CN106772621A - A kind of nearly comprehensive resistivity geological extra-forecast method - Google Patents
A kind of nearly comprehensive resistivity geological extra-forecast method Download PDFInfo
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- CN106772621A CN106772621A CN201710054017.9A CN201710054017A CN106772621A CN 106772621 A CN106772621 A CN 106772621A CN 201710054017 A CN201710054017 A CN 201710054017A CN 106772621 A CN106772621 A CN 106772621A
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- 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
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- 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
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Abstract
The invention discloses a kind of nearly comprehensive resistivity geological extra-forecast method, by selecting some surveys line being parallel to each other in tunnel, each survey line fixes electrodes of A as point source, and the point source A of three surveys line is required to be close to face, and B poles are then placed on relative infinite point；Every survey line is measured successively, the potential difference measurement between the measuring electrode of the multiple measuring points of collection；According to potential calculation each apparent resistivity value of measurement, and corresponding point position is marked, obtain apparent resistivity pole span curve relation figure, the measuring point correspondence position for having significant change to apparent resistivity value carries out depth measurement inverting, obtains true resistivity depth map；Determine depth in true resistivity depth map, the point source with each survey line, with depth as radius, the deep circle such as draws as the center of circle, each survey line waits the exact position for being defined as unfavorable geologic body at deep circle common intersection point.Execute-in-place of the present invention is simple, efficiency high, the advantages of effect is good.
Description
Technical field
The present invention relates to tunnel geological forecast field, more particularly to a kind of nearly comprehensive resistivity tunnel geological
Forecasting procedure.
Background technology
As the development of society, Tunnel Engineering are more and more, the construction safety in tunnel is increasingly valued by people.Tunnel
Road advance geologic prediction is essential during constructing tunnel, and it can help workmen to understand constructing tunnel direction
Geological condition, so as to determine form of construction work, it is ensured that the security and efficiency of constructing tunnel.But during constructing tunnel, sometimes
Although time has carried out corresponding advanced prediction, due to the complexity of front of tunnel heading geological condition, disaster thing still can occur
Therefore, such as gushing water, prominent mud and landslide etc..Therefore, Tunnel prediction method also needs to carry out further further investigation.
Current Tunnel prediction method simply forecasts one narrow space of front of tunnel heading in most cases,
But in the tunneling process in tunnel, in addition to the unfavorable geology of front of tunnel heading can have an impact to driving, face is up and down
If there is unfavorable geology in certain limit, this safety to tunnel is also a hidden danger certainly, certainly, is in such a position
The hidden danger put equally is likely to cause corresponding disaster to occur, even if not occurring in tunnelling process, also entail dangers to
To the later stage operation security in tunnel.But if the unfavorable geologic body in face direction up and down can in advance be detected, in tunnel
Process of construction in can just take appropriate measures and processed, at utmost prevent unnecessary geological disaster accident hair
It is raw.
The content of the invention
The present invention is in order to solve the above problems, it is proposed that a kind of nearly comprehensive resistivity geological extra-forecast method,
The present invention once supplements existing tunnel method for forecasting advanced geology and improves and improve, and is capable of achieving in face different azimuth country rock
The positioning of unfavorable geologic body and identification, increased Tunnel prediction scope, obtain the geological information of more horn of plenty, while greatly
Improve advanced prediction or detection efficient greatly.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of nearly comprehensive resistivity geological extra-forecast method, comprises the following steps：
(1) some surveys line being parallel to each other are selected in tunnel, each survey line fixes electrodes of A as point source,
The point source A of three surveys line is required to be close to face, and B poles are then placed on relative infinite point；
(2) every survey line is measured successively, the potential difference measurement between the measuring electrode of the multiple measuring points of collection；
(3) according to potential calculation each apparent resistivity value of measurement, and corresponding point position is marked, depending on
Resistivity-pole span curve relation figure, the measuring point correspondence position for having significant change to apparent resistivity value carries out depth measurement inverting, obtains true
Resistivity-depth figure；
(4) depth is determined in true resistivity-depth map, the point source with each survey line, with depth as radius, is drawn as the center of circle
The deep circle such as go out, each survey line waits the exact position for being defined as unfavorable geologic body at deep circle common intersection point.
In the step (1), survey line is at least two.
In the step (1), three bars of surveys line are set and are respectively the first survey line, the second survey line and the 3rd survey line, with towards tunnel
The direction of road face be positive direction, the first survey line on the left of the base plate in tunnel, the second survey line tunnel dome top, the 3rd
Survey line is on the right side of the base plate in tunnel.
Preferably, the second survey line is alternatively positioned in the middle of the base plate in tunnel.
In the step (2), under the premise of keeping measuring electrode M, N spacing constant, electrode M, N are according to away from point source A
Direction, while mobile same distance, it is often mobile once, labeled as a measuring point to the potential difference measurement between M, N once.
In the step (2), the apparent resistivity value of measurement correspondence measuring point every time is calculated：
Wherein, the potential difference of Δ U measuring electrodes M, N, I is supply current, and K is electrode coefficient:
O is measuring point, and positioned at the midpoint of electrode M, N, OA is the distance for representing measuring point O to point source A；MN is measuring electrode
The distance between M and measuring electrode N.
In the step (3), according to each apparent resistivity value and corresponding point position for obtaining, depending on
Resistivity-pole span OA curve relation figures, wherein O is the midpoint of measuring electrode M, N, if the apparent resistivity value of certain point has substantially change
Change, then measuring point corresponding position there may be unfavorable geologic body, and depth measurement inverting is carried out to the point, obtain true resistivity-depth map, and
It is half with unfavorable geologic body depth with point source as the center of circle according to the depth that unfavorable geologic body is drawn in true resistivity-depth map
Footpath, the deep circle such as draws, at the just round herein certain point of unfavorable geologic body.
In the step (4), to every survey line apparent resistivity-polar distance map processed, and by depth measurement inverting obtain true resistivity-
Depth map, with point source as the center of circle, with unfavorable geologic body depth as radius, the deep circle such as draws.
In the step (4), if there is multigroup resistivity value to have the measuring point of significant change, multigroup unfavorable geologic body has been expressed as
Presence, with point source as the center of circle, with multiple unfavorable geologic body depth as radius, draw the circle deeply such as corresponding multiple, it is different
Unfavorable geologic body just in the point of intersection for waiting deep circle of each survey line.
Beneficial effects of the present invention are：
More accurate identification can be effectively carried out to unfavorable geologic body (such as solution cavity, crushed zone etc.) and is positioned, reduced
Tunnel geological forecast error rate.The method can not only do the advance geologic prediction of front of tunnel heading, and tunnel two also can be predicted
Side and upper and lower geologic body situation, it is ensured that the directive country rock of institute is all in safe condition during constructing tunnel；Generally,
Nearly comprehensive resistivity geological extra-forecast method has forecast scope is big, and execute-in-place is simple, efficiency high, and effect is good etc.
Advantage.
Brief description of the drawings
Fig. 1 is the flow chart of nearly comprehensive resistivity geological extra-forecast method in one embodiment of the invention.
Fig. 2 is nearly comprehensive resistivity geological extra-forecast method survey line in tunnel in one embodiment of the invention
The front schematic view of arrangement.
Fig. 3 be in one embodiment of the invention in tunnel by three schematic diagrames for waiting deep circle to be accurately positioned unfavorable geologic body.
Fig. 4 is apparent resistivity-point position schematic diagram that survey line is obtained in one embodiment of the invention.
Fig. 5 is true resistivity-depth schematic diagram that survey line is obtained through depth measurement inverting in one embodiment of the invention.
Fig. 6 be in one embodiment of the invention in complicated geological tunnel by waiting deep circle to be accurately positioned multiple unfavorable geologic bodies
Schematic diagram.
Wherein：1st, survey line 1,2, survey line 2,3, survey line 3,4, point source A, 5, measuring electrode M, 6, measuring electrode N, 7, area
Face, 8, etc. deep circle 1,9, etc. deep circle 2,10, etc. deep circle 3,11, unfavorable geologic body, 12, O points.
Specific embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Embodiment 1：
(1) three surveys line being parallel to each other, survey line 1 (1), survey line 2 (2), survey line 3 (3), with towards tunnel are selected in tunnel
The direction of road face (7) be positive direction, survey line 1 (1) on the left of the base plate in tunnel, dome top of the survey line 2 (2) in tunnel
(can also in the soleplate between, but be preferably placed in vault), survey line 3 (3) on the right side of the base plate in tunnel, the fixed power supply electricity of each survey line
Pole A is required to be close to face (7) as point source (4), the point source A (4) of three surveys line, and B poles are then placed on relatively infinite
At a distance.
(2) survey line 1 (1) is measured first, under the premise of keeping measuring electrode M (5), N (6) spacing constant, electrode M
(5), N (6) is according to the direction away from point source A (4), (away from face (7) direction) (also referred to as point while mobile same distance
Away from), often move once, to the potential difference measurement between M (5), N (6) once.Due to supply current, it is known that according to formula (1.1)
Just the apparent resistivity value of measurement correspondence measuring point every time can be calculated：
Wherein, Δ U measuring electrodes M (5), the potential difference of N (6), I is supply current, and K is electrode coefficient:
O (12) is measuring point, positioned at the midpoint of electrode M, N.
(3) according to each apparent resistivity value and corresponding point position for obtaining, apparent resistivity-pole span is obtained
OA curve relation figures, wherein O (12) they are measuring electrode M (5), the midpoint of N (6), if the apparent resistivity value of certain point has significant change,
Then measuring point corresponding position may have unfavorable geologic body (11) (water-bearing layer etc.), and depth measurement inverting is carried out to the point, obtain true resistance
Rate-depth map, and according to the depth of unfavorable geologic body is drawn in true resistivity-depth map, with point source A1(4) it is the center of circle, with
Unfavorable geologic body depth is radius, draws and waits deep circle 1 (8), at the just round herein certain point of unfavorable geologic body.
(4) measured by survey line 2 (2), according to the method for survey line 1 (1), repeat step (2)-step (3), drafting is regarded
Resistivity-pole span OA figures, and true resistivity-depth map is obtained by depth measurement inverting, with point source A2(4) it is the center of circle, with poorly
Plastid depth is radius, draws and waits deep circle 2 (9), and unfavorable geologic body (11) is just waiting deep circle 1 (8) and the intersection point for waiting deeply round 2 (9)
Place.
(5) measured by survey line 3 (3), according to the method for survey line 1, repeat step (2)-step (3), apparent resistivity-pole processed
Away from OA figures, and true resistivity-depth map is obtained by depth measurement inverting, with point source A3(4) it is the center of circle, it is deep with unfavorable geologic body (11)
It is radius to spend, and the deep circle 3 (10) such as draws, then these deeply circle 1 (8), etc. deep circle 2 (9) be with the common intersection point for waiting deeply round 3 (10)
The exact position of unfavorable geologic body (11).
Embodiment 2：
(1) three surveys line being parallel to each other, survey line 1 (1), survey line 2 are selected in the complex tunnel of geological condition
(2), survey line 3 (3), are positive direction with the direction towards tunnel tunnel face (7), survey line 1 (1) on the left of the base plate in tunnel, survey line 2
(2) tunnel dome top (can also in the soleplate between, but be preferably placed in vault), base plate of the survey line 3 (3) in tunnel is right
Side, each survey line fixes electrodes of A as point source (4), and the point source A (4) of three surveys line is required to be close to face
(7), B poles are then placed on relative infinite point.
(2) survey line 1 (1) is measured first, under the premise of keeping measuring electrode M (5), N (6) spacing constant, electrode M
(5), N (6) is according to the direction away from point source A (4), (away from face (7) direction) (also referred to as point while mobile same distance
Away from), often move once, to the potential difference measurement between M (5), N (6) once.Due to supply current, it is known that according to formula (1.1)
Just the apparent resistivity value of measurement correspondence measuring point every time can be calculated：
Wherein, Δ U measuring electrodes M (5), the potential difference of N (6), I is supply current, and K is electrode coefficient:
O (12) is measuring point, positioned at the midpoint of electrode M, N.
(3) according to the apparent resistivity value and corresponding point position of the every bit for obtaining, apparent resistivity-pole is drawn
Away from OA figures, wherein O points (12) is measuring electrode M (5), the midpoint of N (6), if the apparent resistivity value of certain point has significant change, is surveyed
Point corresponding position may have unfavorable geologic body (11) (water-bearing layer etc.), and depth measurement inverting is carried out to the point, obtain true resistivity-depth
Degree figure, and according to drawing the depth of unfavorable geologic body (11) in true resistivity-depth map, it is possible to find multigroup unfavorable geologic body (11)
Presence, with point source A1(4) it is the center of circle, with multiple unfavorable geologic bodies (11) depth as radius, draws the circle 1 (8) deeply such as multiple,
Different unfavorable geologic bodies (11) is just at this multiple etc. the deeply certain point of circle (8).
(4) measured by survey line 2 (2), according to the method for survey line 1 (1), repeat step (2)-step (3), drafting is regarded
Resistivity-pole span OA figure, and true resistivity-depth map is obtained by depth measurement inverting, it is possible to find multigroup unfavorable geologic body (11) deposit
With point source A2(4) it is the center of circle, with multiple unfavorable geologic bodies (11) depth as radius, draws the circle 2 deeply such as corresponding multiple
(9), different unfavorable geologic body (11) is just in the point of intersection for waiting deep circle 1 (1) with wait deep circle 2 (9).
(5) measured by survey line 3 (3), according to the method for survey line 1 (1), repeat step (2)-step (3), apparent resistance processed
Rate-pole span OA figures, and true resistivity-depth map is obtained by depth measurement inverting, it is possible to find the presence of multigroup unfavorable geologic body (11), with
Point source A3(4) it is the center of circle, with multiple unfavorable geologic bodies (11) depth as radius, draws the circle 3 (10) deeply such as corresponding multiple,
Then multiple etc. deeply circle 1 (8), etc. deep circle 2 (9) with to wait deep round 3 (10) common intersection point be this multiple unfavorable geologic body (11)
Exact position.
From embodiment experimental result, this method is truly feasible, can accurately pay tunnel front unfavorable geologic body in advance
Position.
Although above-mentioned be described with reference to accompanying drawing to specific embodiment of the invention, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (10)
1. a kind of nearly comprehensive resistivity geological extra-forecast method, it is characterized in that：Comprise the following steps：
(1) some surveys line being parallel to each other are selected in tunnel, each survey line fixes electrodes of A as point source, three
The point source A of survey line is required to be close to face, and B poles are then placed on relative infinite point；
(2) every survey line is measured successively, the potential difference measurement between the measuring electrode of the multiple measuring points of collection；
(3) according to potential calculation each apparent resistivity value of measurement, and corresponding point position is marked, obtains apparent resistance
Rate-pole span curve relation figure, the measuring point correspondence position for having significant change to apparent resistivity value carries out depth measurement inverting, obtains true resistance
Rate-depth map；
(4) depth is determined in true resistivity-depth map, the point source with each survey line, with depth as radius, draws as the center of circle
Deep circle, each survey line waits the exact position for being defined as unfavorable geologic body at deep circle common intersection point.
2. a kind of nearly comprehensive resistivity geological extra-forecast method as claimed in claim 1, it is characterized in that：The step
Suddenly in (1), survey line is at least two.
3. a kind of nearly comprehensive resistivity geological extra-forecast method as claimed in claim 1, it is characterized in that：The step
Suddenly in (1), survey line is three.
4. a kind of nearly comprehensive resistivity geological extra-forecast method as claimed in claim 1, it is characterized in that：The step
Suddenly in (1), three bars of surveys line are set and are respectively the first survey line, the second survey line and the 3rd survey line, with towards the direction of tunnel tunnel face
Be positive direction, the first survey line on the left of the base plate in tunnel, the second survey line tunnel dome top, bottom of the 3rd survey line in tunnel
Plate right side.
5. a kind of nearly comprehensive resistivity geological extra-forecast method as claimed in claim 4, it is characterized in that：Second surveys
Line is alternatively positioned in the middle of the base plate in tunnel.
6. a kind of nearly comprehensive resistivity geological extra-forecast method as claimed in claim 1, it is characterized in that：The step
Suddenly in (2), under the premise of keeping measuring electrode M, N spacing constant, electrode M, N are according to the direction away from point source A, while moving
Same distance, often moves once, labeled as a measuring point to the potential difference measurement between M, N once.
7. a kind of nearly comprehensive resistivity geological extra-forecast method as claimed in claim 1, it is characterized in that：The step
Suddenly in (2), the apparent resistivity value of measurement correspondence measuring point every time is calculated：
Wherein, the potential difference of Δ U measuring electrodes M, N, I is supply current, and K is electrode coefficient:
O is measuring point, and positioned at the midpoint of electrode M, N, OA is the distance for representing measuring point O to point source A；MN be measuring electrode M and
The distance between measuring electrode N.
8. a kind of nearly comprehensive resistivity geological extra-forecast method as claimed in claim 1, it is characterized in that：The step
Suddenly in (3), according to each apparent resistivity value and corresponding point position for obtaining, apparent resistivity-pole span OA is obtained
Curve relation figure, wherein O are the midpoint of measuring electrode M, N, if the apparent resistivity value of certain point has significant change, measuring point correspondence position
The place of putting may have unfavorable geologic body, and depth measurement inverting is carried out to the point, obtain true resistivity-depth map, and according to true resistivity-depth
The depth of unfavorable geologic body is drawn in degree figure, with point source as the center of circle, with unfavorable geologic body depth as radius, the deep circle such as draws,
At the just round herein certain point of unfavorable geologic body.
9. a kind of nearly comprehensive resistivity geological extra-forecast method as claimed in claim 1, it is characterized in that：The step
Suddenly in (4), to every survey line apparent resistivity-polar distance map processed, and true resistivity-depth map is obtained by depth measurement inverting, with an electricity
Source is the center of circle, with unfavorable geologic body depth as radius, the deep circle such as draws.
10. a kind of nearly comprehensive resistivity geological extra-forecast method as claimed in claim 1, it is characterized in that the step
Suddenly in (4), if there is multigroup resistivity value to have the measuring point of significant change, the presence of multigroup unfavorable geologic body is expressed as, with an electricity
Source is the center of circle, with multiple unfavorable geologic body depth as radius, draws the circle deeply such as corresponding multiple, and different unfavorable geologic bodies are just
In the point of intersection for waiting deep circle of each survey line.
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| CN109828239A (en) * | 2019-02-26 | 2019-05-31 | 广州市沙唯士电子科技有限公司 | A kind of radar instrument for mine shaft geology with safeguard function for mineral exploration |
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| CN108828678B (en) * | 2018-08-25 | 2020-05-29 | 安徽省公路工程检测中心 | Advanced geological detection system for tunnel construction |
| CN108828678A (en) * | 2018-08-25 | 2018-11-16 | 林光琴 | A kind of advanced geology for tunnel construction detection system |
| CN108957563A (en) * | 2018-09-08 | 2018-12-07 | 林光琴 | A kind of advanced geology for tunnel construction detection system and detection method |
| CN108957563B (en) * | 2018-09-08 | 2020-10-23 | 聊城国奥信息技术有限公司 | Advanced geological detection system and detection method for tunnel construction |
| CN109461359A (en) * | 2018-11-16 | 2019-03-12 | 高军 | A kind of aqueous geological structure forward probe method in tunnel |
| CN109828239A (en) * | 2019-02-26 | 2019-05-31 | 广州市沙唯士电子科技有限公司 | A kind of radar instrument for mine shaft geology with safeguard function for mineral exploration |
| CN109828239B (en) * | 2019-02-26 | 2021-08-24 | 广西兴霖矿业投资咨询有限公司 | Mine geological radar instrument with protection function for mineral exploration |
| CN111208572A (en) * | 2020-02-28 | 2020-05-29 | 重庆慧勘工业技术研究院有限公司 | Multi-section dynamic imaging method and device based on mining transient electromagnetic instrument |
| CN112415602A (en) * | 2020-10-15 | 2021-02-26 | 山东大学 | Tunnel resistivity advanced detection optimization method and system based on depth resolution |
| CN112415602B (en) * | 2020-10-15 | 2021-11-19 | 山东大学 | Tunnel resistivity advanced detection optimization method and system based on depth resolution |
| WO2022078516A1 (en) * | 2020-10-15 | 2022-04-21 | 山东大学 | Tunnel resistivity advanced detection optimization method and system based on depth resolution |
| CN113031082A (en) * | 2021-03-18 | 2021-06-25 | 中国科学院地理科学与资源研究所 | Induced polarization sounding advanced prediction system and method for shield construction tunnel |
| CN114814964A (en) * | 2022-05-17 | 2022-07-29 | 安徽理工大学 | Roadway front water-rich area distinguishing method based on variable source distance direct current resistivity |
| CN114814964B (en) * | 2022-05-17 | 2024-04-05 | 安徽理工大学 | Roadway front water-rich area discrimination method based on variable source distance direct current resistivity |
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