CN112284920A - Rock high-temperature compression test device and test method - Google Patents
Rock high-temperature compression test device and test method Download PDFInfo
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- CN112284920A CN112284920A CN202011133278.8A CN202011133278A CN112284920A CN 112284920 A CN112284920 A CN 112284920A CN 202011133278 A CN202011133278 A CN 202011133278A CN 112284920 A CN112284920 A CN 112284920A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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Abstract
The invention provides a rock high-temperature compression test device and a test method, which comprise the following steps: the testing machine comprises a testing machine main body, an object carrying box and an upper pressing block, wherein the testing machine main body comprises a frame and a base, the frame is arranged on the base, a movable cross beam is arranged in the frame, a pressing head is arranged below the movable cross beam, and the movable cross beam drives the pressing head to move longitudinally; the carrying box is arranged on the base and comprises a box body, and a plurality of heating devices are arranged in the box body and used for placing samples and carrying out temperature loading on the samples; the upper pressing block is arranged above the sample, and at least one part of the upper pressing block protrudes out of the upper surface of the box body. According to the invention, the plurality of heating devices are arranged in the inner circumference of the carrying box, so that a plurality of samples are heated at the same time, the environmental temperatures of the samples are ensured to be consistent, and the compression test is performed on the samples in sequence by rotating the box body, so that the test time is greatly shortened, the accuracy of test data is improved, the test period is short, and the safety of a high-temperature test is improved to a great extent.
Description
Technical Field
The invention belongs to the technical field of rock test devices, and particularly relates to a rock high-temperature compression test device and a test method.
Background
Rock physical mechanical parameters are necessary basic data for underground engineering design, parameters such as rock uniaxial compressive strength, elastic modulus, Poisson's ratio and the like are generally obtained through a rock uniaxial compression test, the rock uniaxial compression test is to load two end faces of a cylindrical test by using a rock testing machine until a sample is destroyed, and then a load displacement curve is recorded to obtain the parameters such as the rock uniaxial compressive strength and the like. The rock sample is generally cylindrical, and can be further classified into normal-temperature uniaxial compression, high-temperature uniaxial compression and the like according to the temperature condition of the rock sample during the test.
In the prior art, a rock compression testing machine is used for performing a high-temperature compression test on a rock sample, temperature loading is firstly required on the sample, the internal temperature of the sample needs to be calibrated before temperature loading, so that an effective heating and heat preservation mode is adopted, under a common condition, the sample is placed inside a heating system, the periphery of the sample is heated simultaneously, a central drill hole is drilled at the center of the sample, a thermocouple is placed in the central drill hole to measure the temperature of the central point of the sample in the heating process and record the temperature in real time, heat preservation is performed after heating until the overall temperature of the sample is stable, namely the temperature loading is completed. After the temperature loading is finished, loading the axial force of the sample at a certain loading rate through a pressure head on a testing machine until the sample is damaged, and after the sample is subjected to a compression test, taking out the compressed sample after waiting for a heating system to cool; that is, when the testing machine performs a high-temperature compression test on a sample, only one sample can be tested at a time, and the time consumption is long.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a rock high-temperature compression test device and a test method, which are used for solving the problem that in the prior art, only one sample can be subjected to a high-temperature compression test at a time, and the time consumption is long.
In order to achieve the above purpose, the invention provides the following technical scheme:
a rock high temperature compression test apparatus, the test apparatus comprising:
the testing machine comprises a testing machine main body, wherein the testing machine main body comprises a frame and a base, the frame is arranged on the base, a movable cross beam is arranged in the frame, a pressure head is arranged below the movable cross beam, and the movable cross beam drives the pressure head to move longitudinally;
the carrying box is arranged on the base in the frame and comprises a box body, a plurality of heating devices are arranged in the box body, and the heating devices are used for placing samples and carrying out temperature loading on the samples;
and the upper pressing block is arranged above the sample, at least one part of the upper pressing block protrudes out of the upper surface of the box body, and the upper pressing block and the pressure head are arranged in a centering way by rotating the carrying box.
According to the rock high-temperature compression test device, as a preferable scheme, the heating device comprises a refractory wall and a temperature controller;
the fire-resistant wall is enclosed into a sample loading cavity, and the sample loading cavity is used for accommodating the sample; the outer wall of the fire-resistant wall is surrounded with a heating device, and the heating device is used for generating heat required by temperature loading of the sample;
the temperature controller is connected with the heating device through a first lead and is used for controlling the heating temperature of the heating device;
preferably, the sample loading cavity is cylindrical and penetrates through the upper surface and the lower surface of the box body;
more preferably, the refractory wall is built by refractory bricks;
more preferably, the heating device is a heating resistance wire, and the heating resistance wire is uniformly wound around the refractory wall.
According to the rock high-temperature compression test device, as a preferable scheme, heat insulation cotton is filled in a gap between the heating device and the inner wall of the box body;
preferably, a partition plate is arranged between two adjacent warming devices.
According to the rock high-temperature compression test device, as a preferable scheme, the test device further comprises a temperature sensor, the temperature sensor is arranged on the surface of the sample and connected with a temperature monitor through a second lead, and the temperature monitor is used for monitoring the temperature change of the surface of the sample.
According to the rock high-temperature compression test device, as a preferable scheme, a lower pressing plate is arranged at the bottom of the carrying box and used for bearing the force generated when the pressure head compresses the sample;
preferably, the box body is cylindrical, and the heating devices are uniformly arranged in the box body along the circumferential direction;
more preferably, the lower pressing plate is disc-shaped, and a plurality of bosses are arranged on the lower pressing plate and respectively embedded into the bottoms of the sample loading cavities.
According to the rock high-temperature compression test device, as a preferable scheme, the side face of the lower pressing plate is circumferentially provided with the lock catch, and the box body is fixedly connected with the lower pressing plate through the lock catch.
In the rock high-temperature compression test device, preferably, the central axis of the boss coincides with the central axis of the test sample; the central axis of the upper pressing block is superposed with the central axis of the sample;
preferably, the outer diameter of the boss is larger than or equal to that of the sample; the outer diameter of the upper pressing block is larger than or equal to that of the sample.
According to the rock high-temperature compression test device, as a preferable scheme, a first through hole is formed in the middle of the box body, and the first through hole penetrates through the upper surface and the lower surface of the box body;
a second through hole corresponding to the first through hole is formed in the middle of the lower pressing plate;
a supporting seat is arranged between the lower pressing plate and the base, a vertical rod is arranged in the middle of the supporting seat, and the vertical rod sequentially penetrates through the second through hole and the first through hole;
the object carrying box takes the vertical rod as a rotating shaft and sequentially carries out compression test on samples in the heating device by rotating the object carrying box.
In the rock high-temperature compression test device, preferably, the inner diameter of the first through hole is equal to the inner diameter of the second through hole;
preferably, a handle is arranged on the outer side of the box body.
A test method of a rock high-temperature compression test device adopts the rock high-temperature compression test sample device, and preferably comprises the following steps:
s1, placing the supporting seat on a base, sequentially sleeving the lower pressing plate and the carrying box on the vertical rods of the supporting seat, ensuring that the sample loading cavities are sleeved on corresponding bosses in a matched manner, and fastening the box body and the lower pressing plate through a lock catch;
s2, a sample is placed into the sample loading cavity, an upper pressing block is placed above the sample and is ensured to be aligned with the sample and the boss, then the position of the supporting seat is finely adjusted, a pressing head is aligned with the upper pressing block above the sample, and eccentric compression is ensured not to occur;
step S3, starting a temperature controller, heating the samples to a target temperature at a certain heating rate, and keeping the temperature for a period of time to keep the surface temperature of each sample unchanged;
step S4, starting the movable beam to drive the pressure head to perform compression loading on one sample, recording the loaded data, stopping the loading after the sample is compressed and damaged, and enabling the movable beam to drive the pressure head to reset;
s5, rotating the carrying box to enable the upper pressing block above the other sample to be aligned with the pressing head, repeating the step S4, and sequentially carrying out compression loading on all samples until all samples are tested;
and step S6, opening the lock catch, separating the box body from the lower pressing plate through the handle, and cleaning the sample containing cavity and residues after natural cooling.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
according to the invention, the plurality of heating devices are arranged in the inner circumference of the carrying box, so that a plurality of samples are heated and insulated at the same time, the environmental temperatures of the samples are ensured to be consistent, and then the compression test is carried out on the samples in sequence by rotating the box body, so that the test time is greatly shortened, the accuracy of test data is improved, the test period is short, the safety of a high-temperature test is increased to a great extent, and the protection is provided for testers; the device in the prior art can only perform a high-temperature compression test on one sample at a time, heating and loading are long, after the compression test is performed on one sample, the next test can be performed after the device is cooled, and the compression tests on a plurality of samples can be completed within several days.
According to the invention, the box body of the carrying box is positioned with the lower pressing plate through the locking lock catch, after the compression test is finished, the lock catch can be directly opened, the box body is separated from the lower pressing plate through the handle, so that residues in the compressed sample containing cavity can be conveniently cleaned, and after a plurality of samples are completely compressed, the compressed residues are intensively cleaned, so that time and labor are saved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic structural diagram of a high temperature compression test apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a carrier case according to an embodiment of the present invention;
FIG. 3 is a schematic view of an assembly structure of the carrying case and the supporting base according to an embodiment of the present invention;
FIG. 4 is a schematic front view of a lower platen according to an embodiment of the present invention;
FIG. 5 is a schematic top view of a lower platen according to an embodiment of the present invention.
In the figure: 1. a sample loading cavity; 2. heat preservation cotton; 3. a heating device; 4. a refractory wall; 5. a first through hole; 6. a handle; 7. a first conductive line; 8. a second conductive line; 9. a temperature sensor; 10. pressing the blocks; 11. a sample; 12. a lower pressing plate; 121. a boss; 122. a second through hole; 13. a supporting seat; 131. erecting a rod; 14. a frame; 15. moving the beam; 16. a pressure head; 17. a box body; 18. a base.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The carrying box is simultaneously and circumferentially provided with the plurality of heating devices, so that the plurality of samples 11 are heated and insulated at the same time, the environmental temperatures of the plurality of samples 11 are consistent, and then the compression tests are sequentially carried out on the samples 11 through the rotating box body 17, so that the test time is greatly shortened, the accuracy of test data is improved, the test period is short, the safety of a high-temperature test is improved to a great extent, and safety protection is provided for testers; in addition, in the invention, the box body 17 of the carrying box is positioned with the lower pressing plate 12 through the locking lock catch, after the compression test is finished, the lock catch can be directly opened, the box body 17 is separated from the lower pressing plate 12 through the handle 6, the residue in the compressed sample containing cavity 1 is convenient to clean, and the compressed residue is intensively cleaned after the compression of all the samples 11 is finished, so that the time and the labor are saved.
As shown in fig. 1, which is a schematic structural diagram of a rock high-temperature compression test apparatus in an embodiment of the present invention, the apparatus includes:
the testing machine main part, the testing machine main part includes frame 14 and base 18, and frame 14 sets up in the top of base 18, is provided with movable beam 15 in the frame 14, and movable beam 15's below is provided with pressure head 16, and movable beam 15 drives pressure head 16 along longitudinal reciprocating motion. In addition, when the high-temperature compression test is carried out on the rock sample 11, the testing machine can be loaded according to a constant displacement gradient and a constant test force gradient, the constant displacement loading control is adopted in the embodiment, and the loading rate is 0.5 mm/min; of course, the testing device in the embodiment of the invention further comprises a control system, the control system is used for controlling the loading rate and the loading test force in the testing process, and a nameplate, an emergency stop button and the like are also arranged on the testing machine main body.
The carrying box, as shown in fig. 2, is a schematic top view of the carrying box, and is disposed on a base 18 in the frame 14, and includes a box body 17, and a plurality of heating devices are disposed in the box body 17, and are used for placing the sample 11 and heating and loading the sample 11.
In the embodiment of the present invention, the box 17 is cylindrical, and a plurality of heating devices are uniformly arranged in the box 17 along the circumferential direction.
In the embodiment of the invention, the heating device comprises a fire-resistant wall 4 and a temperature controller; the fire-resistant wall 4 encloses a sample loading cavity 1, and the sample loading cavity 1 is used for accommodating a sample 11; preferably, the sample cavity 1 is cylindrical, and the sample cavity 1 penetrates through the upper surface and the lower surface of the box body 17.
The heating device 3 is arranged around the outer wall of the fire-resistant wall 4, and the heating device 3 is used for generating heat required by temperature loading of the sample 11; more preferably, the refractory wall 4 is constructed of refractory bricks.
The temperature controller is connected with the heating device 3 through a first lead 7 and is used for controlling the heating temperature of the heating device 3; preferably, the heating device 3 is a heating resistance wire, and the heating resistance wire is uniformly wound around the refractory wall 4. The temperature controller controls each heating device 3 to heat each sample 11 simultaneously, integral heating of a plurality of samples is achieved, in practical application, each sample 11 is heated simultaneously through a heating resistance wire, a two-stage heating mode is generally adopted, the first stage is a heating stage, namely, the sample is heated to a target temperature according to a preset heating gradient, then the second stage is a heat preservation stage, the specific heat preservation time is determined according to actual conditions, and the purpose of heat preservation is to stabilize the integral temperature of each sample 11.
In the specific embodiment of the invention, the gap between the heating device 3 and the inner wall of the box body 17 is filled with the heat insulation cotton 2, and the heat insulation cotton 2 in the embodiment is asbestos, so that the heat insulation cotton has a heat insulation effect, is high temperature resistant and is not easy to burn. Preferably, a partition is arranged between two adjacent heating devices. Wherein, the clapboard is a heat-insulation board or a high-temperature-resistant ceramic board.
In an embodiment of the present invention, the sample apparatus further comprises a temperature sensor 9, the temperature sensor 9 is disposed on the surface of the sample 11 in use, and the temperature sensor 9 is connected to a temperature monitor through a second wire 8, and the temperature monitor is configured to monitor the temperature change on the surface of the sample 11. Wherein, the probe of the temperature sensor 9 is arranged on the surface of the sample 11, and the other end passes through the fire-resistant wall 4 and is connected with the temperature monitor through the second lead 8.
In the present embodiment, the bottom of the box 17 is provided with a lower pressing plate 12, and the lower pressing plate 12 is used for bearing the force generated when the pressing head 16 compresses the sample 11.
Preferably, the box body 17 is cylindrical, and the heating devices are uniformly arranged in the box body 17 along the circumferential direction;
more preferably, as shown in fig. 4, which is a schematic front structural view of the lower pressing plate, in an embodiment of the present invention, the lower pressing plate 12 is in a shape of a disk, the lower pressing plate 12 is circumferentially provided with a boss 121 matching with the sample cavity 1, and the boss 121 is embedded into the bottom of the sample cavity 1.
In the embodiment of the present invention, the side surface of the lower pressing plate 12 is provided with a latch along the circumferential direction, and the box 17 is fixedly connected with the lower pressing plate 12 through the latch.
In this embodiment, the number of the latches is not limited, the latches can be set to be 3, 4, 5, 6, etc., and according to the actual use process, as long as the opening and closing purpose can be achieved, and when the latches are in a locking state, the position relationship between the box body 17 and the lower pressing plate 12 can be well positioned, and the position fixation of the boss 121 in the sample loading cavity is ensured. In addition, after the compression test is finished, the lock catch can be directly opened, the box body 17 and the lower pressing plate 12 are separated through the handle 6, after natural cooling, residues in the sample accommodating cavity 1 after compression are convenient to clean, and after all the samples 11 are completely compressed, the residues after compression are intensively cleaned, so that time and labor are saved.
And the upper pressing block 10 is arranged above the sample 11, at least one part of the upper pressing block 10 protrudes out of the upper surface of the box body 17, and the upper pressing block 10 and the pressure head 16 are arranged in a centering way by rotating the carrying box. Wherein the centering arrangement is that the central axes of the two members coincide.
In the present embodiment, the central axis of the boss 121 coincides with the central axis of the test piece 11; the central axis of the upper compact 10 coincides with the central axis of the test piece 11. The coincidence of the central axes is ensured among the upper pressing block 10, the sample 11 and the boss 121, and the eccentric compression phenomenon is mainly avoided in the test process, namely the test accuracy is ensured.
Preferably, the outer diameter of the boss 121 is larger than or equal to the outer diameter of the test sample 11; the outer diameter of the upper pressing block 10 is larger than or equal to that of the sample 11.
In the embodiment of the invention, the middle part of the box body 17 is provided with a first through hole 5, and the first through hole 5 penetrates through the upper surface and the lower surface of the box body 17;
as shown in fig. 5, which is a schematic top view of the lower pressing plate, a second through hole 122 corresponding to the first through hole 5 is formed in the middle of the lower pressing plate 12;
preferably, the inner diameter of the first through hole 5 is equal to the inner diameter of the second through hole 122.
In the embodiment of the present invention, a supporting seat 13 is disposed between the lower pressing plate 12 and the base 18, as shown in fig. 3, which is a schematic view of an assembly structure of the carrying box and the supporting seat, a vertical rod 131 is disposed in the middle of the supporting seat 13, and the vertical rod 131 sequentially passes through the second through hole 122 and the first through hole 5; the loading box uses the upright rod 131 as a rotation axis, and the sample 11 in the heating device is sequentially subjected to a compression test by rotating the loading box. In this embodiment, rotatory year thing case is artifical rotatory, and rotatory year thing case makes the last briquetting 10 of the sample 11 top that awaits measuring and the pressure head 16 centering on the testing machine, then carries out the loading test, and after compression loading a sample 11, through rotatory other sample 11 of compression loading in proper order, realized simultaneously heating up a plurality of samples 11, carry out the compression test to a plurality of samples 11 in proper order, has shortened test time greatly, has improved the accuracy of test data.
Preferably, the outside of the case 17 is provided with a handle 6.
In order to better understand the use method of the rock high-temperature compression test device in the embodiment of the invention, the embodiment of the invention also provides a sample 11 method of the rock high-temperature compression test device, the test method adopts the rock high-temperature compression sample 11 device, and specifically, the method comprises the following steps:
step S1, placing the supporting seat 13 on the base 18, sequentially sleeving the lower pressing plate 12 and the carrying box on the upright 131 of the supporting seat 13, ensuring that the sample containing cavity 1 is fittingly sleeved on the corresponding boss 121, and fastening the box body 17 and the lower pressing plate 12 through a lock catch;
step S2, a sample 11 is placed in the sample loading cavity 1, an upper pressing block 10 is placed above the sample 11, the upper pressing block 10, the sample 11 and a boss 121 are centered, then the position of a supporting seat 13 is finely adjusted, a pressing head 16 is centered with the upper pressing block 10 above the sample 11, and eccentric compression is guaranteed not to occur;
step S3, starting a temperature controller, heating the samples to a target temperature at a certain heating rate, and keeping the temperature for a period of time to keep the surface temperature of each sample 11 unchanged;
step S4, starting the movable beam 15 to drive the pressure head 16 to perform compression loading on one of the samples 11, recording the loaded data, stopping the loading after the compression of the sample 11 is damaged, and enabling the movable beam 15 to drive the pressure head 16 to reset;
step S5, rotating the carrying box to enable the upper pressing block 10 above the other sample 11 to be aligned with the pressing head 16, repeating the step S4, and sequentially carrying out compression loading on all the samples 11 until all the samples 11 are tested;
and step S6, opening the lock catch, separating the box body 17 from the lower pressing plate 12 through the handle 6, naturally cooling, and cleaning the sample accommodating cavity 1 and residues.
To sum up: the high-temperature compression test device can realize concentrated compression loading, thereby greatly saving test time; meanwhile, the plurality of samples 11 are heated and the temperature variable is controlled, so that the influence factor of the environment temperature caused by the overlong traditional heating time is broken through, and the accuracy of test data is greatly improved; the traditional test time is too long, the danger coefficient is increased, the device can greatly shorten the time, the safety of the high-temperature test is improved, and the safety protection is provided for testers.
The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.
Claims (10)
1. A rock high temperature compression test device, characterized in that, the test device includes:
the testing machine comprises a testing machine main body, wherein the testing machine main body comprises a frame and a base, the frame is arranged on the base, a movable cross beam is arranged in the frame, a pressure head is arranged below the movable cross beam, and the movable cross beam drives the pressure head to move longitudinally;
the carrying box is arranged on the base in the frame and comprises a box body, a plurality of heating devices are arranged in the box body, and the heating devices are used for placing samples and carrying out temperature loading on the samples;
and the upper pressing block is arranged above the sample, at least one part of the upper pressing block protrudes out of the upper surface of the box body, and the upper pressing block and the pressure head are arranged in a centering way by rotating the carrying box.
2. The rock high-temperature compression test device of claim 1, wherein the warming device comprises a refractory wall and a temperature controller;
the fire-resistant wall is enclosed into a sample loading cavity, and the sample loading cavity is used for accommodating the sample; the outer wall of the fire-resistant wall is surrounded with a heating device, and the heating device is used for generating heat required by temperature loading of the sample;
the temperature controller is connected with the heating device through a first lead and is used for controlling the heating temperature of the heating device;
preferably, the sample loading cavity is cylindrical and penetrates through the upper surface and the lower surface of the box body;
more preferably, the refractory wall is built by refractory bricks;
more preferably, the heating device is a heating resistance wire, and the heating resistance wire is uniformly wound around the refractory wall.
3. The rock high-temperature compression test device according to claim 2, wherein a gap between the heating device and the inner wall of the box body is filled with heat insulation cotton;
preferably, a partition plate is arranged between two adjacent warming devices.
4. The rock high temperature compression test device of claim 3, further comprising a temperature sensor disposed on the surface of the sample, wherein the temperature sensor is connected to a temperature monitor via a second wire, and the temperature monitor is configured to monitor the temperature change on the surface of the sample.
5. The rock high-temperature compression test device as claimed in claim 2, wherein the bottom of the carrying box is provided with a lower pressing plate, and the lower pressing plate is used for bearing the force generated when the pressure head compresses the sample;
preferably, the box body is cylindrical, and the heating devices are uniformly arranged in the box body along the circumferential direction;
more preferably, the lower pressing plate is disc-shaped, and a plurality of bosses are arranged on the lower pressing plate and respectively embedded into the bottoms of the sample loading cavities.
6. The rock high-temperature compression test device of claim 5, wherein the side surface of the lower pressure plate is provided with a lock catch along the circumferential direction, and the box body is fixedly connected with the lower pressure plate through the lock catch.
7. The rock high temperature compression test apparatus of claim 6, wherein the central axis of the boss coincides with the central axis of the test specimen; the central axis of the upper pressing block is superposed with the central axis of the sample;
preferably, the outer diameter of the boss is larger than or equal to that of the sample; the outer diameter of the upper pressing block is larger than or equal to that of the sample.
8. The rock high-temperature compression test device of claim 6, wherein a first through hole is formed in the middle of the box body, and the first through hole penetrates through the upper surface and the lower surface of the box body;
a second through hole corresponding to the first through hole is formed in the middle of the lower pressing plate;
a supporting seat is arranged between the lower pressing plate and the base, a vertical rod is arranged in the middle of the supporting seat, and the vertical rod sequentially penetrates through the second through hole and the first through hole;
the object carrying box takes the vertical rod as a rotating shaft and sequentially carries out compression test on samples in the heating device by rotating the object carrying box.
9. The rock high temperature compression test apparatus of claim 8, wherein the first through hole has an inner diameter equal to the inner diameter of the second through hole;
preferably, a handle is arranged on the outer side of the box body.
10. A test method of a rock high-temperature compression test device, wherein the test method adopts the rock high-temperature compression sample device as claimed in any one of claims 1 to 9, and is characterized by comprising the following steps:
s1, placing the supporting seat on a base, sequentially sleeving the lower pressing plate and the carrying box on the vertical rods of the supporting seat, ensuring that the sample loading cavities are sleeved on corresponding bosses in a matched manner, and fastening the box body and the lower pressing plate through a lock catch;
s2, a sample is placed into the sample loading cavity, an upper pressing block is placed above the sample and is ensured to be aligned with the sample and the boss, then the position of the supporting seat is finely adjusted, a pressing head is aligned with the upper pressing block above the sample, and eccentric compression is ensured not to occur;
step S3, starting a temperature controller, heating the samples to a target temperature at a certain heating rate, and keeping the temperature for a period of time to keep the surface temperature of each sample unchanged;
step S4, starting the movable beam to drive the pressure head to perform compression loading on one sample, recording the loaded data, stopping the loading after the sample is compressed and damaged, and enabling the movable beam to drive the pressure head to reset;
s5, rotating the carrying box to enable the upper pressing block above the other sample to be aligned with the pressing head, repeating the step S4, and sequentially carrying out compression loading on all samples until all samples are tested;
and step S6, opening the lock catch, separating the box body from the lower pressing plate through the handle, and cleaning the sample containing cavity and residues after natural cooling.
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| CN202011133278.8A CN112284920A (en) | 2020-10-21 | 2020-10-21 | Rock high-temperature compression test device and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236361A (en) * | 2021-12-23 | 2022-03-25 | 中国矿业大学 | Device and method for testing micro-current under rock load at high temperature |
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