CN102678178B - Safety early-warning analyzer for freezing construction for connecting aisle of tunnel and working method of safety early-warning analyzer - Google Patents
Safety early-warning analyzer for freezing construction for connecting aisle of tunnel and working method of safety early-warning analyzer Download PDFInfo
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- CN102678178B CN102678178B CN 201210128009 CN201210128009A CN102678178B CN 102678178 B CN102678178 B CN 102678178B CN 201210128009 CN201210128009 CN 201210128009 CN 201210128009 A CN201210128009 A CN 201210128009A CN 102678178 B CN102678178 B CN 102678178B
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Abstract
The invention belongs to the technical field of freezing construction for connecting aisles of tunnels, and provides a safety early-warning analyzer based on a fiber brag grating for freezing construction for a connecting aisle of a tunnel and a working method of the safety early-warning analyzer. The safety early-warning analyzer comprises a front-end fiber brag grating sensor, a data acquiring device, a data analyzing device, a monitoring early-warning device and a displaying device, an output end of the front-end fiber brag grating sensor is connected with the data acquiring device, the data acquiring device is connected with the data analyzing device, an output end of the data analyzing device is connected with the monitoring early-warning device, and the monitoring early-warning device is connected with the displaying device. The safety early-warning analyzer and the working method have the advantages that the temperature of frozen soil, strain and deformation of the existing tunnel in a freezing process can be continuously monitored in real time, and a safety state of the tunnel is assessed in real time.
Description
Technical field
The invention belongs to tunnel connection channel frozen construction technical field, be specifically related to a kind of tunnel connection channel frozen construction security early-warning analysis instrument and method of work thereof based on fiber grating.
Background technology
Service channel is the important guarantee of tunnel operation, present stage the service channel frozen construction since its good ameliorative to the soil body under the disadvantageous geologic condition of high hydraulic pressure, soft stratum in the urban municipal construction such as subway, obtain using more and more widely.Artificial frozen construction technology possesses skills reliably, technical maturity, the controlled characteristics of construction:
1) water shutoff is good.There is Free water just can freeze into frozen soil, forms the frozen soil wall.No matter be pervious layer, or water barrier.The frozen soil wall can intercept underground water and invade, and forms dry construction environment;
2) intensity is high.It is generally acknowledged that frozen soil is a kind of viscoelastoplastic material, its intensity with soil property, unit weight, moisture content, salt content, whether exist the factors such as ice lens and temperature relevant. frozen soil strength generally can reach 2-lOMPa, much larger than melting native intensity.Thereby play the effect of support structure wall;
3) strong adaptability.Adapt to various soil layers and multiple underground construction.Especially be applicable to that water content is large, the stratum is weak, the underground construction that other engineering method constructional difficulties maybe can't be constructed;
4) restoration.Soil layer restored to the original state after construction finished.Little to the soil layer destructiveness, this is that other engineering method is incomparable;
5) nuisanceless.Exchange cold energy for electric energy, not pollutant atmosphere.The unharmful substance discharging, pollution-free to underground water.In the high engineering of environmental requirement, superiority is especially obvious;
6) controllability.Freezing duration, frost wall thickness, frost wall shape etc. artificially all can regulate and control;
7) can under intensive building area and existing engineering works, construct, need not carry out drainage of foundation pit, can avoid causing that because drawing water foundation settlement causes the adverse effect to Adjacent Buildings;
8) draw anchor without a lining, nothing, can carry out the open type construction and enlarge building area, reduction of erection time.
Though oneself is ripe for artificial freezing technology industry, frozen soil artificial technology's theoretical research still has many important problems, thaws such as Temperature Field of Permafrost, frost-heave force, thaw collapse, pressure etc.After we know that artificial Freezing stratum as rapid begins, low temperature cold mediator (salt solution) in the freezing pipe flows and with stratum on every side interchange of heat to occur constantly, so that form together low-temperature frozen soil cylinder in each freezing pipe week, continuous supply along with the freezing pipe cold, the frozen soil cylinder is constantly expanded, and adjacent frozen soil cylinder handing-over also forms the water proof carrying Frozen Soil Cylinder (wall) with certain thickness and intensity.The quality of refrigerating effect is directly connected to the safety of service channel excavation, the size of frozen swell and melt settlement is directly connected to the safety of existing tunnel structure and surrounding enviroment, so the deformation monitoring of the monitoring of the molding effect of Frozen Body and tunnel existing structure has vital directive function to practice of construction.
Traditional tunnel connection channel frozen construction security state evaluation is mainly carried out frozen soils temperature and the monitoring of frozen soil pressure two aspects and artificial inspection by frozen soil and is assessed.The frozen soil thermometric uses temperature measurer, and its refrigeration system and cooling water circulation and freezing curtain side wall temperature are used temperature measurer and measured in conjunction with accurate mercurial thermometer.This method is so that need many waterproof signal-transmitting cables in a cryovial, and each electronic sensor needs good waterproof and dampproof protection; The monitoring of frozen soil pressure is mainly monitored by the earth pressure cell of burying underground in the soil layer, and earth pressure cell only is embedded in the soil layer of section of jurisdiction in this method, and the soil pressure of monitoring out can't represent other pressure everywhere of soil layer.Simply calculate the development range of Frozen Soil Cylinder on the data basis of monitoring gained, add on-the-spot inspection, according to construction experience tunnel connection channel frozen construction safe condition is assessed.
In sum, in view of traditional tunnel connection channel frozen construction in the defective that exists aspect the safe early warning, tunnel connection channel frozen construction process is carried out Real-Time Monitoring and safe early warning has important engineering significance and application value.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of tunnel connection channel frozen construction security early-warning analysis instrument and method of work thereof are provided, and this analyzer can be monitored and its safe condition of real-time assessment by real-time continuous the frozen soils temperature in the freezing process, strain and existing tunnel are out of shape.
A kind of tunnel connection channel frozen construction security early-warning analysis instrument of the present invention comprises fiber-optic grating sensor, data acquisition unit, data analysis set-up, monitoring warning device and display unit.
Fiber-optic grating sensor is used for the variation of perception service channel frozen soils construction temperature and strain; Fiber-optic grating sensor comprises sensor, optical fiber cable and flange, during use fiber-optic grating sensor is implanted to be frozen the soil body or to be fixed on the tunnel duct piece, with flange sensor is connected with optical fiber cable, and is connected serially to data acquisition unit;
Data acquisition unit is used for the optical wavelength data that the real-time collection and continual collection fiber-optic grating sensor is measured;
Data analysis set-up is made of data storage, data calculating, data analysis and numerical simulation coupling module, the optical wavelength data of the fiber-optic grating sensor that gathers can be carried out real-time classification storage, is calculated, analyzes; Draw corresponding temperature, strain, displacement and stress, and carry out many couplings;
Monitoring warning device, by monitoring point early warning and security evaluation module composition, the result that data analysis set-up is calculated carries out frozen construction actual time safety state analysis, single measuring point and Construction State is carried out real time security evaluation, and carry out early warning according to analysis result;
Display unit is carried out the visualization display in space with assessment result, and by the dynamic changing course curve of single measuring point, static changing course curve, the dynamic security state of single measuring point and the dynamic security state of structure consist of;
The output of described fiber-optic grating sensor links to each other with data acquisition unit, and data acquisition unit links to each other with data analysis set-up, and the output of data analysis set-up links to each other with monitoring warning device, and monitoring warning device links to each other with display unit.
The present invention also provides a kind of method of work of tunnel connection channel frozen construction security early-warning analysis instrument, and the method may further comprise the steps:
(1) in soil layer, reaches pre-buried fiber-optic grating sensor on the tunnel duct piece, and sensor is connected with data acquisition unit;
(2) at the scene by data acquisition unit Real-time Collection optical wavelength data and store;
(3) data analysis set-up calculates temperature, strain, displacement and STRESS VARIATION in real time with the optical wavelength data that gather, and carries out real-time many Numerical Simulations analysis;
(4) monitoring warning device carries out real-time assessment and carries out early warning the safe condition of construction;
(5) safe condition to construction shows the spatial visualization of implementation structure safety in display unit.
In technique scheme, described data analysis set-up handling process is as follows:
The first step, the data of initial storage are derived in preliminary treatment, and differentiations of classifying, and draw each monitoring moment wavelength of each Sensor;
Second step, single measuring point data is resolved, and the survey wavelength is calculated, and draws each monitoring temperature, strain, displacement and stress constantly corresponding to single measuring point; And can automatically draw out dynamic, static time-histories figure;
In the 3rd step, many Numerical Simulations carry out the numerical simulations such as space according to the monitoring result of single measuring point, and carry out many couplings.
In technique scheme, described monitoring warning device and display apparatus processes flow process are as follows:
The first step, model is set up, and according to construction drawing, sets up testee space three-dimensional model;
Second step, single measuring point real-time early warning, the real-time change amount of the single measuring point that calculates according to data analysis set-up adopts green, yellow, red three grades of real-time early warnings;
In the 3rd step, structural safety state real-time early warning adopts green, yellow, orange, red level Four real-time early warning according to the coupling result of the numerical simulations such as data analysis set-up space to structure;
The 4th step, the safe condition spatial visualization, the safe condition according to each measuring point and structure is differently shown in display unit.
The present invention a kind of tunnel connection channel frozen construction security early-warning analysis instrument and method of work thereof based on fiber grating adopt the safe condition of fiber grating pair tunnel connection channel frozen construction to carry out the real-time assessment early warning, have following advantage:
(1) easy to detect: based on the real-time security early warning of tunnel connection channel frozen construction of fiber grating, after only need finishing checkout equipment and arranging, the testing staff need not again to enter tunnel internal, just can automatically monitor, and then simplify observation process.
(2) detect in real time: by in the real-time security early warning of tunnel connection channel frozen construction of fiber grating, can realize uninterruptedly obtaining in real time monitored data and analyzing.
(3) precision is higher: compare traditional artificial field monitoring method, adopt the monitoring method of fiber grating, realize the temperature of tunnel connection channel frozen construction, the lifting of strain monitoring precision.
(4) intelligent decision: adopt data analyzer in real time monitored data to be resolved, monitored data and forewarn model is superimposed, and provide effect of visualization, the monitoring personnel need not to adopt traditional monitoring tool, just can judge fast construction safety state, realize intelligent construction safety state assessment.
Description of drawings
Fig. 1 is structural representation and the method for work flow chart of a kind of tunnel connection channel frozen construction of the present invention security early-warning analysis instrument.
The specific embodiment
Below in conjunction with drawings and the specific embodiments the present invention is further detailed.
As shown in Figure 1, the embodiment of the invention provides a kind of tunnel connection channel frozen construction security early-warning analysis instrument, comprises fiber-optic grating sensor, data acquisition unit, data analysis set-up, monitoring warning device and display unit.
Fiber-optic grating sensor is implanted on the testee and is connected serially to data acquisition unit;
Data acquisition unit Real-time Collection lightwave signal, and transfer to data analysis set-up;
Data analysis set-up is made of data storage, data calculating, data analysis and numerical simulation coupling module, analytical equipment carries out real-time classification storage with the lightwave signal that gathers, adopt corresponding algorithm that temperature, strain, displacement and stress are calculated according to the variation of optical wavelength, then by finite element measured object is carried out many Numerical Simulation couplings;
Monitoring warning device is by monitoring point early warning and security evaluation module composition, this device can be by above-mentioned Calculation results, in conjunction with corresponding early warning mechanism the safe condition of single measuring point is carried out the real-time assessment early warning, and analysis-by-synthesis is assessed out the actual time safety situation of Frozen Body under the Construction State, existing tunnel and service channel structure;
Display unit can show dynamic changing course curve and the static changing course curve of single measuring point, assessment result can be carried out real-time spatial visualization difference according to different level of securitys simultaneously and show, comprise that single measuring point safe condition shows and construction safety state shows.
The output of described fiber-optic grating sensor links to each other with data acquisition unit, and data acquisition unit links to each other with data analysis set-up, and the output of data analysis set-up links to each other with monitoring warning device, and monitoring warning device links to each other with display unit.
Above-described embodiment also provides a kind of method of work of tunnel connection channel frozen construction security early-warning analysis instrument, and the method may further comprise the steps:
(1) imbed in soil layer or fiber-optic grating sensor is adhered in the existing tunnel section of jurisdiction, sensor is with optical fiber cable and flange series connection, access data harvester;
(2) lightwave signal that spreads out of of each sensor of data acquisition unit Real-time Collection, i.e. optical wavelength data, and the storage of in data analysis set-up, classifying;
(3) early warning mechanism of the single measuring point of formulation, warning value, threshold, relative threshold and the absolute threshold of temperature, strain, displacement and the stress of single measuring point of definite different construction stages, and import the fiber grating analyzer; The safe condition of the single measuring point of regulation shows as average risk, significantly three grades of risk and excessive risks simultaneously, uses respectively green, yellow, red three kinds of color marks;
(4) data analysis set-up calculates the wavelength of storage in real time, and design formulas is as follows:
In the following formula:
ε
AlwaysBe strain capacity, the μ ε of unit; B is the sensor temperature correction factor, the μ ε/nm of unit; λ
1Be the current wavelength value of strain grating (nm);
ε is strain capacity, the μ ε of unit; λ
0Be the initial wavelength value of strain grating (nm); λ
T1Be the current wavelength value of temperature compensation grating (nm);
K is the strain meter coefficient of strain (μ ε/nm); λ
T0Be the initial wavelength value of temperature compensation grating (nm);
α is the testee coefficient of thermal expansion, and (μ ε/℃) gets in unit.
The temperature that draws and strain further calculate corresponding displacement and stress according to the modulus of elasticity of frozen soil and existing tunnel section of jurisdiction;
The early warning value of single measuring point of the temperature that (5) calculates, strain, displacement and stress value and formulation carries out match, draws the actual time safety state of single measuring point;
(6) data analysis set-up adopts the method for finite element in real time each data that has calculated to be carried out numerical simulation, is coupled out the temperature of frozen soil, existing tunnel and service channel structure, stressed and deformation state;
(7) formulate the advanced warning grade of frozen soil, existing tunnel and service channel structure, be divided into average risk, significantly risk, excessive risk and serious risk level Four, and with green, yellow, orange and red four kinds of color marks;
The temperature of the frozen soil that (8) is coupled out according to data analysis set-up, existing tunnel and service channel structure, stressed and deformation state are made real-time security state evaluation by monitoring warning device to it;
(9) frozen soil, existing tunnel and service channel structure are carried out the three dimensions modeling, carry out correspondingly with sensing station, and store in the monitoring warning device;
(10) the actual time safety state of single measuring point and frozen soil, existing tunnel and service channel structure shown in display unit.
Claims (4)
1. a tunnel connection channel frozen construction security early-warning analysis instrument is characterized in that: comprise fiber-optic grating sensor, data acquisition unit, data analysis set-up, monitoring warning device and display unit;
Fiber-optic grating sensor is used for the variation of perception service channel frozen soils construction temperature and strain; Fiber-optic grating sensor comprises sensor, optical fiber cable and flange, during use fiber-optic grating sensor is implanted to be frozen the soil body or to be fixed on the tunnel duct piece, with flange sensor is connected with optical fiber cable, and is connected serially to data acquisition unit;
Data acquisition unit is used for the optical wavelength data that the real-time collection and continual collection fiber-optic grating sensor is measured;
Data analysis set-up is made of data storage, data calculating, data analysis and numerical simulation coupling module, the optical wavelength data of the fiber-optic grating sensor that gathers can be carried out real-time classification storage, is calculated, analyzes; Draw corresponding temperature, strain, displacement and stress, and carry out many couplings;
Monitoring warning device, by monitoring point early warning and security evaluation module composition, the result that data analysis set-up is calculated carries out frozen construction actual time safety state analysis, single measuring point and Construction State is carried out real time security evaluation, and carry out early warning according to analysis result;
Display unit is carried out the visualization display in space with assessment result, and by the dynamic changing course curve of single measuring point, static changing course curve, the dynamic security state of single measuring point and the dynamic security state of structure consist of;
The output of described fiber-optic grating sensor links to each other with data acquisition unit, and data acquisition unit links to each other with data analysis set-up, and the output of data analysis set-up links to each other with monitoring warning device, and monitoring warning device links to each other with display unit.
2. the method for work of a tunnel connection channel frozen construction security early-warning analysis instrument as claimed in claim 1 is characterized in that the method may further comprise the steps:
(1) in soil layer, reaches pre-buried fiber-optic grating sensor on the tunnel duct piece, and fiber-optic grating sensor is connected with data acquisition unit;
(2) at the scene by data acquisition unit Real-time Collection optical wavelength data and store;
(3) data analysis set-up calculates temperature, strain, displacement and STRESS VARIATION in real time with the optical wavelength data that gather, and carries out real-time many Numerical Simulations analysis;
(4) monitoring warning device carries out real-time assessment and carries out early warning the safe condition of construction;
(5) safe condition to construction shows the spatial visualization of implementation structure safety in display unit.
3. the method for work of a kind of tunnel connection channel frozen construction security early-warning analysis instrument according to claim 2 is characterized in that described data analysis set-up handling process is as follows:
The first step, the data of initial storage are derived in preliminary treatment, and differentiations of classifying, and draw each monitoring moment wavelength of each Sensor;
Second step, single measuring point data is resolved, and the survey wavelength is calculated, and draws each monitoring temperature, strain, displacement and stress constantly corresponding to single measuring point; And can automatically draw out dynamic, static time-histories figure;
In the 3rd step, many Numerical Simulations carry out the numerical simulations such as space according to the monitoring result of single measuring point, and carry out many couplings.
4. the method for work of a kind of tunnel connection channel frozen construction security early-warning analysis instrument according to claim 2 is characterized in that described monitoring warning device and display apparatus processes flow process are as follows:
The first step, model is set up, and according to construction drawing, sets up testee space three-dimensional model;
Second step, single measuring point real-time early warning, the real-time change amount of the single measuring point that calculates according to data analysis set-up adopts green, yellow, red three grades of real-time early warnings;
In the 3rd step, structural safety state real-time early warning adopts green, yellow, orange, red level Four real-time early warning according to the coupling result of the numerical simulations such as data analysis set-up space to structure;
The 4th step, the safe condition spatial visualization, the safe condition according to each measuring point and structure is differently shown in display unit.
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| CN113255151B (en) * | 2021-06-08 | 2024-03-12 | 长安大学 | Tunnel construction deformation prediction method and system based on composite neural network |
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| CN101667328B (en) * | 2008-09-03 | 2011-04-20 | 中国石油天然气股份有限公司 | Method and system for monitoring and warning pipeline landslide surface displacement and method for constructing system |
| CN101519979A (en) * | 2009-04-09 | 2009-09-02 | 中铁二局股份有限公司 | Tunnel gas monitoring system |
| CN102042030B (en) * | 2010-12-17 | 2012-07-04 | 华中科技大学 | Construction tunnel safety protection method based on wireless sensor network and a monitoring system thereof |
| CN202140118U (en) * | 2011-07-25 | 2012-02-08 | 中铁二十一局集团有限公司 | Tunnel construction safety early warning system based on three-dimensional digital tunnel platform |
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