CN214844595U - Device for accurately measuring natural vibration frequency of rock-fill body - Google Patents
Device for accurately measuring natural vibration frequency of rock-fill body Download PDFInfo
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- CN214844595U CN214844595U CN202121052158.5U CN202121052158U CN214844595U CN 214844595 U CN214844595 U CN 214844595U CN 202121052158 U CN202121052158 U CN 202121052158U CN 214844595 U CN214844595 U CN 214844595U
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- 239000004576 sand Substances 0.000 claims abstract description 15
- 239000004519 grease Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 238000012360 testing method Methods 0.000 abstract description 8
- 239000011435 rock Substances 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
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Abstract
The utility model provides a device for accurately measuring the natural vibration frequency of a rockfill body, which comprises a rockfill body, an acquisition processor, a vibrator and a frequency controller; coarse sand, a base plate and an additional mass block are sequentially paved on the rockfill body, and a first vibration pickup is stuck on the additional mass block; a vibrator is arranged on the rockfill body, and a second vibration pickup device is anchored at the upper end of the vibrator; the first vibration pickup is connected with the acquisition processor through a first cable, the acquisition processor is connected with the second vibration pickup through a second cable, and the vibrator is connected with the frequency controller through a third cable. The utility model discloses can compensate the not enough of additional mass method test rockfill body natural vibration frequency at present stage, can reach the purpose of accurate test.
Description
Technical Field
The utility model relates to a device of accurate determination rockfill body natural vibration frequency belongs to engineering geophysical prospecting technical field.
Background
In the filling process of the dam body, a density test is carried out by using an additional mass method so as to control the filling quality. In the prior art, a heavy hammer is used for hammering the ground by a free falling body with a fixed height, so that a combined body consisting of a backing plate, an additional mass block, coarse sand below the backing plate and a rock pile body is excited to vibrate, and the natural vibration frequency of the combined body is measured. The method requires quite abundant theoretical and practical experiences of testers, is easy to misjudge, and limits the popularization and application of the method.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a device of accurate determination rockfill body natural frequency that shakes, this device of accurate determination rockfill body natural frequency that shakes can compensate the not enough of additional mass method test rockfill body natural frequency that shakes at present stage, reaches the purpose of accurate test.
The utility model discloses a following technical scheme can realize.
The utility model provides a device for accurately measuring the natural vibration frequency of a rockfill body, which comprises a rockfill body, an acquisition processor, a vibrator and a frequency controller; coarse sand, a base plate and an additional mass block are sequentially paved on the rockfill body, and a first vibration pickup is stuck on the additional mass block; a vibrator is arranged on the rockfill body, and a second vibration pickup device is anchored at the upper end of the vibrator; the first vibration pickup is connected with the acquisition processor through a first cable, the acquisition processor is connected with the second vibration pickup through a second cable, and the vibrator is connected with the frequency controller through a third cable.
The rock pile body, the coarse sand, the base plate and the additional mass block form a vibration assembly.
The first vibration pickup is adhered with the additional mass block through grease.
The vibrator is positioned on one side of the coarse sand.
The additional mass blocks are provided with a plurality of blocks, and each block has the same specification.
The first vibration pickup and the second vibration pickup are both low-frequency vibration pickups, and the frequency range is 1-100 Hz.
The frequency of the frequency controller changes from small to large or from large to small in sequence, the frequency range is 20-100 Hz, the change interval of the frequency is 0.2Hz, and the vibration time of each stage is 3-5 seconds.
The distance between the vibrator and the edge of the base plate is 20-50 cm.
The beneficial effects of the utility model reside in that: the method can make up the deficiency of testing the natural vibration frequency of the rockfill body by the additional mass method at the present stage, and can achieve the purpose of accurate testing.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
in the figure: 1-rockfill, 2-coarse sand, 3-backing plates, 4-additional mass blocks, 5-first vibration detectors, 6-first cables, 7-acquisition processors, 8-second cables, 9-second vibration detectors, 10-vibrators, 11-third cables and 12-frequency controllers.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
Example 1
The device for accurately measuring the natural vibration frequency of the rock-fill body as shown in figure 1 comprises the rock-fill body 1, an acquisition processor 7, a vibrator 10 and a frequency controller 12; the gravel body 1 is sequentially paved with coarse sand 2, a backing plate 3 and an additional mass block 4, and a first vibration pickup 5 is stuck on the additional mass block 4; a vibrator 10 is arranged on the rockfill body 1, and a second vibration pickup 9 is anchored at the upper end of the vibrator 10; the first vibration pickup 5 is connected with the acquisition processor 7 through a first cable 6, the acquisition processor 7 is connected with the second vibration pickup 9 through a second cable 8, and the vibrator 10 is connected with the frequency controller 12 through a third cable 11.
Example 2
The protocol of example 1 was followed and:
the rock-fill body 1, the coarse sand 2, the backing plate 3 and the additional mass block 4 form a vibration assembly, the thickness of the coarse sand is about 2cm, the thickness of the backing plate is about 2cm, and the backing plate and the additional mass block are flat.
Example 3
The protocol of example 1 was followed and:
the first vibration pickup 5 is attached to the additional mass block 4 by grease, and the first vibration pickup 5 is attached at the center of the additional mass block 4.
Example 4
The protocol of example 1 was followed and:
the vibrator 10 is located at one side of the coarse sand 2.
Example 5
The protocol of example 1 was followed and:
the additional mass 4 has a plurality of pieces, and each piece has the same size.
Example 6
The protocol of example 1 was followed and:
the first vibration pickup 5 and the second vibration pickup 9 are both low-frequency vibration pickups, and the frequency range is 1-100 Hz.
Example 7
The protocol of example 1 was followed and:
the frequency of the frequency controller 12 changes from small to large or from large to small in sequence, the frequency range is 20-100 Hz, the change interval of the frequency is 0.2Hz, and the vibration time of each stage is 3-5 seconds.
Example 8
The protocol of example 1 was followed and:
the distance between the vibrator 10 and the edge of the base plate 3 is 20-50 cm.
Example 9
Based on the above embodiment, specifically:
when the additional mass method test is carried out, the coarse sand 2, the base plate 3 and an additional mass block 4 are sequentially paved on the rockfill body 1 to form a combined body; pasting a first vibration pickup 5 on the additional mass block 4 by using butter, connecting the first vibration pickup 5 with an acquisition processor 7 by using a first cable 6, placing a vibrator 10 on the rockfill body 1 beside the base plate 3, anchoring a second vibration pickup 9 on the vibrator 10, connecting the second vibration pickup 9 with the acquisition processor 7 by using a second cable 8, and connecting the vibrator 10 with a frequency controller 12 by using a third cable 11.
And starting the frequency controller 12 to make the vibrator 10 vibrate from small to large or from large to small according to the frequency, and causing the combined body consisting of the rockfill 1, the coarse sand 2, the backing plate 3 and the additional mass block 4 to vibrate, when the vibration frequency of the vibrator 10 is the same as the self-vibration frequency of the combined body, resonance is caused, at the moment, the instantaneous frequencies of the first vibration pickup 5 and the second vibration pickup 9 are equal, the instantaneous amplitude of the first vibration pickup 5 is increased, the vibration waveforms of the first vibration pickup 5 and the second vibration pickup 9 are simultaneously received through the acquisition processor 7, and the instantaneous frequencies and the instantaneous amplitudes of the two groups of waveforms are calculated in real time, wherein the frequency corresponding to the amplitude is the self-vibration frequency, namely, when the instantaneous frequencies of the two waveforms are the same (the first vibration pickup 5 and the second vibration pickup 9) and the instantaneous amplitude (maximum) of the first vibration pickup 5 is increased, the frequency corresponding to the amplitude is the self-vibration frequency f 1.
And (3) increasing the number of the additional mass blocks 4, and when the number of the mass blocks is 2, 3, 4 and 5, respectively measuring the corresponding natural vibration frequencies f2, f3, f4 and f5 according to the method, so that the natural vibration frequency and the density of the rock mass can be obtained according to the calculation principle of the additional mass method.
Claims (8)
1. The utility model provides an accurate survey device of rockfill natural vibration frequency, includes the rockfill (1), gathers processor (7), vibrator (10), frequency controller (12), its characterized in that: coarse sand (2), a base plate (3) and an additional mass block (4) are sequentially paved on the rockfill body (1), and a first vibration pickup (5) is stuck on the additional mass block (4); a vibrator (10) is arranged on the rockfill body (1), and a second vibration pickup (9) is anchored at the upper end of the vibrator (10); the first vibration pickup device (5) is connected with the acquisition and processing machine (7) through a first cable (6), the acquisition and processing machine (7) is connected with the second vibration pickup device (9) through a second cable (8), and the vibrator (10) is connected with the frequency controller (12) through a third cable (11).
2. The apparatus for accurately determining the natural frequency of vibration of a rockfill body according to claim 1, wherein: the rock-fill body (1), the coarse sand (2), the backing plate (3) and the additional mass block (4) form a vibration assembly.
3. The apparatus for accurately determining the natural frequency of vibration of a rockfill body according to claim 1, wherein: the first vibration pickup (5) is adhered with the additional mass block (4) through grease.
4. The apparatus for accurately determining the natural frequency of vibration of a rockfill body according to claim 1, wherein: the vibrator (10) is positioned on one side of the coarse sand (2).
5. The apparatus for accurately determining the natural frequency of vibration of a rockfill body according to claim 1, wherein: the additional mass blocks (4) are provided with a plurality of blocks, and the sizes of the blocks are the same.
6. The apparatus for accurately determining the natural frequency of vibration of a rockfill body according to claim 1, wherein: the first vibration pickup device (5) and the second vibration pickup device (9) are both low-frequency vibration pickup devices, and the frequency range is 1-100 Hz.
7. The apparatus for accurately determining the natural frequency of vibration of a rockfill body according to claim 1, wherein: the frequency of the frequency controller (12) changes from small to large or from large to small in sequence, the frequency range is 20-100 Hz, the change interval of the frequency is 0.2Hz, and the vibration time of each stage is 3-5 seconds.
8. The apparatus for accurately determining the natural frequency of vibration of a rockfill body according to claim 1, wherein: the distance between the vibrator (10) and the edge of the base plate (3) is 20-50 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121052158.5U CN214844595U (en) | 2021-05-17 | 2021-05-17 | Device for accurately measuring natural vibration frequency of rock-fill body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121052158.5U CN214844595U (en) | 2021-05-17 | 2021-05-17 | Device for accurately measuring natural vibration frequency of rock-fill body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214844595U true CN214844595U (en) | 2021-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121052158.5U Active CN214844595U (en) | 2021-05-17 | 2021-05-17 | Device for accurately measuring natural vibration frequency of rock-fill body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214844595U (en) |
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2021
- 2021-05-17 CN CN202121052158.5U patent/CN214844595U/en active Active
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