CN106772621B - 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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Abstract
The invention discloses a kind of nearly comprehensive resistivity geological extra-forecast methods, by selecting several surveys line being parallel to each other in tunnel, the fixed electrodes of A of each survey line is as point source, and the point source A of three surveys line is required to be close to face, and the pole B is then placed on opposite infinite point；Successively every survey line is measured, acquires the potential difference measurement between the measuring electrode of multiple measuring points；According to each apparent resistivity value of the potential calculation of measurement, and corresponding point position is marked, obtain apparent resistivity-pole span curve relation figure, there is the measuring point corresponding position of significant change to carry out depth measurement inverting apparent resistivity value, obtain true resistivity-depth map；Depth is determined in true resistivity-depth map, using the point source of each survey line as the center of circle, using depth as radius, is drawn equal deep circle, is determined as the exact position of unfavorable geologic body at the equal deep round common intersection point of each survey line.The advantages that execute-in-place of the present invention is simple, high-efficient, and 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 geologicals
Forecasting procedure.
Background technique
With the development of society, Tunnel Engineering is more and more, the construction safety in tunnel is increasingly valued by people.Tunnel
Road advance geologic prediction during constructing tunnel be it is essential, it can help construction personnel to understand constructing tunnel direction
Geological condition guarantees the safety and efficiency of constructing tunnel to determine form of construction work.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 only forecasts one narrow space of front of tunnel heading in most cases,
But in the tunneling process in tunnel, other than 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 a certain range, this is also that a hidden danger is in such a position certainly to the safety in tunnel certainly
The hidden danger set may also equally will lead to corresponding disaster and occur, even if there is no also jeopardizing in tunnelling process
To the later period operation security in tunnel.But if the unfavorable geologic body in face direction up and down can be detected in advance, in tunnel
Process of construction in can take appropriate measures and handled, utmostly prevent unnecessary geological disaster accident hair
It is raw.
Summary of the invention
The present invention to solve the above-mentioned problems, proposes 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, it can be achieved that in face different direction country rock
The positioning and identification of unfavorable geologic body, increase Tunnel prediction range, obtain more abundant geological information, while big
Advanced prediction or detection efficient are improved greatly.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of nearly comprehensive resistivity geological extra-forecast method, comprising the following steps:
(1) select several surveys line being parallel to each other in tunnel, the fixed electrodes of A of each survey line as point source,
The point source A of three surveys line is required to be close to face, and the pole B is then placed on opposite infinite point；
(2) successively every survey line is measured, acquires the potential difference measurement between the measuring electrode of multiple measuring points；
(3) according to each apparent resistivity value of the potential calculation of measurement, and corresponding point position is marked, depending on
Resistivity-pole span curve relation figure has the measuring point corresponding position of significant change to carry out depth measurement inverting apparent resistivity value, obtains true
Resistivity-depth figure；
(4) depth is determined in true resistivity-depth map, using the point source of each survey line as the center of circle, using depth as radius, is drawn
Equal deep circle out, each survey line wait the exact position for being determined as unfavorable geologic body at deep circle common intersection point.
In the step (1), survey line is at least two.
In the step (1), it is respectively the first survey line, the second survey line and third survey line that three surveys line, which are arranged, towards tunnel
The direction of road face is positive direction, and the first survey line is on the left of the bottom plate in tunnel, dome top of second survey line in tunnel, third
Survey line is on the right side of the bottom plate in tunnel.
Preferably, the second survey line is alternatively placed among the bottom plate in tunnel.
In the step (2), under the premise of keeping measuring electrode M, N spacing constant, electrode M, N are according to far from point source A
Direction, while mobile same distance, every movement is primary, primary to the potential difference measurement between M, N, is labeled as a measuring point.
In the step (2), the apparent resistivity value for measuring corresponding measuring point every time is calculated:
Wherein, the potential difference of Δ U measuring electrode M, N, I are 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 indicating record point O to point source A；MN is measuring electrode
The distance between M and measuring electrode N.
In the step (3), according to obtained each apparent resistivity value and corresponding point position, depending on
Resistivity-pole span OA curve relation figure, wherein O is the midpoint of measuring electrode M, N, if the apparent resistivity value of certain point has obvious change
To change, then measuring point corresponding position may have unfavorable geologic body, and depth measurement inverting is carried out to the point, obtains true resistivity-depth map, and
It is half with unfavorable geologic body depth using point source as the center of circle according to the depth for obtaining unfavorable geologic body in true resistivity-depth map
Diameter, the deep circle such as draws, and unfavorable geologic body is just herein at round certain point.
In the step (4), to every survey line apparent resistivity-polar distance map processed, and true resistivity-is obtained by depth measurement inverting
Depth map, using unfavorable geologic body depth as radius, the deep circle such as draws using point source as the center of circle.
In the step (4), if the measuring point for thering is multiple groups resistivity value to have significant change, it is expressed as multiple groups unfavorable geologic body
Presence, using multiple unfavorable geologic body depth as radius, draw corresponding multiple equal deep circles using point source as the center of circle, it is different
Unfavorable geologic body just in the equal deeply round point of intersection of each survey line.
The invention has the benefit that
Effectively unfavorable geologic body (such as solution cavity, crushed zone etc.) more can accurately be identified and positioned, be reduced
Tunnel geological forecast error rate.This method can not only do the advance geologic prediction of front of tunnel heading, also predictable tunnel two
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 range big, and execute-in-place is simple, high-efficient, and effect is good etc.
Advantage.
Detailed description of the invention
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 is the schematic diagram for being accurately positioned unfavorable geologic body in one embodiment of the invention in tunnel by three equal deep circles.
Fig. 4 is apparent resistivity-point position schematic diagram that survey line obtains 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 is to be accurately positioned multiple unfavorable geologic bodies by equal deep circle in complicated geological tunnel in one embodiment of the invention
Schematic diagram.
Wherein: 1, 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 point.
Specific embodiment:
The invention will be further described with embodiment with reference to the accompanying drawing.
Embodiment 1:
(1) three surveys line being parallel to each other, survey line 1 (1), survey line 2 (2), survey line 3 (3), towards tunnel are selected in tunnel
The direction of road face (7) is positive direction, and survey line 1 (1) is on the left of the bottom 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) is on the right side of the bottom plate in tunnel, the fixed power supply electricity of each survey line
Pole A is as point source (4), and the point source A (4) of three surveys line is required to be close to face (7), and the pole B is 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 far from point source A (4), (far from face (7) direction) while mobile same distance (also referred to as point
Away from), every movement is primary, primary to the potential difference measurement between M (5), N (6).Due to supply current it is known that according to formula (1.1)
The apparent resistivity value for measuring corresponding measuring point every time can be calculated:
Wherein, the potential difference of Δ U measuring electrode M (5), N (6), I are supply current, and K is electrode coefficient:
O (12) is measuring point, positioned at the midpoint of electrode M, N.
(3) according to obtained each apparent resistivity value and corresponding point position, apparent resistivity-pole span is obtained
OA curve relation figure, wherein O (12) is the midpoint of measuring electrode M (5), 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.), carry out depth measurement inverting to the point, obtain true resistance
Rate-depth map, and according to the depth for obtaining unfavorable geologic body in true resistivity-depth map, with point source A1It (4) is the center of circle, with
Unfavorable geologic body depth is radius, draws 1 (8) of equal deep circle, and unfavorable geologic body is just herein at round certain point.
(4) it is measured by survey line 2 (2), according to the method for survey line 1 (1), repeats step (2)-step (3), draw view
Resistivity-pole span OA figure, and true resistivity-depth map is obtained by depth measurement inverting, with point source A2It (4) is the center of circle, with poorly
Plastid depth is radius, draws 2 (9) of equal deep circle, unfavorable geologic body (11) is just in the intersection point for wait 1 (8) of deep circle and equal deeply round 2 (9)
Place.
(5) it is measured by survey line 3 (3), according to the method for survey line 1, is repeated step (2)-step (3), apparent resistivity-pole processed
Scheme away from OA, and true resistivity-depth map is obtained by depth measurement inverting, with point source A3It (4) is the center of circle, it is deep with unfavorable geologic body (11)
Degree is radius, draws 3 (10) of equal deep circle, then these deeply 1 (8) of circle, etc. 2 (9) of deep circle with etc. the common intersection point of deeply round 3 (10) be
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 more complicated tunnel of geological condition
(2), survey line 3 (3), using the direction towards tunnel tunnel face (7) as positive direction, survey line 1 (1) is on the left of the bottom plate in tunnel, survey line 2
(2) tunnel dome top (can also in the soleplate between, but be preferably placed in vault), bottom plate of the survey line 3 (3) in tunnel is right
Side, as point source (4), the point source A (4) of three surveys line is required to be close to face the fixed electrodes of A of each survey line
(7), the pole B is then placed on opposite 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 far from point source A (4), (far from face (7) direction) while mobile same distance (also referred to as point
Away from), every movement is primary, primary to the potential difference measurement between M (5), N (6).Due to supply current it is known that according to formula (1.1)
The apparent resistivity value for measuring corresponding measuring point every time can be calculated:
Wherein, the potential difference of Δ U measuring electrode M (5), N (6), I are 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 obtained every bit, apparent resistivity-pole is obtained
Scheme away from OA, wherein O point (12) is the midpoint of measuring electrode M (5), 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.), carry out depth measurement inverting to the point, obtain true resistivity-depth
Degree figure, and according to the depth for obtaining unfavorable geologic body (11) in true resistivity-depth map, it is possible to find multiple groups unfavorable geologic body (11)
Presence, with point source A1(4) it is the center of circle, using multiple unfavorable geologic bodies (11) depth as radius, draws multiple equal 1 (8) of deep circle,
Different unfavorable geologic bodies (11) is just at the certain point of this multiple equal deep circle (8).
(4) it is measured by survey line 2 (2), according to the method for survey line 1 (1), repeats step (2)-step (3), draw view
Resistivity-pole span OA figure, and true resistivity-depth map is obtained by depth measurement inverting, it is possible to find multiple groups unfavorable geologic body (11) are deposited
With point source A2(4) it is the center of circle, using multiple unfavorable geologic bodies (11) depth as radius, draws corresponding multiple equal deep circles 2
(9), different unfavorable geologic body (11) is just waiting 1 (1) of deep circle and is waiting the point of intersection of 2 (9) of deep circle.
(5) it is measured by survey line 3 (3), according to the method for survey line 1 (1), is repeated step (2)-step (3), apparent resistance processed
Rate-pole span OA figure, and true resistivity-depth map is obtained by depth measurement inverting, it is possible to find the presence of multiple groups unfavorable geologic body (11), with
Point source A3(4) it is the center of circle, using multiple unfavorable geologic bodies (11) depth as radius, draws 3 (10) of corresponding multiple equal deep circles,
Then 1 (8) of multiple equal deep circles, etc. the common intersection point of 2 (9) of deep circle and equal deep round 3 (10) be this multiple unfavorable geologic body (11)
Exact position.
By embodiment experimental result it is found that this method is truly feasible, unfavorable geologic body in front of tunnel can be accurately paid in advance
Position.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (5)
1. a kind of nearly comprehensive resistivity geological extra-forecast method, it is characterized in that: the following steps are included:
(1) several surveys line being parallel to each other are selected in tunnel, the fixed electrodes of A of each survey line is as point source, and three
The point source A of survey line is required to be close to face, and the pole B is then placed on opposite infinite point；It is respectively first that three surveys line, which are arranged,
Survey line, the second survey line and third survey line, using the direction towards tunnel tunnel face as positive direction, bottom plate of first survey line in tunnel is left
Side, the second survey line is in the dome top in tunnel, and third survey line is on the right side of the bottom plate in tunnel；Second survey line is alternatively placed in tunnel
Among the bottom plate in road；
(2) successively every survey line is measured, acquires the potential difference measurement between the measuring electrode of multiple measuring points, keeping surveying
Under the premise of amount electrode M, N spacing is constant, electrode M, N move same distance, every movement according to the direction far from point source A
Once, primary to the potential difference measurement between M, N, it is labeled as a measuring point；
(3) according to each apparent resistivity value of the potential calculation of measurement, and corresponding point position is marked, obtains apparent resistance
Rate-pole span curve relation figure has the measuring point corresponding position of significant change to carry out depth measurement inverting apparent resistivity value, obtains true resistance
Rate-depth map；
In the step (3), according to obtained each apparent resistivity value and corresponding point position, apparent resistance is obtained
Rate-pole span OA curve relation figure, wherein O is the midpoint of measuring electrode M, N, if the apparent resistivity value of certain point has significant change,
Measuring point corresponding position may have unfavorable geologic body, carry out depth measurement inverting to the point, obtain true resistivity-depth map, and according to
The depth that unfavorable geologic body is obtained in true resistivity-depth map, using point source as the center of circle, using unfavorable geologic body depth as radius,
The deep circle such as draw, unfavorable geologic body is just herein at round certain point；
(4) determine that depth, using depth as radius, is drawn using the point source of each survey line as the center of circle in true resistivity-depth map
Deep circle, each survey line wait the exact position for being determined as unfavorable geologic body at deep circle common intersection point；
In the step (4), if the measuring point for thering is multiple groups resistivity value to have significant change, it is expressed as depositing for multiple groups unfavorable geologic body
, using point source as the center of circle, using multiple unfavorable geologic body depth as radius, draw corresponding multiple equal deep circles, it is different not
Good geologic body is just in the equal deeply round point of intersection of each survey line.
2. a kind of nearly comprehensive resistivity geological extra-forecast method as described 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 described 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 described in claim 1, it is characterized in that: the step
Suddenly in (2), the apparent resistivity value for measuring corresponding measuring point every time is calculated:
Wherein, the potential difference of Δ U measuring electrode M, N, I are 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 indicating record point O to point source A；MN be measuring electrode M and
The distance between measuring electrode N.
5. a kind of nearly comprehensive resistivity geological extra-forecast method as described 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, using unfavorable geologic body depth as radius, the deep circle such as draws.
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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 |
| 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 |
| 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 |
| CN112415602B (en) * | 2020-10-15 | 2021-11-19 | 山东大学 | Tunnel resistivity advanced detection optimization method and system based on depth resolution |
| CN113031082B (en) * | 2021-03-18 | 2022-11-22 | 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 |
| 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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