Rock deformation test device and rock confining pressure acquisition method

Abstract

The rock deformation test device comprises a rigid part, an elastic part, a pressure applying part, a stopping part and a measuring part, the rigid part has a first inner cavity extending along a first direction, the elastic part has a second inner cavity extending along the first direction, the second inner cavity is used for containing a rock, the elastic part is arranged in the first inner cavity, and the elastic part is in abutment with the rigid part, the pressure applying part is arranged on one side of the elastic part in the first direction, the pressure applying part is used for applying pressure to the rock, the stopping part is arranged on the other side of the elastic part in the first direction, and the stopping part is used for stopping the rock, and the measuring part is arranged on the elastic part and is used for obtaining the deformation amount of the elastic part. The rock deformation test device of the embodiment of the present application can obtain the deformation condition of the rock without arranging a pressure oil cavity, has a simple structure, and can be suitable for broken rocks.

Description

Technical Field

[0001] This invention relates to the field of confining pressure testing devices, and more specifically to a rock deformation testing device and a method for obtaining rock confining pressure. Background Technology

[0002] Confining pressure refers to the pressure exerted on a rock by the surrounding rock. It is an important indicator for understanding the deformation characteristics of fractured rocks, to further analyze the settlement of overburden or surface subsidence, and to provide experimental basis for overburden grouting for settlement reduction and goaf filling projects.

[0003] In related technologies, confining pressure calibrating devices are equipped with a pressure oil chamber surrounding the rock core. Confining pressure is applied to the rock core through this chamber, and the deformation of the core is measured by strain gauges within the core. However, the presence of this pressure oil chamber in these devices leads to a relatively complex structure. Furthermore, these devices are only suitable for monolithic rock cores and cannot be applied to fractured rocks. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of the present invention provide a rock deformation testing device that can obtain the deformation status of rocks without the need for a pressure oil chamber, has a simple structure, and is applicable to fractured rocks.

[0005] An embodiment of the invention also proposes a method for obtaining rock confining pressure.

[0006] The rock deformation testing apparatus of this invention includes:

[0007] A rigid member having a first internal cavity extending along a first direction;

[0008] An elastic element having a second inner cavity extending along the first direction, the second inner cavity being for accommodating a rock, the elastic element being disposed within the first inner cavity, and the elastic element abutting against the rigid element;

[0009] A pressure-applying member is disposed on one side of the elastic member in the first direction, and the pressure-applying member is used to apply pressure to the rock;

[0010] A stopper is provided on the other side of the elastic member in the first direction to stop the rock;

[0011] A measuring element is disposed on the elastic element to obtain the amount of deformation of the elastic element.

[0012] The rock deformation testing device of this invention can obtain the deformation state of rocks without the need for a pressure oil chamber. It has a simple structure and is applicable to fractured rocks. Furthermore, the state of the rock under pressure within the rock deformation testing device is closer to its state in a rock mass environment. Therefore, the results obtained by the rock deformation testing device are closer to the actual situation of the rock in a rock mass environment.

[0013] In some embodiments, the stop member is connected to the rigid member, and the stop member abuts against the end face of the elastic member in the first direction.

[0014] In some embodiments, the measuring element is embedded within the elastic element, and the rigid element has a through hole extending through the rigid element in a second direction, the through hole being used for passage of the elastic element and / or lines connecting the elastic element.

[0015] In some embodiments, the measuring element is disposed at one end of the elastic element connected to the stop element, and the through hole is disposed at one end of the rigid element connected to the stop element.

[0016] In some embodiments, the measuring element is a strain gauge, and there are multiple measuring elements arranged at intervals around the first direction.

[0017] In some embodiments, the rock deformation testing device further includes a hoop disposed within the second inner cavity, the hoop having a third inner cavity extending along the first direction for accommodating the rock, and the hoop being telescoping about the first direction.

[0018] In some embodiments, the hoop abuts against the elastic member, and the hoop has an opening extending through the hoop along the first direction.

[0019] In some embodiments, the hoop has a first end face and a second end face disposed opposite to each other in a first direction, the first end face abutting against the stop member, the second end face being located on the side of the elastic member away from the stop member, and the pressure member being able to extend into the third inner cavity.

[0020] The method for obtaining rock confining pressure according to embodiments of the present invention includes:

[0021] The rock is placed inside a rock deformation testing device, which is the rock deformation testing device described in any of the above embodiments;

[0022] The pressure-applying component applies pressure to the rock, and the measuring component acquires the inner diameter deformation of the elastic component;

[0023] The confining pressure σ on the rock is calculated according to the following formula (1). ρ :

[0024]

[0025] Where, ρ () The inner diameter of the elastic element is...

[0026] A and C are constants, and A and C are calculated according to the following formula (2):

[0027]

[0028] Among them, u ρ(a) The inner diameter deformation of the elastic element is given.

[0029] u ρ(b) The value is 0, representing the outer diameter deformation of the elastic element.

[0030] E is the elastic modulus of the material of the elastic element.

[0031] μ is the Poisson's ratio of the elastic element.

[0032] ρ () The outer diameter of the elastic element is given.

[0033] The rock confining pressure acquisition method of this invention is implemented using the rock deformation testing device of this invention. It is simple to operate and applicable to fractured rocks. Furthermore, since the state of the rock under pressure within the rock deformation testing device is closer to the state of the rock in a rock mass environment, the acquired confining pressure is closer to the actual situation of the rock in a rock mass environment.

[0034] In some embodiments, the rock is a fractured rock. After the fractured rock is placed in the rock deformation testing device, the rock deformation testing device is first vibrated using a vibration table, and then the pressure-applying component is driven to apply pressure to the rock. Attached Figure Description

[0035] Figure 1 This is a partial structural schematic diagram of the rock deformation testing device according to an embodiment of the present invention;

[0036] Figure 2 yes Figure 1 A frontal sectional view of a rock deformation test apparatus;

[0037] Figure 3 This is a front view of the pressure-applying component in an embodiment of the present invention.

[0038] Figure label:

[0039] 1. Rigid component; 11. Through hole; 2. Elastic component; 3. Pressure-applying component; 4. Stop component; 5. Hoop; 51. Opening. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] The following is for reference. Figures 1-3 This invention describes a rock deformation testing apparatus and a method for obtaining rock confining pressure according to embodiments of the invention.

[0042] like Figures 1-3 As shown, the rock deformation test device of this invention includes a rigid component 1, an elastic component 2, a pressure-applying component 3, a stop component 4, and a measuring component.

[0043] Rigid member 1 has a first direction (e.g.) Figure 1 The elastic member 2 has a first inner cavity extending in the vertical direction (as shown). The second inner cavity extends in the first direction and is used to accommodate the rock. The elastic member 2 is disposed within the first inner cavity and abuts against the rigid member 1. A pressure-applying member 3 is disposed on one side of the elastic member 2 in the first direction and is used to apply pressure to the rock. A stop member 4 is disposed on the other side of the elastic member 2 in the first direction to stop against the rock. A measuring member is disposed on the elastic member 2 to obtain the amount of deformation of the elastic member 2.

[0044] Specifically, such as Figures 1-3 As shown, rigid member 1 is a circular sleeve extending in the vertical direction, and has a first inner cavity extending through it in the vertical direction. Rigid member 1 is preferably made of steel. Elastic member 2 is a circular sleeve extending in the vertical direction, and has a second inner cavity extending through it in the vertical direction. The second inner cavity is used to accommodate rock. Elastic member 2 is disposed within the first inner cavity, and its outer peripheral surface abuts against the inner peripheral surface of rigid member 1. Elastic member 2 is preferably made of rubber.

[0045] The pressure-applying member 3 is disposed above the elastic member 2, and at least a portion of the pressure-applying member 3 is movable relative to the elastic member 2 in a vertical direction and can enter and exit the second inner cavity to apply downward pressure to the rock. Preferably, the pressure-applying member 3 is a pressure head disposed on a press, the diameter of the bottom of the pressure head being smaller than the diameter of the second inner cavity, so that the bottom of the pressure head can enter and exit the second inner cavity to apply pressure. The stop member 4 is disposed below the elastic member 2 to stop against the lower end of the rock.

[0046] When the pressure-applying component 3 applies downward pressure to the rock, the rock cannot move downwards due to the stop component 4. It can only deform and move in a direction orthogonal to the vertical direction, in other words, it deforms and moves in the horizontal direction. This applies pressure to the inner circumferential surface of the elastic component 2, causing the elastic component 2 to deform under pressure. A measuring component is installed on the elastic component 2 to obtain the amount of deformation of the elastic component 2, thereby analyzing the deformation of the rock and obtaining the deformation characteristics of the rock.

[0047] The rock deformation testing device of this invention can obtain the deformation state of rocks without the need for a pressure oil chamber. It has a simple structure and is applicable to fractured rocks, enabling simulation and analysis of the creep deformation of fractured rocks under triaxial pressure. Furthermore, the state of the rock under pressure within the device more closely approximates its state in a rock mass environment; therefore, the results obtained by the device are closer to the actual situation of the rock in a rock mass environment.

[0048] In some embodiments, the stop member 4 is connected to the rigid member 1, and the stop member 4 abuts against the end face of the elastic member 2 in a first direction.

[0049] like Figure 1 and Figure 2 The stop member 4 is a base, and the rigid member 1 is set on the stop member 4, preferably as an integral structure with the stop member 4. The top surface of the stop member 4 is a plane, and the lower end surface of the elastic member 2 abuts against the top surface of the stop member 4, so that the stop member 4 can simultaneously limit the rock and the elastic member 2, and prevent the elastic member 2 from moving under the pressure of the rock and affecting the data obtained by the measuring device.

[0050] It is understood that the stop is not limited to the base. In other embodiments, the stop is an independent component and the stop is fixed in position relative to the rigid component. The upper end of the stop extends into the second inner cavity to stop the rock.

[0051] It is understood that the top surface of the stop member is not limited to a plane. In other embodiments, the top surface of the stop member has a protrusion with the same diameter as the inner diameter of the elastic member when it is not compressed, and the protrusion extends into the second inner cavity to stop the rock.

[0052] In some embodiments, the measuring element is embedded in the elastic element 2, and the rigid element 1 has a through hole 11 extending through the rigid element 1 in a second direction, the through hole 11 being used for the passage of the elastic element 2 and / or the line connecting the elastic element 2.

[0053] like Figure 2 As shown, the rigid member 1 has a through hole 11 that penetrates the cylindrical wall of the rigid member 1 in a horizontal direction. The elastic member 2 can enter the first inner cavity through the through hole 11 and be embedded in the elastic member 2 to obtain the deformation amount of the elastic member 2. At the same time, the line connecting the elastic member 2 is located in the through hole 11 to transmit the data obtained by the elastic member 2.

[0054] In some embodiments, the measuring element is located at one end of the elastic element 2 connected to the stop element 4, and the through hole 11 is located at one end of the rigid element 1 connected to the stop element 4.

[0055] like Figure 2As shown, the stop member 4 is located at the bottom of the rigid member 1, and the bottom of the elastic member 2 abuts against the stop member 4. The measuring member is embedded in the bottom of the elastic member 2, and the through hole 11 is located at the bottom of the rigid member 1 so that the measuring member can obtain a more accurate amount of deformation.

[0056] It is understood that the measuring element is not limited to being located at the bottom of the elastic element; in other embodiments, the measuring element may also be located in the middle of the elastic element.

[0057] In some embodiments, the measuring element is a strain gauge, and there are multiple measuring elements arranged at intervals around a first direction.

[0058] Specifically, the measuring element is a strain gauge, and there are multiple measuring elements arranged at intervals around the elastic element in the vertical direction. In other words, multiple measuring elements are arranged at intervals along the circumference of the elastic element to obtain the deformation of the elastic element at different positions in the circumference. The average value of the data obtained from multiple measuring elements is used as the deformation of the elastic element, thereby improving the accuracy of the data.

[0059] In some embodiments, the rock deformation test device of the present invention further includes a hoop 5, which is disposed in a second inner cavity. The hoop 5 has a third inner cavity extending along a first direction for accommodating rock. The hoop 5 is telescopically movable about the first direction.

[0060] like Figure 1 and Figure 2 As shown, the hoop 5 is a cylindrical body extending in the vertical direction, and the hoop 5 can extend and retract in the vertical direction. The hoop 5 has a third inner cavity extending in the vertical direction, which is used to accommodate rocks. The hoop 5 is located inside the second inner cavity; in other words, the elastic element 2 surrounds the outer periphery of the hoop 5.

[0061] The bottom of the pressure-applying member 3 can move vertically relative to the hoop 5 to enter the third inner cavity and apply downward pressure to the rock. Under the restraining action of the stop member 4, the rock deforms and moves horizontally, thereby applying pressure to the hoop 5. The hoop 5 is compressed and extends vertically, applying pressure to the inner wall of the elastic member 2, causing the elastic member 2 to deform under pressure. Preferably, the hoop 5 is made of metal, more preferably iron.

[0062] In underground mining and geotechnical engineering, the impact of fractured rock accumulated in goaf areas on overlying strata directly affects strata movement and surface subsidence. The fractured rock in goaf areas is under triaxial stress, and its circumferential constraints are variable. In the rock deformation testing device of this invention, the hoop provides circumferential constraints to the fractured rock during use. Because the hoop can extend and retract in the vertical direction, the circumferential constraints provided by the hoop are variable, more closely approximating the actual compressive state of the fractured rock. Therefore, the rock deformation testing device of this invention can obtain more accurate test results.

[0063] In some embodiments, the hoop 5 abuts against the elastic member 2, and the hoop 5 has an opening 51 extending through the hoop 5 in a first direction.

[0064] like Figure 1 and Figure 2 As shown, the outer circumferential surface of the hoop 5 always abuts against the inner circumferential surface of the elastic member 2. In other words, the hoop 5 abuts against the inner circumferential surface of the elastic member 2 in both compressed and uncompressed states.

[0065] The hoop 5 has an opening 51 that extends through the hoop 5 in the vertical direction. Preferably, the hoop 5 is a cylinder formed by a plate in the vertical direction, and the hoop 5 is wrapped around the vertical direction less than once. An opening 51 is formed between one end of the hoop 5 in the circumferential direction. When the hoop 5 is subjected to the pressure of the rock, the opening 51 increases so that the hoop 5 extends in the vertical direction and applies pressure to the elastic member 2.

[0066] It is understood that the hoop is not limited to always abutting against the inner wall surface of the elastic element. In some embodiments, when the hoop is not under pressure, there is a gap between the outer peripheral surface of the hoop and the inner peripheral surface of the elastic element. When the hoop is under pressure, the outer peripheral surface of the hoop abuts against the inner peripheral surface of the elastic element.

[0067] Understandably, the structure of the hoop is not limited to that of... Figure 1 In some embodiments of the structure shown, the hoop wraps around more than one revolution in the vertical direction, and the hoops partially overlap.

[0068] In some embodiments, the hoop 5 has a first end face and a second end face disposed opposite to each other in a first direction, the first end face abutting against the stop member 4, the second end face being located on the side of the elastic member 2 away from the stop member 4, and the pressure member 3 being able to extend into the third inner cavity.

[0069] like Figure 2 As shown, the lower end face of the hoop 5 is the first end face, and the upper end face of the hoop 5 is the second end face. The lower end face of the hoop 5 abuts against the stop member 4 to limit the position of the hoop 5. The upper end face of the hoop 5 is higher than the upper end face of the elastic member 2 so that the pressure applied by the pressure applying member 3 can be fully applied to the rock. Preferably, the upper end face of the rock is lower than the upper end face of the hoop 5.

[0070] like Figures 1-3 As shown, the rock confining pressure acquisition method of this embodiment of the invention includes placing the rock inside a rock deformation testing device, which is the rock deformation testing device of this embodiment of the invention.

[0071] Specifically, the rock deformation test device is set up in the vertical direction, and the stop 4 is located at the bottom. The rock is placed in the third inner cavity from top to bottom.

[0072] The pressure-applying component 3 applies pressure to the rock, and the measuring component obtains the inner diameter deformation of the elastic component 2.

[0073] Specifically, the pressure-applying component 3 is driven to move its lower end downward and enter the third inner cavity to apply pressure to the rock in the third inner cavity. The rock deforms and moves in the horizontal direction under pressure, and the hoop 5 is deformed by the pressure of the rock, and the opening 51 increases so that the hoop 5 extends in the vertical direction and applies pressure to the elastic component 2. The measuring component obtains the amount of deformation of the inner diameter of the elastic component 2.

[0074] Preferably, the diameter of the bottom of the pressure head is the same as the inner diameter of the hoop when it is not compressed.

[0075] The confining pressure σ on the rock is calculated using the following formula (1). ρ :

[0076]

[0077] Where, ρ () The inner diameter of elastic element 2

[0078] A and C are constants, and A and C are calculated according to the following formula (2):

[0079]

[0080] Among them, u ρ(a) The inner diameter deformation of elastic element 2 is...

[0081] u ρ(b) This represents the outer diameter deformation of elastic element 2, and its value is 0.

[0082] E is the elastic modulus of the material of elastic component 2.

[0083] μ is the Poisson's ratio of elastic element 2.

[0084] ρ () The outer diameter of elastic element 2.

[0085] Specifically, since the outer circumferential surface of the elastic element 2 abuts against the inner circumferential surface of the rigid element 1, only the inner diameter of the elastic element 2 changes during deformation, while the outer diameter of the elastic element 2 remains unchanged. In other words, the deformation amount uρ of the outer diameter of the elastic element 2 is... b The value is 0. The inner diameter deformation u of elastic element 2 is... ρ (a) The inner diameter deformation u of the elastic element 2, preferably obtained from the measuring instrument. ρ (a) is the average value of data obtained from multiple measuring instruments.

[0086] The inner diameter deformation amount u of elastic element 2 ρ (a) Deformation amount u of the outer diameter of elastic element 2 ρ(b) The elastic modulus E of elastic element 2, the Poisson's ratio μ of elastic element 2, and the outer diameter ρ of elastic element 2. (b Substitute these values ​​into formula (2) to calculate the values ​​of A and C, where the outer diameter ρ of elastic element 2 is... (b) This is the original outer diameter of elastic element 2; in other words, the outer diameter ρ of elastic element 2. (b) The outer diameter of elastic element 2 when it is not under pressure.

[0087] After obtaining the values ​​of A and C, set A, C, and the inner diameter ρ of elastic element 2. (a) Substituting into formula (1), the confining pressure σ on the rock is calculated. ρ The confining pressure σ on the rock ρ It is a passive confining pressure. The inner diameter ρ of the elastic element 2 is... ( a) is the original inner diameter of elastic element 2, in other words, the inner diameter ρ of elastic element 2. (a) The inner diameter of elastic element 2 when it is not under pressure.

[0088] In some embodiments, the rock is a broken rock. After the broken rock is placed in the rock deformation test device, the rock deformation test device is first vibrated using a vibration table, and then the pressure applying element 3 is driven to apply pressure to the rock.

[0089] Specifically, the rock is preferably broken rock. The rock deformation test device is set on the vibration table in the vertical direction, and the stop 4 is located on the table surface. First, the broken rock is placed in the third inner cavity from top to bottom. Then, the vibration table is turned on to make the rock deformation test device vibrate so that the broken rock in the third inner cavity is uniform and compact. Then, the pressure applying member 3 is driven so that the lower end of the pressure applying member 3 moves downward and enters the third inner cavity to apply pressure to the broken rock in the third inner cavity. At the same time, the inner diameter deformation of the elastic member 2 is obtained by measuring the measuring member.

[0090] In the description of this invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", and "outer" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0091] Furthermore, the terms "first" and "second" are used only for distinction and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0092] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0093] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0094] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0095] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A rock deformation testing device, characterized in that, Suitable for broken rocks, including: A rigid member (1) having a first inner cavity extending in a first direction; An elastic element (2) has a second inner cavity extending along the first direction, the second inner cavity being used to accommodate a rock, the elastic element (2) being disposed in the first inner cavity, and the elastic element (2) abutting against the rigid element (1); A pressure-applying member (3) is disposed on one side of the elastic member (2) in the first direction, and the pressure-applying member (3) is used to apply pressure to the rock; A stopper (4) is provided on the other side of the elastic member (2) in the first direction. The stopper (4) is connected to the rigid member (1) on one side in the first direction. The stopper (4) abuts against the end face of the elastic member (2) in the first direction. The stopper (4) is used to stop the rock and the elastic member (2). A measuring element is disposed on the elastic element (2) for obtaining the deformation amount of the elastic element (2); The hoop (5) is located in the second inner cavity and abuts against the elastic member (2). The hoop (5) has a third inner cavity extending along the first direction. The third inner cavity is used to accommodate the rock. The pressure member (3) can extend into the third inner cavity to apply pressure to the rock. During use, the hoop (5) provides circumferential constraint on the broken rock. The hoop (5) can extend and retract around the first direction. The circumferential constraint provided by the hoop (5) on the broken rock is variable and closer to the actual pressure state of the broken rock. The deformation measured by the measuring instrument is used to calculate the confining pressure on the rock using formula (1). : （1） in, It is half the inner diameter of the elastic element (2). A and C are constants, and A and C are calculated according to the following formula (2): （2） in, The inner diameter deformation of the elastic element (2) is given. The outer diameter deformation of the elastic element (2) is 0, and its value is 0. The elastic modulus of the material of the elastic element (2) is The Poisson's ratio of the elastic element (2) is given by the given information. It is half the outer diameter of the elastic element (2).

2. The rock deformation testing apparatus according to claim 1, characterized in that, The measuring element is a strain gauge, and there are multiple measuring elements arranged at intervals around the first direction.

3. The rock deformation testing apparatus according to claim 2, characterized in that, The measuring element is embedded in the elastic element (2), and the rigid element (1) has a through hole (11) extending through the rigid element (1) in a second direction. The through hole (11) is used for the measuring element and / or the line connecting the elastic element (2) to pass through.

4. The rock deformation testing apparatus according to claim 3, characterized in that, The measuring element is located at one end of the elastic element (2) connected to the stop element (4), and the through hole (11) is located at one end of the rigid element (1) connected to the stop element (4).

5. The rock deformation testing apparatus according to claim 1, characterized in that, The hoop (5) has an opening (51) that extends through the hoop (5) along the first direction.

6. The rock deformation testing apparatus according to claim 1, characterized in that, The hoop (5) has a first end face and a second end face that are disposed opposite to each other in a first direction. The first end face abuts against the stop member (4), and the second end face is located on the side of the elastic member (2) away from the stop member (4).

7. A method for obtaining rock confining pressure, characterized in that, include: The rock is placed inside the rock deformation testing device, which is the rock deformation testing device according to any one of claims 1-6; The pressure-applying component (3) extends into the third inner cavity to apply pressure to the rock, and the measuring component obtains the inner diameter deformation of the elastic component (2); The confining pressure on the rock is calculated according to the following formula (1). : （1） in, It is half the inner diameter of the elastic element (2). A and C are constants, and A and C are calculated according to the following formula (2): （2） in, The inner diameter deformation of the elastic element (2) is given. The outer diameter deformation of the elastic element (2) is 0, and its value is 0. The elastic modulus of the material of the elastic element (2) is The Poisson's ratio of the elastic element (2) is given by the given information. It is half the outer diameter of the elastic element (2).

8. The method for obtaining rock confining pressure according to claim 7, characterized in that, The rock is a broken rock. After the broken rock is placed in the rock deformation test device, the rock deformation test device is first vibrated using a vibration table, and then the pressure-applying component (3) is driven to apply pressure to the rock.

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