CN116609395A - Method for determining depth and thickness of vertical separation wall - Google Patents
Method for determining depth and thickness of vertical separation wall Download PDFInfo
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- CN116609395A CN116609395A CN202310236191.0A CN202310236191A CN116609395A CN 116609395 A CN116609395 A CN 116609395A CN 202310236191 A CN202310236191 A CN 202310236191A CN 116609395 A CN116609395 A CN 116609395A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000000926 separation method Methods 0.000 title claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 34
- 230000004888 barrier function Effects 0.000 claims abstract description 25
- 238000005553 drilling Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 6
- 238000011835 investigation Methods 0.000 claims description 6
- 238000013102 re-test Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000009933 burial Methods 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 4
- 238000000691 measurement method Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 230000002411 adverse Effects 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000006467 substitution reaction Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 229910000278 bentonite Inorganic materials 0.000 description 4
- 239000000440 bentonite Substances 0.000 description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 4
- 238000002247 constant time method Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 101710179734 6,7-dimethyl-8-ribityllumazine synthase 2 Proteins 0.000 description 1
- 101710186609 Lipoyl synthase 2 Proteins 0.000 description 1
- 101710122908 Lipoyl synthase 2, chloroplastic Proteins 0.000 description 1
- 101710101072 Lipoyl synthase 2, mitochondrial Proteins 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/18—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring depth
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- General Physics & Mathematics (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a method for determining the depth and thickness of a vertical barrier wall, which comprises drilling sampling detection, high-density survey lines, measurement parameter setting, data acquisition, data interpretation and inversion result interpretation. The method for determining the depth and the thickness of the vertical separation wall is applied to the separation management and control of the polluted site or the matched repair technology, can have temporary and permanent repair functions, is suitable for repairing a large amount of industrial polluted sites, has more reasonable and reliable data, provides an important basis for the construction quality judgment of the vertical separation wall, ensures the effectiveness of the vertical separation wall as a risk management and control technology applied in the environment repair field, and has great application value.
Description
Technical Field
The invention belongs to the technical field of environmental remediation, and particularly relates to a method for determining the depth and thickness of a vertical barrier wall.
Background
The vertical separation wall is an environmental restoration field, particularly a common risk management and control measure for the pollution site control and restoration direction, is mostly applied to the pollution site separation management or the matched restoration technology, can have temporary and permanent restoration functions, and is suitable for restoration of a large amount of industrial pollution sites.
Aiming at the geophysical prospecting work of the bentonite impermeable curtains, a high-density earth surface electric method is adopted in the initial stage, geophysical prospecting is carried out on the typical bentonite impermeable curtains in different construction time stages, the basic background resistivity condition of the field and the resistivity response condition of bentonite in the impermeable curtains in different construction time stages are obtained, and the diffusion range of the bentonite in the impermeable curtains is preliminarily deduced; and in the later stage, a cross-hole resistivity CT method is adopted, and the drilling layout position and depth of the cross-hole resistivity CT method are determined by combining the ground surface detection result and the site construction condition and detected by the cross-hole resistivity CT method.
But in practical application, the thickness and the depth of the vertical barrier wall cannot be accurately predicted, so that the thickness and the depth are insufficient and seriously exceeded, the construction quality is low, and the barrier effect is poor.
Disclosure of Invention
The present invention is directed to a method for determining the depth and thickness of a vertical barrier wall, which solves the above-mentioned problems of the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a method of determining the depth and thickness of a vertical barrier wall comprising the steps of:
s1: drilling holes, sampling and detecting, namely arranging drilling holes on two sides of the barrier wall according to the position and depth of the barrier wall, discharging a well pipe, taking a water sample after well flushing, and carrying out multi-parameter testing;
s2: arranging high-density measuring lines, configuring electrode bars along the preset measuring lines, configuring electrodes according to a measuring method, connecting the measuring lines with a measuring system, and detecting the grounding resistance;
s3: measuring parameter setting, namely determining the arrangement mode of the electrodes and the electrode spacing according to the surveyed targets and geological profiles;
s4: data acquisition, namely, carrying out observation record on data of working date, meteorological information, point location coordinates, current values and voltage values;
s5: data interpretation, namely importing acquired data into a computer, performing abnormal data pre-processing on the measured data, converting the processed measured data into a format, inverting the measured data, and storing an inversion result;
s6: and interpreting the inversion result, namely interpreting the inversion result and determining the depth and thickness of the survey target.
Preferably, in step S1, the distance between the drilled holes on two sides and the distance between the drilled holes on the side vertical face of the vertical partition wall are at least 1m, the depth of the drilled holes is not smaller than the depth of the vertical partition wall, the well pipe adopts a PVC pipe, the pipe wall adopts laser slotting or drilling, the distance between the drilled holes is about 1cm, and the multiple parameters comprise water sample detection temperature, pH, OPR, resistivity and TDS.
In any of the above embodiments, it is preferable that in step S2, the measurement system employs a ABEM Terrameter LS electrical meter.
In any of the above schemes, in step S3, it is preferable that the maximum power supply electrode distance is 4-6 times of the top buried depth of the investigation target, and the measurement electrode distance is not greater than the top buried depth of the investigation target.
In any of the above schemes, preferably, in step S4, working date and weather information are recorded, coordinates of a start point and a control point of a measuring line are determined and recorded, and a description is made of a terrain and a surface building near the measuring line, and when the slope of the terrain is greater than 15 °, elevation measurement is performed on each electrode bar;
adjusting the measurement parameters according to the field conditions, and collecting data;
respectively adopting different observation devices to complete data acquisition;
for each observation of arrangement, the total number of dead pixels should not exceed l% of the total number of measurements, and for retests after unexpected interruption, retests should have no less than 2 depth layers;
for the two-pole and three-pole observation devices, voltage and current values are collected, and when data are processed, apparent resistivity values are calculated separately; when the distance between the far electrodes is not more than 5 times, performing far electrode correction in data processing;
in field observation, the arrangement positions are recorded, the positions of special environmental factors are noted, and the positions are marked on a sketch.
In any of the above embodiments, preferably, in step S5,
(1) Data reading and checking: the field measurement data stored in the measurement host computer is imported into a computer by a data line, whether abnormal data points exist in the measurement data is checked, and the preliminary processing is carried out;
(2) Converting the data format: converting the imported data into a format which can be identified by inversion software, and setting a measurement method, the number of electrodes and electrode distance parameters when the measurement data of the high-density resistivity method are converted into the format;
(3) Inversion: setting proper inversion parameters, inverting the data, and storing the inversion result. Preferably in any of the above schemes, (1) performing secondary data processing during inversion, comprising:
(1) defective pixel rejection: in the process of collecting data, eliminating and interpolating substitution processing is needed to eliminate or reduce adverse effects on inversion results on false or abrupt 'sharp point' data with larger magnitude, which are generated by instruments, human errors, external interference or poor electrode grounding;
(2) inversion of the terrain: the measurement result of the high-density resistivity method is greatly influenced by the terrain, and the inversion of the data with the terrain is carried out by recording the positions of representative points in the measuring line and Gao Chengxu;
(2) Data mix inversion: the data measured by different devices of the same geophysical method can be fused together to carry out inversion, so that the reliability of inversion results is effectively improved.
The invention has the technical effects and advantages that: the method for determining the depth and the thickness of the vertical barrier wall detects the upper region of the high-density measuring line of the earth surface, calculates the resistivity profile through the potential difference between the electrodes on the measuring line of the earth surface, and obtains the resistivity profile in the measuring line range through inversion calculation of the resistivity profile, thereby achieving the purpose of detecting the geological condition in the measuring line range and realizing the delineation of the vertical barrier wall range; the method has the advantages that the depth area is detected by the cross-hole high-density measuring line, the resistivity distribution section diagram between two drilling holes is obtained through inversion by observing the current and voltage data of the cross-hole, and then the resistivity section of the detection area is obtained through inversion calculation of the data, so that the depth range of the vertical barrier wall is determined, the obtained data is more reasonable and reliable, an important basis is provided for judging the construction quality of the vertical barrier wall, the effectiveness of the vertical barrier wall applied to the environmental remediation field as a risk management and control technology is ensured, and the method has great application value.
Drawings
FIG. 1 is a schematic illustration of a high density survey line layout of the earth's surface of the present invention;
FIG. 2 is a schematic diagram of a cross-hole high density survey line arrangement of the present invention.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
The present invention provides a method for determining the depth and thickness of a vertical barrier wall as shown in fig. 1-2, comprising the steps of:
the first step: drilling and sampling detection, namely arranging drilling holes on two sides of the barrier wall according to the position and depth of the barrier wall, discharging a well pipe, taking a water sample after well flushing, and carrying out multi-parameter test.
And a second step of: arranging high-density measuring lines, configuring electrode bars along the preset measuring lines, and configuring electrodes according to a measuring method; the test line is connected with the measurement system while detecting the ground resistance.
And a third step of: and (5) measuring parameter setting, and determining the arrangement mode of the electrodes and the electrode spacing according to the surveyed targets, geological profiles and the like.
Fourth step: and data acquisition, namely, observing and recording data such as working date, meteorological information, point position coordinates, current values, voltage values and the like.
Fifth step: and data interpretation, namely importing the acquired data into a computer, performing abnormal data preprocessing on the measured data, converting the processed measured data into a format, inverting the measured data, and storing an inversion result.
Sixth step: and interpreting the inversion result, namely interpreting the inversion result and determining the depth and thickness of the survey target.
The applicable conditions are as follows:
(1) There is a relatively significant resistivity difference between the survey target and the surrounding medium;
(2) Surveying the target at the surface can cause measurable anomalies;
(3) The electrical measurement abnormality of the survey target object can be distinguished from the interference background;
(4) The necessary grounding conditions are provided.
In the first step:
the distance between the drilling holes on the two sides and the distance between the side vertical surfaces of the vertical separation wall are at least 1m; the depth of the drilling hole is not less than the depth of the vertical partition wall; the well pipe adopts a PVC pipe, the pipe wall adopts laser slotting or drilling, and the interval is about 1cm; and (3) detecting parameters such as temperature, pH, OPR (oxidation-reduction potential), resistivity, TDS (hardness) and the like of the water sample.
In the second step:
the electrode bar spacing and the length of the measuring line determine the depth which can be detected, the spacing is large, the length of the measuring line can detect the deeper depth, but the resolution is reduced. Therefore, preliminary calculation is needed for the depth of the detection target, and an optimal balance point is selected between the electrode rod spacing and the length of the measuring line; before formal measurement, checking the grounding resistance and the communication condition of each electrode, and if necessary, filling water (or saline) into the grounding part of the electrode rod or replacing the original electrode rod with a plurality of electrodes in parallel connection so as to reduce the grounding resistance of the electrode; the measuring system adopts a ABEM Terrameter LS 2 electric method instrument.
In the third step:
(1) Arrangement of electrodes
High density resistivity method detection belongs to geometric detection, and proper electrode arrangement mode needs to be determined according to the surveyed targets, geological profiles and the like. The high-density resistivity method is classified into various measurement methods according to different electrode arrangement methods, and there are a wenna device method, a schlenz device method (abbreviated as schlenz method), a diode device method, and a dipole device method, which are commonly used. The temperature device and the Sbeber device are mainly applied to the gentle region of the stratum to make vertical section or sounding, and the dipole device is mainly applied to section survey.
(2) Electrode distance
The maximum power supply electrode distance is at least 4-6 times of the top burial depth of the investigation target object, and the measuring electrode distance is not more than the top burial depth of the investigation target object. In the field measurement process, main measurement parameters for determining the detection depth are as follows: the electrode distance L between the power supply electrodes and the electrode distance a between the measuring electrodes are related to the measurement mode. Whether the parameter selection is correct or not is measured, and whether the result of the measurement is good or bad is related.
In the fourth step:
(1) Recording working date and meteorological information, determining and recording coordinates of a starting point and a control point of a measuring line, properly describing terrains, surface buildings and the like near the measuring line, and measuring elevation of each electrode rod for later topography correction when the surface elevation difference is obvious (when the topography gradient is greater than 15 °);
(2) And adjusting the measurement parameters according to the field conditions, and collecting data. When measuring, the staff must pay attention to the electrifying reaction between the electrodes on the screen, and adjust the measuring parameters to re-measure if necessary;
(3) The data acquisition is completed by adopting different observation devices respectively, and the observation data of another observation device is replaced by adopting the mutually converted values in the same observation device;
(4) For each observation of arrangement, the total number of dead pixels should not exceed l% of the total number of measurements, and for retests after unexpected interruption, retests should have no less than 2 depth layers;
(5) For the two-pole and three-pole observation devices, voltage and current values should be collected, and when data processing is performed, apparent resistivity values should be calculated separately; when the distance between the far electrodes is not more than 5 times, the far electrode correction should be performed in the data processing;
(6) In field observation, the arrangement positions should be recorded, the positions of special environmental factors should be noted, and the positions should be marked on a sketch.
In the fifth step:
(1) Data reading and checking: and importing the field measurement data stored in the measurement host into a computer by using a data wire. And checking whether abnormal data points exist in the measured data, and performing pretreatment.
(2) Converting the data format: the imported data are converted into a format which can be identified by inversion software, and parameters such as a measurement method, the number of electrodes, electrode distances and the like are set when the measurement data of the high-density resistivity method are converted into the format.
(3) Inversion: setting proper inversion parameters, inverting the data, and storing the inversion result.
1) In order to obtain a more accurate inversion result, in combination with the actual measurement situation, secondary data processing can be performed in the inversion process, including:
(1) defective pixel rejection: in the process of collecting data, eliminating and interpolating substitution processing is needed to eliminate or reduce adverse effects on inversion results on false or abrupt 'sharp point' data with larger magnitude, which are generated by instruments, human errors, external interference or poor electrode grounding and the like;
(2) inversion of the terrain: the measurement results of the high-density resistivity method are greatly affected by the terrain, the positions of representative points in the recording line and Gao Chengxu are inverted with the terrain data.
2) Data mix inversion: the data measured by different devices of the same geophysical method can be fused together to carry out inversion, so that the reliability of inversion results is effectively improved.
In the sixth step:
the observation results of various devices are utilized and combined with other physical and chemical exploration data, drilling (or exploratory well) data and geological data to carry out mutual constraint and mutual interactive comprehensive inference interpretation on geometric parameters and electrical parameters of homologous anomaly causes and anomaly sources so as to improve interpretation accuracy and reduce multiple interpretation.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (7)
1. A method of determining the depth and thickness of a vertical barrier wall, comprising: the method comprises the following steps:
s1: drilling holes, sampling and detecting, namely arranging drilling holes on two sides of the barrier wall according to the position and depth of the barrier wall, discharging a well pipe, taking a water sample after well flushing, and carrying out multi-parameter testing;
s2: arranging high-density measuring lines, configuring electrode bars along the preset measuring lines, configuring electrodes according to a measuring method, connecting the measuring lines with a measuring system, and detecting the grounding resistance;
s3: measuring parameter setting, namely determining the arrangement mode of the electrodes and the electrode spacing according to the surveyed targets and geological profiles;
s4: data acquisition, namely, carrying out observation record on data of working date, meteorological information, point location coordinates, current values and voltage values;
s5: data interpretation, namely importing acquired data into a computer, performing abnormal data pre-processing on the measured data, converting the processed measured data into a format, inverting the measured data, and storing an inversion result;
s6: and interpreting the inversion result, namely interpreting the inversion result and determining the depth and thickness of the survey target.
2. A method of determining the depth and thickness of a vertical barrier wall according to claim 1, wherein: in the step S1, the distance between the drilled holes on two sides and the distance between the side vertical surfaces of the vertical separation wall are at least 1m, the depth of the drilled holes is not smaller than the depth of the vertical separation wall, the well pipe adopts a PVC pipe, the pipe wall adopts laser slotting or drilling, the distance between the two sides is about 1cm, and the multiple parameters comprise water sample detection temperature, pH, OPR, resistivity and TDS.
3. A method of determining the depth and thickness of a vertical barrier wall according to claim 1, wherein: in step S2, the measurement system employs a ABEM Terrameter LS electrical meter.
4. A method of determining the depth and thickness of a vertical barrier wall according to claim 1, wherein: in step S3, the maximum power supply electrode distance should be 4-6 times of the top burial depth of the investigation target object, and the measurement electrode distance is not greater than the top burial depth of the investigation target object.
5. A method of determining the depth and thickness of a vertical barrier wall according to claim 1, wherein: in step S4, recording working date and meteorological information, determining and recording coordinates of a starting point and a control point of a measuring line, describing a terrain and a surface building near the measuring line, and measuring elevation of each electrode rod when the terrain gradient is greater than 15 degrees;
adjusting the measurement parameters according to the field conditions, and collecting data;
respectively adopting different observation devices to complete data acquisition;
for each observation of arrangement, the total number of dead pixels should not exceed l% of the total number of measurements, and for retests after unexpected interruption, retests should have no less than 2 depth layers;
for the two-pole and three-pole observation devices, voltage and current values are collected, and when data are processed, apparent resistivity values are calculated separately; when the distance between the far electrodes is not more than 5 times, performing far electrode correction in data processing;
in field observation, the arrangement positions are recorded, the positions of special environmental factors are noted, and the positions are marked on a sketch.
6. A method of determining the depth and thickness of a vertical barrier wall according to claim 1, wherein: in the step S5 of the process of the present invention,
(1) Data reading and checking: the field measurement data stored in the measurement host computer is imported into a computer by a data line, whether abnormal data points exist in the measurement data is checked, and the preliminary processing is carried out;
(2) Converting the data format: converting the imported data into a format which can be identified by inversion software, and setting a measurement method, the number of electrodes and electrode distance parameters when the measurement data of the high-density resistivity method are converted into the format;
(3) Inversion: setting proper inversion parameters, inverting the data, and storing the inversion result.
7. A method of determining the depth and thickness of a vertical barrier wall according to claim 6, wherein: (1) Performing secondary data processing in the inversion process, including:
(1) defective pixel rejection: in the process of collecting data, eliminating and interpolating substitution processing is needed to eliminate or reduce adverse effects on inversion results on false or abrupt 'sharp point' data with larger magnitude, which are generated by instruments, human errors, external interference or poor electrode grounding;
(2) inversion of the terrain: the measurement result of the high-density resistivity method is greatly influenced by the terrain, and the inversion of the data with the terrain is carried out by recording the positions of representative points in the measuring line and Gao Chengxu;
(2) Data mix inversion: the data measured by different devices of the same geophysical method can be fused together to carry out inversion, so that the reliability of inversion results is effectively improved.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118551461A (en) * | 2024-07-29 | 2024-08-27 | 深圳大学 | GCL composite vertical barrier wall thickness determination method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118551461A (en) * | 2024-07-29 | 2024-08-27 | 深圳大学 | GCL composite vertical barrier wall thickness determination method and device |
| CN118551461B (en) * | 2024-07-29 | 2024-10-18 | 深圳大学 | GCL composite vertical barrier wall thickness determination method and device |
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