Experimental device for anti-erosion performance of buffer backfill material

Abstract

The application discloses an experimental device for testing the anti-erosion performance of backfill materials to water flow. The device comprises a shell and a sealing shell with test liquid inflow or outflow channels respectively, and an inner core assembly arranged in the shell and the sealing shell and having an outer diameter smaller than the inner diameter of the shell and the sealing shell. A sealing device is arranged between the shell and the sealing shell, and a tail end of a sample sleeve is provided with a flow channel connected with the liquid channel of the shell. The device can be used for vertical erosion experiments, and can also be used for erosion experiments at different angles by changing the angle of the pipe joint. The device has the advantages of small volume, easy assembly, repeated use, and good application prospect.

Description

Technical Field

[0001] This invention relates to an experimental apparatus, specifically an experimental apparatus for testing the erosion resistance of backfill materials to water flow. Background Technology

[0002] For repositories storing high-level radioactive waste, especially those storing it for extended periods, compacted buffer backfill materials serve as essential artificial barriers. Their resistance to water erosion is one of the key performance indicators of compacted buffer backfill materials. Existing testing methods, such as immersion tests, cannot simulate the erosive effects of groundwater on backfill materials under real-world conditions. Summary of the Invention

[0003] This invention provides an experimental device that can solve problems that existing technologies cannot address, and can be used to test the erosion resistance of backfill materials to vertical water flow.

[0004] The erosion resistance test apparatus for buffer backfill materials of the present invention includes: a shell and a cover, each with a channel for the inflow or outflow of test liquid; and an inner core assembly, consisting of a sample sleeve, a sample spring pusher plate, and a mesh sample pad, placed inside the shell and cover with an outer diameter smaller than the inner diameter of the shell and cover. A sealing device is provided between the shell and cover, and a flow channel connecting the sample sleeve to the liquid channel in the shell is provided at the tail end of the sample sleeve. During testing, the mesh sample pad is placed at the inlet of the test liquid channel, and the test sample is placed inside the sample sleeve with one end behind the mesh sample pad and the other end in front of the pusher plate. The pusher plate and spring inside the sample sleeve provide support for the test sample, pressing it tightly against the mesh sample pad. Simultaneously, the pusher spring inside the sample sleeve can change the pressure, providing space for the swelling of the test sample upon contact with water. Because the outer diameter of the sample sleeve is smaller than the inner diameter of the shell, a liquid flow path is formed between the sample sleeve and the shell. The test water flows directly onto the sample through the liquid channel and the mesh structure of the sample pad, forming an erosion effect, and is discharged from the other end of the liquid channel through the liquid flow path and flow channel formed by the diameter difference.

[0005] Preferably, the experimental device for testing the erosion resistance of the buffer backfill material of the present invention has threaded connection sections in the liquid channels of the shell and the sealing shell respectively. This structure can be easily connected to the pipeline with threaded joints during the test, and the operation is simple and the connection is reliable.

[0006] Preferably, in the experimental apparatus for testing the erosion resistance of the buffer backfill material of the present invention, the fastening device for fixing the connecting shell and the sealing shell is a threaded hole and a connecting bolt provided on the shell or the sealing shell; or, it can be a flange with bolt holes provided on the shell and the sealing shell respectively, and a connecting bolt and nut for fixing the flange.

[0007] Preferably, in the erosion resistance test apparatus for the buffer backfill material of the present invention, the sealing device between the shell and the cover is a sealing gasket or a sealing O-ring.

[0008] The fastening connection device and sealing device described above in this invention are simpler and more reliable.

[0009] Preferably, the sample push plate of the test device for the erosion resistance of the buffer backfill material of the present invention is provided with a concave ring structure for placing an O-ring seal. The device has an O-ring seal that matches the concave ring structure, which can prevent the test liquid from directly acting on the thrust spring and causing corrosion to the spring.

[0010] More preferably, the inner wall of the housing of the experimental apparatus for testing the erosion resistance of the buffer backfill material of the present invention is provided with a slot, and the tail end of the sample sleeve is provided with a fixing foot that can be inserted into the slot in the inner wall of the housing. During the test, the fixing foot at the tail end of the sample sleeve is inserted into the slot in the inner wall of the housing, which completely avoids the problem of the sample sleeve rotating during the test.

[0011] More preferably, in the erosion resistance test device for the buffer backfill material of the present invention, the test liquid inflow channel is connected to the shell or the sealing shell by a rotatable pipe joint, so that the erosion test of the sample at different angles can be achieved by changing the angle of the water flow channel during the test.

[0012] The beneficial effects of this invention are: 1. This invention can perform vertical erosion experiments, and subsequent changes in the pipe joint angle can be used to perform erosion experiments at different angles, making the experiment more consistent with the interface between natural cracks and buffer backfill material.

[0013] 2. The device is small in size, easy to assemble, and can be conveniently placed in a glove box to study the erosion resistance of calcium-based buffer backfill materials. 3. The device can be reused repeatedly, and O-rings are used to seal key parts, avoiding the risk of leakage during long-term experiments.

[0014] 4. The application of the device of this invention is expected to expand the research direction of erosion resistance of buffer backfill materials, provide a stable and reliable experimental platform for this type of research, and has good application prospects. Attached Figure Description

[0015] Figure 1This is a schematic diagram of a structure according to an embodiment of the present invention. In the figure: 1. Sealing shell; 2. Housing; 3. Sample sleeve; 4. Sample push plate; 5. Mesh sample pad; 6. Test sample; 7. O-ring with concave ring structure on the sample push plate; 9. Fixing foot of sample sleeve; 10. Liquid inlet channel with standard threaded inlet; 11. Standard threaded liquid outlet channel with standard threaded outlet; 12. Leak-proof sealing O-ring between housing 2 and sealing shell 1; 13. Fastening bolt; 14. Schematic diagram of liquid flow path. Implementation

[0016] The present invention will be explained in detail with reference to the accompanying drawings and embodiments.

[0017] See Figure 1 This is a schematic diagram of an embodiment of the present invention in a test state. The device of this embodiment includes a sealed shell 1 with an inlet channel having a standard threaded inlet port 10 and a housing 2 with a standard threaded outlet port 11. A sample sleeve 3, with an outer diameter smaller than the inner diameter of the housing 2 and the sealed shell 1, is disposed within the housing 2 and the sealed shell 1. A fixing foot 9 is provided at the tail end of the sample sleeve 3, which can be inserted into a slot at the bottom of the housing 2 to restrain the rotation of the sample sleeve 3 during the test. A sample pad 5 with a mesh structure is disposed after the inlet channel. The present invention recommends using a sintered stainless steel mesh as the sample pad, as it has high mechanical strength, is easy to clean, corrosion-resistant, and has a stable mesh shape. The buffer backfill material sample 6 to be tested is placed after the sample pad 5. Figure 1 As can be seen, sample 6 is placed inside sample sleeve 3, with its rear end in contact with sample push plate 4. Thrust spring 8 acts on the bottom of sample push plate 4. The sealing shell 1 and housing 2 are joined by bolts 13 passing through bolt holes on housing 2 and acting on threaded holes on sealing shell 1. A leak-proof O-ring 12 placed between housing 2 and sealing shell 1 seals the test liquid within the device.

[0018] During testing, the apparatus of this invention provides support for the test sample 6 at one end via the sample pusher plate 5, and at the other end via the sample pusher plate 6 and spring 8, pressing the sample tightly against the mesh-structured sample pad. Simultaneously, the thrust spring inside the sample sleeve can change the pressure, providing space for the sample to swell upon contact with water. Since the outer diameter of the sample sleeve is smaller than the inner diameter of the shell, a liquid flow path is formed between the sample sleeve and the shell (see diagram 14). During testing, the test water flows directly onto the sample through the liquid channel and the mesh-structured sample pad, creating an erosion effect, and is discharged from the liquid passage 11 at the other end through the liquid flow path and channel formed by the diameter difference shown in diagram 14.

[0019] Figure 1This is one embodiment of the present invention, wherein the test liquid inlet channel is located at the sealing shell 1, but the test liquid inlet channel can also be placed at the shell 2, thus forming another embodiment of the present invention.

[0020] If the inlet channel is connected to the shell or enclosure using a rotatable pipe joint structure, the specific rotatable pipe joint structure can be found in Chinese patents CN2022221292368, 202223021065, or 202222765038, thus forming another embodiment of the present invention. These embodiments allow for erosion experiments at different angles by changing the angle between the inlet jet and the test sample. This enables the relevant experiments to simulate the interface between natural cracks and buffer backfill materials to the greatest extent possible, resulting in more objective experimental results.

Claims

1. A test apparatus for the erosion resistance of buffer backfill materials, characterized in that... The experimental apparatus includes a shell and a cover, each with a channel for the test liquid to flow in or out. An inner core assembly, consisting of a sample sleeve, a sample spring pusher plate, and a mesh sample pad, is placed inside the shell and cover. The outer diameter of the sample sleeve is smaller than the inner diameter of the shell and cover, thus creating a flow path for the liquid between the outer wall of the sleeve and the inner wall of the shell. A sealing device and a fastening device are provided between the shell and cover. A flow channel connecting the sample sleeve to the liquid channel in the shell is provided at the tail end of the sample sleeve. During the experiment, the test sample is placed inside the sample sleeve with one end behind the mesh sample pad and the other end in front of the pusher plate. A pusher spring acts on the bottom of the pusher plate, providing support for the test sample and pressing it tightly against the mesh sample pad. Simultaneously, the pusher spring inside the sample sleeve can change the pressure, providing space for the sample to swell upon contact with water. The test liquid inflow channel is connected to the shell or cover using a rotatable pipe joint.

2. The experimental apparatus for testing the erosion resistance of buffer backfill materials according to claim 1, characterized in that... Threaded connection sections are provided at the liquid channels of the shell and the cover, respectively.

3. The experimental apparatus for testing the erosion resistance of buffer backfill materials according to claim 2, characterized in that... The fastening device between the housing and the cover is a threaded hole and a connecting bolt provided on the housing and the cover.

4. The experimental apparatus for testing the erosion resistance of buffer backfill materials according to claim 2, characterized in that... The fastening devices between the housing and the cover are bolt holes and connecting bolts and nuts respectively provided on the housing and the cover.

5. The experimental apparatus for testing the erosion resistance of buffer backfill materials according to claim 2, 3, or 4, characterized in that... The sealing device between the housing and the cover is a gasket or an O-ring.

6. The experimental apparatus for testing the erosion resistance of buffer backfill materials according to claim 5, characterized in that... The sample pusher plate is provided with a concave ring structure for placing a sealing O-ring, and a sealing O-ring that mates with the concave ring structure.

7. The experimental apparatus for testing the erosion resistance of buffer backfill materials according to claim 6, characterized in that... The inner wall of the housing is provided with slots, and the tail end of the sample sleeve has a fixing foot that can be inserted into the slots in the inner wall of the housing.

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