CN108535792A - Improve the complex geophysical prospecting computational methods of slip mass detection accuracy - Google Patents
Improve the complex geophysical prospecting computational methods of slip mass detection accuracy Download PDFInfo
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- CN108535792A CN108535792A CN201810341009.7A CN201810341009A CN108535792A CN 108535792 A CN108535792 A CN 108535792A CN 201810341009 A CN201810341009 A CN 201810341009A CN 108535792 A CN108535792 A CN 108535792A
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
Abstract
Improve the complex geophysical prospecting computational methods of slip mass detection accuracy, give full play to the advantage of comprehensive geophysical prospecting methods, the various data in comprehensive geophysical prospecting methods are efficiently used, algorithm is simplified, and then improve the complex geophysical prospecting computational methods of the raising slip mass detection accuracy of slip mass detection accuracy.The complex geophysical prospecting computational methods of the raising slip mass detection accuracy of the present invention, it is characterised in that two explanation parameters, respectively method weight coefficient are arranged in the single interpretation results that the computational methods according to comprehensive geophysical prospecting methods obtain when slip mass detectionkAnd reliability coefficientD, kIt is related to the applicability of geophysical prospecting method,dIt is related to slip mass detection event.The present invention passes through setting method weight coefficientk, landslide body thickness is calculated using method weight coefficient, and the reliability coefficient of method weight coefficient and this method is associated, computational accuracy can be improved, this method principle is simple, is easy to be grasped and used by most of technical staff, algorithm is simplified, and improves computational accuracy.
Description
Technical field
The present invention relates to engineering investigation technical field, specially a kind of advantage giving full play to comprehensive geophysical prospecting methods, effectively
Using the various data in comprehensive geophysical prospecting methods, simplify algorithm, is suitable for most technical staff and uses, and then improve slip mass and visit
Survey the complex geophysical prospecting computational methods of the raising slip mass detection accuracy of precision.
Background technology
It needs to carry out necessary investigation and prospecting before carrying out estimation of stability to slip mass and administering, compared to probing side
Method, geophysical exploration method has easily and efficiently characteristic, also smaller to the perturbation of slip mass, but single physical prospecting
For method since there may be multi-solutions, precision is relatively low, therefore in order to improve the detection accuracy of slip mass, needs using a variety of
The comprehensive geophysical prospecting methods of geophysical prospecting method composition.At present for the Interpretation On The Results of comprehensive geophysical prospecting methods, generally use two ways, one
Kind it is to be explained according to various single geophysical prospecting methods as a result, by artificially qualitatively judging final interpretation results, or carries out simple
Average, this method precision is relatively low；Another kind is joint inversion method, i.e., in Interpretation On The Results, use in conjunction is a variety ofly
Ball physical observation data, by the same underground of correlation joint inversion between the physical properties of rock and geometric parameter of geologic body
Matter, geophysical model, this is the trend of geophysical integration geophysical prospecting method and future, but engineer application is come at present
It says, algorithm is complex, without molding software, therefore the more difficult grasp of general engineers and technicians.It is, thus, sought for one
Kind complex geophysical prospecting means of interpretation, on the one hand gives full play to the advantage of comprehensive geophysical prospecting methods, efficiently uses in comprehensive geophysical prospecting methods
Various data, another aspect algorithm are easier to grasp, and are suitable for most of engineers and technicians and use, to greatly improve slip mass
The precision of detection.
Invention content
To be solved by this invention is exactly that existing Landslide Stability evaluation precision is poor, and algorithm is complicated, and technical staff is difficult to
The problem of grasp, provides a kind of advantage giving full play to comprehensive geophysical prospecting methods, efficiently uses the various numbers in comprehensive geophysical prospecting methods
According to simplified algorithm is suitable for most technical staff and uses, and then improves the raising slip mass detection accuracy of slip mass detection accuracy
Complex geophysical prospecting computational methods.
The present invention raising slip mass detection accuracy complex geophysical prospecting computational methods, it is characterised in that the computational methods according to
Comprehensive geophysical prospecting methods carry out the single interpretation results obtained when slip mass detection, and two explanation parameters are arranged, and respectively method is weighed
Weight coefficientkAnd reliability coefficientD, kIt is related to the applicability of geophysical prospecting method,dRelated to slip mass detection event, specific steps are such as
Under：
1）Determine method weight coefficientk, the applicability that the geophysical prospecting method detects slip mass is theoretically analyzed first, further according to
Effect of the previous such method in slip mass detection determines weight of the geophysical prospecting method in comprehensive geophysical prospecting methods combination,
Value range is 0~1；
2）Determine reliability coefficientd, the reliability coefficient of geophysical prospecting methoddBy the technical merit, experience, in-situ measurement that detect personnel
Condition etc. determines, between value range is 0~1, experience is detected, it is specified that the detection achievement of single geophysical prospecting method can according to slip mass
Coefficient of reliability is not less than 0.85, i.e. d >=0.85；
3）According to reliability coefficient d, method of adjustment weight coefficient k ', adjustment formula is：
…………………………………………………………（1）
Wherein,k’ iTo adjust rear method weight coefficient,k i For original method weighted value,d i For reliability coefficient,iFor geophysical prospecting method
Serial number, i=1,2 ... n；
4）It is calculated according to following formula, you can obtain the explanation results of slip mass：
…………………………………………………………（2）
Wherein,HThe thickness explained for comprehensive geophysical prospecting methods；
h iFor the explanation thickness of i-th kind of geophysical prospecting method；
k’ iFor the weight of i-th kind of geophysical prospecting method, take between 0~1；
Formula（2）Ink’ i The following conditions need to be met：
………………………………………………………………（3）.
The complex geophysical prospecting computational methods of the raising slip mass detection accuracy of the present invention, pass through setting method weight coefficientk, profit
Landslide body thickness is calculated with method weight coefficient, and the reliability coefficient of method weight coefficient and this method is associated, i.e.,
Computational accuracy can be improved, this method principle is simple, is easy to be grasped and used by most of technical staff, simplifies algorithm, and carry
High computational accuracy.
The complex geophysical prospecting computational methods of the raising slip mass detection accuracy of the present invention, pass through setting method weight coefficientk, profit
Landslide body thickness is calculated with method weight coefficient, and the reliability coefficient of method weight coefficient and this method is associated, i.e.,
Computational accuracy can be improved, this method principle is simple, is easy to be grasped and used by most of technical staff, simplifies algorithm, and carry
High computational accuracy.
Description of the drawings
Fig. 1 is that Huang of the present invention steps on power station slip mass Geophysical Work layout drawing.
Fig. 2 is that Huang of the present invention steps on power station CSAMT resistivity profile figures.
Fig. 3 is that Huang of the present invention steps on power station slip mass depth isoline graph.
Fig. 4 is that Huang of the present invention steps on power station slip mass bedrock surface 3 dimensional drawing.
Specific implementation mode
Embodiment 1：It is the 6th step that Lancang River Gu Shui plans section to seedling tail that Huang, which steps on power station,.Dam site is located at Yunnan
The counties Nujiang Prefecture Lan Ping of province military camp town is domestic, 9.19 ten thousand km of dam site water catching area2, average annual flow 892m3/s.It is quasi- to adopt
It is developed with dam-type, chokes water high 158m, normal pool level 1630m, the corresponding long 88km in library, 15.07 hundred million m of storage capacity3, installed capacity
1600MW, just quasi- dam type is Concrete Gravity Arch Dam, and generating system by piloting water, underground power house are arranged in left bank.Huang steps on power station and in advance may be used
The work of Journal of Sex Research stage geological mapping starts from 2 months 2004, on the basis of planning, is selected on the section for be about 17.2km
Ravine dam site is stepped on by Ze Liao sections（Upper dam site）, Huang step on dam site（Middle dam site）, military camp dam site（Lower dam site）Carry out pre feasibility study.Wherein
Ravine dam site is stepped on by section（Upper dam site）The slip mass of left bank 1,2 is one of the Main Engineering Geological Problems for influencing dam safety, for detection
The engineering geological condition of upper Dam Site, finds out form, the thickness etc. of the slip mass of left bank 1,2, geology branch in 2005 5 below the moon
The Huang reached steps on power station pre feasibility study stage physical prospecting charter.According to physical prospecting charter, in conjunction with this scientific research project research
Content, use comprehensive geophysical prospecting methods.
Upper dam site section is about 1.7km, and dam site river valley is V-shaped, and river valley is relatively broad, elevation 1600m or less two
Bank landform is symmetrical and steep, and terrain slope is generally 40o~50o, and part is cliff；The above right banks of elevation 1600m are steep, left bank
It is slow；The bank slope landform smooth-going of Dam Site two sides, complete, coombe agensis.The stratum of dam site exposure be mainly unite on Trias it is small fixed
Western group, system the flowers are in blossom left set hypomere and the 4th system in Jurassic system.Wherein the 4th system（Q）It can be divided by genetic type：Alluvium, slide rock
Layer and is mainly acted on the loose material landslide body formed at avalanche talus by ice water, flood and avalanche.And the loose material landslide body origin cause of formation therein compared with
Complexity, exterior portion is mainly distributed the boulder of avalanche, block stone is caught broken stone matter silt, and lower part is mainly rubble matter silty clay soil fixture block
Stone, it is closely knit, locally see aerial phenomenon in block stone, stone contents higher part position, sees there is the preferable gravel of psephicity in slip mass, but
Fascicule unobvious.No. 1 slip mass and No. 2 landslide body thicknesses are distributed in generally between 20m~70m on the hillside of dam site left bank.
No. 1 slip mass：It is distributed elevation 1480m~1720m, mean breadth about 150m explores the maximum gauge of exposure
40.6m, general thickness are 10m~30m, and about 1,500,000 m measure in geology deduction side3.Before the slip mass is located at dam, from topography and geomorphology
It sees, slope terrain does not come down significantly geomorphic feature, and substance of landslide is rubble matter silt, clay fixture block stone, in block stone
Compared with concentrating position locally to have aerial phenomenon, near Highway, closely apparent fascicule is seen in exterior portion position.
No. 2 slip masses：Upstream portion is distributed elevation 1580m~1810m, and downstream part is distributed elevation 1480m~1750m,
The minimum distribution elevation 1670m of rear reaches 570m, is taken off according to exploration on plan view in " M " shape, No. 2 riverine dispersions of distribution of slip mass
The maximum gauge of dew reaches 68.8m, and general thickness is 20m~50m, and about 6,000,000 m measure in geology deduction side3.The slip mass is distributed in a left side
Dam abutment and left bank cushion pool position, explore the material composition preliminary analysis of exposure from earth's surface and slip mass, earth's surface be distributed with compared with
More boulders acts on being formed for avalanche, but in exploring adit, and substance predominantly contains gravel, rubble silty clay fixture block stone,
It is closely knit, locally see aerial phenomenon in block stone, stone contents higher part position, seeing in slip mass has the preferable gravel of psephicity, hence it is evident that
The effect of water is received, but without apparent fascicule in slip mass.
According to the feature of above 1, No. 2 slip mass it is found that they belong to the loose overhead type slip mass of I classes.
Basalt longitudinal wave velocity is generally in 4.0km/s or more in survey area, and the longitudinal wave velocity of callapsed landslide body changes greatly,
Between 0.8km/s~2.0km/s.The velocity of wave and wave impedance value of basement rock and overlying strata have larger difference, this physical property on stratum
Difference such as velocity of wave, electrical property difference provide advantageous Geophysical Condition to carry out earthquake and CSAMT investigation and prospectings.But it is relatively steep
Orographic condition and dense vegetation, bring larger impact to the explanation of the arrangement and data of field process, be this task
Unfavorable conditions.
Since 1, No. 2 slip mass detected belongs to the loose overhead type slip mass of I classes, and combine specific landform,
Matter condition uses seismic reflectuon seismic noise, CSAMT electromagnetic depth methods, Electromagnetic wave：
1）Seismic prospecting reflective wave method
According to the landform of slip mass, geological conditions and physical property characteristic, when requiring investigation depth to be no more than 80m, using shallow-layer
It is appropriate to shake the thickness of reflective wave method detection slip mass.The reflective wave method Exploration profile that Huang climbs up dam site slip mass arranges altogether
5, section number D1~D5.Wherein, No. 1 slip mass has 1, section D1；No. 2 slip masses 4, section D2, D3, D4
And D5；An expansion arrangement is first arranged at the preferable position of geological conditions at the scene, to choose shallow seismic reflection exploration
Various parameters, finally take offset distance, shot point away from 2m etc. offset alignments, the horizontal superposition observation of six coverings, 100Hz wave detectors
It receives, S-12 type digital seismographs carry out field note；
2）Electromagnetic sounding
The electromagnetic depth method Exploration profile that Huang climbs up dam site slip mass arranges 8 altogether, section number E1~E8.Wherein, wherein
In No. 1 slip mass E1 sections are arranged perpendicular to river direction；No. 2 slip masses perpendicular to river direction arrange E2, E3,
E4, E5 and E6 section；It is parallel to river direction and arranges E7, E8 section；
3）Ground Penetrating Radar method
Ground Penetrating Radar this time arranges that 4 sections are detected altogether, section number R1~R4.Wherein in No. 1 slip mass perpendicular to river
Stream direction arranges R1 sections；In No. 2 slip masses R2, R3, R4 section are arranged perpendicular to river direction；
In the survey line of these arrangements, R2 and D5 surveys line partially overlap, R1 and E1 surveys line partially overlap, D3 and E3 surveys line part weight
It closes, R5 and E6 surveys line partially overlap, D4 and E7 surveys line partially overlap.
It surveys in area and arranges 8 CSAMT sections altogether, it is as follows to a wherein representative section comprehensive analysis：
Huang steps on power station E4 section CSAMT resistivity profiles, the long 250m of this section, and measuring point is numbered from 1000 to 1250, point away from
25m completes measuring point 11 altogether.In inverting sectional view, resistivity from top to bottom becomes larger, because without borehole data, according to
The resistivity isopleth value residing for the bottom interface of slip mass is determined with the intersection point depth of the E7 sections of its intersection, takes 250 Ω m
Slip mass and interface of basement rock resistivity as E4 sections.As seen from the figure, landslide body thickness generally perform for trumpet point it is thin, greatly
Number point thickness, is distributed in the range of 20m to 60m depth.It is worth noting that, the section period 1000 m~1025 m it
Between, for elevation in 1500m or so, there are a low-resistances to react, and it is locally broken aqueous caused that this exception is presumably due to basement rock.
According to mission requirements and actual landform condition, cloth is distinguished along river direction and vertical river direction in No. 2 slip masses
D2, D3 Shallow groundwater resources wave profile are set.It is now as follows to wherein 2 section Analysis on Results：
D2 sections：Time section continuity is preferable, and the lineups that can be tracked along whole section mainly have one, in time cross-section
On, the time of this lineups is between 40ms~85ms.By time and depth transfer, the landslide body thickness of calculating is in 50.8m~93.4m
Between, slip mass thickness change is larger；
D3 sections：Time section continuity is preferable, and the lineups that can be tracked along whole section only have one, in time cross-section
On, the time of this lineups is between 30ms~50ms.By time and depth transfer, the landslide body thickness of calculating is in 43.0m~70.3m
Between, slip mass thickness change is larger.
In terms of above 2 seismic reflection time sections, time section continuity is preferable, the same phase that can be tracked along whole section
Axis only has one.
Now through geophysical profile control and a large amount of exploration data, such slip mass is loose overhead type slip mass, finds out dam
The larger 4th of section distribution, which is loose material landslide body, to be had：The loose material landslide body of upper dam site left bank No. 1, No. 2.The above loose material landslide body
The origin cause of formation is more complex, is collectively formed by a variety of effects such as ice water, flood and avalanche.
The slip mass of upper dam site left bank 1 is distributed elevation 1480m~1720m, mean breadth about 150m, the maximum of physical prospecting detection
Thickness 40.6m, general thickness are 10m~30m.If with long 370m, wide 150m, average thickness 25m are calculated, area 52.5
Ten thousand m2, about 138.8 ten thousand m measure in reckoning side3；No. 2 slip mass upstream portions are distributed elevation 1580m~1810m, and downstream part distribution is high
Journey 1480m~1750m, the minimum distribution elevation about 1670m of rear are in " M " shape, the riverine distribution width of No. 2 slip masses on plan view
Degree reaches 570m, and the maximum gauge that physical prospecting is verified reaches 68.8m, and general thickness is 20m~50m, if with long 410m, wide 390m is calculated,
Average thickness 35m is calculated, and area is 159.9 ten thousand m2, about 559,650,000 m measure in reckoning side3。
1）Determine method weight coefficientkWith determining reliability coefficientd
Constituent, structure, the regularity of distribution and the physical parameter etc. that the slip mass of power station 1,2 is stepped on according to Huang, are classified as I classes
Slip mass.The best comprehensive geophysical prospecting methods for detecting such slip mass are combined as the survey of shallow seismic reflection-CSAMT electromagnetism
Depth-Ground Penetrating Radar, and according to field condition, the weight parameter of various methods is provided, parameter see the table below
2）According to reliability coefficient d, method of adjustment weight coefficient k '：
The new method weight of shallow seismic reflection
The new method weight of CSAMT electromagnetic soundings
The new method weight of Ground Penetrating Radar electromagnetic sounding
4）It is calculated according to thickness formula, obtains the integrated interpretation result of certain section slip mass：
By taking D4 and E7 surveys line as an example, D4 is shallow seismic reflection survey line, and E7 is CSAMT electromagnetic sounding surveys line, two surveys line
It partially overlaps, it is as follows using thickness equations for intersection：
After difference, 410 pile No. of CSAMT electromagnetic soundings survey line landslide body thickness 58.2m, shallow seismic reflection 410
Number landslide body thickness 45.1m, integrated interpretation thickness, but due to meet, D4 and
The part that E7 is overlapped only has two methods, because the method weight needs to adjust again, i.e.,：
The method weight of CSAMT electromagnetic soundings
The method weight of shallow seismic reflection
Then 410 pile No. integrated interpretation thickness,
52.9m is compared compared with the pile No. drills and discloses thickness, and error is substantially reduced compared with single method.
Other measuring points are equally handled, and finally find out the thickness of each measuring point of slip mass（hi）, slip mass body is then calculated again
Product.Comprehensive geophysical prospecting methods interpretation results mainly step on power station slip mass depth isoline graph including Huang and Huang steps on power station slip mass
Bedrock surface 3 dimensional drawing.It is respectively 142.6 ten thousand m to calculate 1, No. 2 accumulation scale3With 588.1 ten thousand m3。
Claims (1)
1. a kind of complex geophysical prospecting computational methods improving slip mass detection accuracy, it is characterised in that the computational methods are according to synthesis
Spy method carries out the single interpretation results obtained when slip mass detection, and two explanation parameters, respectively method weight coefficient are arrangedk
And reliability coefficientD, kIt is related to the applicability of geophysical prospecting method,dIt is related to slip mass detection event, it is as follows：
1）Determine method weight coefficientk, the applicability that the geophysical prospecting method detects slip mass is theoretically analyzed first, further according to
Effect of the previous such method in slip mass detection determines weight of the geophysical prospecting method in comprehensive geophysical prospecting methods combination,
Value range is 0~1；
2）Determine reliability coefficientd, the reliability coefficient of geophysical prospecting methoddBy the technical merit, experience, in-situ measurement that detect personnel
Condition etc. determines, between value range is 0~1, experience is detected, it is specified that the detection achievement of single geophysical prospecting method can according to slip mass
Coefficient of reliability is not less than 0.85, i.e. d >=0.85；
3）According to reliability coefficient d, method of adjustment weight coefficient k ', adjustment formula is：
…………………………………………………………（1）
Wherein,k’ iTo adjust rear method weight coefficient,k i For original method weighted value,d i For reliability coefficient,iFor geophysical prospecting method
Serial number, i=1,2 ... n；
4）It is calculated according to following formula, you can obtain the explanation results of slip mass：
…………………………………………………………（2）
Wherein,HThe thickness explained for comprehensive geophysical prospecting methods；
h iFor the explanation thickness of i-th kind of geophysical prospecting method；
k’ iFor the weight of i-th kind of geophysical prospecting method, take between 0~1；
Formula（2）Ink’ i The following conditions need to be met：
………………………………………………………………（3）.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666614A (en) * | 2021-01-15 | 2021-04-16 | 西南科技大学 | Debris flow source static reserve calculation method based on electrical prospecting and digital elevation model |
| CN113481963A (en) * | 2021-07-09 | 2021-10-08 | 中交第三航务工程勘察设计院有限公司 | Dynamic design-based cooperative construction method for pushing riprap in deep silt base into seawall |
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| KR20150131801A (en) * | 2014-05-16 | 2015-11-25 | 한국지질자원연구원 | Landslide Prediction System using Geographic Information System and NeuroFuzzy techniques and Landslide Prediction Method using Thereof |
| CN106250667A (en) * | 2016-06-29 | 2016-12-21 | 中国地质大学（武汉） | The monitoring method of a kind of landslide transition between states of paddling and device |
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| KR20150131801A (en) * | 2014-05-16 | 2015-11-25 | 한국지질자원연구원 | Landslide Prediction System using Geographic Information System and NeuroFuzzy techniques and Landslide Prediction Method using Thereof |
| CN106250667A (en) * | 2016-06-29 | 2016-12-21 | 中国地质大学（武汉） | The monitoring method of a kind of landslide transition between states of paddling and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666614A (en) * | 2021-01-15 | 2021-04-16 | 西南科技大学 | Debris flow source static reserve calculation method based on electrical prospecting and digital elevation model |
| CN112666614B (en) * | 2021-01-15 | 2022-09-06 | 西南科技大学 | Debris flow source static reserve calculation method based on electrical prospecting and digital elevation model |
| CN113481963A (en) * | 2021-07-09 | 2021-10-08 | 中交第三航务工程勘察设计院有限公司 | Dynamic design-based cooperative construction method for pushing riprap in deep silt base into seawall |
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Application publication date: 20180914 |