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|Abrupt tailgate roadway ground failures, described as floor bumps, sometimes occur in the tailgate entry outby the face during the high-speed extraction of coal from mechanized longwall panels. These floor bumps typically damage the tailgate entry support structures for a distance of from 12.2 to 24.4 m (40 to 80 ft) outby the face. The relative closure of the tailgate entry may be a key indicator of potential tailgate ground control problems. Regression analyses of tailgate entry convergence data conducted by the U.S. Bureau of Mines (USBM) indicate that entry closure may be characterized as an exponential function of the distance outby the longwall face. Assuming that the entry closure is caused by the abutment loads created by the excavation of the longwall panel, the resulting convergence equation can be integrated to locate the centroid of abutment loading. This information can be used to document zones of potential ground failure ahead of the operating face.|
Additional chapters/articles from the SME-ICGCM book Proceedings of 13th International Conference on Ground Control in Mining
|Cable Bolting - Potential Applications For Variable Strata C||Evaluation Of Support Performance In A Highly Stressed Mine||Operational Experience With FLEXIBOLT Systems In Australian||Roofbolting In The Cape Breton Development Corporation'||Some Factors Influencing Stability Of Longwall Gateroad||Design Of Roadway Support Using A Strain Softening Model||Automation Of A Progressive Failure Procedure For Analysis O||The Massive Collapse Of Coal Pillars - Case Histories From T||Time Dependent Strength Of Coal Strata For Long-Term Pillar||Yield Pillar Behavior At Jim Walter No. 7 Mine Stress And St||A Comparison Of Overburden Response Due To Longwall Mining||Longwall Ground Behavior Characteristics In The Illinois Coa||Cavability Study Of A Competent Roof - A Case Study||Roof Pressure Monitoring Using The Integrated Longwalt Autom||Longwall Production, Maintenance, And Roof Control System||The Design And Selection Of Powered Supports For Application||Tailgate Support Practice In U.S. Longwall Mines - A Survey||Influence Of Support Capacity And Geometry On Tailgate Suppo||Innovative Concept In Tailgate Entry Support: Elimination Of||Resin-Grouted Cables For Longwall Tailgate Support Stability||Tailgate Roadway Convergence: A Key Indicator Of Potential G||Assessment Of Wood And Alternative Materials For Supplementa||Experience With The Boundary Element Method Of Numerical Mod||The Fault At The End Of The Tunnel||Microseismic Monitoring In The Sydney Coalfield||Realistic Design Of Ground Control Based On Geotechnical Dat||Underground High Resolution Seismic Method As A Low Cost Alt||Pillarless Longwall Mining For Multiple Seams||Stable Entry Design In A Multi-Seam Environment||Evaluating Roof Control In Underground Coal Mines With The C||Hazard Mapping Combining Geostatistical Modeling Of Coal Min||Stereological Sampling And Analysis For Characterizing Disco||Determining Horizontal Stress Direction Using The Stress Map||Stability And Stress Evaluation In Mines Using In-Seam Seism||Hydrogeologic Effects Of Subsidence At A Longwall Mine In Th||Monitoring Railroad Response To Mining Subsidence And Assess||Study On The High-Pressure Grouting Of The Overburden For Su|