CN210690243U - Rapid test system for core resistivity and wave velocity under loading state - Google Patents
Rapid test system for core resistivity and wave velocity under loading state Download PDFInfo
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- CN210690243U CN210690243U CN201921472874.1U CN201921472874U CN210690243U CN 210690243 U CN210690243 U CN 210690243U CN 201921472874 U CN201921472874 U CN 201921472874U CN 210690243 U CN210690243 U CN 210690243U
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Abstract
The utility model discloses a quick test system of rock core resistivity and wave speed under loading state, this system includes rock core, electrode plate group, wire, base, axial compression loading device, resistivity test module, sound wave probe, probe connecting wire, wave speed test module, data transmission line, computer; the rock core is arranged between the base and the axial compression loading device; the electrode plate, the lead, the resistivity testing module, the data transmission line and the computing mechanism form a resistivity testing system; the sound wave probe, the probe connecting wire, the wave speed testing module, the data transmission line and the computing mechanism form a wave speed testing system. Adopt the utility model discloses test system can make the measured value more approach to the true value that rock was in the stratigraphic environment among the rock mass excavation process, has more referential meaning. The utility model discloses carry out resistivity and wave speed's quick, accurate test to the core under the pressurization state, carry out the many parameter test simultaneously, can follow the change of multi-angle record core physical quantity.
Description
Technical Field
The utility model relates to a geology, fields such as probing core test, concretely relates to quick test system of core resistivity and wave speed under loading state.
Background
In recent years, with the rapid development of urban construction, demands for shallow underground spaces and deep mineral resources are increasing. Many engineering geological problems are inevitable in the engineering construction process, and the quick and effective acquisition of the physical and mechanical properties of the rock is an indispensable prerequisite for solving the problems. Therefore, how to rapidly and accurately acquire the physical and mechanical parameters of the drill core is very important.
Resistivity and wave speed are two important petrophysical mechanical parameters.
The resistivity is a basic physical parameter of the rock, directly reflects the quality of the conductivity of the rock, and is constant when the internal structure of the rock is stable. When the rock is fractured under the action of external force, the internal structure changes, and the resistivity of the rock also changes. Therefore, the resistivity change condition can reflect the development of the internal fracture of the rock core, and the internal destruction state of the rock can be obtained. However, in the core resistivity test, how to adopt the scientific and effective electrode layout is a great difficulty.
In the process of transmitting sound waves in the rock core, the sound waves interact with the rock core medium, the rock core medium can generate certain influence on the wave speed, and the sound waves can carry information such as the physical and mechanical properties of the rock core under the action. The physical and mechanical parameters of the rock can be calculated according to the elastic wave theory by measuring the longitudinal and transverse wave speeds of the rock in a loading state, so that the complete period process of the rock core damage can be obtained. However, most of the existing core wave velocity testing methods are completed without stress on the core, the high ground stress environment of a rock reservoir cannot be simulated, and the wave velocity change response characteristics of the rock when fracturing damage occurs cannot be collected, so that the wave velocity testing under a static state is less helpful to actual engineering construction.
Generally speaking, most of the traditional rock core physical and mechanical testing methods have the following problems that ① existing testing methods are mostly carried out under normal pressure, the consideration of the high ground stress environment of the rock is lacked, ② cannot carry out multi-parameter testing, the inherent properties of the rock core cannot be described from multiple angles by obtaining single rock physical and mechanical parameters, and ③ common testing methods are long in time consumption, consume a large amount of manpower and material resources and cannot achieve the purpose of rapid testing.
Therefore, it is an urgent need to solve the problems of the prior art to overcome the drawbacks of the prior art and to develop a system for rapidly and accurately testing the resistivity and the wave velocity of the core under the loading state.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a quick test system of core resistivity and wave velocity under the loading state.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
on one hand, the utility model provides a rapid test system for the resistivity and wave velocity of a rock core under a loading state, which comprises the rock core, an electrode plate group, a lead, a base, an axial pressure loading device, a resistivity test module, a sound wave probe, a probe connecting wire, a wave velocity test module, a data transmission line and a computer, wherein,
the rock core is arranged between the base and the axial compression loading device;
the electrode plate group comprises a plurality of electrode plates, and the electrode plates are all fixed on the surface of the rock core and are linearly arranged along the axial direction of the rock core; each electrode plate is respectively connected with a resistivity test module through a lead, and the resistivity test module is connected with a computer through a data transmission line; the electrode plate, the lead, the resistivity testing module, the data transmission line and the computing mechanism form a resistivity testing system;
the sound wave probe comprises a sound wave excitation probe and at least two sound wave receiving probes, and the sound wave excitation probe and the sound wave receiving probes are fixed on the surface of the rock core and are arranged at symmetrical positions on the surface of the rock core; the sound wave excitation probe and the sound wave receiving probe are respectively connected with the wave velocity testing module through probe connecting wires, and the wave velocity testing module is connected with a computer through a data transmission line; the sound wave speed testing system comprises a sound wave excitation probe, a sound wave receiving probe, a probe connecting wire, a wave speed testing module, a data transmission wire and a computing mechanism.
The utility model provides an electrode slice and sonic probe adopt simple, effectual the mode of laying to fix on the surface of rock core, under the prerequisite of accurate test, still integrated rock core resistivity test system and wave speed test system together, can carry out resistivity and wave speed's quick test to the rock core under the pressurized state simultaneously, have saved test time, have improved efficiency of software testing.
The utility model discloses a multistage loading mode of axial compression catches the change of core resistivity and wave speed in dynamic change, makes the test result have more referential meaning.
The utility model discloses can many parameter gather, observe the inside deformation of rock core from many angles and destroy response characteristic.
On the basis of the technical scheme, the utility model discloses still can make following improvement:
preferably, an insulating gasket is arranged between the base, the axial compression loading device and two end faces of the rock core, so that the safety of the system is improved.
Preferably, the electrode plate is arc-shaped, and the outer surface of the electrode plate needs to be polished, so that the electrode plate is prevented from having an oxide layer on the surface and influencing measurement.
Preferably, the electrode plate is fixed on the surface of the rock core through conductive glue.
Preferably, vaseline is applied to the joints of the acoustic wave excitation probe and the acoustic wave receiving probe with the surface of the rock core to enhance coupling.
Preferably, the sound wave excitation probe is located the position that the core is close to the tip, and the sound wave receiving probe is located the one side of keeping away from the sound wave excitation probe on the core and a plurality of sound wave receiving probes are the axial direction range setting of certain interval along the core.
The utility model discloses the wave speed test adopts the transmission mode that one swashs many receipts, can obtain the deformation destruction condition at the different positions of core, makes the test result more accurate, has more referential meaning.
Preferably, the electrode plates are linearly arranged at equal intervals along the axial direction of the rock core.
Preferably, the resistivity testing module is mainly composed of an electrical method, such as a parallel electrical method.
Preferably, the wave speed testing module is mainly composed of a wave speed tester.
On the other hand, the utility model also provides a quick test method of core resistivity and wave speed under the loading state, including following step:
the core is placed between the base and the axial compression loading device by using the testing system; during testing, the axial pressure loading device provides axial pressure for the core, and the core is loaded in a grading manner; before loading, respectively acquiring background values of the electrical resistivity and the wave velocity of a core through an electrical resistivity test system and a wave velocity test system; and after each stage of loading is finished, rapidly testing the resistivity and the wave velocity of the rock core by the resistivity testing system and the wave velocity testing system at the same time, and loading the pressure of the next stage until the rock core is damaged.
Further, when testing the resistivity of the rock core, the testing of the resistivity of the rock core under a loading state is completed by changing the sequence of the power supply electrode and the measuring electrode; through multi-stage loading, a core resistivity profile corresponding to each stage of loading can be obtained, and the core resistivity profile under different axial pressures can be obtained after the loading is carried out until the core is completely damaged;
comparing and analyzing the resistivity profiles of the rock cores under different axial pressures, setting monitoring points for areas with large resistivity changes, extracting the resistivity values of the monitoring points, obtaining an axial pressure P-rock core resistivity rho curve graph by utilizing origin software, and obtaining the resistivity change response characteristics of the rock cores under different axial pressures by analyzing the axial pressure P-rock core resistivity rho curve.
Further, during the core wave velocity test, the core wave velocity test under the loading state is completed by adopting a one-shot multi-shot transmission mode; through multi-stage loading, a core wave velocity value corresponding to each stage of loading can be obtained, and as a plurality of sound wave receiving probes are arranged, a plurality of groups of wave velocity values can be obtained after each stage of loading, and a plurality of groups of axial pressure P-wave velocity v curve graphs are obtained by utilizing origin software;
through the comparative analysis of a plurality of groups of axial pressure P-wave velocity v curves under the same axial pressure, the deformation damage conditions of different parts of the rock core can be obtained; by analyzing the axial pressure P-wave velocity v curve obtained by testing the same sound wave receiving probe, the core wave velocity change response characteristics under different axial pressures can be obtained.
Furthermore, the resistivity test system adopts a Wennar quadrupole method, and comprises a power supply electrode A pole and a power supply electrode B pole, and a measuring electrode M pole and a measuring electrode N pole, wherein the resistivity calculation formula is as follows:
wherein AM represents the distance between the electrode A and the electrode M, AN represents the distance between the electrode A and the electrode N, BM represents the distance between the electrode B and the electrode M, BN represents the distance between the electrode B and the electrode N, △ UMNRepresents the potential difference between the electrode M and the electrode N; i denotes the supply current strength.
Further, the formula for calculating the wave velocity v is:
wherein l represents a linear distance between the acoustic wave excitation probe and the acoustic wave reception probe; t is t1Representing the moment when the head wave enters the core; t is t2Representing the moment when the head wave leaves the core.
Compared with the prior art, the utility model relates to a quick test system and method of rock core resistivity and wave speed under loading state has following beneficial effect:
(1) the wave velocity and the resistivity of the rock core under axial compression can be dynamically changed in real time, so that the measuring value can be closer to the real value of the rock in the stratum environment in the rock excavating process by adopting the testing system and the method, and the method has more referential significance;
(2) the utility model discloses carry out resistivity and wave speed's quick, accurate test to the core under the pressurized state simultaneously, carry out many parameter tests simultaneously, can follow the change of many angle recording core physical quantity.
(3) The utility model discloses the test process weak point consuming time, accurate, high-efficient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a diagram of the shape and layout of electrode plates in the present invention;
FIG. 2 is a diagram showing the layout of the sound wave probe according to the present invention;
FIG. 3 is a schematic diagram of a core resistivity test system connection;
FIG. 4 is a schematic diagram of a core wave velocity test system connection;
FIG. 5 is a simple flow chart of the layout and testing method of the rapid test system for core resistivity and wave velocity under a loading state of the present invention;
wherein, in the figure,
1-a core; 2-electrode slice; 3-a wire; 4-an insulating spacer; 5-a base; 6-axial compression loading device; 7-resistivity test module; 8-acoustic wave excitation probe; 9-a sound wave receiving probe; 10-probe connecting wire; 11-wave speed testing module; 12-a data transmission line; 13-computer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1:
as shown in fig. 1-5, the embodiment of the present invention discloses a rapid test system for core resistivity and wave velocity under a loading state, which comprises a core 1, an electrode sheet set, a lead 3, a base 5, an axial pressure loading device 6, a resistivity test module 7, a sound wave probe, a probe connecting wire 10, a wave velocity test module 11, a data transmission line 12, and a computer 13, wherein,
the core 1 is preferably a columnar structure and the core 1 is placed between the base 5 and the axial compression loading device 6, the axial compression loading device 6 can provide axial pressure for the core 1.
The electrode plate group comprises a plurality of electrode plates 2, in the embodiment, six electrode plates 2 are arranged, and the six electrode plates 2 are all fixed on the surface of the rock core 1 and are linearly arranged along the axial direction of the rock core 1; each electrode plate 2 is respectively connected with a resistivity test module 7 through a wire 3, and the resistivity test module 7 is connected with a computer 13 through a data transmission line 12; the electrode slice 2, the lead 3, the resistivity testing module 7, the data transmission line 12 and the computer 13 form a resistivity testing system.
The acoustic wave probe comprises an acoustic wave excitation probe 8 and at least two acoustic wave receiving probes 9, in the embodiment, the two acoustic wave receiving probes 9 are arranged, the acoustic wave excitation probe 8 and the two acoustic wave receiving probes 9 are both fixed on the surface of the rock core 1 and are arranged at symmetrical positions on the surface of the rock core 1, namely, the embodiment adopts a transmission mode of one excitation and two receiving; the sound wave excitation probe 8 and the sound wave receiving probe 9 are respectively connected with a wave velocity testing module 11 through probe connecting wires 10, and the wave velocity testing module 11 is connected with a computer 13 through a data transmission line 12; the sound wave excitation probe 8, the sound wave receiving probe 9, the probe connecting wire 10, the wave velocity testing module 11, the data transmission line 12 and the computer 13 form a wave velocity testing system.
In order to further optimize the above embodiment, insulating spacers 4 are arranged between the base 5, the axial pressure loading device 6 and the two end faces of the core 1.
In order to further optimize the above embodiment, the electrode sheet 2 is arc-shaped, and the outer surface thereof needs to be polished to remove the surface oxide layer.
In order to further optimize the above embodiment, the electrode plate 2 is fixed on the surface of the core 1 by conductive glue, and air bubbles between the electrode plate 2 and the core 1 should be avoided in the gluing process.
In order to further optimize the above embodiment, vaseline capable of enhancing the coupling effect is coated on the joints of the acoustic wave excitation probe 8 and the acoustic wave receiving probe 9 and the surface of the core 1.
In order to further optimize the above embodiment, the acoustic wave excitation probe 8 is located at a position close to the end of the core 1, the acoustic wave receiving probe 9 is located at a side of the core 1 far from the acoustic wave excitation probe 8, and the two acoustic wave receiving probes 9 are arranged at a certain interval along the axial direction of the core 1.
In order to further optimize the above embodiment, six electrode sheets 2 are linearly arranged at equal intervals in the axial direction of the core 1.
To further optimize the above embodiment, the resistivity test module 7 is constituted by an electrical meter.
In order to further optimize the above embodiment, the wave speed testing module 11 is constituted by a wave speed tester.
Example 2:
as shown in fig. 1-5, the embodiment of the utility model also discloses a quick test method of core resistivity and wave velocity under the loading state, specifically includes the following steps:
firstly, the core 1 is placed between the base 5 and the axial compression loading device 6 by using the test system in the embodiment 1; during testing, the axial pressure loading device 6 provides axial pressure for the core 1, and the axial pressure loading of the core 1 adopts a graded pressurization mode;
before loading, respectively acquiring background values of the electrical resistivity and the wave velocity of a core through an electrical resistivity test system and a wave velocity test system; and then after each stage of loading is finished, rapidly testing the resistivity and the wave velocity of the rock core by a resistivity testing system and a wave velocity testing system at the same time, and loading the pressure of the next stage until the rock core 1 is damaged.
In other words, before loading, the resistivity test system and the wave velocity test system are used for respectively acquiring background values of the core resistivity and the wave velocity; and then carrying out first-stage axial pressure loading, completing the loading to collect the resistivity and the wave velocity of the rock core, carrying out next-stage axial pressure loading and data collection if the rock core 1 is not damaged, and stopping the loading to carry out related data processing and analysis if the rock core 1 is damaged.
When testing the electrical resistivity of the rock core, the electrical resistivity testing system completes the testing of the electrical resistivity of the rock core under a loading state by changing the sequence of the power supply electrode and the measuring electrode, specifically, the electrical resistivity testing module in the electrical resistivity testing system adopts a Wennan quadrupole method, the electrical resistivity testing system comprises a power supply electrode A pole and a power supply electrode B pole, a measuring electrode M pole and a measuring electrode N pole, and the calculation formula of the electrical resistivity is as follows:
wherein AM represents the distance between the electrode A and the electrode M, AN represents the distance between the electrode A and the electrode N, BM represents the distance between the electrode B and the electrode M, BN represents the distance between the electrode B and the electrode N, △ UMNRepresents the potential difference between the electrode M and the electrode N; i represents the intensity of the supply current;
through multi-stage loading, a core resistivity profile corresponding to each stage of loading can be obtained, the core resistivity profile under different axial pressures can be obtained after the loading is carried out until the core is completely damaged, and the deformation damage part of the core under the axial pressure loading can be obtained through analysis;
comparing and analyzing the resistivity profile of the rock core under different axial pressures, setting monitoring points for an area with large resistivity change, wherein the number of the monitoring points is determined according to specific conditions, extracting the resistivity values of the monitoring points, obtaining an axial pressure P-rock core resistivity rho curve by utilizing or igin software, and analyzing the axial pressure P-rock core resistivity rho curve to further obtain the resistivity change response characteristics of the rock core under different axial pressures.
When the core wave velocity is tested, the core wave velocity is tested in a loading state by adopting a one-drive two-receive transmission mode, and specifically, the calculation formula of the wave velocity v is as follows:
wherein l represents a linear distance between the acoustic wave excitation probe and the acoustic wave reception probe; t is t1Representing the moment when the head wave enters the core; t is t2Representing the moment when the head wave leaves the core;
the principle of the test is that the sound wave excitation probe 8 and the sound wave receiving probe 9 are symmetrically arranged on the surface of the rock core 1, a high-frequency pulse signal is generated in the wave velocity tester, the signal is excited into an ultrasonic signal through the sound wave excitation probe 8, then the ultrasonic signal is conducted inside the rock core 1, then the ultrasonic signal is received through the sound wave receiving probe 9, the travel time of the ultrasonic wave in the rock core 1 is recorded, the distance between the sound wave excitation probe 8 and the sound wave receiving probe 9 is measured, and the ratio of the distance to the travel time is the wave velocity of the rock core 1.
Through multi-stage loading, a core wave velocity value corresponding to each stage of loading can be obtained, and the core wave velocity values under different axial pressures can be obtained after the core 1 is loaded to be completely damaged; because two sound wave receiving probes 9 are arranged, two groups of wave velocity values can be obtained after each stage of loading, and two groups of axial pressure P-wave velocity v curve graphs are obtained by utilizing origin software;
in view of the fact that when the internal structure of the core 1 is intact, the change of the core wave velocity value is not large; when the core 1 is deformed and damaged, the wave velocity obtained by testing can be greatly changed;
therefore, the deformation damage conditions of different parts of the rock core 1 can be obtained by comparing and analyzing two groups of axial pressure P-wave velocity v curves under the same axial pressure; by analyzing the axial pressure P-wave velocity v curve obtained by testing the same sound wave receiving probe 9, the core wave velocity change response characteristics under different axial pressures can be obtained.
Claims (9)
1. A rapid test system for the resistivity and wave velocity of a rock core under a loading state is characterized by comprising the rock core, an electrode plate group, a lead, a base, a shaft pressure loading device, a resistivity test module, an acoustic probe, a probe connecting wire, a wave velocity test module, a data transmission line and a computer, wherein,
the rock core is arranged between the base and the axial compression loading device;
the electrode plate group comprises a plurality of electrode plates, and the electrode plates are all fixed on the surface of the rock core and are linearly arranged along the axial direction of the rock core; each electrode plate is respectively connected with a resistivity test module through a lead, and the resistivity test module is connected with a computer through a data transmission line; the electrode plate, the lead, the resistivity testing module, the data transmission line and the computing mechanism form a resistivity testing system;
the sound wave probe comprises a sound wave excitation probe and at least two sound wave receiving probes, and the sound wave excitation probe and the sound wave receiving probes are fixed on the surface of the rock core and are arranged at symmetrical positions on the surface of the rock core; the sound wave excitation probe and the sound wave receiving probe are respectively connected with the wave velocity testing module through probe connecting wires, and the wave velocity testing module is connected with a computer through a data transmission line; the sound wave speed testing system comprises a sound wave excitation probe, a sound wave receiving probe, a probe connecting wire, a wave speed testing module, a data transmission wire and a computing mechanism.
2. The system for rapidly testing the resistivity and the wave velocity of the core under the loading state of claim 1, wherein an insulating gasket is arranged between the base, the axial compression loading device and the two end faces of the core.
3. The system of claim 1, wherein the electrode sheet is arcuate and has no surface oxide layer on its outer surface after being polished.
4. The system of claim 1, wherein the electrode pads are secured to the surface of the core by conductive glue.
5. The system for rapidly testing the resistivity and the wave speed of the rock core under the loading state of claim 1, wherein vaseline is coated on the joints of the sound wave excitation probe, the sound wave receiving probe and the surface of the rock core.
6. The system for rapidly testing the resistivity and the wave velocity of the rock core under the loading state according to claim 1 or 5, wherein the sound wave excitation probe is positioned at a position close to the end part of the rock core, the sound wave receiving probe is positioned at a side of the rock core far away from the sound wave excitation probe, and the sound wave receiving probes are arranged at a certain interval along the axial direction of the rock core.
7. The system for rapidly testing the resistivity and the wave velocity of the rock core under the loading state according to claim 1, wherein the electrode plates are linearly arranged at equal intervals along the axial direction of the rock core.
8. The system of claim 1, wherein the resistivity testing module comprises an electrical meter.
9. The system of claim 1, wherein the wave velocity testing module comprises a wave velocity tester.
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| CN110487635A (en) * | 2019-09-05 | 2019-11-22 | 安徽理工大学 | The fast testing system and method for core resistivity and velocity of wave under a kind of stress state |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110487635A (en) * | 2019-09-05 | 2019-11-22 | 安徽理工大学 | The fast testing system and method for core resistivity and velocity of wave under a kind of stress state |
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