CN202329796U - Indoor measurement device of shear wave velocity of soil body - Google Patents
Indoor measurement device of shear wave velocity of soil body Download PDFInfo
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- CN202329796U CN202329796U CN2011204598482U CN201120459848U CN202329796U CN 202329796 U CN202329796 U CN 202329796U CN 2011204598482 U CN2011204598482 U CN 2011204598482U CN 201120459848 U CN201120459848 U CN 201120459848U CN 202329796 U CN202329796 U CN 202329796U
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- wave velocity
- measurement device
- shear wave
- indoor measurement
- vibration
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Abstract
The utility model particularly relates to an indoor measurement device of shear wave velocity of a soil body, which is used for solving the disadvantages existing in the current shear wave velocity measuring technology. The indoor measurement device comprises a vibration generator, a dynamic signal collector and a computer, wherein a vibration table surface positioned at the right side of the vibration generator and vibrating along a horizontal direction is connected to the output end of the vibration generator; a model box body is fixed on the vibration table surface; at least one pair of pressure sensors corresponding to each other in a horizontal direction is arranged at inner sides of left and right side walls of the model box body; the output ends of the pressure sensors are connected with the input end of the dynamic signal collector; and the output end of the dynamic signal collector is connected with the input end of the computer. The indoor measurement device disclosed by the utility model is capable of measuring shear wave velocity of a soil sample with a larger volume; furthermore, the soil sample does not need to be perturbed in the event of measuring; and propagation length of the shear wave velocity is relatively determined; simultaneously, the indoor measurement device only has shear waves in the vibration direction and does not have interference of waves in other forms, thus, the indoor measurement device has the advantages of being convenient and concise for operation and direct and simple for calculation.
Description
Technical field
The utility model relates to determinator, is specially a kind of soil body shear wave velocity indoor measurement device.
Background technology
At present, the assay method of soil body shear wave velocity mainly contains three kinds:
1. confirm the maximum shear modulus through resonant column test, and then the inverse shear wave velocity.This method shortcoming be the soil sample volume of surveying little; Shear wave velocity that obtains and the real shear wave velocity of the on-the-spot soil body have big difference; And this method also is the experimental formula that obtains through test with the formula of measured dynamic shear modulus inverse shear wave velocity, so error is also bigger.
2. the bending unit method is surveyed the shear wave velocity of soil sample.Bending unit need insert test specimen certain depth (being generally 3 mm), thereby causes disturbance certain in the insertion depth scope, has also caused the uncertainty of shearing wave spread length; In addition, the interference of near-field effect and stray wave makes the initial time of differentiating shearing wave have bigger subjectivity, and errors caused possibly reach 30% thus; The 3rd, what bending unit produced is a kind of polarized wave, must the sensitive direction that transmit and receive the unit be arranged unanimity during test, and it is cumbersome to operate.
3. utilize ultrasonic sensor to test the shear wave velocity of soil sample.This type of sensor usual thickness shear type piezoelectric ceramics PZT (lead zirconate titanate) wafer is processed.Because the thickness electromechanical coupling coefficient of PZT wafer is lower, the shearing wave emittance is little, simultaneously, also can produce compressional wave and disturb, and especially for the medium of soft clay, the high loss of saturated this type of loosening sand, compressional wave disturbs very serious.
Summary of the invention
The utility model provides a kind of soil body shear wave velocity indoor measurement device in order to solve the existing problem that there is above-mentioned weak point in the shear wave velocity technology of measuring.
The utility model is to adopt following technical scheme to realize: soil body shear wave velocity indoor measurement device; Involving vibrations generator, dynamic signal acquisition appearance and computing machine; The output terminal of vibration machine is connected with the vibration table that is positioned at its right side and vibrates along left and right directions; Be fixed with the model casing on the vibration table; Model casing left and right side wall inboard is provided with the corresponding pressure transducer at least one pair of left and right directions position, and the output terminal of pressure transducer links to each other with the input end of dynamic signal acquisition appearance, and the output terminal of dynamic signal acquisition appearance links to each other with input end and computer.During mensuration; At first the vibration signal by vibration machine emission specific acceleration and CF is delivered to vibration table, make vibration table with on the model casing side-to-side vibrations together that soil sample is housed, the while soil sample also can be vibrated according to certain rules; Motion through the soil body; Pressure transducer collects dynamic waveform, and the zero-time of the dynamic waveform through at least one pair of (a pair of be two) sensor is poor again, determines the shear wave velocity of this soil sample.Computing formula is: λ=L/ △ t.λ is a shear wave velocity, and L is the distance between the two sensors, and △ t is that the zero-time of the two sensors dynamic waveform that collects is poor.Overcome the problem that existing mensuration shear wave velocity technology exists.
Model casing left side wall outside surface is provided with reference sensor, and the zero-time difference of the dynamic waveform of reference sensor and pressure transducer is more accurate, and the precision of determining the shear wave velocity of this soil sample further improves.
The utility model reasonable in design is reliable, can measure the shear wave velocity of larger volume soil sample, and need not carry out disturbance to soil sample when measuring, and the spread length of shear wave velocity is more definite relatively; This device has only the shearing wave of direction of vibration simultaneously, does not have the interference of other forms of ripple, has easy to operately, simple and direct, calculates directly, simple advantage, thereby can reduce to test the error of being brought.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Among the figure: 1-vibration machine, 2-dynamic signal acquisition appearance, 3-computing machine, 4-vibration table, 5-model casing, 6-pressure transducer, 7-reference sensor.
Embodiment
Soil body shear wave velocity indoor measurement device; Involving vibrations generator 1, dynamic signal acquisition appearance 2 and computing machine 3; The output terminal of vibration machine 1 is connected with the vibration table 4 that is positioned at its right side and vibrates along left and right directions; Be fixed with model casing 5 on the vibration table 4; Model casing 5 left and right sidewall inboards are provided with the corresponding pressure transducer 6 at least one pair of left and right directions position, and the output terminal of pressure transducer 6 links to each other with the input end of dynamic signal acquisition appearance 2, and the output terminal of dynamic signal acquisition appearance 2 links to each other with the input end of computing machine 3.Model casing 5 left side wall outside surfaces are provided with reference sensor 7.In the practical implementation process, it is relatively more flexible with reference sensor 7 to test used pressure transducer 6, selectes as required, can select to have the sensor that volume is little, frequency of operation is low, emitted energy is big.
Claims (2)
1. soil body shear wave velocity indoor measurement device; It is characterized in that: involving vibrations generator (1), dynamic signal acquisition appearance (2) and computing machine (3); The output terminal of vibration machine (1) is connected with the vibration table (4) that is positioned at its right side and vibrates along left and right directions; Be fixed with model casing (5) on the vibration table (4); The left and right sidewall of model casing (5) inboard is provided with the corresponding pressure transducer (6) at least one pair of left and right directions position, and the output terminal of pressure transducer (6) links to each other with the input end of dynamic signal acquisition appearance (2), and the output terminal of dynamic signal acquisition appearance (2) links to each other with the input end of computing machine (3).
2. soil body shear wave velocity indoor measurement device according to claim 1 is characterized in that: model casing (5) left side wall outside surface is provided with reference sensor (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204598482U CN202329796U (en) | 2011-11-18 | 2011-11-18 | Indoor measurement device of shear wave velocity of soil body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204598482U CN202329796U (en) | 2011-11-18 | 2011-11-18 | Indoor measurement device of shear wave velocity of soil body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202329796U true CN202329796U (en) | 2012-07-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204598482U Expired - Lifetime CN202329796U (en) | 2011-11-18 | 2011-11-18 | Indoor measurement device of shear wave velocity of soil body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202329796U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410871A (en) * | 2011-11-18 | 2012-04-11 | 太原理工大学 | Indoor measuring device for shearing wave velocity of soil body |
| CN106351266A (en) * | 2016-09-21 | 2017-01-25 | 太原理工大学 | Large laminar shear model box with external electromagnetic resistance reduction devices |
-
2011
- 2011-11-18 CN CN2011204598482U patent/CN202329796U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410871A (en) * | 2011-11-18 | 2012-04-11 | 太原理工大学 | Indoor measuring device for shearing wave velocity of soil body |
| CN106351266A (en) * | 2016-09-21 | 2017-01-25 | 太原理工大学 | Large laminar shear model box with external electromagnetic resistance reduction devices |
| CN106351266B (en) * | 2016-09-21 | 2018-06-19 | 太原理工大学 | Shear model box is laminated in a kind of the large-scale of external electromagnetic damping device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120711 Effective date of abandoning: 20130605 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20120711 Effective date of abandoning: 20130605 |
|
| RGAV | Abandon patent right to avoid regrant |