A soil sample preparation system and preparation method thereof having a soil sample pressing exhaust plate with a staggered ring rib structure

Abstract

The present invention discloses a soil sample preparation system and preparation method of a soil sample pressing and exhausting plate with a staggered ring rib structure, comprising a steel cylinder, in which a soil sample, a soil sample pressing and exhausting plate, filter paper and a pressure head are placed; the soil sample pressing and exhausting plate comprises a circular main board, and the front of the main board is provided with a plurality of ring ribs spaced in a radial direction with the center of the main board as the center of the circle; there is a ring seam between two adjacent ring ribs, and each ring rib is evenly provided with a plurality of inter-rib seams along its circumference, and the inter-rib seams on the two adjacent ring ribs are staggered in the circumference; exhaust holes penetrating the main board are formed on the ring seams and the inter-rib seams; the exhaust holes, inter-rib seams and ring seams constitute an exhaust channel; the gaps between the components and the exhaust channel of the soil sample pressing and exhausting plate together constitute an exhaust path for gas in the soil sample. The present invention provides an exhaust channel in soil sample pressing, which ensures the stable exhaust of gas during soil sample pressing and improves sample preparation efficiency and sample preparation quality.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical sample preparation and testing, and in particular to a soil sample preparation system and a preparation method thereof having a soil sample pressing and exhausting plate with a staggered ring rib structure. Background Art

[0002] The physical and mechanical parameters of natural soil and modified soil are key indicators guiding geotechnical engineering practice, such as soil unconfined compressive strength, water stability, dry-wet cycle strength, permeability, etc. In engineering survey and design, the engineering parameters of the above soils must be obtained through indoor tests on regular soil samples of fixed size in accordance with relevant provisions of national or industry standards.

[0003] Since the target dry density of soil samples in geotechnical tests is calculated by combining the maximum dry density obtained from indoor compaction tests and the compaction degree of soil in engineering design (both greater than 90%), the target dry density of soil samples pressed is relatively high, and it is more difficult to press soil samples with high compaction degree.

[0004] At the same time, geotechnical tests have high requirements for the uniformity of soil samples in the same batch of tests, such as the size of the soil samples, end surface flatness, dry density, etc. There are strict error requirements. Therefore, geotechnical sample preparation is the most basic and also the most important process link in geotechnical tests.

[0005] Soil is composed of three phases of matter: water, air, and soil particle skeleton, in which water and air exist in the gaps of the soil particle skeleton. Due to the high compressibility of air, it can bear large external compressive stress in a closed cavity and has the characteristic of volume expansion after unloading. Therefore, in geotechnical sampling, the discharge of air between the gaps of soil particles is the key to the smooth compression of loose soil and the close fit of the soil skeleton. The characteristics of the three-phase composition of soil put forward clear and specific requirements for the setting of soil exhaust channels in the sampling equipment and sampling process.

[0006] In the traditional soil sample pressing system, there is generally no exhaust plate at the end of the soil sample, and the axial load is directly transmitted by the pressure head to compress the soil. As a result, the air in the soil sample can only be discharged from the gaps between the soil sample and the inner wall of the steel cylinder, and between the pressure head and the inner wall of the steel cylinder. The gas exhaust channel is relatively single and highly random, and the exhaust channel cannot be guaranteed to be stable and smooth. There are problems such as insufficient gas exhaust and low soil sample pressing efficiency.

[0007] Even if an exhaust plate is set in the soil sample pressing system, the design of the ring rib structure in the existing geotechnical sample exhaust plate is relatively simple, without a staggered ring rib distribution structure, and only relies on improving the material strength and design thickness of the exhaust plate to ensure the overall rigidity, resulting in serious material waste. At the same time, the traditional geotechnical sample exhaust plate, due to the lack of staggered ring rib distribution structure, is prone to deformation under a large end pressure, and cannot ensure that the soil sample has a flat end surface after pressing. Summary of the invention

[0008] Based on the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a soil sample preparation system and a preparation method thereof having a soil sample pressing exhaust plate with a staggered ring rib structure. By arranging exhaust plates with staggered ring rib structures at both ends of the soil sample, while optimizing the structural design of the exhaust plate, an exhaust channel is provided during soil sample pressing, thereby ensuring stable discharge of gas during the soil sample pressing process and improving sample preparation efficiency and quality.

[0009] To achieve the above purpose, the present invention adopts the following technical measures:

[0010] The present invention provides a soil sample preparation system with a soil sample pressing and exhausting plate with a staggered ring rib structure, comprising a steel cylinder, wherein a soil sample, a soil sample pressing and exhausting plate, filter paper and a pressure head are placed in the steel cylinder; the filter paper, the soil sample pressing and exhausting plate and the pressure head are respectively and sequentially arranged at two ends of the soil sample in a direction away from the soil sample; the soil sample pressing and exhausting plate comprises a circular main board, the front side of the main board is provided with a plurality of ring ribs spaced in a radial direction with the center of the main board as the center of the circle; an annular seam is formed between two adjacent ring ribs, and a plurality of inter-rib seams are evenly arranged along the circumference of each ring rib, and the inter-rib seams on two adjacent ring ribs are staggered in the circumferential direction; exhaust holes penetrating the main board are formed on the annular seam and the inter-rib seam; the exhaust holes, the inter-rib seams and the annular seam constitute an exhaust channel; the gaps between the components together with the exhaust channel of the soil sample pressing and exhausting plate constitute an exhaust path for the gas in the soil sample.

[0011] Preferably, the back side of the mainboard is a flat surface.

[0012] Furthermore, the angle of the intercostal seams on each ring rib in the circumferential direction is 45°; and the exhaust holes in the intercostal seams are centrally arranged in the intercostal seams.

[0013] Preferably, the width of each annular slit is the same, and the exhaust holes in each annular slit are evenly spaced in the circumferential direction.

[0014] Preferably, an exhaust hole is also provided at the center of the main board.

[0015] Furthermore, the back side of the soil sample pressing and exhausting plate is in contact with the filter paper, and the front side of the soil sample pressing and exhausting plate is in contact with the pressure head.

[0016] As the core component of the soil sample preparation system with a soil sample pressing exhaust plate having a staggered ring rib structure, the exhaust plate has an exhaust channel consisting of exhaust holes, inter-rib gaps and annular gaps. Combined with the gap between the pressure head, the exhaust plate and the steel cylinder, it forms the air circulation path during the soil sample pressing process.

[0017] The exhaust plate with staggered ring rib structure plays an important role in structural support and air guiding in the soil sample preparation system having the soil sample pressing exhaust plate with staggered ring rib structure. The present invention can ensure that the air between the gaps of soil particles is discharged stably and smoothly during the soil sample pressing process, thereby reducing the compressibility of the soil sample, ensuring the uniformity of the sample preparation, and improving the soil sample pressing efficiency.

[0018] In actual operation, compared with the traditional soil sample pressing equipment without exhaust plates, the compaction degree of soil samples of the present invention can reach 96%, the uniformity of sample preparation is greatly improved, and the sample preparation efficiency is about 10 times that of the soil sample pressing equipment without exhaust plates.

[0019] The present invention also provides a method for preparing a soil sample using the soil sample preparation system having the soil sample pressing and exhausting plate with the staggered ring rib structure, comprising the following steps:

[0020] S1. Place soil sample and press exhaust plate

[0021] A pressure head is set at the bottom of the steel cylinder, and the back of the soil sample pressing and exhausting plate is tilted upward at a certain angle, and falls into the bottom along the inner wall of the steel cylinder. Then, a wooden pole is used to assist in placing the soil sample pressing and exhausting plate flat, with the back of the soil sample pressing and exhausting plate facing upward and the front facing downward to fit the pressure head;

[0022] S2. Place filter paper

[0023] Tilt the filter paper at a certain angle, and with the help of a wooden pole, let the filter paper fall to the bottom along the inner wall of the steel cylinder, and then use the wooden pole to make the filter paper flat, so that the filter paper fits the back of the soil sample pressing exhaust plate;

[0024] S3, layered loading

[0025] The soil sample is loaded into the steel cylinder by layered loading and vibrating, so that the lower end of the soil sample fits tightly with the filter paper at the bottom of the steel cylinder, and the upper end of the soil sample is kept flat;

[0026] S4. Place filter paper

[0027] Tilt the filter paper at a certain angle, and with the help of a wooden pole, let the filter paper fall along the inner wall of the steel cylinder onto the upper end surface of the soil sample. Then, with the help of a wooden pole, place the filter paper flat, so that the filter paper covers the upper end surface of the soil sample and fits with the upper end surface of the soil sample.

[0028] S5. Place soil sample to suppress exhaust plate

[0029] Place the soil sample pressing and exhausting plate with the front side facing upwards, tilt it at a certain angle, and drop it into the bottom along the inner wall of the steel cylinder. Then use a wooden pole to help the soil sample pressing and exhausting plate to be placed flat. The front side of the soil sample pressing and exhausting plate faces upwards, and the back side faces downwards to fit the filter paper.

[0030] S6. Press soil sample

[0031] The diameters of the soil sample pressing exhaust plate, filter paper and pressure head are slightly smaller than the inner diameter of the steel cylinder. The gaps between the components and the exhaust channel of the soil sample pressing exhaust plate together constitute the exhaust path of the gas in the soil sample.

[0032] The upper and lower parts of the steel cylinder are both provided with pressure heads. When the sample is pressed, the axial pressure is transmitted to the soil sample pressing exhaust plate and the soil sample through the pressure heads. Under the action of the compression load, the pressure heads located at the upper and lower parts respectively fit with the upper and lower soil sample pressing exhaust plates, and the compression stress inside the soil sample increases. The gas in the soil sample flows through the filter paper and escapes through the exhaust holes, intercostal seams and annular seams of the soil sample pressing exhaust plate.

[0033] As the gas is discharged, the compressibility of the soil sample increases, the intergranular porosity decreases, and the dry density of the soil sample increases. When the sample preparation reaches the termination pressure or the termination dry density limit, the system stops the pressure output and the sample preparation ends.

[0034] S7, demoulding and disassembly

[0035] Remove the pressure head on the top of the steel cylinder, use a demoulding machine or use the pressure head at the bottom of the steel cylinder to move upward to push out the soil sample and the soil sample pressing and exhaust plates at the upper and lower ends. After taking out the cylindrical soil sample, disassemble and separate the cylindrical soil sample, the soil sample pressing and exhaust plates at the upper and lower ends, and the filter paper to complete the soil sample preparation. Clean the soil sample preparation system and its accessories of the soil sample pressing and exhaust plates with staggered ring rib structure, and collect them.

[0036] In the above soil sample preparation steps, the correct placement of the exhaust plates at the upper and lower ends of the soil sample is a key step. When placing the exhaust plates at the upper and lower ends of the soil sample, ensure that the back of the exhaust plate is flat and in contact with the filter paper and the soil sample. The exhaust plate at the lower end of the soil sample is placed horizontally with the back facing up, and the filter paper is placed between the exhaust plate and the soil sample. The exhaust plate at the upper end of the soil sample is placed horizontally with the back facing down, and the filter paper is placed between the exhaust plate and the soil sample.

[0037] The correct placement of the exhaust plate can ensure the independence and smoothness of the exhaust channel, which is convenient for the smooth exhaust of air in the soil particles. At the same time, after the soil sample is pressed, the end surface of the soil sample is flat and has high uniformity.

[0038] Compared with the prior art, the soil sample preparation system and preparation method of the soil sample pressing and exhausting plate with a staggered ring rib structure of the present invention have the following beneficial effects and advantages:

[0039] ①The main board and staggered ring rib structure ensure the overall rigidity and stability of the exhaust plate;

[0040] ② The exhaust holes, intercostal seams and annular seams form a stable exhaust channel;

[0041] ③The main structure of the exhaust plate and the exhaust channel are independent of each other;

[0042] ④ The back of the exhaust plate is flat to ensure that the end of the soil sample is flat after being pressed and formed;

[0043] ⑤ Use the exhaust plate in combination with filter paper to prevent soil particles from blocking the exhaust holes;

[0044] ⑥The exhaust plate is simple in design and easy to replicate industrially.

[0045] The present invention provides an exhaust channel in the soil sample pressing process while optimizing the exhaust plate structural design by arranging exhaust plates with staggered ring rib structures at both ends of the soil sample, thereby ensuring the stable discharge of gas during the soil sample pressing process and improving the sample preparation efficiency and quality. In short, the exhaust plate of the present invention can be used in conjunction with a soil sample preparation system having a soil sample pressing exhaust plate with a staggered ring rib structure, and a pressure head is used to apply a compressive load to the soil sample in the steel cylinder to press the soil sample. The present invention has a stable overall structure, high rigidity, and an independent and stable exhaust channel, which can ensure that the gas in the soil sample is discharged quickly and stably to complete the soil sample preparation. The present invention combines a steel cylinder, filter paper and a pressure head to realize the preparation of cylindrical soil samples with different compaction degrees and moisture contents. The present invention has a unified standard and can realize multiple industrial replications, and is suitable for the pressing of cylindrical specimens of various natural soil samples and modified soil samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is a front view of a soil sample preparation system having a soil sample pressing and exhausting plate with a staggered ring rib structure according to the present invention;

[0048] Figure 2 It is a back view of the soil sample preparation system of the present invention having a soil sample pressing and exhausting plate with a staggered ring rib structure;

[0049] Figure 3 It is a front schematic diagram of a soil sample preparation system having a soil sample pressing and exhausting plate with a staggered ring rib structure according to the present invention;

[0050] Figure 4 yes Figure 3 Schematic diagram of section Ⅰ-Ⅰ in FIG.

[0051] Figure 5 yes Figure 3 Schematic diagram of section II-II in FIG.

[0052] Figure 6 It is a structural schematic diagram of a soil sample preparation system of the present invention having a soil sample pressing and exhaust plate with a staggered ring rib structure.

[0053] In the figure: 1—main board; 2—ring rib; 3—exhaust hole; 4—interrib gap; 5—ring gap; A—exhaust plate; B—steel cylinder; C—filter paper; D—soil sample; E—pressure head. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] See below Figure 1 to Figure 6 The soil sample preparation system and preparation method of the soil sample pressing and exhaust plate with a staggered ring rib structure of the present invention are described in detail.

[0056] The soil sample preparation system of the present invention having a soil sample pressing and exhausting plate with a staggered ring rib structure comprises a steel cylinder B and a soil sample D placed in the steel cylinder B, a filter paper C and a pressure head E. The two ends of the soil sample D are respectively provided with filter paper C, a soil sample pressing and exhausting plate and a pressure head E in a direction away from the soil sample. The gaps between the components together with the exhaust channel of the soil sample pressing and exhausting plate constitute a discharge path for the gas in the soil sample.

[0057] The diameter of the soil sample pressing exhaust plate (hereinafter referred to as exhaust plate A) is adapted to the inner diameter of the steel cylinder B in the soil sample preparation system of the soil sample pressing exhaust plate with a staggered ring rib structure; when the soil sample is pressed, the exhaust plate A is placed at the upper and lower ends of the soil sample D, and the filter paper C is placed between the exhaust plate A and the soil sample D, and the back of the exhaust plate A is in contact with the filter paper C;

[0058] In the steel cylinder B of the soil sample preparation system having a soil sample pressing exhaust plate with a staggered ring rib structure, from bottom to top, there are the pressure head E, the exhaust plate A, the filter paper C, the soil sample D, the filter paper C, the exhaust plate A, and the pressure head E.

[0059] The diameters of the exhaust plate A, filter paper C and pressure head E are slightly smaller than the inner diameter of the steel cylinder B. The gaps between the components and the exhaust channel of the exhaust plate A together constitute the exhaust path of the gas in the soil sample D.

[0060] The exhaust plate A of the present invention comprises a circular main plate 1, and a plurality of ring ribs 2 are arranged at intervals in the radial direction with the center of the main plate 1 as the center of the circle on the front side of the main plate 1, and a ring seam 5 is formed between two adjacent ring ribs 2, and a plurality of inter-rib seams 4 are evenly arranged along the circumference of each ring rib, and the inter-rib seams 4 on two adjacent ring ribs 2 are staggered in the circumferential direction. Exhaust holes 3 penetrating the main plate 1 are formed on the annular seams 5 and the inter-rib seams 4, and the exhaust holes 3, the inter-rib seams 4 and the annular seams 5 constitute an exhaust channel.

[0061] 1. Overall

[0062] like Figure 1 , 2 As shown in Figures 3 and 4, the soil sample pressing exhaust plate of the present invention comprises a main plate 1, annular ribs 2, exhaust holes 3, inter-rib seams 4 and annular seams 5. The main plate 1 is circular, the main plate 1 and the annular ribs 2 constitute the main body of the exhaust plate A, and the exhaust holes 3, inter-rib seams 4 and annular seams 5 constitute an exhaust channel.

[0063] Its location and connectivity are:

[0064] The front side of the exhaust plate A has multiple circles of staggered annular ribs 2, inter-rib seams 4 are provided between the annular ribs with the same radius (hereinafter referred to as same-diameter annular ribs) that form a circle, annular seams 5 are provided between adjacent non-same-diameter annular ribs, and exhaust holes 3 perpendicular to and penetrating the main board 1 are provided in the inter-rib seams 4 and the annular seams 5. The back side of the exhaust plate A is flat.

[0065] Working mechanism of the exhaust plate of the present invention:

[0066] The exhaust plate of the present invention is made of steel metal and has great structural rigidity. It is convenient to use in conjunction with a soil sample preparation system having a soil sample pressing exhaust plate with a staggered ring rib structure and is detachable.

[0067] The front of the exhaust plate has a staggered ring rib structure. The main plate 1 and the ring rib 2 constitute the main body of the exhaust plate, and the exhaust hole 3, the inter-rib seam 4 and the ring seam 5 constitute the exhaust channel. The main structure of the exhaust plate is independent of the exhaust channel.

[0068] When the soil sample is pressed, the exhaust plate A is placed at the upper and lower ends of the soil sample D, and the filter paper C is placed between the exhaust plate A and the soil sample D, and the back of the exhaust plate A is in contact with the filter paper C. From bottom to top, they are the pressure head E, the exhaust plate A, the filter paper C, the soil sample D, the filter paper C, the exhaust plate A, and the pressure head E. The combination of the exhaust plate A and the filter paper C can prevent soil particles from blocking the exhaust holes.

[0069] During the soil sample pressing process, the pressure head E applies a compressive load to the soil sample D in the steel cylinder B. Since the diameters of the exhaust plate A, filter paper C and pressure head E are slightly smaller than the inner diameter of the steel cylinder B, the gaps between the components and the exhaust channel of the exhaust plate together constitute the exhaust path of the gas in the soil sample, ensuring the stable exhaust of the gas during the soil sample pressing process. The loose soil sample is pressed smoothly, and the soil skeleton fits closely until the pressed soil sample reaches the target dry density value.

[0070] 2. Functional components

[0071] 1) Motherboard 1

[0072] like Figure 1 , 2As shown, the main board 1 is a steel circular plate, which is tightly connected to the ring rib 2 to form the main structure of the exhaust plate A. The thickness of the main board 1 is determined by the terminal pressure of the pressed sample to meet the structural stiffness requirements. The diameter of the main board 1 is adapted to the inner diameter of the steel cylinder B and is slightly smaller than the inner diameter of the steel cylinder B.

[0073] 2) Ring rib 2

[0074] like Figure 1 , 3 As shown in Figures 4 and 5, the annular rib 2 is a steel strip ring, which is tightly connected to the main board 1 or is integrally formed with the main board 1 to constitute the main structure of the exhaust plate A. During manufacturing and processing, the main structure can be made of a steel cylinder through integrated processing. Intercostal seams 4 are provided between the annular ribs of the same diameter, and annular seams 5 are provided between adjacent annular ribs of non-same diameter. The intercostal seams 4 equally separate the annular ribs of the same diameter. The annular ribs of the same diameter and the intercostal seams 4 are both axially symmetrical and centrally symmetrical. The axes of symmetry of adjacent annular ribs of non-same diameter form an angle of 45°. Adjacent annular ribs of non-same diameter are staggered with each other. The height and width of the annular rib 2 are uniform, and the height and width are determined by the sample preparation requirements.

[0075] 3) Exhaust hole 3

[0076] like Figure 1 , 2 As shown in Figures 3, 4 and 5, the exhaust holes 3 are arranged throughout the main board 1 and are distributed in the intercostal seams 4 and the annular seams 5. The exhaust holes 3 are arranged in the center of the intercostal seams 4 and are equally divided along the circumferential direction in the annular seams 5. The center of the main board 1 is also provided with exhaust holes 3. The diameters of the exhaust holes 3 in the main board 1 are uniform, and the diameters of the exhaust holes 3 are determined by the sample preparation requirements and are adapted to the widths of the intercostal seams 4 and the annular seams 5.

[0077] 4) Intercostal seam 4

[0078] like Figure 1 As shown, the intercostal seam 4 is located between the annular ribs of the same diameter, dividing the annular ribs of the same diameter into equal parts. The intercostal seams 4 of the same diameter are axially symmetrical and centrally symmetrical. The axes of symmetry of adjacent non-concentric intercostal seams 4 form an angle of 45°. The radial width of the intercostal seam 4 is the same as that of the annular ribs of the same diameter. The circumferential length of the intercostal seam 4 is determined by the sample preparation requirements. An exhaust hole 3 is centrally arranged in a single intercostal seam 4.

[0079] 5) Circumferential seam 5

[0080] like Figure 1 As shown, the annular seam 5 is located between adjacent non-uniform annular ribs, the widths of the non-uniform annular seams 5 are the same, exhaust holes 3 are equally divided in the circumferential direction of the annular seam 5, and the center of the main board 1 is a special circular annular seam 5, where an exhaust hole 3 is centrally arranged.

[0081] A) Exhaust plate A

[0082] The exhaust plate A is a steel component, which consists of a main board 1, annular ribs 2, exhaust holes 3, intercostal seams 4 and annular seams 5. The main structure of the exhaust plate A is the main board 1 and the annular ribs 2, and the exhaust channel consists of the exhaust holes 3, intercostal seams 4 and annular seams 5. The exhaust plate A has high strength and great structural rigidity.

[0083] B) Steel Cylinder B

[0084] Steel cylinder B is a steel component of the soil sample preparation system with a soil sample pressing exhaust plate having a staggered ring rib structure. It has high structural rigidity. The inner diameter of steel cylinder B is slightly larger than the diameters of the exhaust plate A, filter paper C and pressure head E. During sample preparation, steel cylinder B is filled with soil sample D to provide lateral constraints on soil sample D.

[0085] C) Filter Paper C

[0086] The filter paper C is a standard commercial product. The diameter of the filter paper C is compatible with the exhaust plate A and is slightly smaller than the inner diameter of the steel cylinder B.

[0087] D) Soil sample D

[0088] Soil sample D is natural soil or modified soil. Soil sample D is composed of three-phase substances: soil particles, liquid, and gas. When preparing the sample, the soil sample D is filled in the steel cylinder B in a layered filling manner. From bottom to top, they are the pressure head E, exhaust plate A, filter paper C, soil sample D, filter paper C, exhaust plate A, and pressure head E. The soil sample D after pressing is a cylindrical soil sample with flat ends.

[0089] E) Pressure head E

[0090] The pressure head E is a transmission component of the axial compression load in the soil sample preparation system with a soil sample pressing exhaust plate having a staggered ring rib structure. The pressure heads E located at the upper and lower parts have the functions of disassembly and assembly and up and down stroke. The pressure head E is in the steel cylinder B and contacts the exhaust plates A at the upper and lower ends of the soil sample D respectively. The diameter of the pressure head E is slightly smaller than the inner diameter of the steel cylinder B.

[0091] When demoulding, the pressure head E on the upper part of the steel cylinder B can be disassembled or removed, and the pressure head E on the lower part moves upward, and the soil sample D and the exhaust plates A at the upper and lower ends thereof will be removed from the steel cylinder B together.

[0092] Below, refer to Figures 1 to 6 Combined with the description of the above structural features, the soil sample preparation method of the soil sample preparation system of the soil sample pressing and exhausting plate with a staggered ring rib structure of the present invention is briefly introduced:

[0093] This preparation method comprises the following steps:

[0094] ① Place the exhaust plate

[0095] In the soil sample preparation system with a soil sample pressing exhaust plate having a staggered ring rib structure, a pressure head E is provided at the bottom of the steel cylinder B, and the exhaust plate A is placed with its back facing upward and tilted at a certain angle, and falls into the bottom along the inner wall of the steel cylinder B, and then a wooden pole is used to assist in placing the exhaust plate A flat, with its back facing upward and its front facing downward in contact with the pressure head E;

[0096] ② Place filter paper

[0097] In the soil sample preparation system with a soil sample pressing exhaust plate with a staggered ring rib structure, the filter paper C is tilted at a certain angle, and with the help of a wooden rod, the filter paper C falls to the bottom along the inner wall of the steel cylinder B, and then the filter paper C is placed flat with the help of a wooden rod, and the filter paper C is fitted with the back of the exhaust plate A;

[0098] ③Layered Sampling

[0099] In the soil sample preparation system with a soil sample pressing and exhausting plate having a staggered ring rib structure, the soil sample D is loaded into the steel cylinder B by layered loading and vibrating, so that the lower end surface of the soil sample D is closely fitted with the filter paper C at the bottom of the steel cylinder B, and the upper end surface of the soil sample D is kept flat;

[0100] ④ Place filter paper

[0101] In the soil sample preparation system with the soil sample pressing exhaust plate having the staggered ring rib structure, the filter paper C is tilted at a certain angle, and with the assistance of a wooden rod, the filter paper C is made to fall into the upper end surface of the soil sample D along the inner wall of the steel cylinder B, and then the filter paper C is placed flat with the assistance of the wooden rod, and the filter paper C covers the upper end surface of the soil sample D and fits with the upper end surface of the soil sample D;

[0102] ⑤ Place the exhaust plate

[0103] In the soil sample preparation system with a soil sample pressing exhaust plate having a staggered ring rib structure, the front side of the exhaust plate A is upward, tilted at a certain angle, and dropped to the bottom along the inner wall of the steel cylinder B, and then a wooden pole is used to assist in placing the exhaust plate A flat, with the front side of the exhaust plate A facing upward and the back side facing downward to fit the filter paper C;

[0104] ⑥ Press soil sample

[0105] The diameters of the exhaust plate A, filter paper C and pressure head E are slightly smaller than the inner diameter of the steel cylinder B. The gaps between the components and the exhaust channel of the exhaust plate A together constitute the exhaust path of the gas in the soil sample D.

[0106] The upper and lower parts of the steel cylinder B are both provided with pressure heads E. When the sample is pressed, the axial pressure is transmitted to the exhaust plate A and the soil sample D through the pressure head E. Under the action of the compression load, the pressure heads E located at the upper and lower parts respectively fit with the upper and lower exhaust plates A, and the compression stress inside the soil sample D increases. The gas in the soil sample D flows through the filter paper C and escapes through the exhaust hole 3, the intercostal seam 4 and the annular seam 5 of the exhaust plate A.

[0107] As the gas is discharged, the compressibility of soil sample D increases, the intergranular porosity decreases, and the dry density of soil sample D increases. When the sample preparation reaches the termination pressure or the termination dry density limit, the system stops the pressure output and the sample preparation ends.

[0108] ⑦ Demolding and disassembly

[0109] Remove the pressure head E on the top of the steel cylinder B, use a demoulding machine or use the pressure head E at the bottom of the steel cylinder B to move upward to push out the soil sample D and the exhaust plates A at the upper and lower ends. After taking out the cylindrical soil sample D, disassemble and separate the cylindrical soil sample D, the exhaust plates A at the upper and lower ends, and the filter paper C to complete the preparation of the soil sample D. Clean the soil sample preparation system and its accessories of the soil sample pressing exhaust plate with a staggered ring rib structure, and collect them.

[0110] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be understood by anyone familiar with the technology within the technical scope disclosed by the present invention should be included in the scope of the present invention.

Claims

1. A soil sample preparation system having a soil sample pressing and exhausting plate with a staggered ring rib structure, comprising a steel cylinder, characterized in that: A soil sample, a soil sample compression and exhaust plate, filter paper and a pressure head are placed in the steel cylinder; the filter paper, the soil sample compression and exhaust plate and the pressure head are arranged in sequence at both ends of the soil sample in a direction away from the soil sample; The soil sample pressing and exhausting plate comprises a circular main plate, and a front side of the main plate is provided with a plurality of ring ribs spaced apart in a radial direction with the center of the main plate as the center of the circle; There is an annular gap between two adjacent ring ribs, and each ring rib is evenly provided with a plurality of inter-rib gaps along its circumference, and the inter-rib gaps on two adjacent ring ribs are staggered in the circumferential direction; The annular seam and the intercostal seam are formed with exhaust holes penetrating the main board; the exhaust holes, the intercostal seams and the annular seam constitute an exhaust channel; The gaps between the components and the exhaust channel of the soil sample pressing exhaust plate together constitute an exhaust path for the gas in the soil sample.

2. The soil sample preparation system having a soil sample pressing and exhaust plate with a staggered ring rib structure according to claim 1, characterized in that: The back side of the main board is a flat surface.

3. The soil sample preparation system having a soil sample pressing and exhausting plate with a staggered ring rib structure according to claim 1, characterized in that: The included angle of the intercostal seams on each ring rib in the circumferential direction is 45°; the exhaust hole in the intercostal seams is centrally arranged in the intercostal seams.

4. The soil sample preparation system having a soil sample pressing and exhaust plate with a staggered ring rib structure according to claim 1, characterized in that: The width of each annular gap is the same, and the exhaust holes in each annular gap are evenly spaced in the circumferential direction.

5. The soil sample preparation system having a soil sample pressing and exhausting plate with a staggered ring rib structure according to claim 1, characterized in that: An exhaust hole is also arranged at the center of the main board.

6. The soil sample preparation system having a soil sample pressing and exhaust plate with a staggered ring rib structure according to claim 1, characterized in that: The back side of the soil sample pressing and exhausting plate is in contact with the filter paper, and the front side of the soil sample pressing and exhausting plate is in contact with the pressure head.

7. A method for preparing soil samples using a soil sample preparation system having a soil sample pressing and exhausting plate with a staggered ring rib structure as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Place soil sample and press exhaust plate A pressure head is set at the bottom of the steel cylinder, and the back of the soil sample pressing and exhausting plate is tilted upward at a certain angle, and falls into the bottom along the inner wall of the steel cylinder. Then, a wooden pole is used to assist in placing the soil sample pressing and exhausting plate flat, with the back of the soil sample pressing and exhausting plate facing upward and the front facing downward to fit the pressure head; S2. Place filter paper Tilt the filter paper at a certain angle, and with the help of a wooden pole, let the filter paper fall to the bottom along the inner wall of the steel cylinder, and then use the wooden pole to make the filter paper flat, so that the filter paper fits the back of the soil sample pressing exhaust plate; S3, layered loading The soil sample is loaded into the steel cylinder by layered loading and vibrating, so that the lower end of the soil sample fits tightly with the filter paper at the bottom of the steel cylinder, and the upper end of the soil sample is kept flat; S4. Place filter paper Tilt the filter paper at a certain angle, and with the help of a wooden pole, let the filter paper fall along the inner wall of the steel cylinder onto the upper end surface of the soil sample. Then, with the help of a wooden pole, place the filter paper flat, so that the filter paper covers the upper end surface of the soil sample and fits with the upper end surface of the soil sample. S5. Place soil sample to suppress exhaust plate Place the soil sample pressing and exhausting plate with the front side facing upwards, tilt it at a certain angle, and drop it into the bottom along the inner wall of the steel cylinder. Then use a wooden pole to help the soil sample pressing and exhausting plate to be placed flat. The front side of the soil sample pressing and exhausting plate faces upwards, and the back side faces downwards to fit the filter paper. S6. Press soil sample The diameters of the soil sample pressing exhaust plate, filter paper and pressure head are slightly smaller than the inner diameter of the steel cylinder. The gaps between the components and the exhaust channel of the soil sample pressing exhaust plate together constitute the exhaust path of the gas in the soil sample. The upper and lower parts of the steel cylinder are both provided with pressure heads. When the sample is pressed, the axial pressure is transmitted to the soil sample pressing exhaust plate and the soil sample through the pressure heads. Under the action of the compression load, the pressure heads located at the upper and lower parts respectively fit with the upper and lower soil sample pressing exhaust plates, and the compression stress inside the soil sample increases. The gas in the soil sample flows through the filter paper and escapes through the exhaust holes, intercostal seams and annular seams of the soil sample pressing exhaust plate. As the gas is discharged, the compressibility of the soil sample increases, the intergranular porosity decreases, and the dry density of the soil sample increases. When the sample preparation reaches the termination pressure or the termination dry density limit, the system stops the pressure output and the sample preparation ends. S7, demoulding and disassembly Remove the pressure head on the top of the steel cylinder, use a demoulding machine or use the pressure head at the bottom of the steel cylinder to move upward to push out the soil sample and the soil sample pressing and exhaust plates at the upper and lower ends. After taking out the cylindrical soil sample, disassemble and separate the cylindrical soil sample, the soil sample pressing and exhaust plates at the upper and lower ends, and the filter paper to complete the soil sample preparation. Clean the soil sample preparation system and its accessories of the soil sample pressing and exhaust plates with staggered ring rib structure, and collect them.

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