CN113703058A - Method for detecting underground obstacle by utilizing apparent conductivity and relative dielectric constant - Google Patents
Method for detecting underground obstacle by utilizing apparent conductivity and relative dielectric constant Download PDFInfo
- Publication number
- CN113703058A CN113703058A CN202111025806.2A CN202111025806A CN113703058A CN 113703058 A CN113703058 A CN 113703058A CN 202111025806 A CN202111025806 A CN 202111025806A CN 113703058 A CN113703058 A CN 113703058A
- Authority
- CN
- China
- Prior art keywords
- conductivity
- obstacles
- apparent conductivity
- relative permittivity
- underground
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 claims description 27
- 238000012545 processing Methods 0.000 claims description 21
- 238000005259 measurement Methods 0.000 claims description 12
- 238000009412 basement excavation Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 7
- 230000003068 static effect Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000012795 verification Methods 0.000 claims description 5
- 230000000007 visual effect Effects 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000002596 correlated effect Effects 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 17
- 230000004888 barrier function Effects 0.000 abstract description 7
- 238000011835 investigation Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
Abstract
The invention provides a method for detecting underground obstacles by utilizing apparent conductivity and relative permittivity, which can directly measure the distribution condition of the apparent conductivity in a work area by measuring the apparent conductivity, defining the horizontal position, reflecting the relative permittivity, determining the burying depth and determining the position of the obstacles and utilizing a ground conductivity meter. And then according to the horizontal position, establishing a geological radar survey line for detailed investigation, and finally comprehensively determining the three-dimensional distribution condition of the underground obstacles by combining the geological radar profile result. The invention improves the working efficiency, simultaneously realizes the accurate three-dimensional positioning of the underground barrier and provides reliable guarantee for the later safety construction.
Description
Technical Field
The invention belongs to the field of building construction, and particularly relates to a method for detecting underground obstacles by utilizing apparent conductivity and relative dielectric constant.
Background
The urban building process is often influenced by the existing building structure, so that the construction difficulty of the foundation part of the building structure construction is high, and complicated geological conditions, such as underground obstacles, are influenced, so that the construction is difficult, and meanwhile, the urban building process also faces safety risks. Before construction, a work area is usually excavated, and underground obstacles which influence subsequent construction in the work area are removed. However, the blind excavation not only damages the actual geological conditions in the work area, but also increases a lot of workload and invests more manpower and material resources. Therefore, necessary engineering exploration must be carried out on the foundation part before construction, and geological structure prejudgment and prediction are well carried out. The engineering geophysical prospecting technique is a method of identifying the size and nature of a target body by analyzing the observed geophysical field, using the difference between the physical properties of the target body and the surrounding environment. Urban underground barriers are usually in the form of building foundations, underground structures and underground unidentified barriers, and have different physical properties with respect to the surrounding environment, such as dielectric constant, conductivity and the like.
The geological radar is one of geophysical prospecting methods in advanced geological detection category, has the advantages of continuity, no damage, high efficiency, high precision and the like, belongs to a short-distance geological detection method, and is particularly suitable for detecting karst caves, faults, water-rich rock stratums and the like in karst areas. Compared with seismic wave reflection, the geological radar has the advantages of strong timeliness, simple and convenient equipment, simple and convenient operation, capability of rapidly carrying out detection work on site and wide application at home and abroad. In recent years, geological radar detection methods are generally adopted for detecting urban underground obstacles, the methods are based on the difference of relative dielectric constants of different media for detection, and the methods are simple and convenient in equipment, simple to operate and obvious in imaging effect, so that the methods are widely applied. Although the method has relatively high resolution for underground obstacles, the distribution situation of the underground obstacles inside the profile can be obtained, and the buried situation outside the profile is unknown. For a large-area construction work area, the construction period is usually tight, if only geological radar is adopted to detect unknown underground obstacles, multiple measuring lines are required to be involved for detection, the workload is huge, the time consumption is long, the cost is high, the data volume is large, and the processing is complex.
The measurement of the earth conductivity is usually used in the fields of leakage exploration of dams, reservoir areas, rivers and lakes, dam foundation quality detection, underground water exploration, soil salinity detection and the like, and has achieved good social and economic benefits. The geodetic conductivity meter mainly comprises a signal transmitting end and a receiving end, wherein the transmitting end transmits a primary magnetic field which changes along with time, very weak alternating current induction current is generated in the ground along with the primary magnetic field, a secondary magnetic field is induced by the current, the primary magnetic field and the secondary magnetic field are received by the receiving end, the ratio of the secondary magnetic field to the primary magnetic field is in positive correlation with the conductivity, and the apparent conductivity distribution of the ground can be directly calculated. The device can measure the apparent conductivity without contacting the ground, does not need to be provided with any probe, and is simple and quick in survey. The device can be used for conducting ground electric conductivity investigation, the required time can be greatly shortened, and the working efficiency is obviously improved.
At present, a comprehensive detection means based on a geodetic conductivity meter and a geological radar is applied to detection of hidden dangers of dam engineering, and the detection of underground obstacles is still an unknown field. Typically, urban underground obstacles have differences in conductivity and permittivity from the surrounding environment, and thus detection by a combination of geoconductivity and geological radar is feasible. Generally, only utilize geological radar to carry out large tracts of land construction work area underground obstacle detection, its work efficiency is low, when the underground obstacle distribution situation of work area is unknown, blind work in earlier stage needs roughly fix out the horizontal distribution situation of obstacle thing, then surveys it in detail, confirms its depth direction buried state, and then concludes the three-dimensional distribution situation of obstacle, and this has important meaning to later stage safety construction.
Disclosure of Invention
In view of the above, the present invention is directed to a method for detecting an underground obstacle by using apparent conductivity and relative permittivity, which detects an underground obstacle by using information of the apparent conductivity and the relative permittivity, improves work efficiency, and simultaneously achieves accurate three-dimensional positioning of the underground obstacle, thereby providing a reliable guarantee for later safety construction.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for detecting subsurface obstacles using apparent conductivity and relative permittivity, comprising the steps of;
s1, measuring the apparent conductivity; carrying out area blind detection by using a geodetic conductivity meter, and obtaining the plane apparent conductivity condition through data processing;
s2, circling the horizontal position; according to the conductivity information and the actual situation of the detection ground, the horizontal position of the target geologic body is defined;
s3, reflecting the relative dielectric constant; according to the horizontal position of the target geologic body defined in S2, radar survey lines are laid by using a geological radar for detailed exploration, a radar data profile is obtained through data processing, and the profile can reflect underground relative dielectric constant information;
s4, determining the buried depth; determining the buried depth of the target geologic body in detail by combining the relative dielectric constant information reflected by the section in the S3;
s5, determining the position of the obstacle and verifying; and determining the three-dimensional position of the underground obstacle by integrating the information of the apparent conductivity and the relative dielectric constant, and carrying out excavation verification on the detection result.
Furthermore, the earth conductivity meter comprises a signal transmitting end and a receiving end, wherein the signal transmitting end transmits a time-varying primary magnetic field when in operation
In the earth, very weak alternating current currents are consequently generated which induce secondary magnetic fields
Magnetic field of origin
And secondary magnetic field
Are all received by the receiving end, the ratio of the secondary magnetic field to the primary magnetic field is positively correlated with the conductivity, namely
；
Wherein the content of the first and second substances,
in order to be the angular frequency of the frequency,
is the transmit frequency in Hz;
is the earth conductivity with the unit of S/m; s is the distance between the transmitting end and the receiving end, and the unit is m;
is a vacuum magnetic permeability.
Further, area blind probing in S1; the full coverage mode is usually adopted according to the size of a work area, so that the aim of quickly and intuitively obtaining the ground electric conductivity distribution condition in the whole work area is fulfilled; the full coverage mode is to arrange the measuring lines along the north-south direction, and the acquisition sequence is S-shaped, parallel or latticed.
Further, the data in S1 is conductivity data at each measurement point, and the scatter data needs to be gridded by software or a program, so that the conductivity distribution in the entire work area can be obtained.
Further, in S2, the measurement of the earth conductivity is based on the conductivity difference of the underground medium, and the difference between the conductivity of the target geologic body and the conductivity of the surrounding environment reflects the position of the target geologic body.
Further, in S3, the radar survey lines are arranged perpendicular or oblique to the strike of the target geologic body.
Further, in S3, the data processing includes static correction, first-arrival wave truncation, energy compensation, background removal, and filtering processing.
Further, in S4, different strong reflection signals are formed at the interface between different media of the electromagnetic wave, and the morphology and specific position information of the anomaly are read out according to the wave characteristics.
Further, in S5, the horizontal position of the target geologic body is determined by visual inspection according to the conductivity distribution in the plane of the work area, and then the buried depth and the horizontal distribution position of the target geologic body are detected by a geological radar in detail, so as to determine the three-dimensional distribution of the underground obstacles.
Compared with the prior art, the method for detecting underground obstacles by utilizing apparent conductivity and relative permittivity has the following advantages:
(1) the invention uses the earth electric conductivity meter to carry out area blind test in advance, directly calculates the earth apparent electric conductivity, and can rapidly define the horizontal position of the underground obstacle which is possibly distributed.
(2) According to the invention, a geological radar survey line is established according to the distribution condition of the apparent conductivity, so that the geological radar is detected in detail, and the working efficiency is greatly improved.
(3) By utilizing the apparent conductivity and the relative dielectric constant information to detect the underground barrier, the working efficiency is improved, meanwhile, the accurate three-dimensional positioning of the underground barrier is realized, and the reliable guarantee is provided for the later safety construction.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a method of detecting subsurface obstructions using apparent conductivity and relative permittivity in accordance with the present invention;
FIG. 2 is a schematic diagram of a full coverage test line for earth conductivity detection in accordance with the present invention;
FIG. 3 is a plan view conductivity distribution and geological radar profile of the present invention;
FIG. 4 is a schematic diagram of the buried depth of a target geologic body according to the present invention;
FIG. 5 is a block flow diagram of a method of detecting subsurface obstructions using apparent conductivity and relative permittivity in accordance with the present invention.
Description of reference numerals:
1. and (6) measuring a line by a radar.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A method for detecting subsurface obstacles using apparent conductivity and relative permittivity, comprising the steps of;
s1, measuring the apparent conductivity; carrying out area blind detection by using a geodetic conductivity meter, and obtaining the plane apparent conductivity condition through data processing;
s2, circling the horizontal position; according to the conductivity information and the actual situation of the detection ground, the horizontal position of the target geologic body is defined;
s3, measuring the relative dielectric constant; according to the horizontal position of the target geologic body defined in S2, a radar survey line 1 is laid by using a geological radar for detailed exploration, a radar data profile is obtained through data processing, and the profile can reflect underground relative dielectric constant information;
s4, determining the buried depth; determining the buried depth of the target geologic body in detail by combining the relative dielectric constant information reflected by the section in the S3;
s5, determining the position of the obstacle and verifying; and determining the three-dimensional position of the underground obstacle by integrating the information of the apparent conductivity and the relative dielectric constant, and carrying out excavation verification on the detection result.
Preferably, in S1, before the exploration, the region needs to be surveyed, the geological and stratigraphic conditions inside the region need to be known, the interpretation of the later data is of great significance,
preferably, in S1, the earth conductivity measurement is a detection means for solving practical problems by studying spatial and temporal distribution characteristics of electromagnetic field based on the conductivity difference of the underground medium; the earth conductivity meter can directly measure the plane apparent conductivity distribution condition inside the work area; the earth conductivity meter comprises a signal transmitting end and a receiving end, wherein the signal transmitting end transmits a time-varying primary magnetic field when in operation
Very weak AC induced currents are then generated in the earth, whichCurrent induced secondary magnetic field
Magnetic field of origin
And secondary magnetic field
Are all received by the receiving end, the ratio of the secondary magnetic field to the primary magnetic field is positively correlated with the conductivity, namely
；
Wherein the content of the first and second substances,
in order to be the angular frequency of the frequency,
is the transmit frequency in Hz;
is the earth conductivity with the unit of S/m; s is the distance between the transmitting end and the receiving end, and the unit is m;
is a vacuum magnetic permeability. Therefore, according to the formula, the earth conductivity meter can rapidly measure the underground apparent conductivity in a non-contact manner.
Preferably, area blind probing in S1; the full coverage mode is usually adopted according to the size of a work area, so that the aim of quickly and intuitively obtaining the ground electric conductivity distribution condition in the whole work area is fulfilled; the full coverage mode is to arrange the measuring lines along the north-south direction, and the acquisition sequence is S-shaped, parallel or latticed.
Preferably, the data in S1 is the conductivity data at each measuring point, measured by using the earth conductivity, and then the scatter data needs to be gridded by using software or a program, so that the conductivity distribution in the whole working area can be obtained.
Preferably, in S2, since the geodetic conductivity measurement is based on the conductivity difference of the underground medium, when there is a difference in conductivity between the target geologic body and the surrounding environment, the target geologic body position can be reflected. Therefore, the approximately horizontal position of the target geologic body can be defined directly by visual inspection.
Preferably, in S3, the geological radar is to emit electromagnetic waves through the antenna, and when the electromagnetic waves propagate in the target formation, if a geological anomaly exists in the target formation, the electrical parameters of the target formation may change, so that the electromagnetic waves are reflected and refracted at the interface of the anomaly, and the reflected waves are received along the echo path. By analyzing the reflection characteristics of the reflected waves, the relative dielectric constant information of the underground geologic body can be reflected, and the geological condition in the target stratum can be forecasted. In order to further detect the buried position of the target geologic body, the construction period is saved, the geological radar measuring line 1 does not need to be arranged in the whole work area, only the abnormal position reflected by the visual conductivity information needs to be detected, the arrangement of the radar measuring line 1 is perpendicular or oblique to the trend of the target geologic body, and the smooth operation of the measurement is ensured.
Further, in S3, the data processing includes static correction, first-arrival wave truncation, energy compensation, background removal, and filtering processing; and the data processing comprises the steps of carrying out static correction, first-arrival wave interception, energy compensation, background removal and filtering on the actually measured radar section data to obtain processed section data, wherein the data can reflect the relative dielectric constant information of the underground geologic body. The static correction can correct the data to the same reference surface, so that the influence of the undulating terrain on the data quality is inhibited, and the subsequent data processing is facilitated. If the ground is flat, static correction processing is not needed; intercepting the first-motion wave to remove the interference of the first-motion wave; energy compensation is to compensate waveform energy, and energy attenuation is caused by the actions of absorption, reflection, transmission and the like of the stratum after electromagnetic waves enter the ground. Therefore, the deeper the detection depth is, the weaker the electromagnetic wave energy is, and the signal intensity can be increased through energy compensation processing, thereby being beneficial to the subsequent interpretation work; background removal, namely removing noise in periodic horizontal and near-horizontal directions; the filtering process is used to filter data to suppress random noise other than the effective signal as much as possible.
Preferably, in S4, since the electromagnetic wave forms a strong reflection signal at the interface between different media, i.e. reflects the relative permittivity of the target geologic body, the geologic radar profile is analyzed, and the anomaly morphology and specific position information, i.e. the buried depth in the horizontal direction and the depth direction, can be directly read out according to the waveform characteristics.
Preferably, in S5, the method of determining the conductivity and the relative permittivity is integrated, that is, the horizontal position of the target geologic body is determined by visual observation according to the conductivity distribution in the plane of the work area, and then the buried depth and the horizontal distribution position of the target geologic body are detected by the geological radar, so as to determine the three-dimensional distribution of the underground obstacles.
Example (b):
1. according to the condition of a construction work area, firstly, carrying out area blind detection by using a geodetic conductivity meter, and obtaining the plane apparent conductivity distribution condition through data processing; the earth conductivity meter can measure the underground conductivity quickly and in a non-contact manner, and can directly generate earth apparent conductivity plane imaging results. Area blind probing typically uses a full coverage mode depending on the size of the work area. In the present example, the earth conductivity measurement is performed in the form of continuous measurement, and other projects may adopt point measurement or continuous measurement exploration modes according to actual conditions. In an actual work area, there may be, for example, some aboveground abandoned buildings, which need to go around, as shown in fig. 2; the ground conductivity planar imaging method uses a CMD-Explorer ground conductivity instrument of Czech GF company, and adopts a vertical dipole Auto mode, the sampling frequency is 1s, and the line spacing is 1 m.
The apparent conductivity data can be directly derived from the earth conductivity meter and can be directly gridded by Surfer software to obtain the plane apparent conductivity distribution, as shown in fig. 3. According to the actual geology and stratum conditions of the work area, the conductivity of the black high-value area is more than 120 mS/m, and the black high-value area is presumed to be a metal barrier; the white areas show moderate conductivity, about 40-120 mS/m, presumably plain fill; whereas the grey areas have a relatively low conductivity, mostly less than 40 mS/m, presumably building waste.
2. According to the conductivity information, the approximate horizontal position of the target geologic body is defined; the target geologic body is circled to be in a horizontal position by visual observation according to the difference of the electrical conductivity between the target geologic body and the surrounding environment, as shown by a dotted ellipsoid frame in figure 3, and the trend direction of the horizontal position is approximately in the long axis direction of the ellipsoid.
3. Establishing a geological radar survey line 1 for detailed exploration, and obtaining a radar data profile through data processing; the geological radar used is the CO730 series radar system of ImpulseRadar, sweden. The radar antenna is used at this time, the dominant frequency is 300MHz, the point distance is 0.05m, the time window is 156.25ns, and the comprehensive wave speed is 0.1 m/ns. The geological radar survey 1 is laid out generally perpendicular or oblique to the target geologic volume, as shown by the solid line in figure 3.
4. Determining the buried depth of the target geologic body in detail by combining the relative dielectric constant information; and processing the radar data according to the relative dielectric constant difference in different media, wherein the engineering data processing uses Reflexw software to perform static correction, first-arrival wave interception, energy compensation, background removal and filtering processing, so as to obtain a final radar profile. The data is interpreted to further determine the buried depth of the target geologic body, as shown in the box position of fig. 4. The top of the radar section at the position 69-73m of the measuring line and the depth of 0.8m forms a discontinuous reflected wave group, the internal waveform structure is disordered, the diffracted waves are obvious, and the multiples are obvious.
5. Determining the three-dimensional position of the underground barrier by integrating the information of the apparent conductivity and the relative dielectric constant, and performing excavation verification on the detection result; and determining the three-dimensional position of the underground obstacle by integrating the apparent conductivity and the relative permittivity information. The construction waste in the abnormal area is presumed to exist at the position of 69-73m in the horizontal direction and 0.8m in the depth direction according to the actual conditions of the site. After excavation verification is carried out on the working area of the embodiment, the underground obstacle burying condition is presumed to be basically consistent with the position of the construction waste shown by the actual excavation point position.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method for detecting subsurface obstacles using apparent conductivity and relative permittivity, comprising the steps of;
s1, measuring the apparent conductivity; carrying out area blind detection by using a geodetic conductivity meter, and obtaining the plane apparent conductivity condition through data processing;
s2, circling the horizontal position; according to the conductivity information and the actual situation of the detection ground, the horizontal position of the target geologic body is defined;
s3, reflecting the relative dielectric constant; according to the horizontal position of the target geologic body defined in S2, radar survey lines are laid by using a geological radar for detailed exploration, a radar data profile is obtained through data processing, and the profile can reflect underground relative dielectric constant information;
s4, determining the buried depth; determining the buried depth of the target geologic body in detail by combining the relative dielectric constant information reflected by the section in the S3;
s5, determining the position of the obstacle and verifying; and determining the three-dimensional position of the underground obstacle by integrating the information of the apparent conductivity and the relative dielectric constant, and carrying out excavation verification on the detection result.
2. A method of detecting subsurface obstacles using apparent conductivity and relative permittivity as claimed in claim 1, wherein: the earth conductivity meter comprises a signal transmitting end and a receiving end, wherein the signal transmitting end transmits a time-varying primary magnetic field when in operation
In the earth, very weak alternating current currents are consequently generated which induce secondary magnetic fields
Magnetic field of origin
And secondary magnetic field
Are all received by the receiving end, the ratio of the secondary magnetic field to the primary magnetic field is positively correlated with the conductivity, namely
；
Wherein the content of the first and second substances,
in order to be the angular frequency of the frequency,
is the transmit frequency in Hz;
is the earth conductivity with the unit of S/m; s is the distance between the transmitting end and the receiving end, and the unit is m;
is a vacuum magnetic permeability.
3. A method of detecting subsurface obstacles using apparent conductivity and relative permittivity as claimed in claim 1, wherein: blind area probing in S1; the full coverage mode is usually adopted according to the size of a work area, so that the aim of quickly and intuitively obtaining the ground electric conductivity distribution condition in the whole work area is fulfilled; the full coverage mode is to arrange the measuring lines along the north-south direction, and the acquisition sequence is S-shaped, parallel or latticed.
4. A method of detecting subsurface obstacles using apparent conductivity and relative permittivity as claimed in claim 1, wherein: the data in S1 is conductivity data at each measurement point, and the conductivity distribution in the entire work area can be obtained by gridding the scattered point data with software or a program.
5. A method of detecting subsurface obstacles using apparent conductivity and relative permittivity as claimed in claim 1, wherein: in S2, the geodetic conductivity measurement is based on the conductivity difference of the underground medium, and the difference between the conductivity of the target geologic body and the conductivity of the surrounding environment reflects the position of the target geologic body.
6. A method of detecting subsurface obstacles using apparent conductivity and relative permittivity as claimed in claim 1, wherein: in S3, the layout of the radar survey lines is perpendicular to or oblique to the trend of the target geologic body.
7. A method of detecting subsurface obstacles using apparent conductivity and relative permittivity as claimed in claim 1, wherein: in S3, the data processing includes static correction, first-arrival wave truncation, energy compensation, background removal, and filtering.
8. A method of detecting subsurface obstacles using apparent conductivity and relative permittivity as claimed in claim 1, wherein: in S4, different strong reflection signals are formed at the interface of different media of the electromagnetic wave, and the abnormal body form and specific position information are read out according to the wave characteristics.
9. A method of detecting subsurface obstacles using apparent conductivity and relative permittivity as claimed in claim 1, wherein: in S5, the horizontal position of the target geologic body is defined by visual observation according to the conductivity distribution in the plane of the work area, and then the buried depth and the horizontal distribution position of the target geologic body are detected by geological radar in detail, so that the three-dimensional distribution condition of underground obstacles is determined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111025806.2A CN113703058A (en) | 2021-09-02 | 2021-09-02 | Method for detecting underground obstacle by utilizing apparent conductivity and relative dielectric constant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111025806.2A CN113703058A (en) | 2021-09-02 | 2021-09-02 | Method for detecting underground obstacle by utilizing apparent conductivity and relative dielectric constant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113703058A true CN113703058A (en) | 2021-11-26 |
Family
ID=78657374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111025806.2A Pending CN113703058A (en) | 2021-09-02 | 2021-09-02 | Method for detecting underground obstacle by utilizing apparent conductivity and relative dielectric constant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113703058A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114413841A (en) * | 2022-01-21 | 2022-04-29 | 中国科学院西北生态环境资源研究院 | Frozen soil zonal mapping method and device, electronic equipment and storage medium |
| CN114578348A (en) * | 2022-05-05 | 2022-06-03 | 深圳安德空间技术有限公司 | Autonomous intelligent scanning and navigation method for ground penetrating radar based on deep learning |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08122279A (en) * | 1994-10-21 | 1996-05-17 | Tobishima Corp | Underground relative dielectric constant measuring method and geological features measuring method and position measuring method |
| JP2004069388A (en) * | 2002-08-02 | 2004-03-04 | Nippon Engineering Consultants Co Ltd | Device and method for detecting abnormality in shallow underground |
| CN103499612A (en) * | 2013-10-14 | 2014-01-08 | 浙江水利水电学院 | Method for comprehensively geographically exploring hidden trouble of seawall engineering |
-
2021
- 2021-09-02 CN CN202111025806.2A patent/CN113703058A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08122279A (en) * | 1994-10-21 | 1996-05-17 | Tobishima Corp | Underground relative dielectric constant measuring method and geological features measuring method and position measuring method |
| JP2004069388A (en) * | 2002-08-02 | 2004-03-04 | Nippon Engineering Consultants Co Ltd | Device and method for detecting abnormality in shallow underground |
| CN103499612A (en) * | 2013-10-14 | 2014-01-08 | 浙江水利水电学院 | Method for comprehensively geographically exploring hidden trouble of seawall engineering |
Non-Patent Citations (7)
| Title |
|---|
| 张舒杰;吴健生;赵永辉;张新兵;: "综合物探方法在城市地下桩基地籍调查中的应用研究", 上海国土资源, no. 04 * |
| 杜晨程，邵阳英，胡勇峰等: "物探技术在海塘隐患探测的应用探讨", 浙江水利水电学院学报, vol. 26, no. 3, pages 28 - 34 * |
| 王俊茹, 吕继东: "地下障碍物雷达定位探测的技术应用", 地质与勘探, no. 03, pages 84 - 86 * |
| 秦鹏，高健，程春梅等: "大地电导率仪一探地雷达组合物探法在海堤工程隐患探测中的应用", 科技通报, vol. 33, no. 7, pages 233 - 236 * |
| 肖波;: "探地雷达在城市工程勘察中的应用", 科技广场, no. 03 * |
| 詹斌;廖智;朱能发;: "综合物探方法在顶管路径障碍物勘探中的应用", 石家庄铁路职业技术学院学报, no. 03 * |
| 郭建强著: "二氧化碳地质储存技术方法概论", 31 December 2014, 地质出版社, pages: 165 - 166 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114413841A (en) * | 2022-01-21 | 2022-04-29 | 中国科学院西北生态环境资源研究院 | Frozen soil zonal mapping method and device, electronic equipment and storage medium |
| CN114413841B (en) * | 2022-01-21 | 2024-02-27 | 中国科学院西北生态环境资源研究院 | Frozen soil zoning drawing method and device, electronic equipment and storage medium |
| CN114578348A (en) * | 2022-05-05 | 2022-06-03 | 深圳安德空间技术有限公司 | Autonomous intelligent scanning and navigation method for ground penetrating radar based on deep learning |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Jeannin et al. | Multiconfiguration GPR measurements for geometric fracture characterization in limestone cliffs (Alps) | |
| US7565245B2 (en) | Electromagnetic surveying | |
| CN109521479A (en) | A kind of Indirect testing method of diaphram wall percolating water | |
| CN102866417A (en) | Device and method for seismic cross hole computed tomography (CT) detection and tomography of underground cave | |
| CN104614774B (en) | A kind of transient electromagnetic detecting methods, devices and systems | |
| CN105116453A (en) | Transient electromagnetic exploration method and apparatus for tundra natural gas hydrate | |
| CN113703058A (en) | Method for detecting underground obstacle by utilizing apparent conductivity and relative dielectric constant | |
| Elkarmoty et al. | In-situ GPR test for three-dimensional mapping of the dielectric constant in a rock mass | |
| Malehmir et al. | Post-glacial reactivation of the Bollnäs fault, central Sweden–a multidisciplinary geophysical investigation | |
| Molron et al. | Which fractures are imaged with Ground Penetrating Radar? Results from an experiment in the Äspö Hardrock Laboratory, Sweden | |
| CN113419294A (en) | Comprehensive detection method for multi-dimensional karst special geology | |
| CN112882125A (en) | Tunnel-landslide mass comprehensive detection and stability analysis method | |
| CN103336315A (en) | Method adopting transient electromagnetic method and seismic imaging method to detect gold prospecting holes | |
| Geng et al. | Identifying void defects behind Tunnel composite lining based on transient electromagnetic radar method | |
| Su et al. | Progressive fine integrated geophysical method for karst detection during subway construction | |
| CN113050085A (en) | Advanced geological prediction method | |
| Elawadi et al. | Integrated geophysical survey for site investigation at a new dwelling area, Egypt | |
| CN113281812A (en) | Transient electromagnetic detection method for small pit goaf | |
| Bachiri et al. | GPR application in Civil Engineering to search and detect underground Networks | |
| CN103176216A (en) | Pipeline detection method and borehole antenna | |
| AU2020101106A4 (en) | A controlled-source audio-frequency magnetotellurics method for prospecting deeply buried resources | |
| CN205134393U (en) | A drilling arrangement structure for detecting underground continuous wall seepage | |
| Wilchek | Ground penetrating radar for detection of rock structure | |
| Fu et al. | In situ measurement of water accumulation in overlying goaf of coal mine-a transient electromagnetic-based study | |
| Lei et al. | Application of high-power ground-penetrating radar antennas with different frequencies to quickly locate the upper breakpoint of active buried faults in an urban area in the Datong basin (northern China) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |