• Seismic Monitoring Strategies for Deep Longwall Coal

    Seismic Monitoring Strategies for Deep Longwall Coal

    4. Implementation of a mine-wide or district-wide network 5. Installation of a dense microseismic network These strategies take into consideration: (1) the variety of potential objectives for seismic monitoring, (2) the notable contrast of coal mining environments with conditions in hardrock

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  • Monitoring of coal mine roadway roof separation based on

    Monitoring of coal mine roadway roof separation based on

    Zhao et al. [14] designed an FBG displacement sensor to eliminate the crosssensitivity of temperature and displacement of FBG and prevent coal mine tunnel collapse by monitoring the roof

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  • An improved method of three-dimensional

    An improved method of three-dimensional

    horizontal displacement Generally, the mining direction follows the strike direction, which is perpendicular to the inclined direction, to extract coal easily. Figure 1 illustrates the profile of a mining subsidence basin after the coal mine has been exploited in the strike direction. At this point, the coal seam can be regarded as horizontal

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  • Sensors | Free Full-Text | Measurements of Excavation

    Sensors | Free Full-Text | Measurements of Excavation

    In the excavation of the coal mine roadway, the mining operation accelerates the deformation of the roadway and even causes disasters such as collapse [1,2].According to the statistics, the number of casualties in coal mines due to roadway roof collapse in the past years accounts for 35–40% of the total number of all the accidents in coal mining

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  • Project > Statistical analysis of coal-silo vibrations

    Project > Statistical analysis of coal-silo vibrations

    2019. At its coal mine near Underwood, North Dakota, Falkirk Mining noticed unusual vibrations occurring in its silo during certain periods. Concerned about the silo’s structural stability, the company asked Barr to investigate the cause. Our structural engineers installed four vibration and displacement sensors at various heights on the silo

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  • Experimental study on distributed optical fiber sensing

    Experimental study on distributed optical fiber sensing

    Dec 01, 2019 The test engineering background is based on the mining geological conditions of Qianqiu Coal Mine of Yima Coal Industry Group in Henan Province. The mine production capacity is 2.1 million t/a, the main mining coal seam is No. 2 coal, the average thickness of the coal seam is about 24.0 m, the inclination angle of the coal seam is 3 ~11 , and

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  • A new method of monitoring the stability of boreholes for

    A new method of monitoring the stability of boreholes for

    Mar 15, 2020 1.Introduction. Coal is an indispensable energy source in human activities .More than 7 billion tons of coal is consumed in each year across the world in multiple industries , .Coal, as a mixture of many organic substances, has well developed pores and fractures .A large amount of methane-dominated methane is adsorbed by the surface of the solid matrix of the coal, and there is a large

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  • Ground Response and Mining-Induced Stress in

    Ground Response and Mining-Induced Stress in

    Panel of a Kilometer-Deep Coal Mine ... stalling stress sensors in the inclined borehole, Guo et al. found that the influence scope of the longwall mining reached 300m [11]. e vertical stress experienced a peak ... Figure 5, vertical displacement of the immediate roof is

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  • Pressure and temperature surveillance in coal mining and

    Pressure and temperature surveillance in coal mining and

    A safer a more reliable monitoring solution for coal mining and coal seam gas applications Surveillance of pressure, temperature and deformation without impairing safety. Coal seam fire is a major concern for coal mining activities and gas extraction method such as CBM and CSG

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  • Experimental Study on the Performance of Different Meshes

    Experimental Study on the Performance of Different Meshes

    Sep 29, 2021 Three sets of monitoring systems, namely displacement sensor, pressure sensor and boundary tension sensor, are arranged in the testing facility to monitor the displacement, load and lateral tension of the tested straps and meshes under vertical load, respectively. ... State Key Laboratory of Coal Mining and Clean Utilization, China Coal

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  • Sensors | Free Full-Text | Examples of the Use of the

    Sensors | Free Full-Text | Examples of the Use of the

    This paper presents the ARAMIS 3D system and examples of deformation susceptibility test results made on mixtures of coal mining waste and recycled tire rubber bound with the use of hydraulic binders. The ARAMIS 3D system is a measurement tool based on 3D scanning of the surface of the tested material. On the basis of the obtained 3D video image, the system allows for the continuous

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  • Field Distributed Displacement Monitoring of the Coal

    Field Distributed Displacement Monitoring of the Coal

    The roof displacement monitoring of coal mine roadways is the most common means to prevent the roof accident, and is the key to ensure the coal mine safety production. But the monitoring blind zones or leakage points caused by traditional monitoring methods are one of

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  • COAL MINE EXPERT SYSTEM FOR PREWARMING OF

    COAL MINE EXPERT SYSTEM FOR PREWARMING OF

    displacement sensor can monitor the location of roof abscission layer. Through the speed displacement changes we can master the roof movement dynamic process .With the help of expert system of the roof forecasting, the workers may get early warning. A great number of facts have proved that the monitoring

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  • A Fiber Bragg Grating-Based Monitoring System for Roof

    A Fiber Bragg Grating-Based Monitoring System for Roof

    Zhuji Coal Mine, China. Monitoring results from the study site have demonstrated the advantages of FBG-based sensors over traditional monitoring approaches. The dynamic impacts of progressive face advance on roof displacement and stress have been accurately captured by the novel roadway roof

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  • An Experimental and Analytical Research on the Evolution

    An Experimental and Analytical Research on the Evolution

    Jul 21, 2020 To effectively monitor the variations of stress and displacement in the floor rock mass in the process of coal seam mining, stress sensors and displacement monitoring spots were arranged at different depths of the rock from the coal seam floor in the test

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  • Application of Distributed Optical Fiber Sensing

    Application of Distributed Optical Fiber Sensing

    Aug 16, 2017 of coal mining and roadway excavation in underground coal mines. Zhao et al. conducted damage process monitoring of roadwaysurrounding rockbyusing microseismic techniques [5].Zhaoetal.proposedadisplacementmonitoringmethod-ology of overlying rock layers of coal seam based on fiber Bragg grating (FBG) displacement sensors [6]. Kajzar et al

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  • Geotechnical fiber optic monitoring solutions

    Geotechnical fiber optic monitoring solutions

    Safe and reliable monitoring solution for the coal mining activities is not an option. Results of coal seam fire could be catastrophic. Excessive gas concentration is also very problematic since it can leads to mine evacuation and losses of production. Existing electric based sensors could be the source of critical security issues. Read more

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  • Sensors | Free Full-Text | A Fiber Bragg Grating-Based

    Sensors | Free Full-Text | A Fiber Bragg Grating-Based

    Zhao et al. designed a displacement sensor using a fiber optic grating technology, which could be used to monitor tunnel roof displacement in coal mines. Zhou et al. [ 18 ] developed an active fiber optic gas sensor to monitor the concentration of a specific gas, which is ideal for detecting explosive or corrosive gases in some practical application scenarios

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