CN101813588A - Pressure head device for loading normal triaxial rheology and testing acoustic emission under high confining pressure - Google Patents
Pressure head device for loading normal triaxial rheology and testing acoustic emission under high confining pressure Download PDFInfo
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Abstract
The invention discloses a pressure head device for loading normal triaxial rheology and testing acoustic emission under high confining pressure. Vaseline is applied on a piezoelectric ceramic surface of a sensor, the sensor is placed into a sensor room and fixed at the bottom, a flexible spacer is placed between the sensor and a fastening bolt, the fastening bolt, a side seal ring and a side seal cover are installed in a side seal chamber through a slot of the fastening bolt, a sticky steel type structural adhesive is poured into a recess part and an outlet hole of the side seal cover, a main seal ring is arranged into a seal groove, a main seal cover and a pressure head seat body are sealed through the bolt of the main seal cover, a storehouse seal ring and a storehouse seal cover are installed in a storehouse seal chamber, a lower pressure head centering guide slot centers the center of a testing system pressure axis, an upper pressure head is arranged on a rock sample, and coaxial cables of the upper pressure head and the lower pressure head are linked through convex-concave joints of coaxial cable yarns. The invention is widely used for indoor emission tests of failure mechanisms, failure modes and damage evolution rules of soft and hard rocks in the rheology process.
Description
Technical field
The invention belongs to rock mechanics experiment and sound emission monitoring technology field, more specifically relate to a kind of indenter device that not only can carry out under confined pressure normal triaxial rheology test but also can monitor rock burst characteristics of Acoustic Emission in the rheology process of the test.This device can be widely used in the indoor normal triaxial rheology test of rock of Mineral Engineering, Hydraulic and Hydro-Power Engineering, petroleum engineering, Geotechnical Engineering and underground works.
Background technology
Rock material under external force, its inner new crackle produces, in the old crack propagation process, the transient state of strain energy discharges and the generation elastic wave, promptly send acoustic emission information, different size, multi-form micro rupture, the acoustic emission signal that rock mass discharged is strong and weak to be different with feature, by catching the acoustic emission information that the rock micro rupture produces, can the damage evolution rule of systematic study rock material when stress is adjusted, the omen rule of damage mechanism and rock burst is for the understanding of rock engineering disaster mechanism and research provide a kind of new monitoring means and analytical approach.
Rock single shaft acoustic emission Experiments of Machanics are vast scholar's research systems the most, achievement in research is the abundantest, Tu Chu acoustic emission Experiments of Machanics the most, generally the square rock sample that rock sample is processed as 50 * 50 * 100mm when carrying out this test, on the side of square rock sample, test effect is better sensors coupled; Also have the part scholar to use diameter 50mm, the circular specimen of high 100mm on the Up/down base of pilot system, because the distance of sensor distance rock sample is far away, is added the decay between the medium to transducer arrangements, and the acoustic emission signal of survey is not very desirable.
Acoustic Emission of Rock mechanical test in normal triaxial, the true triaxial chamber, because oil pressure exists in the pressure storehouse, there is big difficulty in the sensor protection, and therefore, most achievements in research all are the achievements under the low confined pressure, achievement in research under the part high confining pressure, mainly be by transducer arrangements being recorded on the Up/down base of pilot system,, adding the decay between the medium because the distance of sensor distance rock sample is far away, acoustic emission signal is undesirable, and test findings is also had a greatly reduced quality.
Normal triaxial rheology acoustic emission rock mechanics experiment is extremely important for the analysis and the research of deep-buried rock engineering long-time stability under the high confining pressure, but research for high confining pressure normal triaxial rheology acoustic emission rock mechanics experiment, do not see the pertinent literature report as yet, the main cause rheological test is a long mechanical test, under the long-term high confining pressure, 1) sensor is difficult to protection, and the sensor piezoelectric ceramics is very easily damaged by oil pressure; When 2) the sensor coaxial wire is drawn, be prone to oil leakage phenomenon, cause triaxial rheology acoustic emission test failure; 3) because easily generation stress is concentrated between the embedding pressure head of sensor and the rock sample, cause end effect very obvious, test findings is undesirable.
Summary of the invention
The objective of the invention is to be to provide a kind of high confining pressure normal triaxial rheology to load and the acoustic emission test indenter device, solve the problems referred to above and deficiency that existing method exists, further improve the effect that sensor receives rock micro rupture signal, improve the reliability of the preceding characteristics of Acoustic Emission law-analysing of the rock failure mechanism of rock.Apparatus of the present invention can be protected under the high confining pressure oil pressure well to the damage of calibrate AE sensor, and have avoided the stress between indenter device and the rock sample to concentrate preferably, guarantee that test can carry out smoothly, and sensor can monitor more effective acoustic emission signals.This device can be widely used in indoor (or on-the-spot) experimental study of soft or hard rock failure mechanism in the rheology process, failure mode and damage evolution rule, also is with a wide range of applications for fields such as Tunnel Engineering, Hydraulic and Hydro-Power Engineering, exploitation of oil-gas field, mining engineering, nuclear waste disposals simultaneously.
To achieve these goals, the present invention adopts following technical measures:
In order to solve the problem in the normal triaxial rheology acoustic emission test under the high confining pressure, the high confining pressure normal triaxial rheology loads and the acoustic emission test indenter device is exactly in order to address the above problem, normal triaxial rheology loading and acoustic emission test indenter device under a kind of high confining pressure have been designed, this device has not only solved sensor preferably and has been difficult to protection, piezoelectric ceramics is easily damaged by oil pressure, when coaxial wire is drawn, be prone to problems such as leakage of oil, and avoided preferably because the embedding of sensor causes easily producing between pressure head and the rock sample problem that stress is concentrated.Use the normal triaxial rheology acoustic emission test of this pressure head, can monitor the micro rupture acoustic emission signal of rock in the rheological test process preferably, can estimate damage evolution and energy release rule before the rock failure mechanism of rock effectively, for rock engineering disaster alarm and evaluation provide theoretical foundation.
Normal triaxial rheology loads and the acoustic emission test indenter device under a kind of high confining pressure, this device comprises rheological test pressure head pedestal, primary seal lid, primary seal circle, side seal lid, side seal circle, fastening bolt, warehouse gland bonnet, warehouse O-ring seal and flexible pad etc. up and down, its annexation is: smear skim vaseline on sensor piezoelectric ceramics surface, put it into transducer room and coupling bottom it, situation by disconnected lead test test coupling, if coupling is good, then be fixed in transducer room bottom and inboard with 703 colloids; The BNC coaxial wire is drawn transducer room by outlet hole slot and wire hole; Then flexible pad is placed between sensor and the fastening bolt, groove by fastening bolt tightens fastening bolt, filling epoxy resin in going out wire casing then, and smear the AB colloid along screw thread it is infiltrated in screw thread, in the gap of fastening bolt and primary seal lid, seal in addition, sensor is sealed in the transducer room with the AB colloid; Then, the BNC coaxial wire is passed side seal circle and side seal lid wire hole, and side seal circle and side seal lid is mounted in the side seal chamber, groove by side seal lid screws the side seal lid makes side seal circle radial deformation reach sealing purpose, to side seal lid can not precession, the recessed pressure head pedestal of side seal this moment lid injects YZJ-1 steel bonding type structure glue slightly in recessed portion and side seal lid wire hole, finish the sealing in side seal chamber; Then, dress primary seal circle places in the seal groove of primary seal lid, four primary seal cap bolts are tightly screwed in the primary seal box nut, seal sensor chamber once more, prevent the infiltration of oil pressure under the high confining pressure, so far having finished under the high confining pressure normal triaxial rheology loads and acoustic emission test seaming chuck Unit Installation (below, be called for short seaming chuck); Same step is finished under the high confining pressure normal triaxial rheology and is loaded installation and sealing with acoustic emission test push-down head device (below, be called for short push-down head); Then, the syv-50-3 coaxial wire is passed warehouse O-ring seal and warehouse gland bonnet wire hole, and warehouse O-ring seal and warehouse gland bonnet be mounted in the warehouse annular seal space, screwing the warehouse gland bonnet by warehouse gland bonnet groove makes warehouse O-ring seal radial deformation reach sealing purpose, to the warehouse gland bonnet can not precession, the recessed pressure storehouse of warehouse gland bonnet this moment warehouse slightly, in recessed portion and warehouse gland bonnet wire hole, inject YZJ-2 steel bonding type structure glue, finish the installation and the sealing of warehouse annular seal space.At last, the center with push-down head centering guide groove centering pilot system last item places rock sample on the push-down head, then seaming chuck is placed on the rock sample, and makes the center of seaming chuck centering guide groove alignment test system last item; At last, with the BNC coaxial wire of last push-down head with the syv-50-3 coaxial wire by the link of coaxial wire convex-concave joint, finish normal triaxial rheology under the high confining pressure and load with the installation of acoustic emission test indenter device, seal and be connected.
The present invention compared with prior art has the following advantages and effect:
1) the present invention has solved preferably under the high confining pressure that sensor is difficult to protection in the normal triaxial rheology acoustic emission rock mechanics experiment, piezoelectric ceramics is easily damaged by oil pressure, when coaxial wire is drawn, be prone to problems such as leakage of oil, and avoided preferably because the embedding of sensor causes easily producing between pressure head and the rock sample problem that stress is concentrated;
What 2) normal triaxial rheology acoustic emission rock mechanics experiment became under the high confining pressure that makes of the invention of this device is feasible, and the test effect is more satisfactory, as shown in figure 12;
3) this device also can carry out normal triaxial acoustic emission Experiments of Machanics under the high oil pressure in addition, has solved present system and can only hang down test under the confined pressure, and high confining pressure is test down, the dissatisfactory problem of acoustic emission monitor(ing) effect.Normal triaxial acoustic emission Experiments of Machanics under the high oil pressure of tradition, can only be on the Up/down base of pilot system with transducer arrangements, acoustic emission system only just can monitor the part acoustic emission signal when rock sample takes place to destroy, as shown in figure 13, the acoustic emission monitor(ing) effect is undesirable.
Description of drawings
Fig. 1 loads and the acoustic emission test indenter device pressure storehouse one-piece construction sectional view of packing into for the high confining pressure normal triaxial rheology;
Fig. 2 is that a kind of high confining pressure normal triaxial rheology loads and acoustic emission test indenter device pedestal sectional view;
Fig. 3 is that a kind of high confining pressure normal triaxial rheology loads and acoustic emission test indenter device pedestal vertical view;
Fig. 4 is a kind of primary seal lid sectional view;
Fig. 5 is a kind of primary seal lid vertical view;
Fig. 6 is a kind of fastening bolt sectional view;
Fig. 7 is a kind of fastening bolt vertical view;
Fig. 8 is a kind of side seal lid sectional view;
Fig. 9 is a kind of side seal lid right view;
Figure 10 is a kind of warehouse gland bonnet sectional view;
Figure 11 is a kind of warehouse gland bonnet right view.
Figure 12 is a kind of use acoustic emission Experiments of Machanics of the present invention design sketchs
Figure 13 is a kind of transducer arrangements sound emission signal characteristic figure in the rock sample mechanical test process when Up/down base.
Wherein, 1-pressure head pedestal, 2-R6a sensor, the 3-fastening bolt, the groove of 4-fastening bolt, 5-primary seal circle, 6-primary seal cap bolt, 7-primary seal lid, 8-centering guide groove, 9-E44 type epoxy resin, 10-wire hole, 11-side seal circle, 12-side seal lid, 13-YZJ-1 steel bonding type structure glue, 14-BNC coaxial wire, the flexible pad of 15-, 16-rock sample, 17-coaxial wire convex-concave joint, 18-warehouse O-ring seal, 19-YZJ-2 steel bonding type structure glue, 20-syv-50-3 coaxial wire, 21-warehouse gland bonnet, 22-pressure storehouse, 23-pressure storehouse warehouse, the 24-transducer room, 25-primary seal box nut, 26-goes out wire casing, 27-primary seal groove, 28-side seal lid groove, 29-side seal chamber, 30-side seal lid wire hole, 31-warehouse gland bonnet groove.
Embodiment
A kind of high confining pressure normal triaxial rheology loads and the acoustic emission test indenter device, and it comprises pressure head pedestal 1, R6a sensor 2, fastening bolt 3, the groove 4 of fastening bolt, primary seal circle 5, primary seal cap bolt 6, primary seal lid 7, centering guide groove 8, E44 type epoxy resin 9, wire hole 10, side seal circle 11, side seal lid 12, YZJ-1 steel bonding type structure glue 13, BNC coaxial wire 14, flexible pad 15, rock sample 16, coaxial wire convex-concave joint 17, warehouse O-ring seal 18, YZJ-2 steel bonding type structure glue 19, syv-50-3 coaxial wire 20, warehouse gland bonnet 21, pressure storehouse 22, pressure storehouse warehouse 23, transducer room 24, primary seal box nut 25, go out wire casing 26, primary seal groove 27, side seal lid groove 28, side seal chamber 29, side seal lid wire hole 30, warehouse gland bonnet groove 31.
With the dirty change of voice emission test of Jinping hydropower station high confining pressure is example, the specific embodiment of the present invention is described: smear skim vaseline on R6a sensor 2 piezoelectric ceramics surfaces, R6a sensor 2 is put into transducer room 24 and coupling bottom it, situation by disconnected lead test test coupling, if coupling is good, then R6a sensor 2 is fixed on transducer room 24 bottoms and inboard thereof with 703 colloids; BNC coaxial wire 14 is drawn transducer room 24 by outlet hole slot 26 and wire hole 10; Then flexible pad 15 is placed between R6a sensor 2 and the fastening bolt 3, groove 4 by fastening bolt tightens fastening bolt 3, filling epoxy resin 9 in going out wire casing 26 then, and smear the AB colloid along screw thread it is infiltrated in screw thread, in the gap of fastening bolt 3 and primary seal lid 7, seal in addition, R6a sensor 2 is sealed in the transducer room 24 with the AB colloid; Then, BNC coaxial wire 14 is passed side seal circle 11 and side seal lid wire hole 30, and side seal circle 11 and side seal lid 12 is mounted in the side seal chamber 29, groove 28 by side seal lid screws side seal lid 12 makes side seal circle 11 radial deformations reach sealing purpose, to side seal lid 12 can not precession, side seal this moment lid 12 recessed pressure head pedestals 1 inject YZJ-2 steel bonding type structure glue 19 slightly in recessed portion and side seal lid wire hole 30, finish the sealing in side seal chamber 29; Then, dress primary seal circle 5 places in the seal groove 27 of primary seal lid 7, four primary seal cap bolts 6 are tightly screwed in the primary seal box nut 25, the seal sensor chamber 24 once more, prevent the infiltration of oil pressure under the high confining pressure, so far having finished under the high confining pressure normal triaxial rheology loads and produces transmission test seaming chuck Unit Installation (below, be called for short seaming chuck); Same step is finished under the high confining pressure normal triaxial rheology and is loaded installation and sealing with acoustic emission test push-down head device (below, be called for short push-down head); Then, syv-50-3 coaxial wire 20 is passed warehouse O-ring seal 18 and warehouse gland bonnet wire hole 10, and warehouse O-ring seal 18 and warehouse gland bonnet 21 be mounted in the warehouse annular seal space, screwing warehouse gland bonnet 21 by warehouse gland bonnet groove 31 makes warehouse O-ring seal 18 radial deformations reach sealing purpose, to warehouse gland bonnet 21 can not precession, warehouse gland bonnet 21 recessed pressure storehouse warehouses 23 slightly at this moment, in recessed portion and warehouse gland bonnet wire hole 10, inject YZJ-1 steel bonding type structure glue 13, finish the installation and the sealing of warehouse annular seal space.At last, the center with push-down head centering guide groove 8 centering pilot system last items places rock sample 16 on the push-down head, then seaming chuck is placed on the rock sample 16, and makes the center of seaming chuck centering guide groove 8 alignment test system last items, and put into pressure storehouse 22; At last, the BNC coaxial wire 14 of last push-down head is linked by coaxial wire convex-concave joint 17 with syv-50-3 coaxial wire 20, finishing normal triaxial rheology under the high confining pressure loads with the installation of acoustic emission test indenter device, seals and be connected, with oil body charged pressure storehouse 22, finish the installation of total system.
Claims (6)
1. a high confining pressure normal triaxial rheology loads and the acoustic emission test indenter device, it comprises R6a sensor (2), primary seal lid (7), centering guide groove (8), side seal lid (12), YZJ-1 steel bonding type structure glue (13), BNC coaxial wire (14), flexible pad (15), warehouse O-ring seal (18), warehouse gland bonnet (21), transducer room (24), go out wire casing (26), primary seal groove (27), side seal lid groove (28), warehouse gland bonnet groove (31), it is characterized in that: smear skim vaseline on R6a sensor (2) piezoelectric ceramics surface, R6a sensor (2) is put into transducer room (24) and coupling bottom it, R6a sensor (2) is fixed on transducer room (24) bottom inside with 703 colloids; BNC coaxial wire (14) is drawn transducer room (24) by outlet hole slot (26) and wire hole (10); Then flexible pad (15) is placed between R6a sensor (2) and the fastening bolt (3), groove (4) by fastening bolt is with fastening bolt (3), side seal circle (11) and side seal lid (12) are mounted in the side seal chamber (29), in recessed portion and side seal lid wire hole (30), inject YZJ-2 steel bonding type structure glue (19), primary seal circle (5) places in the seal groove (27) of primary seal lid (7), four primary seal cap bolts (6) are screwed in the primary seal box nut, seal sensor chamber (24), syv-50-3 coaxial wire (20) is passed warehouse O-ring seal (18) and warehouse gland bonnet wire hole (10), warehouse O-ring seal (18) and warehouse gland bonnet (21) are mounted in the warehouse annular seal space, center with push-down head centering guide groove (8) centering pilot system last item, rock sample (16) is placed on the push-down head, seaming chuck is placed on the rock sample (16), make the center of seaming chuck centering guide groove (8) alignment test system last item, with the BNC coaxial wire (14) of last push-down head with syv-50-3 coaxial wire (20) by coaxial wire convex-concave joint (17) link, finish normal triaxial rheology under the high confining pressure and load installation with the acoustic emission test indenter device, the sealing and be connected.
2. a kind of high confining pressure normal triaxial rheology according to claim 1 loads and the acoustic emission test indenter device, it is characterized in that: describedly go out interior the filling epoxy resin of wire casing (26) (9), and smear the AB colloid along screw thread and make in its infiltration screw thread.
3. a kind of high confining pressure normal triaxial rheology according to claim 1 loads and the acoustic emission test indenter device, it is characterized in that: with the sealing of AB colloid, R6a sensor (2) is sealed in the transducer room (24) in the gap of described fastening bolt (3) and primary seal lid (7).
4. a kind of high confining pressure normal triaxial rheology according to claim 1 loads and the acoustic emission test indenter device, it is characterized in that: inject YZJ-2 steel bonding type structure glue (19) in described recessed portion and the warehouse gland bonnet wire hole (10).
5. a kind of high confining pressure normal triaxial rheology according to claim 1 loads and the acoustic emission test indenter device, it is characterized in that: described side seal lid (12) is recessed into pressure head pedestal (1), and seals with YZJ-1 steel bonding type structure glue (13).
6. a kind of high confining pressure normal triaxial rheology according to claim 1 loads and the acoustic emission test indenter device, it is characterized in that: the primary seal circle (25) of described primary seal lid (12) the primary seal groove (27) of packing into screws in gland bonnet nut (25) by primary seal cap bolt (6) and primary seal lid (7) is connected with pressure head pedestal (1) and seals.
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| CN2010101492537A CN101813588B (en) | 2010-04-13 | 2010-04-13 | Pressure head device for loading normal triaxial rheology and testing acoustic emission under high confining pressure |
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| CN102866065A (en) * | 2012-09-10 | 2013-01-09 | 中国科学院半导体研究所 | Continuous pressurizing device |
| CN103048187A (en) * | 2012-12-21 | 2013-04-17 | 中国矿业大学 | Fixing device for acoustic emission sensor used in rock triaxial test under confining pressure condition |
| CN103149081A (en) * | 2013-02-01 | 2013-06-12 | 中国科学院武汉岩土力学研究所 | Squeeze head used for rock conventional triaxial test acoustic emission test |
| CN103278385A (en) * | 2013-05-17 | 2013-09-04 | 中国科学院武汉岩土力学研究所 | Testing device for rock collapse breakdown strength |
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| CN102866065B (en) * | 2012-09-10 | 2014-07-30 | 中国科学院半导体研究所 | Continuous pressurizing device |
| CN103048187A (en) * | 2012-12-21 | 2013-04-17 | 中国矿业大学 | Fixing device for acoustic emission sensor used in rock triaxial test under confining pressure condition |
| CN103149081B (en) * | 2013-02-01 | 2015-01-07 | 中国科学院武汉岩土力学研究所 | Squeeze head used for rock conventional triaxial test acoustic emission test |
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