Device and method for testing potential in rock impact loading process at high temperature

Abstract

The invention belongs to the field of mines, and particularly relates to a potential testing device and method in the rock impact loading process at high temperature, the potential testing device comprises a testing bin, a high-temperature simulation assembly, a potential collecting assembly and an impact loading assembly, a rock sample is clamped in the testing bin, and the impact loading assembly is connected with the two ends of the rock sample; the potential acquisition assembly is in contact with the two ends of the rock sample, the high-temperature simulation assembly surrounds the rock sample and comprises a heating bin and a heating assembly, the heating bin is located in the test bin and surrounds the rock sample, and the heating assembly is arranged in the heating bin; the potential acquisition assembly and the impact loading assembly penetrate through the side wall of the heating bin and are connected with the rock sample. The device can monitor the potential change in the impact loading process of the rock sample in a high-temperature state, accurately reflect the internal structure and the deformation state of the rock sample, effectively monitor the deformation and damage process, and avoid safety accidents.

Description

Technical Field

[0001] The invention belongs to the field of mining, and in particular relates to a device and method for testing potential of rock impact loading process under high temperature. Background Art

[0002] As the depth of mining continues to increase, the complex geological environment seriously threatens the stable development of underground projects, which are generally affected by impact loads such as earthquakes, mining disturbances, and blasting. In recent years, with the use of geophysical testing methods, a large number of tests and studies have been conducted on the deformation and fracture process of rock masses under different loading modes. Studies have shown that the unstable destruction of rocks often produces free charges and significant potential signals on the surface of the rock mass. By capturing abnormal potential fluctuations, the stress state and damage of the rock can be characterized in real time, reflecting its internal structure and deformation state, and realizing effective monitoring of the deformation and destruction process to avoid safety accidents.

[0003] At present, the research on test equipment is mostly aimed at quasi-static loading experiments, which use a test cylinder, a potential collector, a vacuum pump, a high-pressure gas cylinder and a loading mechanism. The test sample is placed in the test cylinder, the test cylinder is evacuated by a vacuum pump, and then gas is filled into the test cylinder through a high-pressure gas cylinder. Then, pressure is applied to the sample through the loading mechanism, and finally the potential data at both ends of the sample are collected through the potential collector. However, this test device does not take into account the potential response characteristics of rock under high temperature-impact coupling. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a potential testing device and method for rock impact loading process under high temperature, which can monitor the characteristic law of potential signal when rock samples are destroyed under high temperature-impact state, so as to characterize the internal structure characteristics of the rock.

[0005] The technical solution of the present invention includes a test chamber, a high-temperature simulation component, a potential collection component and an impact loading component. The rock sample is clamped inside the test chamber. The impact loading component is connected to both ends of the rock sample to provide impact force to the rock sample. The potential collection component contacts both ends of the rock sample to detect the potential signal when the rock sample is impacted. The high-temperature simulation component surrounds the rock sample and is used to simulate a high-temperature environment. The high-temperature simulation component includes a heating chamber and a heating component. The heating chamber is located inside the test chamber and surrounds the rock sample. The heating component is arranged in the heating chamber and is used to heat the inside of the heating chamber. The potential collection component and the impact loading component are both connected to the rock sample through the side wall of the heating chamber.

[0006] Furthermore, the heating assembly includes a temperature controller and a heating rod. The heating rod is arranged inside the heating chamber, and the temperature controller is arranged outside the test chamber. The temperature controller is connected to the heating rod to control the heating rod to heat the inside of the heating chamber.

[0007] Furthermore, the heating component also includes a temperature sensor, which is arranged inside the heating chamber and is used to detect the temperature inside the heating chamber. The temperature sensor is connected to the temperature controller.

[0008] Furthermore, a thermal insulation layer is provided outside the heating chamber, and the thermal insulation layer surrounds the heating chamber to keep the heating chamber warm.

[0009] Furthermore, a shielding layer is provided on the inner wall of the heating chamber to prevent external electromagnetic interference from affecting the electric charge on the rock sample.

[0010] Furthermore, the impact loading assembly includes an incident rod, a transmission rod and an impact loading device. One end of the incident rod and one end of the transmission rod respectively pass through two opposite side walls of the heating chamber to contact two ends of the rock sample. The other end of the transmission rod is fixed to the test chamber. The impact loading device is located outside the heating chamber. The impact loading device provides an impact force to the other end of the incident rod so that the incident rod and the transmission rod squeeze the rock sample against each other.

[0011] Furthermore, the impact loading assembly also includes two insulating layers, which are respectively located on the opposite end faces of the incident rod and the transmission rod, and the two insulating layers prevent the incident rod and the transmission rod from generating electrical signal interference to the rock sample during testing.

[0012] Furthermore, the potential collection component includes two electrode sheets and a potential collection instrument. The two electrode sheets are respectively located at two ends of the rock sample, and the potential collection instrument is located outside the test chamber. Both electrode sheets are connected to the potential collection instrument through a first wire.

[0013] Furthermore, the potential collection component also includes a front-end amplifier for amplifying the potential signal, and the front-end amplifier is arranged between the two electrode sheets and the potential collection instrument.

[0014] The present invention also provides a method for testing the potential of a rock during impact loading at high temperature, comprising the following steps:

[0015] S100: The rock sample is clamped inside the test chamber, and the impact loading component and the potential collection component are passed through the side wall of the heating chamber to contact the two ends of the rock sample;

[0016] S200: heating the heating chamber by means of a heating assembly so that the interior of the heating chamber reaches a preset temperature and is maintained for 0.5 to 2 hours so that the temperature of the rock sample is consistent with the internal temperature of the heating chamber;

[0017] S300: firstly, the potential collector component is turned on to continuously collect and store voltage signals at both ends of the rock sample, and then the rock sample is impacted by the impact loading component;

[0018] S400: The test ends.

[0019] The technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0020] The present invention surrounds the rock sample by a high-temperature simulation component to simulate a high-temperature environment, then provides an impact force to the rock sample by an impact loading component, and detects a potential signal when the rock sample is impacted by a potential acquisition component, thereby simulating the potential change of the rock sample when it is impacted in a high-temperature environment, and characterizing the characteristic law of the potential signal when the rock sample is destroyed in real time, characterizing the internal structural characteristics of the rock, effectively monitoring the deformation and destruction process, and avoiding safety accidents.

[0021] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the structure of a potential testing device according to one embodiment of the present invention;

[0024] Figure 2 for Figure 1 Sectional view of the AA section.

[0025] Reference numerals:

[0026] 1. Test bench; 2. Test chamber; 3. Incident rod; 4. Transmission rod; 5. Heating chamber; 6. Insulation layer; 7. Rock sample; 8. Electrode sheet; 9. Potential collector; 10. Front-end amplifier; 11. First conductor; 12. Temperature controller; 13. Second conductor; 14. Insulation layer; 141. Bracket; 15. Shielding layer; 16. Slide rail; 17. Impact loading device. DETAILED DESCRIPTION

[0027] A specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation.

[0028] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the technical solutions of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the embodiments of the present invention, unless otherwise specified, “plurality” means two or more.

[0030] like Figure 1 and Figure 2 As shown, the present invention provides a potential testing device for rock impact loading process under high temperature, comprising a test chamber 2, a high temperature simulation component, a potential collection component and an impact loading component. A rock sample 7 is clamped inside the test chamber 2. The impact loading component is connected to both ends of the rock sample 7 to provide impact force to the rock sample 7. The potential collection component contacts both ends of the rock sample 7 to detect the potential signal when the rock sample 7 is impacted. The high temperature simulation component surrounds the rock sample 7 to simulate a high temperature environment. The high temperature simulation component comprises a heating chamber 5 and a heating component. The heating chamber 5 is located inside the test chamber 2 and surrounds the rock sample 7. The heating component is arranged in the heating chamber 5 to heat the inside of the heating chamber 5. Both the potential collection component and the impact loading component are connected to the rock sample 7 through the side wall of the heating chamber 5.

[0031] The present invention surrounds the rock sample 7 through a high-temperature simulation component to simulate a high-temperature environment, then provides an impact force to the rock sample 7 through an impact loading component, and detects the potential signal of the rock sample 7 when it is impacted through a potential acquisition component, thereby simulating the potential change of the rock sample 7 when it is impacted in a high-temperature environment, and characterizing the characteristic law of the potential signal when the rock sample 7 is destroyed in real time, effectively monitoring the deformation and destruction process, and avoiding safety accidents. Especially in the complex geological environment where the mining depth of the mine is continuously increasing and facing the complex disasters of high temperature and impact, this technology is particularly important and can provide strong technical support for the safe and stable development of underground engineering.

[0032] Optionally, a slide rail 16 is provided between the test bench 1 and the test chamber 2 to facilitate the movement of the test chamber 2 during installation, thereby facilitating the overall installation of the potential testing device.

[0033] In the embodiment provided by the present invention, the heating assembly includes a temperature controller 12 and a heating rod. The heating rod is arranged inside the heating chamber 5, and the temperature controller 12 is arranged outside the test chamber 2. The temperature controller 12 is connected to the heating rod to control the heating rod to heat the inside of the heating chamber 5.

[0034] It can be understood that the function of the temperature controller 12 is to control the heating rod to heat the heating chamber 5 to form a high-temperature environment, thereby heating the rock sample 7 in the high-temperature environment.

[0035] Furthermore, the temperature controller 12 is located outside the test chamber, and the temperature controller 12 is connected to the heating rod via a second wire 13 , and the second wire 13 passes through the side walls of the test chamber 2 and the heating chamber 5 in sequence.

[0036] It should be noted that the second wire 13 is a high temperature resistant wire to prevent the second wire 13 from being damaged by a high temperature environment and causing leakage.

[0037] In the embodiment provided by the present invention, the heating component also includes a temperature sensor, which is arranged inside the heating chamber 5 and is used to detect the temperature inside the heating chamber 5. The temperature sensor is connected to the temperature controller 12.

[0038] It can be understood that the temperature sensor detects the temperature inside the heating chamber 5 and feeds it back to the temperature controller 12. The temperature controller 12 can adjust the temperature inside the heating chamber 5 in time to avoid the temperature being higher or lower than the test temperature, thereby ensuring the accuracy of the test structure.

[0039] In the embodiment provided by the present invention, a thermal insulation layer 14 is provided outside the heating chamber 5 , and the thermal insulation layer 14 surrounds the heating chamber 5 to keep the heating chamber 5 warm.

[0040] It can be understood that the thermal insulation layer 14 is fixed inside the test chamber by the bracket 141 and wraps the heating chamber 5 to prevent the temperature inside the heating chamber 5 from being lost.

[0041] In the embodiment provided by the present invention, a shielding layer 15 is provided on the inner wall of the heating chamber 5 to prevent external electromagnetic interference from affecting the electric charge on the rock sample 7 .

[0042] Furthermore, the shielding layer 15 is at least one layer of copper mesh. The specific number of copper mesh layers or the thickness of the shielding layer 15 can be set by those skilled in the art according to their needs, and the present invention does not limit this.

[0043] In the embodiment provided by the present invention, the impact loading assembly includes an incident rod 3, a transmission rod 4 and an impact loading device 17. One end of the incident rod 3 and one end of the transmission rod 4 respectively pass through two opposite side walls of the heating chamber 5 to contact the two ends of the rock sample 7. The other end of the transmission rod 4 is fixed to the test chamber 2. The impact loading device 17 is located outside the heating chamber 5. The impact loading device 17 provides an impact force to the other end of the incident rod 3 so that the incident rod 3 and the transmission rod 4 squeeze the rock sample 7 against each other.

[0044] It can be understood that the incident rod 3 and the transmission rod 4 can also support the rock sample 7 without other clamping structures, thus simplifying the structure.

[0045] It can be understood that when the transmission rod 4 is fixed to the test chamber 2 and the impact loading device 17 provides impact force to the incident rod 3, it can ensure that the incident rod 3 and the transmission rod 4 squeeze the rock sample 7 against each other, avoiding the situation that the transmission rod 4 is not fixed and cannot effectively squeeze the rock sample.

[0046] In the embodiment provided by the present invention, the impact loading assembly also includes two insulating layers 6, which are respectively located on the opposite end faces of the incident rod 3 and the transmission rod 4. The two insulating layers 6 prevent the incident rod 3 and the transmission rod 4 from generating electrical signal interference to the rock sample 7 during testing.

[0047] It can be understood that the insulation layer 6 isolates the electrical signal interference of the incident rod 3 and the transmission rod 4 on the rock sample 7, thereby removing factors affecting the potential signal of the rock sample 7 as much as possible and improving the accuracy of the measurement result.

[0048] In the embodiment provided by the present invention, the potential collection component includes two electrode sheets 8 and a potential collection instrument 9. The two electrode sheets 8 are respectively located at the two ends of the rock sample 7. The potential collection instrument 9 is located outside the test chamber 2. The two electrode sheets 8 are connected to the potential collection instrument 9 through a first wire 11.

[0049] It should be noted that the second wire 13 is a high temperature resistant wire to prevent the second wire 13 from being damaged by a high temperature environment and causing leakage.

[0050] It can be understood that the potential collection component collects the voltage signals at both ends of the rock sample 7 through two electrode sheets 8, and reflects the internal structure and deformation state of the rock by measuring the change in the potential in the rock sample 7, thereby realizing effective monitoring of the rock deformation and destruction process.

[0051] Furthermore, in the embodiment provided by the present invention, the potential collection component also includes a front-end amplifier 10 for amplifying the potential signal. The front-end amplifier 10 is arranged between the two electrode sheets 8 and the potential collection instrument 9 .

[0052] It should be noted that the front-end amplifier 10 belongs to the prior art, and the present invention will not elaborate on the specific structure in detail.

[0053] It can be understood that the voltage difference generated when the rock sample 7 is impacted is relatively low, and the voltage difference needs to be amplified, so the front-end amplifier 10 is provided to amplify the voltage signal.

[0054] The present invention also provides a method for testing the potential of a rock during impact loading at high temperature, comprising the following steps:

[0055] S100: The rock sample 7 is clamped inside the test chamber 2 , and the impact loading assembly and the potential collection assembly are passed through the side wall of the heating chamber 5 to contact the two ends of the rock sample 7 .

[0056] After the test device is assembled and tested, the rock sample 7 is clamped in the heating chamber 5 through the incident rod 3 and the transmission rod 4, and two electrode sheets 8 are respectively placed at both ends of the rock sample 7 and connected to the signal potential collector 9.

[0057] S200: heating the heating chamber 5 by means of the heating assembly, so that the interior of the heating chamber 5 reaches a preset temperature, and maintaining the temperature for 1 hour to 1 hour, so that the temperature of the rock sample 7 is consistent with the internal temperature of the heating chamber 5;

[0058] That is, the heating rod is controlled by the temperature controller 12 to heat the heating chamber 5, so that the rock sample 7 is kept between ℃ and ℃ for . hours to hours, so that the rock sample 7 is fully heated;

[0059] S300: After the rock sample 7 is heated, the potential acquisition component is first turned on to continuously acquire and store voltage signals at both ends of the rock sample 7, and then the rock sample 7 is impacted by the impact loading component;

[0060] That is, the potential collector 9 collects voltage information at both ends of the rock sample 7 through the two electrode sheets 8, and when the impact loading device 17 provides impact force to the incident rod 3, it can ensure that the incident rod 3 and the transmission rod 4 squeeze the rock sample 7 against each other.

[0061] S400: After the test is finished, the temperature controller 12 controls the heating rod to stop heating the heating chamber 5, and turns off the potential collector 9 and the impact loading assembly. After the heating chamber 5 cools down, the rock sample 7 is taken out and retained, and finally the test device is dismantled.

[0062] It should be noted that the impact loading device 17 belongs to the prior art and will not be elaborated in detail in the present invention.

[0063] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0064] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A device for testing the potential of rock impact loading process at high temperature, characterized in that: The invention comprises a test chamber (2), a high temperature simulation component, a potential collection component and an impact loading component. A rock sample (7) is clamped inside the test chamber (2). The impact loading component is connected to both ends of the rock sample (7) to provide an impact force to the rock sample (7). The potential collection component is in contact with both ends of the rock sample (7) to detect a potential signal when the rock sample (7) is impacted. The high temperature simulation component surrounds the rock sample (7) and is used to simulate a high temperature environment. The high temperature simulation component comprises a heating chamber (5) and a heating component. The heating chamber (5) is located inside the test chamber (2) and surrounds the rock sample (7). The heating component is arranged inside the heating chamber (5) and is used to heat the inside of the heating chamber (5). The potential collection component and the impact loading component are both connected to the rock sample (7) through the side wall of the heating chamber (5).

2. A device for testing potential of rock impact loading process under high temperature as claimed in claim 1, characterized in that: The heating assembly comprises a temperature controller (12) and a heating rod; The heating rod is arranged inside the heating chamber (5), and the temperature controller (12) is arranged outside the test chamber (2). The temperature controller (12) is connected to the heating rod to control the heating rod to heat the inside of the heating chamber (5).

3. A device for testing potential of rock impact loading process under high temperature as claimed in claim 2, characterized in that: The heating component further comprises a temperature sensor, which is arranged inside the heating chamber (5) and is used to detect the temperature inside the heating chamber (5); The temperature sensor is connected to the temperature controller (12).

4. The device for testing the potential of rock impact loading process under high temperature as claimed in claim 1, characterized in that: A temperature insulating layer (14) is provided outside the heating chamber (5), and the temperature insulating layer (14) surrounds the heating chamber (5) to keep the heating chamber (5) warm.

5. A device for testing potential of rock impact loading process under high temperature as claimed in claim 4, characterized in that: A shielding layer (15) is provided on the inner wall of the heating chamber (5) to prevent external electromagnetic interference with the electric charge on the rock sample (7).

6. The device for testing the potential of rock impact loading process under high temperature as claimed in claim 1, characterized in that: The impact loading assembly comprises an incident rod (3), a transmission rod (4) and an impact loading device (17); The incident rod (3) and the transmission rod (4) respectively pass through two opposite side walls of the heating chamber (5) to contact the two ends of the rock sample (7); the other end of the transmission rod (4) is fixed to the test chamber (2); the impact loading device (17) is located outside the heating chamber (5); the impact loading device (17) provides an impact force to the other end of the incident rod (3) so that the incident rod (3) and the transmission rod (4) press the rock sample (7) against each other.

7. A device for testing potential of rock impact loading process under high temperature as claimed in claim 6, characterized in that: The impact loading assembly further comprises two insulating layers (6), the two insulating layers (6) being respectively located on opposite end faces of the incident rod (3) and the transmission rod (4), and the two insulating layers (6) preventing the incident rod (3) and the transmission rod (4) from generating electrical signal interference to the rock sample (7) during testing.

8. The device for testing the potential of rock impact loading process under high temperature as claimed in claim 1, characterized in that: The potential collection component comprises two electrode sheets (8) and a potential collection instrument (9); The two electrode sheets (8) are respectively located at two ends of the rock sample (7), the potential collector (9) is located outside the test chamber (2), and the two electrode sheets (8) are connected to the potential collector (9) via a first wire (11).

9. A device for testing potential of rock impact loading process under high temperature as claimed in claim 8, characterized in that: The potential acquisition component also includes a front-end amplifier (10) for amplifying the potential signal; The front-end amplifier (10) is arranged between the two electrode sheets (8) and the potential collector (9).

10. The testing method of a potential testing device for rock impact loading process under high temperature according to any one of claims 1 to 9, characterized in that: The following steps are involved: S100: clamping the rock sample (7) inside the test chamber (2), and the impact loading component and the potential collection component both pass through the side wall of the heating chamber (5) to contact the two ends of the rock sample (7); S200: heating the heating chamber (5) by means of the heating component so that the interior of the heating chamber (5) reaches a preset temperature and is maintained for 0.5 to 2 hours so that the temperature of the rock sample (7) is consistent with the internal temperature of the heating chamber (5); S300: First, the potential collector (9) component is turned on to continuously collect and store voltage signals at both ends of the rock sample (7), and then the rock sample (7) is impacted by the impact loading component.

Images