CN104032723A - Method and device for long-term and realtime monitoring of development of soil body - Google Patents
Method and device for long-term and realtime monitoring of development of soil body Download PDFInfo
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- CN104032723A CN104032723A CN201410298105.XA CN201410298105A CN104032723A CN 104032723 A CN104032723 A CN 104032723A CN 201410298105 A CN201410298105 A CN 201410298105A CN 104032723 A CN104032723 A CN 104032723A
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- soil body
- intelligent aggregate
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Abstract
The invention provides a method and a device for long-term and realtime monitoring of development of a soil body. The method includes positioning two sets of piezoelectric intelligent aggregate arrays on a two-concrete-pile steel reinforcement cage, and burying piles in the soil body; applying changing electric signal excitation waves on one piezoelectric intelligent aggregate array, collecting voltage signal waves output by the other piezoelectric intelligent aggregate array, and acquiring development state of the soil body according to the voltage signal waves. By the method and the device, long-term and realtime monitoring of development of the soil body is realized, and acquired development state data of the soil body can provide an analysis basis for pile-soil coupling performance evolution.
Description
Technical field
The invention belongs to civil engineering monitoring and evaluation technical field, relate in particular to a kind of soil body and grow long-term method of real-time and device.
Background technology
In civil engineering monitoring field, need the supporting capacity of assessment stake, and the supporting capacity of stake largely depends on the developmental condition of pile foundation surrounding soil, therefore need to monitor soil body developmental condition.At present, soil body developmental condition generally obtains by detecting soil body sample, cannot Real-time Obtaining soil body developmental condition.The present invention utilizes piezoelectric intelligent aggregate to carry out real-time long term monitoring to soil body developmental condition, at present also without any relevant report.
Summary of the invention
The object of this invention is to provide a kind of soil body based on piezoelectric intelligent aggregate and grow long-term method of real-time and system, the present invention forms respectively actuating station and induction end by two groups of piezoelectric intelligent aggregates, and the behavior pattern between the soil body obtains soil body developmental condition by induction end excitation induced ripple.
For achieving the above object, the invention provides a kind of soil body and grow long-term method of real-time: two groups of piezoelectric intelligent aggregate arrays are positioned respectively, on two concrete pile reinforcing cages, concrete pile to be imbedded to the soil body; One group of piezoelectric intelligent aggregate array is applied to the signal of telecommunication field wave of variation, and gather the voltage signal ripple of another group piezoelectric intelligent aggregate array output, according to voltage signal ripple, obtain soil body developmental condition.
Above-mentioned piezoelectric intelligent aggregate comprises piezoelectric patches and is coated on the concrete cover outside piezoelectric patches.As preferably, piezoelectric patches is coated with waterproofing course.
Above-mentioned according to voltage signal ripple acquisition soil body developmental condition, further comprise sub-step:
(1) set up voltage signal ripple Sample Storehouse:
In the different developmental condition soil bodys, adopt said method to monitor, obtain the voltage signal ripple that the different developmental condition soil bodys are corresponding, and set up voltage signal ripple Sample Storehouse;
(2) voltage signal ripple in the voltage signal ripple of the soil body to be monitored and voltage signal ripple Sample Storehouse is compared, obtain the developmental condition of the soil body to be monitored.
The present invention also provides a kind of soil body to grow long-term real-time monitoring device, comprising:
Carry out concrete pile and induction concrete pile, carry out on concrete pile reinforcing cage and be positioned with the first piezoelectric intelligent aggregate array, on induction concrete pile reinforcing cage, be positioned with the second piezoelectric intelligent aggregate array, the first piezoelectric intelligent aggregate array connects signal generating unit, the second piezoelectric intelligent aggregate array connection data collecting unit; Described signal generating unit is used for the first piezoelectric intelligent aggregate array to apply the signal of telecommunication field wave of variation.
Above-mentioned the first piezoelectric intelligent aggregate array is equidistantly positioned to carry out on concrete pile reinforcing cage along carrying out concrete pile length direction; The second described piezoelectric intelligent aggregate array is equidistantly positioned to respond on concrete pile reinforcing cage along induction concrete pile length direction.
Above-mentioned piezoelectric intelligent aggregate comprises piezoelectric patches and is coated on the concrete cover outside piezoelectric patches.As preferably, piezoelectric patches is coated with waterproofing course.
The present invention provides a kind of soil body to grow long-term real-time monitoring system again, comprising:
The soil body is grown real-time monitoring device, modal processor, higher level's data processing unit and central processing unit, the soil body is grown real-time monitoring device image data and by first communication module, is transmitted and be stored in modal processor, modal processor transfers to higher level's data processing unit by storage data by second communication module, higher level's data processing unit by third communication module by the transfer of data receiving to central processing unit.
Above-mentioned first communication module, second communication module and third communication module are wireless communication module.
The present invention adopts active sensing monitoring mode: both actuating station piezoelectric intelligent aggregate is launched field wave and transmits in the soil body as actuator, and induction end piezoelectric intelligent aggregate is the responses in different places as inductor excitation induced ripple.Soil body developmental condition variation in various degree can correspondingly affect the transmission performance of field wave.Field wave transmits performance and soil body developmental condition has certain corresponding relation.
The propagation of field wave in the soil body is considered as with one dimension compressional wave form, and wave equation is
wherein, the displacement of u representation unit,
e is young's modulus of elasticity, and ρ is density of material.The harmonic response energy of field wave
Thereby acquisition harmonic amplitude
Wherein ω is humorous angular frequency.According to formula
known harmonic amplitude A is relevant with the Young module E of dielectric material (being the soil body).Young's modulus of elasticity is relevant with soil body growth course again, and young's modulus of elasticity is the leading indicator of evaluation soil strength, and along with soil body developmental condition changes, soil strength changes, and young's modulus of elasticity also can change, and harmonic amplitude is corresponding to change.Harmonic amplitude A is also defined as freeze-thaw index, can monitor the variation of soil strength by observing the variation of freeze-thaw index, thereby obtains the change of soil body developmental condition.See Fig. 2～3, the soil body sample temperature that Fig. 2 is test is curve over time, Fig. 3 is the relation curve of soil body sample temperature and freeze thawing index, Fig. 3 has reflected that native stress wave in body develops, crest shows soil strength maximum value, trough represents soil strength minimum value, and wave form varies has shown soil body growth course.
Compared to the prior art, the present invention has the following advantages and beneficial effect:
Adopt piezoelectric intelligent aggregate to realize the soil body and grow Real-Time Monitoring, the soil body developmental condition data of acquisition can be the native coupling performance differentiation of stake analysis foundation are provided.
Accompanying drawing explanation
Fig. 1 is that the soil body of the present invention is grown real-time monitoring device schematic diagram;
Fig. 2 is soil body sample temperature curve over time;
Fig. 3 is the relation curve of soil body sample temperature and freeze thawing index;
Fig. 4 is the network topology structure schematic diagram that the soil body of the present invention is grown real-time monitoring system.
The specific embodiment
The present invention is based on piezoelectric intelligent aggregate realizes, the core of piezoelectric intelligent aggregate is piezoelectric patches, piezoelectric patches has piezoelectric property, meeting output voltage signal while there is strain, when changing, applied field can export generation strain signal, because this characteristic makes piezoelectric patches, can be used as inductor, can be used as again actuator.Piezoelectric intelligent aggregate consists of the concrete cover outside piezoelectric patches and piezoelectric patches, and as preferably, piezoelectric patches is through waterproofing work, and piezoelectric patches is coated with epoxy resin waterproofing course.
The present invention utilizes the piezoelectric property of piezoelectric intelligent aggregate, see Fig. 1, two groups of piezoelectric intelligent aggregate arrays are positioned respectively on two concrete pile reinforcing cages, to burying after concrete pile concrete perfusion in people's soil body, separated by a distance between two concrete piles, this distance is wanted to guarantee that two soil bodys between concrete pile can represent the development condition in the soil body to be monitored region, can guarantee again the normal transmission of fluctuation signal.
One group in two groups of piezoelectric intelligent aggregate arrays as actuating station, is positioned to carry out in concrete pile; Another group, as induction end, is positioned to respond in concrete pile; Actuating station is used for transmitting, and induction end is used for receiving the signal that actuating station sends.Piezoelectric intelligent aggregate array is for being positioned a series of piezoelectric intelligent aggregates of concrete pile reinforcing cage by predetermined interval along concrete pile length direction.The piezoelectric intelligent aggregate array of actuating station is drawn with signal generating unit and is connected by wire, and the piezoelectric intelligent aggregate array of induction end is drawn with data acquisition unit and is connected by wire.In this concrete enforcement, signal generating unit adopts the PXI of NI company signal generator, and data acquisition unit adopts the American National Instrument Instrument USB-6009 of company data collecting card.
Signal generating unit sends the signal of telecommunication field wave changing to actuating station, the piezoelectric intelligent aggregate generation deformation of actuating station, thereby produce stress field wave, and be transferred to induction stake by the soil body, the induction end piezoelectric intelligent aggregate that receives stress field wave produces voltage signal, by data acquisition unit, is gathered.During stress field wave transmits in the soil body, if soil body developmental condition is stable, stress field wave rule changes, and the voltage signal of data acquisition unit collection presents stability characteristic (quality) in certain period; If the soil body is because the factors vary genesis and development such as weather develops, the corresponding acute variation that presents of stress field wave, also can there is acute variation in the voltage signal of data acquisition unit collection, and the acute variation of voltage signal can reflect the evolution process of the soil body in the corresponding period.
Adopt and carry out stake and respond to stake combination and can monitor the zones of different of the soil body, in this concrete enforcement, adopt optimizing data network topology structure to realize the real-time transmission of high-frequency data.See Fig. 4, in optimizing data network topology, one group of soil body developmental condition data of carrying out stake and induction stake combination monitoring being stored in the modal processor that is placed in terminal, modal processor by wireless communication module by the data upload of storage the data processing unit to higher level.Higher level's data processing unit by the data upload receiving to central processing unit.
Below in conjunction with the specific embodiment, further illustrate the course of work of the present invention and principle:
1, piezoelectric patches skin is wrapped up to epoxy resin layer, concrete cover successively, epoxy resin layer is used for waterproof, thereby obtains piezoelectric intelligent aggregate, and the piezoelectric patches adopting in this specific embodiment is PZT piezoelectric patches.
2, one group of piezoelectric intelligent aggregate is equidistantly buried to people and carry out concrete pile, and be positioned to carry out concrete pile reinforcing cage; Another group piezoelectric intelligent aggregate equidistantly buries people and responds to concrete pile, is positioned to respond to concrete pile reinforcing cage; By the holding wire being connected with piezoelectric intelligent aggregate from concrete pile Base top contact.
3, execution concrete pile and induction concrete pile are imbedded in the soil body to be monitored, carried out concrete pile and be used for firing stress field wave, induction concrete pile is used for receiving the stress field wave of carrying out concrete pile transmitting.The characteristic of stress field wave is produced by signal generating unit, can the variation that different signal of telecommunication field waves transmits through the soil body to analyze stress field wave occur setting signal generating unit.
Carry out the stress field wave of concrete pile generation after soil body transmission, due to the difference of the soil body at each phasic development state, in transmitting procedure, stress field wave will inevitably produce different variation characteristics, stress field wave after soil body transmission can cause that induction concrete pile produces voltage signal ripple, and received by data acquisition unit, in transmitting procedure, the variation of stress field wave will inevitably cause the variation of the voltage signal ripple that concrete pile produces.
The Common Parameters that characterizes soil body developmental condition comprises porosity, moisture content, freeze thawing index modulus of shearing etc.In the different developmental condition soil bodys, adopt apparatus of the present invention to monitor, obtain the voltage signal ripple corresponding to the soil body of different developmental conditions, and set up voltage signal ripple Sample Storehouse.Voltage signal ripple in the voltage signal ripple of each data acquisition unit collection and voltage signal ripple Sample Storehouse is compared, obtain soil body developmental condition.
5, the soil body developmental condition data that data acquisition unit is carried out stake and induction stake combination monitoring by wireless transport module by each group send and are stored to modal processor, and modal processor will be stored data upload to higher level's data processing unit by wireless transport module.Higher level's data processing unit will receive data upload to long-range central processing unit.By central processing unit, can obtain the developmental condition in each region to be monitored of the soil body, these developmental condition data and corresponding wave spectrum can provide analysis foundation for the differentiation of the native coupling performance of stake.
Claims (10)
1. the soil body is grown long-term method of real-time, it is characterized in that:
Two groups of piezoelectric intelligent aggregate arrays are positioned respectively, on two concrete pile reinforcing cages, concrete pile to be imbedded to the soil body; One group of piezoelectric intelligent aggregate array is applied to the signal of telecommunication field wave of variation, and gather the voltage signal ripple of another group piezoelectric intelligent aggregate array output, according to voltage signal ripple, obtain soil body developmental condition.
2. the soil body as claimed in claim 1 is grown long-term method of real-time, it is characterized in that:
Described piezoelectric intelligent aggregate comprises piezoelectric patches and is coated on the concrete cover outside piezoelectric patches.
3. the soil body as claimed in claim 2 is grown long-term method of real-time, it is characterized in that:
Described piezoelectric patches is coated with waterproofing course.
4. the soil body as claimed in claim 1 is grown long-term method of real-time, it is characterized in that:
Described obtains soil body developmental condition according to voltage signal ripple, further comprises sub-step:
(1) set up voltage signal ripple Sample Storehouse:
In the different developmental condition soil bodys, adopt method described in claim 1 to obtain the voltage signal ripple that the different developmental condition soil bodys are corresponding, and set up voltage signal ripple Sample Storehouse;
(2) voltage signal ripple in voltage signal ripple corresponding to the soil body to be monitored and voltage signal ripple Sample Storehouse is compared, obtain the developmental condition of the soil body to be monitored.
5. the soil body is grown long-term real-time monitoring device, it is characterized in that, comprising:
Carry out concrete pile and induction concrete pile, carry out on concrete pile reinforcing cage and be positioned with the first piezoelectric intelligent aggregate array, on induction concrete pile reinforcing cage, be positioned with the second piezoelectric intelligent aggregate array, the first piezoelectric intelligent aggregate array connects signal generating unit, the second piezoelectric intelligent aggregate array connection data collecting unit; Described signal generating unit is used for the first piezoelectric intelligent aggregate array to apply the signal of telecommunication field wave of variation.
6. the soil body as claimed in claim 6 is grown long-term real-time monitoring device, it is characterized in that:
The first described piezoelectric intelligent aggregate array is equidistantly positioned to carry out on filling pile cage of reinforcement along carrying out concrete pile length direction; The second described piezoelectric intelligent aggregate array is equidistantly positioned to respond on filling pile cage of reinforcement along induction concrete pile length direction.
7. the soil body as claimed in claim 6 is grown long-term real-time monitoring device, it is characterized in that:
Described piezoelectric intelligent aggregate comprises piezoelectric patches and is coated on the concrete cover outside piezoelectric patches.
8. the soil body as claimed in claim 7 is grown long-term real-time monitoring device, it is characterized in that:
Described piezoelectric patches is coated with waterproofing course.
9. the soil body is grown long-term real-time monitoring system, it is characterized in that, comprising:
The soil body is grown real-time monitoring device, modal processor, higher level's data processing unit and central processing unit, the soil body is grown real-time monitoring device image data and by first communication module, is transmitted and be stored in modal processor, modal processor transfers to higher level's data processing unit by storage data by second communication module, higher level's data processing unit by third communication module by the transfer of data receiving to central processing unit;
The described soil body is grown real-time monitoring device and is comprised execution concrete pile and induction concrete pile, carry out on concrete pile reinforcing cage and be positioned with the first piezoelectric intelligent aggregate array, on induction concrete pile reinforcing cage, be positioned with the second piezoelectric intelligent aggregate array, the first piezoelectric intelligent aggregate array connects signal generating unit, the second piezoelectric intelligent aggregate array connection data collecting unit; Described signal generating unit is used for the first piezoelectric intelligent aggregate array to apply the signal of telecommunication field wave of variation.
10. the soil body as claimed in claim 9 is grown long-term real-time monitoring system, it is characterized in that:
Described first communication module, described second communication module and described third communication module are wireless communication module.
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| CN201410298105.XA CN104032723B (en) | 2014-06-26 | 2014-06-26 | The soil body grows long-term method of real-time and device |
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| CN201410298105.XA CN104032723B (en) | 2014-06-26 | 2014-06-26 | The soil body grows long-term method of real-time and device |
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Cited By (3)
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|---|---|---|---|---|
| CN106353203A (en) * | 2016-10-13 | 2017-01-25 | 武汉大学 | Visual self-sensing detector for real-time monitoring of soil mass performance |
| CN111579355A (en) * | 2020-06-18 | 2020-08-25 | 湖北震泰建设工程质量检测有限责任公司 | Concrete cast-in-place pile static load test unbalance loading monitoring method based on piezoelectric impedance frequency shift |
| CN111595374A (en) * | 2020-05-06 | 2020-08-28 | 三峡大学 | Telegraph pole buried depth and damage detection method based on Rayleigh waves |
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| CN101059408A (en) * | 2007-05-15 | 2007-10-24 | 吉林省交通科学研究所 | Bridge super long large diameter pile foundation bearing capacity test method |
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| US5050355A (en) * | 1990-04-03 | 1991-09-24 | Mikhail Pildysh | Ground anchor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106353203A (en) * | 2016-10-13 | 2017-01-25 | 武汉大学 | Visual self-sensing detector for real-time monitoring of soil mass performance |
| CN106353203B (en) * | 2016-10-13 | 2019-05-10 | 武汉大学 | A kind of visualization of soil capability real-time monitoring is from perceiving detector |
| CN111595374A (en) * | 2020-05-06 | 2020-08-28 | 三峡大学 | Telegraph pole buried depth and damage detection method based on Rayleigh waves |
| CN111595374B (en) * | 2020-05-06 | 2021-10-19 | 三峡大学 | Telegraph pole buried depth and damage detection method based on Rayleigh waves |
| CN111579355A (en) * | 2020-06-18 | 2020-08-25 | 湖北震泰建设工程质量检测有限责任公司 | Concrete cast-in-place pile static load test unbalance loading monitoring method based on piezoelectric impedance frequency shift |
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