Ocean sand triaxial test in-situ sampling device

Abstract

The utility model provides an ocean sand triaxial test in-situ sampling device which comprises an outer sleeve and an inner sleeve, the inner sleeve is embedded into the outer sleeve and fixed through a connecting piece, an annular cavity is formed between the two sleeve walls, a soil sample shearing sheet is arranged in the annular cavity, a soil sample inlet is formed in the bottom of the outer sleeve, an outlet is formed in the top of the inner sleeve, and a soil sample is contained in the inner sleeve; the inner bottom of the outer sleeve protrudes to support the inner sleeve, so that a channel is formed to communicate the soil sample space with the annular cavity and provide a motion path for the shearing sheet; a cylindrical rubber film and a protection plate are arranged in the inner sleeve and used for protecting a soil sample, and vacuumizing vent holes are formed in the wall of the inner sleeve. According to the device, after in-situ sampling, the cylindrical protection plate is detached, and then the triaxial test can be continuously carried out by the triaxial test machine, so that soil sample disturbance can be avoided to the greatest extent, and meanwhile, preparation and storage of the triaxial test sample are completed in the sampling process.

Description

Technical Field

[0001] The utility model relates to the technical field of the preparation technology of triaxial test specimens in geotechnical mechanics, and particularly relates to an in-situ sampling device for triaxial tests of marine sandy soil. Background Art

[0002] During the development of offshore wind power in China, especially in the construction of nearshore wind farms, it is inevitable to encounter sandy soil layers as the pile foundation bearing layers during engineering geological exploration of the seabed. Different from onshore wind power, the environment where offshore wind power is located is more severe, and the foundation is long-term affected by wave loads. Therefore, the determination and mastery of the shear mechanical properties and dynamic properties of marine sandy soil layers in the in-situ state are crucial for engineering design and safety.

[0003] Currently, in-situ tests such as standard penetration tests and static cone penetration tests are used to interpret mechanical parameters, and soil sample disturbance will occur during the soil sample collection process. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide an in-situ sampling device for triaxial tests of marine sandy soil, and it is expected to effectively solve the problems in the background art.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] An in-situ sampling device for triaxial tests of marine sandy soil, characterized in that: it includes an outer sleeve and an inner sleeve; the inner sleeve is embedded in the outer sleeve;

[0007] There is an annular cavity between the outer side wall of the inner sleeve and the inner side wall of the outer sleeve, and a plurality of connecting pieces are arranged between the outer side wall of the inner sleeve and the inner side wall of the outer sleeve to fix the inner sleeve in the outer sleeve;

[0008] The bottom of the outer sleeve has a soil sample inlet, and the top of the inner sleeve has a soil sample outlet; there is a space for accommodating the soil sample in the inner sleeve;

[0009] A plurality of soil sample shear slices are arranged in the annular cavity between the inner side wall of the outer sleeve and the outer side wall of the inner sleeve, a plurality of protrusions are arranged at the bottom inside the outer sleeve, and the protrusions are used to support the inner sleeve upward. The protrusions, the lower bottom surface of the inner sleeve, and the inner bottom surface of the outer sleeve form a channel connecting the soil sample accommodating space in the inner sleeve and the annular cavity between the inner side wall of the outer sleeve and the outer side wall of the inner sleeve. The channel of the annular cavity is the shear movement channel of the soil sample shear slices;

[0010] Inside the inner sleeve, a cylindrical rubber membrane and a cylindrical protection plate are successively arranged from the side wall towards the soil sample. A rubber membrane insertion groove is provided below the inner side wall of the inner sleeve, and a stepped portion is provided above the inner side wall of the inner sleeve. The upper part of the cylindrical rubber membrane is sleeved onto the stepped portion, and the lower part of the cylindrical rubber membrane is stuffed into the rubber membrane insertion groove. The upper end of the cylindrical protection plate has a flange protruding outwards, and the flange of the cylindrical protection plate is placed on the cylindrical rubber membrane on the stepped portion.

[0011] Vacuum pumping ventilation holes are provided on the side walls of the outer sleeve and the inner sleeve.

[0012] While adopting the above technical solutions, the present utility model can also adopt or combine the following technical solutions:

[0013] As a preferred technical solution of the present utility model: A connecting pin is provided at the bottom of the outer sleeve, and the connecting pin is used to connect two adjacent in-situ sampling devices for marine sand triaxial tests.

[0014] As a preferred technical solution of the present utility model: The cross-section of one end of the connecting pin is cruciform.

[0015] As a preferred technical solution of the present utility model: A pressing cover plate is provided at the top of the in-situ sampling device for marine sand triaxial tests, and the pressing cover plate is fixed to the inner sleeve and the outer sleeve respectively through connecting pins.

[0016] As a preferred technical solution of the present utility model: The outer sleeve includes a first ring piece and a second ring piece, and both the first ring piece and the second ring piece are arched to form a cylindrical outer sleeve by splicing.

[0017] As a preferred technical solution of the present utility model: The inner sleeve includes a first ring piece and a second ring piece, and both the first ring piece and the second ring piece are arched to form a cylindrical inner sleeve by splicing.

[0018] As a preferred technical solution of the present utility model: The bottom corners of the circumferential side of the inner sleeve are rounded.

[0019] As a preferred technical solution of the present utility model: There are four soil sample cutting slices, and the bottom of each soil sample cutting slice is a right-angled sector with the right angle facing downwards or towards the center of the in-situ sampling device for marine sand triaxial tests.

[0020] The present utility model provides an in-situ sampling device for marine sand triaxial tests, which has the following beneficial effects: After in-situ sampling, the cylindrical protection plate can be removed and the triaxial test can be continued on the triaxial testing machine, which can avoid soil sample disturbance to the greatest extent. At the same time, the preparation and preservation of triaxial specimens are completed during the sampling process. Description of the Drawings

[0021] Figure 1 This is a vertical sectional view of the in-situ sampling device for marine sand triaxial tests provided by the present utility model.

[0022] Figure 2 This is a cross-sectional view of the in-situ sampling device for marine sand triaxial tests provided by the present utility model at the stepped part of the inner sleeve.

[0023] Figure 3 This is a detailed view of the shearing process of the soil sample shear slice.

[0024] In the figure: 1 - outer sleeve; 2 - inner sleeve; 3 - connecting piece; 4 - soil sample shear slice; 5 - connecting pin; 6 - cylindrical protection plate; 7 - pressing cover plate; 8 - annular cavity; 9 - vacuum vent hole. Specific embodiments

[0025] The present utility model will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0026] As Figures 1-3 shown, an in-situ sampling device for marine sand triaxial tests includes an outer sleeve 1 and an inner sleeve 2; the inner sleeve 2 is embedded in the outer sleeve 1;

[0027] There is an annular cavity 8 between the outer side wall of the inner sleeve 2 and the inner side wall of the outer sleeve 1, and a plurality of connecting pieces 3 are provided between the outer side wall of the inner sleeve 2 and the inner side wall of the outer sleeve 1 to fix the inner sleeve 2 in the outer sleeve 1;

[0028] The bottom of the outer sleeve 1 has a soil sample inlet, and the top of the inner sleeve 2 has a soil sample outlet; the inner sleeve 2 has a space for accommodating the soil sample;

[0029] A plurality of soil sample shear slices 4 are provided in the annular cavity 8 between the inner side wall of the outer sleeve 1 and the outer side wall of the inner sleeve 2. A plurality of protrusions are provided at the bottom inside the outer sleeve 1, and the protrusions are used to support the inner sleeve 2 upward. The protrusions, the lower bottom surface of the inner sleeve 2, and the inner bottom surface of the outer sleeve 1 form a channel connecting the soil sample accommodation space inside the inner sleeve 2 and the annular cavity 8 between the inner side wall of the outer sleeve 1 and the outer side wall of the inner sleeve 2. The channel of the annular cavity 8 is the shearing movement channel of the soil sample shear slice 4;

[0030] A cylindrical rubber membrane and a cylindrical protection plate 6 are successively provided inside the inner sleeve 2 from the side wall towards the soil sample. A rubber membrane insertion groove is provided below the inner side wall of the inner sleeve 2, and a stepped part is provided above the inner side wall of the inner sleeve 2. The upper part of the cylindrical rubber membrane is sleeved on the stepped part, and the lower part of the cylindrical rubber membrane is inserted into the rubber membrane insertion groove; the upper end of the cylindrical protection plate 6 has a flange extending outwards, and the flange of the cylindrical protection plate 6 is placed on the cylindrical rubber membrane on the stepped part;

[0031] Vacuum vent holes 9 are provided on the side walls of the outer sleeve 1 and the inner sleeve 2.

[0032] The bottom of the outer sleeve 1 is provided with a connecting pin 5, and the connecting pin 5 is used to connect two adjacent in-situ sampling devices for marine sand triaxial tests.

[0033] One end of the connecting pin 5 has a cross-shaped end section.

[0034] The top of the in-situ sampling device for marine sand triaxial tests is provided with a pressing cover plate 7, and the pressing cover plate is fixed to the inner sleeve 2 and the outer sleeve 1 respectively through the connecting pin 5.

[0035] The outer sleeve 1 includes a first ring piece and a second ring piece, and both the first ring piece and the second ring piece are arched to be spliced to form the tubular outer sleeve 1.

[0036] The inner sleeve 2 includes a first ring piece and a second ring piece, and both the first ring piece and the second ring piece are arched to be spliced to form the tubular inner sleeve 2.

[0037] The bottom corners on the circumferential side of the inner sleeve 2 are rounded.

[0038] There are four soil sample cutting slices 4, and the bottom of each soil sample cutting slice 4 is a right-angled sector with the right angle set downward or towards the center of the in-situ sampling device for marine sand triaxial tests.

[0039] Specifically, the above in-situ sampling device for marine sand triaxial tests is implemented in the following manner:

[0040] The outer sleeve 1 and the inner sleeve 2 are fixed through a plurality of connecting pieces 3. A plurality of soil sample cutting slices 4 are arranged in the formed annular cavity 8. A rubber membrane insertion groove is provided below the inner side wall of the inner sleeve 2, and a step portion is provided above the inner side wall of the inner sleeve 2. The upper part of the tubular rubber membrane is sleeved on the step portion, and the lower part of the tubular rubber membrane is inserted into the rubber membrane insertion groove. When installing the rubber membrane, vacuum is pumped through the vacuum vent hole 9. The upper end of the tubular protection plate 6 has a flange protruding outward, and the flange of the tubular protection plate 6 is placed on the tubular rubber membrane on the step portion. During use, the four soil sample cutting slices 4 move closer to the center of the sampling device under the action of force, and the sampling of sand can be completed. The device can be connected to the top of the sampling device through the connecting pin 5 provided at the bottom to realize the sampling of sand at different depths.

[0041] The above specific implementation manners are used to explain and illustrate the present invention, and are only the preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and protection scope of the claims of the present invention fall within the protection scope of the present invention.

Claims

1. An in-situ sampling device for triaxial tests of marine sandy soil, characterized in that: It includes an outer sleeve (1) and an inner sleeve (2); the inner sleeve (2) is embedded in the outer sleeve (1). There is an annular cavity (8) between the outer side wall of the inner sleeve (2) and the inner side wall of the outer sleeve (1), and a plurality of connecting pieces (3) are provided between the outer side wall of the inner sleeve (2) and the inner side wall of the outer sleeve (1) to fix the inner sleeve (2) in the outer sleeve (1). The bottom of the outer sleeve (1) has a soil sample inlet, and the top of the inner sleeve (2) has a soil sample outlet; there is a space for accommodating the soil sample in the inner sleeve (2). A plurality of soil sample shear slices (4) are provided in the annular cavity (8) between the inner side wall of the outer sleeve (1) and the outer side wall of the inner sleeve (2). A plurality of protrusions are provided at the inner bottom of the outer sleeve (1), and the protrusions are used to support the inner sleeve (2) upward. The protrusions, the lower bottom surface of the inner sleeve (2), and the inner bottom surface of the outer sleeve (1) form a channel connecting the soil sample accommodation space in the inner sleeve (2) and the annular cavity (8) between the inner side wall of the outer sleeve (1) and the outer side wall of the inner sleeve (2). The channel of the annular cavity (8) is the shear movement channel of the soil sample shear slices (4). A cylindrical rubber membrane and a cylindrical protection plate (6) are sequentially arranged in the inner sleeve (2) from the side wall towards the soil sample; a rubber membrane insertion groove is provided below the inner side wall of the inner sleeve (2), and a step portion is provided above the inner side wall of the inner sleeve (2). The upper part of the cylindrical rubber membrane is sleeved on the step portion, and the lower part of the cylindrical rubber membrane is stuffed into the rubber membrane insertion groove; the upper end of the cylindrical protection plate (6) has a flange extending outwards, and the flange of the cylindrical protection plate (6) is placed on the cylindrical rubber membrane on the step portion. Vacuum pumping ventilation holes (9) are provided on the side walls of the outer sleeve (1) and the inner sleeve (2).

2. The in-situ sampling device for triaxial test of marine sandy soil according to claim 1, wherein: A connecting pin (5) is provided at the bottom of the outer sleeve (1), and the connecting pin (5) is used to connect two adjacent in-situ sampling devices for marine sand triaxial tests.

3. The in-situ sampling device for marine sand triaxial test according to claim 2, characterized in that: One end end section of the connecting pin (5) is cross-shaped.

4. The in-situ sampling device for marine sand triaxial test according to claim 1, wherein: A pressing cover plate (7) is provided at the top of the in-situ sampling device for marine sand triaxial tests, and the pressing cover plate is fixed to the inner sleeve (2) and the outer sleeve (1) respectively through the connecting pin (5).

5. The in-situ sampling device for triaxial test of marine sandy soil according to claim 1, wherein: The outer sleeve (1) includes a first ring piece and a second ring piece, and both the first ring piece and the second ring piece are arched to be spliced to form a cylindrical outer sleeve (1).

6. The in-situ sampling device for triaxial tests of marine sandy soil according to claim 1, wherein: The inner sleeve (2) includes a first ring piece and a second ring piece, and both the first ring piece and the second ring piece are arched to be spliced to form a cylindrical inner sleeve (2).

7. The in-situ sampling device for triaxial test of marine sandy soil according to claim 1, characterized in that: The bottom corners of the circumferential side of the inner sleeve (2) are rounded.

8. The in-situ sampling device for triaxial test of marine sandy soil according to claim 1, wherein: There are four soil sample shear slices (4), and the bottom of each soil sample shear slice (4) is a right-angled sector with the right angle facing downwards or towards the center of the in-situ sampling device for marine sand triaxial tests.

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