CN106872350A - Feed rod Corrosion monitoring analogy method in deep-well type direct current grounding pole concrete structure - Google Patents
Feed rod Corrosion monitoring analogy method in deep-well type direct current grounding pole concrete structure Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 99
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- 239000004568 cement Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 208000016261 weight loss Diseases 0.000 claims description 3
- 230000004580 weight loss Effects 0.000 claims description 3
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- 229910000831 Steel Inorganic materials 0.000 description 5
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
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- 239000002238 carbon nanotube film Substances 0.000 description 2
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- 238000005345 coagulation Methods 0.000 description 2
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- 229910052742 iron Inorganic materials 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
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Abstract
The invention discloses feed rod Corrosion monitoring analogy method in a kind of deep-well type direct current grounding pole concrete structure, including：（1）Structural model is compared in the contracting for building actual concrete structure；（2）The direct current size of feed rod is passed through by control and/or the galvanic time is passed through, makes feed rod that different degrees of corrosion to occur；（3）Electrical impedance imaging is carried out than structural model to the contracting before feed rod corrosion and after corrosion using electric impedance imaging system, the corresponding electrical impedance imaging figure of each extent of corrosion is obtained respectively；（4）Obtain the mapping relations database of feed rod extent of corrosion and electrical impedance imaging figure；（5）According to the distribution of impedance and its shade of actual concrete structure electrical impedance imaging figure, corresponding electrical impedance imaging figure is manually found out from mapping relations database, the corresponding extent of corrosion of electrical impedance imaging figure is the extent of corrosion of feed rod in actual concrete structure.The present invention realizes the detection whenever and wherever possible of concrete structure feed rod extent of corrosion.
Description
Technical field
The invention belongs to DC transmission engineering earthing pole Corrosion monitoring field, more particularly to a kind of deep-well type direct current grounding pole
Feed rod Corrosion monitoring analogy method in concrete structure.
Background technology
Deep-well type direct current grounding pole is buried to be subject to the corrosion of soil and groundwater in underground, to improve earthing pole
Corrosion resistance and compressive property, therefore earthing pole engineering is from coagulation high with compression strength, decay resistance is better than metal
Soil structure is reinforced to earthing pole.But with the growth of active time, feed rod (the signified feedback of the present invention in concrete structure
Torch is Steel material) still can slowly corrode.After feed rod is corroded, the net sectional area of feed rod reduces, and rotten
Material (the predominantly oxide of iron) produced by erosion can cause volumetric expansion, so that the stress of concrete inner structure is significantly
Increase, cause concrete cracking, can cause when serious and come off, direct current grounding pole overflow performance, security and durability will be made
Into threat.In concrete structure, it is difficult to keep and reinforce the structure of feed rod, cost is also costly.Therefore, to coagulation
Soil structure inside feed rod tarnishing processes accomplish timely and effectively to detect, be direct current grounding pole security evaluation important content it
One.
Notification number is the Chinese patent of CN104215569A, it is proposed that a kind of steel rust in concrete is former with stress state
Position monitoring method, in the method, structural initial pre stress is applied in the reinforcing bar thin slice of concrete reinforcing steel phase same material, but in actual feelings
One-to-one stress state is not reached in condition, the regional stress shape after corroding to the reset condition and reinforcing bar of stress state
State detection can also produce larger error, while commenting extent of steel corrosion at different depth in concrete structure and corrosion risk
Estimate precision not high.
Notification number is the Chinese patent of CN101008620, it is proposed that a kind of inspection of corrosion of concrete bar in reinforced concrete
Survey method, belongs to Structural Engineering field.The method is in implementation process is detected, the sensitivity requirement to sensor is higher, while
Migrate over time, the performance of sensor can decline, the monitoring corrosion of steel work to the later stage causes error.
Notification number is the Chinese patent of CN1438478, it is proposed that a kind of detection of corrosion of concrete bar in reinforced concrete
Method, the method is directly measured the carrier (reinforcing bar) that corrosion occurs in real time.Sensor component units are complicated in the method,
Implementation process is more difficult, by sensor Transducers Embedded in Concrete during construction.Because the environment particularity of concrete structure can be to passing
The use of sensor causes certain difficulty, while not also being suitable for the Corrosion monitoring of feed rod in deep-well grounding concrete structure.
Notification number is the Chinese patent of CN103293092A, it is proposed that a kind of carbon of corrosion of concrete bar in reinforced concrete
Nanometer tube detection device, belongs to the durability detection of reinforced concrete structure in Structural Engineering field and assesses.Carbon in the device
Nano-tube film sensitive grid involves great expense, and connecting line is complex, while carbon nano-tube film sensitive grid needs to be fixed on steel
On muscle rod, the detection means of carbon nano-tube film sensitive grid can be interfered when there is electric current to pass through on bar reinforcement, influence is surveyed
Amount accuracy, therefore it is not suitable for being grounded the Corrosion monitoring of feed rod in concrete structure.
In sum, existing various concrete reinforcing steel corrosion detecting methods, it is impossible to while ensureing economic, easy and essence
The requirement of degree.
The content of the invention
For problems of the prior art, the invention provides a kind of simple and easy to do, with low cost and high precision
Feed rod Corrosion monitoring analogy method in deep-well type direct current grounding pole concrete structure.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：
Feed rod Corrosion monitoring analogy method in deep-well type direct current grounding pole concrete structure, including：
(1) using water, cement, sand and feed rod, actual concrete structure is carried out than ratio in default contracting equivalent
Contracting ratio, builds contracting and compares structural model；
(2) the direct current size of feed rod is passed through by control and/or is passed through the galvanic time, feed rod is occurred not
With the corrosion of degree；Using the weightlessness of feed rod before and after weight-loss method measurement corrosion, the corresponding weightless value of each extent of corrosion is obtained, adopted
With the extent of corrosion of weightless value quantificational expression feed rod；
(3) using electric impedance imaging system to feed rod corrosion before and corrode after contracting than structural model carry out electrical impedance into
Picture, obtains the corresponding electrical impedance imaging figure of each extent of corrosion respectively；Described electric impedance imaging system includes dc source, virtual
Instrument cabinet, virtual instrument controller, data/address bus, voltage acquisition module and matrix switch, dc source and voltage acquisition mould
Block is all connected with matrix switch, and voltage acquisition module and matrix switch connect virtual instrument controller, Virtual instrument by data/address bus
Device controller connects virtual instrument cabinet；
This step is further included：
3.1 contracting P electrode of laying more uniform than structural model outer wall, P is 23~25In the range of value, all electrodes pass through
Wire connection matrix switch, all electrodes be sequentially designated as electrode 1, electrode 2, electrode 3 ... electrode P；
3.2 build P electrode system, and electrode system includes：
1. using electrode 1 and electrode 2 as exciting electrode, sequentially with electrode 3 and electrode 4, electrode 4 and electrode 5 ... electrode
And electrode (P-1), electrode (P-1) and electrode P are used as boundary voltage acquisition electrode pair (P-2)；
2. using electrode 2 and electrode 3 as exciting electrode, sequentially with electrode (p+2) and electrode (p+3), electrode (p+3) and electricity
Pole (p+4) ... electrode (P-1) and electrode P, electrode P and electrode 1 are used as boundary voltage acquisition electrode pair；
3. using electrode p and electrode (p+1) as exciting electrode, sequentially with electrode (p+2) and electrode (p+3), electrode (p+3)
With electrode (p+4) ... electrode (P-1) and electrode P, electrode P and electrode 1, electrode 1 and electrode 2 ... electrode (p-2) and electricity
Pole (p-1) as boundary voltage acquisition electrode pair, p is 3,4 ... (P-1)；
4. using electrode P and electrode 1 as exciting electrode, successively with electrode 2 and electrode 3, electrode 3 and electrode 4 ... electrode
And electrode (P-2), electrode (P-2) and electrode (P-1) are used as boundary voltage acquisition electrode pair (P-3)；
Boundary voltage data are gathered respectively under 3.3 each electrode systems, specially：Dc source is by matrix switch to excitation
Electrode provides exciting current, and voltage acquisition module gathers the boundary voltage number of each boundary voltage acquisition electrode pair by matrix switch
According to；
The boundary voltage data of 3.4 collections are transferred to virtual instrument cabinet, virtual instrument machine by virtual instrument controller
In case electrical impedance imaging is carried out according to boundary voltage data；
(4) feed rod weightless value and electrical impedance imaging figure are set up into mapping relations, obtains feed rod extent of corrosion and resistance
The mapping relations database of anti-image；
(5) change the contracting in sub-step 3.1~3.4 into actual concrete structure than structural model, using sub-step 3.1~
3.4 method carries out electrical impedance imaging to actual concrete structure；According to the impedance of actual concrete structure electrical impedance imaging figure
Distribution and its shade, manually find out corresponding electrical impedance imaging figure, the electrical impedance imaging figure from mapping relations database
Corresponding extent of corrosion is the extent of corrosion of feed rod in actual concrete structure.
Further, virtual instrument cabinet uses the virtual instrument cabinet of PXIe-1062Q models.
Further, virtual instrument controller uses the virtual instrument controller of PXIe-8133 models.
Further, voltage acquisition module uses the voltage acquisition board of PXI6251 models.
Further, matrix switch uses the matrix switch of PXI2532 models.
In sub-step 3.4, electrical impedance imaging is specially：
Boundary voltage data according to being gathered before feed rod corrosion build the boundary voltage distribution matrix under each electrode system,
According to boundary voltage distribution matrix and corresponding exciting electrode, exciting current value, impedance point of the contracting than structural model is calculated
Cloth matrix σ, so as to obtain the nonlinear function v=F (σ) of σ and ν；
Subdivision is carried out to field domain, m finite elements are obtained, each finite elements are obtained according to nonlinear function v=F (σ)
The changing value Δ v=J Δ σ of boundary voltage distribution matrix, wherein, Δ v=vBefore corrosion-vAfter corrosion, vBefore corrosionHave before representing feed rod corrosion
Limit the boundary voltage distribution matrix of unit, vAfter corrosionThe boundary voltage distribution matrix of finite elements after expression feed rod corrosion；Δ σ=
σBefore corrosion-σAfter corrosion, Δ σ is the changing value of the distribution of impedance matrix of finite elements, σBefore corrosionRepresent the preceding finite elements of feed rod corrosion
Distribution of impedance matrix, vAfter corrosionThe distribution of impedance matrix of finite elements after expression feed rod corrosion；
Δ v=J Δs σ to all finite elements is normalized, and obtains z=Sg, wherein
G represents gray scale value matrix of the contracting than structural model, and exponent number is m × 1, gjIt is j-th element, g in gjRepresent j-th
The gray value of finite elements, 1≤j≤m；
Z represents impedance variations vector matrix of the contracting than structural model, and exponent number is n × 1, ziIt is i-th element, z in ziRepresent
Impedance variations value under i-th electrode system, 1≤i≤n；Z is the Δ v after normalization；
S represents sensitivity coefficient matrix of the contracting than structural model, and exponent number is n × m, SijRepresent jth under i-th electrode system
The sensitivity coefficient of individual finite elements electrical conductivity；S is the J after normalization；
Using equation g=STZ obtains electrical impedance imaging figure.
Beneficial effects of the present invention are：
Because deep-well type earthing pole concrete structure feed rod is embedded in concrete, so being adopted in actually detected system
Collection signal is relatively difficult, it is difficult to accomplish to detect feed rod corrosion condition whenever and wherever possible.The present invention is mixed using electrical impedance imaging detection
The corrosion condition of Xtah Crude Clay structure feed rod, according to the contrast of the electrical impedance imaging figure before and after feed rod corrosion, and different corrosion
The difference of the electrical impedance imaging figure of degree, and then judge feed rod extent of corrosion.Corrode containing feed rod in concrete structure and produce
The different material of the impedances such as thing, under conditions of concrete structure impedance reaches more than 20kHz in Current Voltage, according to water content
Difference, distribution of impedance is that tens to thousands of Ω m, feed rod corrosion product impedance is larger, and feed rod impedance levels off to zero.
Therefore, as long as obtaining concrete structure distribution of impedance, i.e. electrical impedance imaging figure, it is possible to indirect assessment feed rod extent of corrosion.
Brief description of the drawings
Fig. 1 is the contracting of concrete structure than structural model schematic diagram；
Fig. 2 is the structured flowchart of electric impedance imaging system；
Fig. 3 is the particular flow sheet of the inventive method.
In figure, 1- wires, 2- contractings than structural model, 3- feed rods, 4- electrodes, 5- dc sources, 6- virtual instrument cabinets,
7- virtual instrument controllers, 8- data/address bus, 9- voltage acquisition modules, 10- matrix switches,
Specific embodiment
The specific embodiment of the invention is described in more detail below in conjunction with accompanying drawing, but this specific embodiment
It is not intended to limit the invention, it is every to use identical characteristic parameter of the present invention and evaluation method, guarantor of the invention all should be listed in
Shield scope.
(1) electrical impedance imaging
According to the actual size and layout of actual concrete structure, equivalent contracting ratio is carried out to actual concrete structure, utilized
Water, cement, sand and feed rod build the contracting of actual concrete structure than structural model 2, see Fig. 1.In this specific embodiment,
Contracting is set to 10 than ratio.Consider the working environment of the simulation actual military service of deep-well type earthing pole, feed rod 3 is passed through different size of
Electric current, makes contracting that different degrees of electrochemical corrosion occur than feed rod in structural model 3, and feed rod is assessed according to mass loss
Extent of corrosion.Electrical impedance imaging is carried out than structural model to the contracting after corrosion, the electrical impedance imaging figure of different extent of corrosions is obtained.
The structured flowchart of electric impedance imaging system is shown in Fig. 2, including dc source 5, virtual instrument cabinet 6, virtual instrument control
Device processed 7, data/address bus 8, voltage acquisition module 9 and matrix switch 10, dc source 5 and voltage acquisition module 9 are all connected with matrix
Switch 10, voltage acquisition module 9 and matrix switch 10 connect virtual instrument controller 7, virtual instrument control by data/address bus 8
The connection virtual instrument of device 7 cabinet 6.Dc source 5 is used for being passed through DC current to exciting electrode, and voltage acquisition module 9 is used for adopting
Collection boundary voltage data, and the boundary voltage data is activation that will be collected is to virtual instrument controller 7, virtual instrument controller 7
Boundary voltage data are imported into virtual instrument cabinet 6, the application software of the memory storage of virtual instrument cabinet 6 is according to boundary voltage data
Carry out electrical impedance imaging.In the present embodiment, virtual instrument cabinet is the virtual instrument cabinet of PXIe-1062Q models, virtual instrument
Controller is the virtual instrument controller of PXIe-8133 models, and voltage acquisition module is the voltage acquisition plate of PXI6251 models
Card, matrix switch is the matrix switch of PXI2532 models.The size of current of dc source can be adjusted directly, in this concrete mode
It is the DC current of 1A to use amplitude.
Contracting is more uniform than structural model outer wall to lay some electrodes 4, and number of electrodes is 23~25；Optional two adjacent electrodes
Used as exciting electrode, remaining electrode is boundary voltage acquisition electrode, and all electrodes are switched by the connection matrix of wire 1.In square
Continuous current excitation electric current is applied to exciting electrode under the control of battle array switch, meanwhile, under the control of matrix switch, adopted from boundary voltage
Colelctor electrode gathers boundary voltage, obtains boundary voltage distribution matrix of the contracting than structural model.According to the boundary voltage data of collection
Electrical impedance imaging is carried out, electrical impedance imaging figure is obtained.
In this specific embodiment, contract 16 electrodes of laying more uniform than structural model outer wall, is sequentially designated as electrode 1, electrode
2nd, electrode 3 ... electrode 16.First, using electrode 1 and electrode 2 as exciting electrode, successively with electrode 3 and electrode 4, electrode 4 and electricity
Pole 5, electrode 5 and electrode 6 ... electrode 15 and electrode 16 are adopted as boundary voltage acquisition electrode pair, altogether 13 groups of boundary voltages
Colelctor electrode pair, gathers 13 boundary voltage values altogether.Then, sequentially with electrode 2 and electrode 3, electrode 3 and electrode 4, electrode 4 and electricity
Pole 5, electrode 5 and electrode 6 ... electrode 15 and electrode 16, electrode 16 and electrode 1 gather boundary voltage as exciting electrode.This
In specific embodiment, 16 electrode systems are built altogether, 13*16 boundary voltage value can be gathered altogether.
The principle of electrical impedance imaging is as follows：
In electrical impedance imaging, the function of field domain middle impedance distribution matrix σ and boundary voltage distribution matrix ν is tested in non-linear
Relation is as follows：
V=F (σ) (1)
In formula (1), boundary voltage distribution matrix ν is built by the boundary voltage data for gathering.
Function shown in formula (1) is adopted and obtained with the following method：Before feed rod is not corroded, obtain each using electric impedance imaging system
Boundary voltage distribution matrix under electrode system, the exciting current matrix according to boundary voltage distribution matrix and corresponding to it,
Computing impedance distribution matrix σ, so as to obtain formula (1) function.
From perturbation theory, after feed rod is corroded, have：
When the changing value Δ σ of distribution of impedance matrix σ is smaller, 0 ((Δ σ) in formula (2)2) it is the higher-order shear deformation of Δ σ,
Can be ignored, then the changing value Δ v of boundary voltage matrix ν is approximately as described below：
Field domain is initialized subdivision, is divided into a large amount of finite elements, thenRepresented after discretization：
Δ v=J Δs σ (4)
In formula (4), J represents the Jacobian matrix after discretization.
For finite elements, Δ v=F (Δ σ), wherein, Δ v=vBefore corrosion-vAfter corrosion, vBefore corrosionBefore representing feed rod corrosion
Boundary voltage distribution matrix, vAfter corrosionThe boundary voltage distribution matrix after feed rod corrosion is represented, thus, each finite elements can be obtained
Δ v.
Matrix equation is utilized during reconstruction image, is obtained after Δ v=J Δs σ normalization：
Z=Sg (5)
In formula (5)：
Z represents impedance variations vector matrix of the contracting than structural model, and exponent number is n × 1, ziIt is i-th element in z, represents
Impedance variations value before and after feed rod corrosion under i-th electrode system, 1≤i≤n；Z is the Δ v after normalization；
G represents gray scale value matrix of the contracting than structural model, and exponent number is m × 1, gjIt is j-th element in g, representing j-th has
Limit the gray value of unit, 1≤j≤m；
S represents sensitivity coefficient matrix of the contracting than structural model, and equivalent to J in formula (4), exponent number is n × m, and n represents contracting ratio
The electrode system number of structural model, m represents field domain subdivision finite elements number of the contracting than structural model, SijRepresent i-th electrode system
The sensitivity coefficient of the lower j-th finite elements electrical conductivity of system, i.e., j-th current value of finite elements；S is the J after normalization.
According to contracting than structural model boundary voltage data constructed by impedance variations vector matrix z come rebuild contracting than knot
The electrical impedance imaging of structure model just will be inverted to sensitivity coefficient matrix S, it is necessary to solve equation z=Sg.It is false in actual solution
If S is orthogonal matrix, S is usedTTo replace S-1, then equation z=Sg be expressed as g=S-1Z, i.e.,：
G=STz (6)
Using equation g=STZ obtains electrical impedance imaging figure.
(2) the mapping relations database of feed rod extent of corrosion and electrical impedance imaging figure is built.
Using the weightlessness of feed rod before and after weight-loss method measurement corrosion, the corresponding weightless value of each extent of corrosion is obtained, using mistake
The extent of corrosion of weight values quantificational expression feed rod.The electrical impedance imaging figure and feed rod weightless value that contract than structural model are set up and is reflected
Relation is penetrated, so as to obtain the mapping relations database of feed rod extent of corrosion and electrical impedance imaging figure.Table 1 is mapping relations data
Storehouse partial data.
The mapping relations database portion divided data of table 1
| It is passed through feed rod electric current | .. | ||||
| Feed rod is actual weightless | .. | ||||
| Tested gray scale value matrix | .. | ||||
| Correspondence electrical impedance imaging figure | Fig1 | Fig2 | Fig2 | .. | Fign |
(3) actual concrete structure feed rod extent of corrosion detection.
Electrical impedance imaging is carried out to actual concrete structure using electric impedance imaging system, actual concrete structure is obtained
Electrical impedance imaging figure.Electrical impedance imaging figure can reflect the distribution of impedance of concrete structure, the corresponding different impedances of different extent of corrosions
Value, different impedance values correspond to different colours again, and impedance is bigger, and electrical impedance imaging figure color is deeper, conversely, image color is got over
It is shallow.According to the distribution of impedance and its shade of actual concrete structure electrical impedance imaging figure, manually from mapping relations database
In find out corresponding electrical impedance imaging figure, the corresponding extent of corrosion of electrical impedance imaging figure is feed rod in actual concrete structure
Extent of corrosion.
Claims (6)
1. feed rod Corrosion monitoring analogy method in deep-well type direct current grounding pole concrete structure, it is characterized in that, including：
(1) using water, cement, sand and feed rod, equivalent contracting ratio is carried out to actual concrete structure than ratio in default contracting,
Build contracting and compare structural model；
(2) the direct current size of feed rod is passed through by control and/or is passed through the galvanic time, make feed rod that different journeys to occur
The corrosion of degree；Using the weightlessness of feed rod before and after weight-loss method measurement corrosion, the corresponding weightless value of each extent of corrosion is obtained, using mistake
The extent of corrosion of weight values quantificational expression feed rod；
(3) electrical impedance imaging is carried out than structural model to the contracting before feed rod corrosion and after corrosion using electric impedance imaging system,
The corresponding electrical impedance imaging figure of each extent of corrosion is obtained respectively；Described electric impedance imaging system includes dc source, Virtual instrument
Device cabinet, virtual instrument controller, data/address bus, voltage acquisition module and matrix switch, dc source and voltage acquisition module
Matrix switch is all connected with, voltage acquisition module and matrix switch connect virtual instrument controller, virtual instrument by data/address bus
Controller connects virtual instrument cabinet；
This step is further included：
3.1 contracting P electrode of laying more uniform than structural model outer wall, P is 23~25In the range of value, all electrodes pass through wire
Connection matrix switch, all electrodes be sequentially designated as electrode 1, electrode 2, electrode 3 ... electrode P；
3.2 build P electrode system, and electrode system includes：
1. using electrode 1 and electrode 2 as exciting electrode, sequentially with electrode 3 and electrode 4, electrode 4 and electrode 5 ... electrode (P-
2) with electrode (P-1), electrode (P-1) and electrode P as boundary voltage acquisition electrode pair；
2. using electrode 2 and electrode 3 as exciting electrode, sequentially with electrode (p+2) and electrode (p+3), electrode (p+3) and electrode (p
+ 4) ... electrode (P-1) and electrode P, electrode P and electrode 1 are used as boundary voltage acquisition electrode pair；
3. using electrode p and electrode (p+1) as exciting electrode, sequentially with electrode (p+2) and electrode (p+3), electrode (p+3) and electricity
Pole (p+4) ... electrode (P-1) and electrode P, electrode P and electrode 1, electrode 1 and electrode 2 ... electrode (p-2) and electrode (p-
1) as boundary voltage acquisition electrode pair, p be 3,4 ... (P-1)；
4. using electrode P and electrode 1 as exciting electrode, successively with electrode 2 and electrode 3, electrode 3 and electrode 4 ... electrode (P-
3) with electrode (P-2), electrode (P-2) and electrode (P-1) as boundary voltage acquisition electrode pair；
Boundary voltage data are gathered respectively under 3.3 each electrode systems, specially：Dc source is by matrix switch to exciting electrode
Exciting current is provided, voltage acquisition module gathers the boundary voltage data of each boundary voltage acquisition electrode pair by matrix switch；
The boundary voltage data of 3.4 collections are transferred to virtual instrument cabinet by virtual instrument controller, in virtual instrument cabinet
Electrical impedance imaging is carried out according to boundary voltage data；
(4) feed rod weightless value and electrical impedance imaging figure are set up into mapping relations, obtain feed rod extent of corrosion and electrical impedance into
As the mapping relations database of figure；
(5) contracting in sub-step 3.1~3.4 is changed into actual concrete structure than structural model, using sub-step 3.1~3.4
Method electrical impedance imaging is carried out to actual concrete structure；According to the distribution of impedance of actual concrete structure electrical impedance imaging figure
And its shade, corresponding electrical impedance imaging figure is manually found out from mapping relations database, electrical impedance imaging figure correspondence
Extent of corrosion be feed rod in actual concrete structure extent of corrosion.
2. feed rod Corrosion monitoring analogy method in deep-well type direct current grounding pole concrete structure as claimed in claim 1, its
It is characterized in：
Described virtual instrument cabinet uses the virtual instrument cabinet of PXIe-1062Q models.
3. feed rod Corrosion monitoring analogy method in deep-well type direct current grounding pole concrete structure as claimed in claim 1, its
It is characterized in：
Described virtual instrument controller uses the virtual instrument controller of PXIe-8133 models.
4. feed rod Corrosion monitoring analogy method in deep-well type direct current grounding pole concrete structure as claimed in claim 1, its
It is characterized in：
Described voltage acquisition module uses the voltage acquisition board of PXI6251 models.
5. feed rod Corrosion monitoring analogy method in deep-well type direct current grounding pole concrete structure as claimed in claim 1, its
It is characterized in：
Described matrix switch uses the matrix switch of PXI2532 models.
6. feed rod Corrosion monitoring analogy method in deep-well type direct current grounding pole concrete structure as claimed in claim 1, its
It is characterized in：
In sub-step 3.4, electrical impedance imaging is specially：
Boundary voltage data according to being gathered before feed rod corrosion build the boundary voltage distribution matrix under each electrode system, according to
Boundary voltage distribution matrix and corresponding exciting electrode, exciting current value, calculate distribution of impedance square of the contracting than structural model
Battle array σ, so as to obtain the nonlinear function v=F (σ) of σ and ν；
Subdivision is carried out to field domain, m finite elements are obtained, the border of each finite elements is obtained according to nonlinear function v=F (σ)
The changing value Δ v=J Δ σ of voltage's distribiuting matrix, wherein, Δ v=vBefore corrosion-vAfter corrosion, vBefore corrosionRepresent limited list before feed rod corrosion
The boundary voltage distribution matrix of unit, vAfter corrosionThe boundary voltage distribution matrix of finite elements after expression feed rod corrosion；Δ σ=
σBefore corrosion-σAfter corrosion, Δ σ is the changing value of the distribution of impedance matrix of finite elements, σBefore corrosionRepresent the preceding finite elements of feed rod corrosion
Distribution of impedance matrix, vAfter corrosionThe distribution of impedance matrix of finite elements after expression feed rod corrosion；
Δ v=J Δs σ to all finite elements is normalized, and obtains z=Sg, wherein
G represents gray scale value matrix of the contracting than structural model, and exponent number is m × 1, gjIt is j-th element, g in gjRepresent j-th it is limited
The gray value of unit, 1≤j≤m；
Z represents impedance variations vector matrix of the contracting than structural model, and exponent number is n × 1, ziIt is i-th element, z in ziRepresent i-th
Impedance variations value under individual electrode system, 1≤i≤n；Z is the Δ v after normalization；
S represents sensitivity coefficient matrix of the contracting than structural model, and exponent number is n × m, SijRepresenting under i-th electrode system j-th has
Limit the sensitivity coefficient of unit electrical conductivity；S is the J after normalization；
Using equation g=STZ obtains electrical impedance imaging figure.
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