Resistivity-based soil sample saturation testing device and method

Abstract

The invention belongs to the technical field of geotechnical engineering test equipment, and discloses a resistivity-based soil sample saturation testing device and method.The resistivity-based soil sample saturation testing device comprises a top cover arranged on the top surface of a sample, the top surface of the top cover is connected with a dowel bar, and at least one first via hole is formed in the top surface of the top cover; the detection end of the resistivity detection unit extends into the sample through the first via hole, and the other end of the resistivity detection unit extends out of the confining pressure chamber through the second via hole; wherein the detection end comprises a first electrode and a second electrode, and is configured to detect the resistivity of the sample between the first electrode and the second electrode; the extension sleeve is arranged on the outer side of the resistivity detection unit in a sleeving manner, and the inner wall of the extension sleeve is in threaded connection with the outer wall of the resistivity detection unit. According to the invention, the resistivity detection unit can be arranged in the sample, and resistivity detection can be carried out on the sample through the resistivity detection unit, so that the saturation of the sample is determined.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of geotechnical engineering test equipment, and particularly relates to a soil sample saturation degree testing device and method based on resistivity. BACKGROUND

[0002] At present, when a geotechnical indoor unit test is performed, a vacuum is drawn on the outside confining pressure chamber, the top surface of the sample and the bottom surface of the sample, and the vacuum degrees of the outside confining pressure chamber, the top surface of the sample and the bottom surface of the sample are controlled to have differences, so as to remove the air bubbles in the sample, thereby realizing saturation of the sample.

[0003] However, although the above method can remove the air bubbles, the saturation degree of the sample cannot be monitored in real time in the actual test process, so that the sample cannot be saturated by the vacuum saturation method to study the influence of the saturation degree on the mechanical properties of the soil sample.

[0004] Therefore, the soil sample saturation degree testing device and method based on resistivity are provided to solve the above problems. SUMMARY

[0005] To solve the above technical problems, the soil sample saturation degree testing device and method based on resistivity are provided, which can realize the arrangement of the resistivity detection unit in the sample, the resistivity detection of the sample by the resistivity detection unit, and the determination of the saturation degree of the sample.

[0006] To achieve the above purpose, the soil sample saturation degree testing device based on resistivity is provided, which comprises:

[0007] The top cover is arranged on the top surface of the sample, the top surface of the top cover is connected with the force transmission rod, and at least one first through hole is formed in the top surface of the top cover.

[0008] The resistivity detection unit has a detection end which extends into the sample through the first through hole, and the other end of the resistivity detection unit extends out of the confining pressure chamber through a second through hole.

[0009] The detection end comprises a first electrode and a second electrode, and is configured to detect the resistivity of the sample between the first electrode and the second electrode.

[0010] Further, the extension sleeve is sleeved outside the resistivity detection unit, the inner wall of the extension sleeve is threadedly connected with the outer wall of the resistivity detection unit, and the resistivity detection unit extends out of one end of the extension sleeve.

[0011] Further, the positioning column is arranged at the other end of the extension sleeve, the wires of the first electrode and the second electrode both pass through the extension sleeve,

[0012] A rotating ring is fixed to the outer wall of the positioning column, a rotating groove is formed in the inner wall of the extension sleeve, the rotating ring is located in the rotating groove, and the rotating groove is rotationally connected with the extension sleeve;

[0013] A polygonal plate is fixed to the bottom end of the positioning column, the other end of the polygonal plate extends into the resistivity detection unit and is in sliding fit with the resistivity detection unit.

[0014] Further, the resistivity detection unit comprises an insertion column configured to be inserted into the sample, and the first electrode and the second electrode are fixed to one end of the insertion column.

[0015] Further, the bottom cover is fixed to the inner wall of the bottom end of the confining pressure chamber, and the sample is arranged on the top surface of the bottom cover.

[0016] A pair of clamping sleeves are respectively connected to the top cover and the bottom cover, and the adhesive film outside the sample is fixed to the outer walls of the top cover and the bottom cover through the clamping sleeves.

[0017] Further, the clamping sleeve comprises a first ring body fixed to the top cover and the bottom cover, a pair of second ring bodies are respectively fixed to the ends of the first ring bodies, and a gap is arranged between the inner wall of the second ring body and the top cover.

[0018] An adhesive pad is sleeved on the top cover and located in the gap.

[0019] An extrusion ring is sleeved on the end of the second ring body away from the first ring body, the extrusion ring is threadedly connected with the second ring body, and the extrusion ring is configured to extrude the adhesive pad to deform the adhesive pad and fix the adhesive film.

[0020] Further, the first vacuum pipe is arranged to extend into one of the first through holes and communicate with the top surface of the sample, and the first vacuum pipe extends out of the confining pressure chamber through one of the second through holes.

[0021] A second vacuum pipe has an input end penetrating the bottom cover and communicating with the bottom surface of the sample.

[0022] A third vacuum pipe has an input end penetrating another second through hole and communicating with the confining pressure chamber.

[0023] Further, a pair of water permeable plates are arranged on the bottom surface of the sample and the top surface of the sample.

[0024] Further, the first plugging column is configured to plug the first through hole.

[0025] The second plugging column is configured to plug the second through hole.

[0026] A kind of soil sample saturation test method based on resistivity, operation steps include:

[0027] Rotary extension sleeve adjusts resistivity detection unit length;

[0028] Resistivity detection unit is inserted to second via, and the detection end of resistivity detection unit is inserted into sample through first via;

[0029] First vacuum pipe, second vacuum pipe, third vacuum pipe are started, and resistivity detection unit display data is observed.

[0030] Compared with prior art, the present application has the following advantages and technical effects:

[0031] First electrode and second electrode are arranged in sample, and the detection of sample resistivity is realized by the cooperation of first electrode and second electrode, and the saturation of sample is determined by resistivity data feedback. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and its description are used to explain the present application, and do not constitute improper limitation to the present application. In the drawings:

[0033] Figure 1 It is the perspective view of testing device;

[0034] Figure 2 It is the sectional view of confining pressure chamber;

[0035] Figure 3 It is the sectional view of rubber sleeve and hoop sleeve connection;

[0036] Figure 4 It is the sectional view of sample and insertion column connection;

[0037] Figure 5 It is the sectional view of extension sleeve and insertion column connection;

[0038] Figure 6 It is the sectional view of gas distribution pipe;

[0039] Wherein, 1 - top cover, 2 - sample, 3 - force bar, 4 - first via, 5 - second via, 6 - first electrode, 7 - second electrode, 8 - extension sleeve, 9 - positioning column, 10 - rotating ring, 11 - polygonal plate, 12 - insertion column, 13 - bottom cover, 14 - adhesive film, 15 - first ring body, 16 - second ring body, 17 - rubber pad, 18 - extrusion ring, 19 - first vacuum tube, 20 - second vacuum tube, 21 - third vacuum tube, 22 - water-permeable plate, 23 - first plugging column, 24 - second plugging column, 25 - water-permeable head, 26 - confining pressure chamber, 27 - gas distribution pipe, 28 - partition plate, 29 - first chamber, 30 - second chamber, 31 - third chamber, 32 - rotating rod, 33 - blocking plate, 34 - vacuum pump. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0042] Reference Figures 1-6 The present application provides a kind of based on resistivity of soil sample saturation test device, comprising: top cover 1, it is arranged in the top surface of sample 2, top cover 1 top surface is connected with force bar 3, top cover 1 top surface is opened with at least one first via 4;Resistivity detection unit, detection end by first via 4 extends into sample 2, another end of resistivity detection unit extends out confining pressure chamber 26 by second via 5;Wherein, detection end includes first electrode 6 and second electrode 7, is configured as the resistivity of sample 2 between first electrode 6 and second electrode 7 is detected.

[0043] Specificly, sample 2 is arranged in confining pressure chamber 26, top cover 1 is arranged on the top surface of sample 2, axial pressure can be applied to sample 2 by force bar 3, meanwhile, a plurality of first via 4 are arranged on top cover 1, the first via 4 can be passed through by resistivity detection unit, so that first electrode 6 and second electrode 7 extend into sample 2, realize the resistivity detection of sample 2, and another end of resistivity detection unit extends out confining pressure chamber 26 by second via 5, and it is guaranteed that confining pressure chamber 26 is sealed, to facilitate subsequent vacuum operation.

[0044] Further, the lead of first electrode 6 and second electrode 7 is connected with display device, to present resistivity data for easy observation.

[0045] Specifically, the insertion column 12 is used as a sleeve of the first electrode 6 and the second electrode 7, so that the first electrode 6 and the second electrode 7 are fixed together, and the distance between the first electrode 6 and the second electrode 7 is determined, which ensures the accuracy of the resistivity test data when multiple resistivity detection units are arranged, and ensures good sealing under the action of the insertion column 12.

[0046] Specifically, when testing the resistivity, the first electrode 6 and the second electrode 7 are powered through the wires, and the first electrode 6 and the second electrode 7 are connected to the resistivity measuring instrument, which is the display device described above. The resistivity measuring instrument calculates and displays the data, and the resistivity value between the first electrode 6 and the second electrode 7 can be obtained.

[0047] In further embodiments, with reference to Figure 4 、 Figure 5 Further comprising: an extension sleeve 8, sleeved outside the resistivity detection unit, and the inner wall is threadedly connected with the outer wall of the resistivity detection unit, and the resistivity detection unit is extended from one end of the extension sleeve 8.

[0048] Specifically, the extension sleeve 8 is used in cooperation with the resistivity detection unit, which is used to adjust the length of the resistivity detection unit, so that the depth of the resistivity detection unit inserted into the sample 2 is adjustable.

[0049] In specific use, multiple resistivity detection units can be arranged, each resistivity detection unit passes through a first via hole 4, and the depths of the multiple resistivity detection units in the sample 2 are different, so as to realize resistivity detection at different depths of the sample 2.

[0050] In specific use, the extension sleeve 8 can pass through the first via hole 4 and the second via hole 5, and threads are arranged on the outer wall of the extension sleeve 8, so that the extension sleeve 8 is threadedly connected with the first via hole 4 and the second via hole 5. On the one hand, the extension sleeve 8 is fixed with the top cover 1 and the confining pressure chamber 26, and on the other hand, the sealing effect of the confining pressure chamber 26 can be ensured.

[0051] In further embodiments, with reference to Figure 5 Further comprising: a positioning column 9 arranged at the other end of the extension sleeve 8, the wires of the first electrode 6 and the second electrode 7 both pass through the extension sleeve 8, a rotating ring 10 fixed on the outer wall of the positioning column 9, a rotating groove is arranged on the inner wall of the extension sleeve 8, the rotating ring 10 is located in the rotating groove and is rotatably connected with the extension sleeve 8 through the rotating groove; a polygonal plate 11 fixed at the bottom end of the positioning column 9, the other end of the polygonal plate 11 extends into the resistivity detection unit and is slidably connected with the resistivity detection unit.

[0052] Specifically, in order to position the wire and facilitate its extension out of the confining chamber 26, a positioning post 9 is rotatably connected to the top of the extension sleeve 8. The wire passes through the positioning post 9 and is slidably connected to the positioning post 9 so that the wire can be used normally when the overall length of the resistivity detection unit and the extension sleeve 8 changes.

[0053] Among them, a polygonal plate 11 is provided on the positioning post 9, which is used to limit the positioning post 9. That is, when changing the overall length of the resistivity detection unit and the extension sleeve 8, one hand grasps the resistivity detection unit and the other hand rotates the extension sleeve 8 to realize the rotation of the extension sleeve 8 relative to the resistivity detection unit, thereby changing the overall length of the resistivity detection unit and the extension sleeve 8.

[0054] In a further embodiment, refer to Figure 4 , Figure 5 The resistivity detection unit includes an insertion post 12, which is configured to be inserted into the sample 2, and one end of which is fixed with a first electrode 6 and a second electrode 7.

[0055] Specifically, the insertion post 12 is a rod structure, which is used to pass through the first through hole 4 and extend into the sample 2 so that the first electrode 6 and the second electrode 7 can extend into the sample 2.

[0056] In a further embodiment, refer to Figure 2 , Figure 3 It also includes: a bottom cover 13, fixed to the inner wall of the bottom end of the confining pressure chamber 26, with the sample 2 placed on the top surface of the bottom cover 13; a pair of hoops, respectively connected to the top cover 1 and the bottom cover 13, with the adhesive film 14 on the outside of the sample 2 fixed to the outer wall of the top cover 1 and the outer wall of the bottom cover 13 respectively through the hoops.

[0057] Specifically, during the test, a film 14 needs to be wrapped around the sample 2 to fix the film 14 to the top cover 1 and the bottom cover 13. The conventional fixing method is to use a rubber band, but this method is cumbersome and the fixing effect is poor. Therefore, a clamp is set to fix the film 14 to the top cover 1 and the bottom cover 13.

[0058] In a further embodiment, refer to Figure 3 The sleeve includes: a first ring body 15, which is sleeved and fixed on the top cover 1 and the bottom cover 13; a pair of first ring bodies 15 are respectively fixed with second ring bodies 16 at their close ends; a gap is provided between the inner wall of the second ring body 16 and the top cover 1; a rubber pad 17, which is sleeved on the top cover 1 and located in the gap; and a compression ring 18, which is sleeved on the end of the second ring body 16 away from the first ring body 15; the compression ring 18 is threadedly connected to the second ring body 16; and the compression ring 18 is configured to compress the rubber pad 17 so that the rubber pad 17 deforms and fixes the rubber film 14.

[0059] Specifically, when placing sample 2, sample 2 covered with adhesive film 14 is placed on the top surface of bottom cover 13, and then top cover 1 is placed on the top surface of sample 2. At this time, compression ring 18 is connected to second ring body 16 and does not compress adhesive pad 17, so that adhesive pad 17 shrinks and does not contact adhesive film 14 or does not apply force to adhesive film 14. After top cover 1 is installed, compression ring 18 is rotated so that compression ring 18 compresses adhesive pad 17, adhesive pad 17 expands and compresses adhesive film 14, thereby fixing adhesive film 14 to top cover 1 and bottom cover 13.

[0060] In a further embodiment, refer to Figure 1 , Figure 2 It also includes: a first vacuum tube 19. When there are two or more first through holes 4, the input end of the first vacuum tube 19 extends into a first through hole 4 and communicates with the top surface of the sample 2. The first vacuum tube 19 extends out of the confining pressure chamber 26 through a second through hole 5.

[0061] The first through hole 4 can be used to insert the input end of the first vacuum tube 19. The first vacuum tube 19 can extend out of the confining pressure chamber 26 through a second through hole 5 to facilitate the installation of the first vacuum tube 19.

[0062] The second vacuum tube 20 has its input end passing through the bottom cover 13 and communicating with the bottom surface of the sample 2; the third vacuum tube 21 has its input end communicating with the confining pressure chamber 26 through another second through hole 5.

[0063] One of the second through holes 5 can be used as a vacuum channel for the confining pressure chamber 26, that is, the input end of the third vacuum tube 21 is connected to the confining pressure chamber 26 through the second through hole 5.

[0064] Furthermore, refer to Figure 1 , Figure 2 , Figure 6 It also includes a gas distribution pipe 27, which has three partitions 28 fixed inside to divide the gas distribution pipe 27 into a first chamber 29, a second chamber 30, and a third chamber 31. The output openings of the first chamber 29 and the second chamber 30 are of equal size, and the output opening of the third chamber 31 is smaller than the output openings of the first chamber 29 and the second chamber 30. The first vacuum tube 19 is connected to the first chamber 29, the second vacuum tube 20 is connected to the second chamber 30, and the third vacuum tube 21 is connected to the third chamber 31.

[0065] A rotating rod 32 is rotatably connected to the axis of the gas distribution pipe 27. A blocking plate 33 is fixed on the rotating rod 32. The blocking plate 33 is configured to block the first chamber 29 and the second chamber 30 so that the opening sizes of the output ends of the first chamber 29 and the second chamber 30 are different.

[0066] With this structure, when vacuuming, the vacuuming force of the third vacuum tube 21 is less than that of the first vacuum tube 19 and the second vacuum tube 20. By changing the position of the blocking plate 33 through the rotating rod 32, the vacuuming forces of the first vacuum tube 19 and the second vacuum tube 20 are different, so as to achieve vacuuming of the top surface of the sample 2, the bottom surface of the sample 2, and the confining pressure chamber 26.

[0067] Furthermore, refer to Figure 1 , Figure 2 It also includes a vacuum pump 34, whose input end is connected to the output end of the gas distribution pipe 27.

[0068] In a further embodiment, refer to Figure 3 It also includes a pair of permeable plates 22, which are respectively set on the bottom surface and the top surface of the sample 2.

[0069] Specifically, the permeable plate 22 is encased in the membrane 14 and is located between the top of the sample 2 and the bottom of the top cover 1, and between the bottom of the sample 2 and the top of the bottom cover 13, respectively, to prevent the soil inside the sample 2 from being lost.

[0070] Furthermore, a permeable head 25 is connected to the input end of the first vacuum tube 19. The permeable head 25 enables gas flow while preventing soil erosion.

[0071] In a further embodiment, refer to Figure 1 , Figure 2 , Figure 3 It also includes: a first sealing post 23, configured to seal the first through hole 4; and a second sealing post 24, configured to seal the second through hole 5.

[0072] Specifically, during the experiment, some of the first through-hole 4 and the second through-hole 5 were not needed, so the first sealing post 23 and the second sealing post 24 were set up to seal them.

[0073] A method for testing soil saturation based on resistivity, comprising the following steps:

[0074] S1. Prepare sample 2, cover sample 2 with adhesive film 14, place sample 2 on bottom cover 13, then place top cover 1 on top surface of sample 2, and finally fix adhesive film 14.

[0075] S2, Rotate the extension sleeve 8 to adjust the length of the resistivity detection unit.

[0076] Adjust the overall length of the extension sleeve 8 and the insertion post 12 according to the placement depth of the first electrode 6 and the second electrode 7.

[0077] S3. Insert the resistivity detection unit into the second through hole 5. The detection end of the resistivity detection unit passes through the first through hole 4 and extends into the sample 2.

[0078] Then, the insertion post 12 is inserted into the second through hole 5. The insertion post 12 passes through the first through hole 4 and extends into the sample 2, and fixes the extension sleeve 8 to the top cover 1 and the confining pressure chamber 26.

[0079] S4. Start the first vacuum tube 19, the second vacuum tube 20, and the third vacuum tube 21, and observe the data displayed by the resistivity detection unit.

[0080] Among them, the resistivity and saturation of sand, loess and clay are related as follows: resistivity decreases as saturation increases. When the soil sample is close to saturation, the current is almost entirely conducted through pore water, and the resistivity of the soil sample tends to stabilize. When the porosity of the soil sample is the same, the resistivity and saturation of the soil sample have a power function relationship. Based on this relationship, the resistivity and saturation power function relationship of the soil sample to be studied is calibrated, and the relevant parameters are determined. The saturation can then be judged by directly testing the resistivity of the soil sample.

[0081] Generally, when the saturation degree of sand is between 18% and 40%, the resistivity is 420–225 Ω·m. When the saturation degree is greater than 60%, the resistivity decreases in sensitivity to saturation, eventually approaching 148 Ω·m. When the saturation degree of loess is between 10% and 40%, the resistivity of loess is 90–56 Ω·m, and that of clay is 70–43 Ω·m. When the saturation degree is greater than 60%, the resistivity of both approaches 22 Ω·m.

[0082] Start the vacuum pump 34 to perform the first vacuuming, so that the vacuum degree of the top surface of sample 2 is greater than that of the confining pressure chamber 26, the vacuum degree of the bottom surface of sample 2 is greater than that of the confining pressure chamber 26, and the vacuum degree of the top surface of sample 2 is not equal to that of the bottom surface of sample 2.

[0083] Change the vacuum pump to setting 34 to perform a second vacuuming operation. The vacuuming force is greater than that of the first vacuuming operation, so that the vacuum level of the top surface of sample 2 is greater than that of the confining pressure chamber 26, the vacuum level of the bottom surface of sample 2 is greater than that of the confining pressure chamber 26, and the vacuum level of the top surface of sample 2 is not equal to that of the bottom surface of sample 2.

[0084] During the above process, the change in resistivity was observed to determine the saturation of sample 2.

[0085] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A soil sample saturation testing device based on resistivity, characterized in that: include: A top cover (1) is provided on the top surface of the sample (2). A force transmission rod (3) is connected to the top surface of the top cover (1). At least one first through hole (4) is provided on the top surface of the top cover (1). The resistivity detection unit has its detection end extending into the sample (2) through the first through hole (4), and the other end of the resistivity detection unit extends out of the confining pressure chamber (26) through the second through hole (5). The detection end includes a first electrode (6) and a second electrode (7), and is configured to detect the resistivity of the sample (2) between the first electrode (6) and the second electrode (7).

2. The soil sample saturation testing device based on resistivity according to claim 1, characterized in that: Also includes: An extension sleeve (8) is fitted on the outside of the resistivity detection unit, and its inner wall is threaded to the outer wall of the resistivity detection unit. The resistivity detection unit extends out from one end of the extension sleeve (8).

3. The soil sample saturation testing device based on resistivity according to claim 2, characterized in that: Also includes: A positioning post (9) is provided at the other end of the extension sleeve (8), and the wires of the first electrode (6) and the second electrode (7) both pass through the extension sleeve (8). A rotating ring (10) is fixed on the outer wall of the positioning post (9). A rotating groove is provided on the inner wall of the extension sleeve (8). The rotating ring (10) is located in the rotating groove and is rotatably connected to the extension sleeve (8) through the rotating groove. A polygonal plate (11) is fixed at the bottom of the positioning post (9), and the other end of the polygonal plate (11) extends into the resistivity detection unit and slides with the resistivity detection unit.

4. The soil sample saturation testing device based on resistivity according to claim 1, characterized in that: The resistivity detection unit includes an insertion post (12) configured to be inserted into the sample (2), and one end of which is fixed with the first electrode (6) and the second electrode (7).

5. The soil sample saturation testing device based on resistivity according to claim 1, characterized in that: Also includes: The bottom cover (13) is fixed to the inner wall of the bottom end of the confining chamber (26), and the sample (2) is placed on the top surface of the bottom cover (13); A pair of sleeves are connected to the top cover (1) and the bottom cover (13) respectively. The adhesive film (14) on the outside of the sample (2) is fixed to the outer wall of the top cover (1) and the outer wall of the bottom cover (13) respectively through the sleeves.

6. The soil sample saturation testing device based on resistivity according to claim 5, characterized in that: The hoop includes: a first ring body (15), which is sleeved and fixed on the top cover (1) and the bottom cover (13); a pair of first ring bodies (15) are respectively fixed with second ring bodies (16) at their close ends; and a gap is provided between the inner wall of the second ring body (16) and the top cover (1). A rubber pad (17) is fitted onto the top cover (1) and located within the gap; A compression ring (18) is sleeved on the end of the second ring body (16) away from the first ring body (15). The compression ring (18) is threadedly connected to the second ring body (16). The compression ring (18) is configured to compress the rubber pad (17) so that the rubber pad (17) deforms and fixes the rubber film (14).

7. The soil sample saturation testing device based on resistivity according to claim 5, characterized in that: Also includes: When there are two or more first through holes (4), the input end of the first vacuum tube (19) extends into a first through hole (4) and communicates with the top surface of the sample (2), and the first vacuum tube (19) extends out of the confining pressure chamber (26) through a second through hole (5). The second vacuum tube (20) has its input end passing through the bottom cover (13) and communicating with the bottom surface of the sample (2); The third vacuum tube (21) is connected to the confining pressure chamber (26) through another second through hole (5) at its input end.

8. The soil sample saturation testing device based on resistivity according to claim 1, characterized in that: It also includes a pair of permeable plates (22), which are respectively disposed on the bottom surface and the top surface of the sample (2).

9. The soil sample saturation testing device based on resistivity according to claim 1, characterized in that: Also includes: The first sealing post (23) is configured to seal the first through hole (4); The second plug (24) is configured to plug the second through hole (5).

10. A method for testing soil saturation based on resistivity, using the soil saturation testing device based on resistivity according to claim 5, characterized in that: The operating steps include: Rotate the extension sleeve (8) to adjust the length of the resistivity detection unit; Insert the resistivity detection unit into the second through hole (5), and the detection end of the resistivity detection unit extends into the sample (2) through the first through hole (4); Start the first vacuum tube (19), the second vacuum tube (20), and the third vacuum tube (21), and observe the data displayed by the resistivity detection unit.

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