Simple unsaturated soil penetration testing device

Abstract

The utility model discloses a simple unsaturated soil penetration testing device which comprises a base, a first scouring bubble system, an air inlet and a first argil plate mounting groove are arranged in the base, a first argil plate is mounted in the first argil plate mounting groove, and a first groove is formed in the first argil plate mounting groove; the permeation cylinder is in sealed connection with the base and forms a sample placing area exposed out of the first scouring bubble system, the air inlet and the first argil plate mounting groove; and the top cover is internally provided with a second scouring bubble system and a second argil plate mounting groove, a second argil plate is mounted in the second argil plate mounting groove, and a second groove communicated with the second scouring bubble system is formed in the second argil plate mounting groove. The unsaturated soil permeability testing device disclosed by the utility model is focused on testing unsaturated permeability characteristics, is simple to design and manufacture and high in testing stability, and can more easily obtain accurate unsaturated permeability characteristics compared with a complicated testing system of a traditional pressure plate instrument.

Description

Technical Field

[0001] The utility model relates to the technical field of soil testing devices, in particular to a simple unsaturated soil penetration testing device. Background Art

[0002] Existing devices for measuring unsaturated soil permeability are all improvements based on pressure plate instruments. For example, the most classic pressure plate instrument (the SDSWCC Stress-Dependent Soil-Water Characteristic Curve Pressure Plate Instrument System produced by Geo-Expert) can be upgraded with a permeability system, which provides more comprehensive testing capabilities. However, when it comes to permeability, unsaturated permeability is inherently difficult to test and results can fluctuate significantly. When combined with complex testing systems, accurately obtaining unsaturated permeability characteristics is even more challenging. Utility Model Content

[0003] The purpose of the utility model is to provide a simple unsaturated soil permeability testing device based on the above-mentioned deficiencies in the prior art, through which accurate unsaturated permeability characteristics can be easily obtained.

[0004] The purpose of this utility model is achieved by the following technical solutions:

[0005] A simple unsaturated soil penetration test device, comprising:

[0006] A base, wherein the base is provided with a first flushing bubble system, an air inlet, and a first clay plate mounting groove, wherein a first clay plate is mounted in the first clay plate mounting groove, and wherein the first clay plate mounting groove is provided with a first groove communicating with the first flushing bubble system and the air inlet;

[0007] a permeation cylinder, sealedly connected to the base and forming a sample placement area exposing the first flushing bubble system, the air inlet, and the first clay plate mounting groove;

[0008] A top cover is connected to the infiltration cylinder, wherein a second flushing bubble system and a second clay plate mounting groove are provided in the top cover, a second clay plate is mounted in the second clay plate mounting groove, and a second groove communicating with the second flushing bubble system is provided in the second clay plate mounting groove.

[0009] Optionally, the first flushing bubble system includes a flushing bubble water inlet and a flushing bubble penetration drain outlet, and the flushing bubble water inlet and the flushing bubble penetration drain outlet are communicated with the first groove.

[0010] Optionally, the air inlet passes through the side wall and top surface of the base, and a permeable stone is embedded in the top surface.

[0011] Optionally, the second flushing bubble system includes a flushing bubble drain port and a flushing bubble infiltration water inlet, and the flushing bubble drain port and the flushing bubble infiltration water inlet are in communication with the second groove.

[0012] Optionally, the flushing bubble water inlet, the flushing bubble penetration drain, the first clay plate mounting groove, the flushing bubble drain, the flushing bubble penetration water inlet and the second clay plate mounting groove are connected to the sample placement area, and the air inlet is connected to the sample placement area through the permeable stone.

[0013] Optionally, the first groove and the second groove both include a plurality of concentric circular grooves of gradually increasing size and a cross groove passing through the centers of the plurality of circular grooves, the flushing bubble infiltration water inlet and the flushing bubble infiltration drain outlet are both located at the intersection of the cross grooves, and the flushing bubble water inlet and the flushing bubble drain outlet are both located at the intersection of any of the circular grooves and the cross groove.

[0014] Optionally, the air inlet passes through the base and is located next to the first clay plate installation groove.

[0015] Optionally, a cylinder mounting groove for mounting the permeation cylinder is provided in the base, and a sealing ring is connected between the base and the permeation cylinder to achieve sealing between the base and the permeation cylinder.

[0016] Optionally, the infiltration cylinder and the top cover are installed with interference fit.

[0017] Optionally, the first clay plate installation groove and the second clay plate installation groove are positioned opposite to each other.

[0018] The advantages of the utility model are:

[0019] The unsaturated soil permeability testing device of the utility model focuses on testing the unsaturated permeability characteristics. It is simple in design and manufacturing and has high test stability. Compared with the complex test system of the traditional pressure plate instrument, it can more easily obtain accurate unsaturated permeability characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the penetration testing device of the present invention;

[0021] Figure 2 A perspective view of a penetration testing device according to the present invention;

[0022] Figure 3 This is a structural diagram of the first clay plate installation groove of the present invention;

[0023] Figure 4 This is a structural diagram of the second clay plate installation groove of the present invention. DETAILED DESCRIPTION

[0024] The marks in the figure are: 1. Scour bubble penetration water inlet, 2. Scour bubble drain outlet, 3. Top cover, 4. Second clay plate, 5. Infiltration cylinder, 6. Sample, 7. Permeable stone, 8. First clay plate, 9. Base, 10. Sealing ring, 11. Scour bubble penetration drain outlet, 12. Air inlet, 13. Scour bubble water inlet, 14. Second groove, 15. First groove, 30. First clay plate mounting groove, 40. Second clay plate mounting groove, 50. Sample placement area, 60. Cylinder mounting groove, 141 / 151, circular groove, 142 / 152 cross groove.

[0025] Example: See Figure 1 FIG. 1 shows a simplified unsaturated soil permeability testing device according to an embodiment, which includes a base 9, in which a first scouring bubble system, an air inlet 12, and a first clay plate mounting groove 30 are provided. The first clay plate 8 is mounted in the first clay plate mounting groove 30, and the first clay plate mounting groove 30 is provided with a first groove 15 connected to the first scouring bubble system and the air inlet 12; a permeation cylinder 5 is sealedly connected to the base 9 and forms a sample placement area 50 exposing the first scouring bubble system, the air inlet 121, and the first clay plate mounting groove 30; and a top cover 3 is connected to the permeation cylinder 5. The top cover 3 is provided with a second scouring bubble system and a second clay plate mounting groove 40, in which a second clay plate 4 is mounted. The second clay plate mounting groove 40 is provided with a second groove 14 connected to the second scouring bubble system.

[0026] In this embodiment, the first flushing bubble system includes a flushing bubble water inlet 13 and a flushing bubble penetration drain outlet 11 , and the flushing bubble water inlet 13 and the flushing bubble penetration drain outlet 11 are communicated with the first groove 15 .

[0027] In this embodiment, the air inlet 12 passes through the side wall and the top surface of the base 9, and a permeable stone 7 is embedded in the top surface.

[0028] In this embodiment, the second flushing bubble system includes a flushing bubble drain port 2 and a flushing bubble infiltration water inlet 1 , and the flushing bubble drain port 2 and the flushing bubble infiltration water inlet 1 are communicated with the second groove 14 .

[0029] In this embodiment, the scouring bubble water inlet 13, the scouring bubble penetration drain port 11, the first clay plate mounting groove 30, the scouring bubble drain port 2, the scouring bubble penetration water inlet 1 and the second clay plate mounting groove 40 are connected to the sample placement area 50, and the air inlet 12 is connected to the sample placement area 50 through the permeable stone 7.

[0030] In this embodiment, the first groove 15 and the second groove 14 both include a plurality of concentric circular grooves 141 / 151 of gradually increasing size and a cross groove 142 / 152 passing through the centers of the plurality of circular grooves 141 / 151. The flushing bubble infiltration water inlet 1 and the flushing bubble infiltration drain outlet 11 are both located at the intersection of the cross grooves 142 / 152, and the flushing bubble water inlet 13 and the flushing bubble drain outlet 2 are both located at the intersection of any circular groove 141 / 151 and the cross groove 142 / 152.

[0031] In this embodiment, the air inlet 12 passes through the base 9 and is located next to the first clay plate installation groove 30 .

[0032] In this embodiment, a cylinder mounting groove 60 for mounting the permeation cylinder 5 is provided in the base 9 , and a sealing ring 10 is connected between the base 9 and the permeation cylinder 5 to achieve sealing between the base 9 and the permeation cylinder 5 .

[0033] In this embodiment, the permeation cylinder 5 and the top cover 3 are installed with interference fit.

[0034] In this embodiment, the first clay plate installation groove 30 and the second clay plate installation groove 40 are positioned opposite to each other.

[0035] The following description will further explain the characteristics and functions of the present invention.

[0036] First, it's worth noting that the unsaturated soil permeameter is an instrument used to measure the unsaturated permeability characteristics of soil. By measuring and analyzing the unsaturated permeability characteristics of soil, we can better understand water migration and the formation and distribution of groundwater, providing a scientific basis for water resource management, agricultural production, and soil conservation. Furthermore, the unsaturated permeameter can be used in research and applications such as soil pollution control, groundwater pollution prevention, and geological disaster prediction.

[0037] Therefore, this embodiment proposes a simple unsaturated soil permeability test device, and the overall test process of the device is as follows:

[0038] Step (1) preparing a saturated first / second clay plate;

[0039] Step (2) preparing a saturated sample 6 and measuring the saturated water content and saturated permeability coefficient of the sample;

[0040] Step (3) placing the test piece 6 in the sample placement area 50 of the test device of this embodiment, filling the first / second grooves with the flushing bubble system on the back of the first / second clay plate, and flushing away the bubbles on the back;

[0041] Step (4) setting the pore water pressure under the first / second clay plate to 0 through a hydraulic controller (not shown), closing the exhaust hole in the flushing system, and setting the initial water volume in the hydraulic controller cavity to 0;

[0042] Step (5) After the test device is installed, air pressure is applied to the air inlet 12 through an air pressure controller (not shown) to check the sealing of the system;

[0043] Step (6) setting the gas pressure equal to the desired matrix suction value;

[0044] Step (7) the sample is drained through the first / second clay plate until equilibrium is reached, and the amount of water drained under the matrix suction in this section is recorded;

[0045] Step (8) closing the drain pipe switch and flushing the bubbles under the first / second clay plate by flushing the bubble system;

[0046] Step (9) applying a small pressure gradient to the water phase through a hydraulic controller to perform a permeability test, and after establishing a steady-state flow condition, measuring the permeability coefficient under the matrix suction;

[0047] Step (10) closing the drain pipe switch and flushing the bubbles under the first / second clay plate by flushing the bubble system;

[0048] Step (11): Apply higher gas pressure and repeat steps (6) to (10);

[0049] After applying the highest matrix pressure in step (12), the air pressure in the instrument is immediately released, and the soil sample is taken out to measure the moisture content at this time to verify whether the test data measurement is accurate;

[0050] Step (13) draws a relationship graph between matrix suction and water content, thereby providing a soil-water characteristic curve; draws a relationship graph between permeability coefficient and water content, thereby providing a permeability coefficient model.

[0051] The production process of the saturated clay board in the above test process includes, taking the top cover as an example:

[0052] (1) Immerse the top cover in the water tank;

[0053] (2) Fill the back of the clay plate and the scouring bubble infiltration inlet 1 and the scouring bubble drainage outlet 2 with water;

[0054] (3) Applying positive water pressure to the flushing bubble infiltration water inlet 1 through the hydraulic controller to seal the flushing bubble drainage port 2 and discharge the gas in the clay plate;

[0055] (4) After 24 hours, the clay board is considered saturated.

[0056] The flushing bubble system process in the above test process takes the top cover as an example:

[0057] like Figure 3As shown, after the flushing bubble drain port 2 is opened, water enters from the flushing bubble infiltration water inlet 1 , and the water flows along the groove to fill the entire space, taking the bubbles away from the flushing bubble drain port 2 .

[0058] In summary, the unsaturated soil permeability testing device of the present invention focuses on testing unsaturated permeability characteristics. It has a simple design and manufacturing process and high test stability. Compared with the complex testing system of the traditional pressure plate instrument, it can more easily obtain accurate unsaturated permeability characteristics.

[0059] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A simple unsaturated soil permeability test device, characterized in that: include: A base, wherein the base is provided with a first flushing bubble system, an air inlet, and a first clay plate mounting groove, wherein a first clay plate is mounted in the first clay plate mounting groove, and wherein the first clay plate mounting groove is provided with a first groove communicating with the first flushing bubble system and the air inlet; a permeation cylinder, sealedly connected to the base and forming a sample placement area exposing the first flushing bubble system, the air inlet, and the first clay plate mounting groove; A top cover is connected to the infiltration cylinder, wherein a second flushing bubble system and a second clay plate mounting groove are provided in the top cover, a second clay plate is mounted in the second clay plate mounting groove, and a second groove communicating with the second flushing bubble system is provided in the second clay plate mounting groove.

2. The simple unsaturated soil penetration test device according to claim 1, characterized in that: The first flushing bubble system includes a flushing bubble water inlet and a flushing bubble penetration drain outlet, and the flushing bubble water inlet and the flushing bubble penetration drain outlet are communicated with the first groove.

3. The simple unsaturated soil penetration test device according to claim 2, characterized in that: The air inlet passes through the side wall and the top surface of the base, and a permeable stone is embedded in the top surface.

4. The simple unsaturated soil penetration test device according to claim 3, characterized in that: The second flushing bubble system includes a flushing bubble drain port and a flushing bubble infiltration water inlet, and the flushing bubble drain port and the flushing bubble infiltration water inlet are communicated with the second groove.

5. The simple unsaturated soil penetration test device according to claim 4, characterized in that: The flushing bubble water inlet, the flushing bubble infiltration drain outlet, the first clay plate mounting groove, the flushing bubble drain outlet, the flushing bubble infiltration water inlet and the second clay plate mounting groove are connected to the sample placement area, and the air inlet is connected to the sample placement area through the permeable stone.

6. The simple unsaturated soil penetration test device according to claim 5, characterized in that: The first groove and the second groove both include a plurality of concentric circular grooves of gradually increasing size and a cross groove passing through the centers of the plurality of circular grooves. The flushing bubble inlet and the flushing bubble inlet are both located at the intersection of the cross grooves. The flushing bubble inlet and the flushing bubble outlet are both located at the intersection of any of the circular grooves and the cross groove.

7. The simple unsaturated soil penetration test device according to claim 6, characterized in that: The air inlet passes through the base and is located beside the first clay plate installation groove.

8. The simple unsaturated soil penetration test device according to claim 7, characterized in that: The base is provided with a cylinder installation groove for installing the permeation cylinder, and a sealing ring is connected between the base and the permeation cylinder to achieve sealing between the base and the permeation cylinder.

9. The simple unsaturated soil penetration test device according to claim 8, characterized in that: The infiltration cylinder and the top cover are installed by interference fit.

10. The simple unsaturated soil penetration test device according to claim 9, characterized in that: The first clay plate installation groove and the second clay plate installation groove are positioned opposite to each other.

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