Device for applying high-strength seepage condition in test model box

Abstract

The utility model discloses a device for applying a high-strength seepage condition in a test model box, which comprises a model box, a first circulating water pump, a second circulating water pump and a water source tank, the interior of the model box is hollow, and two steel plates with uniform small holes are welded in the model box; the model box forms the drainage buffer chamber, the main body seepage test chamber and the water storage buffer chamber through steel plates, and a layer of permeable stone is attached to the steel plates on the inlet sides of the water drainage buffer chamber, the main body seepage test chamber and the water storage buffer chamber. The variable frequency pump is arranged to solve the problem that the high-strength seepage condition is difficult to apply, and the water pressure with the constant water level is set at the upper part of the test soil body in consideration of the adverse effect of non-horizontal seepage on the test in the seepage process, so that the vertical seepage is effectively inhibited; meanwhile, the water blocking strips are attached to the bottom and the side faces of the box body, so that water flow is effectively restrained from flowing around the interior of the box body, and the model test under the high-strength seepage condition is more reliable. Therefore, the model test under the high-strength seepage condition can be successfully carried out, and the application prospect is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering tests, in particular to a device for applying high-intensity seepage conditions in a test model box. Background Art

[0002] Seepage models are widely used in many fields of applied science and engineering technology, such as soil mechanics, groundwater hydrology, petroleum engineering, geothermal engineering, water supply engineering, environmental engineering, chemical engineering, and micro-mechanics. Before actual construction, a model test is generally conducted first. Through the test, various situations that may be encountered during the construction process and the influence of related factors on the construction results are simulated, and a more detailed construction plan is formulated. Affected by natural environmental conditions, the seepage rate of groundwater in coastal cities is relatively high, which may have an adverse effect on construction. Therefore, a model test is needed first. How to successfully simulate the high-intensity seepage of groundwater flow is a challenge faced by existing model test devices.

[0003] The existing seepage model test boxes are generally only improved according to the different test soils, and the control range of the seepage velocity is generally unable to achieve high-intensity seepage conditions. Conventional seepage model tests generally change the seepage intensity by changing the inlet head. If the high-intensity seepage conditions required by the test are to be achieved, a very high head is required, and the water tank at the inlet of the model box needs to be set very high, which is difficult to achieve. Therefore, how to successfully and effectively apply strong seepage conditions in model tests is a technical problem that needs to be solved urgently by technicians in this field. Utility Model Content

[0004] The purpose of the utility model is to provide a device for applying high-intensity seepage conditions in a test model box, so as to solve the problem proposed in the above-mentioned background technology that it can provide high-intensity seepage conditions that are easy to implement and control, and improve the model test box after considering the impact of high-intensity seepage.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for applying high-intensity seepage conditions in a test model box, comprising a model box, a first circulating water pump, a second circulating water pump and a water source tank, the interior of the model box is hollow, and two steel plates with uniform small holes are welded inside, the model box forms a drainage buffer chamber, a main seepage test chamber and a water storage buffer chamber through the steel plates, a layer of permeable stone is attached to the steel plate on the inlet side, the water storage buffer chamber is filled with crushed stone, a water divider is installed on the other side of the water storage buffer chamber, the water divider is installed with a water source tank through the first circulating water pump, the steel plate on the outlet side is attached with a geotextile, a float signaler is installed inside the drainage buffer chamber, an air-water separator is installed on the upper part of the outlet side of the drainage buffer chamber through a water ring vacuum pump, one side of the drainage buffer chamber is also connected to the water source tank through the second circulating water pump, a submersible pump is arranged in the water source tank and connected to the main seepage test chamber through a pipeline, and a pressure measuring pipe mouth is arranged in the main seepage test chamber.

[0006] Preferably, the top of the drainage buffer chamber of the model box is manufactured as one piece with the box body, the top of the main seepage chamber is open, and the top cover of the water storage buffer chamber is welded to the box body.

[0007] Preferably, a submersible pump is connected to the upper part of the test soil in the model box, an overflow device is provided on the front of the model box, and water-blocking strips are provided on the bottom and sides of the model box.

[0008] Preferably, a water ring vacuum pump is connected to the side of the drainage buffer chamber of the model box.

[0009] Preferably, the water ring vacuum pump connected to the drainage buffer chamber is equipped with an automatic control system, which includes: a float signal, a relay, and a controller. The float signal is placed on the water surface of the drainage buffer chamber, and the controller receives the water level signal from the float signal. The relay is used to convert the signal sent by the controller into a start-stop signal recognizable by the water ring vacuum pump 2.

[0010] Preferably, geotextiles are affixed to the inner walls of the left and right sides of the model box.

[0011] Preferably, pressure measuring pipe openings are arranged at equal intervals on the front of the model box, and the pressure measuring pipe openings are connected to the pressure measuring tube using a rubber hose, and the horizontal height of the pressure measuring tube is slightly higher than the model box.

[0012] Preferably, the first circulating water pump and the second circulating water pump are both equipped with a first circulating water pump control ball valve and a first flow meter and a second circulating water pump control ball valve and a second flow meter.

[0013] Preferably, both the first circulating water pump and the second circulating water pump are variable frequency pumps.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the utility model solves the problem that it is difficult to apply high-intensity seepage conditions by setting a variable frequency pump, and at the same time comprehensively considers the problems that may be encountered when applying high-intensity seepage to the mold box, and proposes effective solutions. First, due to the excessive suction of the water pump on the outlet side, the water level in the drainage buffer chamber is lower than the seepage hole on the steel plate, which will cause a part of the test soil to not be under high-intensity seepage conditions. In view of this problem, the utility model sets a vacuum pump on the outlet side of the box. When the water level does not meet the test conditions, the vacuum pump suction effect forms a vacuum, which helps to accelerate the outflow of water and speed up the rise of the water level until the test conditions are met. In addition, an automatic control system is set for the vacuum pump, which simplifies the operating procedures during the test. Secondly, considering that the existence of non-horizontal seepage during the seepage process will have an adverse effect on the test, a water pressure with a constant water level is set on the upper part of the test soil, which effectively suppresses the vertical seepage. At the same time, water blocking strips are attached to the bottom and sides of the box, which effectively suppress the bypass of water flow inside the box, making the model test under high-intensity seepage conditions more reliable. Therefore, the utility model can successfully carry out model tests under high-intensity seepage conditions and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model device;

[0016] Figure 2 This is a schematic diagram of the main structure of the model box of the utility model;

[0017] Figure 3 This is a schematic diagram of the hole distribution of the welded steel plate in the model box of the utility model.

[0018] In the figure: 1. water source tank; 2. submersible pump; 3. first circulating water pump; 301. first circulating water pump control ball valve; 302. first flow meter; 4. water distributor; 5. top cover; 6. crushed stone; 7. steel plate; 8. permeable stone; 9. model box; 10. pressure measuring pipe mouth; 11. geotextile; 12. float signal; 13. water ring vacuum pump; 14. gas-water separator; 15. second circulating water pump; 1501. second circulating water pump control ball valve; 1502. second flow meter; 16. overflow device; 17. pressure measuring pipe; 18. rubber hose. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Example 1: Please refer to Figure 1-3The utility model provides a technical solution: a device for applying high-intensity seepage conditions in a test model box, the model box 9 is hollow inside, its size is 1500mm×800mm×1000mm, the wall thickness is 5mm, and two steel plates 7 with uniform small holes are welded inside, the height of the opening range of the steel plate 7 is less than 700mm, and the aperture is 20mm. The model box 9 forms a drainage buffer chamber, a main seepage test chamber and a water storage buffer chamber through the steel plate 7. The top of the drainage buffer chamber of the model box 9 is manufactured as a whole with the box body, and the top of the main seepage chamber is open. The upper part of the test soil in the model box 9 is connected to a submersible pump 2 to continuously fill water to form water pressure, which is mainly used to suppress Control non-horizontal seepage; an overflow device 16 is provided on the front of the model box 9, and an overflow device 16 is arranged on the front of the main seepage chamber to control the water level on the top of the soil to not exceed 150mm, which is used to control the water level. Water-blocking strips are arranged on the bottom and sides of the model box 9 to increase the seepage path of water flow at the edge of the model box 9 and prevent the influence of water flow along the boundary of the model box 9 on the test seepage field. Four pressure measuring pipe openings with a diameter of 10mm are arranged at equal intervals on the front of the model box 9. A water ring vacuum pump 13 is connected to the side of the drainage buffer chamber of the model box 9 to accelerate the rise of the water level in the drainage buffer chamber, and a vacuum pump 13 is arranged at a hole at a height of 900mm on the outlet side of the drainage buffer chamber.The highest water level of the vacuum pump controller is set to 900mm, and the lowest water level is set to 700mm, so that all the drainage ports on the steel plate 7 are submerged to ensure that the seepage in the test soil is strong seepage. The top cover 5 of the water storage buffer chamber is welded to the box body. A layer of permeable stone 8 is attached to the inlet side of the steel plate 7. The thickness of the permeable stone 8 is 5mm. The water storage buffer chamber is filled with gravel 6. The drainage buffer chamber is used to ensure that water flows evenly through the test soil. The main seepage chamber is mainly used to place the test soil, and the height of the filled test soil is 800mm. The gravel 6 ensures that the water flows evenly into the box body to avoid the scouring of high-speed water flow. A water divider 4 is installed on the other side of the water storage buffer chamber. The water divider 4 is installed with a water source tank 1 through the first circulating water pump 3. The water source tank 1 is used to provide water for seepage. The first circulating water pump 3 and the second circulating water pump 15 are both equipped with a first circulating water pump control ball valve 301 and a first flow meter 302 and the second circulating water pump control ball valve 1501 and the second flow meter 1502, by controlling the corresponding ball valve opening and observing the corresponding flow meter reading to achieve precise control of the flow rate, and then accurately control the seepage speed, the two circulating water pumps are mainly used to control the flow rate of water and then control the intensity of the seepage, the first circulating water pump 3 and the second circulating water pump 15 are both variable frequency pumps, changing the opening of the corresponding ball valve, can be output stably according to the set pressure value, another side of the steel plate 7 is bonded with a geotextile 11, a float signal device 12 is installed inside the drainage buffer chamber, an air-water separator 14 is installed on the upper part of the outlet side of the drainage buffer chamber through a water ring vacuum pump, one side of the drainage buffer chamber is also connected to a water source tank 1 through the second circulating water pump 15, a submersible pump 2 is arranged in the water source tank 1 and connected to the main seepage test chamber through a pipeline, and a pressure measuring nozzle 10 is arranged in the main seepage test chamber.

[0021] Example 2: Please refer to Figure 1-3 The water ring vacuum pump 13 connected to the drainage buffer chamber is equipped with an automatic control system, which includes: a float signal 12, a relay, and a controller. The float signal 12 is placed on the water surface of the drainage buffer chamber to monitor the water level in real time; the controller receives the water level signal from the float signal 12, and sends out commands by comparing it with the preset water level value to control the start and stop of the vacuum pump; the relay is used to convert the signal sent by the controller into a start and stop signal that can be recognized by the water ring vacuum pump 13. The lower limit water level should be set higher than the highest drainage hole on the steel plate 7, and the upper limit water level should be lower than the air inlet of the vacuum pump. When the water level in the drainage buffer chamber drops to the lower limit water level, the vacuum pump starts to work; when the water level rises to the upper limit water level, the vacuum pump stops working, realizing automatic control of the vacuum pump.

[0022] Geotextiles 11 are attached to the inner walls of the left and right sides of the model box 9. Pressure measuring pipe ports 10 are set at equal intervals on the front of the model box 9. The pressure measuring pipe ports 10 are connected to the pressure measuring tube 17 using a rubber hose 18. The diameter of the rubber hose 18 is 8 mm, which is used to observe the change of water head along the seepage process. The horizontal height of the pressure measuring tube 17 is slightly higher than the model box 9 to prevent the water in the pressure measuring tube 17 from overflowing.

[0023] Example 3: Please refer to Figure 1-3 , a device for applying high-intensity seepage conditions in a test model box, the device is implemented by comprising the following steps:

[0024] Step 1: Preliminary preparation: fill the water storage buffer chamber on the far right of the model box 9 with gravel 6, then weld the top cover 5 to the box body to seal it, connect the test pipeline, confirm that all parts of the test system are connected correctly, confirm that there is no leakage in all parts of the water supply path, and ensure that all air inside the flow meter is discharged.

[0025] Step 2: Fill the sample, fill the test soil into the middle part of the model box 9 in layers, and compact it with wooden boards after each layer is filled until the height of the filled soil is higher than the opening at the highest part of the welded steel plate 7.

[0026] Step 3: Fill with water until saturated. Turn on the submersible pump 2 and slowly fill the test soil with water. When water begins to accumulate on the upper part of the soil, close the drain valve of the overflow device 16 and continue to add water to the top of the overflow port on the model box 9. Stop adding water and let it stand for 12 hours to observe whether the water level in the model box 9 drops to ensure that the test soil is completely infiltrated and saturated.

[0027] Step 4: Test operation, connect the automatic control circuit of the water ring vacuum pump 13, open the drain valve of the overflow device 16, start the submersible pump 2, start the two circulating water pumps, change the opening of the ball valve in accordance with the readings of the two flow meters, set the strong seepage conditions required for the test, observe that the readings of the flow meters are basically stable, and ensure that the test soil is in the preset strong seepage conditions. Multiple groups of tests can be carried out by changing the opening of the ball valve.

[0028] Step 5: End the test, first turn off the submersible pump 2 to stop the water supply, turn off the automatic control device of the vacuum pump, turn off the first circulating water pump 3 on the inlet side, and finally turn off the second circulating water pump 15 on the outlet side.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for applying high-intensity seepage conditions in a test model box, characterized in that: The invention comprises a model box (9), a first circulating water pump (3), a second circulating water pump (15) and a water source tank (1), characterized in that: the interior of the model box (9) is hollow, and two steel plates (7) with uniform small holes are welded inside; the model box (9) forms a drainage buffer chamber, a main seepage test chamber and a water storage buffer chamber through the steel plates (7); a layer of permeable stone (8) is attached to the steel plate (7) on the inlet side; the water storage buffer chamber is filled with crushed stones (6); a water distributor (4) is installed on the other side of the water storage buffer chamber; the water distributor (4) is connected to the first The circulating water pump (3) is installed with a water source tank (1), and a geotextile (11) is attached to the steel plate (7) on the outlet side. A float signal device (12) is installed inside the drainage buffer chamber. An air-water separator (14) is installed on the upper part of the outlet side of the drainage buffer chamber through a water ring vacuum pump. One side of the drainage buffer chamber is also connected to the water source tank (1) through a second circulating water pump (15). A submersible pump (2) is arranged in the water source tank (1) and is connected to the main seepage test chamber through a pipeline. A pressure measuring pipe port (10) is arranged in the main seepage test chamber.

2. The device for applying high-intensity seepage conditions in a test model box according to claim 1, characterized in that: The top of the drainage buffer chamber of the model box (9) is manufactured as a whole with the box body, the top of the main seepage chamber is open, and the water storage buffer chamber top cover (5) is welded to the box body.

3. The device for applying high-intensity seepage conditions in a test model box according to claim 1, characterized in that: A submersible pump (2) is connected to the upper part of the test soil in the model box (9), an overflow device (16) is provided on the front of the model box (9), and water blocking strips are provided on the bottom and side surfaces of the model box (9).

4. The device for applying high-intensity seepage conditions in a test model box according to claim 1, characterized in that: A water ring vacuum pump (13) is connected to the side of the drainage buffer chamber of the model box (9).

5. The device for applying high-intensity seepage conditions in a test model box according to claim 1, characterized in that: The water ring vacuum pump (13) connected to the drainage buffer chamber is equipped with an automatic control system, which includes: a float signal device (12), a relay, and a controller. The float signal device (12) is placed on the water surface of the drainage buffer chamber. The controller receives the water level signal transmitted by the float signal device (12). The relay is used to convert the signal sent by the controller into a start-stop signal that can be recognized by the water ring vacuum pump (13).

6. The device for applying high-intensity seepage conditions in a test model box according to claim 1, characterized in that: Geotextiles (11) are attached to the inner walls of the box on both sides of the model box (9).

7. The device for applying high-intensity seepage conditions in a test model box according to claim 1, characterized in that: The front of the model box (9) is provided with pressure measuring pipe openings (10) at equal intervals. The pressure measuring pipe openings (10) are connected to a pressure measuring tube (17) using a rubber hose (18). The horizontal height of the pressure measuring tube (17) is slightly higher than the model box (9).

8. The device for applying high-intensity seepage conditions in a test model box according to claim 1, characterized in that: The first circulating water pump (3) and the second circulating water pump (15) are both equipped with a first circulating water pump control ball valve (301) and a first flow meter (302) as well as a second circulating water pump control ball valve (1501) and a second flow meter (1502).

9. The device for applying high-intensity seepage conditions in a test model box according to claim 1, characterized in that: The first circulating water pump (3) and the second circulating water pump (15) are both variable frequency pumps.

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