Sample preparation device for testing specific heat capacity of soil body

Abstract

The utility model discloses a sample preparation device for testing the specific heat capacity of a soil body, which belongs to the technical field of soil body thermophysical property detection equipment, and comprises a main mold, a first mold, a second mold and a third mold, the main mold is integrally cylindrical and split, and is symmetrically divided into a first split body and a second split body along the circumferential direction of the main mold, and the first split body and the second split body are matched with each other; segmentation faces of the first split body and the second split body are correspondingly provided with semicircular-arc-shaped hole seam protrusions respectively, and the hole seam protrusions are correspondingly enclosed to form two cylinders used for generating a probe to be inserted into a hole seam when a soil sample is pressed. The inner diameter of the outer protective cylinder is matched with the outer diameter of the main mold, and the outer protective cylinder is arranged outside the first split body or the second split body in a sleeving mode; and the sample preparation device is used for pressing the soil material between the outer pile casing and the first split body or the second split body. According to the device, the aperture for inserting the probe can be preset in the pressed soil sample, so that the distance error of the probe can be reduced, and the accuracy of testing the specific heat capacity of the soil body by using the DPHP method is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of soil thermal property detection equipment, and more specifically to a sample preparation device for testing the specific heat capacity of soil. Background Art

[0002] Specific heat capacity is a key thermophysical property of soil. It represents the amount of heat absorbed or released per unit mass of soil per unit temperature change and characterizes the soil's heat storage capacity. The specific heat capacity of soil is not only a crucial parameter in underground energy structure engineering but also holds significant significance in subway ventilation calculations, buried oil and gas pipelines, underground nuclear waste disposal, freezing construction, agricultural soil conservation tillage, and irrigation and drainage design. Current geotechnical testing commonly uses the mixed calorimetry method. This method involves uniformly mixing soils of varying temperatures with a solution until they reach thermal equilibrium. During this process, the heat released by the higher-temperature object equals the heat absorbed by the lower-temperature object. The specific heat capacity of the soil can then be calculated using the law of conservation of heat. The mixed calorimetry method utilizes larger soil samples, making it highly representative of engineering projects. Furthermore, the test principle is clear and simple to perform, making it widely used for soil specific heat capacity testing. However, many researchers point out that the mixed calorimetry method is primarily applicable to materials whose specific heat capacity does not change with temperature. However, the specific heat capacity of soil is not constant at different temperatures. In reality, hybrid calorimetry measures the average specific heat capacity of soil and cannot accurately determine its actual specific heat capacity at each temperature. The average specific heat capacity obtained by traditional hybrid calorimetry cannot meet the needs of some projects requiring high precision. Therefore, it is necessary to develop a method that can accurately measure the actual specific heat capacity of soil at each temperature point.

[0003] Currently, the methods that can accurately test the specific heat capacity of soil at different temperatures mainly include differential scanning calorimetry (DSC), transient plane heat source method (TPS method) and double needle heat pulse method (DPHP method). Specifically, the DSC method is currently the most standard method for testing the specific heat capacity of soil. It is based on the comparison with the sapphire heating curve and directly calculates the specific heat capacity value of the soil to be tested at different temperatures. However, the test sample used in the DSC method is extremely small, and the conventional weight of the powder sample does not exceed 6mg. The diameter of the soil block sample it is suitable for cannot exceed 2mm and the height cannot exceed 1mm. The size of the soil block sample is too small, the sample representativeness is insufficient, and soil block samples with different moisture content and dry density are extremely difficult to prepare, which is difficult to meet the actual engineering needs.

[0004] The TPS method is widely used in soil thermophysical property testing. The test samples are large and highly representative, and three thermophysical property indicators—thermal conductivity, specific heat capacity, and thermal diffusivity—can be simultaneously determined. However, according to the test principle, in TPS testing, only thermal diffusivity and thermal conductivity can be directly calculated from temperature records. Specific heat capacity is calculated secondary from thermal diffusivity and thermal diffusivity, rather than directly from test data. Its accuracy is significantly affected by accumulated errors. Furthermore, the Hot Disk tester used in TPS is very expensive, making it difficult for ordinary geotechnical laboratories to equip it. This limits the application of this method in testing soil specific heat capacity.

[0005] The DPHP method uses the same test samples as the TPS method, but its testing principle differs. While specific heat and thermal conductivity are directly measured, thermal conductivity is calculated secondary from thermal conductivity and specific heat, effectively ensuring specific heat measurement accuracy. Furthermore, the test equipment required for the DPHP method is an order of magnitude less expensive than that required for the TPS method, making it easier to configure in geotechnical laboratories. Therefore, the DPHP method is currently the mainstream method for specific heat measurement.

[0006] However, during the probe insertion process, due to the penetration resistance of the soil block, the probe will inevitably bend, twist or deflect during the insertion process, and the initial spacing between the two probes will be changed, which will cause a large error in the specific heat capacity test. Therefore, in the test process using the thermal probe method, reducing the probe spacing error is of great significance for accurately measuring the thermal properties of the soil.

[0007] For example, the application with Chinese patent application number 201210287127.7 discloses a device and method for testing the thermal conductivity characteristics of granular materials, including a probe body, a cylinder, a lower support, an upper support and a compaction device; the lower support and the upper support are respectively threadedly connected to the cylinder; a reserved hole column is installed at the top center of the lower support; the compaction device consists of a vertical tube, a pressure plate, a plug and a lower compaction hammer; the outer diameter of the pressure plate is smaller than the inner diameter of the cylinder; a connecting groove with a thick top and a thin bottom is opened at the center of the pressure plate; the top of the connecting groove is threadedly connected to the bottom end of the vertical tube; the plug is specifically a T-shaped columnar structure, the outer diameter of its horizontal part is larger than the outer diameter of the reserved hole column and smaller than the inner diameter of the top end of the connecting groove; the outer diameter of the vertical part of the plug, the inner diameter of the bottom end of the connecting groove and the outer diameter of the reserved hole column are all the same, and are not larger than the inner diameter of the vertical tube; the lower compaction hammer is sleeved on the vertical tube. When drilling a sample, this application can solve the technical problems of damaging the probe and affecting the test accuracy due to factors such as the inclination of the hole and the difficulty in controlling the inner diameter of the hole. However, its structure is relatively complex, and the slender reserved hole column needs to be removed before testing. Utility Model Content

[0008] To address the technical issue of probe spacing errors in existing DPHP methods, which can affect the accuracy of soil specific heat capacity testing, this solution provides a sample preparation device for testing soil specific heat capacity. This soil sample preparation device utilizes a split main mold with protrusions on the split surfaces of the main mold that create holes during pressing. This device creates pre-defined holes in the pressed soil sample for probe insertion, thereby reducing probe spacing errors and improving the accuracy of soil specific heat capacity testing using the DPHP method.

[0009] In order to achieve the above-mentioned purpose, the technical solution provided by the present utility model is:

[0010] The utility model discloses a sample preparation device for testing the specific heat capacity of soil, comprising: a main mold, which is cylindrical as a whole and is a split type, and is symmetrically divided along its circumference into a first split and a second split that cooperate with each other; the dividing surfaces of the first split and the second split are respectively provided with semicircular arc-shaped hole protrusions, and the above-mentioned hole protrusions are correspondingly enclosed to form two cylinders for generating holes for inserting probes when pressing soil samples; an outer casing, the inner diameter of the outer casing matches the diameter of the main mold, and the outer casing is sleeved on the outside of the first split or the second split; and a sample maker, which is used to press the soil material between the outer casing and the first split or the second split.

[0011] Furthermore, a concave and convex mortise and tenon structure that cooperates with each other is provided between the first split body and the second split body.

[0012] Furthermore, the dividing surface of the first split body is provided with a connecting protrusion distributed in the longitudinal direction, and a first hole slit protrusion is provided on the dividing surface of the first split body on both sides of the connecting protrusion; the dividing surface of the second split body is provided with a connecting groove corresponding to the connecting protrusion, and second hole slit protrusions corresponding to the two first hole slit protrusions are provided on both sides of the connecting groove.

[0013] Furthermore, the second split body is symmetrically divided into two quarter cylinders along its circumference.

[0014] Furthermore, the sample maker includes a compactor, in which the compacting block is a semi-cylindrical structure, the diameter of the compacting block matches the diameter of the main mold, the top ends of the first hole protrusion and the connecting protrusion are lower than the upper end face of the first split, and the top end of the second hole protrusion is lower than the upper end face of the second split.

[0015] Furthermore, the sample maker also includes a compaction connecting ring, which is mounted on the outer casing and the outside of the first split or the second split in the main mold, and the inner wall of the compaction connecting ring is provided with a first connecting groove and a second connecting groove surrounding it along its circumference, wherein the inner diameter of the second connecting groove matches the diameter of the main mold, and the inner diameter of the first connecting groove matches the outer diameter of the outer casing.

[0016] Furthermore, the outer casing is of split type, comprising two half casings with the same structure.

[0017] Furthermore, the compactor also includes an operating part, a connecting part and a limiting part connected in sequence, the compacting block is arranged on the bottom surface of the limiting part, and the upper end of the first split or the second split extends out of the upper end surface of the compacting connecting ring.

[0018] Furthermore, it also includes an end guard ring, which is sleeved on the end of the outer casing. The inner wall of the end guard ring is provided with a first guard groove and a second guard groove surrounding it along its circumference. The inner diameter of the first guard groove matches the outer diameter of the outer casing, and the second guard groove is smaller than the inner diameter of the first guard groove.

[0019] Furthermore, it also includes an outer protective ring, which is sleeved on the outside of the outer protective tube and has an inner diameter that matches the outer diameter of the outer protective tube.

[0020] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0021] (1) The present invention optimizes the design of the main mold, sets it as a split type, and divides it symmetrically along its circumference into a first split and a second split that cooperate with each other. A hole slit protrusion is provided on the split surface for generating a hole slit during pressing, so that the hole slit for the probe insertion is preset in the pressed soil sample, so that the hole slit of the prepared sample is straight and parallel, thereby reducing the spacing error of the probe and improving the accuracy of the DPHP method for testing the specific heat capacity of the soil. In addition, a mutually cooperating concave and convex mortise and tenon structure is provided between the first split and the second split, which is conducive to achieving a close fit between the two prepared samples, reducing the influence of contact thermal resistance on the test results, and further improving the accuracy of the test.

[0022] (2) The present invention further optimizes the specific structure of the first split and the second split. The top of the first hole protrusion and the connecting protrusion are lower than the upper end face of the first split, and the top of the second hole protrusion is aligned with the upper end face of the second split, thereby leaving space for the compacting block to descend to a height lower than the upper end face of the first split or the second split.

[0023] (3) The present invention further optimizes the design of the sample preparation device and adds a compaction connection ring. The inner diameter of the second connection groove in the compaction connection ring matches the diameter of the first split or the second split in the main mold, and the inner diameter of the first connection groove matches the outer diameter of the outer casing. During the soil sample pressing process, it is used to limit the positional relationship between the main mold and the outer casing, thereby limiting the pressing space of the compactor on the soil material, which is conducive to the close fitting of the soil particles, thereby obtaining a complete and dense sample. On this basis, the outer casing is further optimized and designed to be split, which is composed of two half-casings with the same structure. The two half-casings are placed in the first connection groove of the compaction connection ring to enclose the two half-casings into a cylindrical curved surface. The two half-casings are easy to assemble and disassemble, thereby simplifying the sample preparation process and making it easy to remove the compacted sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the assembly structure of the sample preparation device for testing the specific heat capacity of soil in the embodiment of the utility model. Figure 1 .

[0025] Figure 2 This is a schematic diagram of the assembly structure of the sample preparation device for testing the specific heat capacity of soil in the embodiment of the utility model. Figure 2 .

[0026] Figure 3 This is a structural schematic diagram of the first sub-body in the sample preparation device for testing the specific heat capacity of soil according to an embodiment of the present utility model.

[0027] Figure 4 This is a structural schematic diagram of the second split body in the sample preparation device for testing the specific heat capacity of soil according to an embodiment of the present utility model.

[0028] Figure 5 This is a schematic structural diagram of the outer casing in a sample preparation device for testing the specific heat capacity of soil according to an embodiment of the present utility model.

[0029] Figure 6 This is a structural schematic diagram of a compactor in a sample preparation device for testing the specific heat capacity of soil according to an embodiment of the present utility model.

[0030] Figure 7 This is a schematic structural diagram of a compaction connection ring in a sample preparation device for testing the specific heat capacity of soil according to an embodiment of the present utility model.

[0031] Figure 8 This is a schematic structural diagram of the end guard ring in the sample preparation device for testing the specific heat capacity of soil according to an embodiment of the present utility model.

[0032] Figure 9 This is a schematic structural diagram of the outer guard ring in the sample preparation device for testing the specific heat capacity of soil according to an embodiment of the present utility model.

[0033] Description of labels:

[0034] 1. First split body; 101. First aperture protrusion; 102. Connecting protrusion;

[0035] 2. Second split body; 201. Second aperture protrusion; 202. Connecting groove;

[0036] 3. Outer casing;

[0037] 4. Compactor; 401. Operating unit; 402. Connecting unit; 403. Position limiting unit; 404. Compacting block;

[0038] 5. Compact the connecting ring; 501. First connecting groove; 502. Second connecting groove;

[0039] 6. End guard ring; 601. First guard groove; 602. Second guard groove;

[0040] 7. External guard ring. DETAILED DESCRIPTION

[0041] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0042] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology. They are not used to limit the conditions for implementation of the present invention and therefore have no substantial technical significance. Any modification of the structure, change in the proportion relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present utility model without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", and "middle" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0043] Regarding the description of directions, the “longitudinal direction” described in the following embodiments refers to the “direction along the axis of the main mold”.

[0044] This embodiment provides a sample preparation device for testing the specific heat capacity of soil. Figure 3 、 Figure 4As shown, the device comprises a main mold, an outer casing 3, and a sample preparation device. The main mold is cylindrical and split, symmetrically divided along its circumference into a first and second sub-sections 1 and 2 that fit together. The circumference refers to the direction along the outer curved surface of the main mold. The resulting first and second sub-sections 1 and 2 are both semi-cylindrical structures, with the dividing plane between them being a vertical plane running through the axis of the main mold. The dividing planes of the first and second sub-sections 1 and 2 are each provided with a semi-circular aperture protrusion. These aperture protrusions enclose two cylindrical sections that create apertures for a probe to insert when pressing a soil sample. The two cylinders are parallel to each other, and the apertures they create match the size of the probe. In the sample preparation device, the inner diameter of the outer casing 3 matches the diameter of the main mold. It fits over the exterior of the first or second sub-section 1 or 2 to form the cavity required for sample pressing. The sample preparation device is used to press the soil material between the outer casing 3 and the first or second sub-section 1 or 2.

[0045] More preferably, Figure 3 、 Figure 4 As shown, a concave and convex mortise and tenon structure that cooperates with each other is provided between the first split body 1 and the second split body 2, thereby improving the tightness of the fit between the two samples prepared using the first split body 1 and the second split body 2 respectively, reducing the influence of contact thermal resistance on the test results, and improving the accuracy of the test.

[0046] Specifically, the dividing surface of the first body 1 is provided with a connecting protrusion 102 distributed longitudinally, and a first aperture protrusion 101 is provided on each side of the connecting protrusion 102 on the dividing surface of the first body 1; the dividing surface of the second body 2 is provided with a connecting groove 202 corresponding to the connecting protrusion 102, and a second aperture protrusion 201 corresponding to each of the two first aperture protrusions 101 is provided on each side of the connecting groove 202. The first aperture protrusion 101 and the second aperture protrusion 201 enclose a cylindrical body for inserting a probe into the aperture when pressing the soil sample. More specifically, the first aperture protrusion 101 and the second aperture protrusion 201 are both semi-cylindrical structures, making the prepared sample easy to remove, reducing the difficulty of the sample preparation process, and at the same time making the apertures of the prepared sample straight and parallel, reducing the spacing error of the probes and improving the test accuracy.

[0047] As a preferred embodiment of the second split body 2 , the second split body 2 is symmetrically divided into two quarter-cylinder structures along its circumference.

[0048] As a preferred embodiment of the sample preparation device, Figure 6As shown, the sample maker includes a compactor 4, in which the compacting block 404 is a semi-cylindrical structure. The outer diameter of the compacting block 404 matches the diameter of the main mold. The top ends of the first hole protrusion 101 and the connecting protrusion 102 are both lower than the upper end face of the first sub-body 1, and the top end of the second hole protrusion 201 is lower than the upper end face of the second sub-body 2, thereby allowing the compacting block 404 to descend to below the upper end face of the first sub-body 1 or the second sub-body 2. The space required is conducive to the compacting block 404 fitting closely with the soil particles, thereby obtaining a complete and dense sample.

[0049] In some embodiments, as Figure 7 As shown, the sample preparation device also includes a compacting connection ring 5, the inner wall of which is provided with a first connection groove 501 and a second connection groove 502 circumferentially extending therefrom. The inner diameter of the second connection groove 502 matches the diameter of the main mold, while the inner diameter of the first connection groove 501 matches the outer diameter of the outer casing 3. During sample preparation, the compacting connection ring 5 is fitted over the outer casing 3 and the exterior of the first sub-body 1 or the second sub-body 2 in the main mold to define the positional relationship between the outer casing 3 and the first sub-body 1 or the second sub-body 2 in the main mold. During subsequent testing, this helps to ensure a tight fit between the outer casing 3 and the sample, reducing the impact of contact thermal resistance on test results. It also facilitates sealing the sample to prevent moisture evaporation during testing, thereby improving the accuracy of test results.

[0050] More preferably, Figure 5 As shown, the outer casing 3 is a split type, which includes two half-casings with the same structure. The two half-casings are placed in the first connecting groove 501 of the compacting connecting ring 5 to enclose the two half-casings into a cylindrical curved surface. The two half-casings are easy to assemble and disassemble, thereby simplifying the sample preparation process and facilitating the removal of the sample.

[0051] In other embodiments, the compactor 4 further includes an operating portion 401, a connecting portion 402, and a limiting portion 403, which are sequentially connected. A compacting block 404 is disposed on the bottom surface of the limiting portion 403. The operating portion 401, the connecting portion 402, and the limiting portion 403 are arranged in an I-shape to facilitate gripping and operation. The limiting portion 403 is a flat cylindrical structure with an outer diameter larger than that of the compacting block 404. The compacting block 404 is offset from the bottom surface of the limiting portion 403, and the upper end of the first sub-body 1 or the second sub-body 2 extends beyond the upper end surface of the compacting connecting ring 5. During the downward movement of the compactor 4, if the limiting portion 403 contacts the upper end surface of the first sub-body 1 or the second sub-body 2, the compactor 4 will be unable to continue its downward movement.

[0052] In order to limit the outer casing 3 and its internal sample, as Figure 8As shown, it also includes an end guard ring 6, the inner wall of the end guard ring 6 is provided with a first guard groove 601 and a second guard groove 602 surrounding the inner wall thereof. The inner diameter of the first guard groove 601 matches the outer diameter of the outer casing 3, and the second guard groove 602 is smaller than the inner diameter of the first guard groove 601, so as to form a slot at the connection between the two. The end guard ring 6 is sleeved on the end of the outer casing 3 to limit the outer casing 3 and the sample inside it, thereby facilitating a close fit between the outer casing 3 and the sample inside it.

[0053] More preferably, Figure 9 As shown, it also includes an outer protective ring 7, whose inner diameter matches the outer diameter of the outer casing 3. The number of outer protective rings 7 can be set to two, and the two outer protective rings 7 are distributed along the longitudinal direction and sleeved on the outside of the outer casing 3 to limit the outer casing and the sample inside, thereby facilitating a close fit between the outer casing 3 and the sample inside.

[0054] As a preferred implementation of any of the above embodiments, the first split body 1 or the second split body 2 is made using 3D printing technology, so that the main mold has higher precision.

[0055] Before preparing the sample, calculate the amount of wet soil required at a fixed dry density.

[0056] like Figure 1 As shown, the specific sample preparation process includes the following steps: (1) placing the compacted connecting ring 5 on the upper end of the outer casing 3, and then padding the bottom and inner wall of the outer casing 3 with a whole plastic film;

[0057] (2) Place the first sub-body 1 in the outer casing 3, and then place the wet soil material into the cavity of the outer casing 3 padded with a film;

[0058] (3) Using a compactor 4, the wet soil material is pressed into a sample by static pressure. After the sample is pressed, the excess film on the upper edge of the casing 3 is cut off to obtain the first sample;

[0059] (4) Take out the first sample, and then use the second split body 2 to make a second sample according to the above steps.

[0060] Based on this, two compacted soil samples were obtained, and except for the upper surface, they were tightly covered with plastic film and well sealed. Figure 2 As shown, the holes of the first sample and the second sample are aligned, and then the entire plastic film is covered on the upper surface of the sample. After that, the sample is placed in the outer casing 3. Subsequently, two outer protective rings 7 are taken and clamped on the outside of the outer casing 3, so that the two samples are confined inside the outer casing 3, thereby achieving the limitation of the outer curved surface of the soil sample; finally, two end protective rings 6 are taken, and the plastic film is connected to the first protective groove 601 and pressed into the upper and lower ends of the outer casing 3, thereby achieving the limitation of the upper and lower surfaces of the soil sample and covering the film, thereby obtaining a well-sealed soil sample with two holes.

[0061] The device optimizes the design of the outer casing 3, the main mold, the sample preparation device, the end retaining ring 6 and the outer retaining ring 7 to prepare a sample with straight and parallel holes and seams. When applied to the DPHP method test, it can ensure the stability of the probe spacing, reduce the error in the measurement of the specific heat capacity of the soil, and improve the accuracy of the test.

[0062] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A sample preparation device for testing soil specific heat capacity, characterized in that: include: A main mold, wherein the main mold is cylindrical and split, and is symmetrically divided along its circumference into a first split (1) and a second split (2) that cooperate with each other; the split surfaces of the first split (1) and the second split (2) are respectively provided with semicircular arc-shaped hole protrusions, and the above-mentioned hole protrusions are correspondingly enclosed to form two cylindrical bodies for generating a hole for inserting a probe when pressing a soil sample; An outer casing (3), the inner diameter of which matches the diameter of the main mold, and which is mounted on the outside of the first sub-body (1) or the second sub-body (2); A sample maker is used to press the soil material between the outer casing (3) and the first sub-body (1) or the second sub-body (2).

2. The sample preparation device for testing soil specific heat capacity according to claim 1, characterized in that: A concave and convex mortise and tenon structure that cooperates with each other is also provided between the first split body (1) and the second split body (2).

3. The sample preparation device for testing soil specific heat capacity according to claim 2, characterized in that: A connecting protrusion (102) distributed in the longitudinal direction is provided on the dividing surface of the first split body (1), and a first hole protrusion (101) is provided on each side of the connecting protrusion (102) on the dividing surface of the first split body (1); A connecting groove (202) corresponding to the connecting protrusion (102) is provided on the dividing surface of the second split body (2), and second aperture protrusions (201) corresponding to the two first aperture protrusions (101) are provided on both sides of the connecting groove (202).

4. The sample preparation device for testing soil specific heat capacity according to claim 3, characterized in that: The second split body (2) is symmetrically divided into two quarter-cylinder structures along its circumference.

5. The sample preparation device for testing soil specific heat capacity according to claim 3, characterized in that: The sample preparation device comprises A compactor (4), wherein the compacting block (404) in the compactor (4) is a semi-cylindrical structure, the diameter of the compacting block (404) matches the diameter of the main mold, the top ends of the first aperture protrusion (101) and the connecting protrusion (102) are both lower than the upper end surface of the first sub-body (1), and the top end of the second aperture protrusion (201) is lower than the upper end surface of the second sub-body (2).

6. The sample preparation device for testing soil specific heat capacity according to claim 5, characterized in that: The compactor (4) further comprises an operating portion (401), a connecting portion (402) and a limiting portion (403) connected in sequence, a compacting block (404) being arranged on the bottom surface of the limiting portion (403), and the upper end of the first split body (1) or the second split body (2) extending out of the upper end surface of the compacting connecting ring (5).

7. The sample preparation device for testing soil specific heat capacity according to any one of claims 1 to 6, characterized in that: The sample maker further comprises a compaction connection ring (5), which is fitted onto the outer casing (3) and the first sub-body (1) or the second sub-body (2) in the main mold, and an inner wall of the compaction connection ring (5) is provided with a first connection groove (501) and a second connection groove (502) surrounding the inner wall thereof, wherein the inner diameter of the second connection groove (502) matches the diameter of the main mold, and the inner diameter of the first connection groove (501) matches the outer diameter of the outer casing (3).

8. The sample preparation device for testing soil specific heat capacity according to claim 7, characterized in that: The outer casing (3) is of split type and comprises two half casings with the same structure.

9. The sample preparation device for testing soil specific heat capacity according to any one of claims 1 to 6, characterized in that: The invention also includes an end protective ring (6), which is sleeved on the end of the outer casing (3). The inner wall of the end protective ring (6) is provided with a first protective groove (601) and a second protective groove (602) surrounding the inner wall of the end protective ring (6). The inner diameter of the first protective groove (601) matches the outer diameter of the outer casing (3), and the second protective groove (602) is smaller than the inner diameter of the first protective groove (601).

10. The sample preparation device for testing soil specific heat capacity according to claim 9, characterized in that: It also includes an outer protective ring (7), which is sleeved on the outside of the outer protective tube (3), and the inner diameter of the outer protective ring (7) matches the outer diameter of the outer protective tube (3).

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