CN111879823A - Polymer-based piezoelectric composite geotextile band for monitoring internal damage of geotechnical engineering and preparation method thereof - Google Patents
Polymer-based piezoelectric composite geotextile band for monitoring internal damage of geotechnical engineering and preparation method thereof Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
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- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
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Abstract
The invention discloses a polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering, which comprises a piezoelectric composite geotechnical belt body, wherein the piezoelectric composite geotechnical belt body is formed by mixing a polymer matrix, conductive carbon black, piezoelectric ceramic particles and a titanate coupling agent, a plurality of silver-detected sections are uniformly distributed on the piezoelectric composite geotechnical belt, the interval between every two adjacent silver-detected sections is 1CM, silver electrodes are arranged on the upper surface and the lower surface of each silver-detected section, an anode lead is connected to the upper surface of each silver-detected section, and a cathode lead is connected to the lower surface of each silver-detected section. The piezoelectric composite geotechnical belt has the advantages of wide application range, high self-sensing sensitivity and good linearity, and realizes distributed monitoring and early warning of internal damage in the whole life cycle of geotechnical engineering.
Description
Technical Field
The invention relates to a polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering, and further relates to a preparation method of the polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering.
Background
In recent years, with the large-scale construction of the traffic infrastructure in China, due to the reasons of inadequate investigation and design, incomplete construction, long-term natural disasters and the like, the damages such as retaining wall collapse, tunnel collapse, roadbed destruction, landslide and the like exist in geotechnical engineering, and the serious loss is brought to the lives and properties of people. Train derailment caused by mountain landslide is more frequent due to road surface collapse caused by roadbed destruction. Therefore, scholars at home and abroad make a great deal of research on geotechnical engineering monitoring and safety early warning.
In the current monitoring means, the traditional discontinuous manual detection can be detected only after the surface of a detected object is damaged, and the occurrence of major engineering casualty accidents cannot be avoided in time. Therefore, the research and development of a distributed monitoring and early warning technology for the internal damage in the geotechnical engineering full life cycle is of great significance.
Disclosure of Invention
In view of the defects of the background art, the technical problem to be solved by the invention is to provide a polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering. The piezoelectric composite geotechnical belt has the advantages of wide application range, high self-sensing sensitivity and good linearity, and realizes distributed monitoring and early warning of internal damage in the whole life cycle of geotechnical engineering.
Therefore, the polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering, provided by the invention, comprises a piezoelectric composite geotechnical belt body, wherein the piezoelectric composite geotechnical belt body is formed by mixing a polymer matrix, conductive carbon black, piezoelectric ceramic particles and a titanate coupling agent, a plurality of silver-measured sections are uniformly distributed on the piezoelectric composite geotechnical belt, the interval between every two adjacent silver-measured sections is 1CM, silver electrodes are arranged on the upper surface and the lower surface of each silver-measured section, an anode lead is connected to the upper surface of each silver-measured section, and a cathode lead is connected to the lower surface of each silver-measured section.
The invention has the advantages that,
(1) the piezoelectric composite geotechnical belt can be applied to monitoring of damage inside a roadbed, monitoring of damage inside a side slope, monitoring of damage inside a retaining wall, monitoring of damage inside a tunnel mountain body and the like, and is wide in application range.
(2) The piezoelectric composite geotechnical belt can be independently embedded or attached to engineering structures such as reinforcing steel bars and geogrids, is convenient and quick to lay, and cannot damage geotechnical engineering.
(3) When geotechnical engineering is damaged internally, the change of stress strain causes the geotechnical belt to be stretched and bent, and charges are generated under the piezoelectric effect. The position and the size of the deformation can be accurately judged according to the charge information, and the self-sensing sensitivity is high and the linearity is good.
(4) The polymer-based piezoelectric composite geotechnical belt solves the problems of small measuring range, short service life, non-distributed monitoring and the like of the traditional monitoring technology. The dependent variable range can reach more than 10 percent, and distributed monitoring and early warning of internal damage in the whole life cycle of geotechnical engineering is realized.
(5) The piezoelectric composite geotextile band monitors internal damage information, wireless transmission is carried out through the access device, the information is transmitted into a traffic control management center, wiring is reduced, and maintenance cost is low.
Drawings
Fig. 1 is a schematic partial structure view of a piezoelectric composite geotextile strip according to a first embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a process for preparing the piezoelectric composite geotextile strip provided in fig. 1;
fig. 3 is a schematic structural view of the outer end face of a piezoelectric composite geotextile band provided in fig. 1;
fig. 4 is a schematic structural view of an outer end surface of a piezoelectric composite geotextile strip according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of the interior of a connector of the piezoelectric composite geotextile band provided in fig. 4;
fig. 6 is a schematic structural diagram illustrating a cross-section of a connector of the piezo-electric composite geo-belt shown in fig. 5;
fig. 7 is a schematic structural diagram of the piezoelectric composite geotextile band provided by fig. 6 at a joint a;
fig. 8 is a schematic structural diagram of an application of a piezoelectric composite geotextile strip in a roadbed, provided by the invention;
fig. 9 is a schematic structural diagram of an application of the piezoelectric composite geotextile strip in a roadbed.
Detailed Description
Referring to fig. 1, 2 and 3, the polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering comprises a piezoelectric composite geotechnical belt body 1, wherein the piezoelectric composite geotechnical belt body 1 is formed by mixing a polymer matrix, conductive carbon black, piezoelectric ceramic particles and a titanate coupling agent, the mass fraction of the polymer matrix is 50-60%, the mass fraction of the conductive carbon black is 5-15%, the mass fraction of the piezoelectric ceramic particles is 30-40%, and the mass fraction of the titanate coupling agent is 2-5%. The polymer matrix is a high-density polyethylene matrix, and the piezoelectric ceramic particles are PZT-5 piezoelectric ceramic particles.
The piezoelectric composite geotechnical belt comprises a piezoelectric composite geotechnical belt body 1, wherein a plurality of sections 2 to be measured by silver are uniformly distributed on the piezoelectric composite geotechnical belt body 1, the sections 2 to be measured by silver are 10CM, the interval between adjacent sections 2 to be measured by silver is 1CM, the upper surface and the lower surface of the sections 2 to be measured by silver are connected with an anode lead 3 by silver electrodes, and the lower surface of the sections to be measured by silver is connected with a cathode lead 4. The outer surface of the piezoelectric composite geotechnical belt body 1 is packaged by PVC rubber materials. The horizontal both sides of piezoelectricity composite geotechnique's area body 1 surface have at least one strengthening rib 11, strengthening rib 11 is three pyramids taper, piezoelectricity composite geotechnique's area equipartition has anti-skidding decorative pattern 12. When the geotechnical belt is laid, the anti-slip patterns and the reinforcing ribs increase the friction force with geotechnical engineering, and the anti-slip patterns and the reinforcing ribs are not easy to slip.
Referring to fig. 2, a method for preparing a polymer-based piezoelectric composite geotextile band for monitoring internal damage of geotechnical engineering comprises the following steps,
(1) and (3) finely grinding the polymer matrix, the conductive carbon black and the piezoelectric ceramic particles by a planetary ball mill and uniformly mixing. The polymer matrix accounts for 50-60% by mass, and is a high-density polyethylene matrix; the mass fraction of the conductive carbon black is 5-15%; the mass fraction of the piezoelectric ceramic particles is 30-40%, and the piezoelectric ceramic particles adopt PZT-5 piezoelectric ceramic particles.
(2) And (2) adding a titanate coupling agent into the mixture obtained in the step (1), and uniformly mixing, wherein the mass fraction of the titanate coupling agent is 2% -5%.
(3) Feeding by an automatic suction machine, melting and mixing the mixture obtained in the step (2) by a double-screw extruder, fully melting the polymer matrix, the conductive carbon black and the piezoelectric ceramic particles by the double-screw extruder, and uniformly dispersing the conductive carbon black and the piezoelectric ceramic particles into the polymer by stirring and extruding.
(4) And then, injection molding is carried out through an injection molding machine, the polymer-based piezoelectric composite geotextile after injection molding is subjected to blast and water immersion cooling, and then the geotextile is slowly moved out under the traction of a traction device to prepare the piezoelectric composite geotextile body with the thickness of 1.5mm, and cutting is carried out according to the length and the width of the actual engineering.
(5) Arranging a plurality of measuring sections on the piezoelectric composite geotechnical belt 1, wherein the length of each measuring section is 10CM, the interval between every two adjacent measuring sections is 1CM, and the upper surface and the lower surface of each measuring section are both covered by silver electrodes, namely the measuring section is a covered section 2;
(6) and carrying out polarization process treatment on the piezoelectric composite geotechnical belt, wherein the polarization temperature is 80-100 ℃, the polarization voltage is 3kV/mm-6kV/mm, and the polarization time is 10min-30 min. The upper surface of the section to be silver-tested is connected with a positive lead 3, and the lower surface of the section to be silver-tested is connected with a negative lead 4;
(7) and finally, packaging the outer surface of the polymer-based piezoelectric composite earthwork belt by adopting a PVC rubber material.
Referring to fig. 1, 2, 4, 5, 6 and 7, in a second embodiment of the present invention, a piezo-electric composite geo-belt includes a plurality of longitudinal grooves 13 uniformly distributed in a longitudinal direction on both sides of an outer surface of a body 1 of the piezo-electric composite geo-belt. The inner wall of the longitudinal groove 13 on the outer surface of the piezoelectric composite geotechnical belt body is a smooth surface, and anti-skid patterns 12 are uniformly distributed on other parts outside the inner wall of the longitudinal groove 13 of the piezoelectric composite geotechnical belt. The connector 14 is connected to the piezoelectric composite geotextile strip body, when the piezoelectric composite geotextile strip is laid, the end of the geotextile strip is connected with the next geotextile strip through the connector 14, and the use is very convenient.
The connector 14 comprises a shell 15 and a connecting cover 16, the lower end of the shell 15 is provided with an opening, one end of the connecting cover 16 is hinged to one side of the opening of the shell, and the other end of the connecting cover 16 is buckled on the outer end face of the other side of the opening of the shell 15. The outer end face of the other side of the opening of the shell 15 is provided with a fastener 17, the fastener 17 is provided with a slot 18 towards the inner side, and a hook 19 is arranged in the slot 18. The connecting cover 16 is provided with a clamping piece 20 matched with the fastener 17, and the bottom of the clamping piece 20 is provided with a clamping groove 21. The inner cavity of the shell 15 is provided with four strip-shaped convex blocks 22, the strip-shaped convex blocks 22 are arranged in pairs in an opposite mode, namely two pairs of strip-shaped convex blocks 22 are arranged in the inner cavity of the shell 15, and the strip-shaped convex blocks 22 are matched with the longitudinal grooves 13 on the outer surface of the piezoelectric composite earthwork belt body. When connecting adjacent geobelts, the opening of the casing 15 is inserted into the geobelt, and the strip-shaped projection 22 is inserted into the longitudinal groove 13. Two pairs of strip-shaped lugs 22 in the shell are respectively inserted into the longitudinal grooves 13 at the end parts of two adjacent geobelt, each pair of strip-shaped lugs are respectively inserted into the clamping grooves at two sides of the geobelt, and when the shell 15 and the connecting cover 16 are in a buckling state, the hook piece 19 is clamped into the clamping groove 21.
Referring to fig. 8, the application method of the first embodiment of the polymer-based piezoelectric composite geotextile band for monitoring internal damage of geotechnical engineering, which is disclosed by the invention, is applied to a roadbed. Firstly, the polymer-based piezoelectric composite earthwork belt is originally buried in the roadbed 5 or attached to the geogrid of the reinforced soil, so that the laying is convenient and quick, and the geotechnical engineering can not be damaged. And then connecting the positive lead 3 and the negative lead 4 on the section 2 to be measured with an access device 6 on one side of the roadbed, wherein the access device comprises a signal processing system and a wireless signal transmission system.
When the slip surface occurs, the piezoelectric composite geotextile belt body 1 positioned at the right center and nearby of the slip surface is stretched, bent and the like due to the change of the stress strain. The piezoelectric composite geotechnical belt body 1 generates different degrees of strain according to different stresses, the strain geotechnical belt positioned in the center of the slip crack surface 8 generates large strain, and the strain geotechnical belt positioned near the slip crack surface 8 generates large strain. The polymer-based piezoelectric composite geotextile belt 1 generates charges due to the piezoelectric effect at the strain part, information is transmitted to the access device 6 through the positive electrode lead 3 and the negative electrode lead 4, and after the information is processed by the signal processing system, the position and the size of the charges are transmitted to the traffic control management center through the wireless signal transmission system. The position and the size of the deformation can be accurately judged by monitoring the size and the position of the charge generated by the piezoelectric effect of the polymer-based piezoelectric composite geotextile strip 1, and the self-sensing sensitivity is high and the linearity is good.
The tension sensitive effect of the polymer-based piezoelectric composite geotextile strip is utilized, the magnitude of impedance changing along with strain is measured according to the transmission information of the positive lead 3 and the negative lead 4, the deformation information is confirmed again according to the variation of the impedance, and the internal damage deformation degree is measured according to the variation of the impedance. Then the deformation information is transmitted to a traffic control management center through a wireless signal transmission system by the access device, and workers can timely process the deformation information, so that major engineering casualty accidents such as roadbed damage and pavement collapse are avoided.
Referring to fig. 9, the application method of the second embodiment of the polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering in the invention is applied to the side slope along the railway:
and arranging the polymer-based piezoelectric composite geotextile band body 1 on each slope of the train 7 passing through the continuous slopes. The piezoelectric composite geotechnical belt 1 can be independently embedded and also can be attached to engineering structures such as reinforcing steel bars, geogrids and the like. When a mountain landslide occurs, the landslide surface 9 enables the polymer-based piezoelectric composite geotextile band 1 to be strained or even broken, the magnitude and the position of electric charges generated by the piezoelectric effect are utilized, and the electrical impedance deformation is monitored by utilizing the tension sensitive effect of the polymer-based piezoelectric composite geotextile band 1. And according to the generated charge information and the tested piezoelectric impedance information, the wireless signal transmission system is transmitted to the communication information management center through the access device 6. The traffic information management center confirms landslide through the satellite monitoring station 10 and transmits landslide information to the train. The train is braked in time, so that major engineering casualty accidents such as train derailment are avoided.
The piezoelectric composite geotechnical belt body 1 can also be applied to other geotechnical engineering, the piezoelectric composite geotechnical belt body can be used for monitoring internal damage of a side slope, a retaining wall, a tunnel mountain and the like.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering is characterized in that: the piezoelectric composite geotextile band comprises a piezoelectric composite geotextile band body, wherein the piezoelectric composite geotextile band body is formed by mixing a polymer matrix, conductive carbon black, piezoelectric ceramic particles and a titanate coupling agent, a plurality of sections to be measured by silver are uniformly distributed on the piezoelectric composite geotextile band, the upper surface and the lower surface of the section to be measured by silver electrodes are connected with an anode lead by the upper surface of the section to be measured by silver, and the lower surface of the section to be measured by silver is connected with a cathode lead.
2. The polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering according to claim 1, wherein: the mass fraction of the polymer matrix is 50-60%, the mass fraction of the conductive carbon black is 5-15%, and the mass fraction of the piezoelectric ceramic particles is 30-40%.
3. The polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering according to claim 2, wherein: the mass fraction of the titanate coupling agent is 2-5%.
4. The polymer-based piezoelectric composite geotechnical band for internal damage monitoring in geotechnical engineering according to claim 1, 2 or 3, wherein: the polymer matrix is a high-density polyethylene matrix, and the piezoelectric ceramic particles are PZT-5 piezoelectric ceramic particles.
5. The polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering according to claim 4, wherein: the section to be tested silver is 10CM, and the interval between adjacent sections to be tested silver is 1 CM.
6. The polymer-based piezoelectric composite geotechnical band for internal damage monitoring in geotechnical engineering according to claim 1, 2, 3 or 5, wherein: the outer surface of the piezoelectric composite geotechnical belt body is packaged by PVC rubber materials.
7. The polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering according to claim 6, wherein: the horizontal both sides of piezoelectricity composite geotechnique's area body surface have an at least strengthening rib, piezoelectricity composite geotechnique's area equipartition has anti-skidding decorative pattern.
8. The polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering according to claim 6, wherein: the horizontal both sides of piezoelectricity composite geotechnique's area body surface have an at least strengthening rib, the vertical evenly distributed a plurality of vertical grooves in piezoelectricity composite geotechnique's area body surface both sides, the vertical inslot wall in piezoelectricity composite geotechnique's area body surface is the smooth surface, other part equipartitions outside the vertical inslot wall in piezoelectricity composite geotechnique's area have anti-skidding decorative pattern.
9. The polymer-based piezoelectric composite geotechnical belt for monitoring internal damage of geotechnical engineering according to claim 8, wherein: the connector is connected to the piezoelectric composite geotechnical belt body and comprises a shell and a connecting cover, an opening is formed in the lower end of the shell, one end of the connecting cover is hinged to one side of the opening of the shell, and the other end of the connecting cover is buckled on the outer end face of the other side of the opening of the shell.
10. A method for preparing the polymer-based piezoelectric composite geotextile band for monitoring geotechnical engineering internal damage according to claim 1, wherein the method comprises the following steps: the steps are as follows,
(1) finely grinding and uniformly mixing the polymer matrix, the conductive carbon black and the piezoelectric ceramic particles by a planetary ball mill;
(2) adding a titanate coupling agent into the mixture obtained in the step (1), and uniformly mixing;
(3) melting and mixing the mixture obtained in the step (2) by a double-screw extruder, fully melting the polymer matrix, the conductive carbon black and the piezoelectric ceramic particles by the double-screw extruder, and uniformly dispersing the conductive carbon black and the piezoelectric ceramic particles into the polymer by stirring and extruding;
(4) then, injection molding is carried out through an injection molding machine, blowing and water immersion cooling are carried out, then the piezoelectric composite geotextile strip is slowly moved out under the traction of a traction device, the thickness of the manufactured piezoelectric composite geotextile strip body is 1.5mm, and cutting is carried out according to the length and the width of the actual engineering;
(5) arranging a plurality of measuring sections on the piezoelectric composite geotechnical belt, wherein the length of each measuring section is 10CM, the interval between every two adjacent measuring sections is 1CM, the upper surface and the lower surface of each measuring section are both coated with silver electrodes, and each measuring section is a silver-coated measuring section;
(6) carrying out polarization process treatment on the piezoelectric composite geotextile band, wherein the upper surface of the section to be silver-measured is connected with a positive lead, and the lower surface of the section to be silver-measured is connected with a negative lead;
(7) and finally, packaging the outer surface of the polymer-based piezoelectric composite earthwork belt by adopting a PVC rubber material.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418442A (en) * | 2021-06-18 | 2021-09-21 | 深圳格通无线科技有限公司 | Ground engineering deformation monitoring method |
| CN115198815A (en) * | 2022-07-27 | 2022-10-18 | 东南大学 | Side slope internal deformation distributed monitoring system based on piezoelectric self-sensing geotechnical cable and construction method |
| CN116066522A (en) * | 2023-01-16 | 2023-05-05 | 武汉大学 | Bionic self-inductance Transmission belt |
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2020
- 2020-07-03 CN CN202010630169.0A patent/CN111879823A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418442A (en) * | 2021-06-18 | 2021-09-21 | 深圳格通无线科技有限公司 | Ground engineering deformation monitoring method |
| CN115198815A (en) * | 2022-07-27 | 2022-10-18 | 东南大学 | Side slope internal deformation distributed monitoring system based on piezoelectric self-sensing geotechnical cable and construction method |
| CN115198815B (en) * | 2022-07-27 | 2023-08-25 | 东南大学 | Side slope internal deformation distributed monitoring system based on piezoelectric self-sensing geotechnical cable and construction method |
| CN116066522A (en) * | 2023-01-16 | 2023-05-05 | 武汉大学 | Bionic self-inductance Transmission belt |
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