CN109612905A - A kind of sandy soil seepage flow quantity monitoring method based on Si-DTS - Google Patents
A kind of sandy soil seepage flow quantity monitoring method based on Si-DTS Download PDFInfo
- Publication number
- CN109612905A CN109612905A CN201811535472.1A CN201811535472A CN109612905A CN 109612905 A CN109612905 A CN 109612905A CN 201811535472 A CN201811535472 A CN 201811535472A CN 109612905 A CN109612905 A CN 109612905A
- Authority
- CN
- China
- Prior art keywords
- temperature
- test tube
- sandy soil
- seepage
- dts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
Abstract
The invention discloses a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS, including will have the test tube of heating temp sensing function to be embedded in sandy soil vertically, it is supplied water with certain flow rate to sandy soil, measure the seepage discharge of sandy soil under the flow rate, test tube be powered and measures the initial temperature value of test tube, electrified regulation is carried out to test tube, it is demodulated using DTS demodulated equipment, record the temperature value during test tube electrified regulation, it is poor that temperature value and test tube initial temperature value when being stablized with the test tube temperature field of record are made, obtain temperature intermediate value, it is adjusted to the flow rate of sandy soil water supply, record the seepage discharge of sandy soil and the relevant temperature intermediate value of test tube, analyze the seepage discharge and test tube temperature intermediate value of sandy soil, it is fitted the linear relationship of sandy soil seepage discharge and test tube temperature intermediate value, with this linear relationship, pass through The temperature intermediate value of test tube is measured, can get the seepage discharge of seepage field inside surveyed sandy soil.
Description
Technical field
The invention belongs to sandy soil seepage flow diaster prevention and control fields, and in particular to a kind of sandy soil seepage discharge based on Si-DTS
Monitoring method.
Background technique
The safety monitoring of the rock structures such as anti-for earth and rockfill dam, the native bank of stone, seepage flow is one of most important monitoring content.It is anti-
Seep body be earth and rockfill dam antiseepage core, it mainly utilize the material of low permeability by osmotic control within the allowable range.
Impervious body is divided into core-wall, two class of sloping core by structure type, and filling material includes cohesive soil, calculous soil, Weathered Material and admixture.
Impervious body dam facing, which fills, to be divided into stone, is compacted, takes a sample to check three to master operation, and there are also watering, plane hair, cleaning dam facings, seam
The work of the items such as processing.Impervious body should have enough barrier properties and certain shearing strength, and high core-wall should also have low compressibility.
Therefore, the requirement to impervious body earth material is that permeability is low；Higher shearing strength；Good compaction capacity, compressibility is small, and wants
There is certain plasticity, to adapt to the deformation of dam shell and the dam foundation and unlikely generation crack；There are good erosion resistance, Yi Mianfa
Raw seepage failure etc. generally uses plasticity core-wall and sloping core, is often made of the lesser sticky earth material of infiltration coefficient, size and knot
Structure need to meet reduction infiltration capacity, and reducing saturation and control infiltration gradient prevents the requirement of seepage deformation.
The seepage monitoring of rock structure mainly includes the projects such as osmotic pressure, seepage discharge.Traditional rock structure seepage flow prison
Examining system is mainly made of the osmometer (or pressure-measuring pipe) of measurement osmotic pressure and the weir of measurement seepage discharge.
In recent years the study found that temperature can continue through medium is transmitted, this is just to be structure seepage discharge
Monitoring provides a new Temperature Quantity.In the temperature tracer method of various seepage monitorings, distributed fiber temperature sensing system
System (Distributed Fiber Optic Temperature Sensor System, abbreviation DTS) is more noticeable, and
And at home and abroad achieve certain progress.
Currently, DTS has been attempted applied to Guizhou third stock market face dam, Zhejiang Tongbai power station face dam, wide
In the seepage monitorings of multiple face dam engineerings such as eastern long water transfer power station power station face dam, Guilin Si Anjiang concrete face rockfill dam.
Although distributed optical fiber temperature sensor technology achieves certain achievement in the anti-monitoring of the native bank of stone, there is also many problems,
For example, for seepage discharge it is smaller because with the Rock And Soil temperature difference around it is smaller due to be unable to monitor, measurement accuracy is vulnerable to circumstance of temperature difference
Influence etc..Thus, distributed optical fiber temperature sensor technology may be only available for that the temperature difference is larger, flow velocity biggish seepage field prison at present
It surveys, is not met by the monitoring of all seepage fields.
Summary of the invention
The object of the present invention is to provide a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS, solves existing sandy soil
Seepage flow quantity monitoring method is not suitable for the problem of lesser seepage field of flow velocity monitors.
The technical solution adopted by the present invention is that a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS, specifically includes
Following steps:
Step 1, will there is the test tube of heating temp sensing function to be embedded in sandy soil vertically；
Step 2, with different flow rate VjIt supplies water to the sandy soil of step 1, measures the corresponding seepage discharge q of sandy soilj,
Wherein j=1,2 ..., N；
Step 3, it is powered to test tube in step 1, measures test tube in seepage discharge qjWhen initial temperature valueWherein j
=1,2 ..., N；
Step 4, electrified regulation is carried out to test tube, is demodulated respectively using the DTS (FBG) demodulator being connect with test tube optical cable, records survey
Temperature value of pipe during electrified regulationAnd temperature increment, wherein x=1, when 2 ... ..., m, x=m, the temperature field of test tube
Reach stable,Indicate temperature value of the test tube when temperature field is stablized；
Step 5, temperature value when being stablized with the test tube temperature field that step 4 recordsWith the test tube initial temperature in step 3
ValueIt is poor to make, and obtains temperature intermediate value Δ tj；
Step 6, the seepage discharge q of sandy soil is analyzedjAnd the relevant temperature intermediate value Δ t of test tubej, it is fitted sandy soil seepage discharge qj
With the relevant temperature intermediate value Δ t of test tubejLinear relationship Δ tj=a- β qj, a and β are constant；
Step 7, the temperature intermediate value for measuring test tube in sandy soil, the sandy soil seepage discharge being fitted in conjunction with step 6 and test tube temperature
Spend the linear relationship Δ t of intermediate valuej=a- β qj, calculate the corresponding seepage discharge of sandy soil.
Technical characteristic of the invention also resides in,
In step 3, test tube is in seepage discharge qjWhen initial temperature valueIncluding several measuring points for being chosen in test tube just
Beginning temperature valueWherein, i=1,2 ... ..., γ indicate the measuring point chosen.
In step 5, temperature intermediate value Δ tjExpression formula it is as follows:
Wherein,Expression seepage discharge is qjWhen test tube on i measuring point temperature intermediate value, expression formula is as follows:
In formula,For i measuring point in test tube temperature field stablize when temperature value, DEG C.
Test tube is the pvc pipe for being externally wrapped with temperature measuring optical cable and silicon rubber heating tape, and temperature measuring optical cable and DTS (FBG) demodulator connect
It connects, DTS (FBG) demodulator is connected with distributed optical fiber temperature measurement main controller, and distributed optical fiber temperature measurement main controller is connected with display, silicon rubber
Glue heating tape is connected with power supply.
The width of silicon rubber heating tape is 15mm.
Temperature measuring optical cable is wrapped on pvc pipe, and silicon rubber heating tape is wrapped on the outside of temperature measuring optical cable.
Temperature measuring optical cable diameter is 2.5mm, and temperature measuring optical cable pitch of the laps density is 400 circles/m, and pvc pipe outer diameter is 50m.
Temperature measuring optical cable be spiral steel pipe armored temperature-measuring cables, from inside to outside successively include tight tube fiber, stainless steel helix tube,
Tensile elements, stainless steel mesh grid and oversheath.
In step 2, the corresponding seepage discharge q of sandy soil is measuredjMethod particularly includes: with flow rate VjTo being supplied in sandy soil
Water, measures the water yield of sandy soil in the unit time, and the water yield is flow rate VjWhen sandy soil corresponding seepage flow
Measure qj。
The invention has the advantages that silicon rubber is heated as temperature-measuring optical fiber using spiral steel pipe armored temperature-measuring cables
Band is wrapped on the outside of temperature measuring optical cable, is heated to temperature measuring optical cable, so that temperature measuring optical cable and surrounding sandy soil is generated the larger temperature difference, is mentioned
High DTS (FBG) demodulator is to seepage discharge monitoring accuracy and sensibility；By using the mean temperature intermediate value of multiple measuring points as test tube
Temperature intermediate value, reduce measurement error, make fitting sandy soil seepage discharge and test tube temperature intermediate value linear relation more
Accurately, the accuracy of the seepage discharge of calculating is improved；It can get with this linear relationship by measuring the temperature intermediate value of test tube
The seepage discharge of seepage field inside surveyed sandy soil.
Detailed description of the invention
Fig. 1 is the temperature increment curve of 1 heating process of measuring point in test tube in the embodiment of the present invention；
Fig. 2 is the temperature increment curve of 2 heating process of measuring point in test tube in the embodiment of the present invention；
Fig. 3 is the temperature increment curve of 3 heating process of measuring point in test tube in the embodiment of the present invention；
Fig. 4 is sandy soil seepage discharge and temperature intermediate value fitting result curve graph in the embodiment of the present invention.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, but the present invention does not limit to
In the specific embodiment.
A kind of sandy soil seepage flow quantity monitoring method based on Si-DTS of the present invention, specifically includes the following steps:
Step 1, will there is the test tube of heating temp sensing function to be embedded in sandy soil vertically, test tube is to be externally wrapped with thermometric
The pvc pipe of optical cable and silicon rubber heating tape, temperature measuring optical cable are wrapped on pvc pipe, and silicon rubber heating tape is wrapped in outside temperature measuring optical cable
Side；Temperature measuring optical cable is spiral steel pipe armored temperature-measuring cables, from inside to outside successively includes tight tube fiber, stainless steel helix tube, tension
Element, stainless steel mesh grid and oversheath；Temperature measuring optical cable diameter is 2.5mm, and temperature measuring optical cable pitch of the laps density is 400 circles/m, silicon rubber
The width of glue heating tape is 15mm, and pvc pipe outer diameter is 50m；
Temperature measuring optical cable is connect with DTS (FBG) demodulator, and DTS (FBG) demodulator is connected with distributed optical fiber temperature measurement main controller, distributed light
Fine thermometric main controller is connected with display, and silicon rubber heating tape is connected with power supply；
Step 2, with different flow rate VjIt supplies water to the sandy soil of step 1, measures the corresponding seepage discharge q of sandy soilj,
Wherein j=(1,2 ..., N)；Measure the corresponding seepage discharge q of sandy soiljMethod particularly includes: with flow rate VjTo sandy soil
Middle water supply, measures the water yield of sandy soil in the unit time, and the water yield is flow rate VjWhen sandy soil it is corresponding
Seepage discharge qj。
Step 3, it is powered to test tube, measures the initial temperature value for several measuring points chosen in test tubeIts
In, i=(1,2 ... ..., γ) indicates the measuring point chosen, j=(1,2 ... ..., N)；
Step 4, electrified regulation is carried out to test tube, is demodulated respectively using the DTS (FBG) demodulator being connect with test tube optical cable, records survey
Temperature value of pipe during electrified regulationAnd temperature increment, when wherein x=(1,2 ... ..., m), x=m, the temperature of test tube
Field reaches stable,Indicate temperature value of the test tube when temperature field is stablized；
Step 5, temperature value when being stablized with the test tube temperature field that step 4 recordsWith the test tube initial temperature in step 3
ValueIt is poor to make, and obtains temperature intermediate value Δ tjExpression formula it is as follows:
Wherein,Expression seepage discharge is qjWhen test tube on i measuring point temperature intermediate value, be expressed as follows formula:
In formula,For i measuring point in test tube temperature field stablize when temperature value, DEG C.
Step 6, the seepage discharge q of sandy soil is analyzedjAnd the relevant temperature intermediate value Δ t of test tubej, it is fitted sandy soil seepage discharge qj
With the relevant temperature intermediate value Δ t of test tubejLinear relationship Δ tj=a- β qj, a and β are constant；
Step 7, the temperature intermediate value for measuring test tube in sandy soil, the sandy soil seepage discharge being fitted in conjunction with step 6 and test tube temperature
Spend the linear relationship Δ t of intermediate valuej=a- β qj, calculate the corresponding seepage discharge of sandy soil.
Embodiment 1
A kind of sandy soil seepage flow quantity monitoring method based on Si-DTS, specifically includes the following steps:
Step 1, it is put into one layer of rubble in cylindrical model bottom of the tube, then pads upper sand net, there will be heating temp sensing function
Test tube be put into model pipe on central axes vertically, in model pipe fill saturated sand fix test tube, sandy soil is hit
After reality, by test tube temperature measuring optical cable and silicon rubber heating tape from model pipe Base top contact come, temperature measuring optical cable be sequentially connected DTS solution
Adjusting instrument, distributed optical fiber temperature measurement main controller and display, display is computer, and silicon rubber heating tape is connected to AC power source；
Test tube is the pvc pipe for being externally wrapped with temperature measuring optical cable, and silicon rubber heating tape has been closely wound outside temperature measuring optical cable, is surveyed
Warm optic cable diameter is 2.5mm, and temperature measuring optical cable pitch of the laps density is 400 circles/m, and pvc pipe outer diameter is 50m, the width of silicon rubber heating tape
For 15mm, temperature measuring optical cable is connected with DTS, and silicon rubber heating tape is connected with power supply；Temperature measuring optical cable is spiral steel pipe armored temperature measuring light
Cable successively includes tight tube fiber, stainless steel helix tube, tensile elements, stainless steel mesh grid and oversheath from inside to outside；
By the spiral uniform winding of temperature measuring optical cable on the cylindrical pvc pipe that diameter is R, length is l, the optical cable of coiling is total
Length L and pitch of the laps density N have following relationship:
L≈2NπRl (1)
2N π R times can be improved with spatial resolution according to the calculating of formula (1).Temperature measuring optical cable used in the present embodiment around
Circle density is 400 circles/m, pipe outside diameter 50mm, and spatial resolution improves about 62 times after calculating, reaches 6.5mm；
Step 2, with different flow rate VjIt supplies water to the sandy soil of step 1, measures the corresponding seepage discharge q of sandy soilj,
Wherein j=(1,2 ..., N)；Measure the corresponding seepage discharge q of sandy soiljMethod particularly includes: with flow rate VjTo sandy soil
The water yield of sandy soil in the unit time, as flow rate V are measured in middle water supplyjWhen sandy soil corresponding seepage discharge qj；
Step 3,1 measurement point, respectively measuring point 1, measuring point 2 are taken every 10cm from top to bottom to test tube described in step 1
It is then powered to test tube described in step 1 with measuring point 3, measures the initial temperature value of 3 measuring points in test tubeIts
In, i=(1,2 ... ..., γ) indicates the measuring point chosen；
Step 4, electrified regulation is carried out to test tube, is demodulated respectively using the DTS (FBG) demodulator being connect with test tube optical cable, records survey
Temperature value of each measuring point during electrified regulation on pipeWhen wherein x=(1,2 ... ..., m), x=m, the temperature field of test tube
Reach stable,It indicates temperature value of the test tube when temperature field is stablized, uses temperature valueSubtract the initial temperature value of each measuring pointObtain the temperature increment of each measuring point, respectively draw measuring point 1,3 heating process of measuring point 2 and measuring point temperature increment curve (see
Fig. 1, Fig. 2 and Fig. 3)；
DTS demodulated equipment is to carry out distributed temperature measurements based on Raman optical time domain emission measurement technology, and temperature-sensing element is
Temperature measuring optical cable described in step 1；Raman diffused light is made of stokes light and anti-Stokes light.Wherein stokes light and temperature
Spend it is unrelated, and the intensity of anti-Stokes light then variation with temperature and change.The ratio between anti-Stokes light and stokes light
It is indicated with temperature relation by formula (2)
In formula: las is anti-Stokes light intensity；Ls is Stokes light intensity；A is temperature correlation coefficient；H is Planck system
Number, Js；The light velocity in c vacuum, m/s；V Raman translational movement, m-1；The graceful constant of ω Bauer thatch；γ is kelvin rating.
The temperature of optical cable can be calculated by formula (2), still, it is also necessary to know the corresponding positional value of the temperature value.Therefore
It can solve the problem using optical time domain reflection technology (OTDR).To a branch of pulsed light of fibre optical transmission, which can be with slightly lower
The speed of the light velocity in vacuum is propagated forward, while transmitting scattering light around.A part of scattering light can be returned again along optical fiber
Return to incidence end, measure the time difference between incident light and reflected light, then emit the position of scattering light away from the distance of incidence end by
Formula (3) indicates
In formula: X is the position of transmitting scattering light away from the distance of incidence end；Time difference of the θ between incident light and reflected light；
C0For the light velocity in optical fiber, C0=c/n；The refractive index of n optical fiber.
Step 5, temperature value when being stablized with the test tube temperature field that step 4 recordsWith the test tube initial temperature in step 3
ValueIt is poor to make, and obtains temperature intermediate value Δ tjExpression formula it is as follows:
Wherein,Expression seepage discharge is qjWhen test tube on i measuring point temperature intermediate value, expression formula is as follows:
In formula,For i measuring point in test tube temperature field stablize when temperature value, DEG C.
The present invention uses silicon rubber heating tape, is evenly heated to temperature measuring optical cable, and with volume under constant current effect
Determine power and generates heat.It is heated by being powered, temperature measuring optical cable is considered as a superposition temperature field, makes temperature measuring optical cable and rock soil medium
The temperature difference is generated between leakage.Due to leaking the heat that can persistently take away in flow process around optical cable for sensing, and heat
Changing value connects the temperature for influencing temperature measuring optical cable, while closely related with seepage discharge.When the heat that seepage flow is taken away adds with silicon rubber
When the heat that the torrid zone generates is equal, the heat between silicon rubber heating optical cable and surrounding Rock And Soil just reaches dynamic equilibrium, silicon rubber
The heat that heating tape generates also tends to a stationary value, is no longer changed.Therefore, defining this stable heat is DTS's
Temperature intermediate value, it is clear that the size of temperature intermediate value and seepage discharge are closely related.According to this principle, silicon rubber is measured by DTS and is added
The heat signature value in the torrid zone, so that it may obtain the seepage discharge size distribution along silicon rubber heating optical cable.The diabatic process can be with
It is described with following heat transfer equation
Δ P=α (t-t0) (6)
In formula (6): α is material specific heat capacity；Δ P is the heat that optical cable receives；T is in for electrified regulation optical cable stablizes shape
Temperature when state, i.e., temperature averages when each measuring point is in stable state in test tubet0To heat the initial of initial stage
Temperature, i.e. test tube initial temperature value
Step 6, the seepage discharge q of sandy soil is analyzedjAnd the relevant temperature intermediate value Δ t of test tubej, it is fitted sandy soil seepage discharge qj
With the relevant temperature intermediate value Δ t of test tubejLinear relationship Δ tj=a- β qj, a and β are constant；
According to the conservation of energy, optical cable under stable state, the heat that optical cable receives in heating process is equal to silicon rubber
The difference for the heat that the heat and seepage discharge that glue heating tape is generated due to electrified regulation are taken away, i.e.,
In formula: Q1For optical cable fever gross energy；Q2The heat taken away for percolating water；P is heating tape heating power；β is thermally conductive
Coefficient, it and flow velocity V are positively correlated, therefore, Q2It is also positively correlated with V；K is flow velocity heat transfer coefficient；Exist for heat carrier
Temperature gradient on different directions；A0For heat carrier sectional area；n0It is direction unit vector；A is the area of section of water seepage.It is logical
It crosses formula (6) and the solution of (7) joint obtains flow and the relationship of temperature is
In formula: enablingAnd a, b be with seepage discharge q it is unrelated with temperature t be
Number, therefore, q is in a linear relationship with t；
It enablesβ=b, then t-t0=a- β q, i.e. Δ tj=a- β qj,
Then qjWith Δ tjIt is in a linear relationship, and be negatively correlated, seepage discharge qjIt is bigger, temperature intermediate value Δ tjIt is smaller；
It is adjusted to the flow rate of sandy soil water supply, changes seepage field inside sandy soil, records the corresponding of different seepage fields
The temperature intermediate value of seepage discharge and test tube, such as table 1；
The temperature intermediate value of each measuring point in 1 embodiment of the present invention of table
Analyze the seepage discharge q of sandy soiljWith the relevant temperature intermediate value Δ t of test tubej, it is fitted sandy soil seepage discharge qjWith test tube
Temperature intermediate value Δ tjLinear relationship Δ tj=a- β qj, it draws matched curve (such as Fig. 4), obtains respective function relational expression:
Δtj=-7.0909qj+23.738 (9)
In formula (9), qjIndicate seepage flow magnitude, cm3/s；ΔtjIndicate the temperature intermediate value of test tube, DEG C.
From fig. 4, it can be seen that there are linear relationships between test tube temperature intermediate value and seepage discharge, seepage discharge is bigger, and temperature is situated between
It is worth smaller；
Step 7, the temperature intermediate value for measuring test tube in this kind of sandy soil, this kind of sandy soil seepage discharge being fitted in conjunction with step 6
With the corresponding linear relationship delta t of test tube temperature intermediate valuej=-7.0909qj+ 23.738, the corresponding seepage discharge of sandy soil can be calculated.
Claims (9)
1. a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS, which is characterized in that specifically includes the following steps:
Step 1, will there is the test tube of heating temp sensing function to be embedded in sandy soil vertically；
Step 2, with different flow rate VjIt supplies water to the sandy soil of step 1, measures the corresponding seepage discharge q of sandy soilj, wherein j
=1,2 ..., N；
Step 3, it is powered to test tube described in step 1, measures test tube in seepage discharge qjWhen initial temperature valueWherein j
=1,2 ..., N；
Step 4, electrified regulation is carried out to test tube, is demodulated respectively using the DTS (FBG) demodulator being connect with test tube optical cable, records test tube and exist
Temperature value during electrified regulationAnd temperature increment, wherein x=1,2 ... ..., m,Indicate test tube when temperature field is stablized
Temperature value；
Step 5, temperature value when being stablized with the test tube temperature field that step 4 recordsWith the test tube initial temperature value in step 3
It is poor to make, and obtains temperature intermediate value Δ tj；
Step 6, the seepage discharge q of the sandy soil is analyzedjAnd the relevant temperature intermediate value Δ t of test tubej, it is fitted sandy soil seepage discharge qj
With the relevant temperature intermediate value Δ t of test tubejLinear relationship Δ tj=a- β qj, a and β are constant；
Step 7, the temperature intermediate value for measuring test tube in the sandy soil, the sandy soil seepage discharge being fitted in conjunction with step 6 and test tube temperature
Spend the linear relationship Δ t of intermediate valuej=a- β qj, calculate the corresponding seepage discharge of sandy soil.
2. a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS according to claim 1, which is characterized in that described
In step 3, test tube is in seepage discharge qjWhen initial temperature valueInitial temperature value including several measuring points chosen in test tubeWherein, i=1,2 ... ..., γ indicate the measuring point chosen.
3. a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS according to claim 2, which is characterized in that described
In step 5, temperature intermediate value Δ tjExpression formula it is as follows:
Wherein,Expression seepage discharge is qjWhen test tube on i measuring point temperature intermediate value, expression formula is as follows:
In formula,For i measuring point in test tube temperature field stablize when temperature value, DEG C.
4. a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS according to claim 1, which is characterized in that described
Test tube is the pvc pipe for being externally wrapped with temperature measuring optical cable and silicon rubber heating tape, and temperature measuring optical cable is connect with DTS (FBG) demodulator, DTS demodulation
Instrument is connected with distributed optical fiber temperature measurement main controller, and distributed optical fiber temperature measurement main controller is connected with display, and silicon rubber heating tape connects
It is connected to power supply.
5. a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS according to claim 4, which is characterized in that described
The width of silicon rubber heating tape is 15mm.
6. a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS according to claim 4, which is characterized in that described
Temperature measuring optical cable is wrapped on pvc pipe, and silicon rubber heating tape is wrapped on the outside of temperature measuring optical cable.
7. a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS according to claim 6, which is characterized in that described
Temperature measuring optical cable diameter is 2.5mm, and temperature measuring optical cable pitch of the laps density is 400 circles/m, and the pvc pipe outer diameter is 50m.
8. a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS according to claim 7, which is characterized in that described
Temperature measuring optical cable is spiral steel pipe armored temperature-measuring cables, from inside to outside successively includes tight tube fiber, stainless steel helix tube, tension member
Part, stainless steel mesh grid and oversheath.
9. a kind of sandy soil seepage flow quantity monitoring method based on Si-DTS according to claim 1, which is characterized in that described
In step 2, the corresponding seepage discharge q of sandy soil is measuredjMethod particularly includes: with flow rate VjTo supplying water in sandy soil, measure
The water yield of sandy soil in unit time, the water yield are flow rate VjWhen sandy soil corresponding seepage discharge qj。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811535472.1A CN109612905A (en) | 2018-12-14 | 2018-12-14 | A kind of sandy soil seepage flow quantity monitoring method based on Si-DTS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811535472.1A CN109612905A (en) | 2018-12-14 | 2018-12-14 | A kind of sandy soil seepage flow quantity monitoring method based on Si-DTS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109612905A true CN109612905A (en) | 2019-04-12 |
Family
ID=66009982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811535472.1A Pending CN109612905A (en) | 2018-12-14 | 2018-12-14 | A kind of sandy soil seepage flow quantity monitoring method based on Si-DTS |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109612905A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8100005B2 (en) * | 2009-03-31 | 2012-01-24 | Nanyang Technological University | Permeate flow distribution measurement in a membrane filtration system |
| CN103364321A (en) * | 2013-07-19 | 2013-10-23 | 河海大学 | Distributed optical fiber test platform for monitoring earth rock dam seepage condition |
| CN103364320A (en) * | 2013-07-19 | 2013-10-23 | 河海大学 | Distributed optical fiber testing method for porous medium structure seepage |
| CN103439239A (en) * | 2013-09-04 | 2013-12-11 | 南京大学 | Distributed rock and soil mass seepage velocity monitoring method and system |
| CN205280545U (en) * | 2015-12-07 | 2016-06-01 | 西安理工大学 | Seepage tests sand post or earth pillar suitable for nuclear magnetic resonance analysis and imaging system |
-
2018
- 2018-12-14 CN CN201811535472.1A patent/CN109612905A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8100005B2 (en) * | 2009-03-31 | 2012-01-24 | Nanyang Technological University | Permeate flow distribution measurement in a membrane filtration system |
| CN103364321A (en) * | 2013-07-19 | 2013-10-23 | 河海大学 | Distributed optical fiber test platform for monitoring earth rock dam seepage condition |
| CN103364320A (en) * | 2013-07-19 | 2013-10-23 | 河海大学 | Distributed optical fiber testing method for porous medium structure seepage |
| CN103439239A (en) * | 2013-09-04 | 2013-12-11 | 南京大学 | Distributed rock and soil mass seepage velocity monitoring method and system |
| CN205280545U (en) * | 2015-12-07 | 2016-06-01 | 西安理工大学 | Seepage tests sand post or earth pillar suitable for nuclear magnetic resonance analysis and imaging system |
Non-Patent Citations (2)
| Title |
|---|
| 严琨凡等: "基于碳纤维加热光缆的砂性土渗流场C-DTS分布式监测试验研究", 《岩土力学》 * |
| 蒋 力等: "基于分布式光纤技术的渗流监测试验探论", 《大坝与安全》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103364320B (en) | The distribution type fiber-optic method of testing of porous media structure body seepage flow | |
| CN109596496A (en) | A kind of sandy soil seepage discharge monitoring platform based on Si-DTS | |
| CN104237301B (en) | In-situ thermal response testing method for layered rock and soil thermophysical properties | |
| CN103353322B (en) | Earth-rock dam seepage line monitoring method based on distributed type fiber temperature detecting system | |
| US10393919B2 (en) | Methods and apparatus for determining downhole parametes | |
| CN103439239B (en) | A kind of Rock And Soil seepage flow rate distribution formula monitoring method and system | |
| CA2643242C (en) | Temperature sensor using an optical fiber | |
| CN111624227B (en) | Distributed soil body heat conductivity coefficient test system and test method thereof | |
| US20110315375A1 (en) | System and method for determining downhole fluid parameters | |
| CN106248174B (en) | A kind of soil stone dam seepage saturated surface optical fiber monitoring device and method | |
| CN107727271B (en) | Diaphram wall leak detection apparatus based on distributed optical fiber temperature measurement | |
| CN102305965B (en) | Sensing optical cable for synchronously monitoring temperature and pressure in oil well tubing in distribution mode | |
| CN103282602A (en) | Distributed fluid velocity sensor and associated method | |
| CN103091359A (en) | System for detecting integrity of grouting pile foundations based on distributed optical fiber temperature sensing technology | |
| Cheng et al. | An experimental study on monitoring the phreatic line of an embankment dam based on temperature detection by OFDR | |
| CN101713650A (en) | Fiber bragg grating inclinometer and inclinometry algorithm | |
| CN105651812A (en) | DTS-based design method of detection system for detecting integrity of cast-in-place pile | |
| CN110118795A (en) | A kind of complex ecosystem evapotranspires system for measuring quantity and its operating method | |
| CN206960005U (en) | A kind of temperature sensing optical cable fixing device | |
| CN205210001U (en) | Coefficient of heat conductivity surveys device | |
| CN110596182A (en) | Geomembrane damage leakage amount monitoring system and method based on distributed optical fibers | |
| CN103968784A (en) | Liquid level type strain sensor | |
| CN109612905A (en) | A kind of sandy soil seepage flow quantity monitoring method based on Si-DTS | |
| Brown et al. | Slickline with fiber-optic distributed temperature monitoring for water-injection and gas lift systems optimization in Mexico | |
| CN103741728B (en) | Based on the cast-in-situ concrete large-diameter tubular pile pile strain monitoring method of FBG sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190412 |
|
| RJ01 | Rejection of invention patent application after publication |