Simulation experiment device and method for double-variable-slope internal circulation water tank

Abstract

The invention discloses a double-variable-slope internal 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 slope changing devices are arranged in the water tank, and a water inlet of the water tank is higher than a water outlet of the water tank; the injection system comprises a slurry pump, the inlet end of the slurry pump is connected with a slurry pool, and the outlet end is connected with the water inlet of the water tank; the circulating system comprises an overflow pool, a collection hopper is arranged at the bottom of the overflow pool and connected with the water inlet of the water tank through a circulating slurry pump, and one end of the overflow pool is communicated with the water inlet. And during an experiment, internal circulation can be carried out through the circulating system, so that the cost is saved. According to the device and the method disclosed by the invention, a plurality of variable slopes are arranged, so that a gravity flow deposition experiment under a multi-slope folding terrain condition can be simulated; and meanwhile, a circulating system is arranged, so that rapid deposition of a large amount of silt caused by long-time injection of mud into the single-flow water tank is prevented, environmental protection is achieved, and raw materials are saved.

Description

Technical Field

[0001] The invention relates to the technical field of sedimentation simulation testing, and in particular to a double-slope variable internal circulation water tank simulation experiment device and method. Background Art

[0002] In recent years, gravity flow deposition theory has gradually become a research hotspot in the field of sedimentology, among which the study of gravity flow movement and deposition mechanism is the key core. However, as a solid-liquid two-phase flow, gravity flow has complex internal forces, including the interaction between the solid and liquid phases, as well as the interaction between solid particles. In particular, the transport mechanism of coarse particles in gravity flow has not yet been fully clarified, which limits the in-depth understanding and practical application of gravity flow deposition theory.

[0003] At present, the main means of studying the movement and deposition process of gravity flow is the flume experiment. This experimental method usually simulates the deposition process by injecting mud into a flume with a single slope. However, the existing flume experiments have significant shortcomings. Its slope design is usually a fixed slope or a single variable slope setting, which cannot reflect the characteristics of multi-slope terrain that is common in natural sedimentary environments, and it is difficult to truly restore the movement and deposition behavior of gravity flow under complex geomorphic conditions. At the same time, most of the existing flume experiments are single-flow designs, and the fluid only passes through the flume once during the experiment, which cannot simulate the long-term effect of the fluid in the sedimentary environment, which leads to limited research capabilities of the experimental results on the continuous fluid-sediment interaction process. If the traditional flume is continuously fed for simulation, the input of a large amount of mud will cause serious sediment accumulation, which may affect the subsequent experimental results and generate a large amount of waste. In addition, the traditional flume experiment fails to combine the characteristics of complex slope-break terrain and long-term fluid action, and cannot deeply analyze the dynamic balance and controlled factors of sediment accumulation and erosion in a multi-slope-break environment. Summary of the invention

[0004] In order to solve at least one of the above problems, the present invention proposes a double-slope internal circulation water tank simulation experiment device and method.

[0005] The technical solution of the present invention is: a double-slope internal circulation water tank simulation experimental device, comprising: A water trough, wherein at least two levels of slope changing devices are provided in the water trough, and the height of the water inlet of the water trough is higher than the height of the water outlet; The injection system includes a mud pump, wherein the inlet end of the mud pump is connected to the mud pool, and the outlet end of the mud pump is connected to the water inlet of the water tank; The circulation system comprises an overflow pool, a collecting hopper is arranged at the bottom of the overflow pool, the 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 connected to the water inlet.

[0006] One embodiment of the present invention is that the water outlet of the water sink is hinged to the overflow tank so that the water sink can rotate in the vertical direction around the overflow tank, and the water sink is connected to a first lifting part, which controls the rotation of the water sink in the vertical direction; at least one inclined plate is provided in the water sink, and the lower end of the inclined plate is hinged to the water sink so that the inclined plate can rotate in the vertical direction, and the inclined plate is connected to a second lifting part, which controls the rotation of the inclined plate in the vertical direction.

[0007] An implementation manner of the present invention is that a camera is provided on the water tank, and a Doppler velocimeter is provided in the water tank.

[0008] An implementation manner of the present invention is that a stirrer is provided on the mud pool.

[0009] An implementation manner of the present invention is that a flow meter is further provided between the circulating mud pump and the water inlet to monitor the flow rate in the pipeline in real time.

[0010] Another object of the present invention is to disclose a double-sided slope internal circulation water tank simulation test method, using any of the above-mentioned devices, the method comprising the following steps: S1. Place the gravity flow slurry into the mud pool, measure its parameters including viscosity, bulk density, specific gravity and sand content, adjust the variable slope to the target angle, and inject water into the water tank; S2. Start the mud pump and inject the gravity flow slurry into the water tank, observe the fluid transportation process in the water tank and take samples in layers to measure the parameters of the fluid including viscosity, bulk density, specific gravity and sand content, and measure the flow velocity of the fluid at different positions by using a Doppler ultrasonic velocimeter; S3, after the hopper is filled with mud, the mud pump is turned off, and the circulation pump is turned on to start internal circulation. During the internal circulation process, the fluid in the water tank is sampled and analyzed at regular intervals to observe the bottom shape of the water tank and its migration process; S4, stop the internal circulation after the bottom of the water tank stabilizes, and keep still until the slurry in the water tank is completely settled; An embodiment of the present invention is that the angle of the variable slope is adjusted by the first lifting part and the second lifting part.

[0011] One implementation of the present invention is that, through the internal circulation device, the long-term interaction process of gravity flow and basement sediments and the law of bottom shape development can be observed.

[0012] Beneficial effects: The device of the present invention can simulate the gravity flow deposition experiment under multi-slope terrain conditions by setting a multi-level variable slope, which is more in line with the actual situation, so that the experimental results have a better guide for the study of the movement and deposition behavior of gravity flow under complex terrain conditions; at the same time, a circulation system is provided, which prevents the long-term injection of gravity flow slurry in a single-flow water tank from causing rapid deposition of a large amount of sediment and saves raw materials for environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the device of Example 1.

[0014] In the figure, 1 is a water tank, 2 is an overflow tank, 3 is a circulating mud pump, 4 is a mud pump, 5 is a mud tank, 6 is an agitator, 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 flow meter, and 13 is a collecting hopper. DETAILED DESCRIPTION

[0015] The specific implementation modes of the present invention will be described clearly and completely below in conjunction with examples and drawings. Obviously, the described examples are only some embodiments of the present invention, rather than all embodiments.

[0016] like Figure 1 As shown, a double variable slope internal circulation water tank simulation experimental device comprises: A water tank 1, wherein at least two levels of slope changing devices are provided in the water tank 1, and the height of the water inlet of the water tank 1 is higher than the height of the water outlet; The injection system includes a mud pump 4, the inlet end of the mud pump 4 is connected to the mud pool 5, and the outlet end is connected to the water inlet of the water tank 1; The circulation system comprises an overflow pool 2, a collecting hopper 13 is provided at the bottom of the overflow pool 2, the collecting hopper 13 is connected to the water inlet of the water tank 1 through a circulating mud pump 3, and one end of the overflow pool 2 is connected to the water inlet.

[0017] Specifically, in this embodiment, as in a conventional device, the water tank 1 is the main place for conducting the experiment, and the gravity flow slurry is settled in the water tank 1. However, compared with a conventional water tank, the difference is that at least two levels of slope changing devices are provided inside the water tank 1, for example, two levels, three levels or even four levels can be provided. In order to show the difference of this embodiment, in this embodiment, two levels of slope changing devices are provided, and the slopes of the two slope changing devices can be adjusted according to actual conditions.

[0018] In the present embodiment, a new water trough with two variable slopes inside is designed. The water trough 1 is hinged to the overflow pool 2 at the water outlet, so that the water trough 1 can rotate in the vertical direction. Of course, the hinge between the two needs to be waterproofed, such as providing a waterproof layer to prevent water or gravity flow slurry from leaking from the hinge. At the same time, similar to conventional water troughs, the water trough 1 of the present embodiment is provided with a bottom plate, which can be used 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 trough 1, and the first lifting part 8 can control the rotation of the water trough 1 by telescoping, thereby controlling the angle of the bottom plate. At the same time, the inventor also provided an inclined plate 7 in the water trough 1, one end of which is hinged to the bottom plate of the water trough 1. Similarly, a second lifting part 9 is connected to the inclined plate 7, and the second lifting part 9 can control the rotation of the inclined plate 7, thereby controlling the angle of the inclined plate 7. In the present embodiment, Figure 1 As shown, the first lifting part 8 and the second lifting part 9 are both automatically telescopic rods, wherein the first lifting part 8 is arranged on a support of the water tank.

[0019] Taking into account that in the prior art, the slopes considered in the sedimentation experiments are all downhill, therefore, for the inclined plate 7, the height of its hinged end is relatively low. 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.

[0020] 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 to the inner wall of the water tank 1. Accessories such as rubber sheets can also be set on 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 to prevent a large amount of water and gravity flow slurry from entering the lower part of the inclined plate 7.

[0021] When multiple variable slopes are provided, multiple different inclined plates 7 can be provided, and two adjacent inclined plates 7 are hinged. Those skilled in the art can also provide different ways of arranging the inclined plates 7 according to actual conditions.

[0022] The injection system is mainly used for injecting the gravity flow slurry required for the experiment, and is similar to a conventional injection system. In this embodiment, the injection system includes a mud pool 5, one end of which is connected to a mud pump 4, and the outlet end of the mud pump 4 is arranged at the water inlet of the water tank 1. In this embodiment, the water inlet of the water tank 1 is an inclined plate 7.

[0023] As for the circulation system, it includes an overflow pool 2, the inlet end of the overflow pool 2 is hinged with the outlet of the water tank 1, and the water from the water tank 1 and the gravity flow slurry will enter the overflow pool 2. At the same time, an aggregate 13 is set at the bottom of the overflow pool 2. Due to factors such as density, generally speaking, the gravity flow slurry will gradually settle and deposit in the water tank 1, but considering the influence of the settling speed, more gravity flow slurry will enter the overflow pool 2 and deposit in the aggregate hopper 13. In the prior art, either a relatively gentle single slope is set to make the gravity flow slurry settle and deposit evenly in the water tank 1, and finally more gravity flow slurry will be deposited at the end of the water tank 1, affecting the experimental results; or the gravity flow slurry is discharged as waste liquid, which is not only inconsistent with the actual situation, but also causes great waste. To this end, the inventors set up a circulation: an opening is designed at the bottom of the collecting hopper 13, the opening is connected to the inlet of the circulating mud pump 3, and the outlet of the circulating mud pump 3 is connected to the water inlet of the water tank 1.

[0024] In order to monitor the sedimentation phenomenon in real time during the whole experiment, a camera 10 is provided on the water tank 1 , and a Doppler velocimeter 11 is provided inside the water tank 1 .

[0025] The mud pool 5 is a place for setting up gravity flow slurry. However, since the composition of the gravity flow slurry is complex and the density of the materials inside it varies greatly, in order to avoid stratification of the gravity flow slurry before the experiment and affect the experimental effect, in this embodiment, an agitator 6 is provided on the mud pool 5.

[0026] A flow meter 12 is also provided between the circulating mud pump 3 and the water inlet to monitor the flow of water in the pipeline. By controlling the flow of the injected fluid, the sedimentation of different types of gravity flows can be studied.

[0027] Embodiment 2: A double-slope internal circulation water tank simulation experiment, using the device of embodiment 1, the method comprises the following steps: S1. Place the gravity flow slurry into the mud pool, measure its parameters including viscosity, bulk density, specific gravity and sand content, adjust the variable slope to the target angle, and inject water into the water tank. In this process, the angle of the variable slope can be adjusted by the first lifting part and the second lifting part.

[0028] S2. Start the mud pump and inject the gravity flow slurry into the water tank. Observe and record the fluid dynamic characteristics of the fluid in the water tank and take samples in layers to measure the parameters of the fluid including viscosity, bulk density, specific gravity and sand content. Use the Doppler ultrasonic velocimeter to measure the flow rate of the fluid at different positions.

[0029] S3. When the gravity flow slurry content in the aggregate hopper is greater than the first threshold value, the mud pump is turned off, and the circulating mud pump is turned on to start internal circulation. During the internal circulation process, the fluid in the water tank is sampled and analyzed at regular intervals to observe the bottom shape development morphology of the water tank and its migration process.

[0030] In this step, the so-called first threshold is usually judged based on actual conditions: when the gravity flow slurry content in the aggregate hopper is relatively high, and considering the difference in sedimentation and discharge rates of the gravity flow slurry, there is a certain amount of gravity flow slurry in the aggregate hopper during the entire internal circulation cycle.

[0031] At the same time, in this step, if we make an error in calculating the first threshold value, resulting in the gravity flow slurry content in the aggregate hopper being insufficient to support the circulation before the circulation is completed, in this case, we can turn on the mud pump and continue to inject a certain amount of gravity flow slurry into the water tank so that it can complete the entire circulation process.

[0032] S4. After the bottom of the water tank stabilizes, the internal circulation is stopped and the water tank remains stationary until the gravity flow slurry in the water tank is completely settled.

[0033] Throughout the experiment, the sedimentation in the flume was recorded by a video camera and a Doppler velocimeter.

[0034] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A double-slope internal circulation water tank simulation experimental device, characterized in that: include, A water trough, wherein at least two levels of slope changing devices are provided in the water trough, and the height of the water inlet of the water trough is higher than the height of the water outlet; The injection system includes a mud pump, wherein the inlet end of the mud pump is connected to the mud pool, and the outlet end of the mud pump is connected to the water inlet of the water tank; The circulation system comprises an overflow pool, a collecting hopper is arranged at the bottom of the overflow pool, the 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 connected to the water inlet.

2. The device according to claim 1, characterized in that The water outlet of the water trough is hinged to the overflow pool so that the water trough can rotate in the vertical direction around the overflow pool. The water trough is connected to a first lifting part, which controls the rotation of the water trough in the vertical direction. At least one inclined plate is provided in the water trough, and the lower end of the inclined plate is hinged to the water trough so that the inclined plate can rotate in the vertical direction. The inclined plate is connected to a second lifting part, which controls the rotation of the inclined plate in the vertical direction.

3. The device according to claim 1, characterized in that A camera is arranged on the water tank, and a Doppler velocimeter is arranged in the water tank.

4. The device according to claim 1, characterized in that The mud pool is provided with a stirrer.

5. The device according to claim 1, characterized in that A flow meter is provided between the circulating mud pump and the water inlet to monitor the flow rate inside the pipeline in real time.

6. A double-sided slope internal circulation water tank simulation test method, characterized in that: The device according to any one of claims 1 to 5 comprises the following steps: S1. Place the gravity flow slurry into the mud pool, measure its parameters including viscosity, bulk density, specific gravity and sand content, adjust the variable slope to the target angle, and inject water into the water tank; S2. Start the mud pump and inject the gravity flow slurry into the water tank, observe the fluid transportation process in the water tank and take samples in layers to measure the parameters of the fluid including viscosity, bulk density, specific gravity and sand content, and measure the flow velocity of the fluid at different positions by using a Doppler ultrasonic velocimeter; S3, when the gravity flow slurry content in the aggregate hopper is greater than the first threshold value, the mud pump is turned off, and the circulating mud pump is turned on to start internal circulation. During the internal circulation process, the fluid in the water tank is sampled and analyzed at regular intervals to observe the bottom shape development morphology and migration process of the water tank; S4. After the bottom of the water tank stabilizes, the internal circulation is stopped and the water tank remains stationary until the gravity flow slurry in the water tank is completely settled.

7. The method according to claim 6, characterized in that The angle of the variable slope is adjusted by the first lifting part and the second lifting part.

8. The method according to claim 6, characterized in that Through the internal circulation device, the long-term interaction process between gravity flow and basement sediments and the development laws of their bottom shape can be observed.

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