The Application Of Underground In-Seam Seismic Methods (UISS) To Map The Coal Seam Structure Across Longwall Panels

Rodriguez, Rene
Organization: International Conference on Ground Control in Mining
Pages: 12
Publication Date: Jan 1, 1995
The initial results of our investigations on the applicability of geophysical exploration methods to map coal seam inclusions were summarized in a paper submitted at the Thirteenth Conference on Ground Control in Mining in 1994. These investigations were continued under a variety of conditions at a number of underground coal mining operations. The results have been encouraging and have fostered a much more detailed understanding of the geophysical principles at work in underground mine mapping. This report summarizes a particularly interesting application, that is, the use of Underground In-Seam Seismic exploration methods to identify and to approximately delineate coal seam inclusions within longwall panels. The methodology relies on the excitation of seismic sources in the coal seam along one side of the panel and the recording of seismic waves by geophones secured to the coal rib on the opposite side. Head-Body waves (compressional and shear), direct and channel waves are generated in the process. While the head waves are critically refracted waves traveling at the coal floor and roof, direct and channel waves are transmitted through the coal body and are dispersive in character. Tomographic techniques applied to the velocity inversion of first arrivals permits a fast mapping of coal seam inclusions in the panel. The process incorporates path velocity and geostatistical intersect analysis. Full wave analysis of the dispersive channel waves, provides an independent and confirmatory information of the coal geometry, including the inclusions within. The inversion technique in this case is the modal analysis of the wave trains. The application of this method to three different problems was confirmed by subsequent mining of the predicted anomalies, proving the accuracy of the technique within limits of experimental error.
Full Article Download:
(2888 kb)


Additional chapters/articles from the SME-ICGCM book Proceedings of 14th International Conference on Ground Control in fining

Truss Systems For Longwall Tailgate Support - Update
Cable Support Systems For Longwall Gate Road Stability
Innovative Tailgate Support For Heavy Ground: 11 Left Longwa
Parameters Affecting Resin-Anchored Cable Bolt Performance:
Roof Support Performance In High Stress Conditions
Regional Horizontal Stress And Its Effect On Longwall Mining
Deformation Development Around Mine Roadways And Simulation
Monitoring Mobile Roof Supports
Analysis Of Retreat Mining Pillar Stability
Planning And Design For Barrier Pillar Recovery Three Case H
Influence Of Partings In A Coal Seam On Long Term Pillar Sta
A Cooperative Study Of Gate Entry Designs Welbeck Colliery (
Comparative Case Study Of Yielding And Critical Coal Pillar
Comparison Of Empirical, Analytical, And Numerical Methods O
Nonlinear Approach For Determining Design Criteria For Yield
In-Situ Coal Strength Determination - Case Studies
The Design And Application Of Propsetter? In Underground Coa
Renewed Interest In Prop Supports As A Replacement For Wood
Improved Intersection Design And Monitoring In The Sydney Co
Drivage System In Retreat Longwall Gateroad
Case Study Of Stability Investigations Related To Shallow Un
Analysis Of Rockbolt Performance At The Waste Isolation Pilo
Continuous Improvement In Cuttable Coal Rib Support In Austr
Floor Failure Induced By Lateral Stress Ahead Of Longwall Su
Towards A Method Of Determining Floor Quality In An Undergro
Chinese And North American High-Extraction Underground Coal
Integration Of CAD-Based Mine Planning And Subsidence Engine
Development Of A Subsidence Database And Determination Of Su
Statistical Regional Calibration Of Subsidence Prediction Mo
Subsidence Monitoring Results, Thick Seam Longwall Mining In
Application Of Mechanical And Groundwater-Flow Models To Pre
The Application Of Underground In-Seam Seismic Methods (UISS
Vertical Stress Redistribution Around A Retreating Longwall
Entry Stability Monitoring & Analysis For Longwall & Continu
A Case Study Of A Deformation Mechanism Around A Two-Entry G
Multiseam Mining On South African Collieries
Design And Planning Of Lower Seam Longwall Gateroads
Optimizing Pillar Design In A Multi-Seam Environment