CN209372712U - The monitoring device of flush type soil-body landslide - Google Patents
The monitoring device of flush type soil-body landslide Download PDFInfo
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- CN209372712U CN209372712U CN201920088948.5U CN201920088948U CN209372712U CN 209372712 U CN209372712 U CN 209372712U CN 201920088948 U CN201920088948 U CN 201920088948U CN 209372712 U CN209372712 U CN 209372712U
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Abstract
The utility model provides a kind of monitoring device of flush type soil-body landslide, comprising: light source, light power meter, optical fiber and native stick；Optical fiber one end receives the light that light source issues, and the other end is connect with light power meter；The middle section of optical fiber is around in the shape of a spiral on native stick.The utility model indicates light intensity variation monitoring soil mass fragmentation situation by light power meter.Structure is simple, at low cost, can be used as disposable sensor part；It can be used for real-time monitoring；Since sensing unit merges completely with the soil body, it can reflect the soil body to be observed time of day in a natural environment；The present apparatus can be used as a component part of Intelligent optical fiber sensing system；Communication standard fiber optic materials used in sensor are silica, and insulation is not interfered by electromagnetic signal, can bear adverse circumstances, and device is not necessarily to power supply, no electric leakage hidden danger；Optical fiber integrates transducing signal perception and transmission, is easy to integrated with communication network.
Description
Technical field
The utility model relates to a kind of monitoring device of soil-body landslide, in particular to a kind of monitoring of flush type soil-body landslide
Device.
Background technique
China is agricultural production big country, and with the propulsion of agricultural modernization, wisdom agricultural is just gradually applying to more and more
Production in, wherein the monitoring of soil cracking can be used as effective foundation of Monitoring of drought, soil hardening etc..It is raw in existing agricultural
In production, the monitoring of this index is taken time and effort based on artificial observation, is not suitable with the demand of appropriate scale of agriculture production.On the other hand,
In numerous earth structures (such as soil-slope, earth and rockfill dam), the unstable failure of structure is often drawn by the extension of internal fissure
Rise, the monitoring of people's fracture facilitate extension mechanism of the research crack in the soil body and be finally reached to this structural health into
The purpose that row effectively monitors.Currently used method has: asymmetric four-point bending test method, collar plate shape test method(s), short beam are cut
Bad test method(s) and shear box test method etc. are cut through, but since test is in laboratory progress, with earth structure actual environment
It has greater difference.In another aspect, frozen soil area of the China including seasonal frozen ground accounts for the 75% of national area, frozen soil cracking row
For research to the construction of China's cold regions engineering, development of resources, environmental protection and freezing prevention have important meaning, and at present this
A little monitorings also carry out in the lab mostly, and experiment condition must have differences with true environment, cause test result with very
Difference under real state, test method are related to laser speckle photography method or acoustic-emission etc., these methods need expensive precision equipment,
It is at high cost, use complexity.
The soil-body landslide fibre optical sensor having been reported that at present has following two device: flush type soil-body landslide is straightened in 1. optical fiber
Sensor.This sensor makes straight optical fiber that microbending loss occur when passing through soil-body landslide, and then indicates soil-body landslide situation.It is this
Sensor soil-body landslide unconspicuous initial stage and when crack orientation is consistent with optical fiber axial direction it is caused loss it is unobvious, therefore
Sensitivity is not high.The sensor 2. surface mount formula coiling optical fiber cracks.This sensor is by being stained with the soil body of coiled fiber
Optical fiber is pulled when cracking, makes coiled fiber radius change, causes optical power in optical fiber to generate added losses fluctuation, and then monitor it
Crack situation, and this device is there are two disadvantage, 1) can only test surfaces cracking, the cracking of inside soil body cannot be tested；2) only
It is suitable for the soil body that there is section in itself, such as concrete-bridge.For the large area soil body of not section, such as plough, it can not
Suitable sensor mounting location is set.
Utility model content
The utility model provides a kind of monitoring device of flush type soil-body landslide, one of to solve the above problems or
It is several.
One aspect according to the present utility model, provides a kind of monitoring device of flush type soil-body landslide, and feature exists
In, comprising: light source, light power meter, optical fiber and native stick；Optical fiber one end receives the light that light source issues, and the other end and light power meter connect
It connects；The middle section of optical fiber is around on native stick in the shape of a spiral and forms sensing unit.
In some embodiments, the optical fiber of the utility model is single mode optical fiber, and light source is single wavelength light source.Have as a result,
Have the advantages that soil monitoring effect is good.
In some embodiments, the native stick diameter 6mm of the utility model.
In some embodiments, the optical fiber of the utility model is around on native stick with screw pitch 17mm.
In some embodiments, the both ends that the optical fiber of the utility model is contacted with native stick are fixed.
The utility model advantage compared with non-optical fiber micro-bending class sensor:
1. this project is sensing element using common communications standard single-mode fiber, the difference of optical power before and after soil-body landslide is calculated
Value, light source and light power meter required precision be not high, therefore structure is simple, at low cost, can be used as disposable sensor part.
2. can real-time monitoring, and since sensing unit is merged with the soil body completely, test carried out under true environment rather than
Laboratory environment, thus can reflect the time of day of the soil body to be observed in a natural environment.
3. communication standard fiber optic materials used in sensor are silica, insulation is not interfered by electromagnetic signal, can bear to dislike
Bad environment, device are not necessarily to power supply, no electric leakage hidden danger.
4. optical fiber integrates signal perception and transmission, it is easy to integrated with communication network and large-scale optical fiber Sensor Network.
The utility model is cracked with existing optical fiber micro-bending class compared with sensor:
1. the utility model uses prebuckling helix tube type optical fiber knot compared with flush type soil-body landslide sensor is straightened in optical fiber
Structure, high sensitivity, and can perceive it is each move towards cracking.
2. the present apparatus uses flush type compared with surface mount formula coiled fiber cracks sensor, exist without body to be measured
Section；And sensor can will be embedded to any position simultaneously according to specific requirements to test different liftoff depth cracking feelings in the soil body
Condition.
3. native stick is completely the same with soil body composition by taking soil to be made in the soil body to be measured in the present apparatus, and sensing unit with
The soil body merges completely, therefore can accurately reflect soil-body landslide situation to be measured, and measuring accuracy is high.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the monitoring device of the flush type soil-body landslide of embodiment of the utility model；
Fig. 2 is the use state diagram of the monitoring device of flush type soil-body landslide shown in FIG. 1；
Fig. 3 is the fracture width and light function of a kind of monitoring device of the flush type soil-body landslide of embodiment of the utility model
The relationship matched curve figure of rate changing value.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
Fig. 1 schematically shows a kind of monitoring dress of the flush type soil-body landslide of embodiment according to the present utility model
The structure set.
As shown in Figure 1, the monitoring device includes light source 2, light power meter 3, optical fiber and native stick 4.One end of optical fiber receives light
The light that source 2 issues, the other end are connect with light power meter 3.The middle section of optical fiber is around in formation spiral shell tubular light on native stick 4 in the shape of a spiral
Fibre, native stick 4 constitute the sensing unit 5 of the present apparatus with screwed pipe shape optical fiber.The both ends of screwed pipe shape optical fiber are each provided with certain length
Tail optical fiber 7.
Native stick 4 is made by solidifying after native wet molding to be measured, and solidification means include but is not limited to air-dried, frost.It is sensitive
Component 5 is embedded in the soil body to be measured, and is allowed to sufficiently merge with the soil body, the including but not limited to artificial wet fusion of fusion means,
Natural Environment Integration etc..
Fig. 2 schematically shows the use state of the monitoring device of flush type soil-body landslide shown in FIG. 1.
As shown in Fig. 2, the sensing unit 5 being made of screwed pipe shape optical fiber and native stick 4 is embedded in the soil body 1, the soil body and air
Interface 6 and sensing unit 5 vertical range depending on testing requirement.The light that light source 2 issues enters screwed pipe shape optical fiber through tail optical fiber 7
In, due to fibre-optical bending, light intensity generates loss, this light intensity value is detected and recorded by light power meter 3.When the soil body 1 and merge it
In native stick 4 when cracking, the bending state for the screwed pipe shape optical fiber being attached on native stick 4 changes, and then light in optical fiber
Bending loss change, this variation is monitored by light power meter 3, and then may determine that the cracking situation of the soil body 1.
The application method of the monitoring device of the flush type soil-body landslide of the utility model are as follows:
One, is according to the actual conditions of the soil body, and making native stick 4, (preferred value is diameter 6mm, is optionally made into length appropriate
Degree).For example, test is ploughed when hardened situation, arable land soil is taken, is allowed to wet, is put into natural air drying after mold molding.For another example, it uses
When frozen soil cracks and tests, can first measure frozen soil water content, then be dried after taking soil heating to be measured, add with contained by former frozen soil on year-on-year basis
Example moisture content stirs evenly, and is put into merging refrigerator freezing molding after die for molding.
Two, are by optical fiber by a constant pitch (representative value 17mm) uniformly around in native 4 outer surface of stick, formation sensing unit 5, optical fiber
It is fixed with native 4 both ends glue of stick or filament etc..
The native stick 4 for winding optical fiber is embedded in the soil body to be measured by three, is allowed to sufficiently merge with original soil body, for arable land, can be made
Manually wet method fusion；Frozen soil cracking condition monitoring following for zero degrees celsius temperature, after being embedded to sensing unit 5,
Between sensing unit 5 and the soil body plus it is appropriate melt soil, due to temperature in zero degrees celsius hereinafter, sensing unit 5 will with the soil body from
So fusion.
Optical power initial value P0 when the four, record soil body does not crack.
In five, test process, time recording optical power numerical value P1, and make the difference value with P0 and obtain optical power change value.According to
This changing value may determine that soil-body landslide situation.
7 part of tail optical fiber at optical fiber both ends should keep straight condition, and when optical fiber steering must be bent, fiber bending radius is answered
It is sufficiently large, so that when tail optical fiber 7 transmits power loss does not occur for light.
Soil-body landslide of ploughing monitors embodiment:
Step 1: the production of native stick
Arable land soil to be measured is wet, pureed is made, pours into the brown paper tubule that interior diameter is 6mm, it will after natural air drying
Brown paper removal, formation length are the thin stick of 200mm long.
Step 2: single mode optical fiber prebuckling
Will with coat standard traffic single mode optical fiber (production standard: G.652) with screw pitch be 17mm be wrapped on native stick 4,
The both ends that optical fiber is contacted with native stick 4 are fixed with filament, and about 2 meters of long tail optical fibers 7 are stayed at both ends respectively, form sensing unit 5.
Step 3: being embedded to arable land to be measured
Sensing unit 5 is embedded in arable land to be monitored, 10 millimeters of surface distance of 5 upper surface of sensing unit and arable land, tail optical fiber 7
The arable land soil body to be measured is stretched out at both ends, and 7 bending radius of tail optical fiber must be greater than 10 centimetres.Ploughing for covering sensing unit 5 is suitably moistened with water
The ground soil body merges sensing unit 5 with the soil body to be measured.Region of ploughing where sensing unit 5 is set as exclusion area, to prevent sensitive portion
Part 5 bears additonal pressure.
Step 4: test
Stretching out optical fiber pigtail 7 both ends in arable land to be measured to connect wavelength respectively is 1550nm, and intensity value is the light source and light of 180 microwatts
Power meter measures optical power value at this time.When arable land due to arid or it is hardened crack, then it is cultivated according to optical power value variation judgement
Crack situation on ground.
Survey fracture width (x, unit: mm) and optical power change value (y, unit: μ W) relationship fitting result are as follows: y=
2.8663-3.2157x+0.506x2-0.0095x3。
Matched curve is as shown in Figure 3.
In the present embodiment, optical fiber is single mode optical fiber, and light source is single wavelength light source.Prison of the single mode optical fiber for soil-body landslide
It is more sensitive to survey effect.Meanwhile being easier to control bending loss of optical fiber using single wavelength light source, convenient for design.Other
In embodiment, other types of optical fiber can also be used, wideband light source can also be used.
In the present embodiment, optical fiber is around on native stick with screw pitch 17mm, native stick diameter 6mm, length 200mm.In other realities
It applies in example, also can according to need the screw pitch using other specifications, and the diameter and length of native stick 4.
In the present embodiment, the both ends that optical fiber is contacted with native stick 7 are fixed, and 2 meters of tail optical fibers are stayed at optical fiber both ends respectively.In other realities
It applies in example, the length of tail optical fiber 7 also can according to need setting.The purpose of tail optical fiber 7 is that optical signal is drawn in loss-free situation
Body to be measured out can be with arbitrary value depending on length is with actual needs.
In the present embodiment, 10 millimeters of surface distance of sensor upper surface and arable land.It in other embodiments, can be according to reality
It needs to be determined that this distance.
Above-described is only some embodiments of the utility model.For those of ordinary skill in the art,
Without departing from the concept of the present invention, various modifications and improvements can be made, these belong to practical
Novel protection scope.
Claims (5)
1. the monitoring device of flush type soil-body landslide characterized by comprising light source (2), light power meter (3), optical fiber and native stick
(4)；
Described optical fiber one end receives the light that the light source issues, and the other end is connect with the light power meter；
The middle section of the optical fiber is around on the native stick (4) in the shape of a spiral and forms sensing unit (5).
2. monitoring device according to claim 1, which is characterized in that the optical fiber is single mode optical fiber；The light source (2) is
Single wavelength light source.
3. monitoring device according to claim 1, which is characterized in that the diameter of the soil stick (4) is 6mm.
4. monitoring device according to claim 3, which is characterized in that the optical fiber is around in the native stick with screw pitch 17mm
(4) on.
5. monitoring device according to any one of claims 1 to 4, which is characterized in that the optical fiber is contacted with native stick (4)
Both ends are fixed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920088948.5U CN209372712U (en) | 2019-01-16 | 2019-01-16 | The monitoring device of flush type soil-body landslide |
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| CN201920088948.5U CN209372712U (en) | 2019-01-16 | 2019-01-16 | The monitoring device of flush type soil-body landslide |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115201235A (en) * | 2022-09-14 | 2022-10-18 | 中国科学院地质与地球物理研究所 | Multi-physical-field imaging method and system based on PET-CT and DAS |
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2019
- 2019-01-16 CN CN201920088948.5U patent/CN209372712U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115201235A (en) * | 2022-09-14 | 2022-10-18 | 中国科学院地质与地球物理研究所 | Multi-physical-field imaging method and system based on PET-CT and DAS |
| CN115201235B (en) * | 2022-09-14 | 2023-01-06 | 中国科学院地质与地球物理研究所 | Multi-physical-field imaging method and system based on PET-CT and DAS |
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