CN103994928A - Mechanics-acoustics combined testing method in orientated rock extrusion fracture process - Google Patents
Mechanics-acoustics combined testing method in orientated rock extrusion fracture process Download PDFInfo
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- CN103994928A CN103994928A CN201410236260.9A CN201410236260A CN103994928A CN 103994928 A CN103994928 A CN 103994928A CN 201410236260 A CN201410236260 A CN 201410236260A CN 103994928 A CN103994928 A CN 103994928A
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- 239000011435 rock Substances 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012360 testing method Methods 0.000 title claims abstract description 27
- 230000008569 process Effects 0.000 title claims abstract description 25
- 238000001125 extrusion Methods 0.000 title claims abstract description 21
- 239000000523 sample Substances 0.000 claims abstract description 80
- 238000002604 ultrasonography Methods 0.000 claims description 20
- 150000001875 compounds Chemical class 0.000 claims description 13
- 239000011888 foil Substances 0.000 claims description 13
- 238000010998 test method Methods 0.000 claims description 11
- 238000004826 seaming Methods 0.000 claims description 10
- 238000005336 cracking Methods 0.000 claims description 8
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- -1 poly tetrafluoroethylene Polymers 0.000 claims description 3
- 229940058401 polytetrafluoroethylene Drugs 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000011160 research Methods 0.000 abstract description 3
- 238000007405 data analysis Methods 0.000 abstract 1
- 230000006378 damage Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000003542 behavioural effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010429 evolutionary process Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a mechanics-acoustics combined testing method in orientated rock extrusion fracture process, belonging to the technical field of physical mechanical behavior research in the rock fracture process. The method comprises the following steps: preparing a rock test sample, dividing a stress applying area, pasting a strain gage, fixing an ultrasonic wave probe and an acoustic emission sensor, putting the rock test sample into a pressure machine, additionally arranging a partial loading pressing block between the rock test sample and a pressing head, centering and aligning the partial loading pressing block to the stress applying area, starting the pressure machine for applying the stress in a gradient manner, acquiring data signals through the acoustic emission sensor, the ultrasonic wave probe and the strain gage, stopping stress applying till the rock test sample has orientated macro cracks, and extracting the testing data for data analysis. By adopting a partial orientated applying mode, the formation of a macro crack side is manually controlled, the phenomena of the generation of multiple macro crack sides and intersected combination of macro cracks are effectively avoided, and further, the study on the physical mechanical behavior in the rock extrusion fracture process is possible.
Description
Technical field
The invention belongs to the physical mechanics behavioral study technical field of rock fracture process, particularly relate to the mechanics acoustics joint test method of the directed extrusion fracture process of a kind of rock.
Background technology
The physical mechanics behavior of study of rocks fracture process, all has a very important role to the inverting of the mechanism research of the prediction of earthquake, earthquake and rock frame stress field.
Present stage, under laboratory environment, carry out the physical and mechanical experiment of rock extrusion fracture, be a kind of means as the physical mechanics behavior of person skilled study of rocks fracture process.
Person skilled has been carried out the ess-strain mechanical test that rock compressed breaks under single shaft and three axle conditions, but the compound phenomenon of intersection that always there will be the macroscopical fissure-plane of many groups and macroscopic cracking in experimentation, this has brought great inconvenience to the analysis of experimental result, and rock extrusion fracture phenomenon cannot be well described.
Because rock is in extrusion fracture process, often be accompanied by acoustic emission phenomenon, research shows, the acoustic signal sending in rock extrusion fracture process can be explained the physical mechanics behavior of rock fracture process well, therefore person skilled has been determined two kinds of main acoustic testing methods, comprise acoustic emission detection method and supersonic testing method, by acoustic emission detection method, can understand the damage evolutionary process of rock, by supersonic testing method, can well characterize interior change and the degree of injury of rock.
But, also do not have at present a kind of effective method mechanical test and acoustical testing gang can be tested simultaneously, and realize and in test process, avoid the appearance of the macroscopical fissure-plane of many groups and macroscopic cracking to intersect the generation of compound phenomenon, want the physical mechanics behavior in further study of rocks extrusion fracture process, existing measuring technology temporarily also cannot meet this target.
Summary of the invention
The problem existing for prior art, the invention provides the mechanics acoustics joint test method of the directed extrusion fracture process of a kind of rock, the mode loading by local orientation, the formation of manual control macroscopic view fissure-plane, effectively avoids the generation of the macroscopical fissure-plane of many groups and macroscopic cracking to intersect the generation of compound phenomenon; When carrying out mechanical test, synchronously realize acoustical testing, for the physical mechanics behavior in further study of rocks extrusion fracture process provides possibility.
To achieve these goals, the present invention adopts following technical scheme: the mechanics acoustics joint test method of the directed extrusion fracture process of a kind of rock, comprises the steps:
Step 1: prepare rock sample, the length of rock sample, height, wide dimension scale are 3:2:1;
Step 2: mark respectively stress loading district on two long * wide end surfaces of rock sample, stress loading district is positioned at length * wide end surface center;
Step 3: paste foil gauge on long * high end face of rock sample;
Step 4: mounting ultrasonic probe on two high * wide end surfaces of rock sample, comprise ultrasound wave transmitting probe and ultrasound wave receiving transducer, ultrasound wave transmitting probe is positioned at a high * wide end surface center, and ultrasound wave receiving transducer is positioned at another height * wide end surface center;
Step 5: fixed sound emission sensor on the length * high end face of rock sample;
Step 6: rock sample is placed between the seaming chuck and push-down head of rock pressure machine, between rock sample and seaming chuck, install upper end local loading briquetting additional, between rock sample and push-down head, install lower end local loading briquetting additional, upper end local loading briquetting, lower end local loading briquetting simultaneously with the stress loading district align center of the length * wide end surface of rock sample;
Step 7: start rock pressure machine, rock sample is carried out to staged stress loading; Meanwhile, by calibrate AE sensor, acoustic emission signal is carried out to continuous Real-time Collection, by ultrasonic probe, gather ultrasonic signal, by foil gauge, gather strain signal, until directed macroscopic cracking appears in rock sample, loading stops;
Step 8: extract test data, and the test data of obtaining is analyzed.
Between described ultrasound wave transmitting probe, ultrasound wave receiving transducer and rock sample, by couplant, be coupled.
Described upper end local loading briquetting, lower end local loading briquetting are stiffness bearer, and its length is half of rock sample length, and its width equates with rock sample.
Between described rock sample and upper end local loading briquetting, lower end local loading briquetting, all added low friction compound, low friction compound adopts poly tetrafluoroethylene or the synthetic low friction compound of stearic acid.
Between described upper end local loading briquetting and seaming chuck, balance bulb is installed.
By described ultrasonic probe, gathering ultrasonic signal need to carry out at stress loading step place, and the every increase one-level of stress loading, just carries out a ultrasonic investigation.
Beneficial effect of the present invention:
The mode that the present invention can load by local orientation, the formation of manual control macroscopic view fissure-plane, effectively avoids the generation of the macroscopical fissure-plane of many groups and macroscopic cracking to intersect the generation of compound phenomenon; When carrying out mechanical test, synchronously realize acoustical testing, for the physical mechanics behavior in further study of rocks extrusion fracture process provides possibility.
Accompanying drawing explanation
Fig. 1 is the installment state schematic diagram before rock sample test in embodiment;
Fig. 2 is rock sample stress loading curve map in embodiment;
Fig. 3 is strain and stress in embodiment, ultrasonic velocity, acoustic emission umber of pulse graph of relation;
In figure, 1-rock sample, 2-short grid foil gauge, 3-long grid foil gauge, 4-upper end local loading briquetting, 5-lower end local loading briquetting, 6-balance bulb, 7-ultrasound wave transmitting probe, 8-ultrasound wave receiving transducer, 9-calibrate AE sensor, 10-seaming chuck, 11-push-down head.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The mechanics acoustics joint test method of the described directed extrusion fracture process of rock, comprises the steps:
Step 1: prepare rock sample 1, it is long, high, wide dimension scale is 3:2:1, in the present embodiment, the length of rock sample 1, height, wide 200mm, 100mm, the 50mm of being of a size of, rock sample 1 each end face need to polish processing, makes the Parallel errors of every two parallel end faces be no more than 0.02mm;
Step 2: mark respectively stress loading district on two long * wide (200mm * 50mm) end faces of rock sample 1, stress loading district is positioned at length * wide (200mm * 50mm) end face center;
Step 3: paste foil gauge on long * high (200mm * 100mm) end face for rock sample 1, foil gauge comprises short grid foil gauge 2 and long grid foil gauge 3, short grid foil gauge 2 is for measuring the local train of 1 one of rock samples, and long grid foil gauge 3 is for measuring the mean strain of rock sample 1 integral body;
Step 4: mounting ultrasonic probe on two high * wide (100mm * 50mm) end faces of rock sample 1, comprise ultrasound wave transmitting probe 7 and ultrasound wave receiving transducer 8, ultrasound wave transmitting probe 7 is positioned at high * wide (100mm * 50mm) end face center, and ultrasound wave receiving transducer 8 is positioned at another height * wide (100mm * 50mm) end face center;
Step 5: fixed sound emission sensor 9 on length * height (200mm * 100mm) end face of rock sample 1;
Step 6: rock sample 1 is placed between the seaming chuck 10 and push-down head 11 of rock pressure machine, between rock sample 1 and seaming chuck 10, install upper end local loading briquetting 4 additional, between rock sample 1 and push-down head 11, install lower end local loading briquetting 5 additional, upper end local loading briquetting 4, lower end local loading briquetting 5 simultaneously with the stress loading district align center of length * wide (200mm * 50mm) end face of rock sample 1, as shown in Figure 1;
Step 7: start rock pressure machine, rock sample 1 is carried out to staged stress loading, loading gradient is 20KN, and loading speed is 1KN/s, as shown in Figure 2; Meanwhile, by 9 pairs of acoustic emission signals of calibrate AE sensor, carry out continuous Real-time Collection, by ultrasonic probe, gather ultrasonic signal, by foil gauge, gather strain signal, until directed macroscopic cracking appears in rock sample 1, loading stops;
Step 8: extract test data, and the test data of obtaining is analyzed, draw strain and stress, ultrasonic velocity, acoustic emission umber of pulse graph of relation by test data, specifically as shown in Figure 3.
In order to reduce test error, improve measuring accuracy, between described ultrasound wave transmitting probe 7, ultrasound wave receiving transducer 8 and rock sample 1, by couplant, be coupled.
Described upper end local loading briquetting 4, lower end local loading briquetting 5 are stiffness bearer, and its length is half of rock sample 1 length, and its width equates with rock sample 1, and its effect is the formation of controlling macroscopic cracking.
In order to reduce the friction between rock sample 1 and upper end local loading briquetting 4, lower end local loading briquetting 5, reduce the interference of friction to acoustic emission signal, between described rock sample 1 and upper end local loading briquetting 4, lower end local loading briquetting 5, all added low friction compound, low friction compound adopts poly tetrafluoroethylene or the synthetic low friction compound of stearic acid.
In order to guarantee the stress balance of rock sample 1, between described upper end local loading briquetting 4 and seaming chuck 10, balance bulb 6 is installed.
In order to prevent the phase mutual interference of acoustic emission signal and ultrasonic signal, by described ultrasonic probe, gathering ultrasonic signal need to carry out at stress loading step place, and the every increase one-level of stress loading, just carries out a ultrasonic investigation.
Scheme in embodiment is not in order to limit scope of patent protection of the present invention, and the equivalence that all the present invention of disengaging do is implemented or change, is all contained in the scope of the claims of this case.
Claims (6)
1. a mechanics acoustics joint test method for the directed extrusion fracture process of rock, is characterized in that comprising the steps:
Step 1: prepare rock sample, the length of rock sample, height, wide dimension scale are 3:2:1;
Step 2: mark respectively stress loading district on two long * wide end surfaces of rock sample, stress loading district is positioned at length * wide end surface center;
Step 3: paste foil gauge on long * high end face of rock sample;
Step 4: mounting ultrasonic probe on two high * wide end surfaces of rock sample, comprise ultrasound wave transmitting probe and ultrasound wave receiving transducer, ultrasound wave transmitting probe is positioned at a high * wide end surface center, and ultrasound wave receiving transducer is positioned at another height * wide end surface center;
Step 5: fixed sound emission sensor on the length * high end face of rock sample;
Step 6: rock sample is placed between the seaming chuck and push-down head of rock pressure machine, between rock sample and seaming chuck, install upper end local loading briquetting additional, between rock sample and push-down head, install lower end local loading briquetting additional, upper end local loading briquetting, lower end local loading briquetting simultaneously with the stress loading district align center of the length * wide end surface of rock sample;
Step 7: start rock pressure machine, rock sample is carried out to staged stress loading; Meanwhile, by calibrate AE sensor, acoustic emission signal is carried out to continuous Real-time Collection, by ultrasonic probe, gather ultrasonic signal, by foil gauge, gather strain signal, until directed macroscopic cracking appears in rock sample, loading stops;
Step 8: extract test data, and the test data of obtaining is analyzed.
2. the mechanics acoustics joint test method of the directed extrusion fracture process of a kind of rock according to claim 1, is characterized in that: between described ultrasound wave transmitting probe, ultrasound wave receiving transducer and rock sample, by couplant, be coupled.
3. the mechanics acoustics joint test method of the directed extrusion fracture process of a kind of rock according to claim 1, it is characterized in that: described upper end local loading briquetting, lower end local loading briquetting are stiffness bearer, its length is half of rock sample length, and its width equates with rock sample.
4. the mechanics acoustics joint test method of the directed extrusion fracture process of a kind of rock according to claim 1, it is characterized in that: between described rock sample and upper end local loading briquetting, lower end local loading briquetting, all added low friction compound, low friction compound adopts poly tetrafluoroethylene or the synthetic low friction compound of stearic acid.
5. the mechanics acoustics joint test method of the directed extrusion fracture process of a kind of rock according to claim 1, is characterized in that: between described upper end local loading briquetting and seaming chuck, balance bulb is installed.
6. the mechanics acoustics joint test method of the directed extrusion fracture process of a kind of rock according to claim 1, it is characterized in that: by described ultrasonic probe, gathering ultrasonic signal need to carry out at stress loading step place, be the every increase one-level of stress loading, just carry out a ultrasonic investigation.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107340229A (en) * | 2017-06-22 | 2017-11-10 | 中国矿业大学 | A kind of experimental provision and method for testing coal and rock dynamics |
| CN107664662A (en) * | 2017-10-30 | 2018-02-06 | 西安交通工程学院 | Long range rail failure detector |
| CN107966364A (en) * | 2017-11-20 | 2018-04-27 | 河北工业大学 | A kind of recognition methods of the rock type materials rupture property based on deformation test |
| CN108020269A (en) * | 2018-01-30 | 2018-05-11 | 吉林大学 | A kind of acoustic emission test device detected for axial workpiece bending crack with fracture |
| CN108240942A (en) * | 2016-12-26 | 2018-07-03 | 中国科学院地质与地球物理研究所 | A kind of rock fracture experimental system and experimental method |
| CN108871984A (en) * | 2018-06-08 | 2018-11-23 | 清华大学 | Indentation test device and method based on load and deformation field measurement |
| CN109142045A (en) * | 2017-06-28 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of system and method detecting rock core destruction signals |
| CN110208053A (en) * | 2019-01-25 | 2019-09-06 | 东北大学 | A kind of production of bedded rock thin plate sample and loading method |
| CN111272565A (en) * | 2020-03-10 | 2020-06-12 | 大连理工大学 | Test method for detecting rock mechanical parameters |
| CN112595598A (en) * | 2020-11-24 | 2021-04-02 | 西安科技大学 | Inclined layered coal rock physical strength-sound-light-wave integrated testing device and method |
| CN113514313A (en) * | 2021-04-22 | 2021-10-19 | 中煤科工集团重庆研究院有限公司 | Device and method for preparing mud rock samples in batches |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108240942A (en) * | 2016-12-26 | 2018-07-03 | 中国科学院地质与地球物理研究所 | A kind of rock fracture experimental system and experimental method |
| CN107340229A (en) * | 2017-06-22 | 2017-11-10 | 中国矿业大学 | A kind of experimental provision and method for testing coal and rock dynamics |
| CN109142045A (en) * | 2017-06-28 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of system and method detecting rock core destruction signals |
| CN107664662A (en) * | 2017-10-30 | 2018-02-06 | 西安交通工程学院 | Long range rail failure detector |
| CN107664662B (en) * | 2017-10-30 | 2023-12-22 | 西安交通工程学院 | Long-distance steel rail damage detector |
| CN107966364B (en) * | 2017-11-20 | 2019-12-27 | 河北工业大学 | Rock material fracture property identification method based on deformation test |
| CN107966364A (en) * | 2017-11-20 | 2018-04-27 | 河北工业大学 | A kind of recognition methods of the rock type materials rupture property based on deformation test |
| CN108020269A (en) * | 2018-01-30 | 2018-05-11 | 吉林大学 | A kind of acoustic emission test device detected for axial workpiece bending crack with fracture |
| CN108020269B (en) * | 2018-01-30 | 2023-09-29 | 吉林大学 | Acoustic emission testing device for detecting bending cracks and fractures of shaft parts |
| CN108871984A (en) * | 2018-06-08 | 2018-11-23 | 清华大学 | Indentation test device and method based on load and deformation field measurement |
| CN110208053A (en) * | 2019-01-25 | 2019-09-06 | 东北大学 | A kind of production of bedded rock thin plate sample and loading method |
| CN110208053B (en) * | 2019-01-25 | 2021-05-25 | 东北大学 | Method for manufacturing and loading layered rock sheet sample |
| CN111272565A (en) * | 2020-03-10 | 2020-06-12 | 大连理工大学 | Test method for detecting rock mechanical parameters |
| CN112595598A (en) * | 2020-11-24 | 2021-04-02 | 西安科技大学 | Inclined layered coal rock physical strength-sound-light-wave integrated testing device and method |
| CN113514313A (en) * | 2021-04-22 | 2021-10-19 | 中煤科工集团重庆研究院有限公司 | Device and method for preparing mud rock samples in batches |
| CN113514313B (en) * | 2021-04-22 | 2024-01-26 | 中煤科工集团重庆研究院有限公司 | Device and method for preparing mudstone samples in batches |
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