Displacement, stress and seismicity in roadway roofs ...

This paper describes a new integrated roof monitoring system and the results from applying this system in an Australian underground coal mine. The system integrates displacement, stress and seismic monitoring. It has been applied to two roadways in an Australian underground coal mine …

Toxic Gas Sensors Replace Canaries and Mice in Mines | DigiKey

Toxic Gas Sensors Replace Canaries and Mice in Mines ... Laser sensors are able to create a 360° profile of a mine shaft, while displacement sensors measure conveyer belt sag and assist in logging the amount of ore that goes across the belt. ... in addition to harmful and explosive gases, particles that are a result of coal mining, ...

Monitoring Underground Mine Displacement Using ...

was performed using laser scanning in an underground coal mine, where the displacement was induced by removing material by hand from the ribs. Volume changes as small as 57 cm3, or slightly larger than a golf ball, and as large as 57,549 cm3, were detectable in this environment, despite the change in rib surface reflectance and mine geometry.

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 ... Liu et al. discussed the potential applications and future trends of fiber optic sensors in coal mine hazard detection and prevention.

Physical Simulation and Monitoring the Deformation and ...

The efficient production and transportation of coal mine cannot work without all kinds of roadway in the ground mining system. Once the deformation of roadways occurred, the normal production and transportation in mine will be seriously affected and personal casualties may even be caused.

CDC - Mining - Mine Shaft Conveyance Monitoring - NIOSH

This system consists of position and guide-displacement sensors, a maintenance-free battery power supply and a new sensor, which is mounted on the wire rope with a Crosby Clip, to measure hoist-rope tension. A radio data link transmits sensor output to the hoistroom.

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GUC Series Mine Safety Type Displacement Sensors

GUC series of mine safety type displacement sensor is a magnetostrictive principle of non-contact absolute position measurement of displacement sensors, suitable for a mixture of methane gas and coal dust explosion hazards of coal mine. Contactless …

Coal mining - Wikipedia

Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the 1880s, has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production. In the United Kingdom and South Africa, a coal mine and its structures are a colliery, a coal mine - a pit, and the ...

Deformation Monitoring of Waste-Rock-Backfilled Mining …

advance of the mining face, three monitoring lines were set up with an interval of 10 m between each line. Each monitoring line was then sub-divided into three zones with an interval of 25 m along the direction parallel to the working face. A set of displacement sensors for the gob roof and a set of stress

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

Application of Distributed Optical Fiber Sensing ...

Bragg grating (FBG) displacement sensors [6]. Kajzar et al. carried out coal pillar deformation and coal roof monitoring by applying 3D laser technology within underground road- ... Erich discussed collapse feature of coal mine roadways by employing seismic reflection investigation method [13].

CN106257278A - Monitoring system and method for tunnel ...

The invention relates to a monitoring system and method for a tunnel roof separation simulation experiment. The monitoring system comprises embedded conduits, wherein the embedded conduits include the embedded conduit I and the embedded conduit II, a separation monitoring base point I is installed at the top end of the embedded conduit I, the separation monitoring base point I is connected ...

A radar coal thickness sensor - IEEE Journals & Magazine

Abstract: A radar coal thickness sensor is being developed by the Bureau of Mines to measure both the dielectric constant and thickness of a coal seam as part of a sensor array supporting a computer-assisted coal mining machine. The noncontacting stepped-CW radar sensor measures the complex reflection of coefficient of the coal-shale interface to resolve the coal thickness to sub-wavelength ...

Dynamic monitoring research on displacement of rock mass ...

Arrangement on displacement dynamic monitoring of rock mass in coal seam floor For monitoring the change of displacement of rock mass in coal seam floor with the 1604 workface mining, the borehole was constructed in the location which the distance of mining position and boreholes was 110 m, and the seven displacement monitoring sensors were ...

Mining Application Sensors - Positek Ltd

Paired with our 25+ years' experience, we can customise any of the ATEX, IECEx or CSA approved sensors within our range, and dispatched it to you in as little as 1-2 working days. Mining Application Sensors. As the leading brand in displacement transducer, Positek …

An Integrated Real-Time Roof Monitoring System for ...

Mine to develop a real-time roof monitoring and roof fall warning system for underground coal mines. A preliminary system has been developed and successfully trialled twice in the gateroads at Ulan Mine during 2004 and 2005. The system integrates the displacement monitoring, stress monitoring and seismic monitoring in one package.

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 ...

Surface mining - Wikipedia

"Strip mining" is the practice of mining a seam of mineral, by first removing a long strip of overlying soil and rock (the overburden).It is most commonly used to mine coal and lignite (brown coal).Strip mining is only practical when the ore body to be excavated is relatively near the surface.

Seismic Monitoring Strategies for Deep Longwall Coal Mines

Seismic Monitoring Strategies for Deep Longwall Coal Mines Peter Swanson, M. Shawn Boltz, and Chambers . DEPARTMENT OF HEALTH AND HUMAN SERVICES . Centers for Disease Control and Prevention . National Institute for Occupational Safety and Health . Office of Mine Safety and Health Research . Pittsburgh, PA • Spokane, WA . October 2016

CN103835755A - Disaster monitoring method for coal mine ...

The invention relates to a disaster monitoring method for a coal mine tunnel roof. The method includes the steps that before monitoring, stability of tunnel surrounding rock is estimated, a surrounding rock risk type monitoring area is determined according to an estimation result of the stability of the surrounding rock, then a serious disaster area of the tunnel roof is determined, and ...