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|A method to assist in the evaluation and selection of roof bolts using in situ measurements of roof bolt loading has been developed by researchers of the Spokane Research Center, National Institute of Occupational Safety and Health. Both axial and bending forces are measured by strain gauges at many locations along the length of fully grouted bolts during various stages of mining. This information is then used to ( I) predict bolt loading for variations in bolt spacing, grade, and diameter, (2) calculate the design changes necessary in zones where bending loads are high, and (3) determine if bolt length is adequate. Results from several case studies of full-column bolt loading in coal mine gate roads are used to illustrate the design method. This knowledge will give design engineers a tool for the selection of roof support systems that will improve underground safety by reducing roof bolt failures.|
Additional chapters/articles from the SME-ICGCM book 16th International Conference on Ground Control in Mining (ICGCM)
|Longwall Mining-Through the Backfilled In-Panel Entries at C||Performance of Various Standing and Cribless Tailgate Suppor||Measurement of Effects of Interaction and Influence on Mine||Effects of Longwall Mining on Streamflow in the Pittsburgh S||Longwall Surface Subsidence Prediction Through Numerical Mod||Long-term Subsidence Over Longwall Chain Pillar Systems and||Subsidence Prediction Influence Assessment and Damage Contro||Formation of Face Headings Using Stress Relief at Asfordby M||Significant Weighting Events on the Longwalls in the Phalen||Full-face Pressure Monitoring in Medium-Weak Roof Condition||Research on the Interaction Between Roof Strata and Shield S||Roof Instability of Longwall Face at Ikeshima Colliery||Gob Canopy Roof Support for Difficult Natural Conditions||Yielding Cement Roof Supports for Longwall Mining||Management of the Dynamic Phenomena of Rock Pressure in Unde||Continuing Development of Innovative Cable Support Systems||Extending the Limits of Strata Bolting by the Use of Flexibl||Implementation and Evaluation of Roof Bolting in MICARE Mine||New Methods and Technologies of Roofbolting in Australia Coa||New Design Criteria for Roof Bolt Systems||Control Mechanism of a Tensioned Bolt System in the Laminate||A Study of the Performance of Glass Fibre Rock Reinforcement||A Method for the Selection of Rock Support Based on Bolt Loa||Strategies for the Application of Rockbolting Technology to||A Troubleshooting Guide for Roof Support Systems||A Statistical Overview of Retreat Mining of Coal Pillars in||Full-Scale Performance Evaluation of Mobile Roof Supports||Effect of the Interchamber Pi Yield on the Surface Strains i||Salt Pillar Design Equation||Case Study of Conditions Observed During the Removal of a Hi||Case Study of the Effect of Stratigraphic Location on Roof S||Ground Control and the Inundation of the Retsof Mine||Weatherability Test of Rocks for Underground Mines||Shear Strength Characteristics of Soft Rock Joints Based on||Comparison of Pillar Strengths Calculated Using Empirical Eq||Effects of In-seam and Near-seam Conditions and Asymmetric P||Ground Control Worker Safety During Extended Cut Mining||Analysis of Extensometer Data from a Room Widening Experimen||Airbag Support for Ground Control in Thin Seam Coal Mining||Development of a Statistical-Analytical Approach for Assessi||Ground Control Criteria for Coal Reserve Optimization in Mul||Calcium Aluminate Kiders in Hard Rock and Coal Mining||Simplified Pre-and Post-Processing Technique for Performing|