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Mining Publication: An Analysis of Rock Failure Around a Deep Longwall Using Microseismics
Keywords: Longwall panels Seismic methods Weak rock
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: August 2001
Authors: KA Heasley, JL Ellenberger, PW Jeran
Conference Paper - August 2001
Download PDF Document (0.43 MB)
NIOSHTIC2 Number: 20021324
20th Intl Conf on Ground Control in Mining. Morgantown, WV: West Virginia University, 2001 Aug; :280-286
In this paper, a state-of-the-art, three-dimensional, full waveform, microseismic system was used to analyze the rock failure around a deep (> 750 m (2500 ft) of cover) bump-prone longwall panel. The microseismic system consisted of both underground and surface geophones coupled through radio telemetry and a fiber-optic network to produce pseudo real-time detection and location of seismic events surrounding the coal seam. This was the first microseismic installation of this scope at a U.S. coal mine, and the system was intended to help determine the exact strata mechanics associated with the redistribution of stress and the associated gob formation at one of the U.S.'s deepest longwall mines. Overall, 5,000 calibrated seismic events were recorded during the mining of one panel, including a Richter magnitude 4.2 event which occurred inside of the array. Analysis of these events provides a number of notable insights into the rock mass behavior. For instance, the longwall panel was widened during the retreat process, and the mining-induced seismicity shows a distinctly different behavior between the start of the panel, the mining of the narrow part of the panel and the mining of the wider part of the panel. Also, in itself, the acquisition of the ML 4.2 event was a major milestone in geomechanical and bump research. This is the first time that such an event has been recorded with this detail and accuracy at a bump-prone coal mine in the U.S. The analysis of this single event has set distinct new limits on the relationship between mining seismicity and coal bumps.
Image of publication An Analysis of Rock Failure Around a Deep Longwall Using MicroseismicsConference Paper - August 2001
Download PDF Document (0.43 MB)
NIOSHTIC2 Number: 20021324
20th Intl Conf on Ground Control in Mining. Morgantown, WV: West Virginia University, 2001 Aug; :280-286
See Also
Analysis and Prediction of Longwall Methane Emissions: A Case Study in the Pocahontas No. 3 Coalbed, VA
An Analysis of Flexural Strength and Crack Width for Fiber-Reinforced Shotcrete Used in Weak Rock Mines
Development of an Automated PC-Network-Based Seismic Monitoring System
Development of Multiple Regression Functions for Performance Prediction of Gob Gas Ventholes for Sealed and Active Longwall Mines
Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
Elastic and Shear Moduli of Coal Measure Rocks Derived from Basic Well Logs Using Fractal Statistics and Radial Basis Functions
Stochastic Modeling of Gob Gas Venthole Production Performances in Active and Completed Longwall Panels of Coal Mines
Technology News 465 - Method for Predicting Methane Emissions on Extended Longwall Faces
Time-Lapse Tomography of a Longwall Panel: A Comparison of Location Schemes
Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob Areas
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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