CN107576605B - Single-crack solute migration test device released by line source and application method thereof - Google Patents
Single-crack solute migration test device released by line source and application method thereof Download PDFInfo
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- CN107576605B CN107576605B CN201710985936.8A CN201710985936A CN107576605B CN 107576605 B CN107576605 B CN 107576605B CN 201710985936 A CN201710985936 A CN 201710985936A CN 107576605 B CN107576605 B CN 107576605B
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- 238000012360 testing method Methods 0.000 title claims abstract description 77
- 230000005012 migration Effects 0.000 title claims abstract description 17
- 238000013508 migration Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000011435 rock Substances 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims description 24
- 229920001971 elastomer Polymers 0.000 claims description 17
- 230000002572 peristaltic effect Effects 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 230000035515 penetration Effects 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000009738 saturating Methods 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 6
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- 230000007547 defect Effects 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 2
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
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- 238000011088 calibration curve Methods 0.000 description 2
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- SGHZXLIDFTYFHQ-UHFFFAOYSA-L Brilliant Blue Chemical compound [Na+].[Na+].C=1C=C(C(=C2C=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C=2C(=CC=CC=2)S([O-])(=O)=O)C=CC=1N(CC)CC1=CC=CC(S([O-])(=O)=O)=C1 SGHZXLIDFTYFHQ-UHFFFAOYSA-L 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a single-crack solute migration test device released by a line source and a use method thereof, and belongs to the technical field of groundwater environment protection. The device comprises a fixing and adjusting component, a water inlet and outlet connecting piece, a line source control valve and a rock fracture test piece. The device can realize the purpose of releasing the line source of the tracer in the single-crack rock by designing a special line source control valve, and overcomes the defect of a point source release test. The liquid storage cavity of the water inlet connecting piece of the device provides a simple, convenient and effective method for injecting, mixing and releasing the tracer solution. The device not only can carry out migration tests of water-soluble pollutants, but also can carry out two-phase flow tests of water vapor, water oil and the like.
Description
Technical Field
The invention relates to the technical field of groundwater environment protection, in particular to a test simulation device for indoor simulating migration of pollutants in groundwater of a groundwater rock fracture medium in a line source mode and a use method thereof, which are test equipment for groundwater pollution or repair research.
Background
Engineering and environmental fields such as groundwater pollution, nuclear waste geological treatment, CO 2 geological sequestration and the like relate to a fissure medium solute transport process, and are one of hot spots and difficult problems for research in recent decades. Because of the complexity and randomness of the crack geometric features in the nature, the solute transport mechanism in the rough single crack is quite complex, and a physical model test is one of important means for researching the pollutant migration in the crack medium.
At present, most of domestic single-fracture solute migration tests adopt a point source injection method, namely pollutants or tracers are injected into the inside of a fracture through small holes at the inlet end, and the pollutants are mainly migrated and diffused through a priority channel. Studies have shown that the region of smaller gap width in rough cracks is one of the important reasons for tailing of solute transport penetration curves. The effect of these regions on solute transport cannot be reflected by the method of point source injection. Therefore, a method of injecting the tracer through the line source is needed to comprehensively and truly reflect the influence of the overall geometric configuration of the fracture on the solute transport process.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention provides a single-crack solute migration test simulation device capable of realizing the release of a tracer by a line source. The specific technical scheme is as follows:
A single-crack solute migration test device released by a line source comprises a fixing and adjusting component, a water inlet and outlet connecting piece, a line source control valve and a rock crack test piece;
The fixing and adjusting component comprises a test piece fixing frame, a valve adjusting handle and a side adjusting clamping plate; the main function of the fixing and adjusting component is to fix the crack test piece, and make the crack test piece and the water inlet and outlet connecting piece connected in a seamless way, and simultaneously assist in realizing the opening and closing operation of the line source control valve.
The water inlet and outlet connecting piece comprises a water inlet connecting piece and a water outlet connecting piece; the water inlet connecting piece comprises a liquid storage cavity, a vent hole, an outer joint, a water inlet sealing rubber plate and a water inlet pipe; the liquid storage cavity is communicated with the vent hole and the water inlet pipe; the outer joint is connected with the vent hole; the water outlet connecting piece comprises a water outlet pipe and a water outlet sealing rubber plate;
the line source control valve comprises a strip-shaped stainless steel sheet, a valve sealing rubber strip, an adjusting screw and a hand-screwed nut; the valve sealing rubber strip is adhered to the surface of the strip-shaped stainless steel sheet;
the main functions of the strip-shaped stainless steel sheet and the sealing rubber strip of the line source control valve are that under the condition of closing the valve, the water inlet of the crack is sealed, and the adjusting screw and the hand-screwed nut are used for realizing the opening and closing actions of the valve.
The rock fracture test piece includes a fracture and a rock body.
Preferably, the test piece fixing frame and the valve adjusting handle are manufactured by processing aluminum alloy or stainless steel materials.
Preferably, the main body of the water inlet and outlet connecting piece is made of organic glass materials.
Preferably, the rock fracture test piece is made of rock material containing horizontal fractures.
The invention also provides a test method of the single-crack solute transport test simulation device for the line source release tracer, which specifically comprises the following steps:
step 1: manufacturing a rock single-crack test piece conforming to the size, fixing and sealing the test piece in a device metal frame, and horizontally placing a test device;
step 2: slowly injecting pure water into the cracks through a peristaltic pump, checking whether the device leaks water, sealing the leaking points, and completely saturating the cracks by using a vacuum pump to pump the bubbles if the cracks contain bubbles;
Step 3: closing a slit water outlet valve and a line source control valve in a water inlet liquid storage cavity, opening a vent hole at the top of the cavity, and pumping out water in the cavity;
step 4: filling the liquid storage cavity with a tracer solution through a peristaltic pump, and discharging the redundant solution from the vent hole;
step 5: closing the vent hole, opening a crack water inlet line source control valve, starting a line source release tracing test, and starting timing by using a timer;
Step6: sampling at the water outlet according to the test design time interval, numbering according to the sequence, and placing;
Step 7: measuring the concentration of the tracer in the water sample by using a spectrophotometer and other instruments, and drawing a tracer concentration penetration curve;
Step 8: after the test is finished, pure water is used for continuously flushing the cracks for 24 hours so as to remove residual solutes in the cracks;
Step 9: and (5) regulating the rotating speed of the peristaltic pump, repeating the steps, and performing the next test.
The beneficial effects are that:
1. The invention not only can carry out migration test of water-soluble pollutants, but also can carry out two-phase flow test of water vapor, water oil and the like.
2. According to the invention, by designing the special line source control valve, the line source release purpose of the tracer in the single rock crack can be realized, and the defect of a point source release test is overcome.
3. The liquid storage cavity of the water inlet connecting piece provides a simple, convenient and effective method for injecting, mixing and releasing the tracer solution.
Drawings
Fig. 1 is a three-dimensional block diagram of the present invention.
Fig. 2 is a side view of the structure of the present invention.
FIG. 3 is a schematic view of the line source control valve of the present invention disassembled from the water inlet connection.
FIG. 4 is a graph of solute transport penetration plotted from a shale fracture test using the apparatus of the present invention.
The device comprises a fixing and adjusting component 1, a water inlet connecting piece 2a, a water outlet connecting piece 2b, a line source control valve 3, a crack test piece 4, a test piece fixing frame 5, a valve adjusting handle 6, a side adjusting clamping plate 7, a liquid storage cavity 8, a vent hole 9, an external joint 10, a water inlet sealing rubber plate 11, a water inlet pipe 12, a water outlet pipe 13, a water outlet sealing rubber plate 14, a strip-shaped stainless steel sheet 15, a valve sealing rubber strip 16, an adjusting screw 17, a rubber sealing ring 18, a hand screw nut 19, a crack 20 and a rock body 21.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 3, the crack solute migration test device of the present invention comprises a fixing and adjusting member 1, a water inlet and outlet connector 2a, a line source control valve 3 and a rock crack test piece 4.
The specimen fixing frame 5 is manufactured by processing stainless steel plates or aluminum alloy plates with the thickness of about 1cm, the internal dimension of the frame is 17cm multiplied by 20cm, and the dimension of the frame can be designed according to the required dimension of the crack specimen.
The main body of the water inlet and outlet connecting piece 2b can be manufactured by processing organic glass materials. The whole size of the water inlet connector is 17cm multiplied by 2.8cm multiplied by 5cm (length multiplied by width multiplied by height), and a cubic space of 17cm multiplied by 1.8cm multiplied by 2cm is hollowed out to serve as a liquid storage cavity 8. The overall size of the water outlet connector is 17cm multiplied by 1.8cm multiplied by 5cm (length multiplied by width multiplied by height), and 5-7 water outlet holes with the diameter of 4mm are uniformly arranged on the water outlet connector.
The fracture test piece takes shale rock with the thickness of about 5cm as a raw material, and a cuboid test piece with the size of 15cm multiplied by 15cm is manufactured after the fracture is split along the vertical thickness direction.
The joint part of the crack test piece and the water inlet and outlet connecting piece is sealed by sealing rubber plates 11 and 14 with the thickness of 2mm, so that leakage is prevented. And two sides of the crack test piece are close to the fixed frame, and side adjusting clamping plates 7 with the thickness of 1cm are arranged to prevent the test piece from loosening.
The test device is installed in the following process: step 1, firstly, the strip-shaped steel sheet end of the line source control valve is placed into a liquid storage cavity 8 in the water inlet connecting piece, as shown in fig. 3, the part of the adjusting screw 17 penetrating through the connecting piece 2a is sealed by a rubber sealing ring 18, liquid leakage in the liquid storage cavity is prevented, and a hand-screwed nut 19 and a valve adjusting handle 6 are sequentially installed. Step 2, a water outlet connector 2b and a water outlet pipe 13 are installed. And step 3, sealing the side surface of the rock fracture test piece, then loading the rock fracture test piece into a test device, fixing the position of the test piece by using an adjusting clamping plate 7, and sealing the connecting part of the test piece and the water inlet and outlet connecting piece by using a rubber plate.
The invention will now be further described in connection with a shale intra-fracture solute transport testing method.
The whole test device is horizontally arranged on a test platform, and the test system supplies water or tracer solution by using a peristaltic pump, adjusts the rotating speed of the peristaltic pump and controls the flow rate of the crack water flow.
And (3) filling water into the cracks by using a peristaltic pump, checking whether the sealing part of the device is sealed well, and sealing by using glass cement if water leakage points exist. After the tightness of the device is checked to be perfect, bubbles in water are pumped by using a vacuum pump, so that the inside of the crack is completely filled with water to reach a saturated state.
Before the tracing test, a standard tracer solution is prepared, a brilliant blue dye solution (NaCl solution or other solution can be used) is used as the tracer, the absorbance of the standard solution is measured by an ultraviolet spectrophotometer, and a calibration curve of absorbance and concentration is established.
The water inlet end line source control valve 3 is closed, water in the liquid storage cavity 8 is pumped out through the outer joint 10, and the tracer solution is filled into the liquid storage cavity.
The peristaltic pump is started and kept running at 2rpm, meanwhile, the water inlet end line source control valve 3 is opened, and the crack line source tracing test is started.
When the test starts, a timer is used for timing, a small test tube is used for taking water samples at the water outlet every 2min, and the water samples are uniformly placed after being numbered according to the time sequence.
Shale fracture solute migration tests are completed after 2 hours. The duration of the test can be determined based on the fracture volume and fracture flow, the flow can be determined before or after the test, and the fracture outlet flow is 0.21mL/s at a peristaltic pump speed of 2 rpm.
And measuring the absorbance of the tracer in the water sample at the water outlet one by one according to the numbering sequence by using a spectrophotometer, calculating the concentration of the tracer according to an absorbance-concentration calibration curve, normalizing the concentration value to obtain the relative concentration, and finally drawing a shale fracture solute migration penetration curve as shown in figure 4.
The shale fracture solute migration test result shows that under the condition that the shale fracture flow is 0.21mL/s, the solute concentration of a fracture water outlet is continuously increased along with time in the early stage, the later stage tends to be stable, and the penetration curve trend accords with the general rule of the solute migration test. After the test is carried out for 10min, the solute penetrates the crack for the first time, and then the solute concentration at the water outlet of the crack increases faster, which indicates that the solute migrates rapidly in the crack through the preferential channel. In the interval of 40min to 60min, the increasing speed of the solute concentration is slowed down, after 60min of test, the change of the solute concentration is smaller, the overall trend is continuously close to the maximum value, and a certain tailing phenomenon exists, which is mainly caused by the fact that a water flow 'motionless area' is formed in a region with small gap width in a crack, so that the tailing of a solute migration penetration curve is caused.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (3)
1. A single crack solute migration test device released by a line source is characterized in that: comprises a fixing and adjusting component (1), a water inlet and outlet connecting piece (2), a line source control valve (3) and a rock fracture test piece (4);
The fixing and adjusting component (1) comprises a test piece fixing frame (5), a valve adjusting handle (6) and a side adjusting clamping plate (7);
The water inlet and outlet connecting piece (2) comprises a water inlet connecting piece (2 a) and a water outlet connecting piece (2 b); the water inlet connecting piece (2 a) comprises a liquid storage cavity (8), a vent hole (9), an outer joint (10), a water inlet sealing rubber plate (11) and a water inlet pipe (12); the liquid storage cavity (8) is communicated with the vent hole (9) and the water inlet pipe (12); the outer joint (10) is connected with the vent hole (9); the water outlet connecting piece (2 b) comprises a water outlet pipe (13) and a water outlet sealing rubber plate (14);
the line source control valve (3) comprises a strip-shaped stainless steel sheet (15), a valve sealing rubber strip (16), an adjusting screw (17) and a hand-screwed nut (19); the valve sealing rubber strip (16) is adhered to the surface of the strip-shaped stainless steel sheet (15);
The part of the adjusting screw (17) penetrating through the water inlet connecting piece (2 a) is sealed by a rubber sealing ring (18), so that liquid leakage in the liquid storage cavity is prevented, and a hand-screwed nut 19 and a valve adjusting handle 6 are sequentially arranged;
the main body part of the water inlet and outlet connecting piece (2) is made of organic glass materials;
The test piece fixing frame (5) and the valve adjusting handle (6) are made of aluminum alloy or stainless steel materials;
the rock fracture test piece (4) comprises a fracture (20) and a rock body (21).
2. A single-slit solute transport testing device for line-source release as defined in claim 1, wherein: the rock fracture test piece (4) is made of rock materials containing horizontal fractures.
3. A method of using a single-slit solute transport testing device released by any one of the line sources of claims 1-2, comprising the steps of:
(1): manufacturing a rock single-crack test piece conforming to the size, fixing and sealing the test piece in a device metal frame, and horizontally placing a test device;
(2): slowly injecting pure water into the cracks through a peristaltic pump, checking whether the device leaks water, sealing the leaking points, and completely saturating the cracks by using a vacuum pump to pump the bubbles if the cracks contain bubbles;
(3): closing a slit water outlet valve and a line source control valve in a water inlet liquid storage cavity, opening a vent hole at the top of the cavity, and pumping out water in the cavity;
(4): filling the liquid storage cavity with a tracer solution through a peristaltic pump, and discharging the redundant solution from the vent hole;
(5): closing the vent hole, opening a crack water inlet line source control valve, starting a line source release tracing test, and starting timing by using a timer;
(6): sampling at the water outlet according to the test design time interval, numbering according to the sequence, and placing;
(7): measuring the concentration of the tracer in the water sample by using a spectrophotometer instrument, and drawing a tracer concentration penetration curve;
(8): after the test is finished, pure water is used for continuously flushing the cracks for 24 hours so as to remove residual solutes in the cracks;
(9): and (5) regulating the rotating speed of the peristaltic pump, repeating the steps, and performing the next test.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710985936.8A CN107576605B (en) | 2017-10-20 | 2017-10-20 | Single-crack solute migration test device released by line source and application method thereof |
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| CN201710985936.8A CN107576605B (en) | 2017-10-20 | 2017-10-20 | Single-crack solute migration test device released by line source and application method thereof |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108759949B (en) * | 2018-05-30 | 2020-08-11 | 河海大学 | Device for measuring groundwater outflow of shallow water area and operation method thereof |
| CN109856153A (en) * | 2018-12-06 | 2019-06-07 | 河海大学 | A kind of visual experimental apparatus and its experimental method of Single Fracture medium pollution object transition process |
| CN113702246B (en) * | 2021-08-25 | 2023-02-03 | 河海大学 | Monitoring device and monitoring method for pollutant migration in filling fracture network |
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