CN113701706A - Tunnel deformation monitoring optical fiber testing method and system - Google Patents

Tunnel deformation monitoring optical fiber testing method and system Download PDF

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CN113701706A
CN113701706A CN202110957905.8A CN202110957905A CN113701706A CN 113701706 A CN113701706 A CN 113701706A CN 202110957905 A CN202110957905 A CN 202110957905A CN 113701706 A CN113701706 A CN 113701706A
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monitoring
foundation pit
water pressure
tunnel
main control
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CN113701706B (en
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王兴
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Nanjing University Suzhou High Tech Institute
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Nanjing University Suzhou High Tech Institute
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/32Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00Investigation of foundation soil in situ
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00Thermometers specially adapted for specific purposes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • GPHYSICS
    • G08SIGNALLING
    • G08CTRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C23/00Non-electrical signal transmission systems, e.g. optical systems
    • G08C23/06Non-electrical signal transmission systems, e.g. optical systems through light guides, e.g. optical fibres
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/18Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/181Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q9/00Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

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  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Soil Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

The invention discloses a tunnel deformation monitoring optical fiber testing method and system, which comprises a data transmission system, a step monitoring and measuring system, a foundation pit surrounding soil pressure monitoring system, a water pressure monitoring system and a video acquisition system, wherein data information monitored by the step monitoring and measuring system, the foundation pit surrounding soil pressure monitoring system and the water pressure monitoring system is transmitted to a main control center through the data transmission system, and then data analysis is carried out through the main control center. The acquired data is compared with the initially set threshold value (namely within the error range) one by one, and when the identified parameter information shown by any system exceeds the set threshold value, an early warning notice of tunnel deformation is sent out, so that the monitoring range of tunnel deformation identification is improved, the identification rate of monitoring is improved, and the early warning condition of tunnel deformation is controlled more accurately.

Description

Tunnel deformation monitoring optical fiber testing method and system
Technical Field
The invention belongs to the technical field of safety monitoring of tunnel engineering, and particularly relates to a tunnel deformation monitoring optical fiber testing method and system.
Background
The tunnel is used as underground construction engineering in the existing capital construction and is divided into a traffic tunnel, a hydraulic tunnel, a municipal tunnel, a mine tunnel and the like according to different use purposes.
After the tunnel is excavated, due to the stress release of the initial ground stress field, the surrounding rock is deformed in various forms, such as vault sinking, surrounding rock intrusion at two sides, bottom bulging, tunnel face extrusion and the like, and the surrounding rock is easily loosened due to the deformation, so that the tunnel is collapsed or unstable when the deformation or the relaxation of the surrounding rock exceeds a certain range.
In order to guarantee construction safety, in the tunnel construction process, the deformation condition of a tunnel needs to be detected in real time in the construction process, even position change, water seepage change, water pressure change and other numerous data around surrounding rocks need to be collected in time, most of data are detected by digital monitoring equipment, but different data lack in-time analysis capability, for example, in the controllable range of surrounding rock position change, larger water seepage occurs, unnecessary surrounding rock deformation danger can be caused, and the data need to be processed in time. The current monitoring means is single, and the concrete deformation condition of the tunnel cannot be detected and identified from a plurality of data
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method and a system for testing a tunnel deformation monitoring optical fiber, which solve the technical problems in the prior art.
The purpose of the invention can be realized by the following technical scheme:
a tunnel deformation monitoring optical fiber testing system comprises a data transmission system, a step pitch monitoring and measuring system, a foundation pit surrounding soil pressure monitoring system, a water pressure monitoring system and a video acquisition system,
the step monitoring and measuring system comprises: through the synergistic effect of the laser sensor and the angle sensor, two safe steps of the face of the permanent and the inverted arch can be measured simultaneously, and the measured data information is transmitted to the main control center through the data transmission system;
the foundation pit soil surrounding pressure monitoring system comprises: the system is used for monitoring the pressure value change of the surrounding soil around the tunnel foundation pit and transmitting the monitored data information to the main control center through the data transmission system;
the water pressure monitoring system comprises: the water pressure sensors are arranged at different heights in the same foundation pit, the water pressure in the foundation pit is detected in real time, the change conditions of the water pressure sensors at different heights are transmitted in real time, and data information is transmitted to the main control center through the data transmission system;
the video acquisition system consists of a plurality of video shooting modules, the video shooting modules are enabled to display the conditions in the whole tunnel in real time, video stream information is formed, and the video stream information is transmitted to the main control center through the data transmission system;
and the main control center monitors the deformation condition of the tunnel and sends out deformation early warning information in real time after summarizing the information collected by the step pitch monitoring and measuring system, the foundation pit surrounding soil pressure monitoring system, the water pressure monitoring system and the video collecting system.
Furthermore, the step monitoring and measuring system measures distance error of less than 0.1 meter, angle error of less than 0.1 meter and comprehensive error of less than 0.3 meter in a laser measuring mode.
Further, the foundation pit soil surrounding pressure monitoring system comprises: punching along the hole opening direction of the foundation pit in the tunnel, positioning the surrounding soil around the foundation pit along the surrounding soil of the foundation pit, taking the coordinate record of the positioned mark point as a standard reference, then photographing at the same angle at intervals, and comparing the position change of the mark point in each time.
Furthermore, be provided with water pressure detector and thermodetector among the water pressure monitoring system, through the multiunit the water pressure condition of co-altitude in the water pressure detector detection foundation ditch, the real-time temperature in the foundation ditch is detected to thermodetector simultaneously.
Further, the data transmission system uploads the monitored data to a main control center in the form of electric signals through an A/D converter, the main control center restores the electric signals into testing digital signals, and the restored digital signals are stored in a database;
the testing digital signals provided by various monitoring systems are compared through the comprehensive monitoring platform, compared results are analyzed, judgment is made, and meanwhile workers are informed to process the testing digital signals in time.
Furthermore, the foundation pit surrounding soil pressure monitoring system is provided with a surrounding soil pressure filtering module for filtering pressure change around the foundation pit surrounding soil caused by artificial damage; the water pressure monitoring system is provided with a water pressure filtering module and filters the water pressure change caused by external water injection in the foundation pit through the water pressure filtering module.
Furthermore, independent power supply systems are adopted among the step monitoring and measuring system, the foundation pit soil surrounding pressure monitoring system, the water pressure monitoring system and the video acquisition system for power supply operation.
The tunnel deformation monitoring optical fiber testing method comprises the following steps:
s1, monitoring and measuring two safe steps of the permanent surface and the inverted arch by a step monitoring and measuring system, monitoring the pressure value of the soil surrounding the tunnel foundation pit by a foundation pit surrounding soil pressure monitoring system, detecting the numerical value change of water pressure and water temperature in the foundation pit by a water pressure monitoring system, converting digital information into an electric signal and transmitting the electric signal to a main control center by a data transmission system;
s2, converting the electric signals collected by the monitoring systems received by the main control center into digital signals, simultaneously, firstly, independently obtaining the information collected by each monitoring system, comparing the information with the initially set threshold value one by one, when the monitored digital information is in the initially set threshold value range, not sending out a prompt, and transmitting the digital signals to the comprehensive monitoring platform; when the monitored digital information exceeds the initially set threshold range, immediately sending out a prompt through an externally connected alarm device;
and S3, when the comprehensive monitoring platform receives the digital signals, comparing the signals collected by each monitoring system pairwise, transmitting the compared signals to a comparison module in the comprehensive monitoring platform, carrying out secondary comparison on the collected signals by the comparison module to obtain a preset value, when the preset value is exceeded, sending a prompt through an external alarm device, otherwise, not sending the prompt.
The invention has the beneficial effects that:
1. the whole system firstly detects physical change parameter acquisition caused by deformation in the tunnel through a distance monitoring and measuring system, a foundation pit soil surrounding pressure monitoring system and a water pressure monitoring system respectively. And the acquired data is compared with the initially set threshold value (namely within the error range) one by one, and when the identified parameter information shown by any system exceeds the set threshold value, an early warning notice of tunnel deformation is sent out, so that the monitoring range of tunnel deformation identification is enlarged.
2. In the method adopted by the system, when the detected data do not exceed the initial threshold set by each independent system one by one, two-to-two comparison of each parameter is required, so that the misjudgment condition of the whole system is reduced, the data between the distance monitoring and measuring system, the foundation pit soil surrounding pressure monitoring system and the water pressure monitoring system are integrated, the monitoring identification rate is improved, and the tunnel deformation early warning condition is controlled more accurately.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall flow structure of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a control structure of an embodiment of the present invention;
fig. 3 is a schematic view of the overall structure of the step monitoring and measuring system according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, an embodiment of the present invention provides a tunnel deformation monitoring optical fiber testing system, which includes a data transmission system, a step monitoring and measuring system, a foundation pit surrounding soil pressure monitoring system, a water pressure monitoring system, a video acquisition system, and a main control center.
As shown in fig. 3, the step monitoring and measuring system: through the synergistic effect of the laser sensor and the angle sensor, two safe steps of the face of the permanent and the inverted arch can be measured simultaneously, and the measured data information is transmitted to the main control center through the data transmission system. The step pitch monitoring and measuring system adopts a laser measuring mode, the measuring distance error is less than 0.1 meter, the angle error is less than 0.1 meter, and the comprehensive error is less than 0.3 meter. Through the synergistic effect of laser sensor and angle sensor, can measure two safe steps of face and inverted arch simultaneously, reduce the measurement cost.
Foundation pit soil surrounding pressure monitoring system: punching along the hole opening direction of the foundation pit in the tunnel, positioning the surrounding soil around the foundation pit along the surrounding soil of the foundation pit, taking the coordinate record of the positioned mark point position as a standard reference, then photographing at the same angle at intervals, comparing the position change of the mark point in each period, and transmitting the monitored data information to the main control center through the data transmission system.
The water pressure monitoring system comprises: the water pressure sensors are arranged at different heights in the same foundation pit and used for detecting the water pressure in the foundation pit in real time, then the change conditions of the water pressure sensors at different heights are transmitted in real time, meanwhile, the water pressure monitoring system is also provided with a temperature detector, the temperature in the foundation pit is detected through the temperature detector, and data information is transmitted to the main control center through the data transmission system.
The video acquisition system consists of a plurality of video shooting modules, the video shooting modules are enabled to display the conditions in the whole tunnel in real time, video stream information is formed, and the video stream information is transmitted to the main control center through the data transmission system; the video stream information is stored in the database, so that the specific conditions in the tunnel can be observed in real time at the later stage conveniently, and the time period can be randomly called.
And after the main control center collects the information collected by the step pitch monitoring and measuring system, the foundation pit surrounding soil pressure monitoring system, the water pressure monitoring system and the video collecting system, monitoring the deformation condition of the tunnel and sending out deformation early warning information in real time.
The data transmission system uploads the monitored data to the main control center in an electric signal form through an A/D converter, the main control center restores the electric signal into a test digital signal, and the restored digital signal is stored in a database;
the testing digital signals provided by various monitoring systems are compared through the comprehensive monitoring platform, compared results are analyzed, judgment is made, and meanwhile workers are informed to process the testing digital signals in time.
The foundation pit surrounding soil pressure monitoring system is provided with a surrounding soil pressure filtering module for filtering pressure change around foundation pit surrounding soil caused by artificial damage; the water pressure monitoring system is provided with a water pressure filtering module and filters the water pressure change caused by external water injection in the foundation pit through the water pressure filtering module.
Independent power supply systems are adopted among the step monitoring and measuring system, the foundation pit surrounding soil pressure monitoring system, the water pressure monitoring system and the video acquisition system for power supply operation.
The tunnel deformation monitoring optical fiber testing method comprises the following steps:
s1, the step pitch monitoring and measuring system monitors and measures two safe step pitches of the permanent face and the inverted arch, the foundation pit surrounding soil pressure monitoring system monitors the pressure value of surrounding soil around the tunnel foundation pit, the water pressure monitoring system detects the numerical value change of water pressure and water temperature in the foundation pit, and digital information is converted into an electric signal and transmitted to the main control center through the data transmission system.
S2, converting the electric signals collected by the monitoring systems received by the main control center into digital signals, simultaneously, firstly, independently obtaining the information collected by each monitoring system, comparing the information with the initially set threshold value one by one, when the monitored digital information is in the initially set threshold value range, not sending out a prompt, and transmitting the digital signals to the comprehensive monitoring platform; when the monitored digital information exceeds the initially set threshold range, a prompt is immediately sent out through an externally connected alarm device.
S3, when the comprehensive monitoring platform receives the digital signals, the signals collected by each monitoring system are compared pairwise, the compared signals are transmitted to a comparison module in the comprehensive monitoring platform, the comparison module carries out secondary comparison on the collected signals to obtain preset values, when the preset values are exceeded, a prompt is sent out through an external alarm device, and otherwise, the prompt is not sent out.
The whole system firstly detects physical change parameter acquisition caused by deformation in the tunnel through a distance monitoring and measuring system, a foundation pit soil surrounding pressure monitoring system and a water pressure monitoring system respectively. And comparing the acquired data with the initially set threshold value (namely within the error range) one by one, and sending out early warning notice of tunnel deformation when the acquired data exceeds the set threshold value.
When the detected data do not exceed the initial threshold set by each independent system in one-to-one comparison, two-to-two comparison of each parameter is needed, so that the misjudgment condition of the whole system is reduced, the data between the distance monitoring and measuring system, the foundation pit soil surrounding pressure monitoring system and the water pressure monitoring system are integrated, the monitoring identification rate is improved, and the tunnel deformation early warning condition is controlled more accurately.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims (8)

1. The utility model provides a tunnel deformation monitoring optical fiber test system, includes data transmission system, step monitoring measurement system, foundation ditch enclosing soil pressure monitoring system, water pressure monitoring system, video acquisition system, its characterized in that:
the step monitoring and measuring system comprises: through the synergistic effect of the laser sensor and the angle sensor, two safe steps of the face of the permanent and the inverted arch are measured simultaneously, and the measured data information is transmitted to the main control center through the data transmission system;
the foundation pit soil surrounding pressure monitoring system comprises: the system is used for monitoring the pressure value change of the surrounding soil around the tunnel foundation pit and transmitting the monitored data information to the main control center through the data transmission system;
the water pressure monitoring system comprises: the water pressure sensors are arranged at different heights in the same foundation pit, the water pressure in the foundation pit is detected in real time, the change conditions of the water pressure sensors at different heights are transmitted in real time, and data information is transmitted to the main control center through the data transmission system;
the video acquisition system consists of a plurality of video shooting modules, the video shooting modules are enabled to display the conditions in the whole tunnel in real time, video stream information is formed, and the video stream information is transmitted to the main control center through the data transmission system;
and the main control center monitors the deformation condition of the tunnel and sends out deformation early warning information in real time after summarizing the information collected by the step pitch monitoring and measuring system, the foundation pit surrounding soil pressure monitoring system, the water pressure monitoring system and the video collecting system.
2. The system for testing the tunnel deformation monitoring optical fiber according to claim 1, wherein the step pitch monitoring and measuring system measures distance error <0.1 m, angle error <0.1 m, and comprehensive error <0.3 m by means of laser measurement.
3. The tunnel deformation monitoring optical fiber testing system according to claim 1, wherein the foundation pit soil surrounding pressure monitoring system: punching along the hole opening direction of the foundation pit in the tunnel, positioning the surrounding soil around the foundation pit along the surrounding soil of the foundation pit, recording the coordinates of the positioned mark points as a standard reference, and then photographing at the same angle at intervals.
4. The system for testing the tunnel deformation monitoring optical fiber according to claim 1, wherein a water pressure detector and a temperature detector are arranged in the water pressure monitoring system, a plurality of groups of water pressure detectors are used for detecting water pressure conditions at different heights in the foundation pit, and the temperature detector is used for detecting real-time temperature in the foundation pit.
5. The system for testing the tunnel deformation monitoring optical fiber according to claim 1, wherein the data transmission system uploads the monitored data to a main control center in the form of an electrical signal through an optical fiber by an A/D converter, the main control center restores the electrical signal into a test digital signal, and stores the restored digital signal in a database;
the testing digital signals provided by various monitoring systems are compared through the comprehensive monitoring platform, compared results are analyzed, judgment is made, and meanwhile workers are informed to process the testing digital signals in time.
6. The tunnel deformation monitoring optical fiber testing system according to claim 1, wherein the foundation pit surrounding soil pressure monitoring system is provided with a surrounding soil pressure filtering module for filtering pressure changes occurring around the foundation pit surrounding soil due to artificial damage; the water pressure monitoring system is provided with a water pressure filtering module and filters the water pressure change caused by external water injection in the foundation pit through the water pressure filtering module.
7. The tunnel deformation monitoring optical fiber testing system according to claim 1, wherein independent power supply systems are adopted for power supply operation among the step pitch monitoring and measuring system, the foundation pit surrounding soil pressure monitoring system, the water pressure monitoring system and the video acquisition system.
8. The method for testing a tunnel deformation monitoring optical fiber according to any one of claims 1 to 7, characterized by comprising the steps of:
s1, monitoring and measuring two safe steps of the permanent surface and the inverted arch by a step monitoring and measuring system, monitoring the pressure value of the soil surrounding the tunnel foundation pit by a foundation pit surrounding soil pressure monitoring system, detecting the numerical value change of water pressure and water temperature in the foundation pit by a water pressure monitoring system, converting digital information into an electric signal and transmitting the electric signal to a main control center by a data transmission system;
s2, converting the electric signals collected by the monitoring systems received by the main control center into digital signals, simultaneously, firstly, independently obtaining the information collected by each monitoring system, comparing the information with the initially set threshold value one by one, when the monitored digital information is in the initially set threshold value range, not sending out a prompt, and transmitting the digital signals to the comprehensive monitoring platform; when the monitored digital information exceeds the initially set threshold range, immediately sending out a prompt through an externally connected alarm device;
and S3, when the comprehensive monitoring platform receives the digital signals, comparing the signals collected by each monitoring system pairwise, transmitting the compared signals to a comparison module in the comprehensive monitoring platform, carrying out secondary comparison on the collected signals by the comparison module to obtain a preset value, when the preset value is exceeded, sending a prompt through an external alarm device, otherwise, not sending the prompt.
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