CN104142522B - A kind of detection method of city buried faults - Google Patents

A kind of detection method of city buried faults Download PDF

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CN104142522B
CN104142522B CN201310172868.5A CN201310172868A CN104142522B CN 104142522 B CN104142522 B CN 104142522B CN 201310172868 A CN201310172868 A CN 201310172868A CN 104142522 B CN104142522 B CN 104142522B
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resistivity
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CN104142522A (en
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吴曲波
徐贵来
柯丹
潘自强
马娇
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Beijing Research Institute of Uranium Geology
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Beijing Research Institute of Uranium Geology
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Abstract

The present invention relates to a kind of detection method of city buried faults, includes successively：Carry out soil radon measurement method；Carry out high-density electric；Carry out seismic surface wave method；Using radon survey data, the section that anomaly contrast reaches more than 2.0 is extracted, judges the section for exceptions area；Using seismic surface wave measurement data, in low velocity section, when Poisson's ratio reaches more than 0.4, judge the section for exceptions area；Using high density electric survey data, in low-resistivity section, transversely contrast, when the ratio of low-resistivity value and the peak of shoulder-bed resistivity (SBR) is below 0.2, judge the section for exceptions area；When three exceptions areas overlap or partially overlap, judge that there is rift structure more than 90% at the overlapping positions.The present invention can fast, economical effectively detect city buried faults, be that the engineering construction in urban construction and disaster prevention provide reference frame.

Description

A kind of detection method of city buried faults
Technical field
The present invention relates to a kind of detection method of city buried faults, more particularly to one kind quickly can effectively detect city The locus of city's buried faults and the detection method of the city buried faults of occurrence.
Background technology
The person and property safety of urbanite in city buried faults serious harm, because receiving city interference effect serious, It is very big that City Fault detects difficulty.Conventional method for surveying such as GPR method and electromagnetic method can be subject to city electrical interference；It is shallow Layer earthquake rule can be disturbed by City Humanities, while destroying urban architecture facility.And high-density electric belongs to self-powered method Electrical interference, and gathered data can be overcome to greatest extent to contain much information, while high-density electric effectively can be looked into using electrical property difference Pass judgement and split geological information；Seismic surface wave method takes hammering epicenter excitation, can avoid external shock interference, and seismic surface wave as far as possible Method is very sensitive to the positional information for rupturing, while urban architecture facility is not destroyed and affected；Radon survey method belongs to certainly Main pumping measuring method is little by ectocine and very sensitive to shallow faults message reflection.Therefore a kind of combination of offer is provided badly The detection method of the city buried faults of three kinds of method advantages.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of 3 kinds of joint and detects measuring method advantage, accurately and fast, Jing Ji, nondestructively detect rift structure position and occurrence city buried faults detection method.
To solve above-mentioned technical problem, a kind of detection method of city buried faults of the invention is comprised the following steps successively：
（1）Arrangement measurement section is moved towards along perpendicular to buried faults that may be present；
（2）Soil radon measurement method is carried out, and measuring point exceptional value a is obtained with measurement background value lower limit b；
（3）Carry out high-density electric；
（4）Carry out seismic surface wave method；
（5）Using radon survey data, profile anomaly contrast C=a/b is obtained；Extract the area that anomaly contrast reaches more than 2.0 Section, judges the section for exceptions area；
（6）Using seismic surface wave measurement data, inverting underground surface wave speed profile figure, velocity of longitudinal wave V is obtainedmpAnd horizontal stroke Wave velocity Vms；Obtain Poisson's ratio μd；
In low velocity section, when Poisson's ratio reaches more than 0.4, judge the section for exceptions area；
（7）Using high density electric survey data, inverting subsurface resistivity profile, in low-resistivity section, transversely Contrast, when the ratio of low-resistivity value and the peak of shoulder-bed resistivity (SBR) is below 0.2, judges the section for exceptions area；
（8）Work as step（5）、（6）、（7）In three exceptions areas overlap or partially overlap, judge exist at the overlapping positions The probability of rift structure is more than 90%；
Work as step（5）、（6）、（7）In two exceptions areas overlap or partially overlap, judge to exist at the overlapping positions disconnected The probability of construction is split more than 40%.
The determination methods of low velocity section or low-resistivity section are：
Whole speed Value Data or resistivity value data are x1,x2........xN, N be whole data amount check, its averageThe mean square deviation of whole dataTake certain sector data y in section1, y2........yM, M be the sector data number, its averageThe mean square deviation of the sector data isWhen β is less than α, and (alpha-beta)>20% × α, andThen judge the section for low speed Degree section or low-resistivity section.
Soil radon measurement parameter is：Pumping 50～70cm of depth, using 1m～2m points away from pumping number of times adopts 4～5 Secondary, each pumpdown time is more than 5 minutes, and control pumping humidity is within 10%；When finally, the error of measured value is more than twice 10%, then measurement is evacuated next time, measurement result takes last time measured value.
High density electric survey parameter is：Measuring electrode uses unpolarizable electrode, and road spacing adopts 1m～2m, whole to arrange 60～100 road electrodes, section 59～198m of spread length, measurement apparatus type use Dipole-Dipole Array type, spot measurement 1～2s of time, measure the cycle 1～3.
Seismic surface wave method measurement parameter is：Focus is hammered into shape using 8～12 pound weights, and cymoscope frequency selects 4～10Hz, offset distance Using 4～10m, away from 1m～2m, whole arrangement is using 12～24 road cymoscopes, 11～46m of spread length, sample rate for cymoscope point 0.125ms～0.25ms, record length 0.25s～0.5s；Once excite after being measured, be moved along 1～2 geophone station, Until profile survey is finished.
The present invention is detected to city buried faults, using soil radon measurement method, seismic surface wave method and high density electricity Three kinds of exploitation methods of method combine, and City Humanities can be overcome to disturb, quick Jing on the premise of urban infrastructure is not destroyed Ji effectively detects city buried faults, is that the engineering construction in urban construction and disaster prevention provide reference frame.
Specific embodiment
The present invention measures same geologic section, foundation jointly using high-density electric, seismic surface wave method and radon survey method Electrical, the elastic and radiation characteristics of geologic body, integrated prospecting section rift structure information.3 kinds of measuring methods of joint can take length Mend short formation to make a concerted effort, reach accurately and fast, purpose that is economic, nondestructively detecting rift structure position and occurrence.
Specifically, comprise the following steps successively：
（1）Arrangement measurement section is moved towards along perpendicular to buried faults that may be present；
（2）Soil radon measurement method is carried out, and measuring point exceptional value a is obtained with measurement background value lower limit b；
Soil radon measurement parameter is：Pumping 50～70cm of depth, using 1m～2m points away from pumping number of times adopts 4～5 Secondary, each pumpdown time is more than 5 minutes, and control pumping humidity is within 10%；When finally, the error of measured value is more than twice 10%, then measurement is evacuated next time, measurement result takes last time measured value；
（3）Carry out high-density electric；
High density electric survey parameter is：Measuring electrode uses unpolarizable electrode, and road spacing adopts 1m～2m, whole to arrange 60～100 road electrodes, section 59～198m of spread length（Determined by electrode road number）, measurement apparatus type uses dipole-dipole Type of device, 1～2s of spot measurement time, measure the cycle 1～3；According to section spread length and measurement length profile（That is work Make task）, the work of reasonable Arrangement high-density electric.Such as, section spread length is 100m, and measurement length profile is 1000m, then Need to carry out 9 high density electric surveys just complete entirely to measure the detection of section（Work in 100m-200m sections for the first time, Work in 200m-300m sections for second, work in 300m-400m sections for the third time ... ... .... the 9th time in 900m-1000m Section work.）
（4）Carry out seismic surface wave method；
Seismic surface wave method measurement parameter is：Focus is hammered into shape using 8～12 pound weights, and cymoscope frequency selects 4～10Hz, offset distance Using 4～10m, away from 1m～2m, whole arrangement is using 12～24 road cymoscopes, 11～46m of spread length, sample rate for cymoscope point 0.125ms～0.25ms, record length 0.25s～0.5s；Once excite after being measured, be moved along 1～2 geophone station, Until profile survey is finished；
（5）Using radon survey data, profile anomaly contrast C=a/b is obtained；Extract the area that anomaly contrast reaches more than 2.0 Section, judges the section for exceptions area；
（6）Using seismic surface wave measurement data, inverting underground surface wave speed profile figure, velocity of longitudinal wave V is obtainedmpAnd horizontal stroke Wave velocity Vms；Obtain Poisson's ratio μd；
In low velocity section, when Poisson's ratio reaches more than 0.4, judge the section for exceptions area；
（7）Using high density electric survey data, inverting subsurface resistivity profile, in low-resistivity section, transversely Contrast, when the ratio of low-resistivity value and the peak of shoulder-bed resistivity (SBR) is below 0.2, judges the section for exceptions area；
The definition of low velocity section or low-resistivity section is：
Whole speed Value Data or resistivity value data are x1,x2........xN, N be whole data amount check, its averageThe mean square deviation of whole dataTake certain sector data y in section1, y2........yM, M be the sector data number, its averageThe mean square deviation of the sector data isWhen β is less than α, and (alpha-beta)>20%×α；AndThen judge the section for low speed Degree section or low-resistivity section.
（8）Work as step（5）、（6）、（7）In three exceptions areas overlap or partially overlap, judge exist at the overlapping positions The probability of rift structure is more than 90%；
Work as step（5）、（6）、（7）In two exceptions areas overlap or partially overlap, judge to exist at the overlapping positions disconnected The probability of construction is split more than 40%；
And the exceptions area of each method Measurement results all there may be rift structure, need to draw attention.And can basis The occurrence of the extension morphological assessment fracture of the low velocity area of seismic surface wave achievement and the low resistivity region of high-density electric achievement is special Levy.

Claims (4)

1. a kind of detection method of city buried faults, is comprised the following steps successively：
(1) arrangement measurement section is moved towards along perpendicular to buried faults that may be present；
(2) soil radon measurement method is carried out, measuring point exceptional value a is obtained with measurement background value lower limit b；
(3) carry out high-density electric；
(4) carry out seismic surface wave method；
(5) using radon survey data, obtain profile anomaly contrast C=a/b；The section that anomaly contrast reaches more than 2.0 is extracted, Judge the section for exceptions area；
(6) using seismic surface wave measurement data, inverting underground surface wave speed profile figure obtains velocity of longitudinal wave VmpWith shear wave speed Degree Vms；Obtain Poisson's ratio μd；
μ d = V m p 2 - 2 V m s 2 2 ( V m p 2 - V m s 2 ) ;
In low velocity section, when Poisson's ratio reaches more than 0.4, judge the section for exceptions area；
(7) using high density electric survey data, inverting subsurface resistivity profile, in low-resistivity section, is transversely contrasted, When the ratio of low-resistivity value and the peak of shoulder-bed resistivity (SBR) is below 0.2, judge the section for exceptions area；
(8) when three exceptions areas in step (5), (6), (7) overlap or partially overlap, judge at the overlapping positions, there is fracture The probability of construction is more than 90%；
When two exceptions areas in step (5), (6), (7) overlap or partially overlap, judge at the overlapping positions, there is fracture structure The probability made is more than 40%；
It is characterized in that：The determination methods of the low velocity section or low-resistivity section are：
Whole speed Value Data or resistivity value data are x1,x2........xN, N be whole data amount check, its averageThe mean square deviation of whole dataTake certain sector data y in section1, y2........yM, M be the sector data number, its averageThe mean square deviation of the sector data isWhen β is less than α, and (alpha-beta) 20% × α of ＞, andThen judge the section for low Speed sectors or low-resistivity section.
2. the detection method of a kind of city buried faults according to claim 1, it is characterised in that：Soil radon measurement is joined Number is：Pumping 50～70cm of depth, using 1m～2m points away from pumping number of times is adopted 4～5 times, and each pumpdown time is more than 5 points Clock, and control pumping humidity is within 10%；When finally, the error of measured value is more than 10% twice, then be evacuated survey next time Amount, measurement result take last time measured value.
3. the detection method of a kind of city buried faults according to claim 1, it is characterised in that：High density electric survey Parameter is：Measuring electrode uses unpolarizable electrode, road spacing to adopt 1m～2m, entirely arranges 60～100 road electrodes, section arrangement 59～198m of length, measurement apparatus type use Dipole-Dipole Array type, 1～2s of spot measurement time, measure the cycle 1～3 It is individual.
4. the detection method of a kind of city buried faults according to claim 1, it is characterised in that：Seismic surface wave method is measured Parameter is：Focus using 8～12 pound weights hammer into shape, cymoscope frequency select 4～10Hz, offset distance use 4～10m, cymoscope point away from 1m～2m, whole arrangement is using 12～24 road cymoscopes, 11～46m of spread length, sample rate 0.125ms～0.25ms, record Length 0.25s～0.5s；Once excite after being measured, be moved along 1～2 geophone station, until profile survey is finished.
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CN106291718A (en) * 2016-08-30 2017-01-04 中国电建集团贵阳勘测设计研究院有限公司 Unpolarizable electrode inlayed by a kind of high energy excitation polarization CAVE DETECTION method and high-strength copper pottery
CN109738947B (en) * 2018-12-12 2020-11-20 核工业北京地质研究院 Physicochemical exploration combination method for ore exploration scenic spot of confined sandstone type uranium deposit
CN111551997A (en) * 2020-03-12 2020-08-18 上海环联生态科技有限公司 Investigation system and investigation method for concealed fracture layer
CN115346342B (en) * 2022-08-12 2023-12-12 骄鹏科技(北京)有限公司 Urban roadbed detection method and device and electronic equipment

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