CN113932944A - System and method for monitoring displacement, strain and temperature in soil - Google Patents
System and method for monitoring displacement, strain and temperature in soil Download PDFInfo
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- 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
- G01K11/322—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 using Brillouin scattering
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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
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention provides a system and a method for monitoring displacement, strain and temperature in the soil, and relates to the field of rock and soil intelligent monitoring. The method comprises the following steps: the geogrid assembly comprises at least two layers of geogrids and connecting frames, and the geogrids are connected through the connecting frames; the sensor assembly is arranged on the geogrid assembly and used for detecting displacement, strain and temperature data inside the soil; the transmission terminal is used for transmitting data detected by the sensor assembly; the power supply device supplies power to the transmission terminal. The invention aims to provide a system and a method for monitoring displacement, strain and temperature in the soil, which are used for solving the problems that the coupling between a sensing optical fiber and a soil body to be detected is insufficient and the change monitoring in the soil with a certain depth is difficult to realize in the prior art, can effectively carry out long-term effective remote monitoring and early warning on geological disasters such as landslides and the like, and greatly reduce life and property loss.
Description
Technical Field
The invention relates to the field of rock and soil intelligent monitoring, in particular to a system and a method for monitoring displacement, strain and temperature in soil.
Background
The occurrence of geological disasters such as landslide, collapse, debris flow and the like has great influence on the life and property safety of people, and in order to ensure the safety of rock-soil bodies and buildings attached to the rock-soil bodies, the real-time monitoring of three-dimensional displacement fields in the soil bodies is realized, the monitoring results are analyzed and predicted, and the intelligent early warning and control of geotechnical engineering are realized. Traditional monitoring instruments, such as a joint meter, a level gauge, a GPS and the like are mainly attached to the surface of a rock-soil body, cannot monitor the internal stress and deformation of the rock-soil body, are greatly influenced by the external environment, and are limited in application range. In recent years, with the application of technologies such as optical fiber sensing in the field of geotechnical engineering, monitoring of internal changes of a geotechnical body becomes possible, and the real-time performance and intelligence of monitoring are improved.
At present, main instruments for monitoring the interior of a soil body comprise a inclinometer, a sensing probe and the like, but researches show that the shear strength of an interface between a sensing optical fiber and the soil body is gradually reduced along with the increase of the embedding depth. A monitoring scheme capable of solving the problem of coupling between the sensing optical fiber and the soil body to be detected is urgently needed. At present, the method for enhancing the coupling between the sensing optical fiber and the measured soil body by changing the form of the sensing optical fiber and increasing the friction of the surface is a good solution.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a system and a method for monitoring displacement, strain and temperature in the ground, which are used for solving the problems that the coupling between the sensing optical fiber and the measured soil body is insufficient and the monitoring of the change in the ground at a certain depth is difficult to realize in the prior art.
To achieve the above and other related objects, the present invention provides a system for monitoring displacement, strain and temperature inside the earth, comprising:
the geogrid assembly comprises at least two layers of geogrids and connecting frames, and the geogrids are connected through the connecting frames;
a sensor assembly disposed on the geogrid assembly, the sensor assembly for detecting displacement, strain and temperature data within the earth;
the transmission terminal is used for transmitting the data detected by the sensor assembly;
and the power supply device supplies power to the transmission terminal.
Optionally, the geogrid and/or the connecting frame are made of carbon fiber.
Optionally, the geogrid and/or the connector frame are made by additive manufacturing techniques.
Optionally, the sensor assembly includes a distributed optical fiber strain sensor and a distributed optical fiber temperature sensor, and the distributed optical fiber strain sensor and the distributed optical fiber temperature sensor are disposed on the upper and lower outer surfaces of each layer of the geogrid and the outer surface of the connecting frame.
Optionally, the distributed optical fiber temperature sensor and the distributed optical fiber strain sensor are stacked together and the distributed optical fiber strain sensor is located between the geogrid and the distributed optical fiber temperature sensor.
Optionally, the distributed optical fiber temperature sensor and the distributed optical fiber strain sensor are arranged on the outer surface of the geogrid in an S shape, and the distributed optical fiber temperature sensor and the distributed optical fiber strain sensor cover all the intersections of the array on the geogrid.
Optionally, the sensor assembly further includes a tilt sensor disposed at a corner of the connecting frame.
Optionally, the transmission terminal includes a data processing unit, a bluetooth acquisition board and a cloud platform,
the data processing unit is respectively connected with the distributed optical fiber temperature sensor and the distributed optical fiber strain sensor;
the Bluetooth acquisition board is connected with the tilt angle sensor;
and the data processing unit and the Bluetooth acquisition board upload acquired data to the cloud platform.
Optionally, the cloud platform further comprises an intelligent early warning device, the cloud platform transmits the collected data to the intelligent early warning device, and when the value of the data parameter exceeds a set value of the system, the intelligent early warning device sends an alarm.
A method of using any one of the systems for monitoring displacement, strain and temperature within the earth, comprising:
the geogrid assembly and the sensor assembly are pre-buried in the ground with a certain depth, the geogrid deforms under the action of load in the ground, the distributed optical fiber strain sensor can detect strain variation delta epsilon, when the water level in the soil body changes, the distributed optical fiber temperature sensor can detect temperature variation delta T in the ground, a certain inclination angle is generated when the soil body slides, and the inclination angle sensor can detect rotation angle variation thetaiThe data processing unit and the Bluetooth acquisition board upload acquired data to the cloud platform for storage and calculation processing;
the Brillouin frequency shift amount of the optical fiber and the strain temperature of the optical fiber are in a linear relation, and the characteristic is utilized to realize the measurement of the internal strain and temperature of the soil body, namely delta vB＝CB,εΔε+CB,TΔ T, in the formula, Δ νBIs the amount of change in the Brillouin frequency shift of the optical fiber, CB,ε、CB,TRespectively, optical fiber strain and temperature coefficient; the angle variation obtained by the inclination angle sensor is the inclination angle of the soil body, and the horizontal displacement delta x of the soil body at the embedding depth of the structure body can be determined through a simple geometric formula, wherein the delta x is l multiplied by sin theta1In the formula, thetaiThe variation of the rotation angle measured by the tilt angle sensor is measured, and l is the tilt angle sensorThe length of the device;
the cloud platform is connected with the intelligent early warning device, and when the calculated data parameter value exceeds a system set value, the intelligent early warning device sends out an alarm.
As described above, the system and method for monitoring displacement, strain and temperature in the ground of the invention have at least the following advantages:
the geogrid assembly is formed by connecting at least two layers of geogrids through the connecting frame, and compared with the disadvantages that the geogrids with a plane structure in the prior art are not anti-sliding and are not tightly embedded with soil, the geogrid assembly is of a three-dimensional structure, so that the friction strength and the anti-sliding capacity of the geogrids and the soil are enhanced;
the sensor component designed in the invention is attached to the geogrid component, and due to the advantages of the three-dimensional structure of the geogrid component, the sensor component has the remarkable advantages of high sensitivity, strong anti-interference capability, long service life and the like, and realizes real-time monitoring on multiple parameters such as soil strain, temperature, displacement deformation and the like;
in addition, the measured data are collected and transmitted to the cloud platform for storage, calculation and analysis, the monitored data are evaluated in real time, an intelligent early warning device is additionally arranged, the detected data exceeding the set value of the system can be alarmed, long-term effective remote monitoring and early warning can be effectively carried out on geological disasters such as landslides, and the life and property losses are greatly reduced.
Drawings
FIG. 1 is a schematic view of the overall structure of a system for monitoring displacement, strain and temperature within the earth in accordance with the present invention;
FIG. 2 is a schematic view of the arrangement of distributed optical fiber temperature sensors and distributed optical fiber strain sensors on the surface of a geogrid according to the present invention;
FIG. 3 is a schematic view of the arrangement of the distributed optical fiber temperature sensor and the distributed optical fiber strain sensor on the surface of the connecting frame according to the present invention;
fig. 4 is a schematic view of the arrangement of the tilt sensor on the connecting frame according to the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 4. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The following examples are for illustrative purposes only. The various embodiments may be combined, and are not limited to what is presented in the following single embodiment.
Referring to fig. 1, the present invention provides a system for monitoring displacement, strain and temperature inside the earth, comprising: the geogrid assembly comprises at least two layers of geogrids 1 and connecting frames 2, and the geogrids 1 of all layers are connected through the connecting frames 2; the sensor assembly is arranged on the geogrid assembly and is used for detecting displacement, strain and temperature data of the interior of the ground; the transmission terminal is used for transmitting the data detected by the sensor assembly; the power supply device supplies power to the transmission terminal. In this embodiment, the geogrid subassembly includes two-layer geogrid 1, and is two-layer geogrid 1 passes through link 2 is connected, power supply unit can select for use solar cell panel, more energy saving. The geogrid 1 and/or the connecting frame 2 are made by additive manufacturing techniques. Compared with the defects that the geogrid 1 of a planar structure in the prior art is not anti-sliding and is not tightly embedded with a soil body, the geogrid component is of a three-dimensional structure, and the friction strength and the anti-sliding capacity of the geogrid 1 and the soil body are enhanced.
In this embodiment, the geogrid 1 and/or the connecting frame 2 are made of carbon fiber. In this embodiment geogrid 1 with link 2 all can adopt carbon fiber, because of carbon fiber is lighter, has good ductility and corrosion protection ability, can make geogrid subassembly body can demonstrate better operating condition in the inside earth, guarantees that its system can realize data sampling accurately, steadily. In practical applications, the geogrid 1 can also be a uniaxial tensile plastic geogrid, a biaxial tensile plastic geogrid, a triaxial tensile plastic geogrid, a warp-knitted geogrid, a welded geogrid or an injection-molded connecting geogrid, or any combination of the above types. The projection shape of the grid holes in the geogrid 1 is a triangle, a quadrangle, a pentagon, a hexagon, an octagon, or any combination of the above shapes, and in this embodiment, as shown in fig. 2, the projection shape of the grid holes in the geogrid 1 is a regular quadrangle.
In this embodiment, referring to fig. 2 and 3, the sensor assembly includes a distributed optical fiber strain sensor 31 and a distributed optical fiber temperature sensor 32, and the distributed optical fiber strain sensor 31 and the distributed optical fiber temperature sensor 32 are disposed on the upper and lower outer surfaces of each layer of the geogrid 1 and the outer surface of the connecting frame 2. The distributed optical fiber strain sensors 31 and the distributed optical fiber temperature sensors 32 can be respectively arranged on the outer surfaces of the upper layer and the lower layer of the carbon fiber geogrid 1 and the outer surface of the connecting frame 2 from inside to outside by using epoxy resin glue, the distributed optical fiber strain sensors 31 are straightened when the distributed optical fiber strain sensors are pasted, acting force is not applied to the distributed optical fiber temperature sensors 32, the structure realizes multi-point monitoring of a three-dimensional strain field and a temperature field in a soil body, and even if part of the optical fiber sensors are separated from the geogrid assembly, the system can still work normally. The sensor component designed in the invention is attached to the geogrid component, and due to the advantages of the three-dimensional structure of the geogrid component, the sensor component has the remarkable advantages of high sensitivity, strong anti-interference capability, long service life and the like, and realizes real-time monitoring on multiple parameters of soil strain, temperature, displacement deformation and the like.
In this embodiment, referring to fig. 2, the distributed optical fiber temperature sensor 32 and the distributed optical fiber strain sensor 31 are stacked together, and the distributed optical fiber strain sensor 31 is located between the geogrid 1 and the distributed optical fiber temperature sensor 32. The distributed optical fiber temperature sensor 32 and the distributed optical fiber strain sensor 31 are stacked together so that two sensors are arranged at the same positions of the upper outer surface and the lower outer surface of the geogrid 1 and the outer surface of the connecting frame 2, strain variation and temperature variation of the corresponding same position can be measured, a variable control function is achieved, meanwhile, the distributed optical fiber strain sensor 31 is located between the geogrid 1 and the distributed optical fiber temperature sensor 32, namely the distributed optical fiber strain sensor 31 is closer to the surfaces of the geogrid 1 and the connecting frame 2, the measured strain variation result is more accurate, the distributed optical fiber temperature sensor 32 is closer to the external environment, and the temperature variation of the external environment can be measured better and more accurately.
In this embodiment, referring to fig. 2, the distributed optical fiber temperature sensor 32 and the distributed optical fiber strain sensor 31 are arranged on the outer surface of the geogrid 1 in an S-shape, and the distributed optical fiber temperature sensor 32 and the distributed optical fiber strain sensor 31 cover all the intersections of the array on the geogrid 1. The distributed optical fiber temperature sensors 32 and the distributed optical fiber strain sensors 31 are arranged in an S shape to cover array cross points on the surface of the geogrid 1, so that all contact deformation and temperature ranges of the geogrid 1 and a tested soil sample can be detected by the distributed optical fiber temperature sensors 32 and the distributed optical fiber strain sensors 31, and the measurement data result of the system is more comprehensive and more accurate.
In this embodiment, referring to fig. 4, the sensor assembly further includes an inclination sensor 33, the inclination sensor 33 may be a Flex-type inclination sensor 33, the inclination sensor 33 is disposed at a corner of the connecting frame 2, and a change amount of the corner measured by the inclination sensor 33 is an inclination angle in the soil body.
In this embodiment, referring to fig. 1, the transmission terminal includes a data processing unit 4, a bluetooth acquisition board 5, and a cloud platform 6, where the data processing unit 4 is connected to the distributed optical fiber temperature sensor 32 and the distributed optical fiber strain sensor 31 respectively; the Bluetooth acquisition board 5 is connected with the inclination angle sensor 33; the data processing unit 4 and the Bluetooth acquisition board 5 upload acquired data to the cloud platform 6. The data processing unit 4 comprises a dynamic data acquisition module and a dynamic data transmission module, and the bluetooth acquisition board 5 comprises a bluetooth data acquisition module and a bluetooth data transmission module. The distributed optical fiber temperature sensor 32 and the distributed optical fiber strain sensor 31 are connected with the data processing unit 4 through optical fiber leads, and the tilt sensor 33 is wirelessly connected with the bluetooth acquisition board 5. The data processing unit 4 and the Bluetooth acquisition board 5 upload acquired data to the cloud platform 6 for storage, analysis, calculation and processing.
In this embodiment, the cloud platform 6 further transmits the collected data to the intelligent early warning device, and when the calculated data parameter value exceeds a system set value, the intelligent early warning device gives an alarm. Therefore, the invention can evaluate the monitoring data in real time, can send out an alarm to the detection data exceeding the set value of the system, can effectively carry out long-term effective remote monitoring and early warning to geological disasters such as landslide and the like, and greatly reduces life and property loss.
In this embodiment, a method of monitoring an earth using any of the above-described methodsA method of partially displacing, straining and temperature system comprising: the geogrid assembly and the sensor assembly are pre-buried in the ground with a certain depth, the geogrid 1 deforms under the action of a load in the ground, the distributed optical fiber strain sensor 31 can detect strain variation delta epsilon, when the water level in the soil body changes, the distributed optical fiber temperature sensor 32 can detect temperature variation delta T in the ground, a certain inclination angle is generated when the soil body slides, and the inclination angle sensor 33 can detect the change of a rotation angle thetaiThe data processing unit 4 and the Bluetooth acquisition board 5 upload acquired data to the cloud platform 6 for storage and calculation processing;
the Brillouin frequency shift amount of the optical fiber and the strain temperature of the optical fiber are in a linear relation, and the characteristic is utilized to realize the measurement of the internal strain and temperature of the soil body, namely delta vB＝CB,εΔε+CB,TΔ T, in the formula, Δ νBIs the amount of change in the Brillouin frequency shift of the optical fiber, CB,ε、CB,TRespectively, optical fiber strain and temperature coefficient; the angle change obtained by the inclination angle sensor 33 is the inclination angle of the soil body, and the horizontal displacement Δ χ of the soil body at the embedding depth of the structure body can be determined through a simple geometric formula, wherein Δ χ is l × sin θ1In the formula, thetaiThe variation of the rotation angle measured by the tilt sensor 33, i is the length of the tilt sensor 33;
the cloud platform 6 is connected with the intelligent early warning device, and when the calculated data parameter value exceeds a system set value, the intelligent early warning device gives an alarm.
In summary, the invention provides a system and a method for monitoring displacement, strain and temperature in the soil, which overcome the problem of insufficient coupling between sensing optical fibers and the soil body to be detected in the prior art, the geogrid assembly is formed by connecting at least two layers of geogrids through the connecting frame, and compared with the disadvantages that the geogrids with planar structures in the prior art are not anti-slip and are not tightly embedded with the soil body, the geogrid assembly is of a three-dimensional structure, so that the friction strength and the anti-slip capability of the geogrids and the soil body are enhanced. The sensor component is attached to the geogrid component, and due to the advantages of the three-dimensional structure of the geogrid component, the sensor component has the remarkable advantages of high sensitivity, strong anti-interference capability, long service life and the like, and real-time monitoring of multiple parameters such as soil body strain, temperature, displacement deformation and the like is realized. In addition, the measured data are collected and transmitted to the cloud platform for storage, calculation and analysis, the monitored data are evaluated in real time, an intelligent early warning device is additionally arranged, the detected data exceeding the set value of the system can be alarmed, long-term effective remote monitoring and early warning can be effectively carried out on geological disasters such as landslides, and the life and property losses are greatly reduced. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A system for monitoring displacement, strain and temperature within the earth, comprising:
the geogrid assembly comprises at least two layers of geogrids and connecting frames, and the geogrids are connected through the connecting frames;
a sensor assembly disposed on the geogrid assembly, the sensor assembly for detecting displacement, strain and temperature data within the earth;
the transmission terminal is used for transmitting the data detected by the sensor assembly;
and the power supply device supplies power to the transmission terminal.
2. A system for monitoring displacement, strain and temperature within the earth as claimed in claim 1 wherein:
the geogrid and/or the connecting frame are made of carbon fiber materials.
3. A system for monitoring displacement, strain and temperature within the earth as claimed in claim 1 wherein:
the geogrid and/or the connecting frame are made by additive manufacturing techniques.
4. A system for monitoring displacement, strain and temperature within the earth as claimed in claim 1 wherein:
the sensor assembly comprises distributed optical fiber strain sensors and distributed optical fiber temperature sensors, wherein the distributed optical fiber strain sensors and the distributed optical fiber temperature sensors are arranged on the upper outer surface and the lower outer surface of each layer of the geogrid and the outer surface of the connecting frame.
5. A system for monitoring displacement, strain and temperature within the earth as claimed in claim 4 wherein:
the distributed optical fiber temperature sensor and the distributed optical fiber strain sensor are stacked together with the distributed optical fiber strain sensor located between the geogrid and the distributed optical fiber temperature sensor.
6. A system for monitoring displacement, strain and temperature within the earth as claimed in claim 5 wherein:
the distributed optical fiber temperature sensors and the distributed optical fiber strain sensors are arranged on the outer surface of the geogrid in an S shape, and the distributed optical fiber temperature sensors and the distributed optical fiber strain sensors cover all the cross points of the array on the geogrid.
7. A system for monitoring displacement, strain and temperature within the earth as claimed in claim 4 wherein:
the sensor assembly further comprises a tilt sensor arranged at a corner position of the connecting frame.
8. A system for monitoring displacement, strain and temperature within the earth as claimed in claim 7 wherein:
the transmission terminal comprises a data processing unit, a Bluetooth acquisition board and a cloud platform,
the data processing unit is respectively connected with the distributed optical fiber temperature sensor and the distributed optical fiber strain sensor;
the Bluetooth acquisition board is connected with the tilt angle sensor;
and the data processing unit and the Bluetooth acquisition board upload acquired data to the cloud platform.
9. A system for monitoring displacement, strain and temperature within the earth as claimed in claim 8 wherein:
the cloud platform transmits the collected data to the intelligent early warning device, and when the value of the data parameter exceeds a system set value, the intelligent early warning device gives an alarm.
10. A method of using a system for monitoring displacement, strain and temperature within the earth as claimed in any one of claims 1 to 9, comprising:
the geogrid assembly and the sensor assembly are pre-buried in the ground with a certain depth, the geogrid deforms under the action of load in the ground, the distributed optical fiber strain sensor can detect strain variation delta epsilon, when the water level in the soil changes, the distributed optical fiber temperature sensor can detect temperature variation delta T in the ground, a certain inclination angle is generated when the soil slides, and accordingly the geogrid assembly and the sensor assembly are pre-buried in the ground with a certain depthThe inclination angle sensor can measure the variation theta of the rotation angleiThe data processing unit and the Bluetooth acquisition board upload acquired data to the cloud platform for storage and calculation processing;
the Brillouin frequency shift amount of the optical fiber and the strain temperature of the optical fiber are in a linear relation, and the characteristic is utilized to realize the measurement of the internal strain and temperature of the soil body, namely delta vB＝CB,εΔε+CB,TΔ T, in the formula, Δ νBIs the amount of change in the Brillouin frequency shift of the optical fiber, CB,ε、CB,TRespectively, optical fiber strain and temperature coefficient; the angle variation obtained by the inclination angle sensor is the inclination angle of the soil body, and the horizontal displacement delta x of the soil body at the embedding depth of the structure body can be determined through a simple geometric formula, wherein the delta x is l multiplied by sin theta1In the formula, thetaiThe variable quantity of the rotation angle measured by the tilt angle sensor is l, and the l is the length of the tilt angle sensor;
the cloud platform is connected with the intelligent early warning device, and when the calculated data parameter value exceeds a system set value, the intelligent early warning device sends out an alarm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114440752A (en) * | 2022-01-27 | 2022-05-06 | 深圳大学 | Wireless monitoring system and method based on variable-stiffness double-spring graphene displacement sensor |
| CN114563036A (en) * | 2022-01-27 | 2022-05-31 | 深圳大学 | 3D prints graphite alkene sensor application system of geotechnical engineering multi-parameter monitoring |
| CN114739450A (en) * | 2022-03-18 | 2022-07-12 | 哈尔滨工业大学 | Composite intelligent geogrid suitable for cold region roadbed and monitoring and early warning method |
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| CN114563036B (en) * | 2022-01-27 | 2023-12-05 | 深圳大学 | Graphene sensor application system for 3D printing geotechnical engineering multi-parameter monitoring |
| CN114739450A (en) * | 2022-03-18 | 2022-07-12 | 哈尔滨工业大学 | Composite intelligent geogrid suitable for cold region roadbed and monitoring and early warning method |
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