CN208224169U - Measure the experimental rig of core sample shear wave velocity - Google Patents
Measure the experimental rig of core sample shear wave velocity Download PDFInfo
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- CN208224169U CN208224169U CN201820884493.3U CN201820884493U CN208224169U CN 208224169 U CN208224169 U CN 208224169U CN 201820884493 U CN201820884493 U CN 201820884493U CN 208224169 U CN208224169 U CN 208224169U
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- core sample
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- wave velocity
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- silicon steel
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Abstract
The utility model provides a kind of experimental rig for measuring core sample shear wave velocity, the AC signal generator of the device is electrically connected with power amplifier, power amplifier is electrically connected with half-wave rectification block, and wave velocity testing instrument is electrically connected with first sensor and second sensor respectively；First sensor and second sensor are fixed on core sample to be measured；Stable state vibration excitor includes silicon steel sheet frame, electromagnetic coil, vibration head and balance mass block；Silicon steel sheet frame is fixed on core examination to be measured end face, and electromagnetic coil is fixed in silicon steel sheet frame, and vibration head is connect with one end of silicon steel sheet frame by elastomeric element；Balance mass block is located at the other end of silicon steel sheet frame, and is fixed by the connecting rod and connect with vibration head；Electromagnetic coil is electrically connected with half-wave rectification block, can go out shear wave in core sample exciting to be measured, is sent to wave velocity testing instrument meter by first sensor and second sensor and is calculated transverse wave speed, structure is simple, at low cost, measurement is accurate.
Description
Technical field
The utility model belongs to Geotechnical Engineering field, is to be related to a kind of measurement core sample shear wave more specifically
The experimental rig of speed.
Background technique
Spread speed of the elastic wave (predominantly longitudinal wave and shear wave) in rock mass by the lithology of rock, cranny development degree,
The factors such as degree of rock weathering and elastic modulus of rock determine, are one important physical parameters of rock mass, can reflect the work of rock mass
Journey mechanical property.In engineering, from engineering site acquire core sample, then indoors measure core sample elastic wave at
For usually use the technological means of this field engineers and technicians.
Currently, generally measuring the elastic wave velocity of core sample by sound wave transmission method in laboratory, this method is usually benefit
With piezoelectric ceramics acoustic wave transducer and sonic apparatus the measurement velocity of longitudinal wave for being arranged in core sample both ends.Utilize same sound wave
When transmission measurement shear wave velocity, used acoustic wave transducer has special requirement to piezoelectric ceramic device, and processing is got up
Have more highly difficult, simultaneously because the Mintrop wave that not reaches at first of shear wave in measurement, when measurement is difficult to eliminate the influence of longitudinal wave, root
Judge that shear wave first arrival time has certain error according to test waveform, the shear wave velocity calculated according to first arrival time also has certain miss
Difference.Therefore, when carrying out shear wave velocity measurement to rock core using sound wave transmission method, exist and need to piezoelectric ceramics sound wave transducing
The component of device improves, and that there are difficulty of processing is big, and shear wave measurement error is larger, and the technology that measurement effect is difficult to ensure is asked
Topic.
Utility model content
It is existing to solve the purpose of this utility model is to provide a kind of experimental rig for measuring core sample shear wave velocity
When measuring using sound wave transmission method to shear wave velocity in technology, there is the component needed to piezoelectric ceramics acoustic wave transducer
It improves, and the technical issues of the difficulty of processing is big, and measurement error is larger, and measurement effect is difficult to ensure.
To achieve the above object, the utility model embodiment provides a kind of test dress for measuring core sample shear wave velocity
It sets, comprising: AC signal generator, power amplifier, half-wave rectification block, wave velocity testing instrument, stable state vibration excitor, the first sensing
Device and second sensor；
The AC signal generator is electrically connected with the power amplifier, the power amplifier and the halfwave rectifier
Module electrical connection, the wave velocity testing instrument are electrically connected with the first sensor and the second sensor respectively；Described first
Sensor and the second sensor are fixed on the core sample to be measured；
The stable state vibration excitor includes silicon steel sheet frame, electromagnetic coil, vibration head and balance mass block；The silicon steel sheet frame
Frame is fixed on the core sample to be measured end face by pedestal, and the electromagnetic coil is fixed in the silicon steel sheet frame, institute
Vibration head is stated to connect with one end of the silicon steel sheet frame by elastomeric element；The balance mass block is located at the silicon steel sheet frame
The other end of frame, and be fixed by the connecting rod and connect with the vibration head；The electromagnetic coil and half-wave rectification block electricity
Connection.
Further, the AC signal generator, power amplifier, half-wave rectification block and the setting of wave velocity testing instrument exist
In one instrument.
Further, the core sample to be measured is cylindrical type, and the stable state vibration excitor is fixed on the core examination to be measured
In the top end surface of sample.
Further, the center of gravity of the stable state vibration excitor is located on the central axis of cylindrical type core sample to be measured.
Further, the spacing between the first sensor and the second sensor is greater than 100 millimeters.
Further, the elastomeric element is rubber spring or metal spring.
Further, the electromagnetic coil is enameled wire electromagnetic coil.
Further, the first sensor and the second sensor are piezoelectric acceleration transducer.
The beneficial effect of the experimental rig of measurement core sample shear wave velocity provided by the utility model is: with existing skill
Art is compared, the experimental rig of the measurement core sample shear wave velocity of the utility model embodiment, including AC signal generator, function
Rate amplifier, half-wave rectification block, wave velocity testing instrument, stable state vibration excitor, first sensor and second sensor, AC signal hair
Raw device is electrically connected with power amplifier, and power amplifier is electrically connected with half-wave rectification block, the first sensing of wave velocity testing instrument difference
Device and second sensor electrical connection；First sensor and second sensor are fixed on core sample to be measured；Stable state exciting
Device includes silicon steel sheet frame, electromagnetic coil, vibration head and balance mass block；Silicon steel sheet frame is fixed on core to be measured by pedestal
On sample end face, electromagnetic coil is fixed in silicon steel sheet frame, and one end of vibration head and silicon steel sheet frame is connected by elastomeric element
It connects；Balance mass block is located at the other end for stating silicon steel sheet frame, and is fixed by the connecting rod and connect with vibration head；Electromagnetic coil with
Half-wave rectification block electrical connection, stable state vibration excitor is under the action of the half-wave AC signal that half-wave rectification block exports, Neng Gou
Exciting goes out shear wave in core sample to be measured, is sent to wave velocity testing instrument meter by first sensor and second sensor and calculates shear wave
Velocity of wave, structure is simple, at low cost, measurement is accurate.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this is practical new
Some embodiments of type for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural representation of the experimental rig of measurement core sample shear wave velocity provided by the embodiment of the utility model
Figure；
Fig. 2 is the structural schematic diagram of stable state vibration excitor provided by the embodiment of the utility model；
Fig. 3 is the schematic diagram of half-wave AC signal provided by the embodiment of the utility model.
Specific embodiment
In order to which technical problem to be solved in the utility model, technical solution and beneficial effect is more clearly understood, with
Lower combination accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that specific reality described herein
It applies example to be only used to explain the utility model, is not used to limit the utility model.
It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element
On one element or indirectly on another element.When an element is known as " being connected to " another element, it can
To be directly to another element or be indirectly connected on another element.
It is to be appreciated that term " length ", " width ", "upper", "lower", "front", "rear", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" "inner", "outside" is that orientation based on the figure or position are closed
System, is merely for convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features." multiple ", " several " are meant that two in the description of the present invention,
It is a or more than two, unless otherwise specifically defined.
Fig. 1 and Fig. 2 are please referred to, now the test of measurement core sample shear wave velocity provided by the embodiment of the utility model is filled
It sets and is illustrated.The experimental rig of the measurement core sample shear wave velocity, comprising: AC signal generator 10, power amplification
Device 20, half-wave rectification block 30, wave velocity testing instrument 40, stable state vibration excitor 50, first sensor 60 and second sensor 70.
Wherein, AC signal generator 10 is electrically connected with power amplifier 20, power amplifier 20 and half-wave rectification block
30 electrical connections, wave velocity testing instrument 40 are electrically connected with first sensor 60 and second sensor 70 respectively；First sensor 60 and
Two sensors 70 are fixed on core sample 80 to be measured.
Wherein, stable state vibration excitor 50 includes silicon steel sheet frame 51, electromagnetic coil 52, vibration head 53 and balance mass block 54.
Silicon steel sheet frame 51 is fixed on 80 end face of core sample to be measured by pedestal 56, and electromagnetic coil 52 is fixed on silicon steel sheet frame 51
Interior, vibration head 53 is connect with one end of silicon steel sheet frame 51 by elastomeric element 57, and elastomeric element 57 plays branch to vibration head 53
Support, the effect of guiding and limit.Balance mass block 54 is located at the other end of silicon steel sheet frame 51, and passes through with vibration head 53 and connect
Bar 55 is fixedly connected, and there are two the effects for balancing mass block 54, first is that being coupled as one with vibration head 53, increases vibration head 53
Weight, to match the quality of electromagnet being made of silicon steel sheet frame 51 and electromagnetic coil 52, make vibration head with by silicon steel sheet
When the electromagnet interaction that frame 51 and electromagnetic coil 52 are constituted, the amplitude of electromagnet is big as far as possible；Second is that offsetting vibration head 53
The torque that is generated in vibration head 53 with the electromagnet binding face being made of silicon steel sheet frame 51 and electromagnetic coil 52 of gravity, make to shake
Dynamic head 53 with when being interacted by the electromagnet that silicon steel sheet frame 51 and electromagnetic coil 52 are constituted, protect by two-part direction of vibration
Water holding is flat, generates horizontal direction shearing force to core sample 80 to be measured.Electromagnetic coil 52 is electrically connected with half-wave rectification block 30.
In the present embodiment, AC signal generator 10 can provide the AC signal of different frequency, and AC signal occurs
Device 10 can be made of AC power source and AC power source control switch.Power amplifier 20 is for mentioning AC signal generator 10
The AC signal of confession amplifies processing.Half-wave rectification block 30 is used for half to the processing of AC signal halfwave rectifier, after rectification
Wave AC signal is referring to Fig. 3.Wave velocity testing instrument 40 is Elastic Wave Velocity tester.Vibration head 53 can be soft magnetic materials production
's.
Requirement vibration frequency is higher when due to core sample 80 to be measured test, sensor is needed to have wider frequency band, because
This described first sensor 60 and second sensor 70 are small in size, light weight, high sensitivity, the piezoelectric type for measuring bandwidth
Acceleration transducer.Before test, first sensor 60 and second sensor 70 are pasted with adhesive (such as epoxy resin)
It is fixed on 80 side of core sample to be measured.
Silicon steel sheet frame 51 is fixed on 80 end face of core sample to be measured by pedestal 56, pedestal 56 and core sample to be measured
80 are pasted and fixed on 80 end face of core sample to be measured by adhesive (such as epoxy resin).
As can be seen from the above description, experimental rig provided by the embodiment of the utility model, electromagnetic coil and half-wave rectification block
Electrical connection, stable state vibration excitor is under the half-wave AC signal and elastomeric element collective effect that half-wave rectification block inputs, Neng Gou
Core sample exciting to be measured goes out shear wave, sends wave velocity testing for shear wave vibration signal by first sensor and second sensor
Instrument, and transverse wave speed is calculated, structure is simple, at low cost, measurement is accurate.
Further, with reference to Fig. 1 and Fig. 2, the AC signal generator 10, power amplifier 20, half-wave rectification block
30 and wave velocity testing instrument 40 be arranged in an instrument 90, can be convenient the experimental rig for measuring the core sample shear wave velocity
Transport and installation, improve testing efficiency.
Further, with reference to Fig. 1 and Fig. 2, the core sample 80 to be measured is cylindrical type, stable state vibration excitor 50 be fixed on to
It surveys in the top end surface of core sample 80.Preferably, the center of gravity of the stable state vibration excitor 50 is located at cylindrical type core sample to be measured
On 80 central axis.By the way that stable state vibration excitor to be fixed on to the top of core sample to be measured, and its center of gravity is waited for positioned at cylindrical type
It surveys on the central axis of core sample, enabling to core sample to be measured to vibrate, stable, amplitude is larger, improves the precision of test.
Further, with reference to Fig. 1 and Fig. 2, the spacing between the first sensor 60 and second sensor 70 is greater than 100
Millimeter is prevented apart from too small, and test error is larger.
Further, with reference to Fig. 1 and Fig. 2, the elastomeric element 57 is rubber spring or metal spring.
Further, with reference to Fig. 1 and Fig. 2, the electromagnetic coil 52 is enameled wire electromagnetic coil.
In the state of the art, wave velocity testing instrument is believed according to the shear wave that first sensor and second sensor are sent
Number method for calculating transverse wave speed is, the time difference that first sensor and second sensor receive shear wave signal is Δ t, first
The distance of sensor and second sensor is L, then the transverse wave speed of core sample
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, can be readily occurred in various
Equivalent modifications or substitutions, these modifications or substitutions should be covered within the scope of the utility model.Therefore, this is practical
Novel protection scope should be subject to the protection scope in claims.The above is only the preferred embodiment of the present invention and
, be not intended to limit the utility model, it is made within the spirit and principle of the present invention it is any modification, equally replace
It changes and improves, should be included within the scope of protection of this utility model.
Claims (9)
1. a kind of experimental rig for measuring core sample shear wave velocity, which is characterized in that put including AC signal generator, power
Big device, half-wave rectification block, wave velocity testing instrument, stable state vibration excitor, first sensor and second sensor；
The AC signal generator is electrically connected with the power amplifier, the power amplifier and the half-wave rectification block
Electrical connection, the wave velocity testing instrument are electrically connected with the first sensor and the second sensor respectively；First sensing
Device and the second sensor are fixed on core sample to be measured；
The stable state vibration excitor includes silicon steel sheet frame, electromagnetic coil, vibration head and balance mass block；The silicon steel sheet frame is logical
It crosses pedestal to be fixed on the core sample to be measured end face, the electromagnetic coil is fixed in the silicon steel sheet frame, the vibration
Dynamic head is connect with one end of the silicon steel sheet frame by elastomeric element；The balance mass block is located at the silicon steel sheet frame
The other end, and be fixed by the connecting rod and connect with the vibration head；The electromagnetic coil is electrically connected with the half-wave rectification block.
2. the experimental rig of measurement core sample shear wave velocity as described in claim 1, which is characterized in that the AC signal
Generator, power amplifier, half-wave rectification block and wave velocity testing instrument are arranged in an instrument.
3. the experimental rig of measurement core sample shear wave velocity as described in claim 1, which is characterized in that the core to be measured
Sample is cylindrical type, and the stable state vibration excitor is fixed in the top end surface of the core sample to be measured.
4. the experimental rig of measurement core sample shear wave velocity as claimed in claim 3, which is characterized in that the stable state exciting
The center of gravity of device is located on the central axis of cylindrical type core sample to be measured.
5. the experimental rig of measurement core sample shear wave velocity as described in claim 1, which is characterized in that first sensing
Spacing between device and the second sensor is greater than 100 millimeters.
6. the experimental rig of measurement core sample shear wave velocity as described in claim 1, which is characterized in that the elastomeric element
For rubber spring or metal spring.
7. the experimental rig of measurement core sample shear wave velocity as claimed in claim 5, which is characterized in that the electromagnetic coil
For enameled wire electromagnetic coil.
8. the experimental rig of measurement core sample shear wave velocity as described in claim 1, which is characterized in that first sensing
Device and the second sensor are piezoelectric acceleration transducer.
9. the experimental rig of measurement core sample shear wave velocity as described in claim 1, which is characterized in that the vibration head is
Soft magnetic materials is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820884493.3U CN208224169U (en) | 2018-06-08 | 2018-06-08 | Measure the experimental rig of core sample shear wave velocity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820884493.3U CN208224169U (en) | 2018-06-08 | 2018-06-08 | Measure the experimental rig of core sample shear wave velocity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208224169U true CN208224169U (en) | 2018-12-11 |
Family
ID=64504870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820884493.3U Expired - Fee Related CN208224169U (en) | 2018-06-08 | 2018-06-08 | Measure the experimental rig of core sample shear wave velocity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208224169U (en) |
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2018
- 2018-06-08 CN CN201820884493.3U patent/CN208224169U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181211 |