A soil column test specimen preparation device for geotextile drainage test

Abstract

The application discloses a kind of for geotextile drainage test soil column test piece preparation device, including: workbench, soil column test piece, light compactor and the like structure, soil column test piece is installed on workbench by soil column test piece fixing device, the soil column test piece is hollow structure, for filling soil body;The soil column test piece side wall leaves transverse geotextile exposed seam, for storing geotextile in the process of preparation to soil body inside;Light compactor is set on the workbench by driving device, and the driving device can drive the light compactor to move up and down, and then the soil body in the soil column test piece is compacted;Sealing mechanism is used to compact geotextile, and the gap of geotextile exposed seam is sealed;The preparation process of the application can be recycled and continuously carried out, with high work efficiency, improved preparation efficiency, and shortened test cycle.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and in particular to a soil column specimen preparation device for geotextile drainage tests. Background Technology

[0002] The roadbed is the foundation of the road surface, and its stability directly affects the effective functioning and service life of the highway. This requires the roadbed to be kept dry at all times to ensure it has sufficient strength and stability. However, due to the influence of the terrain, when constructing highways in areas with poor hydrogeological conditions, it is very easy for poor drainage to cause natural disasters such as roadbed settlement, strength reduction, and slope damage, resulting in huge economic losses.

[0003] Drainage geotextile is a permeable and flexible geosynthetic material, mainly made of thermoplastic polymers such as high-density polyethylene or polyester through weaving. It has high strength, good integrity and continuity, and strong corrosion resistance. When applied to roadbeds, it can effectively control roadbed wetting caused by capillary action, play a good drainage role, and improve the roadbed's support capacity.

[0004] Currently, most laboratory studies on the moisture regulation effect of drainage geotextiles on unsaturated soils employ soil column tests. The preparation method involves manually controlling a lightweight compactor to compact pre-prepared soil with a predetermined moisture content into cylindrical molds in batches. After the specimens are formed, the exposed geotextile holes in the center of the mold are sealed with plastic wrap and tape. The sealed specimens are then placed in a constant temperature and humidity curing chamber for further curing.

[0005] While existing methods of manually compacting soil in batches can achieve the formation of soil column specimens, the operation is cumbersome and complex, resulting in low specimen formation efficiency. After the specimen is formed, it is difficult to guarantee the sealing quality of the exposed holes in the geotextile. Moisture is more likely to be discharged from the soil column through the residual voids rather than through the geotextile, affecting the accuracy of the test. Furthermore, when the specimen is placed in a constant temperature and humidity chamber for curing, the lack of natural light results in a small moisture content gradient between the geotextile inside and outside the soil column, leading to low drainage efficiency of the geotextile and affecting the test results. Summary of the Invention

[0006] The purpose of this invention is to provide a soil column specimen preparation device for geotextile drainage tests, so as to solve the problems existing in the prior art, reduce the manpower consumed in the specimen preparation process, improve the specimen preparation efficiency, and enhance the experimental accuracy.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention provides a soil column specimen preparation device for geotextile drainage tests, comprising: a workbench; a soil column specimen, which is mounted on the workbench via a soil column specimen fixing device, the soil column specimen having a hollow structure with an opening at the top for filling with soil; transverse geotextile exposed seams on the sidewalls of the soil column specimen for storing geotextile inside the soil during specimen preparation; a lightweight compactor, which is mounted on the workbench via a driving device, with its bottom positioned above the soil column specimen, and the driving device capable of moving the lightweight compactor up and down to compact the soil inside the soil column specimen; and a sealing mechanism for compacting the geotextile and sealing the gaps in the exposed geotextile seams. The specimen preparation process of this invention can be continuously repeated, resulting in high work efficiency, improved specimen preparation efficiency, and a shortened test cycle.

[0009] Optionally, a lighting mechanism is also included, which is located near the exposed seams of the geotextile to simulate natural sunlight. This invention can automatically complete specimen preparation by simply placing soil in batches, and can simulate natural sunlight to dry the geotextile, which can significantly shorten the specimen preparation time while improving the accuracy of the test.

[0010] Optionally, the driving device includes multiple hydraulic lifting columns fixedly mounted on the workbench. The top of each hydraulic lifting column is equipped with a lightweight compactor fixing plate, and the lightweight compactor is mounted on the lightweight compactor fixing plate. The hydraulic lifting column is electrically connected to a hydraulic system operation panel, which controls the hydraulic system to automatically compact the soil. After the specimen is formed, there is no need to seal the soil column specimen. The operation is easy and convenient, and workers can operate it without technical training.

[0011] Optionally, the lightweight compactor fixing plate has a lightweight compactor sleeve hole; the lightweight compactor passes through the lightweight compactor sleeve hole, and the height of the lightweight compactor within the lightweight compactor sleeve hole is adjustable; the diameter of the bottom surface of the lightweight compactor is the same as the inner diameter of the soil column specimen.

[0012] Optionally, the lightweight compactor has threads on its outer wall, and a fixing nut is threaded onto the lightweight compactor. The outer diameter of the fixing nut is larger than the inner diameter of the hole in the lightweight compactor, and the bottom of the fixing nut abuts against the top of the fixing plate of the lightweight compactor. The outer wall of the lightweight compactor has a first scale for controlling soil compaction height and a second scale for controlling soil compaction height.

[0013] Optionally, a base plate is fixedly provided on the workbench, and the driving device and the soil column specimen are both set on the base plate.

[0014] Optionally, the soil column specimen fixing device is a hollow cylindrical structure. The soil column specimen fixing device includes an upper part and a lower part. The inner diameter of the upper part is the same as the inner diameter of the soil column specimen, and the inner diameter of the lower part is the same as the outer diameter of the soil column specimen. The lower part is cut in half along the diameter to form an arc cavity for storing the soil column specimen.

[0015] Optionally, the upper outer wall of the soil column specimen fixing device is provided with a push-pull buckle that can move up and down, and the buckle fixing device is fixedly provided on the upper outer wall of the soil column specimen. The top of the buckle fixing device is provided with a cylindrical reserved hole, and the push-pull buckle can be embedded in the cylindrical reserved hole.

[0016] Optionally, the sealing mechanism includes a geotextile sealing shell disposed on the outer wall of the soil column specimen, the exposed seam of the geotextile located inside the geotextile sealing shell, and a liftable geotextile sealing plate hinged to the outside of the geotextile sealing shell; a geotextile compaction plate is provided inside the geotextile sealing shell, and the compaction plate is used to seal the residual gaps of the exposed seam of the geotextile, avoiding errors caused by manual sealing, improving the accuracy of the test, and saving manpower and resources. The geotextile compaction plate has an arc-shaped groove on the side near the soil column specimen, and a pressure point is formed at the arc-shaped groove of the geotextile compaction plate. The compaction plate has a lifting groove, which is movably fitted onto the geotextile compaction plate lifting track. The geotextile compaction plate lifting track is fixedly installed inside the geotextile sealing shell. A lifting bolt is installed on the upper plate of the geotextile sealing shell. The bottom of the lifting bolt is provided with a descent control nut and an ascending control nut. The end of the geotextile compaction plate has a through dumbbell-shaped bolt pre-drilled hole. The bottom of the lifting bolt passes through the dumbbell-shaped bolt pre-drilled hole, and the descent control nut and ascending control nut are respectively engaged with the upper and lower parts of the dumbbell-shaped bolt pre-drilled hole.

[0017] Optionally, the illumination mechanism includes a fluorescent tube, which simulates natural light to better approximate the engineering application environment and can increase the difference in moisture content between the soil and the geotextile section, making the test phenomenon more obvious. The fluorescent tube is located on the lower surface of the upper plate of the geotextile sealing shell. Both ends of the fluorescent tube have lamp tube wiring ports for connecting to an external power source. The fluorescent tube is covered with a lamp cover made of transparent material.

[0018] The present invention achieves the following technical effects compared to the prior art:

[0019] Compared to the manual batch compaction method for soil specimen preparation, the device of this invention is simple and convenient to operate. Operators only need to place the weighed soil into the soil column specimen sequentially and operate the hydraulic system to complete the compaction, greatly reducing the labor intensity of the testing personnel. After specimen preparation, the device eliminates the need for manual sealing, and the compaction plate further enhances the sealing of exposed seams in the geotextile, improving the accuracy of specimen preparation and testing. The device incorporates fluorescent lamps inside the geotextile sealing shell to simulate natural light, more closely resembling the actual application environment of geotextiles. Compared to the previous method of directly placing the soil column specimen in a constant temperature and humidity chamber, this improves the accuracy of the test. Using the device of this invention for specimen preparation can shorten the testing cycle to a certain extent and reduce the manpower and material resources consumed during the testing process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall device of the present invention;

[0022] Figure 2 This is a schematic diagram showing the disassembly and assembly of the constituent modules of the present invention;

[0023] Figure 3 This is a schematic diagram of the soil column specimen of the present invention;

[0024] Figure 4 This is a schematic diagram of the geotextile sealing mechanism and the illumination mechanism of the present invention;

[0025] Figure 5 This is a schematic diagram showing the disassembled components of the geotextile sealing mechanism of the present invention;

[0026] In the diagram: 1. Workbench; 1-1. Hydraulic system control panel; 1-2. Hydraulic lifting column; 2. Base plate; 3. Soil column specimen; 3-1. Clip fixing device; 3-1-1. Cylindrical pre-drilled hole; 3-2. Lifting bolt; 3-2-1. Lowering control nut; 3-2-2. Raising control nut; 3-3. Geotextile sealing shell; 3-4. Liftable geotextile sealing plate; 3-4-1. Cylindrical steel rod; 3-4-2. Pre-drilled sleeve hole; 3-5. Geotextile exposed seam; 3-6. Geotextile press... Solid plate, 3-6-1 dumbbell-shaped bolt pre-drilled hole, 3-6-2 compaction plate lifting groove, 3-7 geotextile compaction plate lifting track, 3-8 lamp tube connection port, 3-9 fluorescent lamp tube, 3-10 lamp cover, 4 soil column specimen fixing device, 4-1 push-pull buckle, 5 light compactor fixing plate, 5-1 light compactor sleeve hole, 6 light compactor, 6-1 fixing nut, 6-2 first scale for soil compaction height control, 6-3 second scale for soil compaction height control. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The purpose of this invention is to provide a soil column specimen preparation device for geotextile drainage tests, so as to solve the problems existing in the prior art, reduce the manpower consumed in the specimen preparation process, improve the specimen preparation efficiency, and enhance the experimental accuracy.

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] To address the current situation where manual specimen preparation is complex and inefficient, this invention proposes a device that can efficiently and quickly prepare specimens by simply placing them into the soil in batches. It can also simulate natural sunlight to dry geotextiles, significantly reducing specimen preparation time while improving experimental accuracy. See details below. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the soil column specimen preparation device for geotextile drainage tests provided by this invention includes a soil column specimen 3 and a lightweight compactor 6, which are installed on a workbench via a soil column specimen fixing device 4. The soil column specimen 3 has a hollow structure for filling with soil. The sidewall of the soil column specimen 3 has transverse geotextile exposed seams 3-5 for storing geotextile inside the soil during specimen preparation. The lightweight compactor 6 is mounted on the workbench 1 via a driving device, which moves the lightweight compactor 6 up and down to compact the soil inside the soil column specimen 3. A sealing mechanism is used to compact the geotextile and seal the gaps in the geotextile exposed seams 3-5. A lighting mechanism is located near the geotextile exposed seams 3-5 to simulate natural light. This invention can automatically complete specimen preparation by simply adding soil in batches and can simulate natural light to dry the geotextile, significantly shortening the specimen preparation time while improving the accuracy of the test.

[0031] The structure of the driving device of this invention is not limited. For precise control, in one specific embodiment, the driving device adopts multiple hydraulic lifting columns 1-2 fixedly installed on the workbench 1. The top of the hydraulic lifting columns 1-2 is provided with a lightweight compactor fixing plate 5, and the lightweight compactor 6 is installed on the lightweight compactor fixing plate 5. The hydraulic lifting columns 1-2 are electrically connected to a hydraulic system operation panel 1-1. The workbench 1 adopts a hydraulic system workbench, which is truncated pyramidal in shape. It can control the cylindrical hydraulic lifting columns 1-2 to move up and down, thereby driving the lightweight compactor 6 fixed on the lightweight compactor fixing plate 5 to compact the soil. The base plate 2 is located on the upper surface of the workbench 1 to avoid wear and tear on the workbench 1 after multiple parts production. The number of compaction times and force parameters can be set through the hydraulic system operation panel 1-1.

[0032] To allow for flexible adjustment of the vertical position of the lightweight compactor 6, in this embodiment, the lightweight compactor fixing plate 5 has a lightweight compactor sleeve hole 5-1. The lightweight compactor 6 passes through the lightweight compactor sleeve hole 5-1, and the outer wall of the lightweight compactor 6 has threads. A fixing nut 6-1 is threaded onto the lightweight compactor 6, and the outer diameter of the fixing nut 6-1 is larger than the inner diameter of the lightweight compactor sleeve hole 5-1. The bottom of the fixing nut 6-1 abuts against the top of the lightweight compactor fixing plate 5. The compactor 6 has a first scale 6-2 and a second scale 6-3 for controlling the soil compaction height on its outer wall. By rotating the lightweight compactor 6, the fixing nut 6-1 is aligned with the first scale 6-2 and the second scale 6-3 for controlling the soil compaction height. This allows the pre-weighed soil to be filled into the soil column specimen 3 in two batches according to the expected density. The diameter of the bottom surface of the lightweight compactor 6 is the same as the inner diameter of the soil column specimen 3, and the two are on the same center line.

[0033] The soil column specimen fixing device 4 is a hollow cylindrical structure with a transverse semi-circular geotextile exposed seam 3-5 in the middle of the cylinder, used to store geotextile inside the soil during the specimen preparation process. The outer wall of the soil column specimen 3 is provided with a geotextile sealing shell 3-3, and the geotextile exposed seam 3-5 is located inside the geotextile sealing shell 3-3. The upper surface of the lower plate of the geotextile sealing shell 3-3 is closely attached to the lower surface of the geotextile, used to support the exposed part of the geotextile. A liftable geotextile sealing plate 3-4 is hinged to the outside of the geotextile sealing shell 3-3. In a specific embodiment, the liftable geotextile sealing plate 3-4 is a rectangular thin plate. The connection between the geotextile sealing shell 3-3 and the liftable geotextile sealing plate 3-4 can be realized by nesting the pre-reserved sleeve hole 3-4-2 on its upper part with the cylindrical steel rod 3-4-1.

[0034] A geotextile compaction plate 3-6 is installed inside the geotextile sealing shell 3-3. The geotextile compaction plate 3-6 seals the remaining gaps in the external geotextile seam 3-5, avoiding errors caused by manual sealing, improving the accuracy of the test, and saving manpower and resources. An arc-shaped groove is formed on the side of the geotextile compaction plate 3-6 near the soil column specimen 3. A compaction plate lifting groove 3-6-2 is formed at the arc-shaped groove of the geotextile compaction plate 3-6. The compaction plate lifting groove 3-6-2 is movably fitted onto the geotextile compaction plate lifting track 3-7, which is fixedly installed inside the geotextile sealing shell 3-3. A lifting bolt 3-2 passes through the upper plate of the geotextile sealing shell 3-3 for lifting... The bottom of bolt 3-2 is provided with a descent control nut 3-2-1 and a rise control nut 3-2-2. The end of the geotextile compaction plate 3-6 is provided with a through dumbbell-shaped bolt pre-drilled hole 3-6-1. The bottom of the lifting bolt 3-2 passes through the dumbbell-shaped bolt pre-drilled hole 3-6-1, and the descent control nut 3-2-1 and the rise control nut 3-2-2 are respectively engaged with the upper and lower parts of the dumbbell-shaped bolt pre-drilled hole 3-6-1. By rotating the lifting bolt 3-2, the geotextile compaction plate 3-6 can be vertically raised and lowered in the track. When the geotextile compaction plate 3-6 is lowered to the lowest point, it can be closely attached to the upper surface of the geotextile, preventing water in the soil from flowing out through the remaining gaps outside the geotextile and affecting the test accuracy.

[0035] The soil column specimen fixing device 4 includes an upper part and a lower part. The inner diameter of the upper part is the same as the inner diameter of the soil column specimen 3, and the inner diameter of the lower part is the same as the outer diameter of the soil column specimen 3. The lower part is cut in half along the diameter to form an arc cavity for storing the soil column specimen 3. The upper outer wall of the soil column specimen fixing device 4 is provided with a push-pull buckle 4-1 that can move up and down. The buckle fixing device 3-1 is fixedly installed on the upper outer wall of the soil column specimen 3. The top of the buckle fixing device 3-1 has a cylindrical reserved hole 3-1-1. The push-pull buckle 4-1 can be inserted into the cylindrical reserved hole 3-1-1 to further strengthen the connection between the soil column specimen 3 and the soil column specimen fixing device 4 and prevent them from separating due to vibration during the compaction process.

[0036] In this embodiment, the illumination mechanism uses a cuboid fluorescent tube 3-9 to simulate natural light, which is closer to the engineering application environment and can increase the difference in moisture content between the soil and the geotextile section, making the test phenomenon more obvious. The fluorescent tube 3-9 is located on the lower surface of the upper plate of the geotextile sealing shell 3-3. Both ends of the fluorescent tube 3-9 have lamp tube wiring ports 3-8 for connecting to an external power source. The fluorescent tube 3-9 is covered with a lamp cover 3-10, which is made of transparent material to prevent the fluorescent tube 3-9 from being damaged by the hammer of the compactor.

[0037] The specific working process of this invention includes:

[0038] Prepare soil samples in advance according to the required moisture content and density, and divide them into two equal parts by weight. Place the soil column specimen 3 into the soil column specimen fixing device 4, and push down the push-pull buckle 4-1 to make it nest into the cylindrical reserved hole 3-1-1 in the buckle fixing device 3-1. Then fill the first batch of soil into the soil column specimen 3. Rotate the light compactor 6 to align the fixing nut 6-1 with the soil compaction height control first scale 6-3. Turn on the hydraulic system through the hydraulic system operation panel 1-1 to compact the soil until the soil surface is flush with the exposed seam 3-5 of the geotextile. Stop the operation of the hydraulic system.

[0039] Open the liftable geotextile sealing plate 3-4, insert the geotextile of the pre-determined size and shape into the soil column specimen 3 along the exposed seam 3-5, and then rotate the lifting bolt 3-2 downwards to make the lowering control nut 3-2-1 push the geotextile compaction plate 3-6 downwards along the geotextile compaction plate lifting track 3-7 until the lower surface of the geotextile compaction plate 3-6 is in full contact with the upper surface of the geotextile and the geotextile is under pressure. Finally, cover it with the liftable geotextile sealing plate 3-4.

[0040] Rotate the light compactor 6 upwards to reach the top position, place the remaining soil into the soil column specimen 3 along the soil column specimen fixing device 4, rotate the light compactor 6 downwards again to align the fixing nut 6-1 with the second scale 6-2 of the soil compaction height control, and then continue to start the hydraulic system to compact the remaining soil into the soil column specimen 3.

[0041] After the soil is compacted, the hydraulic system is turned off through the hydraulic system operation panel 1-1. The light compactor 6 is rotated upward again to reach the top position, and the push-pull buckle 4-1 is pushed upward to disengage it from the buckle fixing device 3-1, thereby removing the soil column specimen 3 from the soil column specimen fixing device 4.

[0042] Repeat the above operations to obtain soil column specimens under different working conditions. Then, place the soil column specimens 3 obtained under different working conditions into a constant temperature and humidity chamber, set the curing environment parameters, turn on the external power supply to make the fluorescent tubes 3-9 work normally, and weigh the mass change of the soil column specimens 3 on time during the curing period to obtain experimental data.

[0043] After the experiment, first rotate the lifting bolt 3-2 upwards so that the lifting control nut 3-2-2 lifts the geotextile compaction plate 3-6 and moves it upwards along the geotextile compaction plate lifting track 3-7 to the highest point. Then, disconnect the external power supply and turn off the fluorescent lamp tube 3-9. Open the geotextile sealing plate 3-4 to remove the geotextile. Finally, remove the soil from inside the soil column specimen 3.

[0044] In the description of this invention, it should be noted that the terms "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A soil column specimen preparation device for geotextile drainage tests, characterized in that, include: Workbench; The soil column specimen is mounted on the workbench by a soil column specimen fixing device. The soil column specimen has a hollow structure for filling with soil. The side wall of the soil column specimen has a transverse geotextile exposed seam for storing geotextile inside the soil during the specimen manufacturing process. A lightweight compactor is mounted on the workbench via a drive device, which can move the lightweight compactor up and down to compact the soil inside the soil column specimen. A sealing mechanism is used to compact the geotextile and seal the gaps in the exposed seams of the geotextile. The lighting mechanism is located near the exposed seams of the geotextile to simulate natural light. The sealing mechanism includes a geotextile sealing shell disposed on the outer wall of the soil column specimen, with the exposed seam of the geotextile located inside the geotextile sealing shell. A liftable geotextile sealing plate is hinged to the outer side of the geotextile sealing shell. A geotextile compaction plate is disposed inside the geotextile sealing shell. An arc-shaped groove is formed on the side of the geotextile compaction plate near the soil column specimen. A compaction plate lifting groove is formed at the arc-shaped groove of the geotextile compaction plate, and the compaction plate lifting groove is movably fitted onto the geotextile compaction plate. On the lifting track of the geotextile compaction plate, the lifting track is fixedly installed inside the geotextile sealing shell; a lifting bolt is provided on the upper plate of the geotextile sealing shell, and a lowering control nut and an upper control nut are provided at the bottom of the lifting bolt; a through dumbbell-shaped bolt pre-drilled hole is opened at the end of the geotextile compaction plate, and the bottom of the lifting bolt passes through the dumbbell-shaped bolt pre-drilled hole, and the lowering control nut and the upper control nut are respectively engaged with the upper and lower parts of the dumbbell-shaped bolt pre-drilled hole.

2. The soil column specimen preparation device for geotextile drainage test according to claim 1, characterized in that, The driving device includes multiple hydraulic lifting columns fixedly mounted on the workbench. A lightweight compactor fixing plate is provided on the top of the hydraulic lifting column, and the lightweight compactor is installed on the lightweight compactor fixing plate. The hydraulic lifting column is electrically connected to a hydraulic system operation panel.

3. The soil column specimen preparation device for geotextile drainage test according to claim 2, characterized in that, The lightweight compactor fixing plate has a lightweight compactor sleeve hole; the lightweight compactor passes through the lightweight compactor sleeve hole, and the height of the lightweight compactor within the lightweight compactor sleeve hole is adjustable; the diameter of the bottom surface of the lightweight compactor is the same as the inner diameter of the soil column specimen.

4. The soil column specimen preparation device for geotextile drainage test according to claim 3, characterized in that, The lightweight compactor has threads on its outer wall, and a fixing nut is threaded onto the lightweight compactor. The outer diameter of the fixing nut is larger than the inner diameter of the hole in the lightweight compactor, and the bottom of the fixing nut abuts against the top of the fixing plate of the lightweight compactor. The lightweight compactor has a first scale for controlling soil compaction height and a second scale for controlling soil compaction height on its outer wall.

5. The soil column specimen preparation device for geotextile drainage test according to claim 1, characterized in that, A base plate is fixedly installed on the workbench, and the driving device and the soil column specimen are both mounted on the base plate.

6. The soil column specimen preparation device for geotextile drainage test according to claim 1, characterized in that, The soil column specimen fixing device is a hollow cylindrical structure. The soil column specimen fixing device includes an upper part and a lower part. The inner diameter of the upper part is the same as the inner diameter of the soil column specimen, and the inner diameter of the lower part is the same as the outer diameter of the soil column specimen. The lower part is cut off in half along the diameter to form an arc cavity for storing the soil column specimen.

7. The soil column specimen preparation device for geotextile drainage test according to claim 6, characterized in that, The upper outer wall of the soil column specimen fixing device is provided with a push-pull buckle that can move up and down. The buckle fixing device is fixed at the upper outer wall of the soil column specimen. The top of the buckle fixing device is provided with a cylindrical reserved hole, and the push-pull buckle can be embedded in the cylindrical reserved hole.

8. The soil column specimen preparation device for geotextile drainage test according to claim 1, characterized in that, The illumination mechanism includes a fluorescent tube located on the lower surface of the upper plate of the geotextile sealing shell. The fluorescent tube has connection ports at both ends for connecting to an external power source. The fluorescent tube is covered with a lamp cover made of transparent material.

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