel 7, an electric motor 8, a booster pump 9, a valve 10, a mud flow valve 11, a water supply flow valve 12, a bottom water inlet 13 and a water outlet valve 14; the bottom water inlet (13) and the water outlet valve (14) are arranged at two ends of the water tank (1) along the longitudinal direction; it is characterized in that the method comprises the steps of,
the water tank 1 comprises a cuboid water tank and a water tank outer steel frame; the water suction pump 4 is a water supply device of the water tank 1, and is connected to a bottom water inlet 13 at one end of the water tank 1 through a water supply flow valve 12 for recording water supply, and the water suction pump 4 is fixedly connected to the outer side of the water tank 1 through a water tank outer steel frame;
the primary turbulence pipe 2 and the secondary turbulence pipe 3 are positioned in the water tank 1 and are respectively filled with a cross section of the water tank; the distance between the primary turbulence pipe 2 and the water outlet of the water pump 4 is 50-100 cm, and the distance between the secondary turbulence pipe 3 and the primary turbulence pipe 2 is 30-50 cm; the steel plate 5 is arranged at the tops of the primary turbulence pipe 2 and the secondary turbulence pipe 3, and the side edges of the steel plate are fixedly connected with the outer steel frame of the water tank; the booster pump 9 is fixed on the steel plate 5 above the secondary turbulence pipe 3, and is connected with the stirring barrel 7 fixed on the steel plate 5 above the primary turbulence pipe 2 through the guide pipe 6, so as to boost the pressure in the stirring barrel; the electric motor 8 is arranged above the stirring barrel 7 and connected with a stirrer arranged in the stirring barrel for controlling the stirring speed; the stirring barrel 7 is connected with one end of an output slurry conduit, the output slurry conduit is sequentially connected with the slurry flow valve 11 and the valve 10 for controlling the sand discharge rate, and the other end of the output slurry conduit is connected with a sand discharge port of the primary turbulence pipe 2; the water outlet valve 14 is positioned at the tail end of the water tank and is used for controlling the depth and flow of the water tank.
The device is characterized in that the primary turbulence pipe 2 is formed by arranging central pore channels of a plurality of cylinders 21 with the diameter of 10-16 cm along the longitudinal horizontal direction of the water tank, arranging the central pore channels in an aligned mode according to the axial lines of the cylinders, the circumferential surfaces of the cylinders are mutually parallel, the horizontal direction and the plumb direction, arranging the cylinders from top to bottom into 5-10 layers, filling a cross section in the water tank, and the length of each cylinder is 20-30 cm, wherein the length of each cylinder can be properly adjusted according to different width and depth of the water tank.
The device is characterized in that the secondary turbulence pipe 3 is formed by arranging a plurality of cylinders II 31 with diameters of 5-8 cm along the longitudinal horizontal direction of the water tank, arranging the central pore canal of the secondary turbulence pipe in an aligned mode according to the mutual parallel of the axial lines of the cylinders II, the mutual connection of the circumferential surfaces and the horizontal direction and the plumb direction, arranging the cylinders II from top to bottom to form a plurality of layers until the cross section of the water tank is filled, wherein the length of each cylinder is 10-20 cm, and the distribution of sediment particles in the water is more uniform by adopting cylinders II with diameters smaller than the diameter of the cylinders I through the diversion of the cylinder walls.
The device is characterized in that a plurality of stirring barrels 7 are arranged, the stirring barrels share one booster pump, namely one end of each guide pipe 6 is connected with the booster pump 9, and the other end of each guide pipe is connected with each stirring barrel 7 in parallel; each stirring barrel is controlled by an electric motor 8, and the output slurry conduit 700 of each stirring barrel 7, a slurry flow valve 11 and a valve 10 connected with the output slurry conduit 700 form a group of controllable sand discharging modules controlled by the valves;
the first-stage turbulence pipes are respectively provided with sand outlet branch pipes 702 with the same height in the first cylinders 21 of the same layer in the horizontal direction, the bottom of each sand outlet branch pipe is provided with a sand outlet 703, and the sand outlets of the sand outlet branch pipes of the same layer are at the same height; the sand outlet branch pipes of the first cylinder of the same layer are all connected with the sand outlet main pipe 701 which is arranged horizontally in parallel, and are connected with the output slurry guide pipes 700 of a group of controllable sand outlet modules through the sand outlet main pipe, so that the control of the sediment quantity contained in water flows with different depths is realized; each group of controllable sand outlet modules is only connected with a sand outlet main pipe of one layer of pipeline in the first-stage turbulent flow pipe, the same slurry flow valve outputs slurry for each sand outlet of the same layer, and the number of the controllable sand outlet modules corresponds to the number of layers of the pipeline above and below the first-stage turbulent flow pipe.
The using method of the water tank test device for simulating the vertical distribution of water flow sediment comprises the steps of setting test parameters of simulated sediment in a water tank; preparing mud in the stirring barrel, respectively configuring corresponding grading soil samples corresponding to sediment test parameters of different depth layers of the water tank, and pouring the grading soil samples into the stirring barrel of a sand outlet corresponding to the depth layer position of the corresponding water tank; the stirring barrel is used for mixing and stirring the silt and water which are prepared with the gradation into slurry, and the stirring barrel is continuously stirred during the test, so that the silt in the slurry is uniformly distributed, and the blocking phenomenon of blocky or sand discharge is prevented; a stirring barrel is connected with a plurality of sand outlets of the same layer of pipeline in the first-stage turbulent flow pipe through a controllable sand outlet module, and flow valves through which slurry output by the sand outlets of the same layer pass are identical, so that the sand outlet speed at the same depth is identical.
The method comprises the steps of preparing the mud, wherein the mass of the middle soil particles is m 1 The water adding amount of the prepared slurry is m 2 The mud and sediment concentration prepared in the stirring barrel is S 0 Taking 0.5, i.e. m 1 /m 2 ＝0.5。
According to the method, the stirring barrel is connected with the booster pump through the guide pipe, and the booster pump can keep the pressure in the stirring barrel so as to keep the sand outlet speed stable;
the calculation of the sediment concentration S of each layer of water flow simulated by the water tank meets the formula 1:
wherein Q1 is the water pumping flow of the water pump recorded by the water supply flow valve, Q2 is the configured slurry flow recorded by the slurry flow valve, H is the simulation depth of the simulation water tank test, S 0 The concentration of the sediment is configured in the stirring barrel, and D is the diameter of a primary turbulent flow pipe;
budget Q 2 The value is as follows: according to the sediment concentration S of each layer of the simulated sediment test parameters of the water tank and the simulated depth H of the simulated water tank test, the Q of the mud flow valve required by each layer is calculated by adopting the formula 1 2 A value; and is controlled to reach Q through a mud flow valve (11) 2 Values.
The water pump is a water supply device, is fixed on the outer side of a water tank, and is connected with a water supply flow valve to form a water supply system; the primary turbulence pipe and the secondary turbulence pipe are positioned in the water tank and fixedly connected with the water tank through a steel frame to form a turbulence system; the steel plate is positioned above the primary turbulence pipe, is fixedly connected with the outer steel frame of the water tank, the booster pump is fixed on the steel plate and is connected with the stirring barrel through a conduit, the electric motor is positioned on the stirring barrel, the valve is arranged on the conduit between the slurry flow valve and the stirring barrel, and the slurry flow valve is connected with the sand outlet through the conduit to form a sand control system. The three systems are combined with the water tank to form a test device capable of controlling the vertical distribution of cement sand.
The invention has the beneficial effects that:
according to the invention, the grain size distribution of different depths in the test water tank can be controlled through the grain size configuration of the sediment in the stirring barrel, so that the phenomenon of different grain size distribution at different depths in an actual river channel is realized; through parameter conversion, the sediment concentration at different depths in the artificial control simulation water tank test is realized, so that the simulation test condition is more consistent with the actual condition, and the accuracy of the test result is enhanced.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic plan view of a primary turbulence tube in a flume of the present invention;
FIG. 3 is a schematic plan view of a two-stage turbulent tube in a trough of the present invention.
Description of the drawings: 1, a water tank; 2-a first order turbulence tube; cylinder one-21; 3-a secondary turbulence tube; cylinder two-31; 4, a water suction pump; 5-a steel plate; 6-a catheter; 7, a stirring barrel; 700—output mud conduit; sand outlet header pipe 701; sand out branch pipe-702; sand outlet-703; 8-an electric motor; 9-booster pump; 10-valve; 11—a flow valve; a water supply flow valve-12; a bottom water inlet-13; and a water outlet valve 14.
Detailed Description
The following describes the technical scheme of the present invention in detail by referring to the drawings in the embodiments of the present invention, and the embodiments are only for illustrating the technical features and concepts of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made according to the essence of the present invention should be included in the scope of the present invention.
Referring to fig. 1, the water tank test device for simulating vertical distribution of water flow sediment comprises a water tank 1, a primary turbulence pipe 2, a secondary turbulence pipe 3, a water pump 4, a steel plate 5, a guide pipe 6, a stirring barrel 7, an electric motor 8, a booster pump 9, a valve 10, a mud flow valve 11, a water supply flow valve 12, a bottom water inlet 13 and a water outlet valve 14;
the water tank 1 comprises a cuboid water tank and a water tank outer steel frame; the outer steel frame of the water tank and the water tank is of a traditional structure and will not be described again; the bottom water inlet (13) and the water outlet valve (14) are arranged at two ends of the water tank (1) along the longitudinal direction; the water suction pump 4 is a water supply device of the water tank 1, and is connected to a bottom water inlet 13 at one end of the water tank 1 through a water supply flow valve 12 for recording water supply, and the water suction pump 4 is fixedly connected to the outer side of the water tank 1 through a water tank outer steel frame; the water outlet valve 14 is positioned at the tail end of the water tank and used for controlling the water tank to drain, the water outlet is arranged at the bottom of the tail end of the water tank 1, and the water outlet valve 14 is arranged at the water outlet;
the primary turbulence pipe 2 and the secondary turbulence pipe 3 are positioned in the water tank 1 and are respectively filled with a cross section of the water tank; the distance between the primary turbulence pipe 2 and the water outlet of the water pump 4 is 50-100 cm, and the distance between the secondary turbulence pipe 3 and the primary turbulence pipe 2 is 30-50 cm, so that sediment flowing out of the primary turbulence pipe is uniformly mixed; the steel plate 5 is arranged at the tops of the primary turbulence pipe 2 and the secondary turbulence pipe 3, and the side edges of the steel plate are fixedly connected with the outer steel frame of the water tank; the booster pump 9 is fixed on the steel plate 5 above the secondary turbulence pipe 3, and is connected with the stirring barrel 7 fixed on the steel plate 5 above the primary turbulence pipe 2 through the guide pipe 6, so as to boost the pressure in the stirring barrel; the electric motor 8 is arranged above the stirring barrel 7 and connected with a stirrer arranged in the stirring barrel and used for controlling the stirring speed, and the stirrer adopts a traditional structure; the stirring barrel 7 is connected with one end of an output slurry conduit, the output slurry conduit 700 is sequentially connected with the slurry flow valve 11 and the valve 10 and is used for controlling the sand discharge rate, and the other end of the output slurry conduit is connected with a sand discharge port of the primary turbulence pipe 2.
Referring to fig. 2, the device is characterized in that the first-stage turbulence pipe 2 is formed by arranging central pore canal of a plurality of cylinders 21 with diameters of 10-16 cm along the longitudinal horizontal direction of the water tank, arranging the central pore canal of each cylinder along the axial line of each cylinder in parallel, mutually connecting the circumferential surfaces, and aligning the axial lines of the horizontal direction and the plumb direction, wherein the first cylinders are arranged from top to bottom to form 5-10 layers, and fill a cross section in the water tank, and the length of each cylinder is 20-30 cm and can be properly adjusted according to different width and depth of the water tank. The cylinder I21 is a cylinder body with central pore canals penetrating through two ends, after being orderly arranged, each central pore canal forms a plurality of pipelines of a first-stage turbulent flow pipe, the first-stage turbulent flow pipe is arranged into a plurality of pipelines of a wall body, and water in a water tank flows out of a plurality of pipelines of the first-stage turbulent flow pipe to realize turbulent flow; the first cylinders are fixed by hot melt adhesive in parallel to the direction of the water tank.
Referring to fig. 3, the device is shown in fig. 3, wherein the secondary turbulence pipe 3 is formed by arranging a plurality of cylinders two 31 with diameters of 5-8 cm along the longitudinal horizontal direction of the water tank, connecting the axes of the cylinders two in parallel, connecting the circumferential surfaces with each other, aligning the axes of the horizontal direction and the plumb direction, arranging the cylinders two from top to bottom into a plurality of layers until the cross section of the water tank is filled, adopting cylinders two with diameters smaller than those of the cylinders one, and distributing the silt particles in the water more uniformly through the wall of each cylinder. The second cylinder is a cylinder body with central pore canals penetrating through two ends, after the second cylinder is orderly arranged, each central pore canal forms a plurality of pipelines of a second-stage turbulent flow pipe, the second-stage turbulent flow pipe is arranged into a plurality of pipelines of a wall body, and water in the water tank flows out of the plurality of pipelines of the second-stage turbulent flow pipe to realize turbulent flow; the two cylinders are fixed by adopting hot melt adhesive in parallel to the direction of the water tank, and the two cylinders with smaller diameters than the first cylinder are used for further turbulence of water turbulent by the first-stage turbulent flow pipe.
Referring to fig. 2, the device is provided with a plurality of stirring barrels 7, wherein the stirring barrels share a booster pump, that is, one end of the conduit 6 is connected with the booster pump 9, and the other end is connected with each stirring barrel 7 in parallel; each stirring barrel is controlled by an electric motor 8, and the output slurry conduit 700 of each stirring barrel 7, a slurry flow valve 11 and a valve 10 connected with the output slurry conduit 700 form a group of controllable sand discharging modules controlled by the valves; each stirring barrel 7 is provided with a group of controllable sand discharging modules controlled by valves;
referring to fig. 2, the first-stage turbulence pipes are respectively provided with vertically arranged sand outlet branch pipes 702 with equal height in each cylinder one 21 of the same layer in the horizontal direction, and each sand outlet branch pipe is provided with a sand outlet 703 at the bottom, and the sand outlets of the sand outlet branch pipes of the same layer are equal in height; the sand outlet branch pipes of the first cylinder of the same layer are all connected with the sand outlet main pipe 701 which is arranged horizontally in parallel, and are connected with the output slurry guide pipes 700 of a group of controllable sand outlet modules through the sand outlet main pipe, so that the control of the sediment quantity contained in water flows with different depths is realized; each group of controllable sand outlet modules is only connected with a sand outlet main pipe of one layer of pipeline in the first-stage turbulent flow pipe, the same slurry flow valve is used for outputting slurry from each sand outlet of the same layer, and the number of the controllable sand outlet modules corresponds to the number of layers of the pipeline above and below the first-stage turbulent flow pipe.
The invention relates to a use method of a water tank test device for simulating vertical distribution of water flow sediment, which comprises the steps of setting test parameters for simulating sediment in a water tank; preparing mud in the stirring barrel, respectively configuring corresponding grading soil samples corresponding to sediment test parameters of different depth layers of the water tank, and pouring the grading soil samples into the stirring barrel of a sand outlet corresponding to the depth layer position of the corresponding water tank; the stirring barrel is used for mixing and stirring the silt and water which are prepared with the gradation into slurry, and the stirring barrel is continuously stirred during the test, so that the silt in the slurry is uniformly distributed, and the blocking phenomenon of blocky or sand discharge is prevented; a stirring barrel is connected with a plurality of sand outlets of the same layer of pipeline in the first-stage turbulent flow pipe through a controllable sand outlet module, and flow valves through which slurry output by the sand outlets of the same layer pass are identical, so that the sand outlet speed at the same depth is identical.
The method comprises the steps of preparing the mud, wherein the mass of the middle soil particles is m 1 The water adding amount of the prepared slurry is m 2 The mud and sediment concentration prepared in the stirring barrel is S 0 Taking 0.5, i.e. m 1 /m 2 ＝0.5。
According to the method, the stirring barrel is connected with the booster pump through the guide pipe, and the booster pump can keep the pressure in the stirring barrel so as to keep the sand outlet speed stable;
the calculation of the sediment concentration S of each layer of water flow simulated by the water tank meets the formula 1:
wherein Q1 is the water pumping flow of the water pump recorded by the water supply flow valve, Q2 is the configured slurry flow recorded by the slurry flow valve, H is the simulation depth of the simulation water tank test, S 0 The concentration of the sediment is configured in the stirring barrel, and D is the diameter of a primary turbulent flow pipe;
budget Q 2 The value is as follows: according to the sediment concentration S of each layer of the simulated sediment test parameters of the water tank and the simulated depth H of the simulated water tank test, the Q of the mud flow valve required by each layer is calculated by adopting the formula 1 2 A value; and is controlled to reach Q through a mud flow valve (11) 2 Values.
The working process of the invention is now described in detail with reference to the drawings as follows:
the application method of the water tank test device for simulating the vertical distribution of water flow sediment comprises the following steps:
when the water tank test is carried out, firstly, the water suction pump 4 is started, so that the water depth in the water tank reaches the total water depth H of the test, namely the simulated water tank test simulation depth, and the flow of the water supply flow valve 12 is controlled to reach the flow Q required by the test 1 The water outlet valve 14 is opened, and the water depth of the water tank is controlled to maintain the total water depth H for test.
Then preparing slurry, respectively preparing corresponding graded soil samples in different depth ranges according to experimental simulation parameters, and weighing the mass m of soil particles 1 Weighing the mass m of the purified water 2 Wherein m is 2 ＝2m 1 After being evenly mixed and stirred, the materials are respectively poured into the stirring barrel 7 with the sand outlet 12 with the corresponding depth, and the barrel cover is covered.
According to the sediment concentration S of each layer which is simulated in the test requirement, respectively calculating the mud flow valve Q required by each layer by adopting a formula 1 2 Is a value of (2).
Then checking whether the valve 10 is in a closed state, opening the booster pump 9 after the valve 10 is closed, and slowly adjusting the valve 10 until the slurry flow valve 11 is stabilized to a calculated value when the pressure in the stirring barrel 7 is stabilized. And after the water flow is stable, starting to record the test result.
Application examples:
the following is an example of the application of the water tank test apparatus for simulating the vertical distribution of water flow sediment using the present invention.
To be subjected to the water tank test, the water tank test parameters to be simulated are as follows: the total water depth H of the test in the water tank is 1m, wherein the particle size range of the test is 0-0.075 mm, the median particle size is 0.02mm, and the concentration is 200mg/L in the depth range of 0-0.2 m. The test range of 0.2-0.4m depth, the particle size range of 0-0.075 mm, the median particle size of 0.04mm and the depth sediment concentration of 400mg/L. The test depth is 0.4-0.6m, the particle size is 0-0.075 mm, the median diameter is 0.06mm, and the sediment concentration is 600mg/L. The test depth is 0.6-0.8m, the particle size is 0-0.025 mm, the median diameter is 0.10mm, and the sediment concentration is 800mg/L. The test depth is 0.8-1.0m, the particle size is 0-0.025 mm, the median diameter is 0.15mm, and the sediment concentration is 1000mg/L. The sediment concentration of each layer is independently controlled through a corresponding flow valve.
The test device provided by the invention is used for simulating a water tank test, and the test is carried out by adopting 5 layers of a primary turbulence pipe with the diameter of 20cm and 10 layers of a secondary turbulence pipe with the diameter of 10 cm. When the water tank test is carried out, firstly, the water suction pump 4 is started to ensure that the water depth in the water tank reaches 1.0m of the total water depth of the test, and the flow of the water supply flow valve 12 is controlled to reach 10m of the flow required by the test 3 And/h, opening the water outlet valve 14, and controlling the water depth of the water tank to keep the total water depth of the test to be 1.0m.
Then slurry preparation in a stirring barrel is carried out, corresponding grading soil samples are respectively arranged corresponding to different depths of a water tank, and the particle size ranges of 0-0.075 mm and the median particle size of 0.02mm are respectively arranged. The particle size range is 0-0.075 mm, and the median particle size is 0.04mm. The particle size range is 0-0.075 mm, and the median particle size is 0.06mm. Soil samples with particle sizes ranging from 0 to 0.025mm, median sizes ranging from 0.10mm, particle sizes ranging from 0 to 0.025mm and median sizes of 0.15 mm. Respectively weighing 500g of soil samples with corresponding particle size ranges, respectively adding into 1L of water, mixing, stirring, respectively pouring into stirring barrels with sand outlets with corresponding depths, and covering the barrel cover.
Then checking whether the valve 10 is in a closed state, opening the booster pump 9 after the valve 10 is closed, slowly adjusting the valve 10 to the slurry flow valve 11 to stabilize the slurry flow valve Q when the pressure in the stirring barrel 7 is stable 2 And calculating a value. Calculating the mud flow valve Q with different depth ranges according to a formula I 2 At a depth of 0-0.2m, the depth corresponding to the mud flow valve Q 2 Has a value of 8 x 10 -4 m 3 /h, for example: the calculation process of the range of 0-0.2 is as follows:
0.2-0.4m, and controlling the depth to correspond to the mud flow valve Q 2 Has a value of 16 x 10 -4 m 3 And/h. At the depth of 0.4-0.6m, controlling the depth to correspond to the mud flow valve Q 2 Has a value of 24 x 10 -4 m 3 And/h. At the depth of 0.6-0.8m, controlling the depth to correspond to the mud flow valve Q 2 Has a value of 32 x 10 -4 m 3 And/h. At the depth of 0.8-1.0m, controlling the depth to correspond to the mud flow valve Q 2 Has a value of 40 x 10 -4 m 3 And/h. The water outlet valve 14 was opened and the water depth of the tank was controlled to be kept to 1.0m of the total water depth tested. And after the water flow is stable, starting to record the test result.
Claims (7)
1. A water tank test device for simulating vertical distribution of water flow sediment comprises a water tank (1), a primary turbulence pipe (2), a secondary turbulence pipe (3), a water pump (4), a steel plate (5), a guide pipe (6), a stirring barrel (7), an electric motor (8), a booster pump (9), a valve (10), a mud flow valve (11), a water supply flow valve (12), a bottom water inlet (13) and a water outlet valve (14); the bottom water inlet (13) and the water outlet valve (14) are arranged at two ends of the water tank (1) along the longitudinal direction; it is characterized in that the method comprises the steps of,
the water tank (1) comprises a cuboid water tank and a water tank outer steel frame; the water suction pump (4) is a water supply device of the water tank (1), and is connected with a bottom water inlet (13) at one end of the water tank (1) through a water supply flow valve (12) for recording water supply, and the water suction pump (4) is fixedly connected to the outer side of the water tank (1) through a water tank outer steel frame;
the primary turbulence pipe (2) and the secondary turbulence pipe (3) are positioned in the water tank (1) and are respectively filled with a cross section of the water tank; the distance between the primary turbulence pipe (2) and the water outlet of the water pump (4) is 50-100 cm, and the distance between the secondary turbulence pipe (3) and the primary turbulence pipe (2) is 30-50 cm; the steel plate (5) is arranged at the tops of the primary turbulence pipe (2) and the secondary turbulence pipe (3), and the side edges of the steel plate are fixedly connected with the outer steel frame of the water tank; the booster pump (9) is fixed on the steel plate (5) above the secondary turbulent flow pipe (3), and is connected with the stirring barrel (7) fixed on the steel plate (5) above the primary turbulent flow pipe (2) through the guide pipe (6) for pressurizing the interior of the stirring barrel; the electric motor (8) is positioned above the stirring barrel (7) and connected with a stirrer positioned in the stirring barrel, and is used for controlling the stirring rate; the stirring barrel (7) is connected with one end of an output slurry conduit, the output slurry conduit is sequentially connected with a slurry flow valve (11) and a valve (10) for controlling sand discharge rate, and the other end of the output slurry conduit is connected with a sand discharge port of the primary turbulence pipe (2).
2. The device according to claim 1, characterized in that said primary turbulence tube (2) is formed by arranging the central duct of a plurality of cylinders (21) with diameters of 10-16 cm along the longitudinal horizontal direction of the water tank, and arranging the cylinders in alignment according to the mutual parallel of the axes of the cylinders, the mutual connection of the circumferential surfaces and the horizontal and plumb directions, and the cylinders are arranged in 5-10 layers from top to bottom to fill up a cross section in the water tank, and the length of each cylinder is 20-30 cm, and can be properly adjusted according to different width and depth of the water tank.
3. The device according to claim 2, characterized in that the secondary turbulence pipe (3) is formed by arranging a plurality of cylinders II (31) with the diameter of 5-8 cm along the longitudinal horizontal direction of the water tank, arranging the central pore canal of the cylinders II in parallel with each other according to the axial lines of the cylinders II, connecting the circumferential surfaces of the cylinders II with each other, and aligning the cylinders II in the horizontal direction and the plumb direction, arranging the cylinders II from top to bottom into a plurality of layers until the cross section of the water tank is filled, the length of each cylinder is 10-20 cm, and the distribution of sediment particles in the water is more uniform by dividing the wall of each cylinder with the cylinder II with the diameter smaller than the diameter of the cylinder I.
4. The device according to claim 1, characterized in that a plurality of stirring barrels (7) are arranged, and a plurality of stirring barrels share a booster pump, namely one end of the guide pipe (6) is connected with the booster pump (9), and the other end is connected with each stirring barrel (7) in parallel; each stirring barrel is controlled by an electric motor (8), and the output slurry conduit (700) of each stirring barrel (7) and a slurry flow valve (11) and a valve (10) connected with the output slurry conduit form a group of controllable sand discharging modules controlled by the valves;
the first-stage turbulence pipes are respectively provided with sand outlet branch pipes (702) with the same height in each cylinder one (21) of the same layer in the horizontal direction, and the bottom of each sand outlet branch pipe is provided with a sand outlet (703), and the sand outlets of the sand outlet branch pipes of the same layer are at the same height; the sand outlet branch pipes of the first cylinder of the same layer are connected with a sand outlet main pipe (701) which is arranged horizontally in parallel, and the sand outlet main pipe is connected with the output slurry guide pipes (700) of a group of controllable sand outlet modules, so that the control of the sediment quantity contained in water flows with different depths is realized; each group of controllable sand outlet modules is only connected with a sand outlet main pipe of one layer of pipeline in the first-stage turbulent flow pipe, the same slurry flow valve outputs slurry for each sand outlet of the same layer, and the number of the controllable sand outlet modules corresponds to the number of layers of the pipeline above and below the first-stage turbulent flow pipe.
5. A method of using a flume test rig for simulating the vertical distribution of water flow sediment as defined in claim 1, comprising: setting experimental parameters of simulated sediment in a water tank; preparing mud in the stirring barrel, respectively configuring corresponding grading soil samples corresponding to sediment test parameters of different depth layers of the water tank, and pouring the grading soil samples into the stirring barrel of a sand outlet corresponding to the depth layer position of the corresponding water tank; the stirring barrel is used for mixing and stirring the silt and water which are prepared with the gradation into slurry, and the stirring barrel is continuously stirred during the test, so that the silt in the slurry is uniformly distributed, and the blocking phenomenon of blocky or sand discharge is prevented; a stirring barrel is connected with a plurality of sand outlets of the same layer of pipeline in the first-stage turbulent flow pipe through a controllable sand outlet module, and flow valves through which slurry output by the sand outlets of the same layer pass are identical, so that the sand outlet speed at the same depth is identical.
6. The method of claim 5, wherein the mass of the soil particles in the slurry is m 1 The water adding amount of the prepared slurry is m 2 The mud and sediment concentration prepared in the stirring barrel is S 0 Taking 0.5, i.e. m 1 /m 2 ＝0.5。
7. The method of claim 6, wherein the agitator is connected to a booster pump via the conduit, the booster pump maintaining pressure in the agitator to maintain a steady sand outlet rate;
the calculation of the sediment concentration S of each layer of water flow simulated by the water tank meets the formula 1:
wherein Q1 is the water pumping flow of the water pump recorded by the water supply flow valve, Q2 is the configured slurry flow recorded by the slurry flow valve, H is the simulation depth of the simulation water tank test, S 0 The concentration of the sediment is configured in the stirring barrel, and D is the diameter of a primary turbulent flow pipe;
budget Q 2 The value is as follows: according to the sediment concentration S of each layer of the simulated sediment test parameters of the water tank and the simulated depth H of the simulated water tank test, the Q of the mud flow valve required by each layer is calculated by adopting the formula 1 2 A value; and is controlled to reach Q through a mud flow valve (11) 2 Values.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310341995.7A CN116448379A (en) | 2023-04-03 | 2023-04-03 | Water tank test device for simulating vertical distribution of water flow sediment and application method thereof |
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| CN202310341995.7A CN116448379A (en) | 2023-04-03 | 2023-04-03 | Water tank test device for simulating vertical distribution of water flow sediment and application method thereof |
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