CN103048187A - Fixing device for acoustic emission sensor used in rock triaxial test under confining pressure condition - Google Patents
Fixing device for acoustic emission sensor used in rock triaxial test under confining pressure condition Download PDFInfo
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- CN103048187A CN103048187A CN2012105610175A CN201210561017A CN103048187A CN 103048187 A CN103048187 A CN 103048187A CN 2012105610175 A CN2012105610175 A CN 2012105610175A CN 201210561017 A CN201210561017 A CN 201210561017A CN 103048187 A CN103048187 A CN 103048187A
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- 239000011435 rock Substances 0.000 title claims abstract description 48
- 238000012360 testing method Methods 0.000 title abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 239000003292 glue Substances 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims description 20
- 238000002474 experimental method Methods 0.000 claims description 12
- 210000004907 gland Anatomy 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract 1
- 238000012669 compression test Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 206010011376 Crepitations Diseases 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
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Abstract
A fixing device for an acoustic emission sensor used in a rock triaxial test under the confining pressure condition is suitable for an indoor acoustic emission test on the rock damage mechanism, damage positioning and accumulation process in conventional rock triaxial and uniaxial compression tests. The fixing device comprises a fixing ring, a pretensioning mechanism and an acoustic emission sensor sealed chamber, wherein the fixing ring is hinged with the pretensioning mechanism through bolts; the acoustic emission sensor sealed chamber comprises a sealed cylinder body with a guide groove and acoustic emission sensors arranged in the sealed cylinder body, and a wire outlet into which a bonding steel structured glue is injected is formed in the side wall of the sealed cylinder body; and the pretensioning mechanism comprises springs and adjusting bolts, through which a plurality of arc-shaped pretensioning steel sheets are connected into a circular ring. The fixing device can effectively protect the acoustic emission sensors and prevent the acoustic emission sensors from damage and destroy under high oil pressure without influencing original measurement equipment, ensures that an acoustic emission monitoring system is always in close contact with a rock sample, remarkably reduces interference signals in the acoustic emission test, and satisfies the acoustic emission test requirement in the rock material damage process.
Description
Technical field
The present invention relates to Under Confining Pressure three axles experiment calibrate AE sensor stationary installation, be particularly useful for to utilize the experiment of acoustic emission signal location rock sample rupture location.
Background technology
Rock material is as a kind of special engineering medium, it can add the unloading effect by the complicated stress of experience in all kinds of Geotechnical Engineerings, when external force reaches certain limit, rock interior will germinate new crackle, loading along with external force, Original Cracks in these new crackles and the rock will produce expansion and connect, and then will cause the Geotechnical Engineering geologic hazard.Thereby the rupture process of study of rocks under effect of stress is to understanding Geotechnical Engineering failure mechanism and guiding construction great significance for design.
Rock is in rupture process, and the strain energy of rupture location is able to abrupt release and produces elastic wave, namely sends acoustic emission information.Acoustic emission signal in the time of can catching rock burst by the calibrate AE sensor that is arranged in diverse location can be determined by inversion algorithm the position of breaking in the rock sample to damage evolutionary process thereby can obtain rock under effect of stress.In Rock Under Uniaxial Compression acoustic compression launch monitor, usually calibrate AE sensor is directly fixed on rock surface by bungee or adhesive tape, because the potsherd of calibrate AE sensor front end is a plane, and rock sample is generally cylindrical, therefore the contact area of sensor and rock sample is very little, when the rock sample distortion is larger, often cause calibrate AE sensor to break away from rock sample, cause the failure of an experiment; In the rock compressed acoustic emission monitor(ing) experiment under the confined pressure condition is arranged, because the effect that the potsherd of calibrate AE sensor front end can not bear pressure, the method that the acoustic current emission sensor is arranged mainly contains two kinds: a kind of is that calibrate AE sensor is arranged in the outer wall that loads cylinder, because influence factor is too much, impact such as pressure head and triaxial chamber hydraulic oil, the signal interfere information that the method detects is more, generally can't satisfy testing requirements; Another kind method is that calibrate AE sensor is placed in the upper push-down head, owing to and also being indirect contact between the rock sample, thereby there is certain interference in signal, simultaneously owing at most two calibrate AE sensors can only be installed, the location that therefore can't realize the rock sample rupture location.Thereby, there is no at present the calibrate AE sensor stationary installation of rock sample acoustic emission information under effective monitoring high confining pressure condition.
Summary of the invention
Technical matters: the objective of the invention is to overcome in the prior art deficiency it, a kind of monitoring Under Confining Pressure triaxial test calibrate AE sensor stationary installation simple in structure, easy to operate, effective is provided.
Technical scheme: Under Confining Pressure three axles experiment calibrate AE sensor stationary installation of the present invention, comprise clamping rings, be located at the pre-tightening mechanism in the clamping rings and be fixed in the pre-tightening mechanism and the contacted a plurality of calibrate AE sensor closed chambers of rock sample, clamping rings is hinged by bolt and pre-tightening mechanism; Described calibrate AE sensor closed chamber comprises the sealed cylinder block that has guide groove, be provided with in the sealed cylinder block along pack into wherein calibrate AE sensor of guide groove, the sealed cylinder block port is provided with gland bonnet, be provided with flexible pad between calibrate AE sensor and the gland bonnet, have the wire hole of interior injection steel bonding type structure glue on the sidewall of sealed cylinder block; Be provided with the coaxial wire that is connected with calibrate AE sensor in the wire hole; Described pre-tightening mechanism comprises a plurality of arc pretension steel discs and a plurality of arc pretension steel discs is linked as the adjusting bolt of annulus, and adjusting bolt is provided with spring; Described calibrate AE sensor closed chamber is bolted on the arc pretension steel disc.
Described gland bonnet is connected by trip bolt with sealed cylinder block, between be provided with O-ring seal; The quantity of described a plurality of arc pretension steel discs is identical with the quantity of a plurality of calibrate AE sensors.
Beneficial effect: efficiency protection calibrate AE sensor of the present invention prevents its damage and fracture under high oil pressure, and can not exert an influence to original measuring equipment (such as axial and hoop displacement measuring device).Can ensure acoustic emission monitoring system all the time with the close contact of rock sample, significantly reduce the undesired signal in the acoustic emission test, satisfy the acoustic emission test requirement of rock material damage process.Have following advantage:
1, emission sensor stationary installation of the present invention is installed facility, and can guarantee that acoustic emission monitoring system is close to rock sample in the whole experimentation, significantly reduces the undesired signal in the acoustic emission test, improves the accuracy of test result.The simultaneously installation of this stationary installation can not exert an influence to existing measurement mechanism (such as axial and hoop measurement mechanism).
2, emission sensor stationary installation of the present invention can effectively be protected the calibrate AE sensor under the high oil pressure effect; not only can carry out the experiment under the single shaft (confined pressure is zero); be particularly useful for than the acoustic emission test under the high confining pressure, can effectively replenish existing Acoustic Emission of Rock monitoring experiment achievement.
3, the accurate installation site of guide sound emission sensor of calibrate AE sensor stationary installation of the present invention is convenient to location algorithm and is accurately located the position that rock sample breaks.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is adjusting bolt of the present invention and spring schematic diagram;
Fig. 3 is emission sensor closed chamber master TV structure figure of the present invention;
Fig. 4 is emission sensor closed chamber plan structure figure of the present invention.
Among the figure: 1-clamping rings, 2-calibrate AE sensor closed chamber, 3-sealed cylinder block, 4-gland bonnet, the 5-trip bolt, 6-O-ring seal, 7-calibrate AE sensor, the 8-guide groove, 9-coaxial wire, 10-wire hole, 11-steel bonding type structure glue, the flexible pad of 12-, 13-arc pretension steel disc, the 14-adjusting bolt, 15-spring, 16-screw, the 17-bolt, 18-bolt hole, 19-rock sample.
Embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are further described:
Shown in Figure 1, Under Confining Pressure three axles experiment calibrate AE sensor stationary installation of the present invention mainly is made of clamping rings 1, a plurality of calibrate AE sensor closed chamber 2 and pre-tightening mechanism.Described pre-tightening mechanism comprises a plurality of arc pretension steel discs 13 and a plurality of arc pretension steel discs 13 is linked as the adjusting bolt 14 of annulus, 13 of a plurality of arc pretension steel discs interconnect by spring 15, by adjusting the length of spring 15 with spring 15 its adjusting bolts that link to each other 14.Calibrate AE sensor closed chamber 2 is fixed on the arc pretension steel disc 13 by the screw hole on the gland bonnet, utilize adjusting bolt 14 regulating springs 15 length that calibrate AE sensor closed chamber 2 is close on the rock sample, pre-tightening mechanism is hinged by bolt 17 and clamping rings 1; Described calibrate AE sensor closed chamber 2 comprises sealed cylinder block 3 and the gland bonnet 4 that has guide groove 8, and gland bonnet 4 is connected by trip bolt 5 with sealed cylinder block 3, between be provided with O-ring seal 6; Have the wire hole 10 of interior injection steel bonding type structure glue 11 on the sidewall of sealed cylinder block 3, be used for the installation of sensor conductor 9; Utilize O-ring seal and steel bonding type structure glue 11 to realize the sealing of closed chamber device, guarantee that calibrate AE sensor 7 does not destroy under the high oil pressure.Calibrate AE sensor closed chamber 2 front portions contact with rock sample 19, and the rear portion is fixed on the arc pretension steel disc 13 by bolt 16 and bolt hole 18; The top end face of described calibrate AE sensor closed chamber 2 is arc surface, can be fitted in well on the column type rock sample; Form annular pre-tightening mechanism by arc pretension steel disc 13 and spring 15, can guarantee that calibrate AE sensor 7 can both be close on the rock sample 19 in the whole process of rock sample deformation failure.Calibrate AE sensor 7 is packed into along guide groove 8 in the sealed cylinder block 3, is provided with flexible pad 12 between calibrate AE sensor 7 and the gland bonnet 4; By wire hole 10, calibrate AE sensor 7 is connected with coaxial wire 9.By the accurate locus of guide sound emission sensor of clamping rings 1, hinged by bolt 17 and pre-pressing structure simultaneously after, in the time of can guaranteeing large displacement to occur behind the rock sample peak, large distortion does not occur in whole calibrate AE sensor stationary installation.
The present invention is to consisting of the preferred following version of parts of Under Confining Pressure three axles experiment calibrate AE sensor stationary installation:
1, calibrate AE sensor closed chamber and rock sample contact interface adopt designed arc-shaped appearance, the curvature of circular arc and the diameter of rock sample coupling, and for the hexahedron rock sample, planar design is adopted in the outer end of calibrate AE sensor closed chamber.
2, the interior spatial structure of calibrate AE sensor closed chamber cylinder body and calibrate AE sensor adapt, and closed chamber cylinder body guide groove can be opened to cylinder base, perhaps slightly are deeper than the position of used sensor terminals.
3, arc pretension steel disc is by on bolted splice and the clamping rings, the position of this bolt on arc pretension steel disc is at 1/3 place of arc pretension steel disc length, make the calibrate AE sensor closed chamber after fixing that certain move place be arranged, when the rock sample failure produced larger displacement, certain compatible deformation can occur and not break away from rock sample in closed chamber.
The course of work: after rock sample 19 installs, show at the piezoelectric ceramics of calibrate AE sensor 7 and to smear vaseline, then it is put into closed cylinder 3 along guide groove 8; Coaxial wire 9 is connect by wire hole 10 and calibrate AE sensor, then in wire hole 10, inject steel bonding type structure glue 11; Flexible pad 12 is placed on the calibrate AE sensor 7, prevents from that calibrate AE sensor 7 from producing to rock in observation process, O-ring seal 6 is placed in the seal groove on sealed cylinder block 3 tops, then by trip bolt 5 that gland bonnet 4 and sealed cylinder block 3 is fixing; Utilize bolt 16 to be fixed on the arc pretension steel disc 13 by the bolt hole 18 on 5 on the gland bonnet calibrate AE sensor closed chamber 2, then utilize adjusting bolt 14 and spring 15 that arc pretension steel disc 13 is tied the composition pre-tightening mechanism, and the pulling force by adjusting bolt 14 regulating springs 15, make calibrate AE sensor closed chamber 2 be close to the rock sample surface; By bolt 17 pre-tightening mechanism and clamping rings 1 are hinged together at last, fine rotation can occur with arc pretension steel disc 13 and be advisable in the tightness of bolt 17.
After having finished the installation of Under Confining Pressure three axles experiment calibrate AE sensor stationary installation, clamping rings 1 is fixed in the triaxial chamber, and coaxial wire 9 is connected with the default conductor interface of testing machine, can carry out the acoustic emission monitor(ing) of the triaxial test process of rock sample.
Claims (3)
1. Under Confining Pressure three axles are tested the calibrate AE sensor stationary installation, it is characterized in that: it comprises clamping rings (1), is located at the interior pre-tightening mechanism of clamping rings (1) and is fixed in the pre-tightening mechanism and the contacted a plurality of calibrate AE sensor closed chambers of rock sample (19) (2), and clamping rings (1) is hinged by bolt (17) and pre-tightening mechanism;
Described calibrate AE sensor closed chamber (2) comprises the sealed cylinder block (3) that has guide groove (8), be provided with in the sealed cylinder block (3) along pack into wherein calibrate AE sensor (7) of guide groove (8), sealed cylinder block (3) port is provided with gland bonnet (4), be provided with flexible pad (12) between calibrate AE sensor (7) and the gland bonnet (4), have the wire hole (10) of interior injection steel bonding type structure glue (11) on the sidewall of sealed cylinder block (3); Be provided with the coaxial wire (9) that is connected with calibrate AE sensor (7) in the wire hole (10);
Described pre-tightening mechanism comprises a plurality of arc pretension steel discs (13) and a plurality of arc pretension steel discs (13) is linked as the adjusting bolt (15) of annulus, and adjusting bolt (14) is provided with spring (15);
Described calibrate AE sensor closed chamber (2) is fixed on the arc pretension steel disc (13) by bolt (16).
2. a kind of Under Confining Pressure three axles according to claim 1 experiment calibrate AE sensor stationary installation, it is characterized in that: described gland bonnet (4) is connected by trip bolt (5) with sealed cylinder block (3), between be provided with O-ring seal (6).
3. a kind of Under Confining Pressure three axles according to claim 1 are tested the calibrate AE sensor stationary installation, and it is characterized in that: the quantity of described a plurality of arc pretension steel discs (13) is identical with the quantity of a plurality of calibrate AE sensors (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210561017.5A CN103048187B (en) | 2012-12-21 | 2012-12-21 | Fixing device for acoustic emission sensor used in rock triaxial test under confining pressure condition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210561017.5A CN103048187B (en) | 2012-12-21 | 2012-12-21 | Fixing device for acoustic emission sensor used in rock triaxial test under confining pressure condition |
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| Publication Number | Publication Date |
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| CN103048187A true CN103048187A (en) | 2013-04-17 |
| CN103048187B CN103048187B (en) | 2014-10-29 |
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| CN201210561017.5A Expired - Fee Related CN103048187B (en) | 2012-12-21 | 2012-12-21 | Fixing device for acoustic emission sensor used in rock triaxial test under confining pressure condition |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103398901A (en) * | 2013-08-08 | 2013-11-20 | 中国科学院武汉岩土力学研究所 | Indoor pull-out test apparatus for anchor rod |
| CN103412054A (en) * | 2013-07-26 | 2013-11-27 | 中国矿业大学 | Sensor fixing test rack for coal rock uniaxial compression acoustic emission test and use method |
| CN103558630A (en) * | 2013-11-22 | 2014-02-05 | 中煤科工集团重庆研究院有限公司 | Method for mounting mine acoustic emission sensor |
| CN107045018A (en) * | 2017-06-23 | 2017-08-15 | 四川大学 | Recovery type scene acoustic emission sensor |
| CN107121697A (en) * | 2017-06-23 | 2017-09-01 | 四川大学 | A kind of rock-burst monitoring acoustic sensor |
| CN107132281A (en) * | 2017-06-23 | 2017-09-05 | 四川大学 | A kind of acoustic emission sensor |
| CN107255460A (en) * | 2017-06-23 | 2017-10-17 | 核工业北京地质研究院 | Spring acoustic emission sensor erecting device |
| CN107727498A (en) * | 2017-09-26 | 2018-02-23 | 北京科技大学 | A kind of Experimental on acoustic emission sensor mounting clamping device and test specimen installation method |
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| CN108152145A (en) * | 2017-11-29 | 2018-06-12 | 中国石油天然气股份有限公司 | Experimental device and method for simulating crack development in high-temperature pyrolysis process of hydrocarbon source rock |
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| JP2008045989A (en) * | 2006-08-15 | 2008-02-28 | Central Res Inst Of Electric Power Ind | Jig for mounting sensor and method for mounting sensor on tubular object |
| KR100820570B1 (en) * | 2006-12-29 | 2008-04-07 | 두산중공업 주식회사 | Multi-scan apparatus having multi-probe holder |
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Cited By (23)
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| CN103412054A (en) * | 2013-07-26 | 2013-11-27 | 中国矿业大学 | Sensor fixing test rack for coal rock uniaxial compression acoustic emission test and use method |
| CN103412054B (en) * | 2013-07-26 | 2015-11-04 | 中国矿业大学 | Sensor fixing test rack for coal rock uniaxial compression acoustic emission test and use method |
| CN103398901A (en) * | 2013-08-08 | 2013-11-20 | 中国科学院武汉岩土力学研究所 | Indoor pull-out test apparatus for anchor rod |
| CN103398901B (en) * | 2013-08-08 | 2015-04-29 | 中国科学院武汉岩土力学研究所 | Indoor pull-out test apparatus for anchor rod |
| CN103558630A (en) * | 2013-11-22 | 2014-02-05 | 中煤科工集团重庆研究院有限公司 | Method for mounting mine acoustic emission sensor |
| CN107121697A (en) * | 2017-06-23 | 2017-09-01 | 四川大学 | A kind of rock-burst monitoring acoustic sensor |
| CN107132281A (en) * | 2017-06-23 | 2017-09-05 | 四川大学 | A kind of acoustic emission sensor |
| CN107255460A (en) * | 2017-06-23 | 2017-10-17 | 核工业北京地质研究院 | Spring acoustic emission sensor erecting device |
| CN107045018A (en) * | 2017-06-23 | 2017-08-15 | 四川大学 | Recovery type scene acoustic emission sensor |
| CN107132281B (en) * | 2017-06-23 | 2020-01-10 | 四川大学 | Acoustic emission sensor |
| CN107045018B (en) * | 2017-06-23 | 2020-01-10 | 四川大学 | Recovery type on-site acoustic emission sensor |
| CN107255460B (en) * | 2017-06-23 | 2019-11-22 | 核工业北京地质研究院 | Spring acoustic emission sensor mounting device |
| CN107727498B (en) * | 2017-09-26 | 2019-11-08 | 北京科技大学 | A kind of Experimental on acoustic emission sensor mounting clamping device and test specimen installation method |
| CN107727498A (en) * | 2017-09-26 | 2018-02-23 | 北京科技大学 | A kind of Experimental on acoustic emission sensor mounting clamping device and test specimen installation method |
| CN108152145A (en) * | 2017-11-29 | 2018-06-12 | 中国石油天然气股份有限公司 | Experimental device and method for simulating crack development in high-temperature pyrolysis process of hydrocarbon source rock |
| CN108007769A (en) * | 2017-12-18 | 2018-05-08 | 北京航空航天大学 | A kind of extremely low modulus composite material high temperature tension test fixture and its test method |
| CN108007769B (en) * | 2017-12-18 | 2020-08-04 | 北京航空航天大学 | Extremely-low-modulus composite material high-temperature tensile test fixture and test method thereof |
| CN108398342A (en) * | 2018-02-28 | 2018-08-14 | 华东交通大学 | The acoustic emission test device and its operating method of a kind of rock mass in high confining pressure unloading |
| CN108398342B (en) * | 2018-02-28 | 2020-05-12 | 华东交通大学 | Acoustic emission testing device for rock mass in high confining pressure unloading and operation method thereof |
| CN109115889A (en) * | 2018-10-16 | 2019-01-01 | 中国矿业大学(北京) | A kind of sensor fastening device and method of coal petrography Brazil splitting Experimental on acoustic emission |
| CN109142536A (en) * | 2018-10-17 | 2019-01-04 | 中南大学 | High-precision rock interior damages real-time locating and detecting device |
| CN109283047A (en) * | 2018-11-29 | 2019-01-29 | 四川大学 | Rock Damage monitoring system and evaluation method under a kind of depth ground engineering-environment |
| CN109283047B (en) * | 2018-11-29 | 2023-10-20 | 四川大学 | Rock mass damage monitoring system and evaluation method in deep engineering environment |
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Granted publication date: 20141029 |