Field Distributed Displacement Monitoring of the Coal ...

2020-10-10  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 ... sensor to monitor the changes of various physical measurands along the axial direction of the

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Design and experiments on a wide range fiber Bragg

2014-10-1  In this paper, a displacement sensor using optical fiber grating technology was designed, which could be used to prevent the problem of coal mine tunnel collapse by monitoring the coal mine tunnel roof displacement.

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Fibre optic sensors for mine hazard detection

bars as strain gauges and long gauge length displacement sensors were developed to monitor the rock displacement. The range of the fibre optic displacement sensor is 0- 200 mm, accuracy of 0.1% were achieved. 2.3. Fibre Optic Micro-Seismic Detection . A fiber optic accelerometer was developed for the detection of micro-seismic events in

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Coal mine Safety Features Dec 2007 Photonics Spectra

Intelligent optical fiber sensor systems may help reduce the number of mining disasters. Tongyu Liu, Shandong Micro-Sensor Photonics Ltd., and Eric Bergles and William Yang, BaySpec Inc. According to the latest official mining statistics, from 2003 to 2006, more than 20,000 people died from coal mining accidents in China.

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An improved method of three-dimensional displacement

2021-1-21  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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technical Monitoring underground coal mining-induced ...

2014-1-15  for detecting surface displacement caused by underground coal mining is mentioned. Post-mining subsidence:This example deals with subsidence in an abandoned coal mining area located in Gaeun, Korea, reported by Jung et al. [21]. From November 1992 to October 1998, 25 JERS-1 SAR interferometric pairs were used, and the crack level obtained by a

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Mining-Induced Displacement and Resettlement: Social ...

2012-9-16  The problem of compulsory resettlement is also a consequence of open pit coal mining in European countries like Germany and Poland. Although mining-induced displacement is a global phenomenon, problems experienced by the displacees in many parts of the world differ greatly.

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University of Wollongong Research Online

2020-7-2  2006 Coal Operators’ Conference The AusIMM Illawarra Branch 68 6 – 7 July 2006 . Seismic sensors . A total of 12 seismic sensors were installed in two locations. 11 of them were installed at the fourth cut-through (4 C/T) where the roof fracturing and damage during mining was monitored in detail. One sensor was installed at the

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Experimental study on distributed optical fiber sensing ...

2019-12-1  In order to facilitate coal seam mining, the rectangular galvanized square pipe (60 mm × 40 mm) is selected to replace the coal seam in the test design. One square pipe is pulled out at a time, it means that the model coal seam is excavated once.

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Investigation of Fault Displacement Evolution During ...

2019-11-23  A physical simulation model is constructed to study the characteristics of fault displacement evolution at Yima mining area, Henan Province, China. The geological condition at Yima mining area is complicated with high in situ stress, reverse faults and extremely thick conglomerate rock strata. In this study, the fault movement process during extraction of a coal seam is simulated and the ...

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Fibre optic sensors for mine hazard detection

bars as strain gauges and long gauge length displacement sensors were developed to monitor the rock displacement. The range of the fibre optic displacement sensor is 0- 200 mm, accuracy of 0.1% were achieved. 2.3. Fibre Optic Micro-Seismic Detection . A fiber optic accelerometer was developed for the detection of micro-seismic events in

Get Price

Design of coal mine roadway on-line monitoring system ...

In process of excavation and mining,the stress distribution of roadway surrounding rock is complex and changeable,therefore,real-time monitoring of roadway layer displacement and surrounding rock pressure is an important factor to guarantee roadway work normally. Design a kind of coal mine roadway on-line monitoring system based on FBG sensor network,which achieves 700 m downhole data ...

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Coal mine Safety Features Dec 2007 Photonics Spectra

Coal mine Safety. Intelligent optical fiber sensor systems may help reduce the number of mining disasters. Tongyu Liu, Shandong Micro-Sensor Photonics Ltd., and Eric Bergles and William Yang, BaySpec Inc. According to the latest official mining statistics, from 2003 to 2006, more than 20,000 people died from coal mining accidents in China.

Get Price

technical Monitoring underground coal mining-induced ...

2014-1-15  for detecting surface displacement caused by underground coal mining is mentioned. Post-mining subsidence:This example deals with subsidence in an abandoned coal mining area located in Gaeun, Korea, reported by Jung et al. [21]. From November 1992 to October 1998, 25 JERS-1 SAR interferometric pairs were used, and the crack level obtained by a

Get Price

Fiber Bragg Grating (FBG) Sensors Used in Coal Mines

2017-8-28  FBG strain sensors reflects the changes in the strain of the concrete wall. A group of micro-seismic data are illustrated in the aspect of energy, length of time of the signal, and frequency. The results show the FBG sensors can be used in coal mines for coal mines safety. 2. FBG stress sensor applied in the coal mine

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University of Wollongong Research Online

2020-10-13  2006 Coal Operators’ Conference The AusIMM Illawarra Branch 68 6 – 7 July 2006 . Seismic sensors . A total of 12 seismic sensors were installed in two locations. 11 of them were installed at the fourth cut-through (4 C/T) where the roof fracturing and damage during mining was monitored in detail. One sensor was installed at the

Get Price

An improved method of three-dimensional displacement

2021-1-21  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.

Get Price

Multi-sensor remote sensing analysis of coal fire induced ...

1. Introduction. The efficiency of a country's industries and production largely depends on the natural sources of energy. Coal mines are the lifeline for electricity generation, accounting for 38.4% of the world's total electricity production (Bódis et al., 2019, World Energy Outlook, 2018).However, contamination of air, water, and soil due to the coal mines result in severe health problems ...

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Application of Distributed Optical Fiber Sensing ...

2017-8-16  In recent 20 years, as the depletion of coal resources in shallow strata, coal mining operations have been moving to deeper strata [1]. Approximately 60% of the coal mining works are conducted with a mining depth of over 800m in China [2]. Mining works in deep strata are facing the chal-lenges ofhighground stresses andcomplexgeological condi ...

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Mining-Induced Displacement and Resettlement: Social ...

2012-9-16  The problem of compulsory resettlement is also a consequence of open pit coal mining in European countries like Germany and Poland. Although mining-induced displacement is a global phenomenon, problems experienced by the displacees in many parts of the world differ greatly.

Get Price

Fibre optic sensors for mine hazard detection

bars as strain gauges and long gauge length displacement sensors were developed to monitor the rock displacement. The range of the fibre optic displacement sensor is 0- 200 mm, accuracy of 0.1% were achieved. 2.3. Fibre Optic Micro-Seismic Detection . A fiber optic accelerometer was developed for the detection of micro-seismic events in

Get Price

Project > Statistical analysis of coal-silo vibrations

About this project. 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 ...

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Coal mine Safety Features Dec 2007 Photonics Spectra

Coal mine Safety. Intelligent optical fiber sensor systems may help reduce the number of mining disasters. Tongyu Liu, Shandong Micro-Sensor Photonics Ltd., and Eric Bergles and William Yang, BaySpec Inc. According to the latest official mining statistics, from 2003 to 2006, more than 20,000 people died from coal mining accidents in China.

Get Price

technical Monitoring underground coal mining-induced ...

2014-1-15  for detecting surface displacement caused by underground coal mining is mentioned. Post-mining subsidence:This example deals with subsidence in an abandoned coal mining area located in Gaeun, Korea, reported by Jung et al. [21]. From November 1992 to October 1998, 25 JERS-1 SAR interferometric pairs were used, and the crack level obtained by a

Get Price

Recent advances in remote coal mining machine sensing ...

sensor to estimate the coal depth by exploiting the radioactivity of host strata typically found with coal deposits. The natural gamma sensors can work well in specific situations but require up to 30 seconds to obtain a reliable depth measurement. Such a delay can impact severely on coal mining

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An improved method of three-dimensional displacement

2021-1-21  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.

Get Price

Analysis and Design of Real-time Monitoring System of

System through the micro controller to drive a stepper motor control the coal bunker hanging hammer in the downlink and uplink; sensor design using pull rope type displacement sensor, when the heavy hammer and bunker coal level contact is detected, micro controller measurement of coal.

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Underground Coal Mine Monitoring with Wireless

2015-1-13  Underground Coal Mine Monitoring with Wireless Sensor Networks MO LI and YUNHAO LIU Hong Kong University of Science and Technology Environment monitoring in coal mines is an important application of wireless sensor networks (WSNs) that has commercial potential. We discuss the design of a Structure-Aware Self-Adaptive WSN system, SASA.

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Design Of Underground Coal Mine Monitoring System

2019-7-1  mining operations is called Coal mine methane (CMM). In recent years, there have been many 83 International Journal of Engineering Research Technology (IJERT) Vol. 2 Issue 5, May - 2013 ISSN: 2278-0181 ijert.org IJERTIJERT

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Mining-Induced Displacement and Resettlement: Social ...

2012-9-16  The problem of compulsory resettlement is also a consequence of open pit coal mining in European countries like Germany and Poland. Although mining-induced displacement is a global phenomenon, problems experienced by the displacees in many parts of the world differ greatly.

Get Price