CN106066350A - Soil body quality moisture content correction method of testing based on bushing type probe TDR method - Google Patents
Soil body quality moisture content correction method of testing based on bushing type probe TDR method Download PDFInfo
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- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
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- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
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Abstract
A kind of soil body quality moisture content correction method of testing based on bushing type probe TDR method, comprises the following steps: A, demarcation: by the rating test of four various soil mass samples of early stage, it is thus achieved that each soil body sample volumetric water content θ that TDR moisture transducer is measuredi, the real quality moisture content w of each soil body sample that measures of oven drying methodi, and then pass through functionMatching to above-mentioned test value, draws the value of unknown parameter a, thus specify that this functional relation.B, test: the dry density testing out the soil body to be measured is ρdWith TDR moisture transducer to soil boundary minimum range L/2 to be measured；Utilize bushing type probe TDR moisture transducer to measure soil body volumetric water content test value θ to be measured, obtain soil body quality moisture content w to be measured,This method eliminates other media impact on soil body dielectric property to be measured in the range of sensor Validity Test in bushing type probe TDR method, improve the accuracy of test soil moisture content, thus the design and construction for Geotechnical Engineering provides relatively reliable, test data accurately.
Description
Technical field
The method that the present invention relates to a kind of bushing type probe TDR method test soil moisture content.
Background technology
Accurately test properties evaluations, stability analysis and the compaction quality to engineering of soil moisture content in Geotechnical Engineering
Control that there is important function.Oven drying method is as the standard method of mensuration soil body quality moisture content, its test result in current specification
Accurately, but there is sampling difficulty during on-the-spot application, structure is had damage and cannot the problem such as monitoring the most automatically.
Owing to soil body apparent dielectric constant is soil water (dielectric constant Kwater=81), air (Kair=1) and soil particle
(Ksoil=3～5) dielectric constant integrated value, dielectric constant of soil body is mainly determined by soil body volumetric water content.Inserted by test
Enter the spread speed of the upper electromagnetic wave of the probe in the soil body, the apparent dielectric constant of the soil body to be measured can be measured, then utilize foundation
Soil body apparent dielectric constant KaAnd the relational model (K between soil body volumetric water content θaθ equation) determine soil body volume of aqueous
Rate, and can convert and obtain soil body weight moisture content, this method is referred to as electromagnetic wave time domain reflectometry (Time Domain
Reflectometry, TDR).Compared with oven drying method, owing to need not sampling, to soil structures not damaged, therefore TDR method is notable
Improve soil moisture content testing efficiency, and the long-term automatization dynamic monitoring of soil moisture content can be realized.
The moisture transducer that TDR method uses typically uses pin probes, when testing soil moisture content, still for some survey side
Formula, need to bury sensor underground at diverse location soil layer when carrying out soil body space porous media and measuring, and causes sensor to utilize effect
Rate is low, workload is relatively big and measurement of water-content coefficient result is produced impact.The method improved is bushing type probe TDR method, the most logical
Crossing pre-plugged or squeeze into the specialized barrel of the soil body, probe is inserted in sleeve pipe, and during test, probe can move up and down in sleeve pipe,
Thus realize the probe follow-on test at different spatial soil moisture content；The introducing of sleeve pipe simultaneously can avoid probe
Directly contacting with the soil body, protection probe is without damage, can realize reusing for a long time of TDR moisture transducer.But, due to set
The volumetric water content test result of tubular type probe TDR method is that around sensor, in effective range, the comprehensive dielectric of testing medium is special
Property reflection, actually used bushing type probe TDR moisture transducer time, if having except Jie to be measured in sensor effective range
Other media beyond matter disturb, namely the border change of the soil body to be measured can cause sensor surrounding medium dielectric property to produce change
Change, and then the TDR water cut test result of the soil body to be measured can be made a significant impact, reduce test result accuracy with reliable
Property.
Summary of the invention
It is an object of the present invention to provide a kind of soil body quality moisture content correction test side based on bushing type probe TDR method
Method, in the range of this method eliminateing bushing type probe TDR moisture transducer Validity Test, other media are special to soil body dielectric to be measured
Property the impact that produces, can improve the accuracy of TDR Test soil moisture content, thus the design and construction for Geotechnical Engineering provides more
Add reliably, test data accurately.
The present invention realizes its goal of the invention and be the technical scheme is that a kind of soil body based on bushing type probe TDR method
Quality moisture content correction method of testing, comprises the following steps:
A kind of soil body quality moisture content correction method of testing based on bushing type probe TDR method, comprises the following steps:
A, demarcation
A1, prepare the cuboid proof boxs identical with TDR moisture transducer probe measurement segment length of four height or cylinder
Proof box, wherein, the bottom surface of cuboid proof box is square；The length of side of four proof boxs or diameter are different, wherein i-th examination
The length of side of tryoff or a diameter of Li, i is the sequence number of proof box, i=1,2,3,4；
A2, proof box planar central vertically place for TDR moisture transducer probe test specialized barrel, at the bottom of sleeve pipe
End seal is closed, top end opening, and sleeve pipe height is higher than proof box height 50mm；
A3, in each proof box prepare dry density be ρd0Soil body sample, then by TDR moisture transducer probe be placed in
In sleeve pipe, and make the probe height half equal to proof box height；Open TDR moisture transducer, test out each proof box soil
Volumetric water content θ at body sample middle sectioni；
A4, at probe positions, take the 50g soil body in each proof box, obtain this sampling soil body according to oven drying method test
Real quality moisture content wi；Obtain the proportionality coefficient k of each proof box soil body samplei,Wherein, ρwFor water
Density；
A5, with the 2 of the proof box length of side or diameter namely bushing type TDR moisture transducer to soil boundary minimum range to be measured
It is abscissa L again, with the proportionality coefficient of the soil body to be measuredFor vertical coordinate, form right angle coordinate system；In this coordinate system
By four proof box length of sides or diameter LiAnd the proportionality coefficient of correspondenceFour points draw, then use functionFour points in coordinate system are fitted, draw the value of parameter a；
B, test
The dry density first testing out the soil body to be measured is ρd, measure TDR moisture transducer to soil boundary minimum range to be measured
L/2；Utilize bushing type probe TDR moisture transducer to measure soil body volumetric water content θ to be measured, substitute into functionI.e. can get soil body quality moisture content w to be measured,
Compared with prior art, the invention has the beneficial effects as follows:
Applicant studies discovery, soil boundary L/2 and soil body quality moisture content w, soil body dry density ρdPop one's head in bushing type
The soil body sample volumetric water content θ that TDR moisture transducer is measured, existence function relation:The present invention and then logical
Cross the rating test of early stage various soil mass sample, it is thus achieved that the unknown parameter a in above-mentioned functional relationship, draw the quality of the soil body to be measured
Moisture content w and bushing type probe TDR method measure soil body volumetric water content test value θ, the definite relation of soil body sample border L/2
Formula, i.e.
Therefore, after the present invention is by measuring the border of the soil body to be measured, recycle above-mentioned relation formula, bushing type can be eliminated and visit
The impact that in head TDR method, in the range of moisture transducer Validity Test, soil body dielectric property to be measured is produced by other media, improves
The accuracy of soil moisture content test, thus the design and construction for Geotechnical Engineering provides relatively reliable, test data accurately.
Result of the test shows, the quality moisture content that the quality moisture content that the test soil body is measured by the present invention obtains with oven drying method
Absolute error be 0.07%, and the existing bushing type probe TDR moisture transducer reduced mass moisture content that obtains of test with
The quality moisture content absolute error that oven drying method obtains is 0.81%.Compared with bushing type probe TDR moisture transducer test, this
Bright test absolute error is less than the 1/10 of its test absolute error.
The present invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 proof box length of side or diameter LiWith proportionality coefficient kiRelation curve.
Detailed description of the invention
Embodiment
A kind of detailed description of the invention of the present invention is: a kind of soil body quality moisture content based on bushing type probe TDR method is repaiied
Positive method of testing, comprises the following steps:
A kind of soil body quality moisture content correction method of testing based on bushing type probe TDR method, comprises the following steps:
A, demarcation
A1, prepare the cuboid proof boxs identical with TDR moisture transducer probe measurement segment length of four height or cylinder
Proof box, wherein, the bottom surface of cuboid proof box is square；The length of side of four proof boxs or diameter are different, wherein i-th examination
The length of side of tryoff or a diameter of Li, i is the sequence number of proof box, i=1,2,3,4；
A2, proof box planar central vertically place for TDR moisture transducer probe test specialized barrel, at the bottom of sleeve pipe
End seal is closed, top end opening, and sleeve pipe height is higher than proof box height 50mm；
A3, in each proof box prepare dry density be ρd0Soil body sample, then by TDR moisture transducer probe be placed in
In sleeve pipe, and make the probe height half equal to proof box height；Open TDR moisture transducer, test out each proof box soil
Volumetric water content θ at body sample middle sectioni；
A4, at probe positions, take the 50g soil body in each proof box, obtain this sampling soil body according to oven drying method test
Real quality moisture content wi；Obtain the proportionality coefficient k of each proof box soil body samplei,Wherein, ρwFor water
Density；
A5, with the 2 of the proof box length of side or diameter namely bushing type TDR moisture transducer to soil boundary minimum range to be measured
It is abscissa L again, with the proportionality coefficient of the soil body to be measuredFor vertical coordinate, form right angle coordinate system；In this coordinate system
Middle by four proof box length of sides or diameter LiAnd the proportionality coefficient of correspondenceFour points draw, then use functionFour points in coordinate system are fitted, draw the value of parameter a；
B, test
The dry density first testing out the soil body to be measured is ρd, measure TDR moisture transducer to soil boundary minimum range to be measured
L/2；Utilize bushing type probe TDR moisture transducer to measure soil body volumetric water content θ to be measured, substitute into functionI.e. can get soil body quality moisture content w to be measured,
Verification experimental verification
Using TRIME-PICO-IPH series TDR intelligent water sub sensor to carry out rating test, sensor is by TRIME-HD
Hand-held reading table, TRIME-T3 cylindrical sleeves formula probe and high frequency cable transmission line composition, wherein TRIME-HD is hand-held
Formula reading table can directly display soil body volumetric water content test value, TRIME-T3 cylindrical sleeves formula probe diameter 37mm, visits
Head measuring section length 220mm, probe test sleeve pipe be made up of special TECANAT (Merlon) material, external diameter 44mm, internal diameter
42mm, length 270mm.Normal sand is obtained according to " railway engineering earthwork test rule " (TB10102-2010) sieve test
Big particle diameter is not less than 1.0mm, and the granule content less than 0.5mm is 99.94%, and the granule content less than 0.25mm is 99.82%,
Granule content less than 0.075mm is 0.80%, and nonuniformity coefficient is 2.00, and coefficient of curvature is 1.04；By relative density test
Record normal sand maximum dry density ρdmax=1.663g/cm3, experimental relationship ρdmin=1.337g/cm3。
By above example method, selecting bottom surface is foursquare cuboid proof box, numbered 1,2,3, No. 4, and it is put down
Face length of side Li(i=1,2,3,4) are followed successively by 200mm, 300mm, 400mm, 500mm, are highly 220mm, in proof box plane
The specialized barrel for the probe test of TDR moisture transducer is vertically placed in center, and preparation dry density is ρd0=1.45g/cm3Mark
Quasi-sand sample also carries out placement in layers.After having filled, TDR moisture transducer probe is stretched into sleeve pipe, soil in the middle part of testing experiment case
Volumetric water content θi；After TDR measurement terminates, fetch earth in the middle part of each proof box respectively, obtain true by oven drying method test
Quality moisture content wi.After measurement terminates, with L as abscissa,For vertical coordinate, use functionTo Li
With kiIn a coordinate system four point curves carry out curve fitting, as shown in Figure 1, it can be deduced that parameter a=26.
The dry density testing the soil body to be measured is ρd=1.51g/cm3, measure bushing type probe TDR moisture transducer to be measured
Soil boundary minimum range is L/2=50mm, utilizes bushing type probe TDR moisture transducer to measure soil body volumetric water content to be measured
Test value θ=5.56%, substitutes into functionI.e. can get soil body quality moisture content w=4.42% to be measured.For
The accuracy of checking function, samples at proof box middle section, is obtained the real quality of soil body sample by oven drying method test
Moisture content is w0=4.49%, owing to the volumetric water content of TDR Test is scaled quality moisture content be
Result, it is believed that when bushing type probe TDR moisture transducer extremely soil boundary minimum range to be measured is L/2=50mm, i.e. L=
During 100mm, TDR Test result is significantly affected, TDR reduced mass moisture content w0' the real quality that obtains with oven drying method contains
Water rate w0The absolute value of absolute error is | w0′-w0|=0.81%, and the present invention passes through functionDraw treats
Surveying soil body quality moisture content is w=4.42%, is only with the absolute value of oven drying method quality moisture content absolute error | w-w0|=
0.07%.
As can be seen here, the function of the present invention is usedConsider bushing type probe TDR moisture transducer to have
The problem that in the range of effect test, the test result error that caused by other medium influences of the soil body to be measured is bigger, improves the soil body
The accuracy of water cut test result.
Claims (1)
1. a soil body quality moisture content correction method of testing based on bushing type probe TDR method, comprises the following steps:
A, demarcation
A1, prepare the cuboid proof boxs identical with TDR moisture transducer probe measurement segment length of four height or cylinder test
Case, wherein, the bottom surface of cuboid proof box is square；The length of side of four proof boxs or diameter are different, wherein i-th proof box
The length of side or a diameter of Li, i is the sequence number of proof box, i=1,2,3,4；
A2, proof box planar central vertically place for TDR moisture transducer probe test specialized barrel, casing shoe seal
Close, top end opening, sleeve pipe height higher than proof box height 50mm；
A3, in each proof box prepare dry density be ρd0Soil body sample, then by TDR moisture transducer probe be placed in sleeve pipe
In, and make the probe height half equal to proof box height；Open TDR moisture transducer, test out the examination of each proof box soil body
Volumetric water content θ at sample middle sectioni；
A4, at probe positions, take the 50g soil body in each proof box, obtain the true of this sampling soil body according to oven drying method test
Quality moisture content wi；Obtain the proportionality coefficient k of each proof box soil body samplei,Wherein, ρwDensity for water；
A5, with 2 times of the proof box length of side or diameter namely bushing type TDR moisture transducer to soil boundary minimum range to be measured it is
Abscissa L, with the proportionality coefficient of the soil body to be measuredFor vertical coordinate, form right angle coordinate system；Will in this coordinate system
Four proof box length of sides or diameter LiAnd the proportionality coefficient of correspondenceFour points draw, then use functionFour points in coordinate system are fitted, draw the value of parameter a；
B, test
The dry density first testing out the soil body to be measured is ρd, measure TDR moisture transducer to soil boundary minimum range L/2 to be measured；Profit
Measure soil body volumetric water content θ to be measured with bushing type probe TDR moisture transducer, substitute into function?
Obtain soil body quality moisture content w to be measured,
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Cited By (5)
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| CN108490150A (en) * | 2018-02-10 | 2018-09-04 | 中国科学院东北地理与农业生态研究所 | The indoor high-precision absolute calibration method of soil moisture sensor |
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| CN108918606A (en) * | 2018-07-26 | 2018-11-30 | 王亮亮 | Dielectric method measures the acquisition methods of the soil in-situ rating curve of soil moisture content |
| CN111337542A (en) * | 2020-04-10 | 2020-06-26 | 中南大学 | Method and device for monitoring osmotic absorption force in heavy metal polluted site by time domain reflection method |
| CN115453437A (en) * | 2022-09-19 | 2022-12-09 | 西安交通大学 | Non-invasive time domain reflection probe calibration method and system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490150A (en) * | 2018-02-10 | 2018-09-04 | 中国科学院东北地理与农业生态研究所 | The indoor high-precision absolute calibration method of soil moisture sensor |
| CN108918606A (en) * | 2018-07-26 | 2018-11-30 | 王亮亮 | Dielectric method measures the acquisition methods of the soil in-situ rating curve of soil moisture content |
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| CN111337542A (en) * | 2020-04-10 | 2020-06-26 | 中南大学 | Method and device for monitoring osmotic absorption force in heavy metal polluted site by time domain reflection method |
| CN111337542B (en) * | 2020-04-10 | 2021-05-14 | 中南大学 | Method and device for monitoring osmotic absorption force in heavy metal polluted site by time domain reflection method |
| CN115453437A (en) * | 2022-09-19 | 2022-12-09 | 西安交通大学 | Non-invasive time domain reflection probe calibration method and system |
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