Undisturbed soil sampling device suitable for indoor direct shear test

Abstract

The utility model belongs to the technical field of sandy soil sampling, and particularly relates to an undisturbed soil sampling device suitable for an indoor direct shear test, which comprises a plain-end cutting ring, a cutting ring with a blade, a sleeve, a rectangular cutting plate, a cutting plate with a blade, a circular cover plate and a flat-angle cover plate. Then the cutting ring and the sleeve are pushed into soil, the upper surface and the lower surface of the cutting ring are scraped to be flat through a cutting plate, the cutting plate is fixed up and down through bolts, sealed storage is conducted, after the cutting ring is sent to a test room, the bolts are removed, cutting ring samples with cover plates are placed into a shear box, meanwhile, adhesive tape between the cutting ring samples is cut open through a small knife, and a test is prepared; according to the device, disturbance to surrounding sandy soil is reduced, the integrity and accuracy of the sampling process are ensured through the cutting and collecting functions of the sampling device, and reliable basic data support is provided for sandy soil research.

Description

TECHNICAL FIELD

[0001] The utility model relates to sand sampling technical field especially suitable for undisturbed soil sampling device of indoor direct shear test. BACKGROUND

[0002] At present, the undisturbed sand sampling device is a kind of equipment that can collect and keep the sand sample with natural water content, structure and nature for subsequent test and analysis. The undisturbed sand sampling device in the prior art has many deficiencies in practical application. First, even if the undisturbed soil sample is taken, it is cut into the same size sample as the cutting ring in the laboratory, then the sample is pressed into the shear through the water-permeable stone. This process undoubtedly increases the disturbance of the soil body, which affects the accuracy of the test results to some extent. At the same time, after sampling by the traditional method, the sample is placed into the collection box. This process causes large disturbance of the sand during sampling, which affects the undisturbed nature of the sample. The patent application "Portable undisturbed soil sampling device (CN201821195486.9)" provides a portable undisturbed soil sampling device, which can directly take out the sampling cylinder for saving the soil sample. The sampling cylinder is sealed at both ends with a cover. In this way, the collected soil sample is saved in the sampling cylinder, avoiding the damage caused by secondary loading and taking of the soil sample. However, compared with the present patent, the sampling device may leak out before the two ends of the sampling cylinder are sealed, causing disturbance of the sand. The patent application "Tread pressure type undisturbed soil sampler (CN201910595389.1)" provides a tread pressure type undisturbed soil sampler. After the tread pressure type undisturbed soil sampler is taken out of the soil, the lead screw is rotated and the sample ring is smoothly pushed out of the sample ring. This can effectively avoid large-area disturbance of the soil. However, the sample ring cannot be directly placed into the shear box for indoor direct shear test. After the sample is pushed into the shear box, the undisturbed soil is squeezed, causing the structure of the soil to change. The patent application "Undisturbed soil sampler and sampling method (CN201610505355.5)" provides an undisturbed soil sampler. The soil body is cut by the sampler, which is convenient to take out and can well reduce the disturbance of the undisturbed soil sample. However, compared with the present patent, the sample taken out by the device cannot be directly placed into the shear box for test. The patent application "Undisturbed soil sampler (CN202022279966.7)" provides an undisturbed soil sampling device. The overall length of the device is adjustable and suitable for sampling at different depths. Compared with the present patent, if the soil is relatively soft during sampling, it may leak out of the cutting ring opening. The patent application "Portable undisturbed soil sampling device (CN202420347597.6)" discloses a portable undisturbed soil sampling device. The hydraulic power is used to penetrate and pull out the soil pipe, which is less destructive to the sample and has higher sampling success rate. Compared with the present patent, the soil is easy to leak out of the pipe opening during the pulling-out process of the soil pipe, causing loss or disturbance of the soil body. SUMMARY

[0003] The purpose of this invention is to provide a sampling method for undisturbed sand and soil, and to allow the sample to be placed in a shearing box along with a ring cutter after collection, thus solving the problem of soil disturbance during the sampling and collection process and greatly improving the accuracy of indoor shear tests. This invention proposes an undisturbed soil sampling device suitable for indoor direct shear tests.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An undisturbed soil sampling device suitable for indoor direct shear tests includes a flat-mouthed ring cutter, a bladed ring cutter, a sleeve, a rectangular cutting plate, a bladed cutting plate, a circular cover plate, and a flat-cornered cover plate.

[0006] The flat-edged ring cutter and the bladed ring cutter form a cylindrical structure, which is radially confined within the sleeve. The outer diameter of the cylindrical structure is equal to the inner diameter of the ring cutter in the laboratory.

[0007] Near the bottom end face of the bladed ring cutter, two through slots of equal width are radially formed. The width of the through slots is smaller than that of the bladed ring cutter. The plane formed by the two through slots on the same straight path penetrates the bladed ring cutter and is parallel to the bottom end face.

[0008] The flat-mouthed ring cutter has a circular cover plate at the top to seal the top opening of the cylindrical structure;

[0009] In the sampling state, the bladed cutting plate is inserted into the rectangular groove; in the laboratory, the flat-angled cover plate replaces the bladed cutting plate; both the bladed cutting plate and the flat-angled cover plate are used to seal the bottom opening of the cylindrical structure.

[0010] In the sampling state, the rectangular cutting plate is arranged on top of the circular cover plate and is connected to the bladed cutting plate.

[0011] As a further preferred embodiment, the outer wall of the bladed ring cutter is provided with a triangular groove, and the inner ring of the sleeve is provided with a triangular buckle corresponding to the triangular groove.

[0012] As a further preferred option, the end of the cutting plate inserted into the through slot has a cutting edge.

[0013] As a further preferred embodiment, the upper edge of the flat-edged ring cutter is provided with a circular inner step for placing a circular cover plate; the depth of the circular inner step is less than or equal to the thickness of the circular cover plate.

[0014] As a further preferred option, the bottom of the bladed ring cutter is a ring blade edge, and the through groove is located between the bladed ring cutter and the ring blade edge.

[0015] As a further preferred option, the rectangular cutting plate and the bladed cutting plate are connected by bolts and bolt shanks.

[0016] As a further preferred embodiment, four bolts and bolt rods are provided between the rectangular cutting plate and the bladed cutting plate.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. After sampling, cover the top and bottom of the ring cutter with a cover plate to prevent the sand from leaking out due to its loose texture. At the same time, the sample will not overflow before being placed into the shear box.

[0019] 2. In this utility model, after the sample is taken, the cutting plate is placed on the ring blade and fixed with bolts, thus integrating the sampling device and the collection device into one unit, which greatly reduces the disturbance of the soil during the sample collection process.

[0020] 3. The outer diameter of the ring cutter in this test apparatus is approximately equal to the inner diameter of the indoor ring cutter. After collecting the sample, the flat-edged ring cutter and the bladed ring cutter can be directly placed into the upper and lower shear boxes of the indoor straight shear to make the test results more accurate. Attached Figure Description

[0021] Figure 1 This is a quarter-section structural diagram of the flat-edged ring cutter and the bladed ring cutter of this utility model;

[0022] Figure 2 This is a top view schematic diagram of the flat-edged ring cutter and the bladed ring cutter of this utility model;

[0023] Figure 3 This is a front view structural diagram of the flat-edged ring cutter and the bladed ring cutter of this utility model;

[0024] Figure 4 This is a right-side structural schematic diagram of the flat-edged ring cutter and the bladed ring cutter of this utility model;

[0025] Figure 5 This is a schematic diagram of a quarter-section of the sleeve of this utility model;

[0026] Figure 6 This is a top view of the sleeve structure of this utility model;

[0027] Figure 7 This is a front view structural diagram of the sleeve of this utility model;

[0028] Figure 8 This is a three-dimensional structural diagram of the cutting plate structure of this utility model;

[0029] Figure 9 This is a top view of the cutting plate structure of this utility model;

[0030] Figure 10 This is a front view schematic diagram of the cutting plate structure of this utility model;

[0031] Figure 11 It is right view schematic view of cutting plate structure of the utility model;

[0032] Figure 12 It is three-dimensional structure schematic view of round cover plate of the utility model;

[0033] Figure 13 It is three-dimensional structure schematic view of flat angle cover plate of the utility model;

[0034] Figure 14 It is three-dimensional structure schematic view of round cover plate of the utility model;

[0035] Figure 15 It is three-dimensional structure schematic view of flat angle cover plate of the utility model;

[0036] In the drawing: 1, flat ring cutter, 2, ring cutter with blade, 3, triangular recess; 4, ring cutter blade; 5, through groove; 6, triangular buckle; 7, sleeve; 8, bolt; 9, bolt rod; 10, rectangular cutting plate; 11, cutting plate with blade; 12, blade edge; 13, round cover plate; 14, flat angle cover plate; 15, round inner step. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0038] The utility model relates to a undisturbed soil sampling device suitable for indoor direct shear test, including flat ring cutter 1, ring cutter with blade 2, sleeve 7, cutting plate (rectangular cutting plate 10 and cutting plate with blade 11), round cover plate 13, flat angle cover plate 14.

[0039] Flat ring cutter 1 and ring cutter with blade 2 form the ring cutter of cylindrical structure in up and down, the cylindrical structure is radially limited in sleeve 7, and the outer diameter of the cylindrical structure is equal to the inner diameter of the ring cutter in the laboratory;

[0040] The outer diameter of flat ring cutter 1 and ring cutter with blade 2 is 61.8 millimeters, the height is 10 millimeters, and the thickness is 1 millimeter, before sampling, two small ring cutters are stuck together by adhesive tape, before starting indoor shear test, the adhesive tape is cut open along the middle of the connecting gap of two small ring cutters by small knife, so that indoor direct shear test can be carried out smoothly;

[0041] The outer wall of ring cutter with blade 2 is provided with triangular recess 3, the inner circle of sleeve 7 is provided with triangular buckle 6 corresponding to triangular recess 3, sleeve 7 is tightly sleeved on the outside of flat ring cutter 1 and ring cutter with blade 2, and the ring cutter is fixed by triangular recess 3 and triangular buckle 6.

[0042] The height of sleeve 7 is less than or equal to the ring cutter of cylindrical structure.

[0043] The blade ring cutter 2 is provided with two equal-width through grooves 5 near the bottom end face, the groove width of the through grooves 5 is smaller than the blade ring cutter 2, the two through grooves 5 are located on the same straight path to form a plane penetrating the blade ring cutter 2, and the plane is parallel to the bottom end face;

[0044] The bottom of the blade ring cutter 2 is a cutter blade 4, and the through grooves 5 are located between the blade ring cutter 2 and the cutter blade 4;

[0045] The blade ring cutter 2 and the cutter blade 4 have two connecting parts, and the triangular grooves 3 are located inside the two connecting parts, so that one can be arranged at each end of the connecting part, and a total of four are arranged on the two connecting parts.

[0046] The top of the flat ring cutter 1 is provided with a circular cover plate 13 for plugging the top opening of the cylindrical structure;

[0047] The upper edge of the flat ring cutter 1 is provided with a circular inner step 15 for placing the circular cover plate 13; the depth of the circular inner step 15 is less than or equal to the thickness of the circular cover plate 13.

[0048] In the sampling state, the blade cutting plate 11 is inserted into the rectangular groove 5, and the blade cutting plate 11 moves in the through groove 5; in the laboratory, the flat cover plate 14 replaces the blade cutting plate 11; the blade cutting plate 11 and the flat cover plate 14 are both used to plug the bottom opening of the cylindrical structure;

[0049] One end of the blade cutting plate 11 inserted into the through groove 5 has a blade edge 12.

[0050] In the sampling state, the rectangular cutting plate 10 is arranged on the top of the circular cover plate 13 and is connected with the blade cutting plate 11.

[0051] The diameter of the circular cover plate 13 is equal to 59.8 mm, and the thickness is 1 mm; the flat cover plate 14 is an approximate elliptical cover plate with a major axis of 61.8 mm and a minor axis of 60.8 mm; after sampling is completed, the circular cover plate 13 is covered on the surface of the circular inner step 15, and the flat cover plate 14 covers the lower surface of the blade ring cutter 2;

[0052] The rectangular cutting plate 10 and the blade cutting plate 11 are connected by bolts 8 and bolt rods 9, and four bolts 8 and bolt rods 9 are arranged between the rectangular cutting plate 10 and the blade cutting plate 11 and are evenly distributed around the flat ring cutter 1 and the blade ring cutter 2.

[0053] The rectangular cutting plate 10 and the blade cutting plate 11 are high-strength plates with a length of 100 mm, a width of 59.8 mm and a thickness of 1 mm, and are provided with four bolt holes; the blade cutting plate 11 is provided with a blade edge 12 for cutting soil in the through groove 5; and the rectangular cutting plate 10 is fixed on the flat ring cutter 1 by means of the bolts 8, and the blade cutting plate 11 is fixed in the through groove 5.

[0054] The outer diameters of the flat ring cutter 1 and the blade ring cutter 2 are equal to the inner diameter of the shearing box.

[0055] The specific implementation process of the utility model is as follows: first, after determining the sampling site, the flat ring cutter 1 and the blade ring cutter 2 are connected together by means of adhesive tape, the sleeve 7 is tightly sleeved on the outer wall of the flat ring cutter 1 and the blade ring cutter 2 through the connection of the triangular groove 3 and the triangular buckle 6, the sleeve 7 is gently pressed into the sand soil by hand, the sand soil around the sleeve 7 is gently scraped off by hand, the upper surface of the flat ring cutter 1 is scraped by the circular cover plate 13, and the circular cover plate 13 is adhered to the upper surface of the flat ring cutter 1 by means of adhesive tape; at this time, the sand soil around the lower surface of the blade ring cutter 2 is gently scraped off, the through groove 5 is leaked, the blade cutting plate 11 is pushed by hand, the sand soil is cut along the through groove 5, when the blade cutting plate 11 completely covers the lower surface of the blade ring cutter 2, the blade cutting plate 11 is pressed by hand, at the same time, the rectangular cutting plate 10 is placed on the circular cover plate 13, the bolt rod holes of the upper and lower cutting plates are aligned, then four bolt rods 9 are inserted through the cutting plates, the cutting plates are fixed together by means of tightening the bolts 8, after arriving at the laboratory, the sampler is turned over, the bolts 9 are unscrewed, the blade cutting plate 11 is pulled out, the flat corner cover plate 14 is along the through groove 5, then the sleeve 7 is pulled out by pressing the flat corner cover plate 14 by the left hand, subsequently, the flat corner cover plate 14 is fixed in the through groove by means of adhesive tape, at this time, the flat ring cutter 1, the blade ring cutter 2, the circular cover plate 13 and the flat corner cover plate 14 become an integral whole, and are directly placed in the shearing box, before doing the direct shear test, the adhesive tape in the middle of the flat ring cutter 1 and the blade ring cutter 2 is scraped off by means of a small knife, and the test is prepared.

[0056] The utility model uses the cover plate to cover the upper and lower surfaces of the ring cutter after sampling, prevents the sand soil from leaking out due to the loose condition of the sand soil itself, simultaneously, the sample will not overflow before being placed in the shearing box, ensures the accuracy of the indoor test, and solves the disturbance problem in the prior art taking undisturbed soil.

[0057] The above only describes the preferred specific implementation mode of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. An undisturbed soil sampling device suitable for use in an indoor direct shear test, characterized by: It comprises a flat ring cutter (1), a blade ring cutter (2), a sleeve (7), a rectangular cutting plate (10), a blade cutting plate (11), a circular cover plate (13), and a flat angle cover plate (14). The flat ring cutter (1) and the blade ring cutter (2) form a cylindrical structure, which is radially limited in the sleeve (7), and the outer diameter of the cylindrical structure is equal to the inner diameter of the laboratory ring cutter. The blade ring cutter (2) is provided with two through grooves (5) of equal width along the radial direction near the bottom end face, the groove width of the through grooves (5) is smaller than that of the blade ring cutter (2), the two through grooves (5) are located on the same straight line path to form a plane penetrating the blade ring cutter (2), and the plane is parallel to the bottom end face. The flat ring cutter (1) is provided with a circular cover plate (13) at the top for plugging the top opening of the cylindrical structure. In the sampling state, the blade cutting plate (11) is inserted into the through groove (5); in the laboratory, the flat angle cover plate (14) replaces the blade cutting plate (11); both the blade cutting plate (11) and the flat angle cover plate (14) are used to plug the bottom opening of the cylindrical structure. In the sampling state, the rectangular cutting plate (10) is arranged on the top of the circular cover plate (13) and is connected with the blade cutting plate (11).

2. The undisturbed soil sampling device suitable for indoor direct shear test according to claim 1, characterized in that: The outer wall of the blade ring cutter (2) is provided with a triangular groove (3), and the inner circle of the sleeve (7) is provided with a triangular buckle (6) corresponding to the triangular groove (3).

3. The undisturbed soil sampling device suitable for indoor direct shear test according to claim 1, characterized in that: One end of the blade cutting plate (11) inserted into the through groove (5) is provided with a blade edge (12).

4. The undisturbed soil sampling device suitable for indoor direct shear test of claim 1, wherein: The upper edge of the flat ring cutter (1) is provided with a circular inner step (15) for placing the circular cover plate (13); the depth of the circular inner step (15) is less than or equal to the thickness of the circular cover plate (13).

5. The undisturbed soil sampling device suitable for indoor direct shear test according to claim 1, characterized in that: The bottom of the blade ring cutter (2) is a ring cutter blade (4), and the through groove (5) is located between the blade ring cutter (2) and the ring cutter blade (4).

6. The undisturbed soil sampling device suitable for indoor direct shear test of claim 1, wherein: The rectangular cutting plate (10) and the blade cutting plate (11) are connected by bolts (8) and bolt rods (9).

7. An undisturbed soil sampling device suitable for use in indoor direct shear testing according to claim 6, characterized in that: The rectangular cutting plate (10) and the blade cutting plate (11) are provided with four bolts (8) and bolt rods (9).

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