A biaxial cross-shaped loading device for rock shear testing

Abstract

The invention discloses a cross-biaxial loading device for rock shear test, comprising two linear loading device monomers arranged up and down, each linear loading device monomer comprising a loading body and a driving mechanism, the loading body is an open box-shaped structure, and the driving mechanism drives the loading body to move linearly; the two loading bodies are arranged oppositely, the bottom surface of the loading body located at the bottom faces downward, and the bottom surface of the loading body located at the top faces upward, and the rock sample to be tested is placed in a cavity surrounded by the two loading bodies; the movement directions of the two loading bodies are perpendicular to each other. The loading in the X and Y directions of the cross-biaxial loading device of the invention is superimposed on the sample to form a force loading in any direction or a displacement loading in any path within the shear plane, so that the loading in the X and Y directions can be completely independent and superimposed on each other, eliminating the disadvantages of increased motion load and inertia caused by the superimposed structure of the mechanical device, improving dynamic performance, reducing driving power, and improving control accuracy.

Description

Technical Field

[0001] The invention belongs to the field of geotechnical detection in geotechnical engineering technology, and in particular relates to a cross biaxial loading device for rock shear test. Background Art

[0002] The dynamic shear test of rock mass structure surface is mainly based on direct shear test, supplemented by conventional triaxial test. The existing testing machines in China can realize the loading of any stress or displacement path, and adopt the mechanical device superposition structure (that is, the loading device in one direction is fixed on the moving body of the loading device in another direction), that is, a loading device in the X or Y direction is installed on the sliding body of another loading device to realize the superposition of movement in two directions, so that the movement in the X direction and the Y direction are not independent, and the movement load and inertia of the bottom sliding body are greatly increased. In the dynamic high-speed cyclic shear, this additional load and inertia have a great influence on the loading accuracy control, and increase the power drive power. Summary of the invention

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a cross-biaxial loading device for rock shear test, which can eliminate the disadvantages of increased motion load and inertia brought by the superimposed structure of the mechanical device, improve dynamic performance, reduce driving power, and improve control accuracy.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A cross biaxial loading device for rock shear test comprises two linear loading device monomers arranged up and down, each of the linear loading device monomers comprises a loading body and a driving mechanism, the loading body is an open box-shaped structure, and the driving mechanism drives the loading body to move linearly; the two loading bodies are arranged opposite to each other, the bottom surface of the loading body located at the bottom faces downward, and the bottom surface of the loading body located at the top faces upward, and the rock sample to be tested is placed in a cavity surrounded by the two loading bodies; the movement directions of the two loading bodies are perpendicular to each other.

[0006] Furthermore, the open surfaces of the two loading moving bodies are parallel to each other.

[0007] Furthermore, the movement direction of the loading body is parallel to the open surface of the loading body.

[0008] Furthermore, each linear loading device unit is provided with two driving mechanisms, which are respectively arranged on both sides of the loading body to drive the loading body to move in opposite directions.

[0009] Furthermore, each linear loading device unit also includes two loading reverse brackets, which are parallel to each other and perpendicular to the movement direction of the loading body and are arranged on both sides of the loading body. The loading reverse brackets provide a reaction force when the driving mechanism drives the loading body to move.

[0010] Furthermore, the fixed end of the driving mechanism is mounted on the loading reverse bracket, and the movable end is connected to the loading moving body.

[0011] Furthermore, each of the linear loading device units also includes a base, which is arranged on one side of the bottom surface of the loading body and is parallel to the bottom surface of the loading body; a linear slide rail is provided on the base along the movement direction of the loading body, and a slider matching the linear slide rail is provided on the bottom surface of the loading body, and the loading body moves linearly on the base.

[0012] Furthermore, at least one of the linear loading device units can move up and down in a direction perpendicular to the bottom surface of the loading body.

[0013] Furthermore, the loading body is a cuboid.

[0014] Furthermore, the bottom surface of the loading dynamic body is a square.

[0015] The beneficial effects of the present invention are as follows: the cross biaxial loading device of the present invention comprises two linear loading device monomers installed with a cross inverted structure, the two loading dynamic bodies act on the upper and lower parts of the rock sample to be tested respectively, and the loading in the X and Y directions is superimposed on the sample to form a force loading in any direction or a displacement loading in any path within the shear plane, thereby achieving that the loading in the X and Y directions can be completely independent and superimposed on each other, eliminating the disadvantages of increased motion load and inertia caused by the superimposed structure of the mechanical device, improving dynamic performance, reducing driving power, and improving control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the monomer structure of the linear loading device of the present invention;

[0017] Figure 2 It is a top view of a single body of the linear loading device of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the cross biaxial loading device of the present invention;

[0019] Figure 4 is a top view of the cross biaxial loading device of the present invention;

[0020] Figure 5 It is a structural schematic diagram of one embodiment of the cross biaxial loading device of the present invention applied to rock shear test;

[0021] Among them: 1. driving mechanism; 2. loading reverse bracket; 3. base; 4. loading dynamic body; 5. column; 6. upper shearing platform; 7. lower shearing platform; 8. guiding mechanism; 9. axial actuator; 10. axial force sensor. DETAILED DESCRIPTION

[0022] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. The present invention can be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and the concept of the present invention will be fully conveyed to those skilled in the art, and the present invention will only be limited by the claims.

[0023] like Figure 1-4 As shown, a cross-biaxial loading device for rock shear test includes two linear loading device monomers arranged up and down. The two linear loading device monomers adopt a cross-biaxial inverted structure. Each linear loading device monomer includes a loading dynamic body 4 and a driving mechanism 1.

[0024] The loading body 4 is an open box-shaped structure, having a bottom surface, four side surfaces, an open surface, and a cavity for accommodating the rock sample to be tested. Preferably, the loading body 4 is a rectangular parallelepiped structure, and more preferably, its bottom surface is a square.

[0025] Furthermore, the open surfaces of the two loading movable bodies 4 are parallel to each other, and the open surfaces are shear surfaces.

[0026] The driving mechanism 1 drives the loading body 4 to move linearly. The two loading bodies 4 are arranged opposite to each other, with the bottom surface of the loading body 4 located at the bottom facing downward and the bottom surface of the loading body 4 located at the top facing upward. The rock sample to be tested is placed in the cavity surrounded by the two loading bodies 4.

[0027] The movement directions of the two loading bodies 4 are perpendicular to each other. For the convenience of description, the movement directions of the loading bodies 4 of the two linear loading devices are defined as X and Y directions, respectively, and the X and Y directions are perpendicular to each other. The loading bodies 4 of the two linear loading devices act on the upper and lower parts of the rock sample to be tested, respectively, and the X-direction and Y-direction loading are superimposed on the rock sample to be tested to form a force loading in any direction or a displacement loading in any path within the shear plane.

[0028] Furthermore, the movement direction (X direction and Y direction) of the loading body 4 is parallel to the open surface of the loading body 4 .

[0029] Furthermore, each linear loading device is provided with two driving mechanisms 1, which are respectively provided on both sides of the loading body 4 to drive the loading body 4 to move in opposite directions. The driving mechanism 1 is preferably an oil cylinder or an air cylinder, which is provided with a pressure sensor and a displacement sensor.

[0030] Furthermore, each linear loading device monomer further includes two reverse loading brackets 2, which are parallel to each other and perpendicular to the movement direction of the loading body 4 and are arranged on both sides of the loading body 4, and provide a reaction force when the driving mechanism 1 drives the loading body 4 to move. At the same time, the reverse loading bracket 2 plays a role in fixing the driving mechanism 1. The fixed end of the driving mechanism 1 is installed on the reverse loading bracket 2, and the movable end is connected to the loading body 4.

[0031] Furthermore, each linear loading device monomer further includes a base 3, which is arranged on one side of the bottom surface of the loading body 4 and is parallel to the bottom surface of the loading body 4. A linear slide is provided on the base 3 along the movement direction of the loading body 4, and a slider matching the linear slide is provided on the bottom surface of the loading body 4, and the loading body 4 moves linearly on the base 3. The slide rail and slider matching structure between the loading body 4 and the base 3 plays a guiding role, so that the loading body 4 moves linearly on the base 3, and at the same time reduces the friction force on the loading body 4 when the cross loading device as a whole is subjected to a downward force for a shear test.

[0032] Furthermore, at least one linear loading device monomer can move up and down in a direction perpendicular to the bottom surface of the loading dynamic body 4. The normal direction of the shear surface of the loading dynamic body 4 is defined as the Z direction, and at least one linear loading device monomer can move in the Z-axis direction, and the linear loading device monomer has no relative movement in the Z-direction projection plane. When performing a rock shear test, two linear loading device monomers are close to each other, and the rock sample to be tested is placed in a cavity surrounded by the two loading dynamic bodies 4. The driving mechanism 1 drives the loading dynamic body 4 to move along the X direction and the Y direction to shear the rock sample to be tested.

[0033] The cross biaxial loading device of the present invention can be applied to rock shear test. As one embodiment, Figure 5 As shown, the linear loading device monomer located at the bottom is fixedly set on the lower shearing platform 7, and the linear loading device monomer located at the top is movably set on the upper shearing platform 6, and the two linear loading device monomers are cross-shaped and inverted. The upper shearing platform 6 and the lower shearing platform 7 are connected by a column 5, and an axial actuator 9 is provided on the linear loading device monomer located at the top. Under the drive of the axial actuator 9, it can move up and down on the column 5, approaching or moving away from the linear loading device monomer located at the bottom. An axial force sensor 10 is provided on the axial actuator 9. A guide mechanism 8 is provided at the connection between the upper shearing platform 6 and the linear loading device monomer located at the top to guide the linear loading device monomer located at the top to move along a straight line on the column 5.

[0034] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A cross biaxial loading device for rock shear test, characterized in that: The invention comprises two linear loading device monomers arranged vertically, each of the linear loading device monomers comprising a loading body (4) and a driving mechanism (1), the loading body (4) being an open box-shaped structure, and the driving mechanism (1) driving the loading body (4) to move linearly; the two loading bodies (4) are arranged opposite to each other, the bottom surface of the loading body (4) located at the bottom faces downward, and the bottom surface of the loading body (4) located at the top faces upward, and the rock sample to be tested is placed in a cavity surrounded by the two loading bodies (4); the movement directions of the two loading bodies (4) are perpendicular to each other; Each linear loading device unit further comprises two reverse loading brackets (2), wherein the reverse loading brackets (2) are arranged on both sides of the loading moving body (4) in parallel with each other and perpendicular to the movement direction of the loading moving body (4), and the reverse loading brackets (2) provide a reaction force when the driving mechanism (1) drives the loading moving body (4) to move; Each linear loading device unit also includes a base (3), which is arranged on one side of the bottom surface of the loading body (4) and is parallel to the bottom surface of the loading body (4); a linear slide rail is provided on the base (3) along the movement direction of the loading body (4), and a slider matching the linear slide rail is provided on the bottom surface of the loading body (4); the loading body (4) moves linearly on the base (3).

2. A cross biaxial loading device for rock shear test according to claim 1, characterized in that: The open surfaces of the two loading moving bodies (4) are parallel to each other.

3. The cross biaxial loading device for rock shear test according to claim 1, characterized in that: The movement direction of the loading dynamic body (4) is parallel to the open surface of the loading dynamic body (4).

4. The cross biaxial loading device for rock shear test according to claim 1, characterized in that: Each linear loading device unit is provided with two driving mechanisms (1), which are respectively arranged on both sides of the loading moving body (4) to drive the loading moving body (4) to move in opposite directions.

5. The cross biaxial loading device for rock shear test according to claim 1, characterized in that: The fixed end of the driving mechanism (1) is mounted on the loading reverse bracket (2), and the movable end is connected to the loading dynamic body (4).

6. The cross biaxial loading device for rock shear test according to claim 1, characterized in that: At least one of the linear loading device units can move up and down in a direction perpendicular to the bottom surface of the loading moving body (4).

7. The cross biaxial loading device for rock shear test according to claim 1, characterized in that: The loading dynamic body (4) is a rectangular parallelepiped.

8. A cross biaxial loading device for rock shear test according to claim 7, characterized in that: The bottom surface of the loading moving body (4) is a square.

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