CN108802828A - Bored grouting curtain quality determining method - Google Patents
Bored grouting curtain quality determining method Download PDFInfo
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- CN108802828A CN108802828A CN201810820293.6A CN201810820293A CN108802828A CN 108802828 A CN108802828 A CN 108802828A CN 201810820293 A CN201810820293 A CN 201810820293A CN 108802828 A CN108802828 A CN 108802828A
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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Abstract
The present invention discloses a kind of bored grouting curtain quality determining method, including：S1,In curtain along the both ends of its trend for laying positive and negative current electrode in electric drilling,The power supply terminal of current electrode and electrical measuring instrument, connects,S2,Setting measures drilling,Adjacent two for a pair of of measuring electrode is arranged in electric drilling,Measuring electrode and the measurement terminal of electrical measuring instrument, connect,S3,Start the electrical measuring instrument,,It is powered to underground by current electrode,Measure potential difference between two measuring electrodes or apparent resistivity value or polarizability value,Geometry midpoint of the record point between two measuring electrodes,S4,Measure potential difference or apparent resistivity value or polarizability value of the measuring electrode on the record point in different depth position,S5,Measuring electrode is replaced to different measurement drilling,Repeat step S4,S6,Draw curtain potential difference isogram or or curtain apparent resistivity isoline figure or curtain polarizability isogram.
Description
Technical field
The invention belongs to Grouting Curtain Engineering antiseepage detection technique fields, and in particular to a kind of bored grouting curtain quality inspection
Survey method.
Background technology
Large hydraulic engineering or mine ancillary works needs build continuous curtain in the country rock of underground, using bored grouting
Mode forms the continuous flow in underground and blocks barrier.But if there are hidden leakage defects will influence curtain for the closure curtain of design and construction
Curtain water blockoff efficiency, heavy losses will be brought when endangering serious to project subject.Therefore hidden danger position and timely processing are effectively detected
It is significant for the curtain engineering of underground.
Resistivity is situated between significantly lower than surrounding ground when in most cases, due to formation or aqueous crack water-bound
Matter.After being blocked using curtain-grouting, if slip casting medium is the dielectric material of high resistivity and hypopolarization rate, intact curtain is blocked
Curtain will form a high resistivity and hypopolarization rate barrier, and there are the position of slip casting defect, the intact portion with country rock and slip casting
Position is compared, and resistivity is relatively low, and polarizability is relatively high.Using the correlation of current field and flow field distribution, electrical method is surveyed
Spy is a kind of convenient, low-cost perils detecting means of construction.
The premise that Detection task is completed in electrical prospecting is to obtain high-resolution electric field observation by effective equipment technology
Data.Underground curtain Hidden Danger Detection is that electric field foundation and measurement are carried out in a half space, is influenced by bulk effect, a side
The resolution capability of face electrical prospecting is limited, another aspect side exception serious interference, so implementing electrical prospecting will obtain well
Effect, the electric field of foundation is uniformly distributed as far as possible, to improve abnormal resolution capability, on the other hand needs to use up measuring electrode
Amount is close to hidden danger target.
Existing curtain detection means includes：(a kind of 200910033689.7 water-stop curtains ooze first, foundation pit waterproof curtain
Leak passage hidden trouble detection method, 201210571740.1 it is a kind of detection high polymer cutoff wall integrality current potential Imaging Method,
A kind of 201210087153.5 electrical measurement method and devices of detection high polymer cutoff wall), it is carried out with current field fitting water flow field
Water stopping curtain seepage detection etc.；Second, passing through (the test sides parallel resistance rate CT between 201110241747.2 wells resistivity CT
Method, 201210269261.4 underground engineering high-resolution three-dimension resistivity CT imaging advanced forecasting systems and method) detection progress
Across hole power supply and electric field measurement and resistivity imaging.The former is to carry out Hidden Danger Detection with electric current field simulation water flow field, is all to hang down
Directly direction is moved towards in curtain establish electric field；The pattern of the observation system that the latter uses, across the hole elastic wave of reference or Electromagnetic CT, one
It powers in a hole, another hole receives；Current electrode is using dipole, monopole (poles B are in infinity), two pole devices or multipole dress
It sets, receiving electrode measures current potential or electric potential gradient.Since observation point and supply terminals distance are close, it is easy by supply terminals surrounding medium
The interference of conductivity anomaly, and be the three-dimensional underground space, the electric conductivity of the difficult true reflection underground medium structure of explanation results again
Distributed intelligence, so " resistivity CT " this method is a kind of new intention, but there are great difficulties for production practices.
Invention content
The main object of the present invention is to provide a kind of bored grouting curtain quality determining method, it is intended to solve existing curtain
The electric field that detection means is tested cannot highlight hidden danger, resolution capability also inadequate problem well.
To achieve the above object, the present invention proposes a kind of bored grouting curtain quality determining method, including：
S1 is drilled at least a pair along the both ends of its trend in curtain and is laid in for electric drilling corresponding for electric drilling
The power supply terminal of at least a pair of positive and negative current electrode, the current electrode and electrical measuring instrument, connects,
S2, is arranged multiple measurements drillings on the connecting line on curtain, between positive and negative current electrode, each to measure between drilling etc.
Away from setting, adjacent two for a pair of of measuring electrode, the measurement of the measuring electrode and electrical measuring instrument, are arranged in electric drilling
Terminal connects,
S3 starts the electrical measuring instrument, is powered to underground by current electrode, measures the electricity between two measuring electrodes
Potential difference value or apparent resistivity value or polarizability value, geometry midpoint of the record point between two measuring electrodes,
S4 makes measuring electrode equidistantly be moved along drilling depth direction is measured, measures measuring electrode in different depth position
When record point on potential difference or apparent resistivity value or polarizability value,
Measuring electrode is replaced to different measurement drilling, repeats step S4 by S5,
S6 draws curtain potential difference isogram or or curtain apparent resistivity isoline figure according to step S4 and step S5
Or curtain polarizability isogram, the abnormal area in figure are the defect area of grouting curtain.
Preferably, in step sl, the current electrode is set to the peripheral position except curtain, and curtain is located at positive and negative confession
The centre position of electrode.
Preferably, the distance between positive and negative described current electrode is at least 3 times of curtain length.
Preferably, in step sl, the current electrode be set to curtain on, between the positive and negative current electrode away from
From the length less than the curtain；Curtain is divided into one section or more of multistage and carries out segmentation detection.
Preferably, the power supply terminal is powered as alternating current or direct current or periodic signal of square wave electricity, or programming control
Frequency variation signal electricity processed.
Preferably, in step sl, the current electrode is point source or line power supply, when the point source is incessantly a pair of
When, point source vertically equidistantly arranges, or is equidistantly arranged along direction is moved towards perpendicular to curtain.
Preferably, in the step S3-S5, the computational methods of the apparent resistivity are：
Measurement potential difference between two measuring electrodes is denoted as Δ U ', and for record point positioned at the geometry midpoint of two electrodes, I is to measure
When current supply circuit electric current, k is electrode coefficient, and expression formula is：
Wherein, ρ is the resistivity of curtain-grouting material, and Ha and Hb are respectively the depth of positive and negative current electrode, and L is positive and negative confession
Electrode spacing between electrode, R1 are one of two measuring electrodes the distance between to positive current electrode, R2 be two measuring electrodes it
Another to arrive the distance between positive current electrode, h1, h2 are the depth of two measuring electrode,
The apparent resistivity of the point is：ρs=k Δs U '/I.
Preferably, the detection method further includes：
S7, it is assumed that have N number of drilling on curtain, each drilling is observed provided with M depth point, obtains (N-1) * M altogether
A record point data；Record point wherein apart from the same depth of earth's surface shares M groups, every group of (N-1) a data；It takes in M group data
One group of data calculate average value G, each measuring point data X is with average value G compared in the group, calculating relative changing value, i.e.,
The new parameter of [(X-G)/G] as the measuring point；In this way by the potential difference of every group of depth point, polarizability or apparent resistivity number
According to being all converted into new parameter；Potential difference or or polarizability or the transformed equivalence of apparent resistivity are drawn using the new parameter on curtain
Line chart corresponds to potential difference relative variation and changes at figure or apparent resistivity are opposite at figure, polarizability relative variation respectively
Measure into figure.
Compared with prior art, the advantageous effect of technical solution of the present invention：
The method of the present invention uses rational electric field arrangement, on the one hand allows electric field that can cover detected curtain and breaks entirely
Face, and the electrode spacing of current electrode is widened as possible, allow curtain to be located at the middle part of electrode connecting line so that electric field is within the scope of curtain
It is uniformly distributed, to highlight abnormal hidden danger that may be present；It is powered using multipair current electrode, the electric field of one line of curtain is further
Homogenization provides good condition for high-accuracy high-resolution detection；On the other hand it borrows inlet well and lays measuring electrode, by
In electrode close to hidden danger target that may be present, the resolution capability of electrical prospecting is also guaranteed.For synthesis, this method uses
Underground continuous current field is established along curtain trend, closely observation electric field is carried out by drilling, by electric field or calculates resistivity
It carries out full curtain section and laterally compares (section isopleth), providing more complete technology for grouting curtain integrity detection protects
Barrier.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the testing principle schematic diagram for the bored grouting curtain quality determining method that the embodiment of the present invention one proposes；
Fig. 2 is the detection circulation figure for the bored grouting curtain quality determining method that Fig. 1 is proposed；
Fig. 3 is to arrange sectional view using multipair vertical point source work on the spot in the embodiment of the present invention two；
Fig. 4 is to arrange vertical view using multipair horizontal point source work on the spot in the embodiment of the present invention three；
Fig. 5 is that four kinds of the embodiment of the present invention arranges sectional view using line power supply work on the spot；
Fig. 6 is the curtain sectional contour line schematic diagram based on potential difference, polarizability, apparent resistivity or resistance parameter.
Specific implementation mode
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.
Embodiment one
Fig. 1, Fig. 2 are please referred to, Fig. 1 is a kind of testing principle of bored grouting curtain quality determining method proposed by the present invention
Schematic diagram, in Fig. 1 it is each marked as：1- electrical prospecting powering apparatus, 2- electrical prospecting measure equipment, 3- inlet wells and volume
Number, 4- measuring electrodes, 5- measuring electrode conducting wires, the ground 6- lower half-space current line, 7- current electrodes, 8- current electrode conducting wires, 9-
Supply current size and direction, the defects of 10- curtains hidden danger.
Fig. 2 is the flow chart that quality in site detection is carried out using the bored grouting curtain quality determining method that Fig. 1 is proposed.
Bored grouting curtain quality determining method proposed by the present invention, including：
1, it is in high resistivity or hypopolarization rate after selecting the materials such as curtain-grouting cement, the materials such as cement to should be solidification
Material, according to the curing period that injecting paste material and grouting process are determined, after needing to wait until curing period or after injecting paste material solidification again
Proceed by curtain quality testing.
2, pairs of positive and negative current electrode is laid along the both ends extended line of its trend in curtain in a row, passes through conducting wire point
It is not connected to the power supply terminal of electrical measuring instrument,；
It is drilled with multiple measurement drillings on connecting line between positive and negative current electrode, is launched respectively in two adjacent drillings
One measuring measuring electrode of earth electric field, measuring electrode are connected to the measurement terminal of electrical measuring instrument,.
3, start electrical measuring instrument, powered to underground by current electrode, by between measuring electrode two electrodes of measurement
Potential difference or polarizability, the record point of potential difference and polarizability value be located at the geometry midpoint of two measuring electrodes；
Also, using computation of apparent resistivity method and corresponding supply current size and current electrode, measuring electrode it is several
What location parameter, calculates apparent resistivity, and apparent resistivity parameter is fallen on record point.
4, change the depth location of measuring electrode in the borehole, measure or calculate the potential difference on different record points or polarization
Rate or apparent resistivity.
5, it replaces and measures drilling, repeat step 3, the measurement in step 4, calculating process so that record point is uniformly distributed in
Grouting curtain.
6, according to the record of step 5 as a result, drawing grouting curtain potential difference isogram, polarizability isogram or regarding electricity
Resistance rate isogram, from the abnormal area of potential difference, polarizability or apparent resistivity on isogram, incorporation engineering geology and
Hydrogeologic data identifies defect size and the geometric position of grouting curtain.
7, in step 3, the Computing Principle and method of the apparent resistivity：
Theoretically, for the horizontal homogeneous half space that resistivity is ρ, if positive and negative current electrode buried depth is respectively Ha and Hb,
Electrode spacing L, supply current size are I；The horizontal distance of one measuring electrode to positive current electrode is R1, depth h1, another survey
The horizontal distance for measuring electrode to positive current electrode is R2, depth h2；The theory in two measuring electrodes is indicated respectively with U1 and U2
Potential value, then the theoretical potential difference between two measuring electrodes be expressed as：
In the detection of practical grouting curtain, the measurement potential difference between two measuring electrodes is denoted as Δ U ', and record point is located at two
The geometry midpoint of electrode, I are current supply circuit electric current when measuring, and k is electrode coefficient, and expression formula is：
The apparent resistivity of the point is expressed as：ρs=k Δs U '/I.
8, other than drafting curtain electric field and apparent resistivity section isogram determine curtain hidden danger extremely, actual measurement curtain electricity
Field distribution data calculate apparent resistivity data, and the inverting of curtain resistivity may be implemented according to electrical prospecting principle, pass through
Inverting resistivity profile isogram determines resistivity anomaly region, and incorporation engineering geology and hydrogeologic data identify slip casting
The defect size of curtain and geometric position.
In addition, detection method can be used for the quality testing of non-vertical bored grouting curtain.
Embodiment two
Fig. 3 is please referred to, the present embodiment two proposes that a kind of bored grouting curtain quality determining method, working site use multipair
Point source is vertically arranged, and Fig. 3 is the vertical cross-sectional of field operation when curtain detects, which includes：
1, respectively extending 200m at along the both ends of its trend in long 200m linear arrays curtain, boring a pair for electric drilling,
3 pairs of positive and negative current electrodes (supply terminals vertical array) are equidistantly laid by upper and lower vertical direction in drilling, current electrode is by leading
Line is respectively connected to the power supply terminal of electrical measuring instrument,；
2, zk1~zk11 totally 11 borehole surveys drillings are drilled on the connecting line between positive and negative current electrode, this 11
An earth electric field measurement measuring electrode is launched respectively in a adjacent two drilling measured in drilling, and measuring electrode is connected to electrical method
The measurement terminal of prospecting instrument；
3, start electrical measuring instrument, powered to underground by current electrode, make measuring electrode along measurement drilling depth side
To even depth and synchronizing moving, the potential difference between two electrodes is measured, wherein the record point of potential difference is located at the several of two electrodes
What midpoint；
4, it replaces measuring electrode to be put into different measurement drillings, repeats the above steps 3, compute repeatedly process so that
Record point is uniformly distributed in grouting curtain；
5, according to the potential difference of different record point position, grouting curtain potential difference isogram is drawn, with reference to Fig. 6,
Incorporation engineering geology and the defect of hydrogeologic data identification grouting curtain are big from the potential difference abnormal area on isogram
Small and geometric position.
Embodiment three
Fig. 4 is please referred to, the present embodiment three proposes that a kind of bored grouting curtain quality determining method, working site use multipair
Point source horizontal direction arranges that Fig. 4 is the vertical view of field operation when curtain detects, which includes：
1, respectively extend at 500m at the both ends that long 500m, slip casting pitch of holes 10m linear array curtains move towards, perpendicular to curtain
Moving towards to lay 3 pairs of positive and negative current electrodes, (line of 3 positive current electrodes or the line and curtain trend of 3 negative current electrodes are vertical
Directly, and 3 pairs of positive and negative current electrodes are in same level), the feeder ear of electrical measuring instrument, is respectively connected to by conducting wire
Son；
2, an earth electric field measurement is launched respectively in adjacent two drilling of 51 drillings such as zk1~zk51 with this to measure
Electrode, measuring electrode are connected to the measurement terminal of electrical measuring instrument,；
3, start electrical measuring instrument, powered to underground by current electrode, pass through measuring electrode even depth and synchronous shifting
It is dynamic, the induced polarization rate parameter between two electrodes is measured, the record point of polarizability is located at the geometry midpoint of two electrodes；
4, drilling duplicate measurements is replaced so that record point is uniformly distributed in grouting curtain；
5, grouting curtain polarizability isogram is drawn, similar Fig. 6 is tied from the polarizability abnormal area on isogram
Close defect size and the geometric position of engineering geology and hydrogeologic data identification grouting curtain.
Example IV
Fig. 5 is please referred to, the present embodiment four proposes that a kind of bored grouting curtain quality determining method, working site arrangement use
Line power supply, Fig. 5 are using line power work site layout project sectional view, which includes：
1, long 2000m, slip casting pitch of holes 10m linear array curtains are divided into 4 sections, per segment length 500m, with reference to embodiment
Two or three, curtain move towards both ends respectively extend at 500m bore it is a pair of for electric drilling (some inlet well can be utilized), in drilling
1 pair of positive and negative current electrode of threadiness is laid vertically, and the power supply terminal of electrical measuring instrument, is respectively connected to by conducting wire；
2, an earth electric field measurement is launched respectively in adjacent two drilling of 51 drillings such as zk1~zk51 with this to measure
Electrode, measuring electrode are connected to the measurement terminal of electrical measuring instrument,；
3, start electrical measuring instrument, powered to underground by current electrode, pass through measuring electrode even depth and synchronous shifting
Dynamic, the potential difference and induced polarization rate, the record point of two parameter value measured between two electrodes is located at the geometry midpoint of two electrodes；
4, drilling duplicate measurements is replaced so that record point is uniformly distributed in this section of grouting curtain；
5, curtain section is replaced, aforementioned process is repeated, obtains the supplemental characteristic of full curtain section；
6, the apparent resistivity that each record point is calculated by calculation formula of apparent resistivity, draws grouting curtain apparent resistivity respectively
With polarizability isogram, with reference to Fig. 6, from the identification synthetic abnormality domain on apparent resistivity and polarizability isogram, in conjunction with
The defect size and geometric position of engineering geology and hydrogeologic data identification grouting curtain.
Embodiment five
Based on the slip casting curtain drawn out using bored grouting curtain quality determining method in embodiment one to example IV
Curtain potential difference isogram, polarizability isogram or apparent resistivity isoline figure, the present embodiment five is open to be further calculated out
Potential difference relative variation is at figure or polarizability relative variation at figure or apparent resistivity relative variation at the method for figure：
1, assume there is N number of drilling on curtain, each drilling is observed provided with M depth point, obtains (N-1) * M altogether
Record point data；Record point wherein apart from the same depth of earth's surface shares M groups, every group of (N-1) a data；
2, one group of data in M group data are taken to calculate average value G, each measuring point data X is compared with average value G in the group
Compared with calculating relative changing value, the i.e. new parameter of [(X-G)/G] as the measuring point；
3, the data of every group of depth point are all converted into new parameter in this way；
4, using the new parameter on curtain draw potential difference or or polarizability or the transformed isogram of apparent resistivity, root
According to the positive or negative abnormal area on isogram, the defect size of incorporation engineering geology and hydrogeologic data identification grouting curtain
The geometric position and.
The foregoing is merely the preferred embodiment of the present invention, are not intended to limit the scope of the invention, every at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
In the scope of patent protection that other related technical areas are included in the present invention.
Claims (8)
1. a kind of bored grouting curtain quality determining method, which is characterized in that including：
S1, be drilled with along the both ends of its trend in curtain it is at least a pair of for electric drilling, lay in for electric drilling it is corresponding at least
The power supply terminal of a pair of positive and negative current electrode, the current electrode and electrical measuring instrument, connects,
S2, is arranged multiple measurements drillings on the connecting line on curtain, between positive and negative current electrode, each to measure drilling and equidistantly sets
It sets, adjacent two for a pair of of measuring electrode, the measurement terminal of the measuring electrode and electrical measuring instrument, are arranged in electric drilling
Connection,
S3 starts the electrical measuring instrument, is powered to underground by current electrode, measures the potential difference between two measuring electrodes
Value or apparent resistivity value or polarizability value, geometry midpoint of the record point between two measuring electrodes,
S4 makes measuring electrode equidistantly be moved along drilling depth direction is measured, and measures measuring electrode in different depth position
Potential difference or apparent resistivity value on record point or polarizability value,
Measuring electrode is replaced to different measurement drilling, repeats step S4 by S5,
S6 draws curtain potential difference isogram or or curtain apparent resistivity isoline figure or curtain according to step S4 and step S5
Curtain polarizability isogram, the abnormal area in figure are the defect area of grouting curtain.
2. bored grouting curtain quality determining method as described in claim 1, which is characterized in that in step sl, the confession
Electrode is set to the peripheral position except curtain, and curtain is located at the centre position of positive and negative current electrode.
3. bored grouting curtain quality determining method as claimed in claim 2, which is characterized in that the positive and negative current electrode
The distance between be at least 3 times of curtain length.
4. bored grouting curtain quality determining method as described in claim 1, which is characterized in that in step sl, the confession
Electrode is set on curtain, and the distance between positive and negative described current electrode is less than the length of the curtain；
Curtain is divided into one section or more of multistage and carries out segmentation detection.
5. bored grouting curtain quality determining method as described in claim 1, which is characterized in that the power supply terminal is powered
For alternating current or direct current or periodic signal of square wave electricity or programming Control frequency variation signal electricity.
6. bored grouting curtain quality determining method as described in claim 1, which is characterized in that in step sl, the confession
Electrode is point source or line power supply, and when the more than clock synchronization of the point source, point source vertically equidistantly arranges, or along vertical
Directly direction is moved towards in curtain equidistantly to arrange.
7. bored grouting curtain quality determining method as described in claim 1, which is characterized in that in the step S3-S5, institute
The computational methods for stating apparent resistivity are：
Measurement potential difference between two measuring electrodes is denoted as Δ U ', and for record point positioned at the geometry midpoint of two electrodes, I is to be supplied when measuring
Electrical circuit electric current, k are electrode coefficient, and expression formula is：
Wherein, ρ is the resistivity of curtain-grouting material, and Ha and Hb are respectively the depth of positive and negative current electrode, and L is positive and negative power supply electricity
Electrode spacing between pole, R1 are that one of two measuring electrodes arrive the distance between positive current electrode, and R2 is the another of two measuring electrodes
The distance between to positive current electrode, h1, h2 are the depth of two measuring electrode,
The apparent resistivity of the point is：ρs=k Δs U '/I.
8. bored grouting curtain quality determining method as claimed in claim 7, which is characterized in that the detection method is also wrapped
It includes：
S7, it is assumed that have N number of drilling on curtain, each drilling is observed provided with M depth point, obtains (N-1) * M notes altogether
Record point data；Record point wherein apart from the same depth of earth's surface shares M groups, every group of (N-1) a data；Take one in M group data
Group data calculate average value G, and each measuring point data X calculates relative changing value compared with average value G in the group, i.e., [(X-G)/
G] new parameter as the measuring point；The potential difference, polarizability or apparent resistivity data of every group of depth point are all changed in this way
It is counted as new parameter；Using the new parameter on curtain draw potential difference or or polarizability or the transformed isogram of apparent resistivity,
Correspond to respectively potential difference relative variation at figure, polarizability relative variation at figure or apparent resistivity relative variation at
Figure.
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