A device for preparing a rock-like sample containing defects

Abstract

The present application relates to the field of rock mechanics test research, and discloses a kind of preparation device of rock-like sample containing defect, including base and forming cylinder, forming cylinder is detachably connected with base, forming cylinder is equipped with several forming holes, forming cylinder is detachably connected with several forming mechanisms, each forming mechanism includes forming inner tube and two rotating connection units, forming inner tube includes first connecting part and second connecting part, first connecting part is slidably and detachably connected with second connecting part, both ends of forming inner tube are rotatably and detachably connected with two rotating connection units.The technical scheme of the present application facilitates sample production, ensures uniform sample size and good homogeneity, reduces the difficulty of defect production, and ensures complete consistency of hole defect size and position without disturbing the internal structure of the sample to some extent.

Description

Technical Field

[0001] This invention relates to the field of rock mechanics experimental research, specifically to an apparatus for preparing defective rock samples. Background Technology

[0002] In recent years, with the needs of mineral resource exploration and development, energy development, transportation engineering, urban construction and underground space development, the scale of rock engineering has become larger and larger, and the rock mechanics problems involved have become more and more complex.

[0003] Mining voids formed by human activities, excavated chambers, and karst caves formed by natural erosion all severely damage the integrity of rock masses, resulting in cavities within the rock mass. These cavities are generally large in size, vary in shape, and pose a high degree of danger. Engineering construction around rock masses with such defects carries the risk of engineering instability. In order to effectively evaluate the stability of rock masses with cavities, it is necessary to conduct mechanical testing on rock samples with cavities to effectively reveal the mechanical deformation characteristics and failure patterns of rocks with cavities.

[0004] Currently, the preparation of porous rock samples is a challenge and a bottleneck restricting the progress of experimental research on porous rocks. The existing sampling method for porous rock samples is to obtain samples by core drilling and to create pore defects with the help of drilling machines and water jets. The disadvantages of this technical solution are: (1) sampling is inconvenient and the sample size is inconsistent, resulting in poor homogeneity; (2) when creating defects, the operation is difficult, it is difficult to ensure that the size and position of the pore defects are completely consistent, and it is easy to cause a certain degree of disturbance to the internal structure of the sample. Summary of the Invention

[0005] The present invention aims to provide a device for preparing rock samples containing defects, so as to facilitate sample preparation, make the sample size consistent and homogeneous, reduce the difficulty of making defects, and ensure that the size and position of the pore defects are completely consistent, and not easily cause a certain degree of disturbance to the internal structure of the sample.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a preparation device for a rock sample containing defects, comprising a base and a forming cylinder, the forming cylinder being detachably connected to the base, the forming cylinder having a plurality of forming holes, and a plurality of forming mechanisms being detachably connected to the forming cylinder, each forming mechanism comprising a forming inner tube and two rotating connecting units, the forming inner tube comprising a first connecting part and a second connecting part, the first connecting part and the second connecting part being slidably and detachably connected, and the two ends of the forming inner tube being rotatably and detachably connected to the two rotating connecting units respectively.

[0007] The beneficial effects of this solution are as follows: When using it, first determine the installation position of the molding mechanism, then connect the first connecting part and the second connecting part, apply release agent to the base, molding cylinder and molding inner tube to seal the remaining useless molding holes, and then pour. After the rock sample containing defects has solidified, disassemble the molding mechanism and molding cylinder to obtain the rock sample containing defects. This technical solution has the advantages of simple operation and high sample preparation efficiency.

[0008] Compared with existing technologies, the advantages of this technical solution are:

[0009] 1. This technical solution has several forming holes on the forming cylinder. By adjusting the inner forming tube to pass through different forming holes, it is possible to prepare hole defects with different tilt angles, and the height of the hole defects can be determined according to actual needs.

[0010] 2. Because this technical solution has several forming mechanisms, it can simultaneously manufacture multiple complex hole defects within the same forming cylinder;

[0011] 3. In this technical solution, since both ends of the formed inner tube are rotatably connected to two rotating connection units, it is convenient to adjust the formed inner tube.

[0012] 4. Compared with existing core sampling methods, the defective rock samples prepared by this technical solution are more uniform in size and have better homogeneity;

[0013] 5. Compared with existing methods for fabricating pore defects, this technical solution can determine the fabrication size and location of pore defects, which facilitates parallel testing and reduces the error of parallel testing. In particular, it can significantly reduce test errors for the prefabrication of large-section pore defects and high-pressure, high-strength specimens. At the same time, the fabrication of pore defects is easy and will not disturb the internal structure of rock samples containing defects.

[0014] 6. Since the first connecting part and the second connecting part are slidably and detachably connected, when creating interconnected hole defects in the same plane, two molding mechanisms are used. One molding mechanism is first installed on the molding cylinder, and then the first connecting part of the other molding mechanism is placed against the installed molding inner tube. The second connecting part of the other molding mechanism is placed against the appropriate position on the installed molding inner tube, and then casting is performed. In this way, interconnected hole defects in the same plane can be created. Therefore, the molding inner tube is slidably and detachably connected by the first connecting part and the second connecting part, which not only allows for adjustment of the length of the molding inner tube, but also allows for the creation of interconnected hole defects in the same plane.

[0015] Furthermore, each rotating connection unit includes a positioning seat, a fixed seat, and a handle. The handle passes through the positioning seat and is detachably connected to the fixed seat. A universal ball is installed on the fixed seat, and a hollow rotating shaft is fixedly connected to the universal ball. Positioning beads are fixedly connected to both ends of the hollow rotating shaft, and the molded inner tube is rotatably connected to the positioning beads.

[0016] The beneficial effects of this solution are as follows: When using it, first determine the installation position of the rotating connection unit, then connect the first connection part and the second connection part, apply release agent to the base, molding cylinder and molding inner tube to seal the remaining useless molding holes, and then pour. After the rock sample containing defects has solidified, first remove the handle from the fixed seat, then remove the positioning seat from the molding cylinder, then remove the molding cylinder from the base, and finally pull the fixed seat and molding inner tube out of the sample to complete the preparation of the rock sample containing defects.

[0017] Due to the omnidirectional ball joint, the deflection angle of the inner tube can be adjusted by rotating the handle, making this technical solution applicable to the fabrication of samples with different deflection angles.

[0018] The positioning beads in this technical solution facilitate the installation and replacement of the molded inner tube.

[0019] Furthermore, the positioning seat includes a limiting part and a positioning part connected in sequence. The positioning part matches the shape of the forming hole and can be locked inside the forming hole.

[0020] The beneficial effects of this solution are as follows: Due to the setting of the positioning seat, the rotating connecting unit can be fixed in the molding hole by the positioning part. At the same time, the limiting part can limit the positioning seat to prevent the entire positioning seat from extending into the molding hole, which would be inconvenient for operation. Meanwhile, the positioning part can also block the molding hole to prevent the slurry from overflowing from the molding hole.

[0021] Furthermore, the forming cylinder includes several arc-shaped connecting parts, and the forming cylinder is a cylindrical structure formed by several arc-shaped connecting parts.

[0022] The beneficial effects of this scheme are as follows: since the molding cylinder is a cylindrical structure formed by several arc-shaped connecting parts, it is easy to demold the molding cylinder after the defective rock sample is made.

[0023] Furthermore, each arc-shaped connecting part has a slot at both ends along its axial direction, and the slots on adjacent arc-shaped connecting parts face opposite directions.

[0024] The beneficial effects of this solution are as follows: if the slot is not set, the grout will overflow from the adjacent arc-shaped connection during pouring, resulting in inconsistent shapes of the prepared samples and increasing the test error in parallel tests; the setting of the slot can avoid this problem.

[0025] Furthermore, the molded cylinder is fitted with a ring clamp.

[0026] The beneficial effects of this scheme are as follows: the setting of the ring hoop improves the stability of the forming cylinder, and prevents the forming cylinder from deforming when making defective rock samples, thereby affecting the prepared defective rock samples.

[0027] Furthermore, the shape of the forming hole is any one or more combinations of circles, squares, prisms, and polygons, and the forming mechanism matches the forming hole.

[0028] The beneficial effects of this solution are: according to actual needs, when preparing samples with different pore defects, different molding cylinders can be used to complete the preparation of samples with different pore defects.

[0029] Furthermore, a retaining ring is provided on the handle between the positioning seat and the fixed seat.

[0030] The beneficial effects of this solution are as follows: due to the setting of the retaining ring, when the fixed seat is rotated by the handle, wear between the fixed seat and the inner wall of the forming cylinder can be prevented, thereby extending the service life of the forming cylinder. Attached Figure Description

[0031] Figure 1 This is a three-dimensional diagram of an apparatus for preparing defective rock samples according to the present invention;

[0032] Figure 2 A 3D diagram showing the removal of a first arc-shaped connecting part and a second arc-shaped connecting part;

[0033] Figure 3 A 3D diagram of the forming mechanism;

[0034] Figure 4 A 3D view of the rotating connection unit;

[0035] Figure 5 This is a schematic diagram of the rotating connection unit. Detailed Implementation

[0036] The following detailed description illustrates the specific implementation method:

[0037] The reference numerals in the accompanying drawings include: base 1, molding cylinder 2, support part 3, fixing part 4, molding hole 5, ring 6, first arc-shaped connecting part 7, second arc-shaped connecting part 8, first slot 9, second slot 10, molding inner tube 11, first connecting part 12, second connecting part 13, positioning seat 14, limiting part 15, positioning part 16, handle 17, fixing seat 18, retaining ring 19, universal ball 20, hollow rotating shaft 21, positioning bead 22.

[0038] Example

[0039] like Figure 1 The apparatus shown is for preparing a defective rock sample, including a base 1, a forming cylinder 2, and several forming mechanisms.

[0040] like Figure 1 As shown, the longitudinal section of the base 1 is convex. The base 1 includes a support part 3 and a fixing part 4 connected in sequence. The support part 3 and the fixing part 4 are integrally formed. The fixing part 4 is located above the support part 3 and is coaxially arranged with the support part 3. The fixing part 4 has a cylindrical structure.

[0041] like Figure 1 and Figure 2 As shown, the outer diameter of the molding cylinder 2 is equal to the inner diameter of the fixing part 4. The inside of the molding cylinder 2 is a sample preparation cavity. The lower end of the molding cylinder 2 is inserted into the fixing part 4. Several molding holes 5 are opened on the molding cylinder 2. A ring 6 is sleeved on the outside of the molding cylinder 2. The inner diameter of the ring 6 is equal to the outer diameter of the molding cylinder 2. The ring 6 is used to fix the molding cylinder 2. Specifically, the forming cylinder 2 includes two first arc-shaped connecting parts 7 and two second arc-shaped connecting parts 8. The first arc-shaped connecting parts 7 are 1 / 8 of the circumference, and the second arc-shaped connecting parts 8 are 3 / 8 of the circumference. The outer surfaces of the first arc-shaped connecting parts 7 along both ends of their axial direction are provided with first slots 9, and the inner surfaces of the second arc-shaped connecting parts 8 along both ends of their axial direction are provided with second slots 10. Adjacent first arc-shaped connecting parts 7 and second arc-shaped connecting parts 8 can be spliced ​​together. The forming cylinder 2 is a cylindrical structure formed by the alternating first arc-shaped connecting parts 7 and second arc-shaped connecting parts 8. The forming holes 5 are distributed on the first arc-shaped connecting parts 7 and second arc-shaped connecting parts 8. The shape of the forming holes 5 can be any one or more combinations of circles, squares, rhombuses, and polygons. The size of the forming holes 5 can be adjusted according to actual needs.

[0042] like Figure 3-5As shown, each molding mechanism includes a molding inner tube 11 and two rotating connecting units. The molding inner tube 11 includes a first connecting part 12 and a second connecting part 13. The first connecting part 12 is inserted into the second connecting part 13 and can slide within the second connecting part 13. Each rotating connection unit includes a positioning seat 14, a handle 17, and a hollow rotating shaft 21. The positioning seat 14 includes a limiting part 15 and a positioning part 16 connected in sequence. The positioning part 16 can be locked in the forming hole 5. The left end of the handle 17 passes through the positioning seat 14 and is rotatably connected to the positioning seat 14. The left end of the handle 17 is threadedly connected to a fixing seat 18. A retaining ring 19 is interference-fitted on the handle 17 between the positioning seat 14 and the fixing seat 18. A universal ball 20 is installed on the fixing seat 18. A cylindrical hole penetrating the bottom is opened at the top of the universal ball 20, and the cylindrical hole is coaxially arranged with the universal ball 20. The hollow rotating shaft 21 is interference-fitted with the cylindrical hole. Positioning beads 22 are installed at both the upper and lower ends of the hollow shaft. The end of the forming inner tube 11 is rotatably connected to the positioning bead 22. It should be noted that the positioning part 16, the fixing seat 18, and the forming inner tube 11 match the shape of the forming hole 5.

[0043] The specific implementation process is as follows:

[0044] When using it, first determine the installation position of the molding mechanism, then connect the first connecting part 12 and the second connecting part 13. Apply release agent to the base 1, molding cylinder 2 and molding inner tube 11 to seal the remaining useless molding holes 5, and then pour the sample. After the sample solidifies, first remove the handle 17 from the fixed seat 18, then remove the positioning seat 14 from the molding cylinder 2, remove the ring 6 from the molding cylinder 2, then remove the molding cylinder 2 from the base 1, and finally pull the fixed seat 18 and molding inner tube 11 out of the sample to complete the preparation of the defective rock sample.

[0045] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An apparatus for preparing defective rock samples, characterized in that: It includes a base and a forming cylinder, which is detachably connected to the base. The forming cylinder has several forming holes and several forming mechanisms are detachably connected to the forming cylinder. Each forming mechanism includes a forming inner tube and two rotating connecting units. The forming inner tube includes a first connecting part and a second connecting part. The first connecting part and the second connecting part are slidably and detachably connected. The two ends of the forming inner tube are respectively rotatably and detachably connected to the two rotating connecting units. When creating interconnected hole defects in the same plane, take two molding mechanisms, first install one molding mechanism on the molding cylinder, then place the first connecting part of the other molding mechanism against the installed molding inner tube, and place the second connecting part of the other molding mechanism against the appropriate position on the installed molding inner tube, and then cast. In this way, interconnected hole defects in the same plane can be created.

2. The apparatus for preparing a defective rock sample according to claim 1, characterized in that: Each rotating connection unit includes a positioning seat, a fixed seat, and a handle. The handle passes through the positioning seat and is detachably connected to the fixed seat. A universal ball is installed on the fixed seat, and a hollow rotating shaft is fixedly connected to the universal ball. Positioning beads are fixedly connected to both ends of the hollow rotating shaft, and the molded inner tube is rotatably connected to the positioning beads.

3. The apparatus for preparing a defective rock sample according to claim 2, characterized in that: The positioning seat includes a limiting part and a positioning part connected in sequence. The positioning part matches the shape of the forming hole and can be locked inside the forming hole.

4. The apparatus for preparing a defective rock sample according to claim 3, characterized in that: The forming cylinder includes several arc-shaped connecting parts, and the forming cylinder is a cylindrical structure formed by several arc-shaped connecting parts.

5. The apparatus for preparing a defective rock sample according to claim 4, characterized in that: Each arc-shaped connector has a slot at both ends along its axial direction, and the slots on adjacent arc-shaped connectors face opposite directions.

6. The apparatus for preparing a defective rock sample according to claim 5, characterized in that: The molded cylinder is fitted with a ring.

7. The apparatus for preparing a defective rock sample according to claim 6, characterized in that: The shape of the forming hole is any combination of one or more of the following: circular, square, prismatic, and polygonal, and the forming mechanism is matched with the forming hole.

8. The apparatus for preparing a defective rock sample according to claim 7, characterized in that: A retaining ring is provided on the handle between the positioning seat and the fixed seat.

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