An Evaluation Of Strata Behavior And Tailgate Support Performance At Eagle Nest Mine

Mucho, T. P.
Organization: International Conference on Ground Control in Mining
Pages: 4
Publication Date: Jan 1, 1996
Strata behavior and support performance were evaluated in a longwall tailgate test area at the Eagle Nest Mine near Van, WV. The mine operates in the Eagle coalbed which ranges in height from 4 to 6 ft (1.2 to 1.8 m) on the mine property. Rugged topography results in rapid changes in overburden which ranges from 200 to 1200 ft (61 to 366 m). The immediate roof at this mine transitions from sandstone to shale. In some areas the sandstone appears to be massive while in many locations it is highly laminated, fossilized, and interspersed with coal streaks. Horizontal stress levels appear to be sufficient to create instabilities in the roof in some locations, especially where the roof is thinly laminated. Traditionally, hardwood cribs have been used at the mine to provide secondary support for longwall tailgates; Strata Products' Hercules cribs are installed on 8 ft (2.4 m) centers staggered left and right in the tailgate entry. In a 250 ft (75 m) tailgate test area, however, cable bolts were installed in lieu of cribs. The bolts were 12 ft (3.6 m) long tensionable cables anchored with 5 ft (1.5 m) of resin. Four cables were installed across the entry and rows were spaced on 6 ft (1.8 m) centers. Primary roof support was maintained in the vicinity of the test area using 42 in (1.1 m), grade 60, No. 6 (19 mm diameter) resin bolts installed on 4 ft (1.2 m) centers through T-2 channels. The cable test area was located under a stream valley in an area of relatively shallow overburden. Strata instabilities consistently had been associated with the stream valley in both the Eagle and the overlying Powellton coalbeds. In an effort to further expose the cables to the most difficult stress conditions available at the time of the test, the specific site chosen was directly beneath a barrier pillar remaining in the upper Powellton mine (approximately 150 ft (45 m) of interburden separates the two coalbeds).
Full Article Download:
(1444 kb)

Additional chapters/articles from the SME-ICGCM book Proceedings 15th International Conference On Ground Control In Mining

Practical Aspects Of Mobile Roof Support Usage
Chemical Consolidation For Roadway Surrounding Rock - It&apo
FortracĀ® Geogrids For Mine Roof Control
Ground Pressure Control With Use Of Freezing Rocks On The Or
Effect Of Specimen Size On Compressive Strength Of Coal
The Uniaxial Compressive Strength Of Coal: Should It Be Used
Three-Seam Interaction: A Case Study
Computer Modeling Of Rock Mass Geomechanic State In Longwall
The Influence Of Massive Sandstones In The Main Roof On Long
New Laminated Displacement-Discontinuity Program: Fundamenta
Load Determination For Long Cable Bolt Support Using Compute
Subsidence Misconceptions And Myths
Interaction Subsidence In The Sydney Coalfield, Nova Scotia
Identification Of Factors Affecting Horizontal Displacement
Subsidence Control Over Abandoned Mines
Monitoring Subsidence Over Submarine Coal Mines In The Sydne
High Horizontal Stress Effects On Longwall Gate Entry Stabil
Analysis Of Entry Roof Failure And Falls At Springvale Colli
The Effect Of Gas Pressure On Coal Strength
Applications Of Probabilistic Analysis In Mine Ground Contro
Regularities Of Rock Pressure Manifestations In Longwalls In
Design Of Multi-Level Thick Seam Extractions Under Major Aqu
State-Of-The-Art Room-And-Pillar Retreat Mining In The Kitta
Highwall Control At Homestake's Open Cut Mine
Design And Hazard Assessment Of Mine Ore Passes
Geomechanical Support Of Adaptive Mining Technology
Direct Laboratory Tensile Testing Of Select Yielding Rock Bo
Managing A New Technology - An Update Of The UK Rockbolting
Innovative Secondary Support Technologies For Western Mines
Innovation In Control Of Geomechanical State Of Undermined R
Application Of Tomographic Imaging To Stability Assessment
Using Ground Penetrating Radar For Roof Hazard Detection In
Classification Of Large Seismic Events At The Lucky Friday M
Rating Coal Mine Roof Strength From Exploratory Drill Core
Rapid Assessment Of Gateroad Roof Stability By Simple Monito
Geomechanic Monitoring And Distributed Information Systems
Monitoring Roof Beam Lateral Displacement At The Waste Isola
Laboratory Pull Tests Of Resin-Grouted Cable Bolts
Optimizing Secondary Tailgate Support Selection
Performance Evaluation Of A Cable Bolted Yield-Abutment Gate
High Horizontal Movements In Longwall Gate Roads Controlled
Shear Behavior Of Cable Bolt Supports In Horizontal, Bedded
An Evaluation Of Strata Behavior And Tailgate Support Perfor
Two Case Studies Of The Performance Of Rib Supports
Harworth Colliery: Rockbolted Support In Weak Roof At Depth
Problems And Prospects Of Roof Bolting Development At Cuzbas
Design Methods To Control Violent Pillar Failures In Room-An
Design Of Longwall Extractions Under Flooded Abandoned Worki
Effect Of Water On Stability Of Mine Roadways
Weightings And Water Inflows During Longwall Working
Underground Movement Of Rock Mass And Stress Distribution Du
Applications Of New Technologies To The Technical Design And
In-Seam Seismic Tomography Mapping Application To Coal Minin
Application Of Seismic Tomography In Underground Mining
Seismic Tomography For Longwall Stress Analysis
Geostatistical Methods For Hazard Assessment And Site Charac
Estimation Of Long-Term Stability Of Mine Pillars In Undergr
Geotechnical Factors Influencing A Time-Dependent Deformatio
Application Of Computer Programs For Rock Pressure Control
Analysis Of Multiple-Seam Interaction In A Bump-Prone Wester
Optimised Layout And Roadway Support Planning With Integrate
Automated Monitoring Of Rock Slopes And Waste Dumps
The Investigation Of The Rock Mass Stressed-Deformed State U