CN107870201A - A kind of air bubble mix light-textured soil embankment lossless detection method - Google Patents
A kind of air bubble mix light-textured soil embankment lossless detection method Download PDFInfo
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- CN107870201A CN107870201A CN201711102661.5A CN201711102661A CN107870201A CN 107870201 A CN107870201 A CN 107870201A CN 201711102661 A CN201711102661 A CN 201711102661A CN 107870201 A CN107870201 A CN 107870201A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The present invention relates to a kind of air bubble mix light-textured soil embankment lossless detection method, is embankment detection field.Including following steps：(1) measuring points placement；(2) ultrasonic signal gathers；(3) field data amendment；(4) sound parameter back analysis；(5) embankment quality judges.The present invention provides a kind of simple and practical method for the detection of air bubble mix light-textured soil embankment quality, and the quality testing to other species embankment engineerings equally has very strong reference function.
Description
Technical field
The present invention is embankment detection field, and in particular to a kind of air bubble mix light-textured soil embankment scene lossless detection method,
More particularly, to a kind of air bubble mix light-textured soil embankment quality synthetic determination method based on sound wave transmission method.
Background technology
As the air bubble mix light-textured soil of new rock-soil material, end of the bridge transition section has been widely used in it, containing structure
The special Soft Roadbed such as thing section and Deep Thick Soft Ground section fills.Air bubble mix light-textured soil is because of its good property, as road
Dike filler has the advantages of very more, and has been proven in practice.However, from native different, the bubble of traditional embankment fill material
Mix light-textured soil engineering property is gradually decayed with the passage of time, this be due to cement products over time, its physics
Mechanical property constantly reduces, the reason developed towards the direction for being unfavorable for embankment stability.In addition, on failure mode, tradition
Embankment and air bubble mix light-textured soil embankment are widely different, and the former is progressive destruction, and the latter is sudden avalanche.Therefore, such as
What can be carried out permanently effective detection to air bubble mix light-textured soil embankment, be on the premise of not large-scale damage pavement structure
Air bubble mix light-textured soil is as embankment fill material urgent problem to be solved.
The content of the invention
To solve the above problems, the present invention is proposed using sound wave transmission method detection air bubble mix light-textured soil embankment engineering property
Method.This method is simple to operate, explicit physical meaning, can carry out long-term dynamics monitoring to air bubble mix light-textured soil embankment, fill out
The aspect blank of embankment detection has been mended, the quality testing for air bubble mix light-textured soil embankment and earthfill road embankment, has been had good
Directive significance.
In order to realize the above object the present invention adopts the following technical scheme that：
A kind of air bubble mix light-textured soil embankment lossless detection method, comprises the following steps：
The measuring points placements of STEP 1：Before air bubble mix light-textured soil embankment pours, sound detecting pipe is laid in advance in section to be measured；
Or the embedded sound detecting pipe that drilled after the completion of paving.
The ultrasonic signals of STEP 2 gather：After treating that embankment road surface pours completion, every group of sound is gathered using sound wave transmission method
The sound parameter of air bubble mix light-textured soil between test tube, including when ultrasonic velocity, sound, wave amplitude etc..
The field data amendments of STEP 3：According to it is detected when temperature, moisture content, depth it is different, to its ultrasonic velocity
It is modified.
The sound parameter back analysis of STEP 4：Scene is measured and by the ultrasonic velocity of amendment, substitutes into formula Ed=v2ρ (formulas
In, EdFor the dynamic modulus of elasticity of air bubble mix light-textured soil, v is the air bubble mix light-textured soil ultrasonic velocity measured, and ρ mixes for bubble
Close light soil density), calculate the dynamic modulus of elasticity for being tested air bubble mix light-textured soil embankment.Using the dynamic modulus of elasticity calculated,
Caused ultrasonic velocity in simulated bubble mix light-textured soil, contrasting detection result and numerical simulation result, checking test block sound ginseng
The accuracy of measurements.
The embankment qualities of STEP 5 judge：Scene is measured and by the ultrasonic velocity of amendment, and the sound that scene measures
When, the sound parameter such as wave amplitude, contrast experiment room Plays conserve the similarly hereinafter ultrasonic velocity of intensity test block, sound duration and amplitude curve
Form, judge the quality of embankment.
Preferably, point layout is in the maximum position of vehicle flowrate.
Preferably, different according to embankment length, every 50~100m sets one group of measuring point.
Preferably, the maximum spacing of every group of measuring point must not exceed 50cm.
Preferably, it is necessary to assure the perpendicularity of two sound detecting pipes is less than 1 ‰, and measures sound detecting pipe section to be measured with steel tape
Between clear distance.
Preferably, sound detecting pipe should be higher by air bubble mix light-textured soil embankment, and less than at the top of asphalt surface course, insert the portion of surface layer
Divide and tight, capping closing is wrapped up with pea gravel concreten.
Preferably, the ultrasonic velocity data measured need the amendment into trip temperature, moisture content, depth, and its relational expression is：
v1=v0+Tv+wv+Hv；
TvIt is temperature correction coefficient, expression formula is：
wvIt is moisture content correction factor, expression formula is：
HvIt is adjusting for depth coefficient, expression formula is：
In formula, v1It is revised ultrasonic velocity, v0It is the ultrasonic velocity measured；a1a2a3b1b2b3c2c3It is related
The coefficient of correction factor, it is fitted to obtain by laboratory test, t1For scene temperature, t0For laboratory temperature, w1It is aqueous for live embankment
Rate, w0For laboratory test block moisture content, σ1The maximum principal stress of section, P are detected for live embankmentaFor atmospheric pressure.
Preferably, the influence of Poisson's ratio is not considered when calculating dynamic modulus of elasticity, i.e. formula can be reduced to：
Ed=v2ρ；
E in formuladFor the dynamic modulus of elasticity of air bubble mix light-textured soil, v is the air bubble mix light-textured soil ultrasonic velocity measured,
ρ is air bubble mix light-textured soil density.
Back analysis preferably for air bubble mix light-textured soil is counted using professional finite element software ABAQUS, ANSYS
Calculate.
The light soil ultrasonic velocity v that back analysis preferably for light soil simulatessWith ultrasonic velocity correction value
v1Between error must not exceed 5%, otherwise should detect embankment ultrasonic velocity again.
Preferably, air bubble mix light-textured soil embankment Non-Destructive Testing comprehensive value model is divided into four ranks：
Wherein：Standard deviation is
In formula,It is normal concrete velocity of wave average value (km/s)；σvIt is normal concrete velocity of wave standard deviation；viIt is i-th
Measuring point value of wave speed (km/s)；N is measuring point number.
Relative to prior art, the application achieves following beneficial effect：
At present, more advanced embankment lossless detection method has：GPR detection technique, spectrum analysis detection technique,
High Density Resistivity Imaging Technique, IR Thermograph etc..Ground penetrating radar exploration is because its is quick, convenient, more accurate, company
The advantages of continuous detection, it is widely used in embankment detection.But air bubble mix light-textured soil is placement in layers, every
When layer fills, bar-mat reinforcement has all been laid between layers.The electromagnetic wave that bar-mat reinforcement is launched GPR has shielding action, so
GPR is not appropriate for the detection of bubble lightweight dirt road dike；And spectrum analysis technique is arranged along operation needs every time due to it
Very long survey line, at the same it mainly with waveform come reflect embankment inner cavity, cavity distribution situation, for embankment engineering
The detection of energy parameter such as density, modulus of elasticity, Strength Changes, and do not apply to.High Density Resistivity can be completed more in the wild
The observation of kind electrode assembly, therefore can adapt to various geological prospecting tasks.High-density electric is also more using such as at present
In the formation characteristics visualization of geological prospecting one kind large scale, the detection for this details index of embankment quality, precision can not
It is guaranteed.IR Thermograph detection device price is higher, complex operation, ambient temperature on its testing result influence compared with
Greatly, therefore, it is also not suitable for the quality testing of Expressway Embankment.
The present invention is easy to operate, detection is rapid, explicit physical meaning, not by external environment change or other constraintss
Influence, can go deep into the case where not damaging embankment inside embankment, the accurate ultrasonic acoustic parameter for obtaining light soil embankment, be
Unit in charge of construction accurately holds its construction quality and provides guarantee；After road operation, the measuring point buried in construction still is able to normally carry
Data are detected for sound wave transmission method, the overall intensity of embankment, rigidity, life requirement is held for dynamic, improves road operation pipe
Reason efficiency is made contributions.By the application of foregoing invention, engineering life cycle management cost, remarkable in economical benefits can be significantly saved.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method；
Fig. 2 is to carry out air bubble mix light-textured soil embankment ultrasound examination schematic diagram using nonmetallic ultrasound measuring instrument.
Wherein：1-nonmetallic ultrasound measuring instrument；2-nonmetallic ultrasound measuring instrument transmitting radial transducer；3-nonmetallic
Ultrasound measuring instrument receives radial transducer；4-sound detecting pipe；5-sounding pipe holder；6-air bubble mix light-textured soil embankment；7-road
Dike bottom solum；8-cement mortar；9-road deck；10-pea gravel concreten；11-sounding lid；12-tripod；
13-lifting tackle；14-signal wire.
Embodiment
Embodiment one
A kind of air bubble mix light-textured soil embankment scene lossless detection method of the present invention, it comprises the following steps：
Measuring points placement.As depicted in figs. 1 and 2, before air bubble mix light-textured soil embankment 6 pours, measuring point is installed on roadbed.
The position of sound detecting pipe installation, one group should be installed along the maximum vertical section of following operation road traffic, every 50~100m.Every group
Measuring point includes two sound detecting pipes 4, and the ultimate range of sound detecting pipe must not exceed 50cm.Sound detecting pipe should be inserted in embankment bottom solum 7
Light soil embankment basal surface position is filled up to more than 20cm, and with cement mortar 8.Upwards during installation sound detecting pipe 4, in every sound detecting pipe
3 metal sound detecting pipe supports 5 are installed outside 4, to keep its perpendicularity and stability, in order to avoid because of construction in light soil casting process
Reason bends sound detecting pipe, influences testing result.After installation, it should check whether the perpendicularity of every sound detecting pipe is less than 1 ‰,
If the perpendicularity of sound detecting pipe is more than 1 ‰ less than 5 ‰, the clear distance between section to be measured is measured with steel ring chi, if sound detecting pipe
Perpendicularity is more than 5 ‰, then should extract and reinstall.Sound detecting pipe should be higher by embankment, treat that air bubble mix light-textured soil embankment pours completion,
Inserted when road deck 9 is mated formation in road deck, oral area pea gravel concreten 10 wraps up tightly, and adds sounding lid 11 to treat
With.
Ultrasonic signal gathers.After treating that embankment road surface pours completion, into scene, tripod 12 is installed, prepares detection.
Check whether nonmetallic ultrasound measuring instrument 1 is normal before detection, then open sounding lid 11, clear water is added in sound detecting pipe.Will letter
Number line 14 and nonmetal ultrasonic detector transmitting radial transducer 2 and nonmetallic ultrasound measuring instrument receive radial transducer 3 and connected
Connect, then two transducers are put into two buried sound detecting pipes respectively, and check two transducer heights whether one
Horizontal plane.After ready, with the slow promotion signal line 14 of lifting tackle 13, two transducers are lifted toward the mouth of pipe simultaneously, together
When instrument start recording detection section ultrasonic velocity, sound when, waveform.During lifting, two transducers should rise simultaneously
Drop, difference distance must not exceed 10cm.
Field data amendment.According to it is detected when temperature, moisture content, depth it is different, its ultrasonic velocity is repaiied
Just.
Sound parameter back analysis：Scene is measured and by the ultrasonic velocity of amendment, substitutes into formula Ed=v2ρ, calculate tested
Test block dynamic modulus of elasticity.Using the method for numerical simulation, the test block dynamic modulus of elasticity calculated is substituted into, in back analysis simulating test pieces
Caused ultrasonic velocity, contrasts revised ultrasonic velocity and the ultrasonic velocity of numerical simulation, and checking bubble mixing is light
The accuracy of matter dirt road dike sound parameter measurement result.The air bubble mix light-textured soil ultrasonic velocity v that back analysis simulatessWith scene
The ultrasonic velocity correction value v measured1Between error must not exceed 5%, otherwise should remeasure ultrasonic velocity.
Embankment quality judges.By scene measure and by amendment ultrasonic velocity, and scene measure sound when, wave amplitude
Deng sound parameter, contrast experiment room Plays conserve the similarly hereinafter ultrasonic velocity of intensity test block, sound duration and amplitude curve, judge road
The quality of dike.Air bubble mix light-textured soil embankment Non-Destructive Testing comprehensive value model is divided into four ranks：
Air bubble mix light-textured soil embankment Non-Destructive Testing comprehensive value model
Embodiment two
The light-weight foamed dirt road of certain highway, the quality that it is poured for sampling Detection, test point is set in a ramp exit.
Testing site light soil embankment design thickness 1.75m, 35 ° of same day temperature, moisture content 15%, using the method for the present invention to the road
Section air bubble mix light-textured soil embankment is sampled detection.Air bubble mix light-textured soil embankments construction match ratio to be detected is cement：
Water：Bubble population=350 (g):215(g):672.1(L).Measuring point drills after the completion of paving buries sound detecting pipe, live measuring point
The distance between two sound detecting pipes for 50cm in the range of 1.75m every 10cm depth detections once, it is disconnected to obtain 17 detections altogether
The air bubble mix light-textured soil embankment ultrasonic velocity in face, see the table below.
Air bubble mix light-textured soil embankment ultrasonic velocity measured value
Laboratory prepares 10cm × 10cm × 50cm 10 pieces of match ratio test blocks of the same race, measures its stable ultrasonic velocity and puts down
Average is 1.06km/s, standard deviation 0.069.After Laboratory Calibration, a is obtained1a2a3b1b2b3c2c3Etc. the numerical value of parameter,
The embankment test point ultrasonic velocity correction value being corrected see the table below, and embankment ultrasonic velocity average value is 1.117km/ after amendment
S, utilize formula Ed=v2ρ, it is about 740MPa to try to achieve the embankment dynamic modulus of elasticity, is simulated using finite element software ABAQUS,
It is 1.110km/s to obtain analog ultrasonic wave velocity of wave, and measured value and laboratory measure numerical value difference 0.62% and be less than 5%, the embankment
Ultrasound examination value is rational.Again by all correction values of the measuring point and air bubble mix light-textured soil embankment Non-Destructive Testing overall merit
Standard is compared, it is found that the ultrasonic velocity of measuring point overwhelming majority detection section is all higher than 1.06km/s, 29% detection is disconnected
The ultrasonic velocity in face is less than laboratory ultrasonic velocity, and within the scope of 2 times of standard deviations of Laboratory Calibration velocity of wave, together
When, by observing its ultrasonic wave wave amplitude, waveform it can also be seen that the ultrasonic wave wave amplitude of each section of the measuring point is all higher than laboratory system
The ultrasonic wave wave amplitude of standby test block, waveform also no significant defect form, therefore may determine that the air bubble mix light-textured soil road of the measuring point
Dike is good.
Example air bubble mix light-textured soil embankment ultrasonic velocity correction value
Claims (11)
1. a kind of air bubble mix light-textured soil embankment lossless detection method, it is characterised in that comprise the following steps：
1) measuring points placement：Before air bubble mix light-textured soil embankment pours, sound detecting pipe is laid in advance in section to be measured；Or on road surface
Drill embedded sound detecting pipe after the completion of paving；
2) ultrasonic signal gathers：After embankment road surface pours completion, gas between sound wave transmission method every group of sound detecting pipe of collection is utilized
Steep mix light-textured soil sound parameter, including when ultrasonic velocity, sound, wave amplitude；
3) field data amendment：According to it is detected when temperature, moisture content, depth it is different, its ultrasonic velocity is modified；
4) sound parameter back analysis：Scene is measured and by the ultrasonic velocity of amendment, substitutes into formula Ed=v2ρ；Calculate tested gas
The dynamic modulus of elasticity of light soil is steeped, using the dynamic modulus of elasticity calculated, caused ultrasonic velocity, right in numerical simulation embankment
Than testing result and numerical simulation result, the accuracy of checking bubble lightweight soil sound parameter measurement result；E in formuladMixed for bubble
The dynamic modulus of elasticity of light soil is closed, v is the air bubble mix light-textured soil ultrasonic velocity measured, and ρ is air bubble mix light-textured soil density；
5) embankment quality judges：Scene is measured and by the ultrasonic velocity of amendment, and the sound parameter that scene measures, contrast
Laboratory Plays conserve the similarly hereinafter ultrasonic velocity of intensity test block, sound duration and amplitude curve form, judge the quality of embankment.
A kind of 2. air bubble mix light-textured soil embankment lossless detection method according to claim 1, it is characterised in that measuring point cloth
It is placed in the maximum position of vehicle flowrate.
3. a kind of air bubble mix light-textured soil embankment lossless detection method according to claim 1, it is characterised in that according to road
Dike length is different, and every 50~100m sets one group of measuring point.
A kind of 4. air bubble mix light-textured soil embankment lossless detection method according to claim 1, it is characterised in that every group of survey
The maximum spacing of point must not exceed 50cm.
5. a kind of air bubble mix light-textured soil embankment lossless detection method according to claim 1, it is characterised in that must protect
The perpendicularity for demonstrate,proving two sound detecting pipes is less than 1 ‰, and measures the clear distance between sound detecting pipe section to be measured with steel tape.
A kind of 6. air bubble mix light-textured soil embankment lossless detection method according to claim 1, it is characterised in that sound detecting pipe
Air bubble mix light-textured soil embankment is higher by, and is wrapped up tightly with pea gravel concreten less than the part at the top of asphalt surface course, inserting surface layer,
Capping closing.
A kind of 7. air bubble mix light-textured soil embankment lossless detection method according to claim 1, it is characterised in that
The ultrasonic velocity data measured need the amendment into trip temperature, moisture content, depth, and its relational expression is：
v1=v0+Tv+wv+Hv
TvIt is temperature correction coefficient, expression formula is：
wvIt is moisture content correction factor, expression formula is：
HvIt is adjusting for depth coefficient, expression formula is：
In formula, v1It is revised ultrasonic velocity, v0It is the ultrasonic velocity measured；a1a2a3b1b2b3c2c3It is related amendment system
Several coefficients, it is fitted to obtain by laboratory test, t1For scene temperature, t0For laboratory temperature, w1For live embankment moisture content, w0
For laboratory test block moisture content, σ1The maximum principal stress of section, P are detected for live embankmentaFor atmospheric pressure.
8. a kind of air bubble mix light-textured soil embankment lossless detection method according to claim 1, it is characterised in that calculate dynamic
The influence of Poisson's ratio is not considered when modulus of elasticity, i.e. formula can be reduced to：
Ed=v2ρ；
E in formuladFor the dynamic modulus of elasticity of air bubble mix light-textured soil, v is the air bubble mix light-textured soil ultrasonic velocity measured, and ρ is gas
Steep mix light-textured soil density.
9. a kind of air bubble mix light-textured soil embankment lossless detection method according to claim 1, it is characterised in that for gas
The back analysis of bubble mix light-textured soil is calculated using professional finite element software ABAQUS, ANSYS.
A kind of 10. air bubble mix light-textured soil embankment lossless detection method according to claim 1, it is characterised in that for
The light soil ultrasonic velocity v that the back analysis of light soil simulatessWith ultrasonic velocity correction value v1Between error must not exceed
5%, embankment ultrasonic velocity is otherwise detected again.
A kind of 11. air bubble mix light-textured soil embankment lossless detection method according to claim 1, it is characterised in that bubble
Mix light-textured soil embankment Non-Destructive Testing comprehensive value model is divided into four ranks：
Wherein：Standard deviation is
In formula,It is normal concrete velocity of wave average value, unit km/s；σvIt is normal concrete velocity of wave standard deviation；viIt is i-th
Measuring point value of wave speed, unit km/s；N is measuring point number.
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