CN113109236A - Foam permeation monitoring system and method based on optical fiber sensing - Google Patents
Foam permeation monitoring system and method based on optical fiber sensing Download PDFInfo
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- 239000006260 foam Substances 0.000 title claims abstract description 128
- 239000013307 optical fiber Substances 0.000 title claims abstract description 96
- 238000012544 monitoring process Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000002689 soil Substances 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 28
- 238000012545 processing Methods 0.000 claims abstract description 16
- 239000011148 porous material Substances 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 230000008595 infiltration Effects 0.000 claims description 34
- 238000001764 infiltration Methods 0.000 claims description 34
- 230000008569 process Effects 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 15
- 239000004088 foaming agent Substances 0.000 claims description 12
- 230000035515 penetration Effects 0.000 claims description 10
- 239000000523 sample Substances 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 3
- 239000000565 sealant Substances 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 230000005641 tunneling Effects 0.000 abstract description 5
- 239000012466 permeate Substances 0.000 abstract description 3
- 238000005187 foaming Methods 0.000 description 10
- 230000006872 improvement Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000011155 quantitative monitoring Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- 239000000047 product Substances 0.000 description 1
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- 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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a foam permeation monitoring system and method based on optical fiber sensing, and the technical scheme is as follows: the device comprises a foam permeation device and an observation device, wherein the foam permeation device comprises a transparent permeation container used for filling soil particles, and the top end of the permeation container is connected with a foam generation device; an optical fiber detection module for monitoring the foam seepage speed is arranged in the seepage container; the observation device comprises an image acquisition device for acquiring foam permeation information, the image acquisition device is connected with an image processing device, and the image processing device records and stores the information. The invention can monitor the seepage velocity of the foam in the soil particle pores and can observe the volume and decay rule of the foam when the soil particle pores permeate; therefore, the parameters of improving the muck during shield tunneling can be determined.
Description
Technical Field
The invention relates to the field of muck improvement, in particular to a foam permeation monitoring system and method based on optical fiber sensing.
Background
In underground traffic construction, the shield method is used as a fully-mechanized construction method in underground excavation construction, has high automation degree and high construction speed, can form a hole at one time, is not influenced by weather, and has wide application due to economic superiority. At present, the type of the shield machine applied to urban subway construction in China is mainly an earth pressure balance type shield machine, and the principle of the shield machine is that the passive earth pressure in an excavation face notch ring and the active earth pressure outside an excavation face cutter head keep balance, so that earth and sand serving as a supporting medium are required to have good plastic flow property so as to ensure the tunneling efficiency. However, since general soil does not fully satisfy these characteristics, improvement of the soil residue is required.
The muck improvement is to inject a modifier into an excavation surface or a soil cabin through special equipment on a shield machine, and adjust the cut soil body into a plastic flowing state, wherein the improved muck has good plasticity, low permeability and small friction resistance, so that the shield tunneling is ensured to be smoothly carried out. The foaming agent is also called as a foaming agent, can reduce the surface tension of liquid, generates a large amount of uniform and stable foams, and is widely used as a soil modifier in the shield industry.
In recent years, a large amount of foaming agents for improving the muck in China are put on the market, but the existing products still have the defects of low foaming times, large application mixing amount and the like, so that related personnel perform a large amount of experiments to improve the foaming agents so as to achieve a better muck improving effect. Research shows that the higher the mixing degree of the foam and the soil body is, the better the improvement effect is, and the foam needs to be permeated in soil particles to a certain extent so as to be fully mixed with the soil body, and the tests are closely related to the permeation process of the foam in the muck. However, the inventor finds that at present, no equipment for intuitively observing the penetration rule of the foam in the soil particle pores exists, so that the mechanism of the foam penetration process is unclear, the related research is deficient, and great difficulty is brought to the use of the foaming agent in the improvement of the muck.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a foam permeation monitoring system and method based on optical fiber sensing, which can monitor the seepage velocity of foam in soil particle pores and can observe the volume and decay rule of the foam when the soil particle pores permeate; therefore, the parameters of improving the muck during shield tunneling can be determined.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a foam permeation monitoring system based on optical fiber sensing, including:
the foam permeation device comprises a transparent permeation container used for filling soil particles, and the top end of the permeation container is connected with the foam generation device; an optical fiber detection module for monitoring the foam seepage speed is arranged in the seepage container;
and the observation device comprises an image acquisition device for acquiring foam permeation information, the image acquisition device is connected with an image processing device, and the image processing device records and stores the information.
As a further implementation manner, the optical fiber detection module includes a multimode optical fiber, the multimode optical fiber is connected to the heating device, and the multimode optical fiber is connected to the host through a pulse laser device.
As a further implementation manner, the optical fiber detection module comprises an optical fiber sensor, and the optical fiber sensor is connected with the host through a pulse laser device; the optical fiber sensor is inserted into the infiltration container from a preformed hole on one side of the infiltration container.
As a further implementation mode, the image acquisition device adopts an electron microscope, a plurality of observation windows for observing the electron microscope are axially arranged on the permeation container at intervals, and a test strip is arranged on one side of each observation window.
As a further implementation, the multimode optical fiber is arranged in an S-shape within the infiltration vessel.
As a further implementation, the image capturing device employs a camera.
As a further implementation mode, a bracket is installed at the bottom of the infiltration container, a tray used for supporting soil body particles is placed above the bracket, and air holes are formed in the surface of the tray.
As a further implementation mode, a plurality of columns with vertical axes are distributed in the infiltration container, and one ends of the columns are connected into a whole through a connecting part.
In a second aspect, an embodiment of the present invention further provides a foam permeation monitoring method based on optical fiber sensing, where the monitoring system is adopted, and the method includes:
arranging the multimode optical fiber in an S shape in a penetration container, and filling soil body particles into the penetration container;
adjusting the foam generating device to form a uniform and stable permeation field, and injecting foam through a foam inlet at the top of the permeation container;
monitoring the temperature of the multimode optical fiber through a host to monitor the seepage velocity of foam in the pores of soil particles;
after the time is set, heating the multimode optical fiber by a heating device;
and observing the foam permeation process through an observation window by an electron microscope, and recording and processing data by an image processing device.
In a third aspect, an embodiment of the present invention further provides a foam permeation monitoring method based on optical fiber sensing, where the monitoring system includes:
inserting a probe of the optical fiber sensor into a preformed hole of the infiltration container, and sealing by using a sealant;
adjusting the foam generating device to form a uniform and stable permeation field, and injecting foam through a foam inlet at the top of the permeation container;
monitoring the temperature of the optical fiber sensor through a host to monitor the seepage velocity of the foam in the pores of the soil particles;
the camera observes the foaming agent permeation process, and the image processing device records and processes data.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
(1) in one or more embodiments of the invention, the host monitors the temperature of the multimode optical fiber or the optical fiber sensor, thereby realizing the monitoring of the seepage velocity of the foam in the soil particle pores; the observation device can be used for observing the volume, position change, decay rule and the like of the foam during the penetration of soil particle pores in real time, and observing the penetration process of the foam in real time and in the whole process, which is very important for determining the muck improvement parameters during shield tunneling and which foaming agent is adopted.
(2) According to one or more embodiments of the invention, different observation devices can be selected, when the observation device adopts an electron microscope, a plurality of observation windows are arranged on the permeation container to determine the observation point of the electron microscope, and the microscope is opposite to the observation windows, so that the permeation condition of the foam can be observed in real time conveniently.
(3) The foam permeation device of one or more embodiments of the present invention is connected to a foam generation device at the top thereof, so that the foam permeates through the foam permeation device from top to bottom, thereby realizing observation of the foam permeation process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a front view of a permeation vessel according to a first embodiment of the present invention;
FIG. 3 is a side view of an infiltration vessel according to a first embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 5 is a front view of a permeation vessel according to a second embodiment of the present invention;
FIG. 6 is a side view of a permeation vessel according to example two of the present invention;
the device comprises a heating device 1, a distributed optical fiber temperature sensing system 2, a foam generating device 3, a foam permeation device 4, a foam permeation device 5, an observation device 6, an alternating current power supply 7, a voltage regulator 8, a heating resistance wire 9, a host computer 10, a multimode optical fiber 11, a solution pump 12, an air compressor 13, a gas flow meter 14, a foaming gun 15, a valve 16, a side plate 17, a top plate 18, a bottom plate 19, a bracket 20, a tray 21, a test strip 22, an observation window 23, a foam inlet 24, a water collecting hole 25, an electron microscope 26, an image acquisition device 27, an optical fiber amplifier 28, an optical fiber 29, an optical fiber probe 30, a camera 31, a container body 32, a connecting part 33 and a column.
Detailed Description
The first embodiment is as follows:
the embodiment provides a foam permeation monitoring system based on optical fiber sensing, as shown in fig. 1, which includes a foam generating device 3, a foam permeation device 4 and an observation device 5, wherein the foam generating device 3 is connected to the top end of the foam permeation device 4, so that foam enters the foam permeation device 4 from top to bottom; the foam permeating device 4 is provided with an optical fiber detection module, and the optical fiber detection module of the embodiment adopts a distributed optical fiber temperature sensing system 2. The observation device 5 is used for observing the foam permeation inside the foam permeation device 4.
Further, the foam generating device 3 comprises a solution pump 11, an air compressor 12, a gas flow meter 13 and a foaming gun 14, wherein the foaming gun 14 is provided with two input ports and one output port, and one of the input ports is connected with the solution pump 11 through a pipeline; the other input port is connected with an air compressor 12 through a pipeline, and a gas flow meter 13 is connected between the air compressor 12 and a foaming gun 14 so as to ensure that the flow rate of the compressed air is stable.
The output port of the foaming gun 14 is connected with the foam permeation device 4 through a pipeline, the pipeline is provided with a valve 15, and the foam output quantity is controlled through the valve 15.
Furthermore, the foam permeation device comprises a permeation container used for filling soil particles, and the permeation container is transparent and is convenient for observing the permeation condition of the internal foam. The infiltration container may be of a cubic, cylindrical or other configuration as long as it is capable of holding soil particles.
In the present embodiment, as shown in fig. 2 and 3, the infiltration container is a cubic structure, which includes four side plates 16 connected in sequence, a top plate 17 is installed at the top end of each side surface 16, and a bottom plate 18 is installed at the bottom end; the top plate 17 is connected with the bottom plate 18 through a plurality of screws, and the plates are connected through the screws to form a closed structure.
Furthermore, the top plate 17 and the bottom plate 18 are provided with a clamping groove respectively at corresponding positions, and the clamping groove is used for clamping the side plate 16. And a rubber gasket is arranged in the clamping groove to enhance the tightness of the equipment. The top plate 17 and the bottom plate 18 are provided with a plurality of through holes for adjusting the mounting position of the screw.
Further, the top plate 17 is provided with a foam inlet 23, and the foam inlet 23 is connected with an output port of the foaming gun 14; the foam enters the top of the infiltration vessel from the foaming gun 14 and penetrates from top to bottom. The bottom plate 18 is provided with a water collecting hole 24 for collecting the foam liquid after seepage; the water collecting hole 24 is provided with a valve.
In order to facilitate the seepage liquid to flow out from the water collecting holes 24, the inner surface of the bottom plate 18 is symmetrically provided with inclined surfaces. In this embodiment, the included angle between the inclined surface and the horizontal plane is set to be 4 °, and of course, the included angle can be adjusted according to the actual test requirements.
Furthermore, a bracket 19 is arranged on the upper surface of the bottom plate 18, a tray 20 is arranged on the bracket 19, and the tray 20 can be taken down from the bracket 19 during cleaning, so that the cleaning is convenient. The tray 20 is uniformly provided with water permeable holes to fix the sample and ensure the foam seepage.
The bracket 19 is not limited to a specific structure as long as it can satisfy a supporting function. The tray 20 is shaped to conform to the cross-section of the infiltration vessel. The sizes of the infiltration container, the bracket 19 and the tray 20 can be set according to the actual test requirements, and the sizes of all the components in the foam infiltration device of the embodiment are as follows:
the side plates 16 are made of transparent organic glass with the length of 200mm, the thickness of 10mm and the height of 650mm, so that the permeation state of foam can be observed conveniently in real time, the height of the bracket 19 is 50mm, and the tray 20 is a stainless steel tray with the length of 200mm and the thickness of 5 mm. The top plate 16 and the bottom plate 17 are made of stainless steel plates having a thickness of 10 mm.
One or more of the side plates 16 are provided with a plurality of observation windows 22 at intervals along the axial direction thereof so as to accurately observe the change characteristics of the sample in the test process and ensure the stable observation range. In the present embodiment, the observation window 22 is provided in a rectangular shape. For example, the observation windows 22 having a side length of 50mm are provided every 50 mm.
Furthermore, a test strip 21 is arranged on one side of the observation window 22, and the test strip 21 is provided with scales and is arranged along the axial direction of the infiltration container. In this example, the test strip 21 has an accuracy of 1mm for observing the change in the height of the specimen that may occur during the test.
As shown in fig. 1, the distributed optical fiber temperature sensing system 2 includes a multimode optical fiber 10 and a host 9, wherein the multimode optical fiber 10 adopts a carbon fiber internal heating multimode optical fiber for reflecting the penetration speed of foam in the pores of soil particles. The multimode optical fiber 10 is connected with the optical fiber connector, and the host 9 is connected with the multimode optical fiber 10 through the pulse laser device and outputs light pulse.
In this embodiment, as shown in fig. 3, the multimode optical fiber 10 is distributed in an S-shape along the axial direction of the infiltration vessel to obtain the seepage data at different positions.
Further, the multimode optical fiber 10 is connected with a heating device 1, and the heating device 1 heats the multimode optical fiber 10 to improve the temperature gradient of the soil and the foam. In this embodiment, the heating device 1 mainly includes a parallel circuit composed of an ac power supply 6, a voltage regulator 7, and a heating resistance wire 8, heats the multimode optical fiber 10 through the heating resistance wire 8, and controls the voltage through the voltage regulator 7 to control the heating power.
Further, the observation device includes an image acquisition device and an image processing device 26, in this embodiment, the image acquisition device employs an electron microscope 25, and the image processing device 26 employs a computer. The electron microscope 25 faces the observation window 22, so that the permeation of the foam can be observed in real time. The electron microscope 25 is connected to a computer, and data is recorded and stored by the computer.
The process of carrying out the permeation test by using the foam permeation monitoring system of the embodiment is as follows:
(1) a infiltration vessel in which the multimode optical fiber 10 is embedded is constructed.
The multimode optical fibers 10 are arranged in an S shape, soil body particles which are prepared in advance according to particle size grading are added into the infiltration container in a layer-by-layer filling mode, a tamping rod is used for uniformly impacting for a plurality of times after the set height is reached, and the step is repeated until all the soil body is filled.
In the present embodiment, the spacing between adjacent multimode optical fibers 10 is 10 cm; filling the infiltration container according to the height of each layer of soil particles of 5 cm.
(2) The foam-generating device 3 is adjusted to form a uniform and stable permeation field.
After the pressure regulator 12 is adjusted to a certain determined position based on the gas flowmeter 13, the outflow rate of the foam generating device 3 is continuously monitored, and when the foaming of the foaming agent is stable, a uniform and stable permeation field is considered to be formed.
(3) The host machine 9 monitors the temperature of the multimode optical fiber 10 by injecting foam through a foam inlet 23 at the top of the infiltration vessel, thereby monitoring the seepage velocity of the foam in the pores of the soil particles.
(4) After the set time, the multimode optical fiber 10 is heated by the heating device 1, so that the temperature around the optical fiber is raised, and the temperature gradient of soil and foam is improved. When leakage occurs around the optical fiber, the temperature rise amplitude of the optical fiber is obviously small, the temperature is lower, and leakage positioning and quantitative monitoring information can be obtained more obviously.
(5) The electron microscope 25 observes the penetration process of the foaming agent through the observation window 22, so as to observe the volume and decay law of the foam when the soil particles are penetrated.
(6) And recording the related test result, and performing subsequent image and data processing.
Example two:
the embodiment provides a foam permeation monitoring system based on optical fiber sensing, as shown in fig. 4, the system comprises a foam generating device 3, a foam permeation device 4 and an observation device 5, wherein the foam generating device 3 is connected with the top end of the foam permeation device 4, so that foam enters the foam permeation device 4 from top to bottom; the foam permeating device 4 is provided with an optical fiber detection module, and the optical fiber detection module of the embodiment adopts an optical fiber sensor. The observation device 5 is used for observing the foam permeation inside the foam permeation device 4.
The structure of the foam generating device 3 is the same as that of the first embodiment, and is not described herein again.
Further, the foam infiltration apparatus 4 comprises an infiltration container, as shown in fig. 5 and 6, the infiltration container comprises a container body 31, a top plate 17 and a bottom plate 18, the top plate 17 is mounted on the top of the container body 31, and the bottom plate 18 is mounted on the bottom of the container body 31 to form a closed structure.
In this embodiment, the container body 31 is made of transparent organic glass and has a rectangular parallelepiped structure. The top plate 17 is provided with a foam inlet 23, and the bottom plate 18 is provided with a water collecting hole 24. The size of the container body 31 can be set according to actual requirements, for example, the container body 31 has the size of 10cm long, 4cm wide, 30cm high and 5mm thick.
The container body 31 has a plurality of columns 33 for simulating porous media distributed therein in a direction perpendicular to the axis thereof, the columns 33 being distributed in the height direction of the support portion 32. In the present embodiment, the support portion 32 has a rectangular parallelepiped structure, for example, 9cm long, 25cm high, and 10mm thick. The pillars 33 and supports 32 are made of a photo-curable polymer (NOA81) by soft imprint lithography.
Furthermore, the optical fiber sensor is connected with the host 9, the optical fiber sensor comprises an optical fiber amplifier 27, an optical fiber 28 and an optical fiber probe 29, the optical fiber probe 29 is connected with the optical fiber amplifier 27 through the optical fiber 28, and the optical fiber amplifier 27 is connected with the host 9. One side of the container body 31 is an observation side, a plurality of prepared holes are arranged on the side opposite to the observation side, and the optical fiber probe 29 is inserted into the porous medium from the prepared holes.
Further, the observation device includes a camera 30 and an image acquisition device 26, and the image acquisition device 26 is a computer. In this embodiment, the camera 30 is a CMOS camera, which is installed right above the center of the infiltration container and can image the infiltration process of the foam, so as to observe the infiltration condition of the foam in real time. A computer is connected to the camera 30 and is capable of recording and storing data.
The process of carrying out the permeation test by using the foam permeation monitoring system of the embodiment is as follows:
(1) a foam permeation groove 3 in which an optical fiber sensor is embedded is constructed.
The diameter of the infiltration container in the embodiment is selected from 0.5-5 mm, and the porosity phi of the infiltration container is 0.45.
The optical fiber probe 14 is inserted into the preformed hole of the infiltration container and sealed by the sealant, so that the phenomenon that the foam flows out of the gap to influence the experimental effect is prevented.
(2) The foam-generating device 3 is adjusted to form a uniform and stable permeation field.
After the pressure regulator 12 is adjusted to a certain determined position based on the gas flowmeter 13, the outflow rate of the foam generating device 3 is continuously monitored, and when the foaming of the foaming agent is stable, a uniform and stable permeation field is considered to be formed.
(3) The host machine 9 monitors the temperature of the fiber optic probe 29 by injecting foam through the foam inlet 23 at the top of the infiltration vessel, thereby monitoring the seepage velocity of the foam in the soil particle pores. When seepage occurs around the optical fiber, the temperature of the optical fiber at the position is lower, the temperature change at the position can be amplified through the optical fiber amplifier 27, and further the seepage positioning and quantitative monitoring information can be obtained more obviously, so that the purpose of monitoring the seepage speed of the foam in the porous medium is achieved.
(4) The permeation process of the foaming agent is observed through a CMOS camera and recorded through a computer, so that the volume, position change and decay rule of the foam in the porous medium during permeation can be observed in real time.
(5) And recording the related test result, and performing subsequent image and data processing.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A foam permeation monitoring system based on optical fiber sensing is characterized by comprising:
the foam permeation device comprises a transparent permeation container used for filling soil particles, and the top end of the permeation container is connected with the foam generation device; an optical fiber detection module for monitoring the foam seepage speed is arranged in the seepage container;
and the observation device comprises an image acquisition device for acquiring foam permeation information, the image acquisition device is connected with an image processing device, and the image processing device records and stores the information.
2. The system for monitoring the permeability of the foam based on the optical fiber sensing is characterized in that the optical fiber detection module comprises a multimode optical fiber, the multimode optical fiber is connected with the heating device, and the multimode optical fiber is connected with a host through a pulse laser device.
3. The foam permeation monitoring system based on optical fiber sensing is characterized in that the optical fiber sensing module comprises an optical fiber sensor, and the optical fiber sensor is connected with a host through pulse laser equipment; the optical fiber sensor is inserted into the infiltration container from a preformed hole on one side of the infiltration container.
4. The foam permeation monitoring system based on optical fiber sensing according to claim 2 or 3, wherein the image acquisition device adopts an electron microscope, a plurality of observation windows for observation of the electron microscope are arranged at intervals in the axial direction of the permeation container, and a test strip is arranged on one side of each observation window.
5. The foam infiltration monitoring system based on fiber optic sensing of claim 2, wherein the multimode fiber is arranged in an S-shape within the infiltration vessel.
6. The system for monitoring foam permeation based on optical fiber sensing according to claim 2 or 3, wherein the image acquisition device adopts a camera.
7. The foam permeation monitoring system based on optical fiber sensing of claim 2 or 5, wherein a bracket is installed at the bottom of the permeation container, a tray for supporting soil particles is placed above the bracket, and air holes are formed in the surface of the tray.
8. The foam permeation monitoring system based on optical fiber sensing of claim 3, wherein a plurality of columns with vertical axes are distributed in the permeation container, and one ends of the columns are connected into a whole through a connecting part.
9. A method for monitoring foam permeation based on optical fiber sensing, which is characterized by using the monitoring system of claim 2, and comprises the following steps:
arranging the multimode optical fiber in an S shape in a penetration container, and filling soil body particles into the penetration container;
adjusting the foam generating device to form a uniform and stable permeation field, and injecting foam through a foam inlet at the top of the permeation container;
monitoring the temperature of the multimode optical fiber through a host to monitor the seepage velocity of foam in the pores of soil particles;
after the time is set, heating the multimode optical fiber by a heating device;
and observing the foam permeation process through an observation window by an electron microscope, and recording and processing data by an image processing device.
10. A method for monitoring foam permeation based on optical fiber sensing, which is characterized by using the monitoring system of claim 3, and comprises the following steps:
inserting a probe of the optical fiber sensor into a preformed hole of the infiltration container, and sealing by using a sealant;
adjusting the foam generating device to form a uniform and stable permeation field, and injecting foam through a foam inlet at the top of the permeation container;
monitoring the temperature of the optical fiber sensor through a host to monitor the seepage velocity of the foam in the pores of the soil particles;
the camera observes the foaming agent permeation process, and the image processing device records and processes data.
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