CN106644742B - Triaxial test device for rock core - Google Patents
Triaxial test device for rock core Download PDFInfo
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- CN106644742B CN106644742B CN201710111621.0A CN201710111621A CN106644742B CN 106644742 B CN106644742 B CN 106644742B CN 201710111621 A CN201710111621 A CN 201710111621A CN 106644742 B CN106644742 B CN 106644742B
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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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
- G01N3/04—Chucks
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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
- G01N3/06—Special adaptations of indicating or recording means
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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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
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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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
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a core triaxial test device which comprises a triaxial clamp holder, a pressure bin and a monitoring system, wherein the triaxial clamp holder clamps the pressure bin, the pressure bin is of a cylindrical structure with a closed top surface and a closed bottom surface, the inside of the pressure bin is sequentially divided into three independent first spaces, second spaces and third spaces from top to bottom, plungers penetrating through the top and the bottom of the pressure bin are inserted in the axial direction of the pressure bin, each plunger comprises an upper plunger and a lower plunger which are arranged up and down symmetrically, the upper plunger penetrates through the first spaces and extends to the second spaces, and a baffle is arranged between the outer ring of the part of the upper plunger, which is positioned in the first spaces, and the pressure bin; the lower plunger penetrates through the third space and extends to the second space, and is used for conveying the core to be measured into the pressure bin and fixing the core; the monitoring system comprises a pump A and a pump B, wherein the pump A and the pump B are respectively connected with the first space and the second space through conveying pipes, and are used for conveying liquid to the first space and the second space of the pressure bin and transmitting pressure.
Description
Technical Field
The invention discloses a triaxial core test device.
Background
The core triaxial test is a test mode for researching the rock strength and constitutive relation commonly used in the field of rock mechanics and geotechnical engineering. The test piece to be tested typically takes a cylindrical core having a diameter of 1 inch and a height of 2 inches. Currently, triaxial tests typically require several sets of tests, each of which requires a different core to be replaced. When the core is replaced, the working procedure is complex, time and labor are consumed, the radial displacement and the axial displacement of the core are not easy to measure, and the working efficiency is greatly reduced.
Therefore, a novel core triaxial test device is to be developed urgently at present, and under the premise of ensuring that a displacement measurement result is accurate, a test procedure and a displacement measurement process are easier, so that test precision and efficiency are improved.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention discloses a core triaxial test device. On the premise of ensuring accurate displacement measurement results, the test procedure and the displacement measurement process are easier, so that the test precision and efficiency are improved.
The technical scheme adopted by the invention is as follows:
the triaxial test device for the rock core comprises a triaxial clamp holder, a pressure bin and a monitoring system, wherein the triaxial clamp holder clamps the pressure bin, the pressure bin is of a cylindrical structure with a closed top surface and a closed bottom surface, the inside of the pressure bin is sequentially divided into three independent first spaces, second spaces and third spaces from top to bottom, plungers penetrating through the top and the bottom of the pressure bin are inserted in the axial direction of the pressure bin, the plungers comprise upper plungers and lower plungers which are arranged up and down symmetrically, the upper plungers penetrate through the first spaces and extend to the second spaces, and a baffle is arranged between the outer ring of the part of the upper plungers, which is positioned in the first spaces, and the pressure bin is used for bearing liquid pressure and driving the upper plungers to lift; the lower plunger penetrates through the third space and extends to the second space, and is used for conveying the rock core to be measured into the pressure bin and fixing the rock core; the monitoring system comprises a pump A and a pump B, wherein the pump A and the pump B are respectively connected with the first space and the second space through conveying pipes, and are used for conveying liquid to the first space and the second space of the pressure bin and transmitting pressure.
Further, the baffle plate divides the first space into an upper space and a lower space; the upper space and the lower space are respectively provided with a liquid inlet and a liquid outlet, the two liquid inlets are respectively connected with the constant-speed constant-pressure pump A through a liquid inlet pipe I, the two liquid outlets are respectively connected with a liquid discharge pipe, and the liquid inlet and the liquid outlet are respectively provided with a valve.
Further, a first valve is arranged at the liquid outlet of the upper space, a third valve is arranged at the liquid outlet of the lower space, a second valve is arranged at the liquid inlet of the upper space, and a fourth valve is arranged at the liquid inlet of the lower space;
when axial pressure is applied, liquid flows in through the second valve and the fourth valve and flows out through the first valve and the third valve. If the first valve and the fourth valve are opened, the second valve and the third valve are closed, the lateral pressure below the upper plunger baffle is increased, and the upper plunger is lifted; if the second valve and the third valve are opened, the first valve and the fourth valve are closed, the lateral pressure on the upper plunger baffle is increased, the upper plunger is lowered, and then axial force is applied to the core to be measured.
Further, the upper plunger is connected with the displacement sensor A and is used for applying axial pressure to the rock core and measuring axial displacement in real time; the displacement sensor A is arranged at the top end of the upper plunger, the upper plunger and the lower plunger are in close contact with the core to be tested to be in an initial state before a set test is started, and along with the increase of the axial pressure of the core to be tested, the displacement sensor A can measure the axial displacement of the core to be tested in real time.
Further, a rubber sleeve is arranged in the second space, the core to be measured is placed inside the rubber sleeve, the outer ring of the core to be measured is completely surrounded by the rubber sleeve, liquid is injected into the second space, and confining pressure is applied to the core through the rubber sleeve.
Further, the second space is connected with a constant-speed constant-pressure pump B through a liquid inlet pipe II, and a sixth valve and a displacement sensor B are arranged on the connected pipe; the sixth valve is used for injecting liquid into the periphery of the rubber sleeve, and as the injected liquid increases, the pressure increases, and confining pressure is applied to the core to be tested through the rubber sleeve;
the displacement sensor B is arranged at the junction of the infusion tube for controlling the confining pressure and the pressure bin where the sixth valve is located, when the axial pressure is increased, the core to be measured is axially shortened and radially expanded, the radial expansion of the core to be measured inevitably leads to the outflow of liquid around the rubber sleeve in the pressure bin due to the unchanged confining pressure, and the displacement sensor B measures the radial displacement of the core to be measured by measuring the volume of the outflow liquid and combining the diameter of the known delivery tube.
Further, the liquid inlet pipe I and the liquid inlet pipe II are communicated through a pipeline, and a fifth valve is arranged on the communicated pipeline; the valve is a standby valve, and is in a closed state in normal use, and when one constant-speed constant-pressure pump has a problem, the valve can be opened to realize the application of confining pressure and shaft pressure.
Furthermore, the lower plunger rod body is provided with external threads, the matched part of the pressure bin and the lower plunger rod body is provided with internal threads, and the lower plunger rod body can be manually rotated to realize disassembly and assembly for conveying the core to be measured into the pressure bin and fixing the core.
Further, the pump is provided with two A, B pumps, and in normal operation, the pump A applies axial pressure and the pump B applies confining pressure. The constant-speed constant-pressure pump can display the real-time flow, accumulated flow and implementation pressure of liquid (water), and truly reflects the test state. The displacement sensor is provided with two A, B.
The pump A and the pump B are connected with the liquid storage tank, and an eighth valve and a seventh valve are respectively arranged at the inlet and the outlet of the pump A; a tenth valve and a ninth valve are respectively arranged at the inlet and the outlet of the pump B.
The beneficial effects of the invention are as follows:
1. through setting up sensor A and sensor B, guaranteed the accuracy of displacement measurement result, make test procedure and displacement measurement process easier simultaneously to improve test precision and efficiency.
2. The application and the unloading of confining pressure and shaft pressure are realized through the space division of the pressure bin and the control of each valve.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a general block diagram of the present invention;
FIG. 2 is a block diagram of a pressure vessel conduit portion;
FIG. 3 is a longitudinal cross-sectional view of the pressure chamber;
in the figure: 1. the three-shaft clamp holder comprises a three-shaft clamp holder 2, a pressure bin 3, a transfusion tube 4, a valve 5, a constant-speed constant-pressure pump 4-1, 4-2, 4-3, 4-4, 4-5, 4-6, 4-7, 4-8, 4-9 and 4-10-valves; a 6-1-displacement sensor A, a 6-2-displacement sensor B,3-1, 3-2-infusion tubes, a 5-1-constant speed constant pressure pump A and a 5-2-constant speed constant pressure pump B; 2-1-upper plunger, 2-2-lower plunger, 2-3-gum cover, 2-4-baffle, 2-5-core to be measured.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The term interpretation part is that the infusion tube is a metal hollow tube, the diameters of all the metal hollow tubes are fixed and known, and the infusion tube is connected with a constant-speed constant-pressure pump and a pressure bin and is used for conveying liquid (water) and transmitting pressure; the triaxial clamp holder is an existing clamping device and only plays a role in clamping the pressure bin.
The invention discloses a core triaxial test device which is composed of a supporting system, a loading system and a monitoring system. The supporting system is a triaxial clamp holder, the triaxial clamp holder is connected with the pressure bin through bolts, and the loading system is fixed. The loading system comprises a conveying pipe, a pressure bin and valves 1-6. The monitoring system comprises a constant-speed constant-pressure pump and a displacement sensor.
Specifically, as shown in fig. 1-3, the device comprises a triaxial clamp holder 1, a pressure bin 2 and a monitoring system, wherein the triaxial clamp holder 1 clamps the pressure bin 2;
the pressure bin 2 is of a cylindrical structure with a closed top surface and a closed bottom surface, the inside of the pressure bin is sequentially divided into three independent first spaces, a second space and a third space from top to bottom, and plungers penetrating through the top and the bottom of the pressure bin are inserted in the axial direction of the pressure bin 3, each plunger comprises an upper plunger 2-1 and a lower plunger 2-2 which are symmetrically arranged up and down, the upper plunger 2-1 penetrates through the first space to extend to the second space, and a baffle 2-3 is arranged between the outer ring of the part of the upper plunger, which is positioned in the first space, and the pressure bin and is used for bearing liquid pressure and driving the upper plunger to lift; the lower plunger 2-2 penetrates through the third space and extends to the second space, and is used for conveying the rock core to be measured into the pressure bin and fixing the rock core;
the monitoring system comprises a constant-speed constant-pressure pump A5-1 and a constant-speed constant-pressure pump B5-2, wherein the constant-speed constant-pressure pump A5-1 and the constant-speed constant-pressure pump B5-2 are respectively connected with the first space and the second space through conveying pipes, and are used for conveying liquid to the first space and the second space of the pressure bin and transmitting pressure.
And A, B constant-speed constant-pressure pumps are arranged, and in normal operation, the constant-speed constant-pressure pump A applies axial pressure and the constant-speed constant-pressure pump B applies confining pressure. The constant-speed constant-pressure pump can display the real-time flow, accumulated flow and implementation pressure of liquid (water), and truly reflects the test state.
Further, in order to realize the automatic up-and-down movement of the upper plunger 2-1, the baffle plate divides the first space into an upper space and a lower space; the upper space and the lower space are respectively provided with a liquid inlet and a liquid outlet, the two liquid inlets are respectively connected with a constant-speed constant-pressure pump A through a liquid inlet pipe I, the two liquid outlets are respectively connected with a liquid discharge pipe, and the liquid inlet and the liquid outlet are respectively provided with a valve.
A first valve 4-1 is arranged at the liquid outlet of the upper space, a third valve 4-3 is arranged at the liquid outlet of the lower space, a second valve 4-2 is arranged at the liquid inlet of the upper space, and a fourth valve 4-4 is arranged at the liquid inlet of the lower space; the specific implementation process is as follows:
when axial pressure is applied, liquid flows in through the second valve and the fourth valve and flows out through the first valve and the third valve. If the first valve and the fourth valve are opened, the second valve and the third valve are closed, the lateral pressure below the upper plunger baffle is increased, and the upper plunger is lifted; if the second valve and the third valve are opened, the first valve and the fourth valve are closed, the lateral pressure on the upper plunger baffle is increased, the upper plunger is lowered, and then axial force is applied to the core to be measured.
Further, the upper plunger is connected with a displacement sensor A6-1 and is used for applying axial pressure to the rock core and measuring axial displacement in real time; the displacement sensor A6-1 is arranged at the top end of the upper plunger, the upper plunger and the lower plunger are in close contact with the core to be tested to be in an initial state before the test is set, and the axial displacement of the core to be tested can be measured in real time by the displacement sensor A6-1 along with the increase of the axial pressure of the core to be tested.
Further, a rubber sleeve 2-4 is arranged in the second space, the core 2-5 to be measured is placed in the rubber sleeve 2-4, the outer ring of the core 2-5 to be measured is completely surrounded by the rubber sleeve, liquid is injected into the second space, and confining pressure is applied to the core through the rubber sleeve.
Further, the second space is connected with a constant-speed constant-pressure pump B5-2 through a liquid inlet pipe II3-2, and a sixth valve and a displacement sensor B6-2 are arranged on the connected pipe; the sixth valve is used for injecting liquid into the periphery of the rubber sleeve, and as the injected liquid increases, the pressure increases, and confining pressure is applied to the core to be tested through the rubber sleeve;
the displacement sensor B6-2 is arranged at the junction of the infusion tube for controlling the confining pressure and the pressure bin where the sixth valve is positioned, when the axial pressure is increased, the core to be measured is axially shortened and radially expanded, the radial expansion of the core to be measured inevitably leads to the outflow of liquid around the rubber sleeve in the pressure bin due to the invariable confining pressure, and the displacement sensor B6-2 measures the radial displacement of the core to be measured by measuring the volume of the outflow liquid and combining the diameter of the known delivery tube.
Further, the liquid inlet pipe I3-1 and the liquid inlet pipe II3-2 are communicated through a pipeline, and a fifth valve 4-5 is arranged on the communicated pipeline; the valve is a standby valve, and is in a closed state in normal use, and when one constant-speed constant-pressure pump has a problem, the valve can be opened to realize the application of confining pressure and shaft pressure.
Furthermore, the lower plunger rod 2-2 is provided with external threads, and the part of the pressure bin, which is matched with the lower plunger rod 2-2, is provided with internal threads, and the lower plunger rod can be manually rotated to realize disassembly and assembly for conveying the core to be measured into the pressure bin and fixing the core.
Furthermore, the constant-speed constant-pressure pump is provided with A, B, and in normal operation, the pump A applies axial pressure and the pump B applies confining pressure. The constant-speed constant-pressure pump can display the real-time flow, accumulated flow and implementation pressure of liquid (water), and truly reflects the test state. The displacement sensor is provided with two A, B.
The constant-speed constant-pressure pump A5-1 and the constant-speed constant-pressure pump B5-2 are connected with a liquid storage tank, and an eighth valve 4-8 and a seventh valve 4-7 are respectively arranged at the inlet and the outlet of the constant-speed constant-pressure pump A; the inlet and the outlet of the constant-speed constant-pressure pump B are respectively provided with a tenth valve 4-10 and a ninth valve 4-9.
The purpose of the displacement sensor is provided with A, B for two purposes: the displacement sensor A is arranged at the top end of the upper plunger, the upper plunger and the lower plunger are in close contact with the core to be tested to be in an initial state before a set test is started, and along with the increase of the axial pressure of the test, the displacement sensor A can measure the axial displacement of the core to be tested in real time.
The displacement sensor B is arranged at the junction of the conveying pipe for controlling the confining pressure and the pressure bin where the valve 6 is positioned, when the axial pressure is increased, the core to be measured is axially shortened and radially expanded, the radial expansion of the core to be measured inevitably leads to the outflow of liquid around the rubber sleeve in the pressure bin due to the unchanged confining pressure, and the displacement sensor B measures the radial displacement of the core to be measured by measuring the volume of the outflow liquid and combining the diameter of the known conveying pipe.
The pressure bin comprises a plunger and a rubber sleeve, and the size of the plunger and the rubber sleeve are matched with the size of the core to be actually measured.
Valves 4-1, 4-2 are provided on the upper side of the upper plunger baffle, and valves 4-3, 4-4 are provided on the lower side of the upper plunger baffle. When axial pressure is applied, liquid (water) flows in through the valves 4-2, 4-4 and flows out through the valves 4-1, 4-3. If the valves 4-1 and 4-4 are opened and the valves 4-2 and 4-3 are closed, the lateral pressure below the baffle of the upper plunger is increased, and the upper plunger is lifted; if the valves 4-2 and 4-3 are opened and the valves 4-1 and 4-4 are closed, the lateral pressure on the upper plunger baffle is increased, and the upper plunger is lowered, so that axial force is applied to the core to be measured. The valve 4-6 is used for injecting liquid (water) into the periphery of the rubber sleeve, and as the injected liquid (water) increases, the pressure increases, and confining pressure is applied to the core to be tested through the rubber sleeve. The valve 4-5 is a standby valve, and the valve 4-5 is in a closed state in normal use. When one of the constant-speed constant-pressure pumps cannot work normally, the valves 2 and 4 can be closed, and the valves 4-5 and 4-6 are opened, so that confining pressure can be applied through the pump A; similarly, valve 4-6 is closed and valve 4-5 is opened, so that axial pressure can be applied by pump B. During the test, the confining pressure is set in each group of tests, and the axial pressure is increased under the condition of a certain confining pressure until the rock core to be tested is damaged.
The specific test method is as follows:
1. preparation before experiment
Opening the valve 4-8, closing the valve 4-7, and pressing the liquid filling key on the operation panel of the constant-speed constant-pressure pump A5-1 to enable
The constant-speed constant-pressure pump A5-1 is filled with liquid; the valve 4-7 is opened and the valve 4-8 is closed.
Opening the valve 4-10, closing the valve 4-9, and pressing a liquid filling key on the pump operation panel B to fill the constant-speed constant-pressure pump B5-2 with liquid; the valve 4-9 is opened and the valve 4-10 is closed.
The valve 4-5 is closed, the valves 4-1, 4-4 are opened, the valves 4-2, 4-3 are closed, and the constant speed constant pressure pump A5-1 is operated to allow liquid to enter the pressure chamber, so that the upper plunger in the pressure chamber is lifted to the top.
And unloading the lower plunger, loading the core to be measured into the pressure bin, and screwing the lower plunger, wherein the upper end surface and the lower end surface of the core to be measured are respectively contacted with the upper plunger and the lower plunger. The upper plunger is now in the initial position.
2. Start the test
The valve 4-5 is closed, the valves 4-6, 4-9 are opened, the confining pressure is applied to the confining pressure chamber by using the constant speed constant pressure pump B5-2, and when the confining pressure reaches the target value, the pressurization is stopped.
Closing valves 4-1 and 4-4, opening valves 4-2 and 4-3, closing valve 4-5, applying axial pressure to the pressure bin by using constant-speed constant-pressure pump A5-1, and stopping pressurizing when the core to be tested breaks, namely the pressure suddenly decreases.
At the end of the test, test data were recorded and analyzed.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
1. the accuracy of the displacement measurement result is guaranteed through the arrangement of the sensor A and the sensor B, and meanwhile, the test procedure and the displacement measurement process are easier, so that the test precision and the test efficiency are improved.
2. The application and the unloading of confining pressure and shaft pressure are realized through the space division of the pressure bin and the control of each valve.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (8)
1. The triaxial core testing device is characterized by comprising a triaxial clamp holder, a pressure bin and a monitoring system, wherein the triaxial clamp holder clamps the pressure bin, the pressure bin is of a cylindrical structure with a closed top surface and a closed bottom surface, the inside of the pressure bin is sequentially divided into three independent first spaces, a second space and a third space from top to bottom, plungers penetrating through the top and the bottom of the pressure bin are inserted in the axial direction of the pressure bin, the plungers comprise upper plungers and lower plungers which are symmetrically arranged up and down, the upper plungers penetrate through the first spaces and extend to the second spaces, and a baffle is arranged between the outer ring of the part of the upper plungers, which is positioned in the first spaces, and the pressure bin and is used for bearing liquid pressure and driving the upper plungers to lift; the lower plunger penetrates through the third space and extends to the second space, and is used for conveying the rock core to be measured into the pressure bin and fixing the rock core; the monitoring system comprises a pump A and a pump B, wherein the pump A and the pump B are respectively connected with the first space and the second space through conveying pipes, and are used for conveying liquid to the first space and the second space of the pressure bin and transmitting pressure;
the baffle plate divides the first space into an upper space and a lower space; the upper space and the lower space are respectively provided with a liquid inlet and a liquid outlet, the two liquid inlets are respectively connected with the pump A through a liquid inlet pipe I, and the two liquid outlets are respectively connected with a liquid discharge pipe;
and a rubber sleeve is arranged in the second space, the core to be measured is placed in the rubber sleeve, the outer ring of the core to be measured is completely surrounded by the rubber sleeve, liquid is injected into the second space, and confining pressure is applied to the core through the rubber sleeve.
2. The core triaxial test apparatus according to claim 1, wherein a first valve is disposed at a liquid outlet of the upper space, a third valve is disposed at a liquid outlet of the lower space, a second valve is disposed at a liquid inlet of the upper space, and a fourth valve is disposed at a liquid inlet of the lower space.
3. The core triaxial test apparatus according to claim 1, wherein the top end of the upper plunger is connected to a displacement sensor a for applying axial pressure to the core and measuring axial displacement in real time.
4. The triaxial core testing apparatus according to claim 1, wherein the second space is connected to the pump B through a liquid inlet pipe II, and a sixth valve and a displacement sensor B are disposed on the pipe connected to the second space.
5. The core triaxial test apparatus according to claim 4, wherein the displacement sensor B is disposed at a junction of the fluid pipe controlling the confining pressure and the pressure chamber where the sixth valve is located.
6. The triaxial core testing apparatus according to claim 4, wherein the liquid inlet pipe I and the liquid inlet pipe II are communicated through a pipeline, and a fifth valve is arranged on the communicated pipeline.
7. The triaxial core testing apparatus according to claim 1, wherein the lower plunger rod body is provided with external threads, and the portion of the pressure bin matched with the lower plunger rod body is provided with internal threads, and the lower plunger rod body is manually rotated to detach and mount the core to be tested, so that the core to be tested is fed into the pressure bin and fixed.
8. The core triaxial test apparatus according to claim 1, wherein the pump a and the pump B are connected to the reservoir, and an eighth valve and a seventh valve are respectively disposed at an inlet and an outlet of the pump a; a tenth valve and a ninth valve are respectively arranged at the inlet and the outlet of the pump B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710111621.0A CN106644742B (en) | 2017-02-28 | 2017-02-28 | Triaxial test device for rock core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710111621.0A CN106644742B (en) | 2017-02-28 | 2017-02-28 | Triaxial test device for rock core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106644742A CN106644742A (en) | 2017-05-10 |
| CN106644742B true CN106644742B (en) | 2023-05-26 |
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