CN107870201B - 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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- 239000002689 soil Substances 0.000 title claims abstract description 77
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- 229910000831 Steel Inorganic materials 0.000 claims description 5
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- 238000009659 non-destructive testing Methods 0.000 claims description 5
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- 239000004567 concrete Substances 0.000 claims description 4
- 238000009533 lab test Methods 0.000 claims description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000010426 asphalt Substances 0.000 claims description 2
- 239000002344 surface layer Substances 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims 1
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Abstract
The present invention relates to a kind of air bubble mix light-textured soil embankment lossless detection methods, are embankment detection field.Including the following steps: (1) measuring points placement；(2) ultrasonic signal acquires；(3) field data is corrected；(4) sound parameter back analysis；(5) embankment quality determines.The present invention provides a kind of simple and practical method for the detection of air bubble mix light-textured soil embankment quality, equally has very strong reference function to the quality testing of other type embankment engineerings.
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 comprehensive judgement method based on sound wave transmission method.
Background technique
As the air bubble mix light-textured soil of novel rock-soil material, end of the bridge transition section has been widely used in it, containing structure
The special Soft Roadbed such as object 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 that very more, and has been proven in practice.However, from native different, the bubble of traditional embankment fill material
The passage of mix light-textured soil engineering property at any time gradually decays, this is because cement products is over time, 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, the former is progressive destruction, and the latter is sudden avalanche.Therefore, such as
What can carry out permanently effective detection to air bubble mix light-textured soil embankment, be under 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.
Summary of the invention
To solve the above problems, the present invention proposes to detect air bubble mix light-textured soil embankment engineering property using sound wave transmission method
Method.This method is easy 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 is mended, the quality testing for air bubble mix light-textured soil embankment and earthfill road embankment has good
Directive significance.
In order to achieve the goal above, the present invention adopts the following technical scheme:
A kind of air bubble mix light-textured soil embankment lossless detection method, comprising the following steps:
1 measuring points placement of STEP: 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 drills after the completion of paving.
The acquisition of 2 ultrasonic signal of STEP: after pouring completion to embankment road surface, every group of sound is acquired 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..
3 field data of STEP amendment: according to it is detect when temperature, moisture content, depth difference, to its ultrasonic velocity
It is modified.
Scene: being measured and is passed through modified ultrasonic velocity by 4 sound parameter back analysis of STEP, substitutes into formula Ed=v2ρ (formula
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 is mixed for bubble
Close light soil density), calculate the dynamic modulus of elasticity of tested air bubble mix light-textured soil embankment.Using the dynamic modulus of elasticity calculated,
The ultrasonic velocity generated in simulated bubble mix light-textured soil, contrasting detection result and numerical simulation result, verifying test block sound ginseng
The accuracy of measurements.
5 embankment quality of STEP determines: scene is measured to and passed through modified ultrasonic velocity, and the sound that scene measures
When, the sound parameter such as wave amplitude, with the ultrasonic velocity of intensity test block, sound duration and amplitude curve under the maintenance of comparative experiments room Plays
Form determines the quality of embankment.
Preferably, point layout is in the maximum position of vehicle flowrate.
Preferably, different according to embankment length, one group of measuring point is arranged in every 50~100m.
Preferably, the maximum spacing of every group of measuring point must not exceed 50cm.
Preferably, it is necessary to assure the verticality of two sound detecting pipes measures sound detecting pipe section to be measured less than 1 ‰, and with steel tape
Between clear distance.
Preferably, sound detecting pipe should be higher by air bubble mix light-textured soil embankment, and lower than at the top of asphalt surface course, be inserted into the portion of surface layer
Divide and wraps up tight, capping closing with pea gravel concreten.
Preferably, the ultrasonic velocity data measured need to carry out the amendment of temperature, moisture content, depth, relational expression are as follows:
v1=v0+Tv+wv+Hv；
TvIt is temperature correction coefficient, expression formula are as follows:
wvIt is moisture content correction factor, expression formula are as follows:
HvIt is adjusting for depth coefficient, expression formula are as follows:
In formula, v1It is revised ultrasonic velocity, v0It is the ultrasonic velocity measured；a1a2a3b1b2b3c2c3It is related
The coefficient of correction factor is fitted to obtain, t by laboratory test1For 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 simplify are as follows:
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
It calculates.
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.
Compared with the existing technology, the application achieve it is following the utility model has the advantages that
Currently, more advanced embankment lossless detection method has: Ground Penetrating Radar 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, is widely used in embankment detection.However air bubble mix light-textured soil is placement in layers, every
When layer fills, it has all been laid with steel mesh between layers.The electromagnetic wave that steel mesh emits Ground Penetrating Radar has shielding action, so
Ground Penetrating Radar is not appropriate for the detection of bubble lightweight dirt road dike；And spectrum analysis technique is since operation needs to arrange along the line every time for it
Very long survey line, while it reflects the distribution situation of embankment inner cavity, cavity mainly with waveform, for embankment engineering
The detection of energy parameter such as density, elasticity modulus, Strength Changes, and be not suitable for.High Density Resistivity can be completed more in field
The observation of kind electrode assembly, therefore can adapt to various geological prospecting tasks.High-density electric is also to utilize such as more 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, complicated for operation, ambient temperature on its testing result influence compared with
Greatly, therefore, it is also not suitable for the quality testing of Expressway Embankment.
Operation of the present invention is easy, detection rapidly, explicit physical meaning, not by external environment variation or other constraint conditions
It influences, can go deep into inside embankment in the case where not damaging embankment, the accurate ultrasonic acoustic parameter for obtaining light soil embankment is
Unit in charge of construction accurately holds its construction quality and provides guarantee；After road operation, inbuilt measuring point still is able to normally mention in construction
For sound wave transmission method detection data, intensity, the rigidity, life requirement of embankment entirety are held for dynamic, improve 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 substantially saved.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention；
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 instruments emit radial transducer；3-is nonmetallic
Ultrasound measuring instrument receives radial transducer；4-sound detecting pipes；5-sounding pipe holders；6-air bubble mix light-textured soil embankments；7-roads
Dike bottom solum；8-cement mortar；9-road decks；10-pea gravel concretens；11-sound detecting pipe lids；12-tripods；
13-lifting tackles；14-signal wires.
Specific embodiment
Embodiment one
A kind of air bubble mix light-textured soil embankment scene lossless detection method of the invention, it the following steps are included:
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, should run the maximum vertical section of road traffic along future, and every 50~100m installs one group.Every group
Measuring point includes two sound detecting pipes 4, and the maximum distance of sound detecting pipe must not exceed 50cm.Sound detecting pipe should be inserted into embankment bottom solum 7
Light soil embankment basal surface position is filled up to more than 20cm, and with cement mortar 8.Upwards when installation sound detecting pipe 4, in every sound detecting pipe
3 metal sound detecting pipe brackets 5 are installed outside 4, to keep its verticality and stability, in order to avoid because of construction in light soil casting process
Reason is bent sound detecting pipe, influences testing result.After being installed, should check the verticality of every sound detecting pipe whether less than 1 ‰,
If the verticality of sound detecting pipe is greater than 1 ‰ less than 5 ‰, the clear distance between section to be measured is measured with steel ring ruler, if sound detecting pipe
Verticality is greater than 5 ‰, then should extract and reinstall.Sound detecting pipe should be higher by embankment, pour completion to air bubble mix light-textured soil embankment,
When road deck 9 is mated formation be inserted into road deck in, oral area pea gravel concreten 10 wraps up tightly, and plus sound detecting pipe lid 11 to
With.
Ultrasonic signal acquisition.After pouring completion to embankment road surface, into scene, tripod 12 is installed, prepares detection.
Check whether nonmetallic ultrasound measuring instrument 1 is normal before detection, then open sound detecting pipe lid 11, clear water is added in sound detecting pipe.It will letter
Number line 14 and nonmetal ultrasonic detector transmitting radial transducer 2 and nonmetallic ultrasound measuring instrument receive radial transducer 3 and connect
It connects, then two energy converters is put into inbuilt two sound detecting pipes of institute respectively, and check two transducer heights whether one
Horizontal plane.After ready, with the slow promotion signal line 14 of lifting tackle 13, two energy converters are lifted toward nozzle simultaneously, together
When instrument start recording detection section ultrasonic velocity, sound when, waveform.During promotion, two energy converters 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 repaired
Just.
Sound parameter back analysis: scene is measured and passes through modified ultrasonic velocity, substitutes into formula Ed=v2ρ is calculated 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
The ultrasonic velocity of generation, compares the ultrasonic velocity of revised ultrasonic velocity and numerical simulation, and verifying 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 re-measure ultrasonic velocity.
Embankment quality determines.Scene is measured to and is passed through modified ultrasonic velocity, and when the live sound measured, wave amplitude
Equal sound parameter determines road with the ultrasonic velocity of intensity test block, sound duration and amplitude curve under the maintenance of comparative experiments room Plays
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
Test point is arranged in a ramp exit in the light-weight foamed dirt road of certain highway, the quality that it is poured for sampling Detection.
Testing site light soil embankment design thickness 1.75m, 35 ° of same day temperature, moisture content 15%, using method of the 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 are that 50cm is primary every 10cm depth detection within the scope of 1.75m, and 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 10 pieces of match ratio test block of the same race of 10cm × 10cm × 50cm, and it is flat to measure its stable ultrasonic velocity
Mean value is 1.06km/s, standard deviation 0.069.After Laboratory Calibration, a is obtained1a2a3b1b2b3c2c3Etc. parameters numerical value,
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 utilizes formula Ed=v2ρ, acquiring the embankment dynamic modulus of elasticity is about 740MPa, is simulated using finite element software ABAQUS,
Obtaining analog ultrasonic wave velocity of wave is 1.110km/s, and measured value and laboratory measure numerical value difference 0.62% less than 5%, the embankment
Ultrasound examination value is reasonable.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 larger 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 larger 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 (10)
1. a kind of air bubble mix light-textured soil embankment lossless detection method, which comprises 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 acquires: after embankment road surface pours completion, acquiring gas between every group of sound detecting pipe using sound wave transmission method
Steep mix light-textured soil sound parameter, including when ultrasonic velocity, sound, wave amplitude；
3) field data correct: according to it is detect when temperature, moisture content, depth difference, its ultrasonic velocity is modified；
4) sound parameter back analysis: scene is measured and passes through modified ultrasonic velocity, 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, the ultrasonic velocity generated in numerical simulation embankment is right
Than testing result and numerical simulation result, the accuracy of bubble lightweight soil sound parameter measurement result is verified；E in formuladIt is mixed 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 determines: scene is measured to and passed through modified ultrasonic velocity, and the sound parameter that scene measures, comparison
With the ultrasonic velocity of intensity test block, sound duration and amplitude curve form under the maintenance of laboratory Plays, the quality of embankment is determined；
The ultrasonic velocity data measured need to carry out the amendment of temperature, moisture content, depth, relational expression are as follows:
v1=v0+Tv+wv+Hv
TvIt is temperature correction coefficient, expression formula are as follows:
wvIt is moisture content correction factor, expression formula are as follows:
HvIt is adjusting for depth coefficient, expression formula are as follows:
In formula, v1It is revised ultrasonic velocity, v0It is the ultrasonic velocity measured；a1、a2、a3、b1、b2、b3、c2、c3It is phase
The coefficient for closing correction factor, is fitted to obtain, t by laboratory test1For scene temperature, t0For laboratory temperature, w1Contain for live embankment
Water rate, w0For laboratory test block moisture content, σ1The maximum principal stress of section, P are detected for live embankmentaFor atmospheric pressure.
2. a kind of air bubble mix light-textured soil embankment lossless detection method according to claim 1, which is characterized 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, which is characterized in that according to road
Dike length is different, and one group of measuring point is arranged in every 50~100m.
4. a kind of air bubble mix light-textured soil embankment lossless detection method according to claim 1, which is characterized 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, which is characterized in that must protect
The verticality of two sound detecting pipes is demonstrate,proved less than 1 ‰, and measure the clear distance between sound detecting pipe section to be measured with steel tape.
6. a kind of air bubble mix light-textured soil embankment lossless detection method according to claim 1, which is characterized in that sound detecting pipe
It is higher by air bubble mix light-textured soil embankment, and is wrapped up tightly lower than the part pea gravel concreten at the top of asphalt surface course, being inserted into surface layer,
Cover closing.
7. a kind of air bubble mix light-textured soil embankment lossless detection method according to claim 1, which is characterized in that calculate dynamic
The influence of Poisson's ratio is not considered when elasticity modulus, i.e. formula can simplify are as follows:
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.
8. a kind of air bubble mix light-textured soil embankment lossless detection method according to claim 1, which is characterized in that for gas
The back analysis of bubble mix light-textured soil is calculated using professional finite element software ABAQUS, ANSYS.
9. a kind of air bubble mix light-textured soil embankment lossless detection method according to claim 1, which is characterized in that for light
The light soil ultrasonic velocity v that the back analysis of matter soil simulatessWith ultrasonic velocity correction value v1Between error must not exceed
5%, embankment ultrasonic velocity is otherwise detected again.
10. a kind of air bubble mix light-textured soil embankment lossless detection method according to claim 1, which is characterized 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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