CN108007779B - Sensing optical cable and soil body deformation coupling testing device - Google Patents
Sensing optical cable and soil body deformation coupling testing device Download PDFInfo
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- CN108007779B CN108007779B CN201711431938.9A CN201711431938A CN108007779B CN 108007779 B CN108007779 B CN 108007779B CN 201711431938 A CN201711431938 A CN 201711431938A CN 108007779 B CN108007779 B CN 108007779B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/062—Special adaptations of indicating or recording means with mechanical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0605—Mechanical indicating, recording or sensing means
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Abstract
The invention discloses a device for testing the deformation coupling property of a sensing optical cable and a soil body, which comprises an experiment module, a pressurizing module and a measuring module for measuring and acquiring data, wherein the experiment module comprises a container for packaging a soil sample, the sensing optical cable and a drawing device which are arranged in the sample, and two ends of the sensing optical cable in the length direction are respectively connected with the drawing device; the pressurizing module comprises a high-pressure surrounding chamber for accommodating the container and a high-pressure environment supply device; the invention has simple structure, convenient operation, good effect and low cost, and can effectively carry out the coupling test research between the sensing optical cable and the deformation of the deep soil body; can simulate the changing deep soil texture and soil mechanics environment; the tester has the advantages of simple structure, low cost, suitability for places such as laboratories, construction sites and the like, and convenience and rapidness in testing.
Description
Technical Field
The invention relates to the technical field of rock-soil body deformation monitoring, in particular to a device for testing the deformation coupling of a sensing optical cable and a soil body and a working method thereof.
Background
Deformation monitoring of geotechnical bodies is an important research topic in the fields of geotechnical engineering and geological engineering. The current technologies for monitoring deformation of rock-soil mass mainly include a point-type monitoring technology represented by a traditional electromechanical sensor and a distributed monitoring technology represented by an optical fiber sensing technology. Traditional electromechanical sensors include inclinometers, total stations, strain gauges and the like, the sensors are easy to leak and corrode and have low survival rate, and cannot meet the monitoring requirements of large area and long distance, and the optical fiber sensing technology has started to be widely applied in the fields of geological disasters, geotechnical engineering such as tunnels and pile foundations due to the characteristics of full distribution, long distance, interference resistance, corrosion resistance, good matching and the like.
The optical fiber sensing technology is a novel monitoring technology which takes optical fiber as a medium and light as a carrier and is rapidly developed in the 80 th of the 20 th century. In the aspect of geological and geotechnical engineering deformation monitoring application, the sensing optical cables are arranged in the geotechnical body to construct a distributed monitoring network, so that distributed monitoring of deformation of the geotechnical body is realized.
The existing optical cable laying mode is divided into a surface pasting mode and a direct burying mode. Deformation monitoring of side slopes, ground settlement, ground cracks, coal seam mining overburden rocks and the like is generally realized by adopting direct buried layout through groove detection or drilling and the like. For direct buried arrangement, the deformation coupling of the direct buried optical cable and the surrounding soil body to be detected is a key factor for determining the effectiveness of the monitoring result. Because underground geological conditions are complex and high in concealment, and the lateral soil pressure in a drilled hole can be increased continuously along with the increase of the depth, the control of the interaction mechanism and the coupling between the direct-buried optical cable and the surrounding soil body to be detected is of great importance. However, the existing method lacks relevant test verification about the deformation coupling problem between the sensing optical cable and the surrounding soil body due to the lack of a corresponding lateral confining pressure pressurizing device.
Disclosure of Invention
The invention aims to provide a device and an analysis method for testing the coupling performance of deformation of a sensing optical cable and a soil sample, which effectively solve the problem of the coupling test between the deformation of the sensing optical cable and a deep soil body.
The device for testing the deformation coupling performance of the sensing optical cable and the soil body is characterized by comprising an experiment module, a pressurizing module and a measuring module for measuring and acquiring data, wherein the experiment module comprises a container for packaging a soil sample, a drawing device and the sensing optical cable arranged in the sample, and two ends of the sensing optical cable in the length direction are respectively connected with the drawing device; the pressurizing module comprises a high-pressure surrounding chamber for accommodating the container and a high-pressure environment supply device.
Preferably, the high-pressure environment supply device is a hydraulic pressure boosting device.
Further preferably, the hydraulic pressure boosting device comprises a hydraulic pump for providing high-pressure liquid, a hydraulic pipe arranged between the hydraulic pump and the high confining pressure chamber, and an outlet pressure gauge for measuring the pressure of the liquid.
Preferably, the drawing device comprises a drawing device submodule and a clamp used for connecting the drawing device submodule and the sensing optical cable, and the drawing device submodule comprises a drawing frame, a pulley and a drawing source. The sensing optical cable extends out of the high-pressure confining chamber, and the drawing device sub-module is arranged on the outer side of the high-pressure confining chamber.
Further preferably, the drawing source is a weight or a stepping motor.
Further preferably, the sub-module of the drawing device further comprises a measuring tool for recording the displacement of the clamp.
Further preferably, the measuring tool is a micrometer.
Preferably, the experiment module further comprises a soil sampler, and at least two soil samplers are respectively arranged at two ends of the container in the length direction.
Further preferably, the container is a heat shrink tube.
Further preferably, two ends of the high pressure surrounding chamber are sealed by two flange plates, and the two soil sample pressers are respectively connected with the two flange plates.
The invention also provides a method for testing the deformation coupling of the sensing optical cable and the soil body, which is characterized by comprising the following steps of:
filling a soil sample into a heat-shrinkable tube, burying a sensing optical cable in the soil sample, and compacting in layers; placing the heat-shrinkable tube into a high-pressure confining chamber, wherein soil sample pressers are sleeved at two ends of the heat-shrinkable tube and are respectively fixed on the flange plate; fixing the two flange plates with the high-pressure surrounding chamber respectively, and connecting the sensing optical cable with a drawing device submodule through a clamp after the sensing optical cable sequentially penetrates through the soil sampler, the flange plates and the high-pressure surrounding chamber; connecting the sensing optical cable with the measuring module; and an oil pressure pipe on the oil pressure pump and the high pressure confining chamber.
And step two, pressurizing and measuring. And starting the oil pressure pump, pressurizing the high confining pressure chamber and performing a drawing test on the soil sample.
The drawing test means that after each drawing is stable, the reading of a dial indicator is recorded, and the data of demodulation equipment is collected until the optical cable slips off the soil sample; calculating the ratio k of the cable strain integral value ^ epsilon dl to the clamp displacement S recorded by the dial indicator, namely
And obtaining the coupling coefficient k of the sensing optical cable and the soil deformation. The quality of the deformation coupling of the sensing optical cable and the soil body can be evaluated according to corresponding standards. And repeating the first step and the second step for multiple times under different pressures to obtain the coupling data under different pressures. And (4) selecting heat shrinkable tubes with different diameters, and repeating the first step and the second step to obtain accurate data.
The invention has the following beneficial effects:
the invention has simple structure, convenient operation, good effect and low cost, and can effectively carry out the coupling test research between the sensing optical cable and the deformation of the deep soil body. Can simulate the changing deep soil texture and soil mechanics environment. The tester has simple structure and low cost, and is suitable for laboratories, construction sites and other fields. The test is convenient and quick.
Drawings
Fig. 1 is a side view of a device for testing the coupling between a sensing optical cable and a soil sample deformation in example 1 of the present invention.
Fig. 2 is a diagram showing a corresponding relationship between the optical cable drawing displacement and the monitoring displacement under the action of zero confining pressure in embodiment 1 of the present invention.
FIG. 3 is a graph showing the relationship between the drawing displacement and the monitoring displacement of the optical cable under a confining pressure of 2MPa in example 1 of the present invention.
Wherein, 1-a pressurizing module; 2-an experimental module; 3-a measurement module; 4-hydraulic pump, 5-outlet pressure gauge, 6-hydraulic pipe, 7-dial indicator, 8-clamp, 9-drawing device submodule, 10-heat shrink pipe, 11-soil sample, 12-soil sample pressing device, 13-flange plate, 14-high confining pressure chamber, 15-sensing optical cable, 16-drawing frame, 17-pulley, 18-drawing source, 19-BOTDA demodulation equipment and 20-computer with data analysis software.
Detailed Description
The invention is described in detail below with reference to the drawings and examples.
Example 1
As shown in fig. 1, the device for testing the deformation coupling of the sensing optical cable and the soil body comprises a pressurizing module 1, an experiment module 2 and a measuring module 3.
The pressurizing module 1 comprises a hydraulic pump 4, an outlet pressure gauge 5 and a hydraulic pipe 6. The hydraulic pipe 6 is connected with the hydraulic pump 4 and the outlet pressure gauge 5, and the hydraulic pipe 6 is also connected with the high confining pressure chamber 14; the model 4 of the hydraulic pump selected in the test is a CZB6302 type electric oil pump, and the pressure range is 2-63 MPa. The module is used for controlling the hydraulic pressure in the high-pressure confining chamber 14 and can provide the hydraulic pressure of 2-20 MPa.
The experiment module 2 comprises a dial indicator 7, a clamp 8, a drawing device submodule 9, a heat shrinkable tube 10, a soil sample 11, a soil sample pressing device 12, a flange plate 13, a high confining pressure chamber 14, a sensing optical cable 15, a drawing frame 16, a pulley 17 and a drawing source 18. The heat shrinkable tube 10 is filled with a soil sample 11 with a specific mixture ratio, and a sensing optical cable 15 is buried inside the heat shrinkable tube; the soil sample pressing device 12 is matched with the heat shrinkable tube 10 and the flange 13 for use, the soil sample pressing device 12 is respectively fixed at two ends of the heat shrinkable tube 10 and is connected with the flange 13, a hole is formed in the center of the soil sample pressing device 12, and the sensing optical cable 15 can move in the hole; the drawing device submodule 9 comprises a drawing frame 16, a pulley 17 and a drawing source 18; when the drawing test is carried out, the dial indicator 7 is used for recording the displacement of the clamp 8, and the sub-module 9 of the drawing device is connected with the clamp 8 for the sensing optical cable. The heat shrinkable tube 10 is selected from three geotechnical test specifications of 39.1mm, 61.8mm and 101mm in diameter; selecting a soil body to be tested from the soil sample 11; the three specifications of the soil sample presser 12 correspond to the diameter of the heat shrinkable tube 10; the size phi of the high-confining-pressure inner chamber is 150mm plus 1000mm, and the high-confining-pressure inner chamber can bear 20MPa of inner pressure; the sensing optical cable 15 is a metal-based cable-shaped optical cable with the diameter of 5mm and the rigidity meeting the drawing test requirement; the source 18 selects a number of weights (providing a constant drawing force) or stepper motors (providing a constant drawing displacement). The module can be used for providing the drawing force for the deformation coupling test of the sensing optical cable 15 and the soil body under high ambient pressure and measuring the displacement S of the clamp 8.
The measurement module 3 comprises a BOTDA demodulation device 19, a computer 20 with data analysis software. The test BOTDA demodulation equipment 19 is an NBX-6050A type BOTDA demodulator, and the spatial resolution is 5 cm. The module is used for acquiring and analyzing strain data of the optical cable in the process of drawing the optical cable and the soil body.
A method for testing deformation coupling of a sensing optical cable and a soil body comprises the following steps:
step one, installing an instrument. Selecting a test soil sample 11, respectively filling the test soil sample into a 39.1 mm-diameter heat-shrinkable tube 10, burying a metal-based cable-shaped optical cable inside, and compacting in layers; placing the prepared soil sample 11 into a high confining pressure chamber 14, sleeving two ends of a heat shrink tube 10 outside a soil sample presser 12, sealing by using epoxy glue, and fixing on a flange plate 13; fixing the flange plate 13 on the high-pressure confining chamber 14 by using screws, protecting the metal-based cable-shaped optical cable in the fixing process, and leading the metal-based cable-shaped optical cable out of the high-pressure confining chamber 14 through the small hole in the soil sampler 12; a clamp 8, a dial indicator 7 and a drawing device submodule 9 are connected above the flange plate 13; connecting the metal-based cable-shaped optical cable with a BOTDA demodulation device 19, wherein the BOTDA demodulation device is connected with a computer; the oil pressure pipe of the oil pressure pump is connected to the high pressure surrounding chamber 14.
And step two, pressurizing and measuring. Starting an oil pressure pump, and respectively carrying out soil sample drawing tests under different hydraulic pressures according to the hydraulic pressure grades of 0MPa (comparison group), 2MPa, 4MPa, 6MPa, 8MPa, 10MPa, 12MPa, 14MPa, 16MPa, 18MPa and 20 MPa. After each drawing is stable, recording the reading of the dial indicator 7 and collecting the data of the BOTDA demodulation equipment 19 until the optical cable slips off the soil sample 11; calculating the ratio k of the strain integral value ^ epsilon dl of the metal-based cable-shaped optical cable to the displacement S of the clamp 8 recorded by the dial indicator 7, namely
The quality of the deformation coupling of the sensing optical cable and the soil body can be evaluated according to corresponding standards.
And step three, selecting heat-shrinkable tubes 10 with the diameters of 61.8mm and 10.1mm respectively, and repeating the step one and the step two.
The test can explore the drawing test coupling condition of the sensing optical cable and the soil body under different confining pressures and the influence of the diameter of the soil sample 11 on the drawing test deformation coupling of the sensing optical cable 15 and the soil body.
The following describes a specific implementation process of the testing method by taking a sandy soil measurement sensing optical cable and soil deformation coupling test as an example, but the application range of the testing method is not limited to this. The strain demodulation equipment for the deformation coupling test is not limited to the BOTDA demodulation equipment, and Rayleigh OTDR and Brillouin frequency domain measurement technologies such as BOFDA and the like can be adopted according to the measurement range.
Deformation coupling test of sensing optical cable and soil body under high confining pressure
Step one, instrument installation:
selecting Suzhou sandy soil (d)10＝0.115mm，d50＝0.331mm，d60＝0.371mm，Cu3.239), filling the mixture into a 61.8 mm-diameter heat-shrinkable tube 10, burying a metal-based cable-shaped optical cable inside, and compacting in layers; placing the prepared soil sample 11 into a high confining pressure chamber 14, sleeving two ends of a heat shrink tube 10 outside a soil sample presser 12, sealing by using epoxy glue, and fixing on a flange plate 13; the flange 13 is fixed by screwsThe high-pressure confining chamber 14 is used for protecting the metal-based cable-shaped optical cable in the fixing process, and the metal-based cable-shaped optical cable is led out of the high-pressure confining chamber 14 through the small holes in the soil sample presser 12; a clamp 8, a dial indicator 7 and a drawing device submodule 9 are connected above the flange plate 13; connecting the metal-based cable-shaped optical cable with a BOTDA demodulation device 19, wherein the BOTDA demodulation device 19 is connected with a computer; the hydraulic pipe of the hydraulic pump is connected to the high pressure surrounding chamber 14.
Step two, pressurizing and measuring:
starting an oil pressure pump, and respectively carrying out drawing tests on the soil sample 11 under different hydraulic pressures according to the hydraulic pressure grades of 0MPa (comparison group), 2MPa, 4MPa, 6MPa, 8MPa, 10MPa, 12MPa, 14MPa, 16MPa, 18MPa and 20 MPa. After each drawing is stable, recording the reading of the dial indicator 7 and collecting the data of the BOTDA demodulation equipment 19 until the optical cable slips off the soil sample 11; calculating the ratio k of the strain integral value ^ epsilon dl of the metal-based cable-shaped optical cable to the displacement S of the clamp 8 recorded by the dial indicator 7, namely
And evaluating the quality of the deformation coupling of the sensing optical cable and the soil body according to corresponding standards.
FIG. 2 and FIG. 3 are comparison graphs of sensing data and deformation coupling of optical cables with the pressure of 0MPa and 2MPa, and FIG. 2 is a corresponding relation between optical cable drawing displacement and monitoring displacement under the action of zero confining pressure; FIG. 3 is a corresponding relationship between the optical cable drawing displacement and the monitoring displacement under the confining pressure of 2 MPa. As can be seen from fig. 2, under the action of zero confining pressure, the k value of the optical cable is maintained at about 0.4, the difference between the monitoring data of the optical cable and the drawing displacement is large, and the deformation coupling property between the sensing optical cable and the soil body is poor; as can be seen from FIG. 3, when the optical cable is under the confining pressure of 2MPa, the k value is maintained at about 0.9, which indicates that the monitoring displacement of the optical cable and the drawing displacement have extremely high coincidence under the high confining pressure, and the deformation coupling of the sensing optical cable and the soil body is remarkably improved.
Through the device and the working method, the deformation coupling performance of the sensing optical cable and the soil body under different confining pressures can be conveniently and effectively evaluated through the calculation and analysis of the k value.
Claims (12)
1. A method for testing deformation coupling of a sensing optical cable and a soil body is characterized by comprising the following steps:
filling a soil sample into a container for packaging the soil sample, burying a sensing optical cable in the soil sample, and compacting in layers; placing the container into a high-pressure confining chamber, wherein soil sample pressers are sleeved at two ends of the container and are respectively fixed on the flange plates; fixing the two flange plates with the high-pressure surrounding chamber respectively, and connecting the sensing optical cable with a drawing device submodule through a clamp after the sensing optical cable sequentially penetrates through the soil sampler, the flange plates and the high-pressure surrounding chamber; connecting the sensing optical cable with a measuring module; an oil pressure pipe on an oil pressure pump and the high pressure confining chamber are arranged;
pressurizing and measuring; starting the oil pressure pump, pressurizing the high confining pressure chamber and performing a drawing test on the soil sample; after each drawing is stable, recording dial indicator reading and acquiring demodulation equipment data until the optical cable slips off the soil sample; and calculating the ratio k of the optical cable strain integral value ^ epsilon dl to the clamp displacement S recorded by the dial indicator, so as to obtain the coupling coefficient k of the sensing optical cable and the soil deformation.
2. The method for testing the deformation coupling performance of the sensing optical cable and the soil body according to claim 1, wherein in the second step, soil sample drawing tests under different hydraulic pressures are respectively carried out according to the hydraulic pressure grades of 0MPa, 2MPa, 4MPa, 6MPa, 8MPa, 10MPa, 12MPa, 14MPa, 16MPa, 18MPa and 20 MPa.
3. The method for testing the deformation coupling performance of the sensing optical cable and the soil body according to claim 1 or 2, wherein heat-shrinkable tubes with the diameters of 61.8mm and 10.1mm are respectively selected, and the step one and the step two are repeated.
4. The device for testing the deformation coupling performance of the sensing optical cable and the soil body is characterized by comprising an experiment module, a pressurizing module and a measuring module for measuring and acquiring data, wherein the experiment module comprises a container for packaging a soil sample, the sensing optical cable and a drawing device which are arranged in the sample, and two ends of the sensing optical cable in the length direction are respectively connected with the drawing device; the pressurizing module comprises a high-pressure surrounding chamber for accommodating the container and a high-pressure environment supply device, and the testing method comprises the following steps: filling a soil sample into a container for packaging the soil sample, burying a sensing optical cable in the soil sample, and compacting in layers; placing the container into a high-pressure confining chamber, wherein soil sample pressers are sleeved at two ends of the container and are respectively fixed on the flange plates; fixing the two flange plates with the high-pressure surrounding chamber respectively, and connecting the sensing optical cable with a drawing device submodule through a clamp after the sensing optical cable sequentially penetrates through the soil sampler, the flange plates and the high-pressure surrounding chamber; connecting the sensing optical cable with the measuring module; an oil pressure pipe on an oil pressure pump and the high pressure confining chamber are arranged;
pressurizing and measuring; starting the oil pressure pump, pressurizing the high confining pressure chamber and performing a drawing test on the soil sample; after each drawing is stable, recording dial indicator reading and acquiring demodulation equipment data until the optical cable slips off the soil sample; and calculating the ratio k of the optical cable strain integral value ^ epsilon dl to the clamp displacement S recorded by the dial indicator, so as to obtain the coupling coefficient k of the sensing optical cable and the soil deformation.
5. The apparatus for testing soil deformation coupling property of sensing optical cable according to claim 4, wherein the high pressure environment supply device is a hydraulic pressure boosting device.
6. The device for testing the deformation coupling property of the optical sensing cable and the soil body according to claim 5, wherein the hydraulic pressurizing device comprises a hydraulic pump for providing high-pressure liquid, a hydraulic pipe arranged between the hydraulic pump and the high confining pressure chamber, and an outlet pressure gauge for measuring the pressure of the liquid.
7. The apparatus for testing the coupling between the sensing optical cable and the soil deformation according to claim 4, wherein the pulling device comprises a pulling device sub-module and a clamp for connecting the pulling device sub-module and the sensing optical cable, and the pulling device sub-module comprises a pulling frame, a pulley and a pulling source.
8. The apparatus for testing the coupling between the optical sensing cable and the soil deformation according to claim 7, wherein the drawing source is a weight or a stepping motor.
9. The apparatus for testing the coupling between the optical sensing cable and the soil deformation according to claim 7, wherein the sub-module of the pulling apparatus further comprises a measuring tool for recording the displacement of the clamp.
10. The apparatus for testing soil deformation coupling property of sensing optical cable according to claim 9, wherein the measuring tool is a micrometer.
11. The apparatus for testing the coupling between the sensing optical cable and the soil deformation according to claim 4, wherein the experiment module further comprises soil sample injectors, and at least two of the soil sample injectors are respectively disposed at two ends of the container.
12. The apparatus for testing soil deformation coupling property of sensing optical cable according to claim 11, wherein two ends of the high pressure chamber are sealed by two flanges, and the two soil sample pressing devices are respectively connected to the two flanges.
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| CN110057750A (en) * | 2019-05-23 | 2019-07-26 | 南京大学 | A kind of OFDR distributed sensing optical cable and Soil Interface Experimental Study On Mechanical Properties method and apparatus based on transparent soil |
| CN111795652A (en) * | 2020-07-09 | 2020-10-20 | 南京大学 | Method and equipment for measuring deformation coordination of direct-buried sensing optical cable and soil body |
| CN114199679B (en) * | 2021-12-09 | 2024-05-28 | 南京大学 | Distributed in-situ test method for frozen soil multi-physical parameters based on optical fiber drawing |
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| CN108007779A (en) | 2018-05-08 |
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