CN106443189A - Method and system for three-dimensional detection on earth electrode field and surrounding soil resistivity - Google Patents
Method and system for three-dimensional detection on earth electrode field and surrounding soil resistivity Download PDFInfo
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- CN106443189A CN106443189A CN201611102074.1A CN201611102074A CN106443189A CN 106443189 A CN106443189 A CN 106443189A CN 201611102074 A CN201611102074 A CN 201611102074A CN 106443189 A CN106443189 A CN 106443189A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/081—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices the magnetic field is produced by the objects or geological structures
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- G—PHYSICS
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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Abstract
The invention relates to a method and a system for three-dimensional detection on an earth electrode field and surrounding soil resistivity. The method comprises the following steps of (1) combining an AMT (audio magnetotelluric) method and an MT (magnetotelluric) method to arrange measuring points in and around the initial range of the earth electrode field; (2) using a high-precision measuring instrument to measure the earth coordinate and elevation of each arranged measuring point, so as to obtain the coordinate data of each measuring point; (3) using an MT instrument system to collect field data of each measuring point according to the requirements of MT and AMT technical specifications, so as to obtain time sequence data of each measuring point; (4) according to the collected coordinate data and time sequence data of each measuring point at field, performing data processing and three-dimensional inversion, so as to obtain the three-dimensional resistivity structure meeting the actual underground geology conditions. The method can be widely applied to the selection of the earth electrode field and the detection of the soil resistivity.
Description
Technical field
The present invention relates to a kind of soil resistivity detection method and system, especially with regard to a kind of complex condition earthing pole
Pole location and its Soil Surrounding resistivity three-dimensional detection method and system.
Background technology
The HVDC transmission system for having put into operation at present, is substantially and adopts two-terminal direct current transmission system, at two ends
In DC transmission system, earthing pole is played clamps down on neutral point potential, circulation out-of-balance current and in polar curve fault or maintenance
When for electric current provide the earth return path effect, be important ingredient in DC transmission system.Wherein, earth electrode field
Selection be one of most important link in whole earthing pole design process.
According to domestic and international project experience, the earth electrode field as HVDC transmission system should be broad and electric conductivity
Good the earth diverging portion, especially near the location of pole, soil resistivity is preferably in below 100 Ω m, and soil will have enough water
Point, and with thermal capacity height, the advantages of conducting electricity very well.The domestic soil resistivity to earthing pole is measured, typically initially with
Winner four-electrode method measurement shallow-layer is the soil resistivity of 0～1000m under the location of pole；Secondly magnetotelluric method (referred to as MT method) is adopted
Measurement deep layer is 1000m soil below resistivity under the location of pole；Then the shallow-layer that obtains and deep soil resistivity are carried out comprehensive
Close layering；It is modified to being layered result finally by beam test, obtains the resistivity Model of final design input.Under
Face is simply introduced to the ultimate principle of several main soil resistivity measuring methods respectively.
1) winner four-electrode method measurement soil resistivity
As shown in figure 1, wherein C1 and C2 are electric current pole, P1 and P2 is voltage pole,For ammeter,For voltmeter, E is
Power supply, the earth apparent resistivity for obtaining is：
In formula：ρsFor the earth apparent resistivity, unit is Ω m；S is pole span, and unit is m；U is the voltage between P1 and P2
Difference, unit is V；I is electric current, and unit is A.
Winner four-electrode method is the main method of domestic measurement ground resistivity at present, but as winner four-electrode method belongs to straight
Leakage resistance rate method, its depth of exploration is determined away from (distance of electric current pole and voltage pole) by receiving and dispatching, and will reach big depth of exploration, is received
Send out away from necessary sufficiently large.1000 meters of depth of exploration is reached, conservative estimation maximum polar distance of supplying power will be more than 4000 meters, so
Big pole span field work high labor intensive, work efficiency extremely low (1-2 depth measurement point can be done for 1 day), limited by the condition of passing through sometimes
System is not necessarily feasible.More important reason, as dc resistivity is easily shielded by low resistivity layer, it is difficult to resistive formation is penetrated, even if
Very big polar distance of supplying power is reached, has also been differed surely and reach expected depth of exploration.Based on many reasons above, thus winner four
Pole method is not effective exploitation method that depth of exploration reaches km.
2) magnetotelluric method measurement soil resistivity
MT method is built upon the electromagnetic exploration method on the basis of electromagnetic induction principle, and field source is natural alternating electromagnetic field.
MT method work when be on a measuring point while and continuously record electric field two orthogonal horizontal components Ex, Ey, and
Three, magnetic field orthogonal components Hx, Hy, Hz, i.e., while record this time dependent time series of five components.Pass through
Time series data is carried out the earth's surface impedance Z that can obtain at the measuring point with cycle T change is processed, can be entered according to earth's surface impedance Z
One step sorts out apparent resistivity ρsWith phase place (the actual phase value for impedance Z) data, apparent resistivity ρsIt is defined as：
ρs=0.2T | Z |2(2)
To apparent resistivity ρsProcessed with phase place data and inverting, it is possible to obtain the Electrical distribution situation of underground medium.
Understand that (e is the nature truth of a matter, e=to electromagnetic field decay to earth's surface intensity 1/e according to Kelvin effect
2.718281828459) depth when is skin depth, and skin depth is considered as depth of exploration substantially：
In formula (3), ρ is resistivity, and it is frequency that unit is Ω m, f, and unit is Hz；H is depth of exploration, and unit is m.By
Formula (3) understands that depth of exploration increases with the reduction of frequency.
MT method can penetrate, due to make use of the inductively effect of alternating electromagnetic field, the height that DC detecting deep is difficult to penetrate
Resistance layer, and due to natural Investigation On Plane Wave Characteristics, therefore transversal effect is little.In addition, Natural electromagnetic field is distributed on wider frequency band
(10-4～105Hz), as long as therefore selecting suitable frequency range, MT method can be with Underground hundreds of meters to several hundred kilometers depth bounds
Interior electrical change, these features of MT method make the exploration of oil equal energy source and research tectonics, particularly study greatly
A kind of highly effective method of ground Deep Electrical layering.However, when Application of Mt is disposed, depth measurement point can not be too
Few too sparse.If depth measurement point is too sparse very little, one-dimensional inversion can only be done to MT data, it is impossible to do two-dimentional or even three-dimensional
Inverting.One-dimensional inversion hypothetically descends resistivity of media in layered distribution, and actual underground medium is difficult to meet this it is assumed that one-dimensional anti-
Drill poor reliability, it is impossible to ensure the reliability of the deep resistivity information that magnetotelluric method is obtained.
3) current potential fitting process measurement the earth electrical parameter
Current potential fitting process is previously given pole location model, carries out ground potential calculating, by being reasonably constantly changing pole
Location soil resistivity value and its distribution so that the potential theory computable value with test value of each point is mutually fitted.Current potential fitting process works
It is carried out in two steps：
The first step：Field test.In the suitable position in tested pole location, one small-sized simulation electrode is installed (to be proposed with
Annular), an auxiliary electrode is installed where away from simulation electrode (being preferably not less than 10km), rents neighbouring distribution wire
Road, mutually or biphase by therein one, connect two test electrodes after sealing in experiment power supply, another measurement current potential that mutually gives over to is used.Examination
When testing, to the DC current of simulation electrode injection certain value (preferably greater than 5A), while surveying between two electrode midpoints in simulation electrode
Amount potential rise.Current potential measure-point amount should be enough, where potential change is big measuring point answer closeer, otherwise can be diluter.In a word
The Potential distribution curve for measuring should be made to have good seriality.
Second step：Reverse simulation.The Potential distribution curve that first should be obtained according to test and shape, in combination with pole location area
Geologic information, estimates the soil resistivity parameter layering of pole location, that is, provides initial value；Then calculated and simulation examination using computer
Test the current potential of identical measuring point.By constantly changing initial value, until Theoretical Calculation is matched with analog reslt or compares kiss
Close, given initial value now can be used as the design of pole location soil resistivity parameter and calculate Electrical Models.
As current potential fitting process simulates earthing pole ruuning situation, the parameter for therefore being obtained is true and reliable, particularly suitable
In pole location soil parameters complex distribution (if any mountain, lake, irrigation canals and ditches etc.) area, and hundreds of meters is to the electric resistance of soil of several kilometers of depths
Rate value is measured.But, current potential fitting process is not the method for measuring soil resistivity, and it is simply by the means of " reverse simulation "
To revise the resistivity Model of people's foundation.Due to layered medium hypothesis, participate in fitting data are limited, solve inverting more
Property the reason such as strong, the resistivity Model for obtaining through overpotential fitting process correction is also difficult to evaluate its reliability.
Above analysis shows, consider, existing soil resistivity measuring method is also needed to from practicality and effectiveness angle
Optimize and develop, the requirement of complex condition soil resistivity measurement could be met.
Content of the invention
For the problems referred to above, it is an object of the invention to provide a kind of earth electrode field and its Soil Surrounding resistivity are three-dimensional visiting
Method and system is surveyed, which achieves small range and large-scale fine degree is taken into account, and measurement result reliability is higher.
For achieving the above object, the present invention takes technical scheme below：A kind of earth electrode field and its Soil Surrounding resistance
Rate three-dimensional detection method, which comprises the following steps：1) according to initial ground pole pole location scale deployments measuring point；2) each measuring point is gathered
Coordinate data；3) time series data of each measuring point is gathered；4) according to coordinate data and the time serieses number of each measuring point for obtaining
According to carrying out data processing and 3-d inversion, obtain practically descending the 3 D resistivity structure of geological condition.
Before the scale deployments measuring point of initial ground pole pole location, methods described is further comprising the steps of：Deployment is intended in collection
The ground connection geology of polar region, geography, hydrological data, and analyze and obtain initial earth electrode field scope.
The step 1) in, it is audio-frequency magnetotelluric magnetic method and big according to the method for initial ground pole pole location scale deployments measuring point
The method that ground electromagnetic method combines.
The step 2) in, the coordinate data of each measuring point is the earth of all measuring points by high precision measuring instrument to disposing
Coordinate and elevation are measured obtaining.
The step 3) in, the time series data of each measuring point is by mt instrument system according to MT skill relevant with AMT
Art code requirement carries out what field data collection was obtained to each measuring point.
The step 4) in, related data is processed and the concrete grammar of 3-d inversion is：1. impedance tensor is adopted
ROBUST method of estimation, carries out pretreatment to AMT, MT time series data of each measuring point, obtains the impedance data of each measuring point, and
The MAGNETOTELLURIC RESPONSE ON data of each measuring point, the i.e. apparent resistivity of each measuring point and phase information are obtained further；2. each to obtained
The MAGNETOTELLURIC RESPONSE ON data of measuring point carry out consistency check, reject irrational data point；3. to step 2. in the institute that obtains
The apparent resistivity data for having measuring point carries out Static Correction analysis and correction；4. coordinate data to each measuring point and step 3. in regard
Resistivity and step 2. in phase data carry out 3-d inversion, obtain the 3 D resistivity model of underground medium.
The method that the audio-frequency magnetotelluric magnetic method and magnetotelluric method combine is specially：According to initial ground pole pole location model
Enclose, area rule dense deployment audio magnetotelluric method measuring point, if local exploratory area is limited by landform, atural object, audio frequency
The irregular dense deployment of mt measuring point area, but with relatively regular covering exploration area as principle；According to initial ground pole pole
Location scope, the sparse deployment mt measuring point of area rule；Equally, if some areas are limited by landform, atural object, bigly
The irregularly sparse deployment of electromagnetism measuring point area, but with relatively regular covering exploration area as principle.
A kind of earth electrode field and its Soil Surrounding resistivity three-dimensional detection system, it is characterised in that the system includes：With
In the measuring point deployment module according to initial ground pole pole location scale deployments measuring point；For gathering the seat of each measuring point coordinate data
Mark data acquisition module；For gathering the time series data acquisition module of each measuring point time series data；And according to described
The coordinate data and time series data of each measuring point carries out the data extraction and transformation module of data processing and 3-d inversion.
The system also includes the initial acquisition for gathering the geology for intending deployment ground connection polar region, geography, hydrological data
Module, and for obtaining the analysis module of initial ground pole pole location scope according to the geology, geography, analysis of hydrological data.
The method that the measuring point deployment module is combined using audio-frequency magnetotelluric magnetic method and magnetotelluric method, according to initially connecing
Earth polar pole location scale deployments measuring point.
The present invention is due to taking above technical scheme, and which has advantages below：1st, the present invention is due to using AMT method and MT method
The method for combining is to carrying out measuring point deployment inside and outside earth electrode field scope, it is achieved that small range and on a large scale fine degree are simultaneous
Turn round and look at, nearby a small range electrical resistivity results are fine for earth electrode field, meet addressing, the exploration of earthing pole location and build location needs；Ground connection
Internal resistance rate result is rough on a large scale for pole pole location, meets addressing assessment needs.2nd, the present invention is due to using AMT method to earthing pole pole
Measuring point deployment is carried out in the range of location, it is ensured that the fine degree of soil superficial part electrical resistivity results near earth electrode field.3rd, this
Bright due to adopt MT method in the range of earth electrode field with which near sparse on a large scale deployment MT measuring point, not only ensure that ground connection
The reliability of pole pole location deep resistivity result on a large scale, also effectively reduces running cost.4th, the present invention is due to adopting three
Dimension inversion method carries out joint inversion to the related data of AMT method and MT method measuring point, inherently using superficial part fine structure about
Bundle DEEP STRUCTURE, further ensures the reliability of deep result, has obtained meeting practically to descend the three-dimensional resistance of geological condition
Rate structure, solves a difficult problem for complex condition soil resistivity modeling.
Description of the drawings
Fig. 1 is existing winner four-electrode method wiring diagram；
Fig. 2 is magnetotelluric method of the present invention (MT method) and audio-frequency magnetotelluric magnetic method (AMT method) measuring point scattergram, wherein zero generation
Table MT measuring point, * represents AMT measuring point, and black wire represents initial ground pole pole location scope；
Fig. 3 is that MT method of the present invention and AMT method data are processed and inverting flow process figure.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described in detail.
Earth electrode field of the present invention and its Soil Surrounding resistivity three-dimensional detection method are comprised the following steps：
1) gather related data and comprehensive analysis are carried out, obtain initial earth electrode field scope.
Collection intends disposing the related data of the aspects such as the geology on a large scale for being grounded polar region, geography, the hydrology carries out total score
Analysis, the earth diverging portion, the particularly soil resistivity for selecting broad and electric conductivity good is in below 100 Ω m, soil moisture
Many, thermal capacity height, and the area for conducting electricity very well is used as initial earth electrode field scope.
2) as shown in Fig. 2 the method for being combined using audio-frequency magnetotelluric magnetic method (AMT method) and magnetotelluric method (MT method) is existed
Measuring point is disposed in the range of the pole location of initial ground pole and its nearby.
In earth electrode field soil resistivity exploration work, in order to ensure earth electrode field soil shallow resistivity nearby
As a result fine degree and the on a large scale reliability of deep resistivity result, the present invention using AMT method (frequency range 10～
10000 hertz) and the method that combines of MT method (0.001～320 hertz of frequency range) measuring point is disposed, i.e.,：
According to initial ground pole pole location scope, preferably in the range of the pole location of initial ground pole, area rule dense deployment
AMT measuring point, and then obtain the resistivity information in earth electrode field 1000 meters of depth of scope.If local exploratory area is by ground
The factors such as shape, atural object are limited, then AMT measuring point irregularly can also be disposed, but with relatively regular covering exploration area as principle.
According to initial ground pole pole location scope, preferably in the range of the pole location of initial ground pole and its near interior on a large scale,
The sparse deployment MT measuring point of area rule, and then obtain earth electrode field resistivity information on a large scale as deep as tens kilometers.With
Sample, if local exploratory area is limited by factors such as landform, atural objects, MT measuring point irregularly can also be disposed, but with relatively regular
Covering exploration area is principle.
3) using high precision measuring instrument (as differential GPS), the geodetic coordinates of all measuring points disposed and elevation are surveyed
Fixed, obtain the coordinate data of each measuring point.
4) mt instrument system is adopted, according to MT demand of technical standard relevant with AMT, field is carried out to each measuring point
Data acquisition, obtains the time series data of each measuring point.
5) coordinate data of each measuring point for being obtained according to field acquisition and time series data, carry out data processing and three-dimensional
Inverting, obtains meeting practically to descend the 3 D resistivity structure of geological condition.
As shown in figure 3, specific data processing and 3-d inversion flow process are：
1. impedance tensor ROBUST method of estimation is adopted, pretreatment is carried out to AMT, MT time series data of each measuring point,
The impedance data of each measuring point is obtained, and obtains the MAGNETOTELLURIC RESPONSE ON number such as apparent resistivity and phase information of each measuring point further
According to.
2. the MAGNETOTELLURIC RESPONSE ON data to obtaining carry out consistency check, reject irrational data point.
As magnetotelluric method is the method based on natural field, electromagnetic signal is weak, easily receives various noise jamming, occurs abnormal
Become.So needing to carry out consistency check to MAGNETOTELLURIC RESPONSE ON data, i.e., mt apparent resistivity and phase data are compiled
Volume, filtering, consistency analysis and correction process, reject irrational data point, eliminate the impact of distortion data.
3. to step 2. in the apparent resistivity data of all measuring points that obtains carry out Static Correction analysis and correction.
Processed due to shallow earth's surface office using the Static Correction analysis method such as curvilinear translation method, spatial filtering method or joint inversion
The Static Correction problem that portion's anomalous body causes, the apparent resistivity of all measuring points to obtaining carries out Static Correction analysis and correction, compacting
Or eliminate impact of the Static Correction to inversion result.
4. coordinate data to each measuring point and step 3. in apparent resistivity and step 2. in phase data carry out three
Dimension inverting, obtains the resistivity models of actual underground medium.
The related data of the AMT and MT method for being obtained based on above-mentioned steps, using three-dimensional fast relaxation inverting or conjugate gradient
The 3-d inversion such as inverting method carries out joint inversion, obtains meeting practically to descend the 3 D resistivity structure of geological condition.
The present invention also proposes a kind of suitable for above-mentioned earth electrode field and its Soil Surrounding resistivity three-dimensional detection method
System, the system includes：For gathering the initial acquisition module of the geology for intending deployment ground connection polar region, geography, hydrological data；With
In the analysis module for obtaining initial ground pole pole location scope according to the geology, geography, analysis of hydrological data；For initially connecing
In the range of the location of the earth polar pole and its neighbouring measuring point deployment module of deployment measuring point；For gathering the coordinate data of each measuring point coordinate data
Acquisition module；For gathering the time series data acquisition module of each measuring point time series data；And the seat according to each measuring point
Mark data and time series data carry out the data extraction and transformation module of data processing and 3-d inversion.
Wherein, the method that measuring point deployment module is combined using audio-frequency magnetotelluric magnetic method and magnetotelluric method, according to initial
Earth electrode field scale deployments measuring point.
The various embodiments described above are merely to illustrate the present invention, the wherein preprocess method of the acquisition method data of related data
Can all be varied from inversion method etc., every equivalents for carrying out on the basis of technical solution of the present invention and change
Enter, all should not exclude outside protection scope of the present invention.
Claims (10)
1. a kind of earth electrode field and its Soil Surrounding resistivity three-dimensional detection method, which comprises the following steps：
1) according to initial ground pole pole location scale deployments measuring point；
2) coordinate data of each measuring point is gathered；
3) time series data of each measuring point is gathered；
4) according to coordinate data and the time series data of each measuring point for obtaining, data processing and 3-d inversion is carried out, obtains reality
The 3 D resistivity structure of border subsurface geology situation.
2. a kind of earth electrode field and its Soil Surrounding resistivity three-dimensional detection method as claimed in claim 1, its feature exists
In：Before the scale deployments measuring point of initial ground pole pole location, methods described is further comprising the steps of：
The deployment ground connection geology of polar region, geography, hydrological data are intended in collection, and analyze and obtain initial earth electrode field scope.
3. a kind of earth electrode field and its Soil Surrounding resistivity three-dimensional detection method as claimed in claim 1, its feature exists
In：The step 1) in, it is audio-frequency magnetotelluric magnetic method and the earth electricity according to the method for initial ground pole pole location scale deployments measuring point
The method that magnetic method combines.
4. a kind of earth electrode field and its Soil Surrounding resistivity three-dimensional detection method as claimed in claim 1, its feature exists
In：The step 2) in each measuring point coordinate data be by high precision measuring instrument to dispose all measuring points geodetic coordinates and
Elevation is measured obtaining.
5. a kind of earth electrode field and its Soil Surrounding resistivity three-dimensional detection method as claimed in claim 1, its feature exists
In：The step 3) in, the time series data of each measuring point is by mt instrument system according to MT technical specification relevant with AMT
Require to carry out each measuring point what field data collection was obtained.
6. a kind of earth electrode field and its Soil Surrounding resistivity three-dimensional detection method as claimed in claim 1, its feature exists
In：The step 4) in, related data is processed and the concrete grammar of 3-d inversion is：
1. impedance tensor ROBUST method of estimation is adopted, pretreatment is carried out to AMT, MT time series data of each measuring point, is obtained
The impedance data of each measuring point, and obtain the MAGNETOTELLURIC RESPONSE ON data of each measuring point, the i.e. apparent resistivity of each measuring point and phase further
Position information；
2. the MAGNETOTELLURIC RESPONSE ON data of each measuring point to obtaining carry out consistency check, reject irrational data point；
3. to step 2. in the apparent resistivity data of all measuring points that obtains carry out Static Correction analysis and correction；
4. coordinate data to each measuring point and step 3. in apparent resistivity and step 2. in phase data carry out three-dimensional anti-
Drill, obtain the 3 D resistivity model of underground medium.
7. a kind of earth electrode field and its Soil Surrounding resistivity three-dimensional detection method as claimed in claim 3, its feature exists
In：The method that the audio-frequency magnetotelluric magnetic method and magnetotelluric method combine is specially：
According to initial ground pole pole location scope, area rule dense deployment audio magnetotelluric method measuring point, if local exploration ground
Area is limited by landform, atural object, then the irregular dense deployment of audio magnetotelluric method measuring point area, but with relatively regular covering exploration area
For principle；
According to initial ground pole pole location scope, the sparse deployment mt measuring point of area rule；Equally, if some areas are received
Landform, atural object are limited, then mt measuring point area irregularly sparse deployment, but with relatively regular covering exploration area as principle.
8. a kind of earth electrode field and its Soil Surrounding resistivity three-dimensional detection system, it is characterised in that the system includes：
For the measuring point deployment module according to initial ground pole pole location scale deployments measuring point；
For gathering the coordinate data acquisition module of each measuring point coordinate data；
For gathering the time series data acquisition module of each measuring point time series data；
And the coordinate data according to each measuring point and time series data are carried out at the data of data processing and 3-d inversion
Reason and inverting module.
9. a kind of earth electrode field and its Soil Surrounding resistivity three-dimensional detection system as claimed in claim 8, its feature exists
In, the system also includes the initial acquisition module for gathering the geology for intending deployment ground connection polar region, geography, hydrological data, and
For obtaining the analysis module of initial ground pole pole location scope according to the geology, geography, analysis of hydrological data.
10. a kind of earth electrode field and its Soil Surrounding resistivity three-dimensional detection system as claimed in claim 8, its feature exists
In the method that the measuring point deployment module is combined using audio-frequency magnetotelluric magnetic method and magnetotelluric method, according to initial ground pole
Pole location scale deployments measuring point.
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| CN111259558A (en) * | 2020-01-21 | 2020-06-09 | 武汉大学 | Method for three-dimensional visualization of colloid motion distribution in unsaturated soil |
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| CN111707714A (en) * | 2020-06-24 | 2020-09-25 | 中国地质大学（武汉） | Soil organic chloride pollution rapid investigation device and method based on complex resistivity |
| CN113126172A (en) * | 2020-01-16 | 2021-07-16 | 中国石油天然气集团有限公司 | Static displacement correction method and device |
| CN114047554A (en) * | 2021-11-05 | 2022-02-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Earth resistivity model modeling method and device, computer equipment and storage medium |
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