Deformation monitoring of cracked concrete structures based on distributed optical fiber sensing technology

Li, Zixiang; Hou, Gongyu; Wang, Kai-di; Hu, Jinxin

doi:10.1016/j.yofte.2020.102446

Cited by 8 publications

(2 citation statements)

References 21 publications

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“…After the slope toe on the right side of the overburden slips, the maximum tensile strain at the left and right ends of the main key stratum exceeds 600 με. When microcracks occur in geotechnical materials, the optical fiber tensile strain is generally 600-1200 με 51,52 . Therefore, microcracks may occur in the main key stratum.…”

Section: Deformation Characteristics Of Key Stratamentioning

confidence: 99%

Multi-method joint monitoring study on strata behavior in shallow seam mining under bedrock gully

Chai,

Ma,

Zhang

et al. 2023

Sci Rep

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The Baijigou Coal Mine in Helan mountain mining area is alpine gully landform, and the double key stratums are cut by the gully. A two-dimensional physical similarity model under this condition was established in the laboratory. The strain field, deformation field and pressure field of the model are jointly and accurately monitored by BOTDA, DIC and pressure sensors. The rock behavior in shallow coal seam mining under bedrock gullies are studied. In the mining stage under the gully, the deformation of overburden is intense because overburden is thin, and the surface is easy to form a depression basin. In the mining stage far away from the gully, the deformed rock mass lacks horizontal support in the process of deflecting to the lower goaf, and the movement rock is in a multilateral block. The multilateral block rock periodically deflects and rotates, resulting in the periodic deformation and break of the inferior key stratum. At the mining stage of away from the gully, nine times of roof weighting occurred. And there are large and small periodic weighting phenomenon with the average roof pressure concentration coefficient is 1.37. The distance between the peak point of advance abutment pressure and the coal wall is 6–18 cm, and the influence distance decreases with the advancing of the working face. The inferior key stratum has a significant impact on the weighting process and the weighting strength. In the mining stage under the mountaintop, large downward inclined tension crack is prone to produce in the slope on the side of the stope line, and the roof weighting is the most severe. In the mining stage close to the gully, the overburden falls in layers from bottom to top, and the overburden at the slope toe is prone to slip. At the mining stage under the mountaintop and close to the gully, five times of roof weighting occurred. And the roof weighting concentration coefficient is 1.46 on average. The distance between the peak point of advance abutment pressure and the coal wall is always kept at 6–16 cm, and the influence distance is 33–41 cm. The study can provide a reference for mining design and ensures safe and efficient mining in this condition.

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Section: Deformation Characteristics Of Key Stratamentioning

confidence: 99%

Multi-method joint monitoring study on strata behavior in shallow seam mining under bedrock gully

Chai,

Ma,

Zhang

et al. 2023

Sci Rep

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show abstract

“…Li et al proposed a distributed fiber-optic sensor based on the Brillouin effect that solves the problem of point-based sensors. (16) This sensor had the advantages of a small body, corrosion resistance, anti-electromagnetic interference, a wide transmission bandwidth, integrated networking of sensing and transmission, continuous monitoring, a low maintenance cost, affordability, rapid sensing, and high sensitivity. These advantages allow it to be used to check the safety of pipelines, power cables, bridges, and missile systems and to diagnose buildings for subsidence and cracks.…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg Grating Inclinometer-enabled IoT Sensing System with Low Power Consumption and Small Size

Cui¹,

Le²,

Dai³

2021

Sensors and Materials

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The application of fiber Bragg grating (FBG) sensors in the Internet of Things (IoT) has attracted wide attention for promising scenarios, such as remote monitoring of the subsidence of transformer substations, intelligent sensing of the power grid, and monitoring the safety of mines. However, disaster prewarning and forecasting in infrastructure construction require the key technology of remote sensing and monitoring. To resolve the current problems existing in monitoring the subsidence of substations built on a slope, an inclinometer based on FBG sensor technology is developed in this study. The FBG inclinometer sensor includes a rigid unit, a flexible sensing unit, and a connecting pin shaft. The flexible sensing unit is equipped with an FBG beam structure with uniform strength. The designed FBG is arranged symmetrically on the surface of the beam structure to eliminate the influence of temperature on measurement. In addition, a system that uses the FBG inclinometer sensor for remotely monitoring the subsidence of a transformer substation is designed. This system can display the subsidence of the substation on-site or at a remote terminal in real time. Indoor and field tests are carried out on the remote monitoring system. The test results show that the minimum resolution of the system is 0.1 mm and the maximum measurement error is less than 3%, which meet the requirements of on-site use.

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Application of machine learning to the Vs-based soil liquefaction potential assessment

et al. 2023

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Deformation monitoring of cracked concrete structures based on distributed optical fiber sensing technology

Cited by 8 publications

References 21 publications

Multi-method joint monitoring study on strata behavior in shallow seam mining under bedrock gully

Multi-method joint monitoring study on strata behavior in shallow seam mining under bedrock gully

Fiber Bragg Grating Inclinometer-enabled IoT Sensing System with Low Power Consumption and Small Size

Application of machine learning to the Vs-based soil liquefaction potential assessment

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