CN105158301A - Polluted soil detection method based on cross-hole resistivity CT method - Google Patents
Polluted soil detection method based on cross-hole resistivity CT method Download PDFInfo
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Abstract
The invention relates to the field of geotechnical engineering detection and testing and particularly relates to a polluted soil detection method based on a cross-hole resistivity CT method. The polluted soil detection method is characterized by comprising the following steps: arranging a detection line composed of a plurality of detection holes in a polluted region, wherein at least one end of the detection line is arranged in an unpolluted region at the periphery of the polluted region; acquiring resistivity data between the two adjacent detection holes and carrying out inversion processing on the resistivity data measured by the detection holes to obtain corresponding resistivity sections; comparing the resistivity data of the polluted regions with the resistivity data of the unpolluted region, wherein the resistivity data of the polluted regions are the resistivity data of the unpolluted region are measured by the detection holes; and meanwhile, judging a pollutant distribution condition in the polluted region through combination of the resistivity section. The polluted soil detection method has the advantages that the acquisition period is relatively short, the investment cost is relatively low, and acquisition labor intensity is greatly alleviated; an acquired result is represented in a planar manner and has great representativeness; and meanwhile, the plurality of sections are crossed so that an underground three-dimensional distribution condition of the pollutants can be judged.
Description
Technical field
The present invention relates to rock and soil engineering detection and field tests, be specifically related to based on the Polluted Soil detection method across hole resistivity CT method.
Background technology
Manufacturing industry scale constantly expands now, and the level of urbanization improves constantly, and social economy obtains flourish.But in scientific and technological level development, while living standards of the people improve, environmental pollution is but day by day serious, serious destruction is caused to the ecosystem, have impact on the quality of life of the mankind, healthy and life activity, and cause a series of social concern, constrain expanding economy.In each large pollution problem, land pollution also becomes comparatively severe problem, wherein occur maximum, endanger maximum kind and have heavy metal, petroleum hydrocarbon, persistence organic pollutant, other industrial chemicals, eutrophic discarded object, radioelement and pathogenic organisms etc.For contaminated soil and place, immediately will make A+E, application detection technique detects contaminated area, the work of carry out assessment, administering and again developing.
Current Domestic is still comparatively single about the detection technique means of Polluted Soil, main dependence detect aperture is got core and is carried out lab analysis to determine pollution level and the approximate range of Polluted Soil, but, the method that detect aperture gets core analysis only can embody the Polluted Soil information of single locus, the collection analysis cycle comparatively grows up to originally higher and limited amount is not representative, has the suspicion of putting general face.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art, provide based on the Polluted Soil detection method across hole resistivity CT method, by gathering, comparing the resistivity in Polluted area and uncontaminated region around thereof, the distribution realizing Polluted area internal contamination thing judges.
The object of the invention realizes being completed by following technical scheme:
Based on the Polluted Soil detection method across hole resistivity CT method, it is characterized in that: in poluted region, arrange the survey line be made up of some detect aperture, at least one end of described survey line is arranged in the uncontaminated region of described Polluted area periphery; Gather the resistivity data between adjacent two described detect aperture, inversion procedure is carried out to resistivity data measured by described detect aperture and obtains corresponding resistivity profile; The resistivity data of the described Polluted area measured by more described detect aperture and the resistivity data in described uncontaminated region, simultaneously in conjunction with described resistivity profile, judge the pollutant distribution situation in described Polluted area.
Pitch of holes between described detect aperture is less than 1/2 of its degree of depth.
The resistivity extracting any level depth direction in described resistivity profile vertically forms the one dimension resistivity curve of this position.
The analysis of many sections combined crosswise is carried out to described resistivity profile, and judges the distribution of pollutant on described Polluted area three dimensions according to the result of combinatory analysis.
Advantage of the present invention is: collection period is shorter, input cost is lower, significantly reduce collection labour intensity, and collection result presents with planar form, have more representativeness, multiple section intersection exists simultaneously, just can judge the distributed in three dimensions situation of pollutant in underground.
Accompanying drawing explanation
Fig. 1 is the first gaging hole arrangement schematic diagram of the present invention;
Fig. 2 is the second gaging hole arrangement schematic diagram of the present invention.
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technician of the same trade:
As shown in Figure 1-2, mark 1-4 in figure to be respectively: Polluted area 1, uncontaminated region 2, detect aperture 3, survey line 4.
Embodiment one: as shown in Figure 1, in contaminated site 1(to be measured encloses) lay some surveys line 4 of multiple detect aperture 3 composition of radial form for initial point with center, place.Keep alignment continuously between each detect aperture 3 on survey line 4 as far as possible, and ensure at least one end of survey line 4, namely at least one detect aperture 4 is arranged in outside uncontaminated region 2(circle), the normal resistance rate background value in the resistivity anomaly value of Polluted area in test result 1 and uncontaminated district 2 is compared, thus determines the actual exact extension of Polluted area 1.
Be placed in two adjacent detect aperture 3 respectively by across hole resistivity CT detecting electrode string, detecting electrode string is made up of some detecting electrodes and cable, and some detecting electrode series connection are formed one by cable.By detecting electrode string gather adjacent two detect aperture 3 hole between resistivity data.After one group of data acquisition, in the same way resistivity data collection between hole is carried out to remaining gaging hole.
The data collected are after corresponding software process, and be stitched together resistivity data between the hole of the detect aperture 3 that every bar survey line 4 is arranged continuously formation continuous print resistivity profile mutually.This section carries out interpretive analysis, between the hole that the in the end inverting of different pollutant types obtains, in resistivity profile, performance characteristic is different, generally, compare with the resistivity normal background value in uncontaminated district 2, heavy metals etc. have inorganic pollutant will present the organic contaminants such as the reflection of relative low-resistance, fertilizer and pesticide and petroleum hydrocarbon will present the reflection of relative high resistant, during judgement, also need comprehensively to analyze according to the resistivity anomaly value size of pollutant in resistivity profile and distributional pattern, infer pollutant type and distribution situation.
Finally the continuous resistance rate section summation in all surveys line 4 is got up to carry out combined crosswise analysis, the distribution situation of pollutant in Polluted area 1 subsurface three-dimensional space can be obtained, and judge the distribution of pollutant on three dimensions.
The resistivity extracting any level depth direction in resistivity profile vertically forms the one dimension resistivity curve of this position, can judge the pollutant distribution on this section place depth direction of Polluted area 1.
Embodiment two: the present embodiment is compared to the difference of embodiment one: as shown in Figure 2, detect aperture 3 in the present embodiment is arranged among Polluted area 1 with crisscross lattice-shaped, so, also the continuous resistance rate section summation in all surveys line 4 can be got up carry out combined crosswise analysis by each, the distribution situation of pollutant in Polluted area 1 subsurface three-dimensional space can be obtained, and judge the distribution of pollutant on three dimensions.
Above-described embodiment is in the specific implementation: the hole depth of each detect aperture 3 need be greater than maximum planned investigation depth (estimating the degree of depth of Polluted area 1 internal contamination thing) about 5m.Owing to laying respectively at emitting electrode in two detect aperture 3 and receiving electrode carries out the transmitting and receiving of electric current with certain angle, the electric current ray pair of mutual oblique will be formed between detect aperture 3, therefore a leg-of-mutton detection blind area can all be formed in the upper and lower certain distance between the hole that obtains of in the end inverting in resistivity profile, i.e. false data, the data section obtained for making detection comprises all effective informations in max survey depth, then the degree of depth of detect aperture 3 need be greater than maximum planned investigation depth certain distance, is generally about 5m.
The pitch of holes of detect aperture 3 need be less than 1/2 of detect aperture 3 degree of depth, and be not more than 8m, if if the pitch of holes of detect aperture 3 is too large, be so positioned at propagation of electrical signals that the emitting electrode among detect aperture 3 sends apart from too far away, receiving electrode cannot receive useful signal, affect last result of detection.Two adjacent detect aperture 3 are placed in respectively by across hole resistivity CT detecting electrode string, detecting electrode string bottom counterweight is to guarantee that cable vertically and stretching, extension naturally, spread of electrodes in detecting electrode string selects 0.2m, 0.5m or 1.0m according to the detect aperture degree of depth, in electrode array, number of poles is certain, the size of spread of electrodes is directly proportional to the detection degree of depth, the degree of depth of detection is larger, then spread of electrodes is larger.
For guaranteeing the resistivity information collecting Polluted area 1 shallow-layer part, need guarantee that active electrode near earth's surface is in the position flushed with earth's surface.Near detect aperture 3, squeeze into two timbers simultaneously, by arranging that one end of appropriate detecting electrode string is fixed on timber, guaranteeing that in testing process, detection streamer is not subjected to displacement, and affecting the accuracy of testing result.
Before implementing acquisition operations, for ensureing that transmitting and receiving electrode can transmit and receive electric signal preferably, and good Detection results, increase the electric conductivity on stratum, need to water filling in detect aperture 3 until water level flushes with ground, if water level can not keep stable, then need to regulate rate of water injection to maintain water level.
Claims (4)
1. based on the Polluted Soil detection method across hole resistivity CT method, it is characterized in that: in poluted region, arrange the survey line be made up of some detect aperture, at least one end of described survey line is arranged in the uncontaminated region of described Polluted area periphery; Gather the resistivity data between adjacent two described detect aperture, inversion procedure is carried out to resistivity data measured by described detect aperture and obtains corresponding resistivity profile; The resistivity data of the described Polluted area measured by more described detect aperture and the resistivity data in described uncontaminated region, simultaneously in conjunction with described resistivity profile, judge the pollutant distribution situation in described Polluted area.
2. according to claim 1 a kind of based on the Polluted Soil detection method across hole resistivity CT method, it is characterized in that: the pitch of holes between described detect aperture is less than 1/2 of its degree of depth.
3. according to claim 1 a kind of based on the Polluted Soil detection method across hole resistivity CT method, it is characterized in that: the resistivity extracting any level depth direction in described resistivity profile vertically forms the one dimension resistivity curve of this position.
4. according to claim 1 a kind of based on the Polluted Soil detection method across hole resistivity CT method, it is characterized in that: the analysis of many sections combined crosswise is carried out to described resistivity profile, and judge the distribution of pollutant on described Polluted area three dimensions according to the result of combinatory analysis.
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Cited By (7)
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| CN106706715A (en) * | 2016-12-26 | 2017-05-24 | 上海岩土工程勘察设计研究院有限公司 | Polluted soil detection method based on three-dimensional high-density electrical resistivity method |
| CN106838630A (en) * | 2016-12-26 | 2017-06-13 | 上海岩土工程勘察设计研究院有限公司 | A kind of method for large-scale draining pipe culvert leak detection |
| CN108845359A (en) * | 2018-06-25 | 2018-11-20 | 桂林理工大学 | The blocking in-situ monitoring method of enclosure wall insertion monitoring electrode |
| CN108980636A (en) * | 2018-07-02 | 2018-12-11 | 中国海洋大学 | Reserve underground leakage method of real-time |
| CN109283225A (en) * | 2018-11-14 | 2019-01-29 | 武汉中地大环境地质研究院有限公司 | A kind of refuse landfill pollutant diffusion monitoring device based on resistivity CT imaging |
| CN113899811A (en) * | 2021-09-29 | 2022-01-07 | 安徽理工大学 | Sound wave method test system for accumulative damage of coal mine tunnel rock mass |
| CN115420778A (en) * | 2022-09-02 | 2022-12-02 | 北京建工环境修复股份有限公司 | Method and system for quickly investigating and positioning shallow soil pollution |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706715A (en) * | 2016-12-26 | 2017-05-24 | 上海岩土工程勘察设计研究院有限公司 | Polluted soil detection method based on three-dimensional high-density electrical resistivity method |
| CN106838630A (en) * | 2016-12-26 | 2017-06-13 | 上海岩土工程勘察设计研究院有限公司 | A kind of method for large-scale draining pipe culvert leak detection |
| CN106838630B (en) * | 2016-12-26 | 2021-11-26 | 上海勘察设计研究院(集团)有限公司 | Method for detecting leakage of large-scale drainage pipe culvert |
| CN108845359A (en) * | 2018-06-25 | 2018-11-20 | 桂林理工大学 | The blocking in-situ monitoring method of enclosure wall insertion monitoring electrode |
| CN108980636A (en) * | 2018-07-02 | 2018-12-11 | 中国海洋大学 | Reserve underground leakage method of real-time |
| CN109283225A (en) * | 2018-11-14 | 2019-01-29 | 武汉中地大环境地质研究院有限公司 | A kind of refuse landfill pollutant diffusion monitoring device based on resistivity CT imaging |
| CN113899811A (en) * | 2021-09-29 | 2022-01-07 | 安徽理工大学 | Sound wave method test system for accumulative damage of coal mine tunnel rock mass |
| CN113899811B (en) * | 2021-09-29 | 2023-12-05 | 安徽理工大学 | Acoustic method test system for accumulated damage of rock mass of coal mine tunnel |
| CN115420778A (en) * | 2022-09-02 | 2022-12-02 | 北京建工环境修复股份有限公司 | Method and system for quickly investigating and positioning shallow soil pollution |
| CN115420778B (en) * | 2022-09-02 | 2023-11-03 | 北京建工环境修复股份有限公司 | Quick investigation and positioning method and system for shallow soil pollution |
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Inventor after: Huang Yongjin Inventor after: Xu Liping Inventor after: Hu Rao Inventor after: Xin Wei Inventor after: Zhu Liming Inventor after: Wang Shuiqiang Inventor after: Yin Xirong Inventor after: Wu Feng Inventor after: Li Fengsheng Inventor before: Hu Rao Inventor before: Huang Yongjin Inventor before: Zhu Liming Inventor before: Jia Zhaolei Inventor before: Yin Xirong Inventor before: Li Tao |
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