Utilization of Ground-Penetrating Radar to Determine Roof Competency in Underground Limestone Mines

Ross, Tim
Organization: International Conference on Ground Control in Mining
Pages: 4
Publication Date: Jan 1, 2002
J. M. Huber Corporation's Quincey Mine. an underground limestone mine located near Quincy. Illinois, has operated successfully and safely for many years utilizing roof bolts on a very limited basis. Over the years, the mine had experienced several rool falls that did not result in injury to personnel. Nearly all of the roof falls were limited to the first 2 feet of the massive limestone roof. Investigation of the falls indicated the major contributing factor to these roof falls was a randomly occuring thin. horizontal clay layer in the immediate roof. Over time, separation would occur at the clay layer. causing the root to sag. and eventually causing the root to fail. J. M. Huber Corporation contracted with NSA Engineering. Inc. to assist in a study to determine the effectiveness of Ground Penetrating Radar (GPR ) for locating these potential root fall areas so that mitigating action could he taken prior to roof failure. Multiple tests were conducted in areas of known roof conditions. GPR accurately predicted the existence or absence of root separation up to 1.5 meters into the immediate roof for 100 % of the known lest site conditions. As a consequence of this successful studs, J. M. Huber Corporation has used GPR to evaluate roof conditions at both its Quince and Marble Hill Mines.
Full Article Download:
(1145 kb)


Additional chapters/articles from the SME-ICGCM book Proceedings 21st International Conference on Ground Control in Mining

Pre-Driven Experimental Longwall Recovery Room Under Weak Ro
Longwall Mining-Induced Abutment Loads and Their Impacts on
Influence of Structural Stress Concentration and Structural
The NIOSH Shield Hydraulics Inspection and Evaluation of Leg
Study on Top-Coal Loss and the Optimum Drawing Interval of L
Stress Measurements for Safety Decisions in Longwall Coal
Re-Use of Rectangular Bolted Roadways in a Cover Depth > 100
Numerical Modeling of the Gob Loading Mechanism in Longwall
Deep Cover Pillar Extraction in the U.S. Coalfields
Evaluation of Pillar Recovery in Southern West Virginia
A Case History Investigation of Two Coal Bumps in the Southe
A Linear Coal Pillar Strength Formula for South African Coal
Anchorage Pull Testing for Fully Grouted Roof Bolts
Comparison of Some Aspects of Bolting Mechanisms Between Ful
Eclipse System Improves Resin Anchored Rebar Bolting
Design Considerations for Tensioned Bolts
Field Testing of the Fully Grouted Thrust Tensioned Bolts
Improvement in Pre-Tensioning of Strand Bolts in Australian
The Introduction of Roof Bolting to U.S. Underground Coal Mi
Support of Coal Mines in the United Kingdom
The Use of NDT Methods to Determine the Condition of Rockbol
Rockbolted Support of Retreat Longwall Gateroads at 1000m De
Roof Screening: Best Practices and Roof Bolting Machines
Numerical and Physical Modeling as Planning Tools for Rockbo
Stone Mine Design in Highly Fractured Rock
The Importance of Underground Stone Mine Roof Geology
Utilization of Ground-Penetrating Radar to Determine Roof Co
An Examination of the Loyalhanna Limestone's Structural
Highwall Stability in an Open Pit Stone Operation
Overview of Safety Considerations with Highwall Mining Opera
Highwall Monitoring to Combat Rockfall Accidents at Opencast
Seepage and Reinforcement Behavior of Grouting Into Slaking-
Floor Heave in Shallow Room-and-Pillar Mining
Analysis of a Stability Problem in an Underground Coal Mine
Comparison of Acoustic Emission and Stress Measurement Resul
Acoustic Scanner Analysis of Borehole Breakout to Define the
Estimating Rock Strengths Using Drilling Parameters During R
New developments with the coal mine roof rating
Application of geotechnical and geophysical parameters to im
Development of a Risk Rating System for Use in Underground C
Empirical and analytical design of large openings at a propo
Shear Mechanism for Mining-Induced Fractures Applied to Rock
Evaluating Techniques for Monitoring Rock Falls and Slope St
Developments in Sealant Support Systems for Ground Control
Stability Control of Clusters of Deep Openings Around Shaft
The Use of Pneumatic Stowing in Germany Considering Subsiden
A 3-D Semi-Analytical Method for Subsidence Prediction and S
Theory and Technology of Mining Subsidence Control by Grouti
Surface Subsidence Due to the Combined Effects of Undergroun