CN111123364A - Method for detecting seepage damage of anti-seepage geomembrane of household garbage landfill - Google Patents
Method for detecting seepage damage of anti-seepage geomembrane of household garbage landfill Download PDFInfo
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Abstract
The application provides a method for detecting seepage damage of an impermeable geomembrane of a household garbage landfill, which has the working principle that water in a garbage pile is detected to seep out of the impermeable geomembrane by adopting a high-density electrical method, if dirty water, garbage water and other water in the garbage pile above the impermeable geomembrane are found to penetrate through the impermeable geomembrane and enter soil or rock stratum below the impermeable geomembrane, the impermeable geomembrane is judged to have seepage, and a seepage area is positioned.
Description
Technical Field
The invention relates to the technical field of seepage-proofing detection, in particular to a method for detecting seepage damage of a seepage-proofing geomembrane of a household garbage landfill.
Background
The geomembrane (impermeable membrane) is a waterproof barrier material taking high molecular polymer as a basic raw material, and mainly comprises the following components: the low-density polyethylene (LDPE) geomembrane, the high-density polyethylene (HDPE) geomembrane and the EVA geomembrane have excellent environmental stress cracking resistance and chemical corrosion resistance, have a large service temperature range and a long service life, are applied to refuse landfills, tailing storage fields, canal seepage prevention, dam seepage prevention, subway engineering and the like, and have the main mechanism that a water leakage channel is separated by the impermeability of a plastic film, and the large tensile strength and the large elongation rate of the plastic film bear water pressure and adapt to field deformation.
The composite geomembrane is a geomembrane used as an anti-seepage base material and is a geotechnical anti-seepage material compounded with non-woven fabrics, wherein the non-woven fabrics are high-molecular short fiber chemical materials and are formed by needling or hot bonding, so that the composite geomembrane has high tensile strength and extensibility, after the composite geomembrane is combined with the geomembrane, the tensile strength and puncture resistance of a plastic film are increased, the friction coefficient of a contact surface is increased due to the rough surface of the non-woven fabrics, the composite geomembrane and a protective layer are favorably stabilized, and meanwhile, the composite geomembrane has good erosion resistance to bacteria and chemical action, is not afraid of the erosion of acid, alkali and salts, and has long service life under the condition of being used in a.
The detection result of the leakage positions of a large amount of geomembranes shows that a large amount of damages are caused by construction: about 24% of the failures occurred during the geomembrane installation construction phase, about 73% of the failures occurred during the geomembrane overburden laying construction phase, and about 2% of the failures occurred during the post-operational phase.
The HDPE geomembrane electric leakage damage detection method is the most reliable and effective method for detecting leakage damage of the current anti-seepage HDPE geomembrane. The basic principle of the HDPE geomembrane electrical leakage damage detection method is that an electric field is applied to an HDPE geomembrane, and a leakage point is found by moving the position of a detection device detecting a loop in the electric field. The main two modes for HDPE geomembrane electrical leakage damage detection are as follows: the two-electrode method and the water gun method. The double-electrode method is suitable for leakage damage detection under the condition that the HDPE geomembrane is covered by sand/soil, and the water gun method is suitable for leakage damage detection on the surface of the exposed HDPE geomembrane without any covering.
The anti-seepage film is paved at the bottom of the pit for anti-seepage treatment at the beginning of the construction of the household garbage landfill, the leakage damage of the anti-seepage film is detected once after the household garbage landfill is constructed, and if the leakage damage does not exist, the leakage damage can be accepted by engineering and then delivered for use. In the normal use process of the household garbage landfill, along with the extension of one year or another year of the use time, along with the increasing amount of garbage accumulated in the pit, whether leakage damage occurs to an anti-seepage film at the bottom of the pit needs to be regularly detected, and if leakage damage occurs, the garbage above a leakage point is generally dug out to repair the leakage point.
At present, various detection methods applied to leakage and damage of the anti-seepage geomembrane of the household garbage landfill exist in the prior art. However, due to the huge area of the domestic refuse landfill, the refuse stacking height of dozens of meters, the complex refuse types, the same type of substance, the same detection property and the like, the existing detection precision is low, the detection efficiency is low, and the detection of the leak point of the refuse landfill can be completed in a long time and a large amount of labor.
Therefore, how to provide a method for detecting leakage and damage of an impermeable geomembrane of a domestic garbage landfill to improve detection accuracy and detection efficiency is a technical problem that needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a method for detecting seepage and damage of an anti-seepage geomembrane of a household garbage landfill.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for detecting seepage damage of an anti-seepage geomembrane of a household garbage landfill site is characterized in that a high-density electrical method is adopted to detect seepage of water in a garbage pile outside the anti-seepage geomembrane so as to detect a seepage damage area of the anti-seepage geomembrane, and the method specifically comprises the following steps of:
1) and (3) electrode layout: inserting electrodes into a set depth on the top of a garbage pile in a domestic garbage landfill according to a designed interval to ensure that the electrodes are in good electrical contact with the garbage pile, and then connecting a lead with the electrodes;
2) data acquisition, namely setting acquisition parameters of the high-density electrical method instrument according to test requirements, wherein a first group of data is acquired by adopting a polar-running mode of a Wennar- α device;
3) data preprocessing: importing the collected data into a computer for data preprocessing, and importing the geometric information of the garbage heap into the ground electric section for terrain correction;
4) resistivity imaging: carrying out actual measurement data imaging by adopting resistivity imaging forward-backward software, and improving resistivity backward precision through parameter setting;
5) graphic display and anomaly analysis: and analyzing the resistivity abnormal area according to the section diagram obtained by imaging so as to define the area range of the seepage and damage of the impermeable geomembrane.
Preferably, between the step 1) and the step 2), before the electrodes are electrified, the method further comprises the step of injecting 2m into an insertion hole of each electrode inserted into the garbage pile3～5m3The water is made to seep downwards in the garbage pile, and the electrodes are electrified to start detection after the time is 5 to 8 hours from the time when the water injection is stopped.
Preferably, the step 2) further comprises acquiring a second set of data for the same section by using a pole-running mode of a schlenbel 1 apparatus.
Preferably, the step 2) further comprises collecting a third group of data on the same section by adopting a pole running mode of the temperature application 1 device.
Preferably, in the step 2), a first group of electrodes are arranged on the top of the garbage pile in the east-west direction to form a first row measuring line, a second group of electrodes are arranged on the top of the garbage pile in the east-west direction to form a second row measuring line, a third group of electrodes are arranged on the top of the garbage pile in the east-west direction to form a third row measuring line, and the first row measuring line, the second row measuring line and the third row measuring line are sequentially arranged from south to north and have a row spacing of 20 meters;
arranging a fourth group of electrodes on the top of the garbage pile according to the north-south direction to form a first row measuring line, arranging a fifth group of electrodes on the top of the garbage pile according to the north-south direction to form a second row measuring line, arranging a sixth group of electrodes on the top of the garbage pile according to the north-south direction to form a third row measuring line, and sequentially arranging the first row measuring line, the second row measuring line and the third row measuring line from east to west at a row distance of 20 m.
Preferably, the detection result of the high-density electrical method is used as a primary resistivity abnormal area, then the secondary detection and screening are carried out on the primary resistivity abnormal area by adopting a ground penetrating radar method, and the detection results of the high-density electrical method and the ground penetrating radar method are integrated, so that the leakage damage area of the anti-seepage geomembrane is finally determined.
The application provides a method for detecting seepage damage of an impermeable geomembrane of a domestic garbage landfill, which has the working principle that water in a garbage pile is detected to seep out of the impermeable geomembrane by adopting a high-density electrical method, if dirty water, garbage water and the like in the garbage pile above the impermeable geomembrane are found to penetrate through the impermeable geomembrane and enter soil below the impermeable geomembrane or rock strata, the impermeable geomembrane is judged to leak, and a seepage area is positioned to detect the seepage damage area of the impermeable geomembrane.
Among the direct current resistivity sounding methods, the high density resistivity method plays an increasingly important role in finding underground water, dam leakage exploration and the like by virtue of the outstanding advantages of high working efficiency, large reflected earth information amount, low working cost, simple and convenient measurement and the like. The principle of the method is the same as that of a common resistivity method, the principle is different in that high-density observation points are arranged in observation, the working device combination realizes dense-point matrix arrangement of electrodes, the method is an array exploration method, when in field measurement, all electrodes (dozens to hundreds) are arranged on measuring points, and then the rapid and automatic acquisition of data can be realized by using a program-controlled electrode change-over switch and a micro-computer engineering electrical measuring instrument, so that the density of space power supply and sampling is increased, and the longitudinal and transverse resolution capability and the working efficiency are improved.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate the features and advantages of the invention and not to limit the scope of the claims.
The application provides a method for detecting seepage damage of an anti-seepage geomembrane of a household garbage landfill, which is used for detecting seepage of water in a garbage pile outside the anti-seepage geomembrane by adopting a high-density electrical method so as to detect a seepage damage area of the anti-seepage geomembrane, and specifically comprises the following steps of:
1) and (3) electrode layout: inserting electrodes into a set depth on the top of a garbage pile in a domestic garbage landfill according to a designed interval to ensure that the electrodes are in good electrical contact with the garbage pile, and then connecting a lead with the electrodes;
2) data acquisition, namely setting acquisition parameters of the high-density electrical method instrument according to test requirements, wherein a first group of data is acquired by adopting a polar-running mode of a Wennar- α device;
3) data preprocessing: importing the collected data into a computer for data preprocessing, and importing the geometric information of the garbage heap into the ground electric section for terrain correction;
4) resistivity imaging: carrying out actual measurement data imaging by adopting resistivity imaging forward-backward software, and improving resistivity backward precision through parameter setting;
5) graphic display and anomaly analysis: and analyzing the resistivity abnormal area according to the section diagram obtained by imaging so as to define the area range of the seepage and damage of the impermeable geomembrane.
In one embodiment of the application, between the step 1) and the step 2), before the step of electrifying the electrodes, the method further comprises the step of injecting 2m into an insertion hole of each electrode into the garbage pile3～5m3The water is enabled to seep downwards in the garbage pile, and the electrodes are electrified to start detection after the time is timed for 5-8 hours from the time when the water injection is stopped;
here, as most of the garbage piles are wet or contain accumulated water, the accumulated water in the garbage piles can flow downwards through the damaged areas on the geomembranes, when the method provided by the application finds that dirty water, garbage water and other water in the garbage piles above the anti-seepage geomembranes penetrate through the anti-seepage geomembranes and enter the soil or rock strata below the anti-seepage geomembranes, the anti-seepage geomembranes are judged to have seepage, and the seepage areas are positioned;
if the garbage pile contains less accumulated water during field detection, the flow rate of the garbage pile permeating into soil below the impermeable geomembrane or rock stratum is smaller, and the water seepage volume is smaller, because of water seepageThe volume ratio is close to the upper limit of the detection precision of a high-density electrical method, so that the detection omission or inaccurate detection of the method is easily caused, and the error is larger, therefore, 2m is injected into the insertion hole before the electrode is electrified3～5m3The electrode is electrified to start detection after the water is allowed to seep downwards for 5-8 hours, and the time of 5-8 hours is enough for 2m3～5m3The water of (a) penetrates the impermeable geomembrane entirely into the soil or rock stratum below the impermeable geomembrane and is 2m3～5m3The volume of the water is large enough to meet the detection precision range of the high-density electrical method, thereby avoiding missing detection or larger detection error.
In an embodiment of the present application, step 2) further includes acquiring a second set of data for the same cross section in a pole-running manner using a schlenebel 1 apparatus.
In an embodiment of the present application, step 2) further includes collecting a third set of data on the same cross section by using a polar-tracking method of the temperature application 1 device.
The three electrode running modes are four electrode devices, the three electrode running modes are smaller in influence on terrain than three electrode devices, no remote electrode is required to be placed, power supply voltage can be reduced, interference can be suppressed, the device is beneficial to enhancing effective section signal acquisition, and the device is applicable to three temperature sensor electrode temperature sensor electrode temperature sensor electrode device electrode temperature sensor electrode temperature sensor electrode device electrode temperature sensor electrode device electrode.
In one embodiment of the application, in step 2), a first group of electrodes are arranged in an east-west direction on the top of the garbage pile to form a first row measuring line, a second group of electrodes are arranged in the east-west direction on the top of the garbage pile to form a second row measuring line, a third group of electrodes are arranged in the east-west direction on the top of the garbage pile to form a third row measuring line, the first row measuring line, the second row measuring line and the third row measuring line are sequentially arranged from south to north, and the row spacing is 20 meters;
arranging a fourth group of electrodes on the top of the garbage pile according to the north-south direction to form a first row measuring line, arranging a fifth group of electrodes on the top of the garbage pile according to the north-south direction to form a second row measuring line, arranging a sixth group of electrodes on the top of the garbage pile according to the north-south direction to form a third row measuring line, and sequentially arranging the first row measuring line, the second row measuring line and the third row measuring line from east to west at a row distance of 20 m;
here, the detection results of the first row measuring line, the second row measuring line and the third row measuring line form three east-west detection cross-sectional views which are spaced by 20 meters from each other, the detection results of the first column measuring line, the second column measuring line and the third column measuring line form three south-north detection cross-sectional views which are spaced by 20 meters from each other, the three east-west detection cross-sectional views which are spaced by 20 meters from each other and the three south-north detection cross-sectional views which are spaced by 20 meters from each other form three-dimensional grid maps of three rows and three columns, and the 6 cross-sectional views are mutually contrasted and combined to display the distribution situation of the resistivity in the garbage pile from different angles.
In one embodiment of the application, a detection result of a high-density electrical method is used as a primary resistivity abnormal area, then a ground penetrating radar method is adopted to carry out secondary detection and screening on the primary resistivity abnormal area, and the detection results of the high-density electrical method and the ground penetrating radar method are integrated, so that a leakage damage area of the anti-seepage geomembrane is finally determined;
the high-density electrical method is sensitive to the low resistor body and obviously reflects underground water accumulation or water seepage, but can not well reflect the very small-scale water accumulation or water seepage due to the influence of the polar distance and the detection depth, and the high-density electrical method is not easy to judge the high resistor body, so that the conditions of erroneous judgment and missing judgment are easy to occur; the ground penetrating radar method has high resolution, and the resolution on small-scale water accumulation or water seepage is high; during detection of a water-rich area, radar waves emitted by a ground penetrating radar are subjected to strong amplitude reflection in an aquifer, electromagnetic waves are subjected to multiple strong reflections according to a certain rule when penetrating the aquifer, diffraction and heat dissipation phenomena are generated in the water-rich area, and information below the aquifer is covered; therefore, the combination of the high-density electrical method and the ground penetrating radar method complements the respective defects and advantages, and can improve the detection result and reduce the multi-solution;
the comprehensive application of the high-density electrical method and the ground penetrating radar method can not only divide the electrical distribution of the underground through the high-density electrical method, but also define the position where the abnormality is likely to occur and guide the ground penetrating radar to carry out secondary key detection on the abnormal area; the ground penetrating radar can detect tiny abnormality, so that the missing detection caused by overlarge polar distance of a high-density electrical method is made up, and the defect that the high-density electrical method has large detection depth, reduced resolution and larger inference error of abnormal burial depth is made up; meanwhile, the two methods are comprehensively applied, and the advantages of the two methods are complementary, so that the problem of judging tiny abnormity can be solved, and the problems that signals of the ground penetrating radar are reflected and absorbed in a water-rich area and geophysical prospecting information below the water-rich area is covered can be solved.
For further understanding of the present invention, the method for detecting leakage and breakage of an impermeable geomembrane in a domestic refuse landfill according to the present invention is described in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
A method for detecting seepage damage of an anti-seepage geomembrane of a household garbage landfill site is characterized in that a high-density electrical method is adopted to detect seepage of water in a garbage pile outside the anti-seepage geomembrane so as to detect a seepage damage area of the anti-seepage geomembrane, and the method specifically comprises the following steps of:
1) and (3) electrode layout: inserting electrodes into a set depth on the top of a garbage pile in a domestic garbage landfill according to a designed interval to ensure that the electrodes are in good electrical contact with the garbage pile, and then connecting a lead with the electrodes;
before the electrodes are electrified, the method also comprises the step of injecting 2m into an insertion hole of each electrode into the garbage pile3～5m3The water is enabled to seep downwards in the garbage pile, and the electrodes are electrified to start detection after the time is timed for 5-8 hours from the time when the water injection is stopped;
2) data acquisition, namely setting acquisition parameters of the high-density electrical method instrument according to test requirements, wherein a first group of data is acquired by adopting a polar-running mode of a Wennar- α device;
the method also comprises the steps of collecting a second group of data on the same section by adopting a pole running mode of a Schlenbel 1 device;
the method also comprises the step of collecting a third group of data on the same section in a pole running mode of a temperature application 1 device;
in the step 2), arranging a first group of electrodes on the top of the garbage pile in the east-west direction to form a first row measuring line, arranging a second group of electrodes on the top of the garbage pile in the east-west direction to form a second row measuring line, arranging a third group of electrodes on the top of the garbage pile in the east-west direction to form a third row measuring line, wherein the first row measuring line, the second row measuring line and the third row measuring line are sequentially arranged from south to north and the row spacing is 20 meters;
arranging a fourth group of electrodes on the top of the garbage pile according to the north-south direction to form a first row measuring line, arranging a fifth group of electrodes on the top of the garbage pile according to the north-south direction to form a second row measuring line, arranging a sixth group of electrodes on the top of the garbage pile according to the north-south direction to form a third row measuring line, and sequentially arranging the first row measuring line, the second row measuring line and the third row measuring line from east to west at a row distance of 20 m;
3) data preprocessing: importing the collected data into a computer for data preprocessing, and importing the geometric information of the garbage heap into the ground electric section for terrain correction;
4) resistivity imaging: carrying out actual measurement data imaging by adopting resistivity imaging forward-backward software, and improving resistivity backward precision through parameter setting;
5) graphic display and anomaly analysis: analyzing the resistivity abnormal area according to the cross-section diagram obtained by imaging so as to define the area range of seepage and damage of the anti-seepage geomembrane;
6) and taking the detection result of the high-density electrical method as a primary resistivity abnormal area, then carrying out secondary detection and screening on the primary resistivity abnormal area by adopting a ground penetrating radar method, and integrating the detection results of the high-density electrical method and the ground penetrating radar method, thereby finally determining the leakage damage area of the anti-seepage geomembrane.
The devices and methods not described in detail in this application are all the prior art and are not described again.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. The method for detecting the seepage damage of the anti-seepage geomembrane of the household garbage landfill is characterized by detecting the seepage of water in a garbage pile outside the anti-seepage geomembrane by adopting a high-density electrical method so as to detect the seepage damage area of the anti-seepage geomembrane, and specifically comprises the following steps of:
1) and (3) electrode layout: inserting electrodes into a set depth on the top of a garbage pile in a domestic garbage landfill according to a designed interval to ensure that the electrodes are in good electrical contact with the garbage pile, and then connecting a lead with the electrodes;
2) data acquisition, namely setting acquisition parameters of the high-density electrical method instrument according to test requirements, wherein a first group of data is acquired by adopting a polar-running mode of a Wennar- α device;
3) data preprocessing: importing the collected data into a computer for data preprocessing, and importing the geometric information of the garbage heap into the ground electric section for terrain correction;
4) resistivity imaging: carrying out actual measurement data imaging by adopting resistivity imaging forward-backward software, and improving resistivity backward precision through parameter setting;
5) graphic display and anomaly analysis: and analyzing the resistivity abnormal area according to the section diagram obtained by imaging so as to define the area range of the seepage and damage of the impermeable geomembrane.
2. The detection method according to claim 1, wherein between the step 1) and the step 2), before the step of energizing the electrodes, the method further comprises the step of injecting 2m of the electrodes into the insertion holes of each electrode into the garbage pile3～5m3The water is made to seep downwards in the garbage pile, and the electrodes are electrified to start detection after the time is 5 to 8 hours from the time when the water injection is stopped.
3. The detection method according to claim 1, wherein the step 2) further comprises collecting a second set of data for the same cross section by using a pole-running mode of a Schlenebel 1 device.
4. The detection method according to claim 3, wherein the step 2) further comprises collecting a third set of data for the same cross section by using a polar-tracking method of a temperature application 1 device.
5. The detection method according to any one of claims 1 to 4, wherein in the step 2), a first group of electrodes are arranged in an east-west direction on the top of the garbage pile to form a first line, a second group of electrodes are arranged in an east-west direction on the top of the garbage pile to form a second line, a third group of electrodes are arranged in an east-west direction on the top of the garbage pile to form a third line, and the first line, the second line and the third line are sequentially arranged from south to north and have a line spacing of 20 meters;
arranging a fourth group of electrodes on the top of the garbage pile according to the north-south direction to form a first row measuring line, arranging a fifth group of electrodes on the top of the garbage pile according to the north-south direction to form a second row measuring line, arranging a sixth group of electrodes on the top of the garbage pile according to the north-south direction to form a third row measuring line, and sequentially arranging the first row measuring line, the second row measuring line and the third row measuring line from east to west at a row distance of 20 m.
6. The detection method as claimed in claim 5, wherein the detection result of the high-density electrical method is used as a primary resistivity abnormal area, then the secondary detection and screening are carried out on the primary resistivity abnormal area by adopting a ground penetrating radar method, and the detection results of the high-density electrical method and the ground penetrating radar method are integrated, so that the leakage damage area of the impermeable geomembrane is finally determined.
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Cited By (4)
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| CN111912587A (en) * | 2020-07-10 | 2020-11-10 | 中国环境科学研究院 | Method and system for evaluating leakage condition and positioning damage of solid waste land disposal facility |
| CN112541901A (en) * | 2020-12-15 | 2021-03-23 | 重庆商勤科技有限公司 | Method and device for detecting integrity of impervious lining of refuse landfill and storage medium |
| 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 |
| CN116594069A (en) * | 2023-07-19 | 2023-08-15 | 北京建工环境修复股份有限公司 | Effective complex resistivity data area screening method for shallow surface tectorial membrane contaminated sites |
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| CN111912587A (en) * | 2020-07-10 | 2020-11-10 | 中国环境科学研究院 | Method and system for evaluating leakage condition and positioning damage of solid waste land disposal facility |
| CN111912587B (en) * | 2020-07-10 | 2021-04-27 | 中国环境科学研究院 | Method and system for evaluating leakage condition and positioning damage of solid waste land disposal facility |
| CN112541901A (en) * | 2020-12-15 | 2021-03-23 | 重庆商勤科技有限公司 | Method and device for detecting integrity of impervious lining of refuse landfill and storage medium |
| 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 |
| CN116594069A (en) * | 2023-07-19 | 2023-08-15 | 北京建工环境修复股份有限公司 | Effective complex resistivity data area screening method for shallow surface tectorial membrane contaminated sites |
| CN116594069B (en) * | 2023-07-19 | 2023-09-15 | 北京建工环境修复股份有限公司 | Effective complex resistivity data area screening method for shallow surface tectorial membrane contaminated sites |
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