CN117315892B - Automatic geological disaster monitoring device and monitoring method - Google Patents
Automatic geological disaster monitoring device and monitoring method Download PDFInfo
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- CN117315892B CN117315892B CN202311596230.4A CN202311596230A CN117315892B CN 117315892 B CN117315892 B CN 117315892B CN 202311596230 A CN202311596230 A CN 202311596230A CN 117315892 B CN117315892 B CN 117315892B
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Abstract
The invention discloses an automatic monitoring device and a monitoring method for geological disasters, which are used for monitoring and early warning of landslide areas. The device can more accurately judge the occurrence possibility of landslide disasters, reduces the risk of misjudgment in the process of realizing automatic monitoring, and improves the accuracy of the prediction result.
Description
Technical Field
The invention relates to the technical field of geological disaster monitoring, in particular to an automatic geological disaster monitoring device and an automatic geological disaster monitoring method.
Background
The geological disaster monitoring technology is a comprehensive technical system integrating multiple disciplines and technologies such as geology, measurment, physics, electronic technology and the like, and the geological disaster monitoring, early warning, forecasting and preventing work has occupied a non-negligible position in national economic construction. In order to meet urgent needs of geological disaster monitoring and early warning, new technical research of geological disaster monitoring must be developed, advanced technology and instruments are adopted to monitor geological disaster bodies, and monitoring data are used for geological disaster early warning and forecasting after being analyzed and processed.
The accurate prediction and forecast of landslide are the precondition of disaster prevention and reduction, and are also the world scientific problems to be broken through urgently, the current monitoring technology is often to monitor single measurement physical quantity, such as rock stress, underground water level, image detection and the like, and the occurrence of landslide cannot be effectively judged, and because the inoculation and development process of landslide is a very long process, especially in the creep stage of landslide, an effective automatic monitoring method for landslide disasters is urgently needed.
Disclosure of Invention
Aiming at the problems, the invention provides a technical scheme that:
in one aspect, the present invention provides an automatic geological disaster monitoring device for monitoring and early warning of landslide areas, the device comprising: the system comprises an electric signal monitoring module, an optical signal monitoring module, a signal analysis module, a wireless communication module, an early warning device and remote terminal equipment.
The electric signal monitoring module comprises at least 3 groups of coaxial cables which are vertically buried in a soil layer of a target monitoring area, the coaxial cables are connected with the TDR measuring instrument, and reflected signals of pulse signals emitted by a signal source in the coaxial cables are received.
The optical signal monitoring module comprises an optical signal device erected above a target monitoring area, wherein the optical signal device comprises an optical signal generating source, an optical signal receiver and at least 1 transmission prism.
The optical signal equipment is arranged right above the coaxial cable, and the TDR measuring instrument and the optical signal receiver are respectively connected with the signal analysis module.
The signal analysis module generates a signal analysis result according to the received signal data and a preset operation model, and transmits the signal data and the signal analysis result to the remote terminal device through the wireless communication module.
Further, the signal analysis module is further connected with an early warning device, the early warning device is arranged around the target monitoring area, the signal analysis module is preset with a deformation threshold value and a path offset threshold value, and when the signal analysis result exceeds the threshold value, the early warning device automatically generates early warning information.
Further, the coaxial cable is fixed through the dead lever, the dead lever is the metal pipe, coaxial cable passes through the bandage and restrains in the pipe outside. The burial depth of the coaxial cable is at least 3 meters above the bottom of the deepest sliding belt, the length of the coaxial cable is not less than 5 meters, and the ground leakage part of the fixing rod is not more than 1.5 meters.
Further, the upper end of the fixing rod is connected with an optical signal device, an optical signal generating source, an optical signal receiver and at least 1 transmission prism are respectively connected with different fixing rods to form an optical signal transmission monitoring path.
The optical signal generating source emits a laser beam at a signal collection period, the laser beam being captured by the optical signal receiver after being refracted by the transmission prism, the optical signal receiver.
Adjusting the optical signal device to capture the laser beam emitted by the generating source at the right center of the receiving window of the optical signal receiver, and generating initial current signal intensity through photoelectric conversionAccording to the current signal intensity at time t +.>And the initial current signal strength +.>And calculating the optical signal path offset at the time t.
Further, the signal analysis module performs monitoring analysis based on the data collected by the TDR measuring instrument and the optical signal receiving processor.
Coaxial cable is measured to TDR measuring apparatuReflected voltage amplitude +.>The signal analysis module is used for analyzing the reflected voltage according to the reflected voltage amplitude +.>Calculating the deformation of the coaxial cable>。
Wherein z is the characteristic impedance of the coaxial cable in the forward direction without extrusion deformation,is the decay constant of the pulse signal, < >>Is the phase constant of the pulse signal, +.>For the reflected voltage amplitude at the initial time, L is the length of the coaxial cable,the voltage reflection coefficient at the deformation point, k, is a constant, and 0.257 is taken.
Further, the optical signal receiver collectsTime optical signal offset by an offset distance of the optical signal receiver center>The signal analysis module is according to the offset distance +.>Calculating the optical signal path offset>。
，/>
Wherein the method comprises the steps ofIs->And the optical signal is offset by the offset distance of the center of the optical signal receiver at the moment, and R is the radius of a receiving window of the optical signal receiver.
Further, the signal analysis module is preset with a deformation threshold m and a path offset threshold n, wherein m is 1-10 mm, n is 0.5-5 mm, and the sampling time interval is 60-240 minutes.
When the deformation isLess than threshold m, or optical signal path offset +.>And when the threshold value n is smaller than the threshold value n, no early warning is performed.
When the deformation isGreater than or equal to threshold m, and optical signal path offset +.>And when the threshold value n is greater than or equal to the threshold value n, automatically giving out early warning.
Further, the apparatus further comprises: the power supply module comprises an auxiliary power supply and a main power supply, wherein the main power supply is used for supplying power to the electric signal monitoring module, the optical signal monitoring module, the signal analysis module and the early warning device, the auxiliary power supply is used for supplying power to the wireless communication module, and is connected with the remote terminal equipment through the wireless communication module, and the wireless communication module receives the instruction of the remote terminal equipment to control the main power supply to work or sleep.
Further, the early warning device comprises a display screen and an audible and visual reminding unit, wherein the display screen is used for displaying warning characters, and the audible and visual reminding unit is used for emitting light signals and/or alarm beeps.
On the other hand, the invention provides an automatic geological disaster monitoring method for monitoring and early warning of landslide areas, which comprises the following steps:
step S1, at least 3 groups of coaxial cables and optical signal equipment are arranged in a target monitoring area, the coaxial cables are vertically buried through a fixed rod and penetrate through a sliding belt, and the optical signal equipment is arranged at the upper end of the fixed rod.
And S2, measuring the reflected voltage amplitude of the coaxial cable and the current signal intensity received by the optical signal equipment, and calculating the deformation of the coaxial cable and the offset of the light-emitting signal path.
And step S3, comparing the deformation of the coaxial cable and the deviation of the light-emitting signal path with a preset threshold value, and judging whether to send out early warning.
Further, in step S1, the coaxial cable is fixed by a fixing rod, the fixing rod is a metal round tube, and the coaxial cable is bound on the outer side of the round tube by a binding band. The burial depth of the coaxial cable is at least 3 meters above the bottom of the deepest sliding belt, the length of the coaxial cable is not less than 5 meters, and the ground leakage part of the fixing rod is not more than 1.5 meters. The upper end of the fixed rod is connected with optical signal equipment, the optical signal generating source, the optical signal receiver and at least 1 transmission prism are respectively connected with different fixed rods to form an optical signal transmission monitoring path.
Further, in step S2, the coaxial cableReflected voltage amplitude +.>According to the amplitude of the reflected voltageCalculating the deformation of the coaxial cable>。
Wherein z is the characteristic impedance of the coaxial cable in the forward direction without extrusion deformation,is the decay constant of the pulse signal, < >>Is the phase constant of the pulse signal, +.>For the reflected voltage amplitude at the initial time, L is the length of the coaxial cable,the voltage reflection coefficient at the deformation point, k, is a constant, and 0.257 is taken.
Further, the optical signal receiver collectsTime optical signal offset by an offset distance of the optical signal receiver center>According to the offset distance->Calculating the optical signal path offset>。
，/>
Wherein the method comprises the steps ofIs->And the optical signal is offset by the offset distance of the center of the optical signal receiver at the moment, and R is the radius of a receiving window of the optical signal receiver.
Further, in step S3, the preset threshold includes: a deformation threshold m and a path offset threshold n, wherein m is 1-10 mm, n is 0.5-5 mm, and the sampling time interval is 60-240 minutes.
When the deformation isLess than threshold m, or optical signal path offset +.>And when the threshold value n is smaller than the threshold value n, no early warning is performed.
When the deformation isGreater than or equal to threshold m, and optical signal path offset +.>And when the threshold value n is greater than or equal to the threshold value n, automatically giving out early warning.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the electric signal monitoring module and the optical signal monitoring module are arranged at the monitoring point, so that the influence of the movement trend of the sliding surface on the deformation of the ground of the target area is synchronously monitored while the deformation of the sliding surface in the landslide creep stage is concerned, the occurrence possibility of landslide disasters can be more accurately judged, the risk of misjudgment is reduced in the process of realizing automatic monitoring, and the accuracy of the prediction result is improved.
Drawings
Fig. 1 is a schematic diagram of an automatic geological disaster monitoring device according to the present invention.
Fig. 2 is a schematic diagram of an arrangement of an automatic geological disaster monitoring device according to the present invention.
Fig. 3 is a flowchart of an automatic monitoring method for geological disasters.
In the figure, 1-fixed rod, 2-optical signal generating source, 3-transmission prism, 4-optical signal receiver, 5-sliding belt and 6-stable rock face.
Detailed Description
The technical scheme of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
For the purpose of making the technical solution and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention.
Example 1
The embodiment discloses an automatic monitoring device for geological disasters, which is used for monitoring and early warning of landslide areas.
As shown in fig. 1-2, the automatic geological disaster monitoring device includes: the system comprises an electric signal monitoring module, an optical signal monitoring module, a signal analysis module, a wireless communication module, an early warning device and remote terminal equipment.
It should be noted that, in this embodiment, the displacement variable of the slip zone 5 is measured by using TDR (time domain reflectometry), and the deformation process of the coaxial cable is a very slow change process, especially the deformation of the coaxial cable is very small in the creep stage of the landslide. With the continuous development of landslide deformation, the deformation of the landslide body enables the coaxial cable to deform until the coaxial cable is completely disconnected, even when landslide occurs, as long as an inner conductor (a core wire) or an outer conductor (a shielding layer) of the coaxial cable is not completely disconnected, a TDR signal always exists at the deformation position of the coaxial cable, and the TDR landslide monitoring system can always monitor the signal. Therefore, the TDR technology is adopted to monitor landslide, and the landslide is only related to the on-off of the coaxial cable, and the damage degree of the monitored drilling hole is little influenced.
When the device is arranged, the electric signal monitoring module comprises at least 3 groups of coaxial cables which are vertically buried in the soil layer of the target monitoring area, the coaxial cables are connected with the TDR measuring instrument, and reflected signals of pulse signals emitted by the signal source in the coaxial cables are received. The optical signal monitoring module includes an optical signal device including an optical signal generating source 2, an optical signal receiver 4, and at least 1 transmission prism 3, which is installed above a target monitoring area.
Before TDR monitoring, a borehole must be prepared in advance on the landslide body, and when drilling, the borehole is required to be as vertical as possible, and the deviation of plumb degree is less than 2 degrees. During installation of the coaxial cable, the end of the coaxial cable should be sealed in advance before it can be lowered to the bottom of the monitoring borehole.
The optical signal device is arranged right above the coaxial cable, and the TDR measuring instrument and the optical signal receiver 4 are respectively connected with the signal analysis module. The signal analysis module generates a signal analysis result according to the received signal data and a preset operation model, and transmits the signal data and the signal analysis result to the remote terminal equipment through the wireless communication module.
The signal analysis module is also connected with the early warning device, the early warning device is arranged around the target monitoring area, the signal analysis module is preset with a deformation threshold value and a path offset threshold value, and when the signal analysis result exceeds the threshold value, the early warning device automatically generates early warning information.
It should be noted that, coaxial cable passes through dead lever 1 to be fixed, and dead lever 1 is the metal pipe, and coaxial cable passes through the bandage and restraines in the pipe outside. The embedded depth of the coaxial cable at least exceeds 3 meters at the bottom of the deepest sliding belt 5, and is preferably fixed on the stable rock surface 6, the length of the coaxial cable is not less than 5 meters, and the part of the fixed rod 1 leaking out of the ground is not more than 1.5 meters.
The TDR signal characteristics of the coaxial cable are obvious due to the thicker wire diameter. In actual monitoring of landslide, SYWY-75-12 type coaxial cable is selected in most cases.
The upper end of the fixing rod 1 is connected with an optical signal device, and the optical signal generating source 2, the optical signal receiver 4 and at least 1 transmission prism 3 are respectively connected with different fixing rods 1 to form an optical signal transmission monitoring path.
The optical signal generating source 2 emits a laser beam in a signal collection period, and the laser beam is captured by the optical signal receiver 4 after being refracted by the transmission prism 3, the optical signal receiver 4.
The optical signal device is adjusted so that the laser beam emitted by the generation source is captured by the very center of the receiving window of the optical signal receiver 4, and the initial current signal intensity is generated through photoelectric conversionAccording to the current signal intensity at time t +.>And the initial current signal strength +.>And calculating the optical signal path offset at the time t.
The signal analysis module monitors and analyzes based on the data collected by the TDR measuring instrument and the optical signal receiving processor.
Coaxial cable for measuring TDR measuring instrumentReflected voltage amplitude +.>The signal analysis module is according to the reflected voltage amplitude +.>Calculating the deformation of the coaxial cable>。
Wherein z is the characteristic impedance of the coaxial cable in the forward direction without extrusion deformation,is the decay constant of the pulse signal, < >>Is the phase constant of the pulse signal, +.>For the reflected voltage amplitude at the initial time, L is the length of the coaxial cable,the voltage reflection coefficient at the deformation point, k, is a constant, and 0.257 is taken.
Optical signal receiver 4 acquisitionTime optical signal offset distance +.>The signal analysis module is according to the offset distance +.>Calculating the optical signal path offset>。
，/>
Wherein the method comprises the steps ofIs->The optical signal is shifted by the shift distance of the center of the optical signal receiver 4 at the moment, and R is the receiving window radius of the optical signal receiver 4.
The signal analysis module is preset with a deformation threshold m and a path offset threshold n, wherein m is 1-10 mm, n is 0.5-5 mm, and the sampling time interval is 60-240 minutes.
When the deformation isLess than threshold m, or optical signal path offset +.>And when the threshold value n is smaller than the threshold value n, no early warning is performed.
When the deformation isGreater than or equal to threshold m, and optical signal path offset +.>And when the threshold value n is greater than or equal to the threshold value n, automatically giving out early warning.
It should be noted that, the automatic monitoring device for geological disasters further includes: the power supply module comprises an auxiliary power supply and a main power supply, wherein the main power supply is used for supplying power to the electric signal monitoring module, the optical signal monitoring module, the signal analysis module and the early warning device, the auxiliary power supply is used for supplying power to the wireless communication module and is connected with the remote terminal equipment through the wireless communication module, and the wireless communication module receives the instruction of the remote terminal equipment to control the main power supply to work or sleep.
The early warning device comprises a display screen and an audible and visual reminding unit, wherein the display screen is used for displaying warning characters, and the audible and visual reminding unit is used for emitting light signals and/or warning beeps.
In addition, the remote terminal equipment can also receive the early warning information transmitted by the device in real time, and if necessary, the remote terminal equipment can send the early warning information to residents around the target monitoring area through mobile phones to remind the residents of paying attention so as to achieve the purpose of reducing casualties.
Example 2
The embodiment discloses an automatic monitoring method for geological disasters, which is used for monitoring and early warning of landslide areas, as shown in fig. 3, and comprises the following steps:
step S1, at least 3 groups of coaxial cables and optical signal equipment are arranged in a target monitoring area, the coaxial cables are vertically buried through a fixed rod and penetrate through a sliding belt, and the optical signal equipment is arranged at the upper end of the fixed rod.
The coaxial cable is fixed through the dead lever, the dead lever is the metal pipe, coaxial cable passes through the bandage and restrains in the pipe outside. The burial depth of the coaxial cable is at least 3 meters above the bottom of the deepest sliding belt, the length of the coaxial cable is not less than 5 meters, and the ground leakage part of the fixing rod is not more than 1.5 meters. The upper end of the fixed rod is connected with optical signal equipment, the optical signal generating source, the optical signal receiver and at least 1 transmission prism are respectively connected with different fixed rods to form an optical signal transmission monitoring path.
And S2, measuring the reflected voltage amplitude of the coaxial cable and the current signal intensity received by the optical signal equipment, and calculating the deformation of the coaxial cable and the offset of the light-emitting signal path.
Coaxial cableReflected voltage amplitude +.>According to the reflected voltage amplitude->Calculating the deformation of the coaxial cable>。
Wherein, the liquid crystal display device comprises a liquid crystal display device,z is the characteristic impedance of the coaxial cable when propagating along the forward direction and not deforming by extrusion,is the decay constant of the pulse signal, < >>Is the phase constant of the pulse signal, +.>For the reflected voltage amplitude at the initial time, L is the length of the coaxial cable,the voltage reflection coefficient at the deformation point, k, is a constant, and 0.257 is taken.
Optical signal receiver acquisitionTime optical signal offset by an offset distance of the optical signal receiver center>According to the offset distance->Calculating the optical signal path offset>。
，/>
Wherein the method comprises the steps ofIs->The optical signal at the moment is offset by the offset distance of the center of the optical signal receiver, and R is the optical signal receivingThe receiver receives a window radius.
And step S3, comparing the deformation of the coaxial cable and the deviation of the light-emitting signal path with a preset threshold value, and judging whether to send out early warning.
The preset threshold value comprises the following steps: a deformation threshold m and a path offset threshold n, wherein m is 1-10 mm, n is 0.5-5 mm, and the sampling time interval is 60-240 minutes. When the deformation isLess than threshold m, or optical signal path offset +.>And when the threshold value n is smaller than the threshold value n, no early warning is performed. When the deformation is->Greater than or equal to threshold m, and optical signal path offset +.>And when the threshold value n is greater than or equal to the threshold value n, automatically giving out early warning.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. An automatic geological disaster monitoring device for monitoring and early warning of landslide areas, characterized in that the device comprises: the system comprises an electric signal monitoring module, an optical signal monitoring module, a signal analysis module, a wireless communication module, an early warning device and remote terminal equipment;
the electric signal monitoring module comprises at least 3 groups of coaxial cables which are vertically buried in a soil layer of a target monitoring area, the coaxial cables are connected with the TDR measuring instrument, and reflected signals of pulse signals emitted by a signal source in the coaxial cables are received;
the optical signal monitoring module comprises optical signal equipment erected above a target monitoring area, wherein the optical signal equipment comprises an optical signal generating source, an optical signal receiver and at least 1 transmission prism;
the optical signal equipment is arranged right above the coaxial cable, and the TDR measuring instrument and the optical signal receiver are respectively connected with the signal analysis module;
the signal analysis module generates a signal analysis result according to the received signal data and a preset operation model, and transmits the signal data and the signal analysis result to the remote terminal equipment through the wireless communication module;
the signal analysis module is also connected with an early warning device, the early warning device is arranged around the target monitoring area, the signal analysis module is preset with a deformation threshold value and a path offset threshold value, and when the signal analysis result exceeds the threshold value, the early warning device automatically generates early warning information;
the signal analysis module monitors and analyzes based on the data acquired by the TDR measuring instrument and the optical signal receiver;
coaxial cable is measured to TDR measuring apparatuReflected voltage amplitude +.>The signal analysis module is used for analyzing the reflected voltage according to the reflected voltage amplitude +.>Calculating the deformation of the coaxial cable>；
；
Wherein z is the characteristic impedance of the coaxial cable in the forward direction without extrusion deformation,is the decay constant of the pulse signal, < >>Is the phase constant of the pulse signal, +.>For the initial reflected voltage amplitude, L is the length of the coaxial cable, < >>The voltage reflection coefficient at the deformation position is 0.257, wherein k is a constant;
the optical signal receiver collectsTime optical signal offset by an offset distance of the optical signal receiver center>The signal analysis module is according to the offset distance +.>Calculating the optical signal path offset>；
，/>；
Wherein the method comprises the steps ofIs->Shifting the optical signal at the moment by the shifting distance of the center of the optical signal receiver, wherein R is the radius of a receiving window of the optical signal receiver; />Initial current signal intensity generated for photoelectric conversion, +.>The current signal intensity at the time t;
the signal analysis module is pre-provided with a deformation threshold m and a path offset threshold n, wherein m is 1-10 mm, n is 0.5-5 mm, and the sampling time interval is 60-240 minutes;
when the deformation isLess than threshold m, or optical signal path offset +.>When the threshold value is smaller than the threshold value n, early warning is not carried out;
when the deformation isGreater than or equal to threshold m, and optical signal path offset +.>And when the threshold value n is greater than or equal to the threshold value n, automatically giving out early warning.
2. The automatic geological disaster monitoring device according to claim 1, wherein the coaxial cable is fixed by a fixing rod, the fixing rod is a metal round tube, and the coaxial cable is bound on the outer side of the round tube by a binding belt; the burial depth of the coaxial cable is at least 3 meters above the bottom of the deepest sliding belt, the length of the coaxial cable is not less than 5 meters, and the ground leakage part of the fixing rod is not more than 1.5 meters.
3. The automatic geological disaster monitoring device of claim 2, wherein the upper end of the fixing rod is connected with an optical signal device, an optical signal generating source, an optical signal receiver, and at least 1 transmission prism are respectively connected with different fixing rods to form an optical signal transmission monitoring path;
the optical signal generating source emits a laser beam in a signal acquisition period, the laser beam is captured by the optical signal receiver after being refracted by the transmission prism, and the optical signal receiver;
adjusting the optical signal device so that the laser beam emitted by the optical signal generating source is captured by the center of the receiving window of the optical signal receiver, and generating initial current signal intensity by photoelectric conversionAccording to the current signal intensity at time t +.>And the initial current signal strength +.>And calculating the optical signal path offset at the time t.
4. A geological disaster automatic monitoring device according to any of claims 1-3, characterized in that said device further comprises: the power supply module comprises an auxiliary power supply and a main power supply, wherein the main power supply is used for supplying power to the electric signal monitoring module, the optical signal monitoring module, the signal analysis module and the early warning device, the auxiliary power supply is used for supplying power to the wireless communication module, and is connected with the remote terminal equipment through the wireless communication module, and the wireless communication module receives the instruction of the remote terminal equipment to control the main power supply to work or sleep.
5. The automatic geological disaster monitoring device according to claim 4, wherein the early warning device comprises a display screen and an audible and visual reminding unit, wherein the display screen is used for displaying warning characters, and the audible and visual reminding unit is used for emitting light signals and/or alarm beeps.
6. An automatic geological disaster monitoring method for monitoring and early warning landslide areas, comprising the following steps:
step S1, at least 3 groups of coaxial cables and optical signal equipment are arranged in a target monitoring area, the coaxial cables are vertically buried through a fixed rod and penetrate through a sliding belt, and the optical signal equipment is arranged at the upper end of the fixed rod;
s2, measuring the reflected voltage amplitude of the coaxial cable and the current signal intensity received by the optical signal equipment, and calculating the deformation of the coaxial cable and the offset of an optical signal path;
step S3, comparing the deformation of the coaxial cable and the offset of the light-emitting signal path with a preset threshold value, and judging whether to send out early warning;
in step S2, the coaxial cableReflected voltage amplitude +.>According to the reflected voltage amplitude->Calculating the deformation of the coaxial cable>；
；
Wherein z is the characteristic impedance of the coaxial cable in the forward direction without extrusion deformation,is the decay constant of the pulse signal, < >>Is the phase constant of the pulse signal, +.>For the initial reflected voltage amplitude, L is the length of the coaxial cable, < >>The voltage reflection coefficient at the deformation position is 0.257, wherein k is a constant;
optical signal receiver acquisitionTime optical signal offset by an offset distance of the optical signal receiver center>According to the offset distance->Calculating the optical signal path offset>；
，/>；
Wherein the method comprises the steps ofIs->-1 timeThe etching signal is offset by an offset distance of the center of the optical signal receiver, and R is the radius of a receiving window of the optical signal receiver; />Initial current signal intensity generated for photoelectric conversion, +.>The current signal strength at time t.
7. The automatic geological disaster monitoring method according to claim 6, wherein in the step S1, the coaxial cable is fixed by a fixing rod, the fixing rod is a metal round tube, and the coaxial cable is bound on the outer side of the round tube by a binding belt; the burial depth of the coaxial cable is at least 3 meters above the bottom of the deepest sliding belt, the length of the coaxial cable is not less than 5 meters, and the part of the fixed rod, which leaks out of the ground, is not more than 1.5 meters; the upper end of the fixed rod is connected with optical signal equipment, an optical signal generating source and an optical signal receiver, and at least 1 transmission prism is respectively connected with different fixed rods to form an optical signal transmission monitoring path.
8. The method according to claim 7, wherein in step S3, the preset threshold value includes: a deformation threshold m and a path offset threshold n, wherein m is 1-10 mm, n is 0.5-5 mm, and the sampling time interval is 60-240 minutes;
when the deformation isLess than threshold m, or optical signal path offset +.>When the threshold value is smaller than the threshold value n, early warning is not carried out;
when the deformation isGreater than equal toAt threshold m, and optical signal path offset +.>And when the threshold value n is greater than or equal to the threshold value n, automatically giving out early warning.
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| CN202311596230.4A CN117315892B (en) | 2023-11-28 | 2023-11-28 | Automatic geological disaster monitoring device and monitoring method |
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| CN202311596230.4A CN117315892B (en) | 2023-11-28 | 2023-11-28 | Automatic geological disaster monitoring device and monitoring method |
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| CN117315892B true CN117315892B (en) | 2024-02-13 |
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