CN102071661A - Magnetic prospecting-based erosion monitoring method - Google Patents
Magnetic prospecting-based erosion monitoring method Download PDFInfo
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- CN102071661A CN102071661A CN 201010623693 CN201010623693A CN102071661A CN 102071661 A CN102071661 A CN 102071661A CN 201010623693 CN201010623693 CN 201010623693 CN 201010623693 A CN201010623693 A CN 201010623693A CN 102071661 A CN102071661 A CN 102071661A
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000012544 monitoring process Methods 0.000 title claims abstract description 35
- 230000003628 erosive effect Effects 0.000 title abstract description 12
- 239000004575 stone Substances 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 239000003302 ferromagnetic material Substances 0.000 claims description 18
- 238000011010 flushing procedure Methods 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000009991 scouring Methods 0.000 claims description 3
- 150000001875 compounds Chemical group 0.000 claims description 2
- 238000005538 encapsulation Methods 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
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- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000013517 stratification Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 239000011083 cement mortar Substances 0.000 description 5
- 230000006378 damage Effects 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 5
- 239000002362 mulch Substances 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
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Abstract
The invention discloses a magnetic prospecting-based erosion monitoring method, which belongs to the technical field of structure safety monitoring. The method is characterized by comprising the following steps of: manufacturing a magnetic erosion sensor with self-sensing features by directly embedding a ferromagnetic substance serving as a sensor element into a natural stone or a concrete precast block and encapsulating the ferromagnetic substance; structuring an erosion monitoring system by compounding the sensor and a magnetometer; when monitoring erosion, prearranging or throwing the magnetic erosion sensor together with protection riprap together in an area of which a structural base is easily eroded; detecting the position change information of the magnetic erosion sensor by adopting the magnetometer; and monitoring the erosion state of the structural base in real time. The method has an effect and an advantage of avoiding an influence on structure erosion monitoring caused by severe environmental factors such as silt stratification thickness, flood and the like, and has the outstanding advantages that the method is simple in operation, the test precision is high, the performance is stable and the like, and can be widely used in structure erosion monitoring and protection of major projects such as reservoir dams, river dikes, bridge and ocean platforms and the like.
Description
Technical field
The invention belongs to the structural safety monitoring technical field, relate to a kind of civil engineering structure scour monitoring method based on magnetic prospecting.
Background technology
Washing away is one of major reason of Important Project structural deteriorations such as reservoir dam, River Embankment and bridge and ocean platform.Flood is the disaster that harm is maximum in China's natural calamity, loss is the most serious.As the important component part of flood-prevention project system, the safe condition direct relation of reservoir dam and river embarkment project line of project the people's lives and property safety and national economic development and social stability.Yet; because the restriction of nature, society and economic condition; the existing reservoir dam of China and river embarkment project still exist dam/levee foundation condition poor, build to banket and expect shortcomings such as wretched insufficiency, mulch root stoneledge degree deficiency and the degree of depth be inhomogeneous; current particularly under the flood erosion effect through regular meeting's spot base soil or a large amount of leakages of mulch root stone; cause reservoir dam and dangerous situations such as channel protection engineering generation seepage, landslide and collapse on the bank, severe patient causes the dykes and dams accident of bursting.In addition, the current scour effect is also having a strong impact on bridge and the isostructural safety of ocean platform, in 30 years, the nearly 60% bridge collapse accident of the U.S. causes owing to bridge pier washes away, and need expend nearly 5,000 ten thousand dollars of reparation and maintenances that are used for highway bridge flood erosion damage every year in the past.Given this, develop reliable scour monitoring method and in time grasp Important Project structures such as reservoir dam, River Embankment and bridge and ocean platform and wash away and safe condition, become the structural safety monitoring field and needed one of important engineering problem of solution badly.
At present scour monitoring method mainly contains noncontact Detection Techniques such as contact Detection Techniques such as plummet probing, the spy of artificial awl and sonar, geological radar, dc resistivity, but all there is significant limitation in these Detection Techniques: contact Detection Techniques such as traditional plummet probing and the spy of artificial awl exist that manpower and materials are wasteful, result of detection is subject to shortcomings such as survey crew quality influence, particularly operation at sea causes very big threat to the safety of survey crew, is difficult to satisfy the flushing monitoring demand under the flood state; Though and contactless Detection Techniques installation testings such as modern sonar, radar and dc resistivity are easy, manpower and materials expend little, but its test result is difficult to extract, particularly its test result is subject to influence such as mud and fragment in the current, is difficult to satisfy the steady testing demand in the flood damage environment.Therefore, flushing monitoring is needed reliable and stable detection means badly.
Magnetic prospecting is the important technical of geophysical investigation, its basic principle is to adopt magnetometer that the earth's magnetic field that the magnetic-bearing mineral geologic body causes is measured unusually, by magnetic contrast and the earth's magnetic field off-note of analyzing all kinds of rocks, ore, thereby determine the geologic body of magnetic-bearing mineral or locus and the geometry that detected object exists.Because the restriction of magnetometer measuring accuracy, the application of magnetic prospecting mainly is confined to mineral resources exploration at first, oil gas field is reconnoitred and the field of detecting of large-scale geologic body such as surface geology investigation.Be accompanied by the renewal of magnetometer and the raising of measuring accuracy, particularly proton magnetometer and optical pumped magnetometer emerges, the magnetic prospecting technology is expanded to engineering applications such as the bomb that do not explode, land mine, submarine mine, Watership Down and underground utilities detection gradually from the large-scale geology physical prospecting of tradition field, and has embodied simple to operate, outstanding advantage such as measuring accuracy is high, stable and reliable for performance, test result is subjected to silt depth and flood influence is little.The common trait that above-mentioned magnetic prospecting technology is used is that the locus and the geometry that are detected object are changeless, in the actual detection, survey the earth's magnetic field anomaly intensity that is detected object zone of living in by mobile magnetometer position, thereby inverting determines to be detected the locus and the geometry of object, does not still adopt the magnetic prospecting technology to survey, determine the relevant report of mobile measurand locus and geometry aspect; And the key character that Important Project structures such as reservoir dam, River Embankment and bridge and ocean platform are washed away is that architecture basics foundation soil or mulch root stone constantly run off in the current scour effect, and promptly the locus changes.Given this, the present invention is based on magnetic prospecting technology basic principle, make up the method that the magnetic prospecting technical testing moves the measurand spatial position change, provide a cover reliable and stable flushing monitoring technology.
Summary of the invention
The object of the present invention is to provide a kind of have simple to operate, measuring accuracy is high, the scour monitoring method based on magnetic prospecting of advantage such as stable and reliable for performance, has solved structure flushing monitoring means problem in the adverse circumstances such as flood damage.
Technical scheme of the present invention is: directly adopts ferromagnetic material to imbed the encapsulation of blocks of natural stone or concrete precast block and makes magnetic method scour sensor with self-sensing properties as sensing element, and with the sensor and the compound structure flushing monitoring of magnetometer system.During flushing monitoring, reservoir dam, River Embankment and bridge with Important Project architecture basics such as ocean platform easily wash away the zone in advance cloth if with scour protection jackstone throwing magnetic method scour sensor, adopt magnetometer to survey magnetic method scour sensor position and change information, in real time monitoring of structures foundation scouring state.The ferromagnetic material sensing element adopts a kind of in magnetic patch or the iron block.
Operating principle of the present invention is: cloth if throwing at reservoir dam, Important Project architecture basics such as River Embankment and bridge and ocean platform easily wash away the magnetic method scour sensor in zone, the ferromagnetic material sensing element that its inside is imbedded will be unusual in earth's magnetic field of excitation, place, magnetic method scour sensor present position, under the current scour effect, along with moving of magnetic method scour sensor, imbedding the earth's magnetic field anomaly intensity that the ferromagnetic material sensing element encouraged will change, change by magnetometer real-time detection earth's magnetic field anomaly intensity, thereby inverting obtains the positional information of magnetic method scour sensor.
The present invention is after the ferromagnetic material sensing element is imbedded blocks of natural stone or concrete precast block; adopt epoxy resin or cement mortar that the ferromagnetic material sensing element is carried out packaging protection; improve ferromagnetic material sensing element waterproof, corrosion resistant and endurance quality, to adapt to abominable Service Environment midium or long term steady testing demands such as Important Project structure extensive style construction such as reservoir dam, River Embankment and bridge and ocean platform and flood damage.
Effect of the present invention and benefit are directly to adopt ferromagnetic material as sensing element and blocks of natural stone or concrete precast block produced with combination magnetic method scour sensor, it is simple to have given full play to the magnetic prospecting technical operation, the measuring accuracy height, stable and reliable for performance, test result is subjected to outstanding advantages such as silt depth and flood influence be little, had both reservoir dam simultaneously, the scour protection function of Important Project architecture basics such as River Embankment and bridge and ocean platform protection jackstone can be widely used in reservoir dam, among Important Project structure flushing monitorings such as River Embankment and bridge and ocean platform and the protection.
Description of drawings
Accompanying drawing 1 is a magnetic method scour sensor structural representation of the present invention.
Among the figure: 1 blocks of natural stone or concrete precast block; 2 ferromagnetic materials; 3 cement mortar or epoxy resin.
Accompanying drawing 2 is that the scour monitoring method based on magnetic prospecting of the present invention is implemented schematic diagram.
Among the figure: (a) elevation; (b) vertical view.
The specific embodiment
Be described in detail specific embodiments of the invention below in conjunction with technical scheme and accompanying drawing.
Magnetic method scour sensor structure construction as shown in Figure 1, this sensor comprises 1 blocks of natural stone or concrete precast block; 2 ferromagnetic materials and 3 cement mortar or epoxy resin.Connection and preparation method between each parts of magnetic method scour sensor are: at first according to concrete measuring distance and accuracy requirement, shape and the size determining blocks of natural stone or concrete precast block and imbed ferromagnetic material, ferromagnetic material are a kind of in magnetic patch or the iron block; Afterwards, make blocks of natural stone or concrete precast block, and big at blocks of natural stone or concrete precast block surface cleaved surface opening, the notch cuttype groove that inside opening is little, concrete precast block also can adopt grinding tool to build shaping notch cuttype groove in advance, and it is coarse simultaneously notch cuttype to be polished; Then, ferromagnetic material is put into notch cuttype groove bottommost, and adopt remodeling acrylate adhesive (AB glue) to fix its position; At last, adopt epoxy resin or cement mortar that ferromagnetic material is carried out seal protection, epoxy resin or cement mortar are filled up whole step trough.
At bridge foundation flushing monitoring problem, Fig. 2 has provided the embodiment based on the scour monitoring method of magnetic prospecting, and its concrete laying with method of testing is:
At first, wash away feature according to bridge foundation, determine that bridge foundation easily washes away the zone, and in easily washing away the zone, vertically reach in the horizontal plane in advance cloth if with bridge foundation mulch jackstone throwing magnetic method scour sensor, as Fig. 2 (a) with (b) along bridge foundation.The concrete installation position and the quantity of magnetic method scour sensor are determined according to actual testing requirement.
Bridge foundation suffers current scour to do the time spent, and the position of magnetic method scour sensor will change along with the loss of bridge foundation foundation soil or mulch jackstone, thereby causes that the earth's magnetic field anomaly intensity of imbedding the ferromagnetic material excitation changes.During flushing monitoring, adopt magnetometer real-time detection earth's magnetic field anomaly intensity variation delta T
i, determine that respectively cloth is if the position change amount Δ R of the magnetic method scour sensor of throwing in advance:
In the formula, R
I0For each in advance cloth if the magnetic method scour sensor of throwing and the initial distance between the magnetometer, m
iBe the corresponding magnetic moment of imbedding ferromagnetic material.
Afterwards, according to the change in location Δ R of magnetic method scour sensor
iAnd concrete cloth is if width and scour depth that bridge foundation washes away are determined, the safe condition of bridge under the assay souring in the throwing position:
Under the normal mode of occupation, the verification coefficient is less than 1 and more little safe more; When the verification coefficient near or more than or equal to 1 the time, think that bridge foundation washes away and reached ultimate limit state.
Claims (4)
1. based on the scour monitoring method of magnetic prospecting, it is characterized in that: directly adopt ferromagnetic material (2) to imbed the encapsulation of blocks of natural stone or concrete precast block (1) and make magnetic method scour sensor with self-sensing properties as sensing element, and with the sensor and the compound structure flushing monitoring of magnetometer system; During flushing monitoring, cloth is if with scour protection jackstone throwing magnetic method scour sensor in advance easily to wash away the zone at architecture basics, and the position of adopting magnetometer to survey the magnetic method scour sensor changes information, in real time monitoring of structures foundation scouring state.
2. the scour monitoring method based on magnetic prospecting according to claim 1 is characterized in that: described ferromagnetic material (2), and a kind of in iron block or the magnetic patch, its shape and size are determined according to concrete engineering test distance and measuring accuracy demand.
3. the scour monitoring method based on magnetic prospecting according to claim 1 is characterized in that: described magnetic method scour sensor cloth if throwing position and structure easily to wash away the zone corresponding, its quantity is definite by the test request of concrete engineering.
4. the scour monitoring method based on magnetic prospecting according to claim 1 is characterized in that: adopt magnetic method scour sensor position monitoring information, evaluation structure foundation scouring and safe condition.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010623693 CN102071661A (en) | 2010-12-29 | 2010-12-29 | Magnetic prospecting-based erosion monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010623693 CN102071661A (en) | 2010-12-29 | 2010-12-29 | Magnetic prospecting-based erosion monitoring method |
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| CN102071661A true CN102071661A (en) | 2011-05-25 |
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| CN 201010623693 Pending CN102071661A (en) | 2010-12-29 | 2010-12-29 | Magnetic prospecting-based erosion monitoring method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105040747A (en) * | 2015-04-21 | 2015-11-11 | 浙江大学 | Real-time monitoring device and method for scouring test on local of pile structure |
| CN105352545A (en) * | 2015-10-27 | 2016-02-24 | 西南大学 | Bridge pier scouring whole-process evolution dynamic monitoring system and monitoring method |
| CN108755786A (en) * | 2018-05-31 | 2018-11-06 | 湖南工程学院 | A kind of flushing monitoring device of offshore wind farm pile foundation |
| CN109780989A (en) * | 2019-03-06 | 2019-05-21 | 西南大学 | Based on the bridge scouring monitoring system and monitoring method for becoming baseline and magnetic field gradient |
| CN109883454A (en) * | 2019-04-16 | 2019-06-14 | 山东大学 | A kind of magnetic-label sensor and preparation method thereof and channel scour detection device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417594A (en) * | 2001-11-08 | 2003-05-14 | 阎嘉义 | Soil layer scour monitoring method and system |
| CN101603946A (en) * | 2009-07-14 | 2009-12-16 | 中国科学院水利部成都山地灾害与环境研究所 | Tillage erosion measurement magnetism tracer method |
-
2010
- 2010-12-29 CN CN 201010623693 patent/CN102071661A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417594A (en) * | 2001-11-08 | 2003-05-14 | 阎嘉义 | Soil layer scour monitoring method and system |
| CN101603946A (en) * | 2009-07-14 | 2009-12-16 | 中国科学院水利部成都山地灾害与环境研究所 | Tillage erosion measurement magnetism tracer method |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105040747A (en) * | 2015-04-21 | 2015-11-11 | 浙江大学 | Real-time monitoring device and method for scouring test on local of pile structure |
| CN105352545A (en) * | 2015-10-27 | 2016-02-24 | 西南大学 | Bridge pier scouring whole-process evolution dynamic monitoring system and monitoring method |
| CN105352545B (en) * | 2015-10-27 | 2017-12-05 | 西南大学 | Pier subsidence overall process Evolution dynamics monitoring system and monitoring method |
| CN108755786A (en) * | 2018-05-31 | 2018-11-06 | 湖南工程学院 | A kind of flushing monitoring device of offshore wind farm pile foundation |
| CN109780989A (en) * | 2019-03-06 | 2019-05-21 | 西南大学 | Based on the bridge scouring monitoring system and monitoring method for becoming baseline and magnetic field gradient |
| CN109883454A (en) * | 2019-04-16 | 2019-06-14 | 山东大学 | A kind of magnetic-label sensor and preparation method thereof and channel scour detection device |
| CN109883454B (en) * | 2019-04-16 | 2020-07-31 | 山东大学 | Magnetic label sensor, manufacturing method thereof and riverbed scouring detection device |
| WO2020211208A1 (en) * | 2019-04-16 | 2020-10-22 | 山东大学 | Magnetic tag sensor and manufacturing method therefor, and river bed scouring measurement device |
| US11566882B2 (en) | 2019-04-16 | 2023-01-31 | Shandong University | Magnetic tag sensor and method for manufacturing same, and riverbed scour detection device |
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Application publication date: 20110525 |