CN103323537B - Coupling device for realizing acquisition of acoustic emission signals in triaxial pressure cell - Google Patents
Coupling device for realizing acquisition of acoustic emission signals in triaxial pressure cell Download PDFInfo
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- CN103323537B CN103323537B CN201310215468.8A CN201310215468A CN103323537B CN 103323537 B CN103323537 B CN 103323537B CN 201310215468 A CN201310215468 A CN 201310215468A CN 103323537 B CN103323537 B CN 103323537B
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Abstract
The invention discloses a coupling device for realizing acquisition of acoustic emission signals in a triaxial pressure cell. A triaxial apparatus pedestal has an L-shaped conduction pipeline, inside which sensor signal lines are arranged. Acoustic emission signal lines pass through the L-shaped conduction pipeline of the triaxial apparatus pedestal. An inner waterproof rubber plug and an outer waterproof rubber plug at two ends of the L-shaped conduction pipeline are fixed with the acoustic emission signal lines through glass cement to form an integral body. The inner waterproof rubber plug and the outer waterproof rubber plug have the same size and are respectively stuffed into the L-shaped conduction pipeline. An acoustic emission sensor is sleeved on a protective fixed hood. An induction surface of the acoustic emission sensor is parallel to the surface of a sample. A protective fixed hood handle vertically stands on the external surface of a latex film of the sample and is fixed through an upper elastic rubber ring and a lower elastic rubber ring. The coupling device provided by the invention has a simple structure, is convenient to operate, and can be adopted to monitor the acoustic emission signals caused by grain breakage and micro-crack growth during regular triaxial compression and shearing process of geotechnical materials at real time.
Description
Technical field
The invention belongs to rock-soil mechanics test field, more specifically relate to a kind of coupling device realized in the indoor collection acoustic emission signal of triaxial pressure.Be exactly that sample can be received by the calibrate AE sensor being directly pasted onto sample latex film surface in the acoustic emission signal of carrying out producing in triaxial test process specifically, reach the object of acoustic emission signal Real-Time Monitoring.The present invention is applicable to the research of the properties such as Particle Breakage, micro-crack extension of the materials such as coarse-grained soil, calcareous sand, rock.For the Particle Breakage of research understanding soil, the Crack Extension phenomenon of rock provide technical support.
Background technology
Triaxial apparatus is one of the most conventional most important experimental facilities of rock-soil mechanics research.Triaxial test is the one test measuring soil classifiction, stress-strain relation.In test, generally adopt 4 ~ 5 cylindrical specimens, respectively at different constant ambient pressure (i.e. minor principal stress σ
3under), apply axial stress σ
1, the deviator stress now produced is (σ
1-σ
3), at different deviator stress (σ
1-σ
3) under measure sample axial strain ε
1and body strain ε
v, until sample shear is switched to destruction, try to achieve soil sample shearing strength, stress-strain relation and numerical simulation analysis model parameter.
Because coarse-grained soil, in shear history, Particle Breakage phenomenon can occur, the technological means recording Particle Breakage at present is also mainly obtained by before and after specimen test separating tests.Due to the generation Elastic wave that can release energy when Particle Breakage, the Elastic wave phenomenon of this generation is called acoustic emission (Acoustic Emission is called for short AE), sometimes launches also referred to as stress wave.In order to obtain in triaxial test process the true acoustic emission signal produced, must first find a kind of structure simple, be easy to operation, the device of stable performance, can be applied to acoustic emission test technology in triaxial apparatus.Only obtain the acoustic emission signal of the Particle Breakage of high-fidelity, other research work just become possibility.
Acoustic current lift-off technology is mainly used in the Non-Destructive Testing of metal material.And the acoustic emission research of rock-soil material, particularly soil-structure interactions material aspect is also in the desk study stage.
Wuhan Inst. of Rock and Soil Mechanics, Chinese Academy of Sciences once adopted acoustic emission to monitor the ordinary triaxial test of calcareous sand, what they adopted is outside calibrate AE sensor being pasted onto triaxial cell, and the acoustic emission signal produced in sample compression, shear test process needs to be received by calibrate AE sensor through media such as confined pressure water, pressure chambers.For Large-scale Triaxial Experiments, because pressure chamber is large, pressure chamber's casing wall is thick, if calibrate AE sensor is pasted onto the outside of triaxial cell, Acoustic Emission Signal Energy loss will be more serious.The acoustic emission signal produced due to Particle Breakage is very weak, and a large amount of signal attenuation will cause the acoustic emission signal distortion received.Therefore in order to avoid the decay of signal, ensure the authenticity of the acoustic emission signal gathered, calibrate AE sensor being directly pasted onto the surface of sample, is significantly.
Summary of the invention
For the above-mentioned deficiency of prior art, the object of the invention is to there are provided a kind of coupling device realizing calibrate AE sensor acoustic emission signal in pressure indoor monitoring triaxial test process, the technical matters solved is: achieve the surface that calibrate AE sensor is directly pasted onto sample, ensure that the authenticity of the acoustic emission signal of collection; Oozing out of high confining pressure water can be prevented simultaneously, and then not affect normally carrying out of triaxial test; For convenience detach, do not affect the normal usage function of triaxial apparatus.Thus realize the object that calibrate AE sensor directly can monitor the acoustic emission signal that soil sample produces in consolidation, shear history.Structure of the present invention is simple, easy to operate, can the mechanical property of Real-Time Monitoring rock-soil material, in shear history due to acoustic emission signal that Particle Breakage, micro-crack extension produce.Less to original triaxial apparatus repacking scope, can be for convenience detach, and other functions not affecting triaxial apparatus use.This device can meet confined pressure and carry out acoustic emission monitor(ing) work for a long time up in the confined pressure environment of 1MPa, the routine intravenous of major part soil, the demand of dynamic triaxial tests can be met, especially coarse-grained soil, Coarse Aggregate, stockpile large-scale routine intravenous, dynamic triaxial Experimental on acoustic emission research, also can meet part rock normal triaxial Experimental on acoustic emission research.
In order to realize above-mentioned object, the present invention adopts following technical measures:
Realize the coupling device in the indoor collection acoustic emission signal of triaxial pressure, it is made up of the parts such as room body, piston rod, sample, base, latex film, L-type conducting pipeline, inner waterproofing rubber plug, outer water proof rubber plug, precompression plate, fastening bolt, upper India rubber circle, lower India rubber circle, protection fixed cover, calibrate AE sensor, acoustic emission signal line, acoustic emission acquisition system.Its annexation is: triaxial cell's body is in order to install sample, base is a part for room body, overlaps last layer latex film outside sample, is placed on triaxial apparatus base, and by O-ring seal, sample being fixed between base and piston rod, axle power passes on sample by piston rod.Calibrate AE sensor is placed in protection fixed cover, its sensitive surface outwardly, be close to sample, and be pressed abd fixed on outside sample on latex film together with protection fixed cover by upper India rubber circle and lower India rubber circle, India rubber circle is stuck in protection handle grooves place, fixed cover both sides.All there is a groove described protection fixed cover handle both sides, prevent rubber band from coming off due to sample deformation in process of the test.Joint for the signal wire of connecting acoustic emission sensor enters from the L-type conducting pipeline of base upper surface, and the L-type pipeline opening other by base side is drawn, and is connected in acoustic emission acquisition system.Described L-type conducting pipeline is positioned at chassis interior, and one end is communicated with pressure chamber, outside connection pressure chamber, one end.Described outer water proof rubber plug is fixed into an entirety by glass cement and signal wire, and outer water proof rubber plug is filled in the L-type conducting pipeline of base side.Precompression plate is parallel is adjacent to outer water proof rubber plug, and 4 fastening bolts are evenly fastening, and outer water proof rubber plug is slowly advanced about 4-6mm.Inner waterproofing rubber plug is fixed into an entirety by glass cement and signal wire, and after piling water towards L-type conducting pipeline, inner waterproofing rubber plug is filled in the L-type conducting pipeline of base upper surface.Described outer water proof rubber plug is fixed by the precompressed of precompression plate, and inner waterproofing rubber plug is fixed by the water pressure of confined pressure water, has jointly played strong sealing effect.
It is characterized in that: the L-type conducting pipeline (triaxial apparatus base has transformed the L-type conducting pipeline of diameter 38-42mm) of triaxial apparatus base diametrically 38-42mm, in L-type conducting pipeline, place 3-4 root sensor signal lines, realize the demand that acoustic emission signal gathers.Acoustic emission signal line, through the L-type conducting pipeline of triaxial apparatus base, is positioned at the inner waterproofing rubber plug of L-type conducting pipe ends, outer water proof rubber plug is fixed into an entirety by glass cement and acoustic emission signal line.Described inner waterproofing rubber plug and outer water proof rubber plug equal and opposite in direction, being round table-like, diameter 32-36mm on it, lower diameter 44-46mm, holes in its rubber plug center, its aperture 8-15mm, and has carried out vertical splitting to it, forms round platform opposite opened structure.Inner waterproofing rubber plug and outer water proof rubber plug are filled in L-type conducting pipeline respectively, and its China and foreign countries' water proof rubber plug is fixed on triaxial apparatus base side by the precompressed of precompression plate.On described inner waterproofing rubber plug, diameter is towards the L-type conduction pipe road junction of base upper surface, so that it fills in L-type pipeline; Outer water proof rubber beyond the Great Wall diametral plane to the conduction pipe road junction of the L-type of chassis outer side so that it is filled in L-type pipeline.Upper India rubber circle and lower India rubber circle parallel sleeve are on the outside surface of the latex film of sample, and make India rubber circle and lower India rubber circle be positioned at the centre position of specimen height, calibrate AE sensor is enclosed within protection fixed cover, and make calibrate AE sensor sensitive surface be parallel to specimen surface, protection fixed cover handle vertically stands on the latex film outside surface of sample, and is fixed by upper India rubber circle, lower India rubber circle.
Described inner waterproofing rubber plug and outer water proof rubber plug are with round platform opposite opened structure, and namely acoustic emission signal line placement the center is convenient in this kind of rubber plug structure design; Precompression plate is made up of precompression crab bolt hole and precompression plate central guiding port, precompression plate central guiding port can make acoustic emission signal line pass, and its diameter is less than the lower diameter of outer water proof rubber plug, precompression plate is by fastening bolt through precompression crab bolt hole, and external water proof rubber plug is exerted pressure fastening; Inner waterproofing rubber plug is exerted pressure fastening by confined pressure water.
Described protection fixed cover forms by protecting fixed cover room body and protecting fixed cover handle, there is a breach at the protection bright mouth place of body, fixed cover room, be convenient to calibrate AE sensor signal wire extend out, it is slightly little that protection fixed cover height compares calibrate AE sensor height, make the calibrate AE sensor sensitive surface exposure of laying, there is a groove protection fixed cover handle center position of protection fixed cover both sides, for inlaying upper India rubber circle, lower India rubber circle.
Described upper India rubber circle and lower India rubber snare, on the latex film outside surface of sample, are positioned at the center of specimen height, and two rubber bands are parallel at a distance of about 60mm, and upper India rubber circle and lower India rubber circle make by malleable material.
Calibrate AE sensor protection fixed cover is the hollow cylindrical structure of a side opening, adopts aluminum to do, each corresponding handle of its both sides of edges.Its protection fixed cover internal diameter is greater than calibrate AE sensor diameter 1-1.5mm, wall thickness 3-5mm, and two handles are about 60mm, wide about 10mm, thick about 5mm, and its handle is positioned at 1-2mm place, below opening side, is screwed on cover body wall.Described body side, protection fixed cover room has a wide height to be about the breach of 16 × 30mm, and this breach is that the wire of calibrate AE sensor is drawn.Described protection fixed cover handle is about 30mm place, has the groove of one 2 × 10mm.Lower India rubber circle, upper India rubber circle are successively enclosed within outside the latex film of sample, and sensor is placed in protection fixed cover, and the parallel and specimen surface of sensor surface, is fixed by upper and lower rubber band.Two handles of described protection fixed cover are parallel to the perpendicular line of sample.Described lower India rubber circle, the wide about 6mm of lower India rubber circle, when fixation of sensor, is stuck in the groove of protection fixed cover, fixed cover would not be made like this to roll come off because of sample deformation in process of the test.After described protection fixed cover room body design height just ensures calibrate AE sensor clamping, exposure 1 ~ 2mm, makes India rubber circle approximately apply the pressure of 5kPa to sensor.
In described realized Acoustic radiating instrument monitoring triaxial test process, the coupling device course of work of acoustic emission signal is: sensor signal wire terminal is passed from base L-type conducting pipeline external tapping, stretches out from the pipeline opening of chassis outer side.Then by glass cement, signal wire is fixed in inner waterproofing rubber plug and outer water proof rubber plug.L-type conducting pipeline outer vent filled in by outer water proof rubber plug, then by the fixing outer water proof rubber plug of precompression plate parallel extrusion, water filling in its L-type conducting pipeline, then inner waterproofing rubber plug fills in L-type insides of pipes mouth.Sample fixedly stands upright on base, outside its sample, cover has latex film, upper India rubber circle, lower India rubber snare outside latex film, calibrate AE sensor is enclosed within protection fixed cover, parallel is attached on sample, and two India rubber circles are stuck in the groove of protection fixed cover two handles.Acoustic emission signal line is connected in acoustic emission acquisition system, has covered room body, can carry out relevant triaxial test.
The present invention has the following advantages and effect:
1) this coupling device successfully achieves sensor and is directly pasted onto specimen surface, carries out the object of the acoustic emission monitor(ing) of triaxial test, and more can guarantee the authenticity of acoustic emission signal.
2) the waterproof, seepage control parts in this coupling device, have employed simple two-stage hermetically-sealed construction, first order hermetically-sealed construction adopts the crush seal of confined pressure water internal water proof rubber plug force, second level hermetically-sealed construction adopts the crush seal of precompression plate extruding outer water proof rubber plug, this apparatus structure is simple, is convenient to dismounting.When applicant utilizes this device to carry out test, find that sealing device can bear the confined pressure water pressure of 2MPa.
3) the fixing firmware for fixation of sensor adopts India rubber circle to fix, and due to the contractility of rubber band, does not impact at radial deformation sample.Applicant once adopted adhesive tape fixation of sensor, meet the water capacity and easily come off, and shrinkability is poor due to adhesive tape, and result display adhesive tape is very large on the sample radial deformation impact in triaxial shear test.
4) the protection fixed cover described in adopts aluminum to do, and has light effect, alleviates fixing pressure; There is the effect of electrostatic screening simultaneously, make acoustic emission signal strong interference immunity.
The present invention is reasonable in design, and structure is simple, and can be for convenience detach.Calibrate AE sensor is directly installed on inside, pressure chamber, by the conducting orifice of triaxial apparatus base, sensor signal lines is extracted again, by two-stage Sealing Technology, ensure the strong leakproofness of L-type pipeline conducting orifice, thus the acoustic emission signal produced in triaxial compressions, shear test process can be monitored in real time, truly.For the acoustic emission research of the characteristic such as Particle Breakage, micro-crack extension is laid a good foundation.
The soft rock Coarse Aggregate large-scale triaxial shear test research of applicant's coupling acoustic emission that utilized this coupling device to carry out, achieve good technique effect, also show that this coupling device has possessed above-described advanced technology feature, can be used for the Experimental on acoustic emission research of the properties such as Particle Breakage, micro-crack extension of carrying out the material such as coarse-grained soil, rock.Test and achievement are summarized as follows:
The soft rock Coarse Aggregate large-scale triaxial shear test research of the coupling acoustic emission that utilized this coupling device to carry out, emphasis explores characteristics of Acoustic Emission during soft rock Coarse Aggregate Particle Breakage.Figure a ~ figure b gives the soft rock Coarse Aggregate large-scale triaxial shear test typical case result map of coupling acoustic emission, figure a ~ figure b can find out: sensor is placed on outside pressure chamber, a large amount of acoustic emission signal decay disappearances can be caused, test findings shows, under same test conditions, sensor is placed on the Ring-down count shearing overall process in pressure chamber and is placed on high two orders of magnitude of the Ring-down count shearing overall process outside pressure chamber than sensor.Adopt the coupling device developed to achieve good technique effect, disclose the characteristics of Acoustic Emission of soft rock Coarse Aggregate Particle Breakage.
Accompanying drawing explanation
Fig. 1 is a kind of coupling device schematic diagram realized in the indoor collection acoustic emission signal of triaxial pressure.
Fig. 2 is a kind of plane elevation cross-sectional view of precompression plate.
Fig. 3 a is a kind of front elevation of water proof rubber plug.
Fig. 3 b is a kind of water proof rubber plug and acoustic emission signal line installation diagram.
Fig. 4 is that secondary water-tight device installs front elevation.
Fig. 5 a is that a kind of calibrate AE sensor installs front elevational schematic.
Fig. 5 b is that schematic diagram is looked on a kind of calibrate AE sensor installation right side.
Fig. 6 a is a kind of vertical view of protective cover.
Fig. 6 b is the front elevation that a kind of protective cover and sensor are installed.
Figure a is the acoustic emission signal counting diagram gathered in pressure chamber.
Figure b is the acoustic emission signal counting diagram of pressure taken outdoors.
Accompanying drawing acceptance of the bid note is described below: 1-room body; The upper India rubber circle of 2-; India rubber circle under 3-; 4-sample; 5-base; 6-piston rod; 7-confined pressure water; 8-latex film; 9-calibrate AE sensor (such as PAC company R6I-UC type calibrate AE sensor); 10-protects fixed cover; 11-L type conducting pipeline; 12-precompression plate; 13-fastening bolt; 14-inner waterproofing rubber plug; The outer water proof rubber plug of 15-; 16-acoustic emission acquisition system (as PAC company DiSP system); 17-acoustic emission signal line; 18-protects fixed cover groove; 19-protects fixed cover room body; 20-protects fixed cover handle; 21-precompression crab bolt hole; 22-precompression plate central guiding port; 23-glass cement (as Switzerland's west card AP multifunctional glass glue).
Embodiment
With reference to the accompanying drawings the present invention is described in further detail below:
1 ~ Fig. 6 is known with reference to the accompanying drawings, this coupling device by room body 1, sample 4, piston rod 6, base 5, latex film 8, L-type conducting pipeline 11, inner waterproofing rubber plug 14, outer water proof rubber plug 15, precompression plate 12, fastening bolt 13, upper India rubber circle 2, lower India rubber circle 3, protection fixed cover 10, calibrate AE sensor 9, acoustic emission signal line 17, acoustic emission acquisition system 16 is formed.Described protection fixed cover 10 is by protection fixed cover groove 18, and protection fixed chamber body 19, protection fixed handle 20 is formed.Described precompression plate 12 is made up of precompression crab bolt hole 21 and precompression plate central guiding port 22.Its annexation is: sample 4 is fixed on triaxial apparatus base 5, overlaps last layer latex film 8 outside sample 4, by O-ring seal, sample 4 is fixed between base 5 and piston rod 6.Calibrate AE sensor 9 is placed in the protection fixed chamber body 19 of protection fixed cover 10, and its sensitive surface, to be fixed on outside sample on rubber membrane 8 by upper India rubber circle 2 and lower India rubber circle 3 outwardly.Described protection fixed cover handle 20 both sides all have one to protect fixed cover groove 18.Described protection fixed cover groove 18, for the effect of rubber band clamping protection fixed cover 10.Joint for the acoustic emission signal line 17 of connecting acoustic emission sensor 9 enters from the L-type conducting pipeline 11 of base upper surface, 11 mouthfuls, the L-type pipeline extraction that base side is other.It is inner that described L-type conducting pipeline 11 is positioned at base 5.Described outer water proof rubber plug 15 is fixed into an entirety by glass cement 23 and acoustic emission signal line 17, and outer water proof rubber plug 15 is filled in the L-type conducting pipeline 11 of base 5 side.Precompression plate 12 is parallel, and to be adjacent to outer water proof rubber plug 15,4 fastening bolts 13 evenly fastening, and outer water proof rubber plug 15 is slowly advanced about 5mm.Inner waterproofing rubber plug 14 is fixed into an entirety by glass cement 23 and acoustic emission signal line 17, and after piling water to L-type conducting pipeline 11, inner waterproofing rubber plug 14 is filled in the L-type conducting pipeline 11 of base 5 upper surface.Room body 1 is fixed on base 5, and acoustic emission signal line 17 is connected in acoustic emission acquisition system 16, puts into confined pressure water 7 to after stable, the triaxial test of acoustic emission of can carrying out being coupled.Described outer water proof rubber plug 15 is fixed by precompression plate 12 precompressed, and inner waterproofing rubber plug 14 is fixed by the water pressure of confined pressure water 7, has jointly played strong sealing effect.
It is characterized in that: triaxial apparatus base 5 diametrically 38 or 40 or the L-type conducting pipeline 11 (first the joint of acoustic emission signal line 17 is about the L-type conducting pipeline 11 of 40mm through triaxial apparatus base 5 alteration) of 42mm, acoustic emission signal line 17 passes, as shown in Fig. 1, Fig. 5 a from top to bottom through L-type conducting pipeline 11.Be positioned at the acoustic emission signal line 17 at L-type conducting pipeline 11 two ends place, first waterproof insulation tape wrapping is adopted, settle inner waterproofing rubber plug 14, outer water proof rubber plug 15 inner, carry out sealing by glass cement 23 again to fix, make signal wire firmly be fixed on rubber plug center, make signal wire become to be integrated with rubber plug.Subsequently inner waterproofing rubber plug 14, outer water proof rubber plug 15 are filled in L-type conducting pipeline 11.Described inner waterproofing rubber plug 14, outer water proof rubber plug 15 as shown in Figure 3 a, are made by rubber.Its version, as shown in Fig. 3 a, 3b, is a round platform opposite opened, diameter 32-36mm on it, lower diameter 44-46mm, center bore 8-15mm.
Described inner waterproofing rubber plug 14 and outer water proof rubber plug 15 are with round platform opposite opened structure, and namely this kind of rubber plug structure design is convenient to acoustic emission signal line 17 and is placed the center; Precompression plate 12 is made up of precompression crab bolt hole 21 and precompression plate central guiding port 22, precompression plate central guiding port 22 can make acoustic emission signal line 17 pass, and its diameter is less than the lower diameter of outer water proof rubber plug 15, precompression plate is by fastening bolt 13 through precompression crab bolt hole 21, and external water proof rubber plug is exerted pressure fastening; Inner waterproofing rubber plug 14 is exerted pressure fastening by confined pressure water 7.
Described protection fixed cover 10 is made up of protection fixed cover room body 1 and protection fixed cover handle 20, there is a breach at protection body 19 bright mouthfuls of places, fixed cover room, be convenient to acoustic emission signal line 17 extend out, in protection fixed cover room body 19, height compares the highly little 1-2mm of calibrate AE sensor 9, make the calibrate AE sensor 9 sensitive surface exposure of laying, protection fixed cover handle 20 centre bit of protection fixed cover 10 both sides is equipped with a groove, for inlaying upper India rubber circle, lower India rubber circle.
Described upper India rubber circle 2 is enclosed within latex film 8 outside surface of sample 4 with lower India rubber circle 3, be positioned at the center of sample 4 height, and upper India rubber circle 2 is parallel with lower India rubber circle 3 at a distance of about 60mm, and upper India rubber circle 2 and lower India rubber circle 3 make by malleable material (as aluminium, copper etc.).
Precompression plate 12 is made up of 4 precompression crab bolt holes 21, precompression plate central guiding port 22, as shown in Figure 2.Its center bore is about 30mm, thick about 10mm.Acoustic emission signal line 17 is passed by the precompression plate central guiding port 22 of precompression plate 12, on the surface being close to the lower diameter of outer water proof rubber plug 15 making precompression plate parallel, is fixed on base 5 firmly, as shown in Figure 4 by 4 fastening bolts 13.
Sample 4 is fixed on base 5 top, its sample 4 surface cover has one deck latex film 8, lower India rubber circle 3, upper India rubber circle 2 are successively enclosed within latex film 8, and its rubber band is positioned at the centre position of sample 4 height, and upper India rubber circle 2 is parallel with lower India rubber circle 3 at a distance of about 60mm.Calibrate AE sensor 9 is enclosed within protection fixed chamber body 1, one deck vaseline is smeared in sensor sensing face, then sensor sensing face and specimen surface parallel contact is made, the protection fixed handle 20 of protection fixed cover 10 vertically stands on sample 4 surface, and regulate the position of upper India rubber circle 2, lower India rubber circle 3, can be stuck in protection fixed cover groove 18, as shown in Fig. 5 a, 5b.
In the present embodiment, room body 1 and base 5 are isolating constructions, are all separate type between calibrate AE sensor 9, protection fixed cover 10 and upper India rubber circle 2, lower India rubber circle 3.And calibrate AE sensor 9 and acoustic emission signal line 17 are monolithic constructions, inner waterproofing rubber plug 14, outer water proof rubber plug 15 are monolithic constructions with acoustic emission signal line 17, are all separate type between the L-type conducting pipeline 11 of precompression plate 21, outer water proof rubber plug 15, base 5.
When using of the present invention, confined pressure water 7 and piston rod 6 acting in conjunction of filling in room body 1, produce σ to sample 4
1axle pressure, and σ
3ambient pressure.Wherein be placed on base 5 with the cylindrical specimens 4 that latex film 8 is wrapped up.Calibrate AE sensor 9 is fixed on the surface of sample 4 by protection fixed cover 10 and upper India rubber circle 2, lower India rubber circle 3.Extraneous signal acquiring system 16 is connected to through the conducting orifice of base 5 for connecting acoustic emission signal wire 17.Wherein base conducting orifice takes two-stage safeguard procedures airtight.When piston rod 6 and confined pressure water 7 acting in conjunction are on sample 4, the acoustic emission signal that sample produces is received by calibrate AE sensor 9, and is transferred in acoustic emission acquisition system 16 by acoustic emission signal line 17.The present invention can realize gathering the acoustic emission signal produced in monitoring triaxial test process, and the Particle Breakage of sample generation, the expansion of micro-crack are carried out to dynamic, quantitative and harmless measurement, thus obtained the acoustic emission data under sample stress.
The device scope of application:
The invention provides a kind of coupling device realized in the indoor collection acoustic emission signal of triaxial pressure, be applicable to the Experimental on acoustic emission research of the properties such as the Particle Breakage of the materials such as the coarse-grained soil in rock-soil mechanics field, rock, micro-crack extension.
Claims (4)
1. one kind can realize the coupling device in the indoor collection acoustic emission signal of triaxial pressure, it comprises L-type conducting pipeline (11), inner waterproofing rubber plug (14), outer water proof rubber plug (15), precompression plate (12), upper India rubber circle (2), lower India rubber circle (3), protection fixed cover (10), it is characterized in that: the L-type conducting pipeline (11) of triaxial apparatus base (5) diametrically 38-42mm, 3-4 root acoustic emission signal line (17) is placed in L-type conducting pipeline (11), acoustic emission signal line (17) is through the L-type conducting pipeline (11) of triaxial apparatus base (5), be positioned at the inner waterproofing rubber plug (14) at L-type conducting pipeline (11) two ends, outer water proof rubber plug (15) is fixed into an entirety by glass cement (23) and acoustic emission signal line (17), inner waterproofing rubber plug (14) and outer water proof rubber plug (15) equal and opposite in direction, be round table-like, diameter 32-36mm on it, lower diameter 44-46mm, inner waterproofing rubber plug (14) and outer water proof rubber plug (15) are filled in L-type conducting pipeline (11) respectively, its China and foreign countries' water proof rubber plug (15) are fixed on triaxial apparatus base (5) side by precompression plate (12) precompressed, the upper diameter of inner waterproofing rubber plug (14) is towards L-type conduction pipe (11) road junction of base upper surface, the upper diametral plane of outer water proof rubber plug (15) is to conduction pipe (11) road junction of the L-type of chassis outer side, upper India rubber circle (2) and lower India rubber circle (3) parallel sleeve are on the outside surface of the latex film (8) of sample (4), upper India rubber circle (2) and lower India rubber circle (3) are positioned at the centre position of sample (4), calibrate AE sensor (9) is enclosed within protection fixed cover (10), calibrate AE sensor (9) sensitive surface is parallel to sample (4) surface, protection fixed cover (10) handle vertically stands on latex film (8) outside surface of sample (4), by upper India rubber circle (2), lower India rubber circle (3) is fixed.
2. a kind of coupling device realized in the indoor collection acoustic emission signal of triaxial pressure according to claim 1, it is characterized in that: described inner waterproofing rubber plug (14) and outer water proof rubber plug (15) are with round platform opposite opened structure, precompression plate (12) is made up of precompression crab bolt hole (21) and precompression plate central guiding port (22), precompression plate (12) central guiding port (22) makes acoustic emission signal line (17) pass, and the diameter of precompression plate central guiding port (22) is less than the lower diameter of outer water proof rubber plug (15), precompression plate (12) by fastening bolt (13) through precompression plate (12) bolt hole (21), outer water proof rubber plug (15) is exerted pressure fastening, inner waterproofing rubber plug (14) is exerted pressure fastening by confined pressure water (7).
3. a kind of coupling device realized in the indoor collection acoustic emission signal of triaxial pressure according to claim 1, it is characterized in that: described protection fixed cover (10) is made up of protection fixed cover room body (1) and protection fixed cover handle (20), protection fixed cover room body (19) has a breach, it is highly little that protection fixed cover room body (19) interior height compares calibrate AE sensor (9), calibrate AE sensor (9) the sensitive surface exposure of laying, protection fixed cover handle (20) centre bit of protection fixed cover (10) both sides is equipped with a groove, inlay India rubber circle (2), lower India rubber circle (3).
4. a kind of coupling device realized in the indoor collection acoustic emission signal of triaxial pressure according to claim 1, it is characterized in that: described upper India rubber circle (2) is parallel with lower India rubber circle (3) at a distance of 60mm, and upper India rubber circle (2) and lower India rubber circle (3) are made by ductile material.
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| CN112578026B (en) * | 2020-12-10 | 2023-10-20 | 重庆电子工程职业学院 | Fixing device of acoustic emission sensor |
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| JP3234701B2 (en) * | 1993-12-24 | 2001-12-04 | 株式会社ボッシュオートモーティブシステム | Ultrasonic detector |
| CN101311717B (en) * | 2007-05-21 | 2011-02-02 | 中国科学院金属研究所 | Rotary type ultrasound flaw-detecting coupling device of probe for detecting defect of pipes and bar material |
| CN201083725Y (en) * | 2007-09-13 | 2008-07-09 | 宝山钢铁股份有限公司 | Ultrasonic coupling apparatus |
| CN203259508U (en) * | 2013-06-01 | 2013-10-30 | 中国科学院武汉岩土力学研究所 | Coupling device capable of collecting acoustic emission signals in tri-axial pressure chamber |
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| CN106836170A (en) * | 2017-03-30 | 2017-06-13 | 郑州大学 | A kind of method that utilization acoustic emission detection roadbase is damaged |
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