Multiplexed FBG Monitoring System for Forecasting Coalmine Water Inrush Disaster

Liu, B.; Li, S. C.; Wang, J.; Sui, Qingmei; Wang, Z. F.

doi:10.1155/2012/895723

Cited by 14 publications

(10 citation statements)

References 15 publications

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“…Another fiber-optic technology with a potential use for groundwater flow monitoring is fiber Bragg grating (FBG) sensors [21,22]. FBG sensors already have a broad application range in aerospace (load monitoring and shape sensing [23,24,25]), in civil engineering (structural health monitoring [26,27,28]), and in the oil and gas industry (temperature and pressure monitoring [29]).…”

Section: Introductionmentioning

confidence: 99%

Possibilities for Groundwater Flow Sensing with Fiber Bragg Grating Sensors

Drusová

Bakx

Wexler³

et al. 2019

Sensors

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An understanding of groundwater flow near drinking water extraction wells is crucial when it comes to avoiding well clogging and pollution. A promising new approach to groundwater flow monitoring is the deployment of a network of optical fibers with fiber Bragg grating (FBG) sensors. In preparation for a field experiment, a laboratory scale aquifer was constructed to investigate the feasibility of FBG sensors for this application. Multiparameter FBG sensors were able to detect changes in temperature, pressure, and fiber shape with sensitivities influenced by the packaging. The first results showed that, in a simulated environment with a flow velocity of 2.9 m/d, FBG strain effects were more pronounced than initially expected. FBG sensors of a pressure-induced strain implemented in a spatial array could form a multiplexed sensor for the groundwater flow direction and magnitude. Within the scope of this research, key technical specifications of FBG interrogators for groundwater flow sensing were also identified.

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Section: Introductionmentioning

confidence: 99%

Possibilities for Groundwater Flow Sensing with Fiber Bragg Grating Sensors

Drusová

Bakx

Wexler³

et al. 2019

Sensors

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“…In the loading process of fine sandstone, the influence of hydrostatic pressure is fully considered; that is, the hydrostatic pressure is equal in the three principal stress directions during the loading process, and it is assumed that the deformation caused by hydrostatic pressure is ε s ; then, the expression of stress and strain of fine sandstone is as follows in Equation (10):…”

Section: Stress and Strain Evolution Of Rock Mass Under Triaxial Stressmentioning

confidence: 99%

“…When the two mining exploitation methods are used in the same area, the co-occurring processes of underground mining and open-pit influence each other [8]. In one aspect, the synchronization of the two working conditions will significantly change the strata structure, stress status, and formation of the mining of space [9,10]. On the other hand, more attention should be paid to the goafs at the bottom of underground mines, because the crown pillars are thin and a failure of the goaf close to the bottom may trigger a landslide disaster in the upper slope [11,12].…”

Section: Introductionmentioning

confidence: 99%

Experiment Study on Mechanical Evolution Characteristics of Coal and Rock under Three-Dimensional Triaxial Stress

Tao

Zhang

et al. 2022

Applied Sciences

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The surrounding rock is in a complex stress environment and its mechanical behavior is also complex, especially after the excavation of the coal seam, the phenomenon of stress release of surrounding rock often occurs. The vertical stress and horizontal stress of the surrounding rock mass will have a series of complex changes. In underground engineering, rock mass is affected by dead weight pressure and tectonic stress. With coal mine production, the original stress of surrounding rock is demolished, and the destruction of surrounding rock is reflected in the loading and unloading failure of three-dimensional stress. Aiming at the phenomenon, this paper takes the Pingshuo East open-pit mine as the research background, and the experiments on physical and mechanical parameters of coal and rock mass was carried out, obtaining the coal and rock mechanics parameters, such as elastic modulus, Poisson’s ratio, internal friction angle, cohesive force, etc. The stress strain curve was created based on the conventional triaxial experiment of coal and rock under different confining pressure conditions. According to the characteristics of these curves, we obtain underground engineering rock mass unloading stress–strain variation characteristics. Through establishing a stress–strain equation based on confining pressure, we finally describe the mechanical failure characteristics of rock under triaxial stress.

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“…Exploiting the distributed monitoring advantage of fiber optic sensing technology in temperature sensing technology-based methods for distributed seepage monitoring is an effective way to address the seepage monitoring problem of rockfill dams. At present, seepage monitoring methods based on distributed fiber optic temperature sensing technology are attracting tremendous interest in this field (Su et al ., 2016; Su and Kang, 2013; Khan et al ., 2014; Coté et al ., 2007; Su et al ., 2017; Wang et al ., 2016; Xiao and Huang, 2013; Yan et al ., 2015; Briggs et al ., 2016; Liu et al ., 2012). The theoretical basis of such methods is the coupling effect between the seepage and temperature fields (Bai et al ., 2017).…”

Section: Introductionmentioning

confidence: 99%

Mobile-distributed seepage monitoring method based on fiber Bragg grating sensing technology

Jiang

Zheng

Xiong

2018

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Purpose The spatial resolution of seepage monitoring methods based on fiber Bragg grating (FBG) temperature sensing technology is limited by the distance between measurement points. Improving the spatial resolution for a given number of measurement points is a prerequisite for popularizing this technology in the seepage monitoring of rockfill dams. The purpose of this paper is to address this problem. Design/methodology/approach This paper proposes a mobile-distributed seepage monitoring method based on the FBG-hydrothermal cycling seepage monitoring system. In this method, the positions of the measurement points are changed by freely dragging the FBG sensing cluster within the inner tube of a dual-tube structure, consisting of an inner polytetrafluoroethylene tube and outer polyethylene of raised temperature resistance heating tube. Findings A seepage velocity calibration test was carried out using the improved monitoring system. The results showed that under a constant seepage velocity, the use of the dual-tube structure enables faster cooling, and the cooling rate accelerates with an increase in the diameter of the inner tube. The use of the dual-tube structure can improve the sensitivity of the seepage evaluation index ζv to the seepage velocity. When the inner diameter increases, ζv becomes more sensitive to the seepage velocity. Originality/value A mobile-distributed seepage monitoring method based on FBG sensing technology is proposed in which the FBG sensors are not fixed. Instead, the positions of the measurement points are changed to improve the spatial resolution. Meanwhile, the use of the dual-tube structure in the presented monitoring system can improve its sensitivity.

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Multiplexed FBG Monitoring System for Forecasting Coalmine Water Inrush Disaster

Cited by 14 publications

References 15 publications

Possibilities for Groundwater Flow Sensing with Fiber Bragg Grating Sensors

Possibilities for Groundwater Flow Sensing with Fiber Bragg Grating Sensors

Experiment Study on Mechanical Evolution Characteristics of Coal and Rock under Three-Dimensional Triaxial Stress

Mobile-distributed seepage monitoring method based on fiber Bragg grating sensing technology

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