CN209215181U - It can receive the rock seepage pressure room of acoustic emission signal - Google Patents
It can receive the rock seepage pressure room of acoustic emission signal Download PDFInfo
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- CN209215181U CN209215181U CN201821857389.1U CN201821857389U CN209215181U CN 209215181 U CN209215181 U CN 209215181U CN 201821857389 U CN201821857389 U CN 201821857389U CN 209215181 U CN209215181 U CN 209215181U
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Abstract
The utility model discloses the rock seepage pressure rooms of receivable acoustic emission signal, are from top to bottom successively arranged seaming chuck, pressure indoor and push-down head, and top cover labyrinth is equipped between the seaming chuck and pressure indoor, and lower sealing cover is equipped between the pressure indoor and push-down head；The utility model not only solves the problem of acoustic emission signal reception device can not be placed on pressure chamber, and the selection space of position is further more received to acoustic emission signal receiving transducer, meet the accurate collection in three axis seepage tests of rock to acoustic emission signal, and structure is simple, easy to use, cheap, convenient for being generalized to indoor rock mechanics experiment field.
Description
Technical field
The utility model relates to can receive the rock seepage pressure room of acoustic emission signal.
Background technique
Due to the overall national strength in China and the continuous improvement of demand, China enters going through for infrastructure rapid development
History period.In various infrastructures, rock is as natural material widely distributed in a kind of earth's crust, property and engineering construction
It is closely related.China's distribution of water resources is extensive, in the engineering construction under rich water environment, the country rock that causes due to underground water
Situations such as unstable failure, happens occasionally.Therefore the rock mechanics under the effect of research osmotic pressure and failure mechanism are for rich water rock
The prominent discharge disaster prevention and treatment in molten tunnel is of great significance.
Even if lot of domestic and foreign scholar is deduced the numerous constitutive relation formula of quantity for many years, but due to rock material
The properties such as the heterogeneous, anisotropy of material, so that being difficult directly to utilize theoretical formula that guidance is gone to give birth in Practical Project construction
It produces.Therefore rock mechanics experiment becomes research direction essential and very important in rock mechanics field.
Rock is due to that can gradually form inside it crack and constantly expand by osmotic pressure and the load action being gradually increased
Exhibition, forms macroscopic macroscopic cracking, and final perforation destroys.And during crack generates and develops this, it is adjoint always
The sending of acoustic emission signal.Sound emission monitoring technology is able to reflect rock interior fractured situation in loading procedure, thus
The faulted condition for judging rock can grind the destructive process of rock in terms of macroscopic view, microcosmic two in conjunction with mechanical analysis
Study carefully.Therefore, acoustic emission testing technology is added can preferably mechanical property and broken spy of the study of rocks under the effect of seepage flow pressure
Sign, in depth understands cranny development stage and feature in failure mechanism of rock and its process, and then more scientific, accurately
Instructing manufacture.There are many scholars to be aided with acoustic emission testing technology during three axis seepage tests of rock at present.
However since the pressure chamber of rock three-axis infiltration experiment machine needs to keep sealing, the reception of acoustic emission detection system is visited
Head needs to be close to just receive complete and accurate acoustic emission signal inside sample again.This contradiction causes most of three
Sound emission receiving transducer during axis seepage tests can only be placed on the outside of pressure chamber with having to take the second best.This placement side
Formula cause acoustic emission signal receive delay and it is imperfect.Its reason is: hydraulic oil, rock sample are 1. full of inside pressure chamber
Acoustic emission signal by the both side surface of pressure chamber and inside hydraulic oil after signal strength certainly will will weaken, cause letter
Number reception is imperfect；2. the acoustic emission signal at rock sample a certain moment is just examined by sound emission via after the 1. described propagated
Receiving transducer is surveyed to receive, and the cranny development of rock sample at this time with do not issue the fractured situation at moment not
Together, sound emission is caused to receive sluggish situation；3. there are osmotic pressure in three axis seepage tests, the presence of water is to acoustic emission signal
Reception exist interference.Based on three above reason, brought to the acoustic emission signal collection of three axis seepage tests process of rock
It is difficult.The pressure chamber of conventional and sound emission signal receiving device are difficult to solve.And currently, being directed to receivable sound emission letter
Number three axis seepage pressure room of rock it is fewer and fewer.
Utility model content
The purpose of the utility model is to overcome in place of the deficiencies in the prior art, the rock of receivable acoustic emission signal is provided
Stone seepage pressure room solves probe placement in above-mentioned background technique and acoustic emission signal is caused to receive delay on the outside of pressure chamber
And the problems such as imperfect.
The technical scheme adopted by the utility model to solve the technical problem is as follows: providing the rock of receivable acoustic emission signal
Stone seepage pressure room is from top to bottom successively arranged seaming chuck, pressure indoor and push-down head, is equipped between the seaming chuck and pressure indoor
Top cover labyrinth is equipped with lower sealing cover between the pressure indoor and push-down head；
Shell is nested on the inside of the peripheral wall of the pressure indoor, the shell is hollow cylindrical, is covered on the interior of pressure indoor
Wall setting, the inner cavity of the shell is for placing rock sample to be measured；Groove, the groove are offered on the side wall of the shell
Opening inwardly, and drops to bottom end as axis, by the top spiral of shell using casing center axis；Sound hair is placed in the groove
The received probe of signal is penetrated, the probe is connect by conducting wire with sound signalling amplifier, the sound signalling amplifier setting
Outside pressure indoor, the conducting wire ecto-entad penetrates pressure indoor and shell extends in groove；The pressure indoor peripheral wall opens up
There is oil inlet, the oil inlet extends to inner cavity through shell.
In one preferred embodiment of the utility model, the groove body section of the groove is semicircle, one side position of arc
In lumen side, the side for being set to shell on one side and leaning on pressure indoor peripheral wall of straight line.
In one preferred embodiment of the utility model, the radius of the groove is not more than the 1/2 of thickness of shell.
In one preferred embodiment of the utility model, the groove section start of the shell is described by the stifled fill plug seal of oil
Oil, which blocks, sets first through hole；The peripheral wall of the pressure indoor offers the second through-hole, the first through hole and the perforation of the second through-hole, institute
It states conducting wire and reaches groove across the second through-hole and first through hole.
In one preferred embodiment of the utility model, the gap between the first through hole, the second through-hole and conducting wire is equipped with ring
Oxygen resin seal circle.
In one preferred embodiment of the utility model, the bottom of the push-down head is equipped with pedestal.
The technical program compared with the background art, it has the following advantages:
1. groove is opened in enclosure interior, in conjunction with pressure indoor, shell, oily stifled and through-hole design, keep probe deep enough
On the inside of pressure chamber, utmostly avoids acoustic emission signal and receive delay and imperfect, and the devices such as amplifier are protected as outside
The convenience of signal handset processes is demonstrate,proved；
2. groove is the design of spiral structure drop, sound emission receiving transducer can be placed on to any position of groove, give sound
Transmitting probe receiver more receives the selection space of position, to facilitate each position to rock sample to carry out sound emission
Signal collection；
3. groove is semicircle, the distribution of arc-shaped side and straight line and size design are reasonable, and ensure that probe in movement
Period does not fall, and in turn ensures that shell will not collapse fragment, formation permanent deformation destruction out because rupturing in test course of exerting pressure, can
It is strong to test repeatability for Reusability；
4. pressure chamber structure is simple, easy to use, cheap, it can not only meet three axis seepage tests, can also make list
Axis seepage tests, applicability is wide, convenient for being generalized to indoor rock mechanics experiment field.
Detailed description of the invention
Fig. 1 is this programme overall structure diagram.
Fig. 2 is this programme pressure indoor structural schematic diagram.
Fig. 3 is groove helical arrangement schematic diagram.
Fig. 4 is pressure indoor top view.
Fig. 5 is enlarged diagram at I in Fig. 2.
Specific embodiment
Fig. 1-5 is please referred to, the rock seepage pressure room of the receivable acoustic emission signal of the present embodiment is from top to bottom successively set
There are seaming chuck 1, pressure indoor 3, push-down head 5 and pedestal, top cover labyrinth 2 is equipped between the seaming chuck 1 and pressure indoor 3, it is described to enclose
Lower sealing cover 4 is equipped between pressure chamber 3 and push-down head 5；The present embodiment improves traditional pressure chamber, so that the sound that internal receipt arrives
Transmitting signal can be transferred to external sensor in real time by communication line.Top cover labyrinth 2 and lower sealing cover 4 simultaneously, in conjunction with
Following sealing structures ensure that the leakproofness when confining pressure pressure cylinder is full of hydraulic oil, i.e., enclose in the case where there is confining pressure
Pressure pressure cylinder no leakage.
Shell 8 is nested on the inside of the peripheral wall of the pressure indoor 3, the shell 8 is hollow cylindrical, is covered on pressure indoor 3
Inner wall setting, the inner cavity of the shell 8 is for placing rock sample 14 to be measured；3 peripheral wall of pressure indoor offers oil inlet
6, the oil inlet 6 extends to inner cavity through shell 8.
Offer groove 7 on the side wall of the shell 8, the opening of groove 7 inwardly, and using 8 central axis of shell as axis,
Bottom end is dropped to by the top spiral of shell 8；The groove body section of the groove 7 is semicircle, and arc is located at inner cavity on one side
Side, the side for being set to shell 8 on one side and leaning on 3 peripheral wall of pressure indoor of straight line.The radius of the groove 7 is no more than 8 thickness of shell
1/2, if because the hollow cylindrical side wall thinnest part thickness it is too small, apply confining pressure when pressure chamber can be caused permanently
Property deformation destroy；If rock sample 14 destroys during test, the fragment that rupture generates can collapse out around, and then to institute
It states hollow cylindrical side wall and generates destruction.
It is placed with the received probe 9 of acoustic emission signal in the groove 7, due to the arrangement of 7 spiral descending manner of groove, can incite somebody to action
Sound emission receiving transducer 9 is placed on any position of groove 7, to facilitate each position to rock sample 14 to carry out sound emission
Signal collection.The probe 9 is connect by conducting wire with sound signalling amplifier 10, and the sound signalling amplifier 10, which is set to, to be enclosed
Outside pressure chamber 3, the conducting wire ecto-entad penetrates pressure indoor 3 and shell 8 extends in groove 7；
7 beginning of groove is in 8 upside of shell, and 7 end of groove passes through in 8 downside of shell, 7 section start of groove
Stifled 11 fill plug seals of oil, the oil stifled 11 are equipped with the first through hole 13 passed through for conducting wire；The peripheral wall of the pressure indoor 3 offers
Second through-hole 12, the first through hole 13 and the perforation of the second through-hole 12, the conducting wire pass through the second through-hole 12 and first through hole 13
Reach groove 7.In the present embodiment, through-hole be should not be too large, should be according to sound emission in used acoustic emission signal collection system
The size of receiving transducer 9 determines.
To guarantee sealing, the gap between the first through hole 13, the second through-hole 12 and conducting wire is equipped with epoxy resin sealing ring
15, make there is shell 8 in the case where confining pressure to be used as confining pressure pressure cylinder, realizes no leakage.
To carry out carrying out rock three using this programme under certain confining pressure for stress-seepage coupling test to rock sample 14
Axis Seepage Experiment is arranged as follows:
(1) rock sample assembles
Will according to the requirement established standards of International Society of Rock Mechanics (ISRM) having a size of diameter 50mm, height 100mm, on
It sticks for measuring axial deformation and circumferential direction on 14 surface of standard cylinder rock sample of the lower end surface irregularity degree less than 0.05mm
The foil gauge of deformation is simultaneously put into shell 8.It is packed into the upper and lower pressure head 5 that can apply infiltration water and tightens upper and lower sealing cover 4.
(2) sound emission reception device is installed
Acoustic emission signal receiving transducer 9 and conducting wire are placed in the rotation descending manner groove 7 in shell 8 by through-hole,
The position of required placement is determined according to specific test requirements document.The conducting wire of sound emission passes through the first through hole 12 set in oil stifled 11 and side
Second through-hole 13 of wall is connected to outside pressure indoor 3, and is connect with acoustic emission signal amplifier 10.
(3) fixation pressure room
Mounted pressure indoor 3 and upper and lower pressure head 5 are placed on the pedestal of three-axis tester lower bottom oil cylinder and are consolidated
It is fixed, guarantee that the top of three-axis tester loads and oil inlet pipe is connected to external oil pipe.
It is found through experiment that the present apparatus effectively meets in three axis seepage tests of rock compared with traditional triaxial cell
To the accurate collection demand of acoustic emission signal, test effect is more significant.
Embodiment 2
Embodiment 2 the difference from embodiment 1 is that: utilize the present apparatus to carry out uniaxial seepage tests.
Due to including the shell 8 in the pressure indoor 3, thus can greatly reduce in uniaxial seepage tests infiltration water because
The situation for lacking limitation and being oozed out from 14 top of rock sample and sidewall surfaces.Traditional uniaxial seepage tests prevent infiltration water from seeping
Way out is that according to interval 5~8min continuous spray, 3 water-stops, (methylsiloxane: Si-4% dissociates in its side surface
Alkali -5%), natural air drying after spraying, the depth that is effectively immersed of water-stop is 3~6mm after measured, and crystallization, warp are formed in 12h
The test specimen of waterproofing agent treatment need to shelve 12h.Traditional approach is to carry out pre-treatment to rock sample 14.It may be to rock sample 14
Mechanical property interferes, and influences the accuracy of follow-up test result.And the overlong time that pre-treatment is needed to wait for influences to try
Test progress and efficiency.Therefore, the present apparatus substantially increases the test accuracy and test efficiency of uniaxial seepage tests, not only solves
Acoustic emission signal reception device can not be placed on the problem in pressure chamber, and further give acoustic emission signal receiving transducer 9
More selection spaces for receiving position.It can need to receive acoustic emission signal according to test around entire rock sample 14
Collection, and traditional acoustic emission signal reception pressure head can only collect the acoustic emission signal near end.
The above, only the utility model preferred embodiment, therefore, it cannot be limited according to, and the utility model is implemented
It is practical new to should still belong to this for range, i.e., equivalent changes and modifications made according to the scope of the patent of the utility model and the content of the manual
In the range of type covers.
Claims (6)
1. the rock seepage pressure room of receivable acoustic emission signal, it is characterised in that: be from top to bottom successively arranged seaming chuck, confining pressure
Room and push-down head are equipped with top cover labyrinth, are equipped with down between the pressure indoor and push-down head close between the seaming chuck and pressure indoor
Capping；
Shell is nested on the inside of the peripheral wall of the pressure indoor, the shell is hollow cylindrical, and the inner wall for being covered on pressure indoor is set
It sets, the inner cavity of the shell is for placing rock sample to be measured；Groove, the groove opening are offered on the side wall of the shell
Inwardly, and using casing center axis as axis, by the top spiral of shell bottom end is dropped to；Acoustic emission letter is placed in the groove
Number received probe, the probe are connect by conducting wire with sound signalling amplifier, and the sound signalling amplifier, which is set to, to be enclosed
Outside pressure chamber, the conducting wire ecto-entad penetrates pressure indoor and shell extends in groove；The pressure indoor peripheral wall offer into
Hydraulic fluid port, the oil inlet extend to inner cavity through shell.
2. the rock seepage pressure room of receivable acoustic emission signal according to claim 1, it is characterised in that: the groove
Groove body section be semicircle, arc is located at lumen side on one side, and straight line is set to shell by pressure indoor peripheral wall on one side
Side.
3. the rock seepage pressure room of receivable acoustic emission signal according to claim 1, it is characterised in that: the groove
Radius be not more than thickness of shell 1/2.
4. the rock seepage pressure room of receivable acoustic emission signal according to claim 1, it is characterised in that: the shell
Groove section start by the stifled fill plug seal of oil, the oil, which blocks, sets first through hole；The peripheral wall of the pressure indoor offers second
Through-hole, the first through hole and the perforation of the second through-hole, the conducting wire passes through the second through-hole and first through hole reaches groove.
5. the rock seepage pressure room of receivable acoustic emission signal according to claim 4, it is characterised in that: described first
Gap between through-hole, the second through-hole and conducting wire is equipped with epoxy resin sealing ring.
6. the rock seepage pressure room of receivable acoustic emission signal according to claim 1, it is characterised in that: the pushing
The bottom of head is equipped with pedestal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821857389.1U CN209215181U (en) | 2018-11-12 | 2018-11-12 | It can receive the rock seepage pressure room of acoustic emission signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821857389.1U CN209215181U (en) | 2018-11-12 | 2018-11-12 | It can receive the rock seepage pressure room of acoustic emission signal |
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| CN209215181U true CN209215181U (en) | 2019-08-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109374499A (en) * | 2018-11-12 | 2019-02-22 | 华侨大学 | A kind of rock seepage pressure room of receivable acoustic emission signal |
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- 2018-11-12 CN CN201821857389.1U patent/CN209215181U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109374499A (en) * | 2018-11-12 | 2019-02-22 | 华侨大学 | A kind of rock seepage pressure room of receivable acoustic emission signal |
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