A double-variable-slope internal circulation water tank simulation experiment device and method

Abstract

The application discloses a double-variable-slope inner circulation water tank simulation experiment device and method, and relates to the technical field of deposition simulation testing. The device comprises a water tank, at least two stages of variable-slope devices are arranged in the water tank, and the height of the water inlet of the water tank is higher than the height of the water outlet; an injection system comprises a mud pump, a mud pool is connected to the inlet end of the mud pump, and the outlet end of the mud pump is connected to the water inlet of the water tank; a circulation system comprises an overflow pool, a material collecting hopper is arranged at the bottom of the overflow pool, the material collecting hopper is connected to the water inlet of the water tank through a circulating mud pump, and one end of the overflow pool is communicated with the water inlet. During the experiment, the inner circulation can be realized through the circulation system to save the cost. The device and the method can simulate the gravity flow deposition experiment under the condition of the multi-slope folding terrain through the arrangement of the multiple variable slopes; meanwhile, the circulation system is arranged, which can prevent the rapid deposition of a large amount of mud and sand caused by the long-time injection of the mud in the single-flow water tank and save the raw materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of deposition simulation test, in particular to a double-variable-slope internal circulation water tank simulation experiment device and method. BACKGROUND

[0002] In recent years, the theory of gravity flow deposition has gradually become a research hotspot in the field of sedimentology, and the research on the movement and deposition mechanism of gravity flow is the key core. However, as a kind of solid-liquid two-phase flow, the internal force of gravity flow is complex, which contains the interaction of solid phase and liquid phase, and also involves the interaction between solid particles. In particular, the transport mechanism of coarse particles in gravity flow has not been completely clarified so far, which limits the in-depth understanding and practical application of the theory of gravity flow deposition.

[0003] At present, the main means to study the movement and deposition process of gravity flow is water tank experiment. This experimental method usually simulates the deposition process by injecting mud into a water tank with a single slope. However, the existing water tank experiment has significant shortcomings. The slope design is usually fixed or single-variable-slope, which cannot reflect the multi-slope fold topography characteristics commonly existing in natural deposition environment, and thus it is difficult to truly restore the movement and deposition behavior of gravity flow under complex topography conditions. At the same time, the existing water tank experiment is usually designed as a single flow process, and the fluid only passes through the water tank once during the experiment, which cannot simulate the long-term effect of fluid in the deposition environment, resulting in limited research capability of the experimental results on the continuous fluid and sediment interaction process. If the traditional water tank is continuously fed to simulate, the input of a large amount of mud will cause serious sediment accumulation, which may affect the subsequent experimental results and also generate a large amount of waste. In addition, the traditional water tank experiment cannot combine the characteristics of complex slope fold topography and long-term fluid action, and cannot deeply analyze the dynamic balance of sediment accumulation and erosion in the multi-slope fold environment and the controlling factors. SUMMARY

[0004] To solve at least one of the above problems, the present application provides a double-variable-slope internal circulation water tank simulation experiment device and method.

[0005] The technical scheme of the present application is as follows: a double-variable-slope internal circulation water tank simulation experiment device, comprising,

[0006] a water tank, at least two stages of slope devices are arranged in the water tank, and the height of the water inlet of the water tank is higher than the height of the water outlet;

[0007] an injection system comprising a mud pump, the inlet end of the mud pump is connected with a mud pool, and the outlet end is connected with the water inlet of the water tank;

[0008] a circulation system comprising an overflow pool, a material collecting hopper is arranged at the bottom of the overflow pool, the material collecting hopper is connected with the water inlet of the water tank through a circulating mud pump, and one end of the overflow pool is communicated with the water inlet.

[0009] One embodiment of the present application is that the water outlet of the water tank is hinged to the overflow pool, so that the water tank can rotate around the overflow pool in the vertical direction, the water tank is connected with a first lifting part, the first lifting part controls the rotation of the water tank in the vertical direction; at least one inclined plate is arranged in the water tank, the lower end of the inclined plate is hinged to the water tank, so that the inclined plate can rotate in the vertical direction, the inclined plate is connected with a second lifting part, and the second lifting part controls the rotation of the inclined plate in the vertical direction.

[0010] One embodiment of the present application is that a camera is arranged on the water tank, and a Doppler speedometer is arranged in the water tank.

[0011] One embodiment of the present application is that a stirrer is arranged on the mud pool.

[0012] One embodiment of the present application is that a flow meter is further arranged between the circulating mud pump and the water inlet, so as to monitor the flow size in the pipeline in real time.

[0013] Another object of the present application is to disclose a double-side slope internal circulation water tank simulation test method, which adopts any of the above devices, and the method comprises the following steps:

[0014] S1, the gravity flow slurry is put into the mud pool, and parameters including viscosity, bulk density, specific gravity and sand content are measured, the variable slope is adjusted to the target angle, and water is injected into the water tank;

[0015] S2, the mud pump is started and the gravity flow slurry is injected into the water tank, the fluid carrying process in the water tank is observed, and the fluid parameters including viscosity, bulk density, specific gravity and sand content are measured by layer sampling, and the flow velocity of the fluid at different positions is measured by the Doppler ultrasonic speedometer;

[0016] S3, after the collecting hopper is filled with mud, the mud pump is closed, the circulating pump is started to start internal circulation, and during the internal circulation, the fluid in the water tank is sampled and analyzed every interval, and the development form of the bottom shape at the bottom of the water tank and the migration process thereof are observed;

[0017] S4, after the bottom shape at the bottom of the water tank is stable, the internal circulation is stopped, and the water tank is kept still until the slurry in the water tank is completely deposited;

[0018] One embodiment of the present application is that the angle of the variable slope is adjusted through the first lifting part and the second lifting part.

[0019] One embodiment of the present application is that through the internal circulation device, the long-time action process of the gravity flow and the base sediment and the development law of the bottom shape can be observed.

[0020] Beneficial effects: the device of the present application can simulate gravity flow deposition experiment under multi-slope topographic conditions by setting multi-stage variable slope, which is more in line with the actual situation, so that the experimental results have good guidance for the study of the movement and deposition behavior of gravity flow under complex topographic conditions; at the same time, a circulating system is provided, which can prevent a large amount of sediment from being rapidly deposited due to long-term injection of gravity flow slurry in a single-flow water tank and save raw materials for environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the schematic diagram of the overall structure of the device of example 1.

[0022] In the figure, 1 is a water tank, 2 is an overflow pool, 3 is a circulating slurry pump, 4 is a slurry pump, 5 is a slurry pool, 6 is a stirrer, 7 is an inclined plate, 8 is a first lifting part, 9 is a second lifting part, 10 is a camera, 11 is a Doppler flowmeter, 12 is a flowmeter, and 13 is a collecting hopper. DETAILED DESCRIPTION

[0023] The specific embodiments of the present application will be described below in conjunction with examples and drawings. Obviously, the described examples are only part of the embodiments of the present application, not all.

[0024] As Figure 1 shown, a double-variable-slope internal circulation water tank simulation experiment device, comprising:

[0025] A water tank 1, at least two variable slope devices are arranged in the water tank 1, and the height of the water inlet of the water tank 1 is higher than that of the water outlet;

[0026] An injection system, comprising a slurry pump 4, the slurry pool 5 is connected to the inlet end of the slurry pump 4, and the outlet end is connected to the water inlet of the water tank 1;

[0027] A circulating system, comprising an overflow pool 2, the overflow pool 2 is provided with a collecting hopper 13 at the bottom, the collecting hopper 13 is connected to the water inlet of the water tank 1 through a circulating slurry pump 3, and one end of the overflow pool 2 is communicated with the water inlet.

[0028] Specifically, in this embodiment, the water tank 1 is the main place for the experiment, and the gravity flow slurry is settled in the water tank 1. However, compared with the conventional water tank, the difference lies in that at least two variable slope devices are arranged in the water tank 1, such as two, three or even four. In order to show the difference of the present embodiment, two variable slope devices are arranged in this embodiment, and the slope of the two variable slope devices can be adjusted according to the actual situation.

[0029] In this embodiment, a new water tank with two variable slopes is designed. The water tank 1 is hinged with the overflow pool 2 at the water outlet, so that the water tank 1 can rotate in the vertical direction. Of course, waterproof treatment is needed at the hinge of the two, such as setting a waterproof layer to avoid water or gravity flow slurry from leaking from the hinge. At the same time, similar to the conventional water tank, the water tank 1 in this embodiment is provided with a bottom plate, which can serve as one of the slopes: in order to make the angle of the bottom plate variable, a first lifting part 8 is connected to the water tank 1, which can control the rotation of the water tank 1 and in turn control the angle of the bottom plate. At the same time, the inventor also sets an inclined plate 7 in the water tank 1, which is hinged at one end of the bottom plate of the water tank 1. Similarly, a second lifting part 9 is connected to the inclined plate 7, which can control the rotation of the inclined plate 7 and in turn control the angle of the inclined plate 7. In this embodiment, as shown in Figure 1

[0030] Considering that in the prior art, the slope considered in the deposition experiment is all downhill, therefore, for the inclined plate 7, the height of the hinged end is relatively low, and during the experiment, the gravity flow slurry first sinks through the first slope formed by the inclined plate 7, and then sinks through the second slope formed by the bottom plate of the water tank 1, thereby simulating the deposition of multiple slopes.

[0031] Of course, considering the flow space of the gravity flow slurry, those skilled in the art can understand that the width of the inclined plate 7 is the same as the width of the bottom plate of the water tank 1, and the edge of the inclined plate 7 is connected with the inner wall of the water tank 1, and accessories such as rubber sheets can also be set at the edge of the inclined plate 7 to reduce the gap between the inclined plate 7 and the inner wall of the water tank 1, so as to avoid a large amount of water and gravity flow slurry from entering the lower part of the inclined plate 7.

[0032] When multiple variable slopes are provided, multiple different inclined plates 7 can be provided, and adjacent two inclined plates 7 are hinged. Those skilled in the art can also set different inclined plate 7 setting modes according to actual conditions.

[0033] For the injection system, it is mainly used for the gravity flow slurry required for the injection experiment, and similar to the conventional injection system, in this embodiment, the injection system includes a mud pool 5, one end of which is connected with a mud pump 4, and the outlet end of the mud pump 4 is provided at the water inlet of the water tank 1. In this embodiment, the water inlet of the water tank 1 is the inclined plate 7.

[0034] ​For the circulatory system, it includes a sump 2, the inlet end of the sump 2 and the water outlet of the tank 1 are hinged, the water from the tank 1 and the gravity flow slurry will enter the inside of the sump 2, and a collecting hopper 13 is arranged at the bottom of the sump 2. Due to the density and other factors, generally speaking, the gravity flow slurry will gradually settle and deposit in the tank 1, but considering the influence of the settling velocity, more gravity flow slurry will enter the sump 2 and deposit in the collecting hopper 13. In the prior art, either a relatively gentle single slope is arranged, so that the gravity flow slurry uniformly settles and deposits in the tank 1, and finally more gravity flow slurry is deposited at the end of the tank 1, which affects the experimental results; or the gravity flow slurry is discharged as waste liquid, which not only does not conform to the actual situation, but also causes great waste. Therefore, the inventor sets up a circulation: an opening is designed at the bottom of the collecting hopper 13, the opening is connected with the inlet of the circulating slurry pump 3, and the outlet of the circulating slurry pump 3 is connected with the water inlet of the tank 1.

[0035] In order to monitor the deposition phenomenon in the whole experimental process in real time, a camera 10 is arranged on the tank 1, and a Doppler speed measuring instrument 11 is arranged in the tank 1.

[0036] For the slurry tank 5, it is a place for setting the gravity flow slurry, but due to the complex composition of the gravity flow slurry, the densities of the materials in the tank are quite different, therefore, in order to avoid the stratification of the gravity flow slurry before the experiment affecting the experimental effect, a stirrer 6 is arranged on the slurry tank 5 in the embodiment.

[0037] A flow meter 12 is further arranged between the circulating slurry pump 3 and the water inlet, for monitoring the flow of the water in the pipeline. By controlling the flow of the injected fluid, the settling and deposition of different types of gravity flow can be studied.

[0038] Embodiment 2: a double-variable-slope internal circulation tank simulation experiment, using the device of embodiment 1, the method comprises the following steps:

[0039] S1, the gravity flow slurry is put into the slurry tank, and the parameters including viscosity, bulk density, specific gravity and sand content are measured, the variable slope is adjusted to the target angle, and the water body is injected into the tank. In the process, the angle of the variable slope can be adjusted through the first lifting part and the second lifting part.

[0040] S2, start the slurry pump and inject the gravity flow slurry into the tank, observe the fluid in the tank, record the fluid dynamics characteristics and stratified sampling, measure the parameters including viscosity, bulk density, specific gravity and sand content, and measure the flow velocity of the fluid at different positions by the Doppler ultrasonic speed measuring instrument.

[0041] S3, when the gravity flow slurry content in the collecting hopper is greater than the first threshold value, the mud pump is closed, the circulating mud pump is opened to start the internal circulation, and during the internal circulation, the fluid in the water tank is sampled and analyzed every interval, and the development form of the bottom shape at the bottom of the water tank and its migration process are observed.

[0042] In this step, the so-called first threshold value is usually determined according to the actual situation: when the gravity flow slurry content in the collecting hopper is relatively large, and considering the difference in the settling and discharge rate of the gravity flow slurry, there is a certain amount of gravity flow slurry in the collecting hopper during the entire internal circulation period.

[0043] At the same time, if the calculation of the first threshold value is wrong in this step, the gravity flow slurry content in the collecting hopper is insufficient to support the circulation before the completion of the circulation, in this case, we can open the mud pump to continue to inject a certain amount of gravity flow slurry into the water tank, so that it can complete the entire circulation process.

[0044] S4, after the bottom shape at the bottom of the water tank is stable, the internal circulation is stopped, and the water tank is static until the gravity flow slurry in the water tank is completely settled.

[0045] During the entire experiment, the deposition in the water tank is recorded by a camera and a Doppler velocimeter.

[0046] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiment based on the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A double-variable slope inner-circulation water tank simulation experiment device, characterized in that, The device comprises a water tank, a mud injection system, a circulating system, and a camera. The water tank is provided with at least two variable slope devices, and the water inlet of the water tank is higher than the water outlet. The mud injection system comprises a mud tank and a mud pump. The circulating system comprises an overflow tank, a collecting hopper, and a circulating mud pump. The water outlet of the water tank is hinged to the overflow tank, so that the water tank can rotate in the vertical direction around the overflow tank.

2. The apparatus of claim 1, wherein, The water tank is provided with at least one inclined plate, which is hinged to the water tank at the lower end, so that the inclined plate can rotate in the vertical direction.

3. The apparatus of claim 1, wherein, The water tank is provided with a Doppler speedometer.

4. The apparatus of claim 1, wherein, The mud tank is provided with a stirrer.

5. A method for simulating a dual-side slope inner-circulation flume test, characterized in that, A flow meter is arranged between the circulating mud pump and the water inlet to monitor the flow rate in the pipeline in real time. The device of any one of claims 1-4 comprises the following steps: S1, placing the gravity flow slurry into the mud tank and measuring the parameters including viscosity, bulk density, specific gravity, and sediment concentration, adjusting the variable slope to the target angle, and injecting water into the water tank; S2, starting the mud pump and injecting the gravity flow slurry into the water tank, observing the fluid transport process in the water tank and taking samples for layer-by-layer measurement of the parameters including viscosity, bulk density, specific gravity, and sediment concentration, and measuring the flow rate of the fluid at different positions by the Doppler ultrasonic speedometer; S3, when the content of the gravity flow slurry in the collecting hopper is greater than the first threshold value, the mud pump is turned off, the circulating mud pump is started for internal circulation, and during the internal circulation, the fluid in the water tank is sampled and analyzed every interval, and the development pattern of the bedform at the bottom of the water tank and its migration process are observed; 6. The method of claim 5, wherein, S4, after the bedform at the bottom of the water tank is stable, the internal circulation is stopped, and the water tank is kept still until the gravity flow slurry in the water tank is completely deposited.

7. The method of claim 5, wherein, The angle of the variable slope is adjusted by the first lifting part and the second lifting part. The long-term action process of the gravity flow and the bed sediment and the development law of the bedform can be observed by the internal circulation device.

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