CN118032112A - Optical fiber multi-parameter monitoring method for geological disasters of mine roof - Google Patents
Optical fiber multi-parameter monitoring method for geological disasters of mine roof Download PDFInfo
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- CN118032112A CN118032112A CN202410013998.2A CN202410013998A CN118032112A CN 118032112 A CN118032112 A CN 118032112A CN 202410013998 A CN202410013998 A CN 202410013998A CN 118032112 A CN118032112 A CN 118032112A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 55
- 239000013307 optical fiber Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 11
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 230000007935 neutral effect Effects 0.000 claims abstract description 5
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 239000003245 coal Substances 0.000 claims description 16
- 238000005553 drilling Methods 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 239000000725 suspension Substances 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02A90/30—Assessment of water resources
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Abstract
The invention discloses a multi-parameter optical fiber monitoring method for geological disasters of a mine roof, which comprises the steps of fixing a multi-parameter hole optical cable in a boss on the outer wall of a conveying pipe in a hole in parallel, moving the conveying pipe in the hole and the multi-parameter hole optical cable to the bottom of the hole through a through hole in an integral spiral drill rod under the drive of high-pressure water, withdrawing the drill rod, completing the layout of the multi-parameter hole optical cable by using a suspension anchor, injecting non-expansion neutral cement slurry to enable the multi-parameter hole optical cable to be fully coupled with a well wall, and carrying out remote joint monitoring on the mine roof strain and the acoustic vibration multi-parameter by using a ground integrated optical fiber monitoring host. The invention can realize the feeding and the arrangement of the optical cable in the multi-parameter hole at one time, can ensure the full coupling of the optical cable in the multi-parameter hole and the well wall, completes the dynamic monitoring of the geological disaster hidden danger factors, and realizes the dynamic intelligent identification and timely feedback of the geological disaster factors of the mine roof.
Description
Technical Field
The invention belongs to the technical field of coal mines, and relates to a fiber optic multi-parameter monitoring method for geological disasters of a mine roof.
Background
Along with the increase of the mining depth and the improvement of the mining intensity of the coal mine, a plurality of disaster problems are inevitably faced, however, in various coal mine disasters, roof disaster inducing factors are more, burst is easy, prevention and control are difficult, and the roof disaster inducing factors are still important factors for restricting the safe production of the coal mine. Whether large mines or medium-small coal enterprises exist, a certain degree of roof safety hidden danger exists, and effective prevention and control of roof disasters still remain a technical problem that the development of the coal industry in China needs to be deeply explored. Microseismic and strain monitoring is one of the effective means to solve the mine roof disaster problems described above. By arranging the observation sensing optical cable on the roof, the stress distribution, crack expansion and space expansion forms, coal rock layer activity rules, coal rock body rupture mechanisms and mine earthquake space-time evolution processes inside the roof of the coal rock body can be monitored, the roof geological disaster hidden danger multi-field dynamic analysis is completed, and the dynamic intelligent recognition and timely feedback of mine roof geological disaster factors can be further realized.
At present, the mine roof microseism and roof deformation are monitored by mostly arranging a traditional moving coil detector and a strain gauge in a roadway, the monitoring mode is far away from a monitoring event, the signal to noise ratio of the acquired signal is very low, electromagnetic interference exists in the analog signal acquisition process, the reliability of the monitoring data is poor, and the monitoring data is inevitably interfered by large-scale electromechanical equipment such as a belt conveyor and a coal mining machine, so that effective cracks and deformation events are difficult to obtain. The problems restrict the popularization and the application of monitoring equipment to a certain extent, and the dynamic intelligent identification and the timely feedback of the geological disaster of the mine roof are difficult to realize.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the optical fiber multi-parameter monitoring method for the geological disasters of the mine roof, which aims to solve the problems that the signal to noise ratio of the acquired signals is low, the reliability of the monitored data is poor, effective cracks and deformation events are difficult to obtain, dynamic intelligent identification and timely feedback of the geological disasters of the mine roof are difficult to realize, and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
the optical fiber multi-parameter monitoring method for the geological disaster of the mine roof comprises the following steps:
Step 1, after directional drilling is performed to the designed hole depth, all directional drilling tools in the drilled hole are put forward, and the integral hollow spiral drill rod is connected with a guiding openable drill bit and is put down to a position which is not less than 50cm away from the hole bottom; fixing the optical cable in the multi-parameter hole in parallel in a boss of the outer wall of the conveying pipe in the hole, and fixing the bottom end of the optical cable in the multi-parameter hole and the bottom end of the conveying pipe in the hole on the hanging anchor gripper together so that the hanging anchor gripper spring is in a contracted state and enters the through hole in the integral hollow spiral drill rod;
Step 2, arranging a one-way valve at the orifice end of a conveying pipe in a hole, connecting a high-pressure water pump, controlling water to be filled into the conveying pipe in the hole, driving the conveying pipe in the hole and an optical cable in a multi-parameter hole to move towards the bottom direction of the hole through a through hole in an integral spiral drill rod under the drive of the high-pressure water, hanging an anchor grab to push up a central beam of a guiding openable drill bit under the action of the high-pressure water, hanging the conveying pipe in the anchor grab to connect the hole and the optical cable in the multi-parameter hole to reach the bottom of the hole through the drill bit, lifting all the integral hollow spiral drill rods in the hole, embedding hanging anchor grab wings into a hole wall coal body, reversely fixing the coal body on the hole wall, and leaving the conveying pipe in the hole and the optical cable in the multi-parameter hole in the hole to finish the arrangement of the optical cable in the multi-parameter hole;
Step 3, injecting non-expansion neutral cement slurry into the annular gap between the outer wall of the conveying pipe in the hole and the inner wall of the drill hole by using a grouting pump at the hole opening, sealing the gap between the outer wall of the conveying pipe in the hole and the hole wall at the hole opening, ensuring that the optical cable in the multi-parameter hole is fully coupled with the well wall, and completing the coupling of the optical cable in the multi-parameter hole after the cement slurry in the hole is solidified after 24 hours;
And 4, connecting the optical cable in the multi-parameter hole with a transmission optical cable through a circulator at the hole opening, and connecting the optical cable with a ground integrated optical fiber monitoring host through an underground ring network to perform remote joint monitoring of the multi-parameter of the mine roof strain and the acoustic vibration.
The invention also comprises the following technical characteristics:
Specifically, the conveying pipe in the hole adopts a PVC pipe, and a boss on the outer wall of the conveying pipe in the hole is parallel to the conveying pipe in the hole.
Specifically, the optical cable in the multi-parameter hole comprises a 3-core single mode optical fiber, which is a strain sensing optical fiber, a vibration sensing optical fiber and a standby optical fiber respectively.
Specifically, the integrated optical fiber monitoring host comprises a vibration monitoring module and a strain monitoring module.
Specifically, the vibration monitoring module obtains a seismic wave displacement spectrum based on distributed optical fiber acoustic wave sensing record waveform data, and monitors obtained parameters: low frequency level Ω 0, corner frequency f c, quality factor Q; further, the source parameters, seismic moment M 0, moment amplitude M W, fracture radius r, stress drop Δσ, and radiant energy E s, were calculated as follows:
wherein ρ is density, v c is transverse wave or longitudinal wave speed, R is epicenter distance, and U is radiation characteristic factor;
Es＝4πρvcR2×2∫|Ω|2df (6)
Where k c is a constant, β is a transverse wave velocity, Ω (f) represents a low frequency amplitude of the displacement spectrum, f represents a frequency, and t represents time.
Specifically, the strain monitoring module monitors one-dimensional elastic strain epsilon x along the axial direction of the optical cable in the multi-parameter hole based on distributed optical fiber strain sensing; and further calculating a three-dimensional stress parameter sigma x、σy、σz as follows:
σx＝(λ+2μ)εx＝ELεx (7)
Where λ and μ are the Lame coefficients, G is the shear modulus, E L is the lateral elastic modulus, K is the bulk modulus, E is the one-dimensional stress elastic modulus, and v is the Poisson ratio.
Compared with the prior art, the invention has the following technical effects:
According to the invention, high-pressure water is flushed into the conveying pipe in the hole through the integral hollow spiral drill rod and the guiding openable drill bit, and the suspension anchor grab is utilized to realize the feeding and the arrangement of the optical cable in the multi-parameter hole at one time.
The invention performs gap grouting on the outer wall of the conveying pipe in the hole and the inner wall of the drill hole, and can ensure that the optical cable in the multi-parameter hole is fully coupled with the well wall under the condition of not damaging the drilling condition and not sealing the hole.
The invention solves the problems that a sensor cannot be arranged in a bare hole and the optical fiber monitoring host has no intrinsic safety certification by adopting a mode of processing and displaying optical fiber monitoring hosts integrated with the ground by optical cables in the multi-parameter holes.
According to the invention, through multi-parameter combined processing such as strain, vibration and the like, dynamic monitoring of factors of geological disasters and hidden danger can be completed, and dynamic intelligent identification and timely feedback of geological disaster factors of a mine roof are realized.
Drawings
FIG. 1 is a schematic diagram of a multi-parameter in-hole cable feed;
FIG. 2 is a schematic cross-sectional view of a delivery tube in a bore;
FIG. 3 is a graph showing the result of identifying the degree of failure of the top plate of the cable strain monitoring module in a multi-parameter hole.
Reference numerals meaning: 1. the hole-in conveying pipe, the boss, the multi-parameter hole-in optical cable, the hanging anchor gripper, the integral hollow spiral drill rod, the guiding openable drill bit center cross beam and the hole wall.
Detailed Description
The following specific embodiments of the present application are provided, and it should be noted that the present application is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of the present application fall within the protection scope of the present application.
Example 1:
As shown in fig. 1 to 3, the embodiment provides a method for monitoring geological disasters of a mine roof by using optical fibers, which is characterized in that an observation sensing optical cable is laid through long drilling holes of the roof, an observation optical cable laying coupling process is formed by using conveying pipes in the holes, and the combined interpretation of microseism and strain high density can be realized by using a multi-parameter optical fiber data processing technology, so that dynamic analysis of geological disasters of the mine roof is realized.
The method specifically comprises the following steps:
Step 1, after directional drilling is performed to the designed hole depth, all directional drilling tools in the drilled hole are put forward, and the integral hollow spiral drill rod is connected with a guiding openable drill bit and is put down to a position which is not less than 50cm away from the hole bottom; fixing the optical cable in the multi-parameter hole in parallel in a boss of the outer wall of the conveying pipe in the hole, and fixing the bottom end of the optical cable in the multi-parameter hole and the bottom end of the conveying pipe in the hole on the hanging anchor gripper together so that the hanging anchor gripper spring is in a contracted state and enters the through hole in the integral hollow spiral drill rod; in the embodiment, the conveying pipe in the hole adopts a PVC pipe, and the boss on the outer wall of the conveying pipe in the hole is parallel to the conveying pipe in the hole; specifically, as shown in the cross-section structure of the conveying pipe in the hole in FIG. 2, the conveying pipe in the hole adopts a PVC pipe with excellent performance, has high compressive strength, is easy to bend and not to fold, and ensures that the conveying pipe can smoothly pass through the hollow spiral drill rod and the inside of the drill bit according to the specification customization of the integral spiral drill rod. The outer wall of the conveying pipe in the hole is provided with bosses in parallel along the axial direction, and the optical cable in the multi-parameter hole is fixed in the bosses of the conveying pipe in the hole. The optical cable in the multi-parameter hole comprises a 3-core single mode optical fiber, which is a strain sensing optical fiber, a vibration sensing optical fiber and a standby optical fiber respectively.
Step 2, arranging a one-way valve at the orifice end of the conveying pipe in the hole, connecting a high-pressure water pump, controlling water to press the inside of the conveying pipe in the hole to fill high-pressure water, and enabling the high-pressure water to flow in from an inlet of the one-way valve and act on a cone valve, pushing up a valve core after overcoming the acting force of a spring and flowing out from an outlet of the one-way valve, wherein when water flow in the conveying pipe in the hole reversely flows in from the outlet end of the one-way valve, the valve core is pressed on a valve seat together with the spring force by the water pressure, and the water flow cannot reversely pass through, so that the water pressure in the conveying pipe in the hole cannot leak, and enough power is provided for conveying the conveying pipe in the hole and an optical cable in a multi-parameter hole to the bottom of the hole; under the drive of high-pressure water, the conveying pipe in the hole and the optical cable in the multi-parameter hole are conveyed to the bottom direction of the hole through the through hole in the integral spiral drill rod, when the position of the guiding openable drill bit is reached, the central cross beam of the guiding openable drill bit is jacked up by the suspension anchor gripper under the action of high-pressure water, the conveying pipe in the suspension anchor gripper connecting hole and the optical cable in the multi-parameter hole reach the bottom of the hole through the drill bit, the fins on the suspension anchor gripper are opened, all the integral hollow spiral drill rods in the hole are put forward, the suspension anchor gripper fins are embedded into the coal body of the hole wall and are reversely fixed on the hole wall, and the conveying pipe in the hole and the optical cable in the multi-parameter hole are left in the hole to complete the arrangement of the optical cable in the multi-parameter hole;
Step 3, injecting non-expansion neutral cement slurry into the annular gap between the outer wall of the conveying pipe in the hole and the inner wall of the drill hole by using a grouting pump at the hole opening, sealing the gap between the outer wall of the conveying pipe in the hole and the hole wall at the hole opening, ensuring that the optical cable in the multi-parameter hole is fully coupled with the well wall, and completing the coupling of the optical cable in the multi-parameter hole after the cement slurry in the hole is solidified after 24 hours; in the embodiment, retarder is added in the non-expansion neutral cement slurry, so that the fluidity of the cement slurry is ensured, the cement slurry can flow to the bottom of the hole by controlling the injection speed and pressure of the injected cement slurry, the gap between the outer wall of the conveying pipe in the hole and the hole wall is sealed at the hole opening, and the optical cable in the multi-parameter hole is fully coupled with the well wall.
And 4, connecting the optical cable in the multi-parameter hole with a transmission optical cable through a circulator at the hole opening, and connecting the optical cable with a ground integrated optical fiber monitoring host through an underground ring network to perform remote joint monitoring of the multi-parameter of the mine roof strain and the acoustic vibration. The integrated optical fiber monitoring host comprises a vibration monitoring module and a strain monitoring module.
The vibration monitoring module processes data mainly based on a distributed optical fiber acoustic wave sensing technology DAS, a heterodyne modulation and demodulation technology is adopted to be combined with a Rayleigh backscattering principle, and microseism focus parameter inversion can be achieved through vibration sensing optical fiber data acquisition. The fracture of the roof strata induces microseismic events, generating seismic compressional and shear waves, which reveal the fracture surface expansion characteristics of the roof fracture. The vibration monitoring module obtains a seismic wave displacement spectrum based on distributed optical fiber acoustic wave sensing record waveform data, and parameters are obtained through monitoring: low frequency level Ω 0, corner frequency f c, quality factor Q; further, the seismic moment M 0, moment amplitude M W, fracture radius r, stress drop Δσ, and radiant energy E s were calculated as follows:
wherein ρ is density, v c is transverse wave or longitudinal wave speed, R is epicenter distance, and U is radiation characteristic factor;
Es＝4πρvcR2×2∫|Ω(f)|2df (6)
Wherein k c is a constant, beta is a transverse wave speed, Ω (f) represents a low-frequency amplitude of a displacement spectrum, f represents frequency, t represents time, the expansion characteristics of a fracture surface of a top plate crack can be estimated by combining a high-precision event positioning result and a discrete fracture grid analysis means through the seismic source parameters obtained through calculation.
The strain monitoring module processes data mainly based on a distributed optical fiber strain sensing technology BOTDR, and the dynamic strain data with high resolution and millisecond sampling can be obtained by acquiring the strain sensing optical fiber data by adopting a Brillouin scattering principle, and meanwhile, the spatial distribution state of strain parameters and the information of time change can be obtained. The strain monitoring module monitors one-dimensional elastic strain epsilon x along the axial direction of the optical cable in the multi-parameter hole based on distributed optical fiber strain sensing; and further calculating a three-dimensional stress parameter sigma x、σy、σz as follows:
σx＝(λ+2μ)εx＝ELεx (7)
Then, the side limiting stresses σ y and σ z can be expressed as:
Where λ and μ are the Lame coefficients, G is the shear modulus, E L is the lateral elastic modulus, K is the bulk modulus, E is the one-dimensional stress elastic modulus, and v is the Poisson ratio. Therefore, the three-dimensional stress parameter sigma x、σy、σz can be calculated according to the one-dimensional strain epsilon x observed by the distributed optical fiber strain sensing technology.
As shown in fig. 3, the left graph is a strain monitoring data waterfall graph, the right graph is a coalbed roof zoning result, and cracks and fractures appear when the roof is subjected to stress exceeding the tensile or compressive fracture strength of rock along with the advancing of a working surface in the mining process. Through the optical cable in the multi-parameter hole that lays in the long drilling of roof, can real-time supervision along the one-dimensional elastic strain of drilling direction to calculate this scope three-dimensional stress value, can analyze the deformation degree and the destruction scope of coal seam roof, thereby judge whether form crooked area, crack area or fall area.
The simple microseismic monitoring can reflect the dynamic spreading and cracking process of roof cracks and the change of the seismic velocity structure of the surrounding rock mass, but cannot monitor the deformation characteristics of the roof; the simple strain monitoring can reflect the deformation damage degree of the top plate, but cannot reflect the dynamic root of the excited deformation. By adopting the combined observation of sound waves and strain, the stress distribution in the top plate is analyzed from the strain monitoring signal, the source analysis of strain is carried out by inversion of the source parameter of the vibration monitoring signal, the mutual correspondence of the strain and microseism data is achieved, the cracking process of the top plate can be comprehensively identified, and the deformation and crack development degree of the top plate can be explained.
Claims (6)
1. The optical fiber multi-parameter monitoring method for the geological disasters of the mine roof is characterized by comprising the following steps of:
Step 1, after directional drilling is performed to the designed hole depth, all directional drilling tools in the drilled hole are put forward, and the integral hollow spiral drill rod is connected with a guiding openable drill bit and is put down to a position which is not less than 50cm away from the hole bottom; fixing the optical cable in the multi-parameter hole in parallel in a boss of the outer wall of the conveying pipe in the hole, and fixing the bottom end of the optical cable in the multi-parameter hole and the bottom end of the conveying pipe in the hole on the hanging anchor gripper together so that the hanging anchor gripper spring is in a contracted state and enters the through hole in the integral hollow spiral drill rod;
Step 2, arranging a one-way valve at the orifice end of a conveying pipe in a hole, connecting a high-pressure water pump, controlling water to be filled into the conveying pipe in the hole, driving the conveying pipe in the hole and an optical cable in a multi-parameter hole to move towards the bottom direction of the hole through a through hole in an integral spiral drill rod under the drive of the high-pressure water, hanging an anchor grab to push up a central beam of a guiding openable drill bit under the action of the high-pressure water, hanging the conveying pipe in the anchor grab to connect the hole and the optical cable in the multi-parameter hole to reach the bottom of the hole through the drill bit, lifting all the integral hollow spiral drill rods in the hole, embedding hanging anchor grab wings into a hole wall coal body, reversely fixing the coal body on the hole wall, and leaving the conveying pipe in the hole and the optical cable in the multi-parameter hole in the hole to finish the arrangement of the optical cable in the multi-parameter hole;
Step 3, injecting non-expansion neutral cement slurry into the annular gap between the outer wall of the conveying pipe in the hole and the inner wall of the drill hole by using a grouting pump at the hole opening, sealing the gap between the outer wall of the conveying pipe in the hole and the hole wall at the hole opening, ensuring that the optical cable in the multi-parameter hole is fully coupled with the well wall, and completing the coupling of the optical cable in the multi-parameter hole after the cement slurry in the hole is solidified after 24 hours;
And 4, connecting the optical cable in the multi-parameter hole with a transmission optical cable through a circulator at the hole opening, and connecting the optical cable with a ground integrated optical fiber monitoring host through an underground ring network to perform remote joint monitoring of the multi-parameter of the mine roof strain and the acoustic vibration.
2. The mine roof geological disaster optical fiber multi-parameter monitoring method of claim 1, wherein the conveying pipe in the hole adopts a PVC pipe, and a boss on the outer wall of the conveying pipe in the hole is arranged parallel to the conveying pipe in the hole.
3. The mine roof geologic hazard optical fiber multiparameter monitoring method of claim 1, wherein the multiparameter in-hole optical fiber comprises a 3-core single mode optical fiber, which is a strain sensing optical fiber, a vibration sensing optical fiber, and a spare optical fiber, respectively.
4. The mine roof geologic hazard optical fiber multiparameter monitoring method of claim 1, wherein the integrated optical fiber monitoring host comprises a vibration monitoring module and a strain monitoring module.
5. The method for monitoring the geological disaster of the mine roof by using the optical fibers according to claim 4, wherein the vibration monitoring module obtains a seismic wave displacement spectrum based on waveform data recorded by distributed optical fiber acoustic wave sensing, and monitors the obtained parameters: low frequency level Ω 0, corner frequency f c, quality factor Q; further, the source parameters, seismic moment M 0, moment amplitude M W, fracture radius r, stress drop Δσ, and radiant energy E s, were calculated as follows:
wherein ρ is density, v c is transverse wave or longitudinal wave speed, R is epicenter distance, and U is radiation characteristic factor;
Es＝4πρvcR2×2∫|Ω|2df (6)
Where k c is a constant, β is a transverse wave velocity, Ω (f) represents a low frequency amplitude of the displacement spectrum, f represents a frequency, and t represents time.
6. The mine roof geologic hazard optical fiber multiparameter monitoring method of claim 4, wherein the strain monitoring module monitors one-dimensional elastic strain epsilon x along the axial direction of the optical fiber cable in the multiparameter aperture based on distributed optical fiber strain sensing; and further calculating a three-dimensional stress parameter sigma x、σy、σz as follows:
σx＝(λ+2μ)εx＝ELεx (7)
Where λ and μ are the Lame coefficients, G is the shear modulus, E L is the lateral elastic modulus, K is the bulk modulus, E is the one-dimensional stress elastic modulus, and v is the Poisson ratio.
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