Sample preparation equipment and sample preparation method

Abstract

The present invention discloses a sample preparation device and a sample preparation method. The sample preparation device comprises a cylindrical structure having a hollow inner cavity, the cylindrical structure comprising a first end and a second end disposed oppositely along the axis of the cylindrical structure. The sample preparation device comprises a first mold cylinder, a second mold cylinder, and a curved plate. The first mold cylinder is a cylindrical structure including the first end, and the second mold cylinder is a cylindrical structure including the second end. The first mold cylinder, the second mold cylinder, and the curved plate are detachably connected to form the cylindrical structure. The sample preparation device and the sample preparation method of the present invention have a simple structure, are easy to operate, and have good integrity of the prepared samples.

Description

Technical Field

[0001] The present invention belongs to the field of sample preparation equipment, and more particularly, relates to a sample preparation equipment and a sample preparation method thereof. Background Art

[0002] Because soil particles can be arranged differently in different directions during natural deposition or artificial filling due to various reasons, the soil exhibits significant anisotropy. This anisotropy also results in different mechanical properties and parameters. To study the mechanical behavior of soil, indoor triaxial testing is one of the most commonly used methods. It can effectively measure the stress-strain relationship and strength of the soil, simulate different working conditions, effectively control drainage conditions, and conduct tests with different stress paths. Therefore, to study the anisotropic behavior of cohesionless soil, an important step is to prepare anisotropic specimens for triaxial testing of cohesionless soil.

[0003] Specimen preparation plays a crucial role in the success of subsequent testing. Conventional triaxial test specimen preparation methods can only produce specimens with a deposition plane aligned with the loading direction, i.e., a deposition angle of 0 degrees. This method cannot meet the requirements for studying the anisotropic behavior of cohesionless soils. Existing methods for preparing anisotropic triaxial specimens mostly involve first preparing a horizontally deposited specimen in a model box. Then, a thin-walled ring cutter is used to cut the specimen at an angle θ with the vertical, thereby producing a specimen with a deposition angle of θ. This method is not a problem for soils with smaller particle sizes. However, for cohesionless soils with larger particle sizes, such as gravel or sandy gravel, thin-walled ring cutter cutting is more difficult due to the large particle size, and the resulting rough edges and incomplete specimens are very likely to occur. For cohesionless soils with easily broken particles, such as calcareous sand, the ring cutter cutting is even more likely to cause particle breakage, seriously affecting test results. Therefore, it is necessary to develop new anisotropic specimen preparation equipment and methods to ensure the preparation of good anisotropic specimens for triaxial testing of cohesionless soils. Summary of the Invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a sample preparation device and a sample preparation method thereof, which aims to at least partially solve the technical problem that samples are easily damaged when preparing anisotropic soil samples.

[0005] To achieve the above objectives, according to one aspect of the present invention, a sample preparation device is provided. The sample preparation device is a cylindrical structure having a hollow inner cavity, the cylindrical structure including a first end and a second end disposed opposite to each other along the axis of the cylindrical structure; the sample preparation device includes a first mold cylinder, a second mold cylinder, and a curved plate;

[0006] The first mold cylinder is a cylindrical structure including the first end portion, and the second mold cylinder is a cylindrical structure including the second end portion; the first mold cylinder, the second mold cylinder and the curved plate are detachably connected to form the column structure.

[0007] Preferably, any one of the first mold tube and the second mold tube is spliced ​​with one of the curved plates to obtain a mold; the end face of the opening of the mold is a plane, and a preset angle is formed between the plane and the axis of the mold.

[0008] Preferably, any one of the first mold tube and the second mold tube includes a first end face and a second end face, the first end face and the second end face form an opening structure arranged opposite to the first end face or the second end face, and the extension line of the intersection of the first end face and the second end face passes through the center of the column structure.

[0009] Preferably, the first end surface and the second end surface are perpendicular to each other.

[0010] Preferably, any one of the first mold cylinder and the second mold cylinder includes a first mold block and a second mold block; the first mold block includes a fifth end face and a sixth end face, and the second mold block includes a seventh end face and an eighth end face; the fifth end face is fitted with the seventh end face, and the plane formed by the fitting of the fifth end face and the seventh end face passes through the center of the column structure; the sixth end face and the eighth end face are located in the same plane, forming the end face of the first end portion or the second end portion.

[0011] Preferably, the sample preparation device further comprises a base; the base is a prism structure, and the angle between at least one pair of adjacent side surfaces of the prism structure is the same as the preset angle.

[0012] Preferably, a plurality of protrusions are fixed on at least one side surface of the prism structure for inserting and fixing the first mold cylinder or the second mold cylinder.

[0013] To achieve the above object, according to another aspect of the present invention, a sample preparation method is provided, comprising the above sample preparation equipment and facilities, comprising:

[0014] Splicing and fixing the first mold cylinder to one of the curved plates, and splicing and fixing the second mold to another curved plate, to obtain a first mold and a second mold respectively;

[0015] Fixing the first end of the first mold and the second end of the second mold respectively so that the upper end surfaces of the first mold and the second mold are horizontal, and the axes of the first mold and the second mold form a preset angle with the vertical direction;

[0016] Loading raw materials of the sample to be prepared into the first mold and the second mold, and adding airless water into the first mold and the second mold;

[0017] After freezing the raw materials in the first mold and the second mold, the first mold and the second mold are spliced ​​and fixed to form the column structure, and the axis of the column structure forms the preset angle with the vertical direction;

[0018] After the raw materials in the column structure are fully interlocked, they are frozen into shape and taken out from the column structure to prepare a sample with a deposition angle of the preset angle.

[0019] In general, the above technical solution conceived by the present invention has the following advantages compared with the prior art:

[0020] 1. The sample preparation equipment is composed of a curved plate and a mold cylinder containing columnar structure ends, which are connected in a detachable manner. After sample preparation is completed, it is convenient to remove the sample and ensure the integrity of the sample. It is also convenient to prepare a variety of samples with specific deposition angles, and has greater applicability.

[0021] 2. The mold barrel and curved plate are joined to form a mold with a flat end surface at the opening, facilitating disassembly and enabling more accurate sample preparation with the appropriate deposition angle. For any mold barrel, the intersection of the two end surfaces forming the opening passes through the center of the column structure. These two end surfaces are perpendicular to each other, allowing for flexible and diverse joining of the curved plate and barrel, facilitating the preparation of triaxially oriented samples. Each mold barrel is constructed with removable connecting mold blocks, facilitating disassembly and maintaining sample integrity.

[0022] 3. The base adopts a prismatic structure, which makes it easy to fix the column structure according to the preset angle.

[0023] 4. The sample is prepared from a cylindrical structure formed by multiple mold cylinders and a curved plate structure. During the preparation process, no ring knife cutting is required. The preparation process is simple and easy to implement. The deposition angle of the obtained sample is consistent and the sample integrity is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of a sample preparation device according to an embodiment of the present invention;

[0025] Figure 2 is a side view of a sample preparation device according to an embodiment of the present invention;

[0026] Figure 3 is a side view of a sample preparation device according to an embodiment of the present invention;

[0027] Figure 4This is a schematic structural diagram of the connection between a first mold and a base of a sample preparation device according to an embodiment of the present invention;

[0028] Figure 5 2 is a schematic structural diagram of a second mold of a sample preparation device according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic structural diagram of the connection between a first mold and a base of a sample preparation device according to an embodiment of the present invention;

[0030] Figure 7 2 is a schematic structural diagram of a second mold of a sample preparation device according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic structural diagram of a first mold of a sample preparation device according to an embodiment of the present invention;

[0032] Figure 9 2 is a schematic structural diagram of a second mold of a sample preparation device according to an embodiment of the present invention;

[0033] Figure 10 This is a structural schematic diagram of a base of a sample preparation device according to an embodiment of the present invention;

[0034] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0035] 1-first mold, 11-first mold cylinder, 111-first mold block, 112-second mold block, 113-fifth end face, 114-sixth end face, 115-seventh end face, 116-eighth end face, 12-first curved plate, 13-first end face, 14-second end face, 15-third end face, 16-fourth end face, 17-ear plate, 2-second mold, 21-second mold cylinder, 211-third mold block, 212-fourth mold block, 22-second curved plate, 3-base, 31-protrusion. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0037] See also Figure 1As shown, an embodiment of the present invention provides a sample preparation device, which is a cylindrical structure with a hollow inner cavity, and the cylindrical structure includes a first end and a second end arranged opposite to each other along the axis direction of the cylindrical structure; the sample preparation device includes a first mold cylinder 11, a second mold cylinder 21 and a curved plate; the first mold cylinder 11 is a cylindrical structure including the first end, and the second mold cylinder 21 is a cylindrical structure including the second end; the first mold cylinder 11, the second mold cylinder 21 and the curved plate are detachably connected to form a cylindrical structure.

[0038] The sample preparation device of the embodiment of the present application is particularly suitable for preparing cohesionless soil samples with a specific deposition angle. The sample preparation device has a cylindrical structure with a hollow inner cavity. It can be a cylindrical structure or a multi-faceted cylindrical structure. The embodiment of the present application uses a cylindrical structure as an example for description. Along the axial direction of the cylindrical structure, the cylindrical structure has two opposite ends, namely a first end and a second end. Figure 1 As shown, the first end and the second end may correspond to the bottom and the top of the column structure, respectively.

[0039] The sample preparation device includes a first mold cylinder 11, a second mold cylinder 21 and a curved plate. There are usually two curved plates. In the embodiment of the present application, two curved plates are used as an example for description, namely a first curved plate 12 and a second curved plate 22.

[0040] The first mold tube 11 is a cylindrical structure comprising a first end portion of a cylindrical structure. One end of the first mold tube 11, including the first end portion, is closed, forming the first end portion of the cylindrical structure; the other end has a first opening for mating with the second mold tube 21 and / or the curved plate to enclose the hollow inner cavity of the cylindrical structure.

[0041] Similarly, the second mold barrel 21 is a cylindrical structure comprising a second end portion of a cylindrical structure. One end of the second mold barrel 21, including the second end portion, is closed, forming the second end portion of the cylindrical structure; the other end has a second opening configured to mate with the first mold barrel 11 and / or the curved plate to enclose the hollow interior cavity of the cylindrical structure. It will be appreciated that the first and second openings can be regularly shaped or irregularly shaped, such as with a serrated side profile.

[0042] The four modules, comprising the first mold cylinder 11, the second mold cylinder 21, and the two curved plates, form a cylindrical structure. Depending on the specific modules that are assembled, intermediate sample preparation structures of varying structures can be formed. Raw materials for sample preparation are then filled into the hollow interiors of the cylindrical structures or intermediate sample preparation structures, resulting in samples with varying properties. Once sample preparation is complete, the first mold cylinder 11, the second mold cylinder 21, and the curved plates can be disassembled for easy sample removal.

[0043] Regarding the detachable connection of the modules, lugs 17 with screw holes can be fixed to corresponding modules. For example, when the first mold cylinder 11 and the first curved plate 12 are fitted together, the lugs 17 on the first mold cylinder 11 and the lugs 17 on the first curved plate 12 are also fitted together, and the corresponding lugs 17 are then tightened using bolts or other fasteners. It is understood that the detachable connection of the modules is not specifically limited, as long as it facilitates the fixed connection and removal of the modules and does not affect the sample preparation effect.

[0044] When preparing a sample, first mold tube 11 is joined to one of the curved panels to form first mold 1, and second mold tube 21 is joined to the other curved panel to form second mold 2. The axes of first mold tube 11 and second mold tube 21 are then fixed at an angle α to the vertical, and the raw materials used for sample preparation are filled into each. After appropriate processing, first mold 1 and second mold 2 are joined and processed accordingly to produce a sample with a deposition angle of α.

[0045] The sample preparation device of the embodiment of the present application can have a variety of intermediate combination structures to prepare samples with different properties, which can meet more experimental needs; and it is convenient to remove samples, which can better ensure the integrity and quality of the samples.

[0046] In some embodiments, any one of the first mold tube 11 and the second mold tube 21 is spliced ​​with a curved plate to obtain a mold; the end face of the opening of the mold is a plane, and a preset angle is formed between the plane and the axis of the mold.

[0047] There are two curved plates. For example, when the first mold cylinder 11 and the first curved plate 12 are joined to form the first mold 1, the open end surface of the first mold 1 is a plane, and this plane forms a predetermined angle with the axis of the first mold 1. Similarly, when the second mold cylinder 21 and the second curved plate 22 are joined to form the second mold 2, the open end surface of the second mold 2 is also a plane, and this plane also forms a predetermined angle with the axis of the second mold 2.

[0048] It is understood that when the first mold 1 and the second mold 2 are joined to form a cylindrical structure, the axes of the first mold 1 and the second mold 2 coincide with the axis of the cylindrical structure. Alternatively, the first mold barrel 11 and the second curved plate 22 may be joined, while the second mold barrel 21 and the first curved plate 12 may be joined. During sample preparation, when the first mold 1 and the second mold 2 are prepared separately, the end surfaces of the openings of each mold are horizontal, which allows the prepared samples to have a specific deposition angle.

[0049] In some embodiments, see Figure 2 and Figure 3As shown, any one of the first mold tube 11 and the second mold tube 21 includes a first end face 13 and a second end face 14, and the first end face 13 and the second end face 14 enclose an opening structure arranged opposite to the first end or the second end, and the extension line of the intersection of the first end face 13 and the second end face 14 passes through the center of the columnar structure.

[0050] The first mold cylinder 11 and the second mold cylinder 21 generally have the same structure. Figure 1 As shown, taking the first mold barrel 11 as an example, the structure of the first mold barrel 11 and the second mold barrel 21 is explained. The first mold barrel 11 includes a first end face 13 and a second end face 14. The first end face 13 and the second end face 14 are end faces that are enclosed to obtain a first opening shape. Wherein, the extension line of the intersection of the first end face 13 and the second end face 14 passes through the center of the column structure, then along the cross-sectional direction of the column structure, the length of the curved plate is less than or equal to 1 / 2 of the circumference of the column structure, which is more convenient for disassembly and avoids affecting the integrity of the sample during the disassembly process. Wherein, a certain angle is set between the first end face 13 and the second end face 14, and the size of the angle can be set according to actual needs; the first end face 13 and the second end face 14 are preferably perpendicular to each other, so as to facilitate the formation of samples with deposition angles of θ and 90°-θ.

[0051] The following further describes the structure of the sample preparation device by taking the structure of the first end face 13 and the second end face 14 of the mold cylinder as an example, wherein the first curved plate 12 and the first mold cylinder 11 are perpendicular to each other. Each curved plate includes a third end face 15 and a fourth end face 16. As one specific implementation method, see Figure 2 As shown, when the first mold cylinder 11 and the first curved plate 12 are spliced ​​together to form the first mold 1, the first end surface 13 of the first mold cylinder 11 can be aligned with the third end surface 15 of the first curved plate 12. It can be understood that the third end surface 15 of the first curved plate 12 and the first end surface 13 of the first mold cylinder 11 have the same shape and size. When the two are aligned together, the side wall of the first mold cylinder 11 and the first curved plate 12 form a partial side wall of the columnar structure.

[0052] When the third end surface 15 of the first curved plate 12 is in contact with the first end surface 13 of the first mold cylinder 11, the fourth end surface 16 of the first curved plate 12 and the second end surface 14 of the first mold cylinder 11 lie in the same plane. This plane is referred to as First Plane I. First Plane I can be considered the cross section AA of the cylindrical structure. Furthermore, the fourth end surface 16 of the first curved plate 12 and the second end surface 14 of the first mold cylinder 11 enclose an annular structure, forming the opening of the first mold 1.

[0053] The first plane I is arranged at a first preset angle of 90°-θ with the axis of the column structure. Figure 4As shown, when preparing a sample, the first end of the first mold 1 can be fixed so that the opening of the first mold 1 faces upward and the axis of the first mold 1 forms an angle θ with the vertical direction. At this point, the first plane I is horizontal. Cohesionless soil is placed in the first mold 1 and treated accordingly.

[0054] See also Figure 5 Similarly, when the second mold cylinder 21 and the second curved plate 22 are joined to form the second mold 2, the first end surface 13 of the second mold cylinder 21 can be aligned with the third end surface 15 of the second curved plate 22. At this point, the fourth end surface 16 of the second curved plate 22 and the second end surface 14 of the second mold cylinder 21 lie in the same plane, which is referred to as first plane II. Furthermore, the fourth end surface 16 of the second curved plate 22 and the second end surface 14 of the second mold cylinder 21 enclose an annular structure, forming the opening of the second mold 2.

[0055] The first plane II forms a first predetermined angle of 90°-θ with the axis of the column structure. When preparing the sample, the second end of the second mold 2 can be fixed so that the opening of the second mold 2 faces upward and the axis of the second mold 2 forms an angle θ with the vertical direction. At this point, the first plane II is horizontal. Cohesionless soil is placed in the second mold 2 and treated accordingly.

[0056] The opening of the second mold 2 is fitted over the opening of the first mold 1, and the two are joined and fixed to form a complete cylindrical structure. At this point, the material within the hollow interior of the cylindrical structure forms a sample model. After being processed under predetermined conditions, a sample with a deposition angle of θ is prepared.

[0057] As another specific implementation, see Figure 3 As shown, when the first mold cylinder 11 and the first curved plate 12 are spliced ​​together to form the first mold 1, the second end surface 14 of the first mold cylinder 11 can be aligned with the fourth end surface 16 of the first curved plate 12. The fourth end surface 16 of the first curved plate 12 has the same shape and size as the second end surface 14 of the first mold cylinder 11. When the two are aligned together, the side wall of the first mold cylinder 11 and the first curved plate 12 form a partial side wall of the columnar structure.

[0058] When the fourth end surface 16 of the first curved plate 12 is in contact with the second end surface 14 of the first mold cylinder 11, the third end surface 15 of the first curved plate 12 and the first end surface 13 of the first mold cylinder 11 are located in the same plane, which is referred to as the second plane I. The second plane can be regarded as the BB section of the column structure.

[0059] Furthermore, the third end surface 15 of the first curved plate 12 and the first end surface 13 of the first mold cylinder 11 enclose an annular structure, forming the opening of the first mold 1. It is understood that the first mold cylinder 11 can be respectively attached to the third end surface 15 and the fourth end surface 16 of the first curved plate 12 to form corresponding molds, and can be spliced ​​with another mold to form a cylindrical structure, so that the two curved plates have the same size specifications.

[0060] When the first end face 13 and the second end face 14 are perpendicular to each other, the second preset angle formed between the second plane I and the axis of the column structure is θ. Figure 6 As shown, when preparing a sample, the first end of the first mold 1 can be fixed so that the opening of the first mold 1 faces upward and the axis of the first mold 1 forms an angle of 90°-θ with the vertical. At this point, the second plane I is horizontal. Cohesionless soil is placed in the first mold 1 and treated accordingly.

[0061] Likewise, see Figure 7 As shown, when the second mold cylinder 21 and the second curved plate 22 are joined to form the second mold 2, the second end surface 14 of the second mold cylinder 21 can be aligned with the fourth end surface 16 of the second curved plate 22. At this point, the third end surface 15 of the second curved plate 22 and the first end surface 13 of the second mold cylinder 21 lie in the same plane, which is referred to as second plane II. Furthermore, the third end surface 15 of the second curved plate 22 and the first end surface 13 of the second mold cylinder 21 enclose an annular structure, forming the opening of the second mold 2.

[0062] The second plane II forms a second predetermined angle θ with the axis of the column structure. When preparing the sample, the second end of the second mold 2 can be fixed so that the opening of the second mold 2 faces upward and the axis of the second mold 2 forms an angle of 90°-θ with the vertical. At this point, the second plane II is horizontal. Cohesionless soil is placed in the second mold 2 and treated accordingly.

[0063] The opening of the second mold 2 is fitted over the opening of the first mold 1, and the two are joined and fixed to form a complete cylindrical structure. At this point, the material within the hollow interior of the cylindrical structure forms a sample model. After being processed under predetermined conditions, a sample with a deposition angle of 90°-θ is produced.

[0064] The mold cylinder and curved plate of the above structure can be used to prepare samples with different deposition angles by adjusting the splicing position of the mold cylinder and the curved plate. The structure is simple. After the sample preparation is completed, the mold cylinder and the curved plate are disassembled to facilitate the removal of the sample, which is conducive to ensuring the integrity of the sample.

[0065] In some embodiments, see Figure 1 and Figure 2As shown, any one of the first mold cylinder 11 and the second mold cylinder 21 includes a first mold block 111 and a second mold block 112; the first mold block 111 includes a fifth end face 113 and a sixth end face 114, and the second mold block 112 includes a seventh end face 115 and an eighth end face 116; the fifth end face 113 is fitted with the seventh end face 115, and the plane formed by the fitting of the fifth end face 113 and the seventh end face 115 passes through the center of the column structure; the sixth end face 114 and the eighth end face 116 are located in the same plane, forming the end face of the first end or the second end.

[0066] The following description will continue using the structure of the first mold cylinder 11 as an example. The first mold cylinder 11 includes a first mold block 111 and a second mold block 112. The first mold block 111 includes a fifth end surface 113, a sixth end surface 114, and a first end surface 13; the second mold block 112 includes a seventh end surface 115, an eighth end surface 116, and a second end surface 14.

[0067] The fifth end face 113 of the first mold block 111 is aligned with the seventh end face 115 of the second mold block 112. Furthermore, the first mold block 111 and the second mold block 112 are detachably connected to form the first mold barrel 11. Because the extension of the intersection of the first end face 13 and the second end face 14 of the first mold barrel 11 passes through the center of the columnar structure, the plane where the fifth end face 113 and the seventh end face 115 align also passes through the center of the columnar structure. Typically, this plane coincides with the axis of the columnar structure and can be considered a CC cross-section of the columnar structure.

[0068] When the fifth end face 113 and the seventh end face 115 are fitted together, the sixth end face 114 and the eighth end face 116 are located in the same plane to form the end face of the first end portion. The first end face 13 and the second end face 14 enclose the shape of the first opening of the first mold tube 11 .

[0069] Similarly, the second mold barrel 21 also includes two mold blocks. To facilitate differentiation from the first mold barrel 11, the two mold blocks of the second mold barrel 21 are the third mold block 211 and the fourth mold block 212. Any mold barrel adopts a structure of two mold blocks spliced ​​together. After the sample preparation is completed, each mold block and each curved plate can be disassembled separately, which can make it easier to remove the sample. In addition, see Figure 8 As shown, using this structure, the first mold block 111, the fourth mold block 212, and the first curved plate 12 are spliced ​​together to obtain a half-cylinder structure cut along a section that includes the axis of the column structure. This half-cylinder structure serves as the first mold 1 and is fixed with the opening facing upward, so that the plane where the opening is located is horizontal.

[0070] Likewise, see Figure 9As shown, the second mold block 112, the third mold block 211, and the second curved plate 22 are spliced ​​together to form another semi-cylindrical structure, serving as the second mold 2. Using two molds of this structure for sample preparation can produce samples with a deposition angle of 90°. After sample preparation is complete, the mold blocks and curved plate are disassembled for easier sample removal.

[0071] In some embodiments, combined Figure 4 、 Figure 6 and Figure 10 As shown, the sample preparation device further includes a base 3; the base 3 is a prism structure, and the angle between at least one pair of adjacent side surfaces of the prism structure is the same as the first preset angle or the second preset angle.

[0072] The base 3 may be a triangular prism, a quadrangular prism, or another prism structure, as long as the angle between at least one pair of adjacent sides is the same as the first predetermined angle or the second predetermined angle. Generally speaking, the prism structure has one pair of adjacent sides with an angle that is the same as the first predetermined angle, and another pair of adjacent sides with an angle that is the same as the second predetermined angle.

[0073] Generally speaking, the prism structure preferably adopts a right-angled triangular prism structure, whose two acute angles are θ and 90°-θ, respectively. When the first end or the second end of the column structure used for sample preparation is fixed to the base 3, the column structure forms a predetermined angle with the vertical direction, thereby preparing samples with different deposition angles. A plurality of protrusions 31 can also be fixedly provided on the oblique side of the triangular prism to fix the column structure.

[0074] The embodiment of the present application further provides a sample preparation method, comprising: splicing and fixing a first mold cylinder 11 to a curved plate, and splicing and fixing a second mold cylinder 21 to another curved plate, to obtain a first mold 1 and a second mold 2, respectively;

[0075] Fix the first end of the first mold 1 and the second end of the second mold 2 respectively so that the upper end surfaces of the first mold 1 and the second mold 2 are horizontal, and the axes of the first mold 1 and the second mold 2 form a preset angle with the vertical direction;

[0076] The raw materials of the sample to be prepared are placed into the first mold 1 and the second mold 2, and airless water is added into the first mold 1 and the second mold 2;

[0077] After freezing the raw materials in the first mold 1 and the second mold 2, the first mold 1 and the second mold 2 are spliced ​​and fixed to form a column structure, and the axis of the column structure forms a preset angle with the vertical direction;

[0078] After the raw materials in the column structure are fully engaged, they are frozen into shape and taken out of the column structure to prepare a sample with a deposition angle that is a preset angle.

[0079] Take the preparation of a cohesionless soil sample as an example. After the first mold cylinder 11 and the first curved plate 12 are spliced ​​together, the first mold 1 is obtained. The base 3 can be fixed to the ground or other horizontal structure, and the first end of the first mold 1 is fixed to the oblique side of the triangular prism base 3. The angle between the oblique side of the triangular prism and the ground is θ. At this time, the angle between the axis of the first mold 1 and the vertical direction is also θ, and the opening of the first mold 1 is horizontal, that is, the upper end surface of the first mold 1 is horizontal.

[0080] Apply low-temperature grease evenly to the inner wall of the first mold 1. Then, apply plastic film over the grease. Pour non-cohesive soil vertically into the first mold 1 in layers to a specified height. Then, inject airless water into the first mold 1. Place the first mold 1 together with the base 3 in a low-temperature test chamber at -40°C until the sample is completely frozen, thereby obtaining the first intermediate sample.

[0081] Using the same processing as the first mold 1, add non-cohesive soil to the second mold 2 to prepare a second intermediate sample. Scrape the ice surface of the sample in the first mold 1, and turn the first mold 1 upside down on the second mold 2, so that the first mold 1 and the second mold 2 are spliced ​​together to obtain a columnar structure. Keep it in the stomach for about three hours, and the non-cohesive soil placed in the first mold 1 and the second mold 2 will thaw and contact each other until they are fully engaged. Then, put the columnar structure filled with non-cohesive soil into a low-temperature test chamber and store it at -40°C until the sample is completely frozen. After the columnar structure is taken out after the sample is completely frozen, disassemble the mold blocks and curved panels, and take out the sample, thus preparing a sample with a specific deposition angle of θ.

[0082] When a sample with a deposition angle of 90°-θ is to be prepared, the first mold cylinder 11 and the second curved plate 22 are spliced ​​together to form the first mold 1, and the second mold cylinder 21 and the first curved plate 12 are spliced ​​together to form the second mold 2. The angle between the end face of the opening of either mold 1 or the second mold 2 and the axis of the mold is θ. After the first mold 1 and the second mold 2 are spliced ​​together, a sample with a deposition angle of 90°-θ can be prepared according to the method for preparing a sample with a deposition angle of θ. Similarly, the first mold block 111, the fourth mold block 212, and the first curved plate 12 are spliced ​​together to form the first mold 1, and the second mold block 112, the third mold block 211, and the second curved plate 22 are spliced ​​together to form the second mold 2. Similarly, a sample with a deposition angle of 90° can be prepared in the above manner.

[0083] During the preparation process, no ring knife cutting is required, the preparation process is simple and easy to implement, the deposition angle of the obtained sample is consistent, and the sample integrity is good.

[0084] The sample preparation device and sample preparation method of the present invention are composed of a curved plate and a mold cylinder respectively including a columnar structure end, which are spliced ​​together in a detachable manner. After the sample preparation is completed, it is convenient to remove the sample; and it is also convenient to prepare a variety of samples with specific deposition angles, and the applicability is stronger.

[0085] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sample preparation method, characterized in that: The sample preparation method is based on a sample preparation device having a cylindrical structure with a hollow inner cavity, wherein the cylindrical structure comprises a first end and a second end disposed opposite to each other along the axis of the cylindrical structure; the sample preparation device comprises a first mold cylinder, a second mold cylinder, and a curved plate; The first mold cylinder is a cylindrical structure including the first end portion, and the second mold cylinder is a cylindrical structure including the second end portion; the first mold cylinder, the second mold cylinder and the curved plate are detachably connected to form the column structure; The sample preparation method comprises: Splicing and fixing the first mold cylinder to one of the curved plates, and splicing and fixing the second mold cylinder to another curved plate, to obtain a first mold and a second mold respectively; Fixing the first end of the first mold and the second end of the second mold respectively so that the upper end surfaces of the first mold and the second mold are horizontal, and the axes of the first mold and the second mold form a preset angle with the vertical direction; Loading raw materials of the sample to be prepared into the first mold and the second mold, and adding airless water into the first mold and the second mold; After freezing the raw materials in the first mold and the second mold, the first mold and the second mold are spliced ​​and fixed to form the column structure, and the axis of the column structure forms the preset angle with the vertical direction; After the raw materials in the column structure are fully interlocked, they are frozen into shape and taken out from the column structure to prepare a sample with a deposition angle of the preset angle.

2. The sample preparation method according to claim 1, wherein Any one of the first mold tube and the second mold tube is spliced ​​with a curved plate to obtain a mold; the end face of the opening of the mold is a plane, and a preset angle is formed between the plane and the axis of the mold.

3. The sample preparation method according to claim 1, wherein Either the first mold tube or the second mold tube includes a first end face and a second end face, the first end face and the second end face enclose an opening structure arranged opposite to the first end face or the second end face, and the extension line of the intersection of the first end face and the second end face passes through the center of the column structure.

4. The sample preparation method according to claim 3, wherein: The first end surface and the second end surface are perpendicular to each other.

5. The sample preparation method according to claim 1, wherein Either the first mold tube or the second mold tube includes a first mold block and a second mold block; the first mold block includes a fifth end face and a sixth end face, and the second mold block includes a seventh end face and an eighth end face; the fifth end face is fitted with the seventh end face, and the plane formed by the fitting of the fifth end face and the seventh end face passes through the center of the column structure; the sixth end face and the eighth end face are located in the same plane, forming the end face of the first end portion or the second end portion.

6. The sample preparation method according to claim 2, wherein: The sample preparation device further includes a base; the base is a prism structure, and the angle between at least a pair of adjacent side surfaces of the prism structure is the same as the preset angle.

7. The sample preparation method according to claim 6, wherein: At least one side surface of the prism structure is fixed with a plurality of protrusions for inserting and fixing the first mold cylinder or the second mold cylinder.

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