CN102410871B - Indoor measuring device for shearing wave velocity of soil body - Google Patents
Indoor measuring device for shearing wave velocity of soil body Download PDFInfo
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- CN102410871B CN102410871B CN 201110367598 CN201110367598A CN102410871B CN 102410871 B CN102410871 B CN 102410871B CN 201110367598 CN201110367598 CN 201110367598 CN 201110367598 A CN201110367598 A CN 201110367598A CN 102410871 B CN102410871 B CN 102410871B
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- wave velocity
- shearing wave
- signal acquisition
- acquisition instrument
- dynamic signal
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses an indoor measuring device for shearing wave velocity of a soil body. The device overcomes the defects of the conventional technology for measuring the shearing wave velocity. The device comprises a vibration generator, a dynamic signal acquisition instrument and a computer; the output end of the vibration generator is connected with a vibration table top which is positioned on the right side of the vibration generator and vibrates in the left and right direction; a model box is fixed on the vibration table top; at least one pair of pressure sensors corresponding to each other in the left and right direction is arranged on the inner sides of the left and right side walls of the model box; the output ends of the pressure sensors are connected with the input end of the dynamic signal acquisition instrument; and the output end of the dynamic signal acquisition instrument is connected with the input end of the computer. The device can be used for measuring the shearing wave velocity of a soil sample with large volume and does not need to disturb the soil sample during measuring, so that the propagation length of the shearing wave velocity is relatively definite; meanwhile, the device only has the shearing wave of the vibrating direction, so interference of waves of other forms does not exit; and the invention has the advantages that: the device is convenient and easy to operate and direct and simple in calculation.
Description
Technical field
The present invention relates to determinator, be specially a kind of indoor measurement device of shear wave velocity of soil body.
Background technology
At present, the assay method of soil body shear wave velocity mainly contains three kinds:
1. determine maximum shear modulus by resonant column test, and then the inverse shear wave velocity.This method shortcoming be the soil sample volume of surveying little, the shear wave velocity that obtains and the real shear wave velocity of the on-the-spot soil body have big difference, and this method is also the experimental formula that obtains by test with the formula of measured dynamic shear modulus inverse shear wave velocity, so error is also larger.
2. bending elements method is surveyed the shear wave velocity of soil sample.Bending unit need to 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 larger subjectivity, and the measuring error of bringing thus may reach 30%; The 3rd, what bending unit produced is a kind of polarized wave, the sensitive direction that transmits and receives the unit must be arranged unanimously during test, operates cumbersome.
3. utilize ultrasonic sensor to test the shear wave velocity of soil sample.Sensors with auxiliary electrode were usual thickness Shear-type piezoelectric ceramics PZT (lead zirconate titanate) wafer is made.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 sand this class of soil, compressional wave disturbs very serious.
Summary of the invention
The present invention provides a kind of indoor measurement device of shear wave velocity of soil body in order to solve the existing problem that there is above-mentioned weak point in the shear wave velocity technology of measuring.
The present invention adopts following technical scheme to realize: indoor measurement device of shear wave velocity of soil body, involving vibrations generator, dynamic signal acquisition instrument 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 vibration table, model casing left and right side wall inboard is provided with at least one pair of pressure transducer corresponding to left and right directions position, the output terminal of pressure transducer is connected with the input end of dynamic signal acquisition instrument, and the output terminal of dynamic signal acquisition instrument is connected with the input end of computing machine.During mensuration, at first the vibration signal by vibration machine emission specific acceleration and characteristic frequency is delivered to vibration table, make vibration table and on the model casing side-to-side vibrations together that soil sample is housed, soil sample also can be vibrated according to certain rules simultaneously, motion by the soil body, pressure transducer collects dynamic waveform, then the zero-time of the dynamic waveform by at least one pair of (a pair of be two) sensor is poor, determines the shear wave velocity of this soil sample.Computing formula is: λ=L/ △ t.λ is shear wave velocity, and L is the distance between 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 of the dynamic waveform of reference sensor and pressure transducer is poor more accurate, and the precision of determining the shear wave velocity of this soil sample further improves.
Reasonable in design of the present invention is reliable, can measure the shear wave velocity of larger volume soil sample, and does not need soil sample is carried out disturbance when measuring, and the spread length of shear wave velocity is relatively definite; This device only has 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 bringing.
Description of drawings
Fig. 1 is structural representation of the present invention.
In figure: 1-vibration machine, 2-dynamic signal acquisition instrument, 3-computing machine, 4-vibration table, 5-model casing, 6-pressure transducer, 7-reference sensor.
Embodiment
Indoor measurement device of shear wave velocity of soil body, involving vibrations generator 1, dynamic signal acquisition instrument 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 vibration table 4, the left and right sidewall of model casing 5 inboard is provided with at least one pair of pressure transducer 6 corresponding to left and right directions position, the output terminal of pressure transducer 6 is connected with the input end of dynamic signal acquisition instrument 2, and the output terminal of dynamic signal acquisition instrument 2 is connected with the input end of computing machine 3.Model casing 5 left side wall outside surfaces are provided with reference sensor 7.In specific implementation process, test pressure transducer 6 used and reference sensor 7 more flexible, select as required, can select to have the sensor that volume is little, frequency of operation is low, emitted energy is large.
Claims (2)
1. indoor measurement device of shear wave velocity of soil body, it is characterized in that: involving vibrations generator (1), dynamic signal acquisition instrument (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 vibration table (4), model casing (a 5) left side, the right side wall inboard is provided with at least one pair of pressure transducer (6) corresponding to left and right directions position, and every pair of pressure transducer (6) is separately positioned on the left and right sides of model casing (5) inboard, the output terminal of pressure transducer (6) is connected with the input end of dynamic signal acquisition instrument (2), the output terminal of dynamic signal acquisition instrument (2) is connected with the input end of computing machine (3).
2. indoor measurement device of shear wave velocity of soil body according to claim 1, it 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 |
|---|---|---|---|
| CN 201110367598 CN102410871B (en) | 2011-11-18 | 2011-11-18 | Indoor measuring device for shearing wave velocity of soil body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110367598 CN102410871B (en) | 2011-11-18 | 2011-11-18 | Indoor measuring device for shearing wave velocity of soil body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102410871A CN102410871A (en) | 2012-04-11 |
| CN102410871B true CN102410871B (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110367598 Expired - Fee Related CN102410871B (en) | 2011-11-18 | 2011-11-18 | Indoor measuring device for shearing wave velocity of soil body |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770656B (en) * | 2016-12-21 | 2023-02-21 | 西南交通大学 | Testing device for dynamic shear modulus of soil body in model test |
| US10646202B2 (en) * | 2017-01-23 | 2020-05-12 | Siemens Medical Solutions Usa, Inc. | Sheer speed imaging using coherence |
| CN107525577B (en) * | 2017-08-21 | 2023-04-07 | 兰州交通大学 | Longitudinal wave attenuation measuring device and method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4566084A (en) * | 1982-09-30 | 1986-01-21 | The United States Of America As Represented By The United States Department Of Energy | Acoustic velocity measurements in materials using a regenerative method |
| US5587968A (en) * | 1995-08-25 | 1996-12-24 | Western Atlas International, Inc. | Method for measuring the near-surface shear wave velocity for use in determining 3-component 3-D statics |
| US5598377A (en) * | 1995-10-04 | 1997-01-28 | Western Atlas International, Inc. | Method for correcting compressional velocity well logs for effects of gas in earth formations |
| US6154704A (en) * | 1998-11-17 | 2000-11-28 | Baker Hughes Incorporated | Method for correcting well log data for effects of changes in instrument velocity cable yo-yo |
| CN2733325Y (en) * | 2004-09-16 | 2005-10-12 | 廊坊开发区大地工程检测技术开发有限公司 | Suspension type wave speed logging device |
| CN101413823B (en) * | 2008-05-12 | 2011-01-19 | 浙江大学 | Portable piezoelectric ceramic bending element soil body shear wave speed test device |
| CN202329796U (en) * | 2011-11-18 | 2012-07-11 | 太原理工大学 | Indoor measurement device of shear wave velocity of soil body |
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- 2011-11-18 CN CN 201110367598 patent/CN102410871B/en not_active Expired - Fee Related
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Granted publication date: 20130605 Termination date: 20171118 |