Karst surface collapse simulation test device

Abstract

The utility model provides a karst surface collapse simulation test device, which relates to the technical field of karst surface collapse simulation and comprises a bottom plate, a glass cover, a spray pipe and a placing plate, a fixing plate and a support are fixed on the bottom plate, the placing plate is fixed on the bottom plate through the fixing plate, a karst surface sample is fixed on the placing plate, and the support is fixed on the bottom plate. A pressure detection disc is fixed to the top of the air cylinder, an elastic piece is arranged on the pressure detection disc, a supporting disc is fixed to the top end of the elastic piece, the glass cover is inserted into the bottom plate, a glass groove is formed in the glass cover, the bottom end of the spraying pipe penetrates through the glass cover and extends into the glass groove, and a spraying head is installed at the bottom end of the spraying pipe. The utility model has the beneficial effects that the simulation test device can accurately detect whether the karst ground with different rainfall collapses or not according to the pressure value detected by the pressure detection disc by introducing water with different flows into the spraying pipe. The simulation test device has the advantages of being simple in structure and convenient to operate.

Description

Technical Field

[0001] This utility model relates to the field of karst ground collapse simulation technology, specifically a karst ground collapse simulation test device. Background Technology

[0002] Karst landforms refer to surface features formed by dissolution, typically found in areas of soluble rocks such as limestone and dolomite. Over millions of years, groundwater erosion, dissolution, and material migration have created various unique landforms on the surface or underground, including caves, cliffs, canyons, pillars, karst depressions, and dry riverbeds. Because karst landforms have a hollow bottom structure, they are prone to collapse under rainfall conditions. To study the collapse process of karst landforms, it is necessary to accurately detect whether they collapse under different rainfall conditions using collapse simulation testing devices.

[0003] Existing karst collapse simulation test devices typically simulate rainfall by spraying water through sprinkler pipes. During this process, the spray volume is continuously increased until a karst surface sample is observed to crack, thus determining the maximum rainfall required to cause the karst surface to crack. For example, a Chinese patent discloses a test device for simulating karst surface collapse (authorization announcement number CN219758248U). This patented technology mainly includes a geological body model box. A first water supply mechanism and a second water supply mechanism are connected to opposite sides of the geological body model box. A metering component is installed inside the geological body model box. A karst channel is fixedly connected to and connected to the center of the bottom surface of the geological body model box. The karst channel is vertically arranged and equipped with a third valve and a fourth valve. The fourth valve is located at the bottom of the karst channel, and the third valve is located at the top of the karst channel. A mud and sand collection device is installed below the karst channel, and the karst channel is connected to a karst water system.

[0004] However, this patent still has shortcomings. Because the amount of water sprayed is constantly changing and the moment when the karst ground sample just cracks is difficult to determine immediately, it cannot accurately detect the amount of simulated rainfall that caused the collapse. The accuracy of the test results is difficult to meet the experimental requirements. Utility Model Content

[0005] In view of this, in order to accurately simulate whether karst ground will collapse under different rainfall conditions, this utility model provides a karst ground collapse simulation test device; including a base plate, an experimental cover, a spray pipe and a placement plate;

[0006] The placement plate is fixed to the top of the base plate by two fixing plates. The placement plate is provided with a through groove. The karst ground sample to be tested is supported on the placement plate and the karst ground sample is located above the through groove.

[0007] The base plate is also provided with a bracket, on which a pressure detection plate is fixedly mounted. A support plate is provided above the pressure detection plate, and the support plate is supported on the pressure detection plate by an elastic element. The support plate is attached to the lower surface of the karst ground sample.

[0008] The experimental hood is supported on the base plate and covers the placement plate and bracket inside it. The lower end of the spray pipe is connected to a nozzle, which is located directly above the karst ground sample. The upper end of the spray pipe extends through the experimental hood to the outside of the experimental hood.

[0009] Furthermore, a groove is provided on the bracket, and a cylinder is fixed in the groove. The telescopic rod of the cylinder extends through the bracket to the outside of the bracket. A disc is fixed at the top of the telescopic rod, and the pressure detection disc is fixed on the disc.

[0010] Furthermore, four rollers arranged in a rectangular array are fixed on the lower surface of the base plate.

[0011] Furthermore, a handle is fixed to one side of the base plate.

[0012] Furthermore, a circular hole is provided at the top of the inner wall of the groove, and the top of the cylinder's telescopic rod passes through the circular hole.

[0013] Furthermore, the experimental enclosure is a transparent glass enclosure.

[0014] Furthermore, a pressure LCD screen is installed on one side of the glass cover, and a control switch box is fixed on one side of the glass cover. A display screen and buttons are sequentially fitted and installed on one side of the control switch box from top to bottom.

[0015] Furthermore, the upper surface of the glass cover is provided with mounting holes, the spray pipe passes through the mounting holes and is fixed in the mounting holes, and two handles are fixed on both sides of the upper surface of the glass cover respectively. The upper end of the spray pipe is used to connect a water supply device.

[0016] Furthermore, a slot is provided on the upper surface of the base plate, and the bottom end of the glass cover is inserted into the slot.

[0017] Furthermore, the nozzle has a circular disc structure, and multiple spray holes are distributed on the lower surface of the nozzle.

[0018] The beneficial effects of this utility model's karst ground collapse simulation test device are as follows: The simulation test device uses a placement plate to fix a karst ground sample. A support is fixed to the upper surface of the base plate, and a groove is opened at the front end of the support. A cylinder is fixed to the top of the inner wall of the groove, and a disc is fixed to the top of the cylinder's telescopic rod. A pressure detection disc is fixed to the upper surface of the disc, and an elastic element is fixed to the upper surface of the pressure detection disc. A support disc is fixed to the top of the elastic element. A glass cover is inserted into the base plate, and a glass groove is opened on the lower surface of the glass cover. The bottom end of a spray pipe penetrates the glass cover and extends into the glass groove, with a nozzle installed at the bottom end of the spray pipe. When a karst ground collapse simulation test is needed, the karst ground sample is placed on the upper surface of the placement plate, and then the cylinder is activated, causing the telescopic rod to extend and retract. The support disc fits against the lower surface of the karst ground sample, and then the glass cover is inserted into the groove. A fixed amount of water is introduced into the spray pipe and then sprayed out through the nozzle. The pressure value detected by the pressure detection disc can accurately detect whether the karst ground has collapsed under a certain rainfall. By adjusting the water flow in the spray pipe, it is possible to detect whether the karst ground has collapsed under different rainfall. This simulation test device has the advantages of simple structure and convenient operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of a karst ground collapse simulation test device according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic cross-sectional view of the bottom plate of a karst ground collapse simulation test device according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic cross-sectional view of the placement plate of a karst ground collapse simulation test device according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic cross-sectional view of the support structure of a karst ground collapse simulation test device according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic cross-sectional view of the glass cover of a karst ground collapse simulation test device according to an embodiment of the present invention.

[0024] In the diagram: 1. Base plate; 2. Roller; 3. Handle 1; 4. Pressure LCD screen; 5. Glass cover; 6. Handle 2; 7. Spray pipe; 8. Control switch box; 9. Slot; 10. Fixing plate; 11. Placement plate; 12. Karst ground sample; 13. Through groove; 14. Bracket; 15. Cylinder; 16. Telescopic rod; 17. Disc; 18. Elastic element; 19. Support plate; 20. Pressure detection plate; 21. Round hole; 22. Groove; 23. Glass groove; 24. Mounting hole; 25. Nozzle. Detailed Implementation

[0025] To make the objectives, technical solutions and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0026] Please see Figures 1 to 5 This utility model provides an embodiment of a karst ground collapse simulation test device, comprising a base plate 1, an experimental cover, a spray pipe 7, and a placement plate 11. Two vertically arranged fixing plates 10 are fixed on the upper surface of the base plate 1, and four rollers 2 arranged in a rectangular array are fixed on the lower surface of the base plate 1. A handle 3 is fixed on one side of the base plate 1. The four rollers 2 can support the base plate 1, making the overall movement and transportation of the device stable. The handle 3 facilitates the overall movement and transportation of the device. The placement plate 11 is fixed above the base plate 1 by the two fixing plates 10. A through groove 13 is opened on the upper surface of the placement plate 11. The upper surface of the placement plate 11 is used to fix and place the karst ground sample 12 to be tested, so as to ensure that the lower part of the karst ground sample 12 is suspended.

[0027] A bracket 14 is fixed to the upper surface of the base plate 1. A groove 22 is provided on the bracket 14. A cylinder 15 is fixed to the top of the inner wall of the groove 22. A telescopic rod 16 is provided at the upper end of the cylinder 15. The cylinder 15 provides power for the extension and retraction of the telescopic rod 16, so that the support plate 19 can fit against the lower surface of the karst ground sample 12. When the karst ground sample 12 collapses or completely collapses, the pressure data of the pressure detection plate 20 can be displayed on the pressure LCD screen 4. At the same time, the corresponding rainfall can be accurately detected. A disc 17 is fixed to the top of the telescopic rod 16 of the cylinder 15. A circular hole 21 is provided at the top of the inner wall of the groove 22. The top end of the telescopic rod 16 of the cylinder 15 passes through the circular hole 21. The top end of the telescopic rod 16, which is connected to the cylinder 15 through the circular hole 21, passes through the bracket 14. A pressure detection disc 20 is fixed on the upper surface of the disc 17. An elastic element 18 is fixed on the upper surface of the pressure detection disc 20. In this embodiment, the elastic element is a helical spring. A support disc 19 is fixed on the top end of the elastic element 18. The elastic element 18 can deform elastically as needed. When the karst ground sample 12 deforms and collapses, the elastic element 18 is compressed, and the pressure detection disc 20 is pressed down to facilitate the detection of the collapse of the karst ground sample 12.

[0028] In this embodiment, the experimental cover is a transparent glass cover 5, which is inserted into the base plate 1. The glass cover 5 covers all the components on the base plate 1 (placement plate, support cover, etc.). The upper surface of the base plate 1 is also provided with a slot 9, and the bottom end of the glass cover 5 is inserted into the slot 9. The slot 9 facilitates the installation and removal of the glass cover 5, and can also seal the karst ground sample 12 to eliminate the influence of external factors. The lower surface of the glass cover 5 is provided with a glass groove 23. A pressure LCD screen 4 is installed on one side of the glass cover 5, and a control switch box 8 is fixed on one side of the glass cover 5. The control switch box 8 has a display screen and buttons installed sequentially from top to bottom on one side. The LCD screen 4 can display the pressure detected by the pressure detection disc 20. The bottom end of the spray pipe 7 passes through the glass cover 5 and extends into the glass groove 23. The upper surface of the glass cover 5 has a mounting hole 24. The bottom end of the spray pipe 7 passes through the mounting hole 24 and is fixed. Handles 2 6 are fixed on both sides of the upper surface of the glass cover 5. The mounting hole 24 facilitates the spray pipe 7 to pass through and extend into the glass groove 23. The handles 2 6 facilitate the removal of the glass cover 5. A nozzle 25 is installed at the bottom end of the spray pipe 7. The nozzle is located directly above the karst ground sample 12. The upper end of the spray pipe 7 is used to connect a water supply device. The water supply device is used to supply water into the spray pipe 7 and adjust the water flow rate.

[0029] In a preferred embodiment, the nozzle 25 is a circular disc structure with multiple spray holes distributed on its lower surface. The circular disc structure of the nozzle sprays water through these spray holes, thus better simulating a rainfall process.

[0030] The working process of this karst ground collapse simulation test device is as follows: When a karst ground collapse simulation test is required, a karst ground sample 12 is placed on the upper surface of the placement plate 11. Then, the control switch box 8 is operated to start the cylinder 15, extend and retract the telescopic rod 16, and allow the support plate 19 to fit against the lower surface of the karst ground sample 12. Next, the glass cover 5 is inserted into the slot 9, water is introduced into the spray pipe 7, and then sprayed from the nozzle 25 onto the upper surface of the karst ground sample 12. The flow rate in the spray pipe 7 is set according to the test requirements. When the karst ground sample 12 collapses or completely collapses, the pressure data on the pressure detection plate 20 is displayed on the pressure LCD screen 4. This karst ground collapse simulation test device can accurately detect whether karst ground collapses under different rainfall conditions.

[0031] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0032] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A karst ground collapse simulation test device; characterized in that, Includes base plate, experimental hood, spray pipes, and placement plate; The placement plate is fixed to the top of the base plate by two fixing plates. The placement plate is provided with a through groove. The karst ground sample to be tested is supported on the placement plate and the karst ground sample is located above the through groove. The base plate is also provided with a bracket, on which a pressure detection plate is fixedly mounted. A support plate is provided above the pressure detection plate, and the support plate is supported on the pressure detection plate by an elastic element. The support plate is attached to the lower surface of the karst ground sample. The experimental hood is supported on the base plate and covers the placement plate and bracket inside it. The lower end of the spray pipe is connected to a nozzle, which is located directly above the karst ground sample. The upper end of the spray pipe extends through the experimental hood to the outside of the experimental hood.

2. The karst ground collapse simulation test device according to claim 1, characterized in that: The bracket has a groove, and a cylinder is fixed in the groove. The top of the cylinder's telescopic rod has a disc fixed to its end, and the pressure detection disc is fixed on the disc.

3. The karst ground collapse simulation test device according to claim 1, characterized in that: The lower surface of the base plate is fixed with four rollers arranged in a rectangular array.

4. The karst ground collapse simulation test device according to claim 3, characterized in that: A handle is fixed to one side of the base plate.

5. The karst ground collapse simulation test device according to claim 2, characterized in that: A circular hole is provided at the top of the inner wall of the groove, and the top of the cylinder's telescopic rod passes through the circular hole.

6. The karst ground collapse simulation test device according to claim 1, characterized in that: The experimental enclosure is a transparent glass enclosure.

7. The karst ground collapse simulation test device according to claim 6, characterized in that: A pressure LCD screen is installed on one side of the glass cover, and a control switch box is fixed on the other side of the glass cover. A display screen and buttons are installed sequentially from top to bottom on one side of the control switch box.

8. The karst ground collapse simulation test device according to claim 6, characterized in that: The upper surface of the glass cover has an installation hole, through which the spray pipe passes and is fixed. Two handles are fixed on both sides of the upper surface of the glass cover. The upper end of the spray pipe is used to connect to a water supply device.

9. The karst ground collapse simulation test device according to claim 6, characterized in that: The upper surface of the base plate has a slot, and the bottom end of the glass cover is inserted into the slot.

10. The karst ground collapse simulation test device according to claim 1, characterized in that: The nozzle has a circular disc structure, and multiple spray holes are distributed on the lower surface of the nozzle.

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