Sealing device for rock-soil penetration test

Abstract

The utility model discloses a sealing device for a rock-soil penetration test, and belongs to the technical field of geotechnical engineering test piece testing. Comprising a box bottom structure and a box cover structure, the box bottom structure comprises a box bottom rubber sleeve and a bottom groove plate, and the upper end face of the box bottom rubber sleeve is of an open structure; the bottom groove plate is embedded in the lower end face of the box bottom rubber sleeve and is flush with the lower end face of the box bottom rubber sleeve, and the bottom groove plate is in sealed connection with the seam of the box bottom rubber sleeve. The box cover structure comprises a box cover rubber sleeve and a cover groove plate, the lower end face of the box cover rubber sleeve is of an open structure, the cover groove plate is embedded in the upper end face of the box cover rubber sleeve and is flush with the upper end face of the box cover rubber sleeve, and the joint of the cover groove plate and the box cover rubber sleeve is connected in a sealed mode. The bottom trough plate is provided with a water outlet hole, and the cover trough plate is provided with a water inlet hole; the rock-soil test piece is placed in the box bottom structure, and the box cover structure sleeves the outer sides of the rock-soil test piece and the box bottom structure from top to bottom and is used for sealing the whole rock-soil test piece; according to the utility model, the problems of complex sealing process and large test result error in the existing geotechnical engineering penetration test are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of geotechnical engineering specimen testing, in particular to a geotechnical penetration test sealing device. Background Art

[0002] In geotechnical engineering, excavated rock and soil are easily penetrated by water vapor in the air and water in the environment, causing changes in rock and soil performance and structural stability. To accurately evaluate the mechanical properties of rock and soil in engineering, it is necessary to conduct penetration tests on the rock and soil specimens. Currently, for the convenience of sealing and coring, penetration tests on geotechnical engineering specimens mostly use cylindrical specimens. The specimen surface is sealed with plastic wrap and then placed in the test instrument for penetration testing. This method uses pseudo-triaxial stress loading and cannot effectively reflect the three-dimensional geostress environment in geotechnical engineering. In other words, it cannot accurately test the permeability performance of the specimen under triaxial conditions. When using a rectangular or cube rock mass test, six external surfaces are involved: in addition to the upper and lower end faces, there are also four side faces on all four sides, as well as the edges between the faces. Since the surfaces are not smooth and have small cracks, conventional permeability tests are prone to water seepage into the small cracks on the specimen surface, affecting the accuracy of the permeability test. However, using ordinary sealing methods, water cross-flow is prone to occur on various surfaces and edges, resulting in large errors in permeability tests and being unable to effectively guide the evaluation of the mechanical properties of rock and soil.

[0003] In the existing sealing problem of geotechnical specimen penetration test, the phenomenon of loose sealing often occurs. There are also many patented technologies that improve the sealing effect, but there are characteristics such as complex processing procedures. For example: CN201510080598.4 discloses "A high-temperature and high-pressure true triaxial fracturing seepage test device and test method for coal rock", which uses ultra-high temperature resistant sealant to be applied on the surface of the specimen for sealing. The application process of this technology is relatively complicated and cannot be applied evenly, and the error of the penetration test result is relatively large. CN202010851510.5 discloses "A sample tube sealing structure for rock and soil sample permeability detection", which uses an inflatable airbag and a paraffin sleeve to seal the gap on the edge of the specimen, and then puts it into the sealing tube structure for testing. The sealing tube added by this technology is relatively expensive, and the paraffin sealing process is also relatively complicated, which cannot be widely used in geotechnical engineering tests. Utility Model Content

[0004] The utility model overcomes the shortcomings of the prior art and proposes a rock and soil penetration test sealing device, which solves the problems of complicated sealing procedures and large test result errors in the current rock and soil engineering penetration test.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions.

[0006] A geotechnical permeability test sealing device comprises a box bottom structure and a box cover structure, wherein the box bottom structure comprises a box bottom rubber sleeve and a bottom groove plate, the upper end surface of the box bottom rubber sleeve is an open structure; the bottom groove plate is embedded in the lower end surface of the box bottom rubber sleeve and is flush with the lower end surface of the box bottom rubber sleeve, and the bottom groove plate is sealed and connected to the box bottom rubber sleeve at the joint; the box cover structure comprises a box cover rubber sleeve and a cover groove plate, the lower end surface of the box cover rubber sleeve is an open structure, the cover groove plate is embedded in the upper end surface of the box cover rubber sleeve and is flush with the upper end surface of the box cover rubber sleeve, and the cover groove plate is sealed and connected to the box cover rubber sleeve at the joint; the bottom groove plate is provided with a water outlet hole, and the cover groove plate is provided with a water inlet hole; a geotechnical specimen is placed in the box bottom structure, and the box cover structure is sleeved on the outside of the geotechnical specimen and the box bottom structure from top to bottom to seal the entire geotechnical specimen.

[0007] Furthermore, the inner diameter of the rubber sleeve at the bottom of the box is equivalent to the size of the geotechnical specimen, and the inner diameter of the rubber sleeve at the cover of the box is equivalent to the outer diameter of the rubber sleeve at the bottom of the box.

[0008] Furthermore, the lower end surface of the box bottom rubber sleeve is provided with a recessed area, the size of the recessed area is comparable to the size of the bottom groove plate; the bottom groove plate is located in the recessed area; the upper end surface of the box cover rubber sleeve is provided with a raised area, the size of the raised area is comparable to the size of the cover groove plate; the cover groove plate is located in the raised area.

[0009] Furthermore, the joints between the bottom groove plate and the rubber sleeve at the bottom of the box, as well as the joints between the cover groove plate and the rubber sleeve at the cover of the box are tightly sealed with sealant.

[0010] Furthermore, the water outlet is arranged at the center of the bottom trough plate, and the water inlet is arranged at the center of the cover trough plate.

[0011] Furthermore, the rubber sleeve on the bottom of the box and the rubber sleeve on the cover are both transparent square rubber sleeves.

[0012] Furthermore, the bottom trough plate and the cover trough plate are hard plates with consistent specifications and dimensions.

[0013] The beneficial effects of the present invention compared to the prior art are as follows:

[0014] 1. During the geotechnical penetration test, it is only necessary to place the geotechnical specimen in the box bottom structure and the box cover structure and then conduct the penetration test. The sealing process is simple and can be widely used in geotechnical engineering tests.

[0015] 2. The rubber sleeve at the bottom of the box and the rubber sleeve at the cover can be made of transparent material, so that the penetration effect of the rock and soil specimen can be directly observed during the test.

[0016] 3. In the structure, the bottom trough plate is placed in the concave area of ​​the bottom rubber sleeve of the box, and the cover trough plate is placed in the convex area of ​​the cover rubber sleeve of the box. The concave area and convex area may not change the inner diameter size of the bottom structure and the cover structure of the box; then the joints of the four sides of the bottom trough plate and the cover trough plate are tightly sealed with sealant. The sealant can also make the upper and lower end faces of the geotechnical specimen tightly sealed with the bottom structure and the cover structure of the box, play the role of sealing the geotechnical specimen as a whole, and prevent water on the end face of the geotechnical specimen from flowing to the four sides and edges, thereby improving the accuracy of the permeability test and making the test results more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of the rock and soil penetration test sealing device of the utility model;

[0018] Figure 2 This is a top view of the rock and soil penetration test sealing device of the utility model;

[0019] Figure 3 This is a three-dimensional diagram of the box bottom structure of the rock and soil penetration test sealing device of the utility model;

[0020] Figure 4 This is a three-dimensional diagram of the box cover structure of the rock and soil penetration test sealing device of the utility model;

[0021] In the figure: 1—box bottom rubber sleeve; 2—box cover rubber sleeve; 3—bottom groove plate; 4—cover groove plate; 5—sealant; 6—water outlet; 7—water inlet. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and accompanying drawings. 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. The technical solutions of the present invention will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0023] This embodiment provides a geotechnical engineering permeability test. The geotechnical specimen is a cube with a size of 150mm×150mm×150mm. The sealing device proposed by the present invention is used during the test. Figures 1-4 As shown, this embodiment provides a rock and soil penetration test sealing device, including a box bottom structure and a box cover structure.

[0024] The box bottom structure consists of a box bottom rubber sleeve 1 and a bottom groove plate 3. The box bottom rubber sleeve 1 is a cubic rubber sleeve with an open upper end face. The lower end face of the box bottom rubber sleeve 1 is provided with a square recessed area, and the size of the recessed area is comparable to the size of the bottom groove plate 3; the box lid structure consists of a box lid rubber sleeve 2 and a cover groove plate 4. The box lid rubber sleeve 2 is a cubic rubber sleeve with an open lower end face. The upper end face of the box lid rubber sleeve 2 is provided with a raised area, and the size of the raised area is comparable to the size of the cover groove plate 4.

[0025] In the box bottom structure, such as Figure 3 A water outlet 6 is located in the center of the bottom trough plate 3. After the bottom trough plate 3 is placed into the recessed area of ​​the bottom rubber sleeve 1, the seams along the four sides of the bottom trough plate 3 are tightly sealed with sealant 5. During on-site processing, the size of the water outlet 6 should match the pipe of the permeation tester. Do not overfill the sealant 5; simply fill the seams along the four sides of the bottom trough plate 3 until they are flush with the upper surface of the lower end of the bottom rubber sleeve 1.

[0026] In the box cover structure, such as Figure 4 A water inlet hole 7 is located in the center of the cover trough plate 4. After the cover trough plate 4 is placed into the raised area of ​​the cover rubber sleeve 2, the seams along the four sides of the cover trough plate 4 are tightly sealed with sealant 5. During on-site processing, the size of the water inlet hole 7 should match the pipe of the permeation tester. Do not overfill the sealant 5; simply fill the seams along the four sides of the cover trough plate 4 until they are flush with the underside of the upper end surface of the cover rubber sleeve 2.

[0027] The inner diameter of the bottom rubber sleeve 1 is comparable to the geotechnical specimen, and the inner diameter of the lid rubber sleeve 2 is comparable to the outer diameter of the bottom rubber sleeve 1. During on-site fabrication, the dimensions of each component must match the geotechnical specimen to prevent water cross-flow during the test and improve the accuracy of the permeability test.

[0028] Among them, the bottom rubber sleeve 1 and the cover rubber sleeve 2 are both square rubber sleeves made of transparent material with a certain elasticity; the concave area of ​​the lower end face of the bottom rubber sleeve 1 should be formed by a compressor in one step according to the size of the selected bottom groove plate 3, and the raised area of ​​the cover rubber sleeve 2 should be formed by a compressor in one step according to the size of the selected cover groove plate 4; in order to facilitate processing and component replacement, it is recommended that the bottom groove plate 3 and the cover groove plate 4 use groove plates of uniform specifications and sizes.

[0029] The utility model provides a rock and soil penetration test sealing device, which is not only suitable for cubic rock and soil specimens, but also for rectangular rock and soil specimens. It only needs to adjust the height of the box bottom rubber sleeve 1 and the box cover rubber sleeve 2 to be equivalent to the height of the rock and soil specimen.

[0030] In this embodiment, both the bottom rubber sleeve 1 and the lid rubber sleeve 2 are cube-shaped transparent rubber sleeves with one end open. The sleeve wall thickness is 5 mm. The inner diameter of the bottom rubber sleeve 1 is 150 mm × 150 mm × 150 mm (equal to the size of the geotechnical specimen), and the inner diameter of the lid rubber sleeve 2 is 160 mm × 160 mm × 150 mm (equal to the outer diameter of the bottom rubber sleeve 1). The concave area of ​​the bottom rubber sleeve 1 and the raised area of ​​the lid rubber sleeve 2 are the same size, both 140 mm × 140 mm × 2 mm. The bottom groove plate 3 and the lid groove plate 4 have the same specifications and dimensions, 140 mm × 140 mm × 2 mm (which fits perfectly into the concave area of ​​the bottom rubber sleeve 1 and the raised area of ​​the lid rubber sleeve 2).

[0031] The working principle of this device is:

[0032] During the permeability test, the geotechnical specimen is first placed in the box bottom structure, the box bottom rubber sleeve 1 is wrapped and fitted to the four side walls of the geotechnical specimen, and the bottom trough plate 3 is located at the bottom of the geotechnical specimen; then the box cover structure is put on the outside of the geotechnical specimen and the box bottom structure from top to bottom to seal the entire geotechnical specimen; finally, it is placed in the permeability testing machine, and the seepage test is carried out after the pipe of the permeability testing machine is connected to the water outlet 6 and the water inlet 7.

[0033] Since the bottom trough plate 3 and the cover trough plate 4 are hard trough plates, they can be connected to the pipeline more tightly, and the upper and lower end faces of the geotechnical specimen can bear better force during the seepage test. The bottom rubber sleeve 1 and the cover rubber sleeve 2 can wrap the geotechnical specimen more closely and tightly. When the geotechnical specimen is under pressure, the sealant 5 at the joint of the bottom rubber sleeve 1 and the bottom trough plate 3 and the sealant 5 at the joint of the cover rubber sleeve 2 and the cover trough plate 4 are pressed more tightly, which can prevent water entering the end face of the geotechnical specimen from flowing to the four sides and edges of the specimen, so that it can penetrate gradually and slowly, thereby improving the accuracy of the penetration test.

[0034] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. A sealing device for rock and soil penetration test, characterized in that: The invention comprises a box bottom structure and a box cover structure, wherein the box bottom structure comprises a box bottom rubber sleeve (1) and a bottom groove plate (3), wherein the upper end surface of the box bottom rubber sleeve (1) is an open structure; the bottom groove plate (3) is embedded in the lower end surface of the box bottom rubber sleeve (1) and is flush with the lower end surface of the box bottom rubber sleeve (1), and the bottom groove plate (3) and the box bottom rubber sleeve (1) are sealed at the joint; the box cover structure comprises a box cover rubber sleeve (2) and a cover groove plate (4), wherein the lower end of the box cover rubber sleeve (2) is The box body is an open structure, the cover groove plate (4) is embedded in the upper end surface of the box cover rubber sleeve (2) and is flush with the upper end surface of the box cover rubber sleeve (2), and the cover groove plate (4) and the box cover rubber sleeve (2) are sealed at the joint; the bottom groove plate (3) is provided with a water outlet hole (6), and the cover groove plate (4) is provided with a water inlet hole (7); the geotechnical specimen is placed in the box bottom structure, and the box cover structure is sleeved from top to bottom on the outer side of the geotechnical specimen and the box bottom structure to seal the entire geotechnical specimen.

2. A rock and soil penetration test sealing device according to claim 1, characterized in that: The inner diameter of the box bottom rubber sleeve (1) is equivalent to the size of the geotechnical specimen, and the inner diameter of the box cover rubber sleeve (2) is equivalent to the outer diameter of the box bottom rubber sleeve (1).

3. A rock and soil penetration test sealing device according to claim 1, characterized in that: The lower end surface of the box bottom rubber sleeve (1) is provided with a recessed area, the size of which is equivalent to the size of the bottom groove plate (3); the bottom groove plate (3) is located in the recessed area; the upper end surface of the box cover rubber sleeve (2) is provided with a raised area, the size of which is equivalent to the size of the cover groove plate (4); the cover groove plate (4) is located in the raised area.

4. A rock and soil penetration test sealing device according to claim 1 or 3, characterized in that: The joint between the bottom groove plate (3) and the box bottom rubber sleeve (1), as well as the joint between the cover groove plate (4) and the box cover rubber sleeve (2) are both tightly sealed with a sealant (5).

5. A rock and soil penetration test sealing device according to claim 1, characterized in that: The water outlet hole (6) is arranged at the center of the bottom trough plate (3), and the water inlet hole (7) is arranged at the center of the cover trough plate (4).

6. A rock and soil penetration test sealing device according to claim 1, characterized in that: The box bottom rubber sleeve (1) and the box cover rubber sleeve (2) are both transparent square rubber sleeves.

7. A rock and soil penetration test sealing device according to claim 1, characterized in that: The bottom groove plate (3) and the cover groove plate (4) are hard plates with the same specifications and dimensions.

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