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|Between June of 1975 and November of 1978 Stateham and Radcliffe of the Denver Research Center of the Bureau of Mines in cooperation with officials of the Bear Coal Company of Somerset. Colorado Conducted extensive studies of the roof conditions in the Bear Mine. The purpose of the investigation was to determine the relationship if any between the length of time the roof was left unbolted and the subsequent stability of the roof. Using the comprehensive information available from Stateham and Radcliffe (1), (2), (3), (4) the author has proposed a design for a roof truss installation which might have been used in lieu of some of the bolting in the areas where bad roof was encountered. Historically roof truss installations like bolting patterns have been applied rather than designed. The purpose of the present paper is to demonstrate how with the information available, one might proceed through a semi-rational design. In spite of the very extensive documentation by Stateham and Radcliffe, it was still necessary to make some working assumptions. It is, therefore, not intended that the process here illustrated be used without modification in any other mine nor is there any criticism implied or otherwise, of the way in which Bear Coal Company conducted its operations. The author has never visited the mine in question. This paper is meant to be an encouragement award a more rational use of roof trusses in situations where it is economically and structurally reasonable to do so.|
Additional chapters/articles from the SME-ICGCM book Proceeding of the Fourth Conference on Ground Control in Mining (ICGCM)
|Truss Bolting On-Cycle in Jane Mine Lower Freeport Seam||Design Of A Roof Truss Bolting Plan For Bear Mine||Tension-Torque Relationship For Mechanical Anchored Roof Bol||A Novel System For Automatic Installation Of Cement Grouted||Load Transfer Mechanics In Fully-Grouted Roof Bolts||An Investigation Of Longwall Pillar Stress History||Impact Of Horizontal Load On Shield Supports||Interaction Between Roof And Support On Longwall Faces With||Roof Control With Polyurethane For Recovery Of Kitt Energy?s||First Caving And Its Effects--A Case Study||Staubbekampfung An Schildausbau In Bruchbaustreben (Combatin||Yield Pillar Applications--Impact On Strata Control And Coal||Constraint Is The Prime Variable In Pillar Strength||Massive Pillar Failure--Two Case Studies||Investigations Of Underground Coal Mine Bursts||Destressing Practice In Rockburst-Prone Ground||Statistical Characterization Of Coal-Mine Roof Failure: Sugg||Pillar Design - Continuous Miner Butt Section And Longwall D||Design Factors In Near-Seam Interaction||Remote Sensing For Roof Control And Mine Planning: An Overvi||Design, Construction And Performance Of A Single Pass Lining||Computer Modelling And In Situ Instrumentation Techniques: A||A Sonic Wave Attenuation Technique For Monitoring Of Stress||The Radio Imaging Method (RIM) -- A Means Of Detecting And I||Clay Veins: Their Physical Characteristics. Prediction, and||Evaluation of the Point Load Strength for Soft Rock Classifi||Ground Control Experiences in a High Horizontal Stress Field||Horizontal Stresses and Their Impact on Roof Stability at th||Ground Control Problem Associated with Longwall Mining of De||Geotechnical Aspects of Subsidence over Room and Pillar Mine||Proposed Criteria for Assessing Subsidence Damage to Surface||Surface Subsidence. in Longwall Mining--A Case Stud||An Integrated Approach to the Monitoring and Modeling of Gro|