CN214749418U - Rock triaxial creep test device and system thereof - Google Patents
Rock triaxial creep test device and system thereof Download PDFInfo
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- CN214749418U CN214749418U CN202120922174.9U CN202120922174U CN214749418U CN 214749418 U CN214749418 U CN 214749418U CN 202120922174 U CN202120922174 U CN 202120922174U CN 214749418 U CN214749418 U CN 214749418U
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Abstract
The utility model discloses a rock triaxial creep test device belongs to test equipment technical field. Rock triaxial creep test device includes: the creep deformation shell, the positive pressure component and the confining pressure component; the creep deformation shell comprises a top frame and a base for bearing a test piece; the confining pressure assembly comprises a bottom ring arranged on the base and a confining pressure side plate arranged between the bottom ring and the top frame, and a confining pressure cavity is formed among the bottom ring, the confining pressure side plate, the top frame and the base; an oil way hole communicated with the confining pressure cavity is formed in the base, and a connector is connected outside the oil way hole; the positive pressure assembly is disposed above the test piece and applies a positive pressure load to the test piece. The utility model discloses a cooperation between each subassembly is convenient to apply load to the test piece and is carried out the creep experiment to can remove the creep casing at the creep in-process and carry out industry CT scanning, thereby solve the current problem of rock creep test device awkward.
Description
Technical Field
The utility model relates to a test equipment technical field, concretely relates to rock triaxial creep test device.
Background
With the rapid development of underground engineering, the aging deformation of the surrounding rock of the chamber becomes a research hotspot in the field of underground engineering. Rock creep is the main content of rock age deformation, and the research of the age rupture characteristic in the rock creep process can provide a foundation for the age deformation of underground engineering rock masses.
At present, the rock creep mainly adopts a single-shaft and three-shaft creep test method, and an MTS pressure servo tester is mostly adopted in the test. The change characteristics of indexes such as stress, strain and the like of the rock sample can be well obtained through the MTS testing machine. However, creep experiments can take months or years, especially when a full creep regime is used, because they take longer. The process of other routine experiments requiring an MTS pressure servo tester is greatly influenced by the rock creep experiment using the MTS pressure servo tester. In addition, the MTS testing machine is expensive, difficult to popularize, large in size and difficult to carry, and causes much inconvenience in scientific research and engineering. Therefore, the rock creep test device in the prior art has the problem of inconvenient use.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a rock triaxial creep test device to solve the current rock creep test device awkward problem.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
rock triaxial creep test device includes: the creep deformation shell, the positive pressure component and the confining pressure component;
the creep deformation shell comprises a top frame and a base which is used for bearing a test piece and is connected with the top frame;
the confining pressure assembly comprises a bottom ring arranged on the base and positioned outside the test piece, a confining pressure upper cover arranged below the top frame and a confining pressure side plate arranged between the bottom ring and the confining pressure upper cover, and a confining pressure cavity is formed among the bottom ring, the confining pressure upper cover, the confining pressure side plate and the base;
an oil way hole communicated with the confining pressure cavity is formed in the base, and a connector is connected outside the oil way hole;
the positive pressure assembly is disposed above the test piece and may apply a positive pressure load to the test piece.
The utility model discloses can place the rock test piece on the base, be provided with the malleation subassembly that can exert the malleation load above the test piece, the confined pressure curb plate sets up between bottom ring and confined pressure upper cover, makes the inboard of confined pressure curb plate form airtight confined pressure cavity, and the oil circuit hole passes through connector external oil pipe to the confined pressure cavity oil charge to exert the confined pressure load to the test piece; the overall device is low in cost, convenient to carry and convenient for overall movement of the creep shell, so that the problem that the existing rock creep test device is inconvenient to use is solved.
Furthermore, the positive pressure assembly comprises a pressure head, a stepping motor, a reduction gearbox and a ball screw, wherein the pressure head penetrates through the upper enclosing cover and contacts with the top surface of the test piece, the stepping motor and the reduction gearbox are respectively arranged above the top frame, and the ball screw is arranged between the reduction gearbox and the pressure head and penetrates through the top frame.
The utility model discloses a step motor and reducing gear box cooperation are changed rotary motion into linear motion through ball, have ball to push away the pressure head and extrude the top surface of test piece to positive pressure load is applyed to the test piece.
Further, the position of the base in contact with the test piece is provided with a first pressure sensor, the inner wall face, far away from the test piece, of the confining pressure cavity is provided with a second pressure sensor, the top frame is provided with a first displacement sensor, the confining pressure upper cover is provided with a second displacement sensor, the oil way hole is connected with a flowmeter, and the confining pressure upper cover and the base are respectively provided with a threading hole.
The utility model discloses a first pressure sensor is used for detecting the malleation load that the test piece received, and second pressure sensor is used for detecting the oil pressure in the confined pressure cavity, and first displacement sensor and second displacement sensor are used for detecting the position change of ball and pressure head respectively, and the flowmeter is used for detecting the oil pressure and adds the real-time flow of notes, and the through wires hole is used for placing the interconnecting link of each inductor.
Furthermore, the top frame is connected with the base through a pull rod, and a limiting block in contact with the top surface of the top frame is arranged on the pull rod.
The utility model discloses a roof-rack and base fixed connection to top surface at the roof-rack is equipped with the stopper, is used for carrying on spacingly to the roof-rack, avoids the position of roof-rack to change under the effect of confined pressure load.
Furthermore, the confining pressure upper cover is provided with an exhaust hole communicated with the confining pressure cavity, and an exhaust valve is externally connected to the exhaust hole.
The utility model discloses an exhaust hole is arranged in discharging the gas in the confined pressure cavity to when the exhaust hole oil yield is stable, then prove the gaseous whole discharges in the confined pressure cavity, the exhaust valve is used for controlling the break-make in exhaust hole.
Furthermore, a sealing sleeve is arranged at the position where the surrounding upper cover is connected with the pressure head, and the pressure head is in sliding fit with the sealing sleeve.
The utility model discloses run through the position that encloses the upper cover at the pressure head and set up sealed sleeve, avoid pressure head and roof-rack direct contact, can also conveniently change after sealed sleeve wearing and tearing.
Furthermore, one end of the ball screw, which is contacted with the pressure head, is spherical.
The utility model discloses ball's tip is the frictional force between the rotatory time of spherical reducible ball and the pressure head to the axial that makes the pressure head feeds more accurately.
Furthermore, one end of the pressure head, which is contacted with the ball screw, is connected with the top frame through a spring.
The utility model discloses a pressure head passes through the spring to be connected with the roof-rack, and when unloading the load, ball upward movement, the pressure head then can be in the pulling force effect of spring the rebound reset.
Rock triaxial creep test system comprising: the device comprises a rock triaxial creep test device, a display, an oil supply pump, an industrial CT scanning device and a control chip, wherein the rock triaxial creep test device is positioned on the inner side of the industrial CT scanning device, the display and the oil supply pump are respectively positioned on the outer side of the industrial CT scanning device, the oil supply pump is communicated with an oil way hole through an oil pipe, and the control chip is respectively in communication connection with the display, the oil supply pump, the industrial CT scanning device and a stepping motor.
The rock triaxial creep test device of the utility model can be integrally placed in an industrial CT scanning device, so that a test piece can be scanned under the condition of not unloading a load, and rock creep data which is most close to the real condition can be obtained; the control chip is used for writing in the procedure, receiving and sending the signal of telecommunication to signal of telecommunication conversion of each subassembly is the digital signal and is shown on the display, thereby makes things convenient for the experimenter to carry out accurate control through the display to step motor and fuel feed pump, thereby obtains complete test data.
Furthermore, the top frame, the base, the confining pressure upper cover and the confining pressure side plates are all made of organic glass materials.
The utility model discloses an organic glass possesses the better characteristics of CT ray trafficability characteristic, avoids causing too much the shielding that blocks to the CT ray to guarantee to acquire more accurate test data through industry CT scanning under the condition of not taking out the test piece.
The utility model discloses following beneficial effect has:
(1) the utility model discloses can place the rock test piece on the base, be provided with the malleation subassembly that can exert the malleation load above the test piece, the confined pressure curb plate sets up between bottom ring and confined pressure upper cover, makes the inboard of confined pressure curb plate form airtight confined pressure cavity, and the oil circuit hole passes through connector external oil pipe to the confined pressure cavity oil charge to exert the confined pressure load to the test piece; the overall device is low in cost, convenient to carry and convenient for overall movement of the creep shell, so that the problem that the existing rock creep test device is inconvenient to use is solved.
(2) The rock triaxial creep test device of the utility model can be integrally placed in an industrial CT scanning device, so that a test piece can be scanned under the condition of not unloading a load, and rock creep data which is most close to the real condition can be obtained; the control chip is used for writing in the procedure, receiving and sending the signal of telecommunication to signal of telecommunication conversion of each subassembly is the digital signal and is shown on the display, thereby makes things convenient for the experimenter to carry out accurate control through the display to step motor and fuel feed pump, thereby obtains complete test data.
Drawings
FIG. 1 is a schematic structural diagram of a triaxial creep test device for rock according to the present invention;
fig. 2 is the utility model discloses rock triaxial creep test system's structural schematic diagram.
In the figure: 10-creep case; 11-a top frame; 12-a base; 13-oil passage holes; 14-a connector; 15-threading holes; 16-air vent; 17-an exhaust valve; 18-a tie rod; 19-a limiting block; 20-confining pressure component; 21-bottom ring; 22-confining pressure upper cover; 23-confining pressure side plates; 24-confining pressure cavity; 30-a positive pressure assembly; 31-pressure head; 32-a stepper motor; 33-a reduction gearbox; 34-a ball screw; 35-sealing the sleeve; 36-a spring; 37-a boss; 40-test piece; 41-rubber membrane; 50-a display; 51-an oil supply pump; 52-industrial CT scanning device; 53-tubing; 61-a first pressure sensor; 62-a second pressure sensor; 63-a first displacement sensor; 64-a second displacement sensor; and 65-a flow meter.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
Examples
Referring to fig. 1, a triaxial creep test apparatus for rock, comprising: creep housing 10, confining pressure assembly 20, and positive pressure assembly 30.
The creep housing 10 includes a top frame 11 and a bottom frame 12 connected to each other, and the bottom frame 12 is centrally convex and flat for placing the test piece 40. The overall size of the creep housing 10 is small, does not occupy space, and facilitates hand handling by a tester. The diameter of the base 12 is about 260mm, the height of the creep deformation shell 10 is about 500mm, the whole creep deformation shell can be put into the existing general industrial CT scanning device 52 for scanning, and the creep deformation shell can be taken out after the scanning is finished. The top frame 11 is connected with the base 12 through the pull rod 18, the pull rod 18 is provided with a limiting block 19 which is in contact with the top surface of the top frame 11, and the limiting block 19 is used for limiting the top frame 11 and preventing the top frame from moving upwards after receiving oil pressure impact force inside the creep deformation shell 10.
The confining pressure assembly 20 comprises a bottom ring 21 arranged on the base 12 and positioned outside the test piece 40, a confining pressure upper cover 22 arranged below the top frame 11, and a confining pressure side plate 23 arranged between the bottom ring 21 and the confining pressure upper cover 22. And sealing rings are arranged between the bottom ring 21 and the base 12, between the confining pressure measuring plate 23 and the bottom ring 21, and between the confining pressure side plate 23 and the confining pressure upper cover 22, so that sealing connection is ensured. A confining pressure cavity 24 is formed among the bottom ring 21, the confining pressure side plate 23, the confining pressure upper cover 22 and the base 12, and the confining pressure cavity 24 is a closed space. An oil path hole 13 communicated with the confining pressure cavity 24 is formed in the base 12, the oil path hole 13 is further externally connected with a connector 14, and an external oil supply device through the connector 14 charges oil into the confining pressure cavity 24, so that confining pressure load is applied to the test piece 40.
The positive pressure assembly 30 includes, from top to bottom: the stepping motor 32, the reduction box 33, the ball screw 34 and the pressure head 31, the stepping motor 32 and the reduction box 33 are arranged above the top frame 11, the ball screw 34 penetrates through the top frame 11, and two ends of the ball screw 34 are respectively contacted with the reduction box 33 and the pressure head 31. The pressure head 31 runs through the confining pressure upper cover 22, a sealing sleeve 35 is arranged at the position contacting with the confining pressure upper cover 22, the pressure head 31 is in sliding fit with the sealing sleeve 35, abrasion of the confining pressure upper cover 22 caused by direct sliding of the pressure head 31 and the confining pressure upper cover 22 is avoided, and the sealing sleeve 35 is more convenient to replace after abrasion. A sealing ring is arranged between the sealing sleeve 35 and the confining pressure upper cover 22 so as to ensure the sealing connection between the two.
After the stepping motor 32 is started, the speed is reduced through the reduction box 33, the ball screw 34 converts the rotary motion into the linear motion, the ball screw 34 extrudes the pressure head 31, the pressure head 31 moves towards the test piece 40, and the positive pressure load is applied to the test piece 40. The ball screw 34 is spherical at the end contacting the ram 31, which reduces the friction between the ball screw 34 and the ram 31 during rotation, thereby making the axial feed of the ram 31 more accurate. The end of the pressure head 31 contacting the ball screw 34 is also connected with the top frame 11 through a spring 36, when the load is unloaded, the ball screw 34 moves upwards, and the pressure head 31 can move upwards to reset under the tension of the spring 36. The end of the pressure head 31 contacting the test piece 40 is provided with a boss 37, and the boss 37 can increase the surface area of the pressure head 31 contacting the test piece 40 and can prevent the pressure head 31 from passing through the sealing sleeve 35 when moving upwards.
A first pressure sensor 61 is arranged at the position where the base 12 is in contact with the test piece 40 and is used for detecting the positive pressure load applied to the test piece 40; a second pressure sensor 62 is arranged on the inner wall surface of the confining pressure cavity 24 far away from the test piece 40 and used for detecting the internal oil pressure of the confining pressure cavity 24; a first displacement sensor 63 is arranged at a position, close to the ball screw 34, on the bottom surface of the top frame 11, and is used for detecting the position change of the ball screw 34; a second displacement sensor 64 is arranged at the position, close to the pressure head 31, of the bottom surface of the enclosing upper cover 22 and is used for detecting the position change of the pressure head 31; the oil passage hole 13 is connected with a flow meter 65 for detecting the real-time flow rate of oil pressure filling.
The enclosing upper cover 22 and the base 12 are respectively provided with a threading hole 15, and the threading hole 15 is used for placing a connecting circuit of each sensor. The top frame 11 is provided with an exhaust hole 16 communicated with the confining pressure cavity 24, the exhaust hole 16 is externally connected with an exhaust valve 17, the exhaust hole 16 is used for exhausting gas in the confining pressure cavity 24, when oil in the exhaust hole 16 is stable, the exhaust hole proves that all gas in the confining pressure cavity 24 is exhausted, and the exhaust valve 17 is used for controlling the on-off of the exhaust hole 16.
The outer side of the test piece 40 is also provided with a layer of rubber film 41, the rubber film 41 can wrap the periphery of the test piece 40, and the test piece is not damaged when bearing the confining pressure load and the positive pressure load. The rubber membrane can protect the test piece 40, and hydraulic oil can permeate into the test piece 40 when the test piece 40 cracks, so that the accuracy of the test is influenced.
Referring to fig. 2, a rock triaxial creep test system comprising: the three-axis creep testing device for the rock comprises a three-axis creep testing device for the rock, a display 50, an oil supply pump 51, an industrial CT scanning device 52 and a control chip, wherein the three-axis creep testing device for the rock is located on the inner side of the industrial CT scanning device 52, and the display 50 and the oil supply pump 51 are respectively located on the outer side of the industrial CT scanning device 52. The oil supply pump 51 is communicated with the oil passage hole 13 through an oil pipe 53, thereby facilitating the filling of the inside of the confining pressure chamber 24 with hydraulic oil. In other embodiments of the present invention, the water filling to the inside of the confining pressure cavity 24 can be performed for the test, so that the test piece 40 can be observed in real time according to the high transparency of the water.
The control chip is respectively in communication connection with the display 50, the oil supply pump 51, the industrial CT scanning device 52 and the stepping motor 32, is a single chip microcomputer of STM32-F407ZGT6 model and is used for writing in a control program written by equipment manufacturers and receiving and sending signals through communication connection with all components, so that intelligent control over all the components is realized. Control chip can be with step motor 32 and fuel feed pump 51's signal conversion for digital signal show on display 50 to make things convenient for the experimenter to carry out accurate control through display 50 to step motor 32 and fuel feed pump 51, thereby obtain the experimental strain data of accomplishing.
The control chip is further in communication connection with the first pressure sensor 61, the second pressure sensor 62, the first displacement sensor 63, the second displacement sensor 64, and the flow meter 65, respectively, and calculates the acquired detection data through an internal program of the control chip, so as to obtain required test data, such as the volume deformation of the test piece 40. The control chip converts the electrical signals into digital signals to display the instantaneous values detected by the sensors on the display 50.
Roof-rack 11, base 12, confined pressure upper cover 22 and confined pressure curb plate 23 are the organic glass material, possess the better characteristics of CT ray trafficability characteristic according to organic glass to avoid causing too much blocking shielding to the CT ray, guarantee to obtain more accurate test data through industry CT scanning device 52 under the condition of not taking out test piece 40. In other embodiments of the present invention, the top frame 11, the base 12, the confining pressure upper cover 22 and the confining pressure side plate 23 may also be made of materials such as tempered glass and high strength carbon fiber.
The utility model discloses an operation process: (1) installing a test piece 40 with a proper size and shape, and installing a confining pressure side plate 23 on the bottom ring 21 to form a sealed confining pressure cavity 24; (2) the oil supply pump 51 is operated and controlled by the display 50 to fill oil into the confining pressure cavity 24; (3) after the exhaust holes 16 uniformly discharge oil, stopping filling oil and closing the exhaust valve 17 to finish oil filling; (4) the stepping motor 32 is controlled through the operation of the display 50, and the pressure head 31 is just contacted with the test piece 40 according to the feedback of the first pressure sensor 61; (5) resetting all the sensors, and putting the creep deformation shell 10 into industrial CT equipment for scanning to obtain the rock crack damage state when the creep deformation shell is not loaded; (6) the positive pressure component 30 is controlled by the display 50 to apply positive pressure load to the test piece 40 and record the collected data of each sensor; (7) performing industrial CT scanning on the creep shell 10 again after a proper time and acquiring experimental data; (8) after the creep is finished, the display 50 controls the stepping motor 32 to reset and controls the oil supply pump 51 to return oil; (9) the confining pressure side plate 23 is disassembled, and the test piece 40 is taken out.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. Rock triaxial creep test device which characterized in that includes: a creep housing (10), a confining pressure assembly (20) and a positive pressure assembly (30);
the creep shell (10) comprises a top frame (11) and a base (12) which is used for bearing a test piece (40) and is connected with the top frame (11);
the confining pressure assembly (20) comprises a bottom ring (21) arranged on the base (12) and positioned outside the test piece (40), a confining pressure upper cover (22) arranged below the top frame (11) and a confining pressure side plate (23) arranged between the bottom ring (21) and the confining pressure upper cover (22), and a confining pressure cavity (24) is formed among the bottom ring (21), the confining pressure upper cover (22), the confining pressure side plate (23) and the base (12);
an oil path hole (13) communicated with the confining pressure cavity (24) is formed in the base (12), and a connector (14) is externally connected with the oil path hole (13);
the positive pressure assembly (30) is disposed above the test piece (40) and may apply a positive pressure load to the test piece (40).
2. The triaxial creep test apparatus for rock according to claim 1, wherein the positive pressure assembly (30) comprises a pressure head (31) penetrating through the surrounding pressure cover (22) and contacting with the top surface of the test piece (40), a stepping motor (32) and a reduction gearbox (33) respectively arranged above the top frame (11), and a ball screw (34) arranged between the reduction gearbox (33) and the pressure head (31) and penetrating through the top frame (11).
3. The triaxial creep test device for rock according to claim 2, wherein a first pressure sensor (61) is arranged at a position where the base (12) contacts the test piece (40), a second pressure sensor (62) is arranged on an inner wall surface of the confining pressure cavity (24) far away from the test piece (40), a first displacement sensor (63) is arranged on the top frame (11), a second displacement sensor (64) is arranged on the confining pressure cover (22), the oil passage hole (13) is connected with a flow meter (65), and the confining pressure cover (22) and the base (12) are respectively provided with a threading hole (15).
4. The triaxial creep testing apparatus for rock according to claim 2, wherein the top frame (11) and the base (12) are connected by a pull rod (18), and a limit block (19) contacting with the top surface of the top frame (11) is arranged on the pull rod (18).
5. The triaxial creep test device for rock according to claim 4, wherein the confining pressure upper cover (22) is provided with an exhaust hole (16) communicated with the confining pressure cavity (24), and the exhaust hole (16) is externally connected with an exhaust valve (17).
6. The triaxial rock creep test apparatus as claimed in claim 5, wherein a sealing sleeve (35) is provided at a position where the confining upper cover (22) is connected with the pressure head (31), and the pressure head (31) is in sliding fit with the sealing sleeve (35).
7. The triaxial rock creep test apparatus of claim 6, wherein the end of the ball screw (34) in contact with the ram (31) is spherical.
8. The triaxial rock creep test apparatus as claimed in claim 7, wherein the end of the ram (31) in contact with the ball screw (34) is connected to the head frame (11) by a spring (36).
9. Triaxial creep test system of rock, characterized in that, includes triaxial creep device of rock, display (50), fuel feed pump (51), industry CT scanning device (52) and control chip of any one of claims 1 to 8, triaxial creep device of rock is located the inboard of industry CT scanning device (52), display (50) and fuel feed pump (51) are located respectively the outside of industry CT scanning device (52), fuel feed pump (51) pass through oil pipe (53) with oil circuit hole (13) intercommunication, control chip respectively with display (50), fuel feed pump (51), industry CT scanning device (52) and step motor (32) communication connection.
10. The rock triaxial creep test system of claim 9, wherein the top frame (11), the base (12), the confining pressure upper cover (22) and the confining pressure side plate (23) are all of organic glass material.
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| CN202120922174.9U CN214749418U (en) | 2021-04-29 | 2021-04-29 | Rock triaxial creep test device and system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113063665A (en) * | 2021-04-29 | 2021-07-02 | 四川大学 | Rock triaxial creep test device and system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063665A (en) * | 2021-04-29 | 2021-07-02 | 四川大学 | Rock triaxial creep test device and system thereof |
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