CN1677102A - Vertical seepage-proof engineering quality nondestructive detecting method - Google Patents
Vertical seepage-proof engineering quality nondestructive detecting method Download PDFInfo
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- CN1677102A CN1677102A CN 200410010780 CN200410010780A CN1677102A CN 1677102 A CN1677102 A CN 1677102A CN 200410010780 CN200410010780 CN 200410010780 CN 200410010780 A CN200410010780 A CN 200410010780A CN 1677102 A CN1677102 A CN 1677102A
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Abstract
The invention discloses a vertical impervious engineering quality non destructive surveying technique. Arrange two arrays of electric pole along the two sides of the impervious film with the line perpendicular to the film, the impervious film is at the middle point of the intersection. One side is power supply and the other is survey pole. Form power supply circuit with the first electric pole and another one in infinite distance one side while form a survey circuit on the other side surveying electric potential and current. Change the position of the power supply pole and the survey pole after the survey is complete and continues with next survey. Finish the scan of the film by continuously changing the position and surveying, obtaining a digital cross section which is the film electric resistance distribution section. The benefits of the invention is that there is no damage to the flood shielding facilities, and able to obtain a general, fast acknowledgement of the depth, quality, damage place, damage stage.
Description
Technical field:
The invention belongs to field of measuring technique, be specifically related to detect vertical plastic spreading curtain, concrete mixing pile cut-pff wall quality and the detection of hidden troubles in dams that is arranged at flood control dam upstream batter dam root with electric field, classification position is at G01V3/08.
Background technology:
Vertical plastic spreading and concrete cut-off wall are two kinds of construction methods of China's hydraulic department extensive employing in reinforcement projects on embankments in recent years.In the vertical seepage control work progress, antiseepage film or concrete cut-off wall be embedded in usually dykes and dams upstream batter dam root, to cut off the penetrating passage in the stratum, dam root below, the safety of protection embankment.
In the work progress of vertical plastic spreading, the speed that requires Kai Keng and shop to mould will be consistent, if open the excessive velocities in hole, the speed that mould the shop is crossed the hole of will collapsing slowly, can cause antiseepage film to lay the phenomenon of the volume end (depth of burying is not enough); The situation that groove depth is not enough, antiseepage film is scratched also can appear in some formation condition areas with complicated; Also can occur in the place of antiseepage film seam in addition in conjunction with untight situation.
The advantage that deep layer stirs cut-off wall is that consolidation effect is good, and reinforcing mode is flexible, and is widely applicable, and speed of application is fast, can make full use of former stratum sand, no spoir, and cost is lower.But in work progress,, stir bad and cause infiltration inclusion or hollow stake etc. to influence the factor of quality if Control work flow process well is easy to occur that cut-off wall is discontinuous, the degree of depth is not enough.
In order to prevent that vertical plastic spreading and deep layer from stirring the problems referred to above that occur in the cut-off wall construction and making dyke building still have hidden danger, antiseepage film or wall lay finish after, laying quality is in time detected, pinpointing the problems in time to handle is very important.Still do not have at present both at home and abroad a kind of desirable inspection means, detect and adopt manometer methods and according to dike inside and outside SEA LEVEL VARIATION analysis and judgement method and heavy excavation direct observational methods before and after the construction more.It is not comprehensive that wherein preceding two kinds of methods exist detection, and the polarization of hidden danger is poor, can only solve macroscopical qualitative question.A kind of method in back though be Direct observation, is limited by underground water table, can only observe superficial part.These two kinds of methods all exist the quality problems that antiseepage film lay is occurred detect not comprehensively, not concrete, and dykes and dams are had destruction; Considering from economy, safety responsibility, is worthless.Particularly antiseepage film is laid the quality problems that occur, and conventional detection is difficult to find out.How fast detecting vertical seepage control construction quality has become the task of top priority.
Summary of the invention
The purpose of this invention is to provide a kind of dykes and dams flood control works vertical plastic spreading and deep layer and stir not excavating of cut-off wall, testing is carried out on ground, and testing process is simple, convenient and rapid, and testing result is accurately reliable, overcomes the aforementioned deficiency of prior art.
Technical scheme of the present invention is " double row two electrode resistance rate methods ", is about to two row's electrodes and lays along the antiseepage film both sides, and the line of counter electrode is vertical with antiseepage film between arrangement, and makes the point midway of antiseepage film at line.The electrode of antiseepage film one side is made as the power supply utmost point, and the electrode of opposite side is for measuring the utmost point.During actual measurement, first electrode and the pole at infinity composition loop of arranging with a side power, and carry out current potential, current measurement with selected electrode and another pole at infinity formation measurement loop of opposite side electrode spread; After current potential, the current measurement of elected fixed electrode finishes, change the position that a side is arranged the power supply utmost point, carry out next DATA REASONING, point-to-point measurement like this is set when requiring when satisfying, and another group potential measurement is carried out in the potential electrode position that changes opposite side.Because two electrode spread are symmetrical in the point midway that the antiseepage film setting makes antiseepage film be in the power supply utmost point all the time and measures the utmost point, according to the data analysis pattern of traditional two utmost point measurement mechanisms, what record the data point reflection is the situation of point midway antiseepage film.The scanning survey to antiseepage film just can be finished in the position of so continuous change supply terminals and measurement point, and obtaining the data section at last is the apparent resistivity number of plies section of the parallelogram of antiseepage film distributing position.
Good effect of the present invention is: do not destroy the integrality of flood control installation and cause new dyke hidden danger, all testing is carried out on ground, testing result can provide quantitative description, can obtain comprehensively, fast the seepage proof curtain setting the degree of depth, overlap quality, have or not breakage and damaged position, situation that degree etc. relates to dyke safety.
The present invention is the application of bulk effect theory on the quality detection technology of dykes and dams flood control works vertical plastic spreading and deep layer stirring cut-off wall of electrostatic field.In order to study the physical essence of antiseepage film to the electrostatic field capability of influence, we simulate body plan antiseepage film in even stratum, bury the ground electric model of situation underground, the similar resistivity of antiseepage film is tending towards infinitely-great high resistant thin plate (see figure 1).For the ease of analyzing, we adopt the principle of equivalence that underground ground electric model is reduced to Fig. 2.
When point source A1 (I) was positioned at the ground on stratum, vertical interphase left side, A and interfacial distance were d, in order to find the solution the current potential U2 of any 1 M2 in the stratum that resistivity is ρ 2, adopted image method to find the solution the space distribution of current potential.Can learn:
U2＝(Iρ2/2π)(1-K
12)/r2
Wherein: 1-K
12=2 ρ 1/ (ρ 1+ ρ 2)
As seen when ρ 2 → ∝, 1-K
12→ 0, U2 → 0
When potential electrode MN across in the both sides, interface the time, the maximum that Δ U=U1-U2 becomes is according to formula ρ=K* Δ U/I
Know the apparent resistivity value maximum of this moment.
Because antiseepage film is not unlimited extension in the stratum, so the value of U2 can not be zero, but because the existence of antiseepage film makes MN across when the both sides, interface, and it is big that Δ U becomes relatively, and Here it is in the antiseepage film position reason of high resistant occurs.
When utilizing double row two utmost point devices to measure, in the side power supply of antiseepage film, opposite side is measured, and at this moment the resistivity of gained utilizes U2 to calculate, and it is unusual to show as low-resistance.
Comprehensive above-mentioned research situation, we know that the existence of antiseepage film has changed the distribution characteristics of electrostatic field, this has just constituted the basis that the method for utilizing resistivity is surveyed.We have determined the detection method of double row two utmost point scanning surveys according to the analysis of physical model that antiseepage film is distributed and geophysical method.
Description of drawings
Fig. 1 is the ground electric model figure of antiseepage film;
Fig. 2 is the simplified model figure of antiseepage film;
Fig. 3 is that double row two electrode resistance rate method detection systems are laid synoptic diagram;
Fig. 4 is the Data Position distribution plan.
Embodiment.
1, at first determines parameters such as double array apparatus type electrode number, the electrode number of plies, electrode gap, arrangement pitch.The user can change file parameters according to testing goal.
2, carry out the work layout of plastic foil 1, the power supply utmost point 2, the measurement utmost point 3, power supply 4 by Fig. 3 laying mode;
3, utilize electrical prospecting apparatus 5 to carry out pointwise, test item by item, and calculate its apparent resistivity value;
4, utilize centimetre paper or computing machine the apparent resistivity value sectional view such as to carry out and draw, wherein, horizontal ordinate is the horizontal range of electrode spread, and ordinate is the test point degree of depth (is equivalent to the A utmost point and M pole span from).Concrete distributing position such as Fig. 4.
Adopt adjacent three average modes of data to realize the smooth average of data in the work.The average purpose of data smoothing is to eliminate randomly electric field to the influence of image data.
d(l，n)＝(l-W
s)/2·d(l，n-1)+W
sd(l，n)+(1-W
s)/2·d(l，n+1)(13)
L in the formula, n are respectively the coordinate position of data point in the resistivity two dimensional cross-section.W
sBe the smoothness adjustment factor.Generally speaking, l 〉=W
s〉=1/3.Synoptic diagram is seen Fig. 4.
5 carry out antiseepage film buried depth and defective according to the resistivity anomaly feature in the apparent resistivity two dimensional cross-section explains.
In 6 real works, judge, must carry out the test of original background field, stratum in detection segment (both antiseepage film section one sides of detection), so that comparative analysis for more accurate.
Claims (1)
- Prevent perpendicular seepage quality lossless detection method, it is characterized in that " double row two electrode resistance rate methods ", being about to two row's electrodes lays along the antiseepage film both sides, the line of counter electrode is vertical with antiseepage film between arrangement, and make the point midway of antiseepage film at line, the electrode of antiseepage film one side is made as the power supply utmost point, the electrode of opposite side is for measuring the utmost point, during actual measurement, first electrode and the pole at infinity composition loop of arranging with a side power, and carry out current potential, current measurement with selected electrode and another pole at infinity formation measurement loop of opposite side electrode spread; The current potential of elected fixed electrode, after current measurement finishes, change a side and arrange the position of the power supply utmost point, carry out next DATA REASONING, point-to-point measurement like this, when satisfied setting requires, another group potential measurement is carried out in the potential electrode position that changes opposite side, because two electrode spread are symmetrical in the point midway that the antiseepage film setting makes antiseepage film be in the power supply utmost point all the time and measures the utmost point, data analysis pattern according to traditional two utmost point measurement mechanisms, what record the data point reflection is the situation of point midway antiseepage film, the position of so continuous change supply terminals and measurement point, just can finish the scanning survey to antiseepage film, obtaining the data section at last is the apparent resistivity number of plies section of the parallelogram of antiseepage film distributing position.
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| CNB2004100107804A CN100460868C (en) | 2004-04-01 | 2004-04-01 | Vertical seepage-proof engineering quality nondestructive detecting method |
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| CNB2004100107804A CN100460868C (en) | 2004-04-01 | 2004-04-01 | Vertical seepage-proof engineering quality nondestructive detecting method |
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| Publication Number | Publication Date |
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| CN1677102A true CN1677102A (en) | 2005-10-05 |
| CN100460868C CN100460868C (en) | 2009-02-11 |
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| CN101706354B (en) * | 2009-11-16 | 2011-04-20 | 河海大学 | Method for detecting anti-seepage effect of anti-seepage film |
| CN102367673A (en) * | 2011-09-13 | 2012-03-07 | 北京高能时代环境技术股份有限公司 | Vertical flexible barrier system for remediation of ecological environment |
| CN102539478A (en) * | 2011-12-15 | 2012-07-04 | 黄河水利委员会黄河水利科学研究院 | Method for continuous detection of high polymer impermeable wall |
| CN102621191A (en) * | 2012-03-29 | 2012-08-01 | 上海交通大学 | Electrical measurement method and device for detecting high polymer cutoff wall |
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| CN108981560A (en) * | 2018-05-25 | 2018-12-11 | 河海大学 | A kind of detection device and application method for the dyke seepage control film depth of burying |
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| CN101706354B (en) * | 2009-11-16 | 2011-04-20 | 河海大学 | Method for detecting anti-seepage effect of anti-seepage film |
| CN102367673A (en) * | 2011-09-13 | 2012-03-07 | 北京高能时代环境技术股份有限公司 | Vertical flexible barrier system for remediation of ecological environment |
| CN102539478A (en) * | 2011-12-15 | 2012-07-04 | 黄河水利委员会黄河水利科学研究院 | Method for continuous detection of high polymer impermeable wall |
| CN102621191A (en) * | 2012-03-29 | 2012-08-01 | 上海交通大学 | Electrical measurement method and device for detecting high polymer cutoff wall |
| CN102621191B (en) * | 2012-03-29 | 2014-08-27 | 上海交通大学 | Electrical measurement method and device for detecting high polymer cutoff wall |
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| CN116499661A (en) * | 2023-04-23 | 2023-07-28 | 华北有色工程勘察院有限公司 | Device and method for detecting leakage points of vertically paved high-resistance impermeable film |
| CN116499661B (en) * | 2023-04-23 | 2024-01-26 | 华北有色工程勘察院有限公司 | Device and method for detecting leakage points of vertically paved high-resistance impermeable film |
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