CN206311421U - Rock joint Experimental Ultrasonic device and its control system under complex stress - Google Patents
Rock joint Experimental Ultrasonic device and its control system under complex stress Download PDFInfo
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- CN206311421U CN206311421U CN201621397200.6U CN201621397200U CN206311421U CN 206311421 U CN206311421 U CN 206311421U CN 201621397200 U CN201621397200 U CN 201621397200U CN 206311421 U CN206311421 U CN 206311421U
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Abstract
The utility model discloses rock joint Experimental Ultrasonic device and its control system under a kind of complex stress, including rigid frame, there is lab space inside rigid frame, its basal sliding sets horizontal sliding bearing plate, be rigidly connected dynamometer, axial ultrasonic vibration transducer, tangential single-excitation ultrasonic oval vibration energy converter and axially loaded piece successively on horizontal sliding bearing plate, axial hydraulic unit driver is installed at rigid frame top, and axial hydraulic actuator piston end is rigidly connected dynamometer, axial ultrasonic vibration transducer, tangential single-excitation ultrasonic oval vibration energy converter and axially loaded piece successively；The front of rigid frame, the back side, the left side and the right side are each horizontally mounted one group of tangential hydraulic unit driver, the tangential tangential loading piston of hydraulic unit driver pistons end connection, and the tangential loading piston other end is rigidly connected dynamometer and tangential loading blocks successively.The utility model can simulate the stress field state of the joint plane in subterranean body, and carry out ultrasonic dynamic experiment.
Description
Technical field
The utility model belongs to Geotechnical Engineering Rock Mechanics Test, technical field of measurement and test, and more particularly to a kind of complexity should
Rock joint Experimental Ultrasonic device and its control system under power.
Background technology
Rock joint has significant impact to the stress wave propagation in rock mass, and rock joint complicated mechanical property in itself
The stress wave transmission property of different type rock joint is different with causing in geologic diversity, therefore rock joint
The research of stress wave transmission property has significant meaning.The stress wave transmission research of rock joint is for research joint to stress wave
Propagation effect feature and the inverting joint mechanical property of itself have important effect, and its achievement in research is widely applied to ground
The fields such as engineering seismology response analysis, geology physical prospecting.And found according to substantial amounts of rock joint Experiments of Machanics, rock joint itself
Mechanical property and rock joint on suffered stress state be it is closely related, and mechanical property with stress state in non-
Linear trends of change；Again because in Practical Project geologic structure, stress field is objective reality in rock mass, and causes original
In rock mass there is certain primary stress in joint plane；But in the sampling laboratory experiment of rock joint, primary stress is often
Ignore.Therefore the stress wave propagation rule at study of rocks joint should consider the stress of rock joint.
Main currently used for rock joint experiment has Hopkinson pressure bar experiment and rock joint Experimental Ultrasonic.
Hopkinson pressure bar is one-dimensional pulse stress wave experimental provision, is the instrument that the development age is the most remote, and experience
After innovation larger several times, can be used to the reflection to stress pulse in rock joint, transmission behavior and be simulated and test.
It is characterized in that stress wave amplitude is high, energy density is higher, the acquisition of test number is also comparatively fine.Its joint rock sample confined pressure
Can be zero, it is also possible to by adding triaxial cell, stress wave reflection, transmission row of the simulation rock under with confined pressure situation
For.The defect of Hopkinson pressure bar experiment is that can not freely change answering in Rock Joint Plane by the loading of testing machine
Power state, and it is not easily controlled stress wave waveform.
Rock joint Experimental Ultrasonic is usually to apply short arc dither load to joint rock sample, with Hopkinson pressure bar
Experiment is compared, and Experimental Ultrasonic can not typically embody the kinematic nonlinearity property at joint.But due to being to apply high frequency vibrating live load
Carry, therefore more convenient stress wave propagation property and mechanical property at joint itself by Spectrum Analysis joint.Rock joint surpasses
The defect of sound experiment is similar with Hopkinson pressure bar experiment, and rock joint Experimental Ultrasonic can not be come from by the loading of testing machine
By the stress state in change Rock Joint Plane.
Therefore, how to solve the defect of above-mentioned prior art presence becomes the direction of art personnel effort.
Utility model content
The purpose of this utility model is just to provide rock joint Experimental Ultrasonic device and its control system under a kind of complex stress
System, solves Experimental Ultrasonic of the rock joint under complex stress condition, and joint rock sample is entered by servo-hydraulic loading system
Row multiaxis Combined Loading, is achieved any stress state in Rock Joint Plane, so as to solve above-mentioned the deficiencies in the prior art
Part.
The purpose of this utility model is realized by following technical proposals：
Rock joint Experimental Ultrasonic device under a kind of complex stress, including rigid frame, axially loaded piece, tangential loading
Block, tangential single-excitation ultrasonic oval vibration energy converter, axial ultrasonic vibration transducer, dynamometer, horizontal sliding bearing plate, displacement meter, it is tangential plus
Carry piston, tangential hydraulic unit driver and axial hydraulic driver；The rigid frame bosom is vertically arranged lab space, should
Lab space bottom be horizontal plane, on the horizontal plane slide set horizontal sliding bearing plate, on horizontal sliding bearing plate by it is lower extremely
On be rigidly connected successively dynamometer, axial ultrasonic vibration transducer, tangential single-excitation ultrasonic oval vibration energy converter and axially loaded piece, in rigidity
The frame roof correspondence horizontal sliding vertically-mounted axial hydraulic driver of bearing plate, axial hydraulic actuator piston extends vertically into reality
Test space, axial hydraulic actuator piston end be from top to bottom rigidly connected successively dynamometer, axial ultrasonic vibration transducer,
Tangential single-excitation ultrasonic oval vibration energy converter and axially loaded piece；The front of the rigid frame, the back side, the left side respective level corresponding with the right side
One group of tangential hydraulic unit driver is installed, each group of tangential hydraulic unit driver includes 2 tangential hydraulic-drivens be arrangeding in parallel up and down
Device, tangential hydraulic unit driver pistons end connects one end of tangential loading piston, and the other end of tangential loading piston is rigid successively
Connection dynamometer and tangential loading blocks, all axially loaded pieces collectively form a rectangle loading space with tangential loading blocks.
Further, ball plate is installed, horizontal sliding bearing plate is arranged on ball plate in the lab space bottom water plane
On.
Further, be rigidly connected vibration isolator, horizontal sliding pressure-bearing between the axial hydraulic actuator piston and dynamometer
Be rigidly connected vibration isolator between plate and dynamometer.
Further, the piston guide rail being slidably matched with tangential pressurizing piston is installed in the rigid frame.
Further, the displacement for measuring tangential loading blocks and axially loaded piece of displacement is also equipped with the rigid frame
Measurement apparatus.
Further, institute's displacement measurement device is drawstring displacement meter, and the displacement meter is fixed on rigid frame inner side, displacement meter
Drawstring be fixed in axially loaded or tangential loading blocks by steady pin.
Further, joint rock sample, joint rock sample two blocks of rocks containing joint by centre are placed in the rectangle loading space
Block composition, rock sample axis and axially loaded axis collinear, and joint rock sample side wall surrounding is enclosed with cushion seal layer.
Further, the joint rock sample outer surface is uniformly coated with viscous gel products.The viscous gel products can be with
Using vaseline, waterglass or silica gel.
A kind of control system for rock joint Experimental Ultrasonic device under above-mentioned complex stress, including Data collecting conversion
Instrument, control signal change amplifying device, Data Processing in Experiment and stocking system and are provided with the computer of experiment software system
Terminal；The Data collecting conversion instrument is used to receiving displacement measuring device, dynamometer, tangential single-excitation ultrasonic oval vibration energy converter, axially super
The electric signal that the transmission of acoustic vibration transducer comes, and convert the electrical signal to the data signal of computer capacity identification；Terminal
The data signal that Data collecting conversion instrument is transmitted to is received, treatment point is carried out to the signal for receiving by experiment software system
Analysis, required experimental data is stored by after Data Processing in Experiment with stocking system treatment, and for experimental provision
Monitoring signals make feedback control information, and feedback control information is sent to control signal and changes amplifying device by terminal,
Change amplifying device according to feedback control information control signal controls each servo-hydraulic oil pump or ultrasonic signal to excite and be respectively
System is responded, and the servo-hydraulic oil pump is used to drive tangential hydraulic unit driver and axial hydraulic driver, ultrasonic signal to swash
Hair system is used to control tangential single-excitation ultrasonic oval vibration energy converter and axial ultrasonic vibration transducer.
Compared with prior art, the beneficial effects of the utility model are：Simple structure, it is reasonable in design, can arbitrarily control
Complex stress condition in system loading joint rock sample on joint plane, and the stress field state of the joint plane in subterranean body is simulated,
And carry out ultrasonic dynamic experiment.
Brief description of the drawings
Fig. 1 is joint rock sample stress analysis diagram；
Fig. 2 is sillar force analysis figure；
Fig. 3 is the vertical section structure schematic diagram of the utility model experimental provision fore-and-aft direction；
Fig. 4 is the vertical section structure schematic diagram of the utility model experimental provision left and right directions；
Fig. 5 is the partial enlarged drawing of the utility model experimental provision；
Fig. 6 is the displacement monitoring principle schematic of the utility model experimental provision；
Fig. 7 is joint samples loading principle schematic diagram；
Fig. 8 is the utility model control system schematic diagram.
Specific embodiment
The utility model is further described with reference to specific embodiments and the drawings.
The realization principle of rock joint Experimental Ultrasonic device is as follows under this complex stress：
As shown in figure 1, it with shaft section is foursquare rock sample that rock joint Experimental Ultrasonic device is under a kind of complex stress
Used as basic sample, be divided into two for rock sample with the presence of bathroclase face by test specimen middle part.The mechanics parameter of rock sample, joint plane
Form, the filling situation of joint plane can be selected according to specific needs, it can be the sampling at nature joint or multiple quarter,
Can be in order to research purpose and engineer produce.
The stress of joint rock sample, can be solely as shown in figure 1, the upper and lower sillar stress of joint plane is realized by single load maintainer
Vertical controlled loading.And because test specimen upper and lower end face stress should be balanced, therefore one of end face axial displacement in upper and lower end face
Suffer restraints, the other end is axially actively further applied load.Two sillars 1,2 upper and lower for rock sample joint, its surrounding is left before and after being subject to
Right four active forces, if setting up coordinate system o-xyz on the centre plane of joint plane, apply on each face of rock sample (sillar 1,2)
Plus load be named as f1x,f'1x, f1y,f'1y, f2x,f'2x, f2y,f'2yAnd f1z,f2z, and power thrusts are provided as with sample
The outer normal orientation of acting surface is for just.Therefore we can draw the stress intensity on joint plane by simple stress balance relation
For：
Wherein：A is projected area (or shaft section area of joint rock sample) of the joint plane on centre plane, f1xIt is sillar
Tangential x-axis forward direction loading force on 1；f′1xIt is the tangential reverse loading force of x-axis on sillar 1；f1yAdd for tangential y-axis is positive on sillar 1
Carry power；f′1yIt is the tangential reverse loading force of y-axis on sillar 1；f2xIt is the tangential x-axis forward direction loading force on sillar 2；f′2xIt is sillar 2
On the reverse loading force of tangential x-axis；f2yIt is the tangential y-axis forward direction loading force on sillar 2；f′2yFor tangential y-axis is reverse on sillar 2
Loading force；f1zIt is the top of sillar 1 axially downwardly loading force；f2zIt is the bottom of sillar 2 support force axially upwards；σnzFor on joint plane
Normal stress.For the shear stress direction on joint lower wall surface (sillar 2)：In x-axis direction shear stress τsxWith f1x,f'1xIn absolutely
It is consistent to the maximum direction of value；In y-axis direction shear stress τsyWith f1y,f'1yThe direction of middle maximum absolute value is consistent.
The force analysis of sillar：For sillar, the active force that it is subject to except apply load based in addition to, also
Existed by the shearing on joint plane and some torques of generation, as shown in Fig. 2 the power on the load that is subject to of sillar and joint plane
Balance, but joint plane can because shearing presence and produce some torques, these torques this be by the external force face of sillar
Torque that upper distributed force is produced is balanced, i.e., for example：
A·τsyD=A1M1+A·M2+A1M3
Wherein：D is EFFECTIVE RANGE (the torque arm of force), A1It is the lateralarea of sillar (due to the upper and lower rock of joint rock sample
Block size is identical, shaft section for square, therefore every one side of sillar 1,2 area can consider it is identical).M1,M3It is sillar
Torque on side, M2It is the torque on sillar end face, unit Pam；Here M1,M2,M3Direction be directed to vertical paper side
To.Because the size of rock joint rock sample is very limited, effective torque can be produced smaller, therefore needed for trimming moment
Distributed force it is also smaller；Along with the original crustal stress for being applied is general than larger, therefore the power of generation can be ignored here
The effect of square.
The stress state of sillar itself can be adjusted by loading in similar joint rock sample, with joint plane coordinate system as base
This coordinate system, the stress in sillar 1 is：
And the stress in sillar 2 is：
In view of the foregoing it is apparent that under a kind of complex stress rock joint Experimental Ultrasonic device have altogether need 5 pairs it is independent
Loading device carries out loading and can realize the complicated applied force of joint rock sample.
Therefore, as shown in Figures 3 to 8, the utility model provides rock joint Experimental Ultrasonic dress under a kind of complex stress
Put, including rigid frame 21, axially loaded piece 3, tangential loading blocks 4, tangential single-excitation ultrasonic oval vibration energy converter 5, axial ultrasonic vibration change
Can device 6, vibration isolator 8, dynamometer 7, ball plate 12, horizontal sliding bearing plate 11, displacement meter 13, tangential loading piston 10, tangential
Hydraulic unit driver 19 and axial hydraulic driver 20.
The bosom of the rigid frame 21 is vertically arranged lab space, and the lab space bottom level installs ball plate
12, slided on the ball plate 12 and horizontal sliding bearing plate 11 is set, rigidity connects successively from the bottom to top on horizontal sliding bearing plate 11
Connect vibration isolator 8, dynamometer 7, axial ultrasonic vibration transducer 6, tangential single-excitation ultrasonic oval vibration energy converter 5 and axially loaded piece 3.In rigidity
The top of the framework 21 vertically-mounted axial hydraulic driver 20 of corresponding horizontal sliding bearing plate 11, axial hydraulic actuator piston 9 is hung down
Directly stretch into lab space, the end of axial hydraulic actuator piston 9 be from top to bottom rigidly connected successively vibration isolator 8, dynamometer 7,
Axial ultrasonic vibration transducer 6, tangential single-excitation ultrasonic oval vibration energy converter 5 and axially loaded piece 3.The front of the rigid frame 21, the back of the body
Face, the left side is corresponding with the right side is each horizontally mounted one group of tangential hydraulic unit driver 19 (to being applied to load sillar 1, sillar 2),
Each group of tangential hydraulic unit driver 19 includes 2 tangential hydraulic unit drivers 19 be arrangeding in parallel up and down, and tangential hydraulic unit driver is lived
Fill in one end of the tangential loading piston 10 of 18 ends connection, the other end of tangential loading piston 10 is rigidly connected the He of dynamometer 7 successively
Tangential loading blocks 4, all axially loaded pieces 3 and tangential loading blocks 4 collectively form a rectangle loading space.
Piston guide rail 16 is installed, tangential loading piston 10 is slidably matched with piston guide rail 16 in the rigid frame 21, from
And tangential loading piston 10 is oriented to, it is ensured that it is only moved in horizontal tangential.
It is also equipped with being surveyed for measuring tangential loading blocks 4 and the axially loaded piece of displacement of 3 displacements on the rigid frame 21
Amount device.Institute's displacement measurement device is drawstring displacement meter 13, and the displacement meter 13 is fixed on the inner side of rigid frame 21, displacement meter 13
Drawstring be fixed in axially loaded 3 or tangential loading blocks 4 by steady pin 15.For reasonable Arrangement displacement meter 13, in rigidity
Leading block 14 is correspondingly arranged in framework 21, drawstring bypasses leading block 14 and then changes the direction of drawstring.
When being tested, for placing joint rock sample 1 in the rectangle loading space, joint rock sample 1 is contained by centre
Two plots of sillars composition at joint, rock sample axis and axially loaded axis collinear, two plots of sillars are overlapped and are placed on axially loaded piece 3
On.The side wall surrounding outer surface of the joint rock sample 1 is uniformly coated with viscous gel products, then wraps up cushion seal layer 2.It is described
Viscous gel products can be vaseline, waterglass or silica gel.The cushion seal layer 2 is using the soft material with certain toughness
Material is made, and its effect is joint rock sample is turned into an entirety for two pieces about 1, convenient to install, and sealing can be played to joint
Effect (particularly when joint is filled with fluid).Because cushion seal 2 matter soft mode amount of layer are low, and thinner thickness, Bu Huiying
Ring the loading of external force and the deformation at joint.
It is divided into (1) rigid frame structure, (2) loading structure below and three parts of (3) measurement monitoring of structures is come specifically
Solve this experimental provision.
(1) frame structure
Rigid frame 21 is the agent structure of support, the various equipment of fixation and offer counter-force in a whole set of experimental provision.Rigidity
Framework 21 is manufactured by steel, deformation rigidity of the deformation rigidity that it goes up in any direction much larger than joint rock sample 1.8
Tangential hydraulic unit driver 19 and 1 axial hydraulic driver 20 are rigidly fixed in rigid frame 21.Piston guide rail 16 is also rigid
The inner side of rigid frame 21 is fixed on, for constraining and guiding tangential loading piston 10 can only carry out horizontal movement.
(2) loading structure
Loading structure is broadly divided into static load loading structure and ultrasonic dynamic load loading structure.Static load loading is divided into axial dead load
Loading and tangential dead load.
Axial dead load is provided by the axial hydraulic driver 20 being rigidly fixed on rigid frame 21, and axial hydraulic drives
The axial hydraulic actuator piston 9 of device 20 does downwards compression motion.Vibration isolator has been sequentially connected in axial hydraulic actuator piston 9
8th, dynamometer 7, axial ultrasonic vibration transducer 6, tangential single-excitation ultrasonic oval vibration energy converter 5 and axially loaded piece 3, these parts are mutually firm
Property connection, and the deformation rigidity of axial deformation rigidity overall after connecting still greater than rock in itself.Axial compressive force is by above-mentioned
Structure, pressure is applied to the upper end of joint rock sample.And the counter-force of the bottom of joint rock sample 1 is by the reaction of bearing of bottom
Structure realizes that reaction of bearing structure includes axially loaded piece 3, tangential single-excitation ultrasonic oval vibration energy converter 5, axle being from top to bottom sequentially connected
To single-excitation ultrasonic oval vibration energy converter 6, dynamometer 7, vibration isolator 8 and horizontal sliding bearing plate 11, these parts are also to be rigidly connected to each other
An entirety is formed, and axial compressive force is transferred on ball plate 12 by horizontal sliding bearing plate 11, ball plate 12 is again by axle
Acted on rigid frame 21 to pressure.The reaction of bearing structure of the bottom of joint rock sample 1 can on ball plate 12 level from
By sliding, the generation of applying and the tangential deformation of collateral security joint tangential stress.
The generation of tangential dead load is produced by 8 tangential hydraulic unit drivers 19 positioned at the side of experimental provision four, when tangential liquid
When pressure driver 19 promotes tangential hydraulic unit driver piston 18 inwardly to move, tangential loading piston promotes tangential by connecting section 17
Loading piston 10 inwardly applies horizontal thrust, in dynamometer 7 and tangential loading blocks 4 by being connected on tangential loading piston 10
Thrust is delivered on joint rock sample 1.
The loading of ultrasonic dynamic load is main by two groups in the reaction of bearing structure of joint rock sample top loading structure and bottom
Transducer is realized.One group of transducer includes an axial ultrasonic vibration transducer 6 and a tangential structure of single-excitation ultrasonic oval vibration energy converter 5
Into.Axial ultrasonic vibration transducer 6 stimulates piezo-electric crystal to produce the change of axial direction by the voltage that ultrasonic signal activating system is produced
So as to produce ultrasonic vibration load, tangential single-excitation ultrasonic oval vibration energy converter 5 is stimulated shape by the voltage that ultrasonic signal activating system is produced
Piezo-electric crystal produces horizontal shear deformation so as to produce ultrasonic vibration load.And the effect of vibration isolator 8 is to absorb transducer to produce
Ultrasonic stress wave, prevent it from being propagated to rigid frame 21, reduce interference to vibration signal.The two of the top and the bottom of joint rock sample 1
Group transducer does not produce ultrasonic vibration load simultaneously, but when one of which transducer is used as vibration source, another set transducing
Device is converted into voltage signal as receiver, the vibration signal that will be received.
(3) monitoring of structures is measured
The measurement monitoring of structures of this experimental provision mainly has：Power measurement structure, displacement measurement structure, vibration measurement structure.
Power measurement structure：It is by the dynamometry on loading structure for monitoring the power acted on joint rock sample 1
Meter 4 is carried out, i.e., each loading blocks (including axially loaded piece 3 and tangential loading blocks 4) be nearby equipped with one it is independent
Dynamometer 7, one has 10 dynamometers 7.
Displacement measurement structure：Axial deformation and tangential deformation for measuring joint rock sample 1, are by installed in rigid frame
The drawstring displacement meter 13 of the inner surface of frame 21 realizes that the drawstring of displacement meter is directly anchored to axially loaded piece 3 by steady pin 15
In tangential loading blocks 4, it is easy to the axial deformation and tangential deformation of the direct measurement joint rock sample 1 of larger precision.In order to
Reasonable Arrangement drawstring 13 installation site in a device of displacement meter, the direction of drawstring is changed using leading block 14.
Vibration measurement structure：Including two groups of transducers, each group of transducer includes a He of axial ultrasonic vibration transducer 6
One tangential single-excitation ultrasonic oval vibration energy converter 5.The measurement of vibration signal is by axial ultrasonic vibration transducer 6 and tangential ultrasonic vibration
What transducer 5 was realized, two group transducers of the joint rock sample about 1, when vibration source is used as one group, then conduct connects another set
Receive sensor.
Referring to Fig. 8, the utility model additionally provides a kind of control of rock joint Experimental Ultrasonic device under above-mentioned complex stress
System processed, including Data collecting conversion instrument, control signal conversion amplifying device, Data Processing in Experiment and stocking system and installation
There is the terminal of experiment software system.The Data collecting conversion instrument is used to receive drawstring displacement meter, dynamometer, tangentially surpasses
The electric signal that acoustic vibration transducer, the transmission of axial ultrasonic vibration transducer come, and convert the electrical signal to computer capacity identification
Data signal.Terminal receives the data signal that Data collecting conversion instrument is transmitted to, and is docked by experiment software system
The signal for receiving carries out Treatment Analysis, and required experimental data is deposited by after Data Processing in Experiment with stocking system treatment
Storage, and monitoring signals for experimental provision make feedback control information, terminal sends to control feedback control information
Signal processed changes amplifying device, and change amplifying device according to feedback control information control signal controls each servo-fluid to press oil respectively
Pump or ultrasonic signal activating system are responded.The servo-hydraulic oil pump is used to drive tangential hydraulic unit driver and axial hydraulic
Driver, ultrasonic signal activating system is used to control tangential single-excitation ultrasonic oval vibration energy converter and axial ultrasonic vibration transducer.
After servo-hydraulic oil pump receives the control instruction that control signal conversion amplifying device sends, the fortune of control oil pump
Turn, oil pump controls the loading force size of tangential hydraulic unit driver and axial hydraulic driver further through oil circuit, so as to control to apply
Static force size on joint rock sample 1.When ultrasonic signal activating system receives what control signal conversion amplifying device sent
After control instruction, the voltage drive signals, the tangential single-excitation ultrasonic oval vibration energy converter on experimental provision such as frequency, amplitude that generation is specified
Or axial ultrasonic vibration transducer receives voltage drive signals and the ultrasonic vibration specified, vibration will be produced to produce stress wave to pass through
It is incident in joint rock sample 1 for axially loaded piece 3.
In order to preferably monitor the state of the experimental provision, hydrostatic sensor, temperature can also be on the apparatus installed and passed
Sensor, warning device etc., these sensors and device are connected with Data collecting conversion instrument, constitute except displacement, loading force and surpass
Other state monitoring informations beyond acoustic vibration.
The application method of this experimental provision is illustrated below by a specific experiment.
Experiment name：Influence research of the shear stress to rock joint longitudinal wave propagation characteristic under constant normal stress
Preparatory work of experiment material：Rock joint experiment is made, and joint rock sample outer surface is polished flat smooth, level cross-sectionn
It is square, the radial dimension deviation of upper and lower two sillar must not exceed 0.5mm, and the nonparallelism maximum in parallel boot face is no more than
0.05mm.And remain the intact of joint plane.
Experimental procedure：
Step1：Applied by the two pieces of sillar alignment about 1 of joint rock sample, and on the outer surface (on joint plane except lower wall surface)
Homogeneous viscous colloidal substance (such as vaseline, waterglass, silica gel) is smeared, and sample is uniformly wrapped up with cushion seal film；
Step2：Sample is placed on axially loaded piece 3 of the reaction of bearing structure of experimental provision bottom, and is ensured
Lower support counterforce structure axial line aligns with sample axial line with upper axial loading structure axial line；
Step3：Axial hydraulic driver 20 works so that axially loaded piece 3 moves downward, and sample is axially added
Stop when being loaded onto specified normal stress, and keep this stress constant；
Step4：Tangential hydraulic unit driver 19 works, and carries out horizontal addload to joint rock sample 1, conllinear two of same direction
The synchronous loading of tangential loading piston 10, and the loading force on real-time monitoring sample sillar so that the stress of sillar is all the time in sample
Balance is kept, and keeps the initial position of sample constant, until the stress state in sillar reaches required initial stress state；
Step5：Tangential hydraulic unit driver 19 on the sillar of joint rock sample bottom works, and carries out the applying of shear load.Under
In four tangential hydraulic unit drivers 19 on portion's sillar, the loading force increase of two of which so that sample detrusion is to required
Direction is carried out, and two other loading force keeps the loading force size in Step4 constant.At the same time, due on joint plane
Shearing force, the stress of joint rock sample middle and upper part sillar changes, by the real-time monitoring and feedback of displacement meter 13, servo
Four loading forces of tangential hydraulic unit driver 19 on control top sillar so that top sillar holding position in experimental provision
It is constant, and again such that the loading force size that is maintained in step4 of the tangential hydraulic unit driver 19 of two of which is constant (to maintain
Initial stress state).When shearing force reaches specified level, now by SERVO CONTROL holding joint plane upper stress and sillar
Stress it is constant.
Step6：The axial ultrasonic vibration transducer 6 on top apply needed for driving voltage vibrate it, simultaneously under
Portion's transducer receives vibration signal, and transmits signals to Data collecting conversion instrument.After the completion of ultrasonic tesint now, it is back to
In Step5, another joint shear stress level is loaded onto again by tangential hydraulic unit driver 19, ultrasound is then carried out again
Test.So move in circles, until experiment test is fully completed；
The whole process of experiment, each sensor synchronization real-time data collection, experimenter can synchronously see in a computer
Data are surveyed, original state is set and is controlled.
Data process＆analysis：Data by more than obtained by experiment are analyzed, it can be deduced that following beneficial data：Rock
The stress wave transmission feature at joint is in strain, peak after-tack stage and remaining stage before the elastic stage, peak at joint
Changing Pattern；And then can also be finally inversed by the Changing Pattern of the stiffness coefficient in each detrusion stage of joint plane.
This experimental provision " shadow of shear stress to rock joint stress wave propagation property under constant normal stress except can do
Ring research " outward, moreover it is possible to other polytype ultrasonic dynamic experiments are done, such as " shear stress should to rock joint under normal normal stiffness
The influence research of Reeb propagation characteristic ", " the raised abrasion of joint plane is to the influence research to rock joint stress wave propagation property ",
" influence research of the joint plane aperture to rock joint stress wave propagation property ", " joint plane material fills situation to rock joint
The influence research of stress wave propagation property ", " stress wave propagation property of joint plane stress direction and size to anisotropy joint
Influence research " etc..With boundless application prospect.
Preferred embodiment of the present utility model is the foregoing is only, is not used to limit the utility model, it is all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (9)
1. rock joint Experimental Ultrasonic device under a kind of complex stress, it is characterised in that：Including rigid frame, axially loaded piece,
Tangential loading blocks, tangential single-excitation ultrasonic oval vibration energy converter, axial ultrasonic vibration transducer, dynamometer, horizontal sliding bearing plate, displacement
Meter, tangentially loading piston, tangential hydraulic unit driver and axial hydraulic driver；
The rigid frame bosom is vertically arranged lab space, and the lab space bottom is horizontal plane, sliding on the horizontal plane
It is dynamic that horizontal sliding bearing plate, the dynamometer that is rigidly connected successively from the bottom to top on horizontal sliding bearing plate, axial ultrasonic vibration are set
Transducer, tangential single-excitation ultrasonic oval vibration energy converter and axially loaded piece, correspondence horizontal sliding bearing plate is pacified vertically at the top of rigid frame
Dress axial hydraulic driver, axial hydraulic actuator piston extends vertically into lab space, in axial hydraulic actuator piston end
From top to bottom be rigidly connected dynamometer, axial ultrasonic vibration transducer, tangential single-excitation ultrasonic oval vibration energy converter and axially loaded piece successively；
The front of the rigid frame, the back side, the left side be corresponding with the right side to be each horizontally mounted one group of tangential hydraulic unit driver, each
The tangential hydraulic unit driver of group includes 2 tangential hydraulic unit drivers be arrangeding in parallel up and down, and tangential hydraulic unit driver pistons end connects
Connect one end of tangential loading piston, the other end of tangential loading piston is rigidly connected dynamometer and tangential loading blocks successively, owns
Axially loaded piece collectively forms a rectangle loading space with tangential loading blocks.
2. rock joint Experimental Ultrasonic device under complex stress according to claim 1, it is characterised in that：The experiment is empty
Between ball plate is installed in bottom water plane, horizontal sliding bearing plate is arranged on ball plate.
3. rock joint Experimental Ultrasonic device under complex stress according to claim 2, it is characterised in that：The axial liquid
Be rigidly connected vibration isolator between pressure actuator piston and dynamometer, and be rigidly connected vibration isolation between horizontal sliding bearing plate and dynamometer
Device.
4. rock joint Experimental Ultrasonic device under complex stress according to claim 3, it is characterised in that：The rigid frame
The piston guide rail being slidably matched with tangential pressurizing piston is installed in frame.
5. rock joint Experimental Ultrasonic device under complex stress according to claim 4, it is characterised in that：The rigid frame
The displacement measuring device for measuring tangential loading blocks and axially loaded piece of displacement is also equipped with frame.
6. rock joint Experimental Ultrasonic device under complex stress according to claim 5, it is characterised in that：The displacement is surveyed
Amount device is drawstring displacement meter, and the displacement meter is fixed on rigid frame inner side, and the drawstring of displacement meter is fixed on axle by steady pin
To in loading or tangential loading blocks.
7. rock joint Experimental Ultrasonic device under the complex stress according to claim any one of 1-6, it is characterised in that：Institute
State rectangle loading space in place joint rock sample, by centre, two plots of sillars containing joint are constituted joint rock sample, rock sample axis and
Axially loaded axis collinear, and joint rock sample side wall surrounding is enclosed with cushion seal layer.
8. rock joint Experimental Ultrasonic device under complex stress according to claim 7, it is characterised in that：The joint rock
Sample outer surface is uniformly coated with viscous gel products.
9. under a kind of complex stress for described in the claims any one of 1-8 rock joint Experimental Ultrasonic device control
System, it is characterised in that：It is with storage including Data collecting conversion instrument, control signal conversion amplifying device, Data Processing in Experiment
Unite and be provided with the terminal of experiment software system；
The Data collecting conversion instrument is used to receive displacement measuring device, dynamometer, tangential single-excitation ultrasonic oval vibration energy converter, axial ultrasonic
The electric signal that vibration transducer transmission comes, and convert the electrical signal to the data signal of computer capacity identification；
Terminal receives the data signal that is transmitted to of Data collecting conversion instrument, by experiment software system to receiving
Signal carries out Treatment Analysis, and required experimental data is stored by after Data Processing in Experiment with stocking system treatment, and
Monitoring signals for experimental provision make feedback control information, and terminal sends to control signal feedback control information
Conversion amplifying device, changes amplifying device and controls each servo-hydraulic oil pump or super respectively according to feedback control information control signal
Acoustical signal activating system is responded, and the servo-hydraulic oil pump is used to drive tangential hydraulic unit driver and axial hydraulic to drive
Device, ultrasonic signal activating system is used to control tangential single-excitation ultrasonic oval vibration energy converter and axial ultrasonic vibration transducer.
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| CN201621059920 | 2016-09-18 | ||
| CN2016210599201 | 2016-09-18 |
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| CN206311421U true CN206311421U (en) | 2017-07-07 |
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| CN (1) | CN206311421U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442115A (en) * | 2016-09-18 | 2017-02-22 | 中国科学院、水利部成都山地灾害与环境研究所 | Rock joint ultrasonic experimental apparatus under complex stress and control system thereof |
| CN109465173A (en) * | 2018-10-23 | 2019-03-15 | 武汉大学 | A kind of rock mass structure shearing wave transducer and preparation method based on piezoelectric ceramic micro-displacement actuator |
-
2016
- 2016-12-19 CN CN201621397200.6U patent/CN206311421U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442115A (en) * | 2016-09-18 | 2017-02-22 | 中国科学院、水利部成都山地灾害与环境研究所 | Rock joint ultrasonic experimental apparatus under complex stress and control system thereof |
| CN106442115B (en) * | 2016-09-18 | 2024-02-13 | 中国科学院、水利部成都山地灾害与环境研究所 | Ultrasonic experimental device for rock joint under complex stress and control system thereof |
| CN109465173A (en) * | 2018-10-23 | 2019-03-15 | 武汉大学 | A kind of rock mass structure shearing wave transducer and preparation method based on piezoelectric ceramic micro-displacement actuator |
| CN109465173B (en) * | 2018-10-23 | 2020-04-24 | 武汉大学 | Rock mass structure shear wave transducer based on piezoelectric ceramic micro-displacement actuator and preparation method |
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