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|It is commonly accepted that the tension of roof bolts can be used as a measure of the effectiveness of roof support performance in coal bearing strata. The conceptual base for the assumption originates from beam theory. Roof bolt tension acting across the bedding and other weakness planes increases friction, preventing potential separation and slippage within the roof strata and therefore, increases the stiffness of the roof beam between the open face and the rock-mass enclosed within the anchorage. Thus, it is important to monitor roof bolt tension, especially for research purposes, and consequently many measuring systems were developed based on numerous working principles. Research planned by the Department of Mining Engineering at the University of Kentucky required a large number of tension measuring devices of high precision. These were intended to operate reliably in corrosive mine environment over long periods of time. After evaluating the existing systems, it was decided to develop a new type of roof bolt dynamometer which would fulfill the above requirements at minimal Cost. Nearly one hundred such dynamometers were constructed, calibrated and installed in two underground mines. They remained in service for a period of one Year, producing a valuable database for the Project. In this paper the working principle of this new type of dynamometer will be described and technical considerations and samples of the collected data will be given.|
Additional chapters/articles from the SME-ICGCM book Proceeding of the Fifth Conference on Ground Control in Mining (ICGCM)
|Expanded Cement: New Solutions for Age-Old Problems||Determination of Effective Column Lengths for Resin-Grouted||How to Design an Efficient Roof Bolting Plan Based on Simple||Donut Cribbing--A Hew Heavy-Duty Roof Support Concept||Development of A Yielding Steel Post||Design Procedure for Arch Canopies for Rehabilitation of Hig||Investigation of Some Alternatives to Timber Posts and Cribs||Design and Field Testing of a Mobile Roof Support for Retrea||Change in Primary Roof Support System at Quarto Mining Compa||Remote Mining Using Water for Ground Support||New Type of Load Cell for Monitoring of Roof Bolt Tension||Field Measurements of Chain Pillar Response to Longwall Abut||Integrated Instrumentation Method of Stress State, Material||A Study of Roof Caving in the Eastern U.S. Coalfields||A Simple Tool to Measure Stress in Mine Backfill||Optimization of the Stress Control Method to Improve Product||Effect of High Horizontal Stress on Coal Mine Entry Intersec||Analysis of Small-Scale Thrust Faults and Their Effect on Co||A Case History of Computer-Aided Lineament Analysis for Grou||Designing for Upper Seam Stability in Multiple Seam Mining||Behavioral Aspects of Roof/Rib Injuries--Implications for Tr||Engineering Classification of Shales||Empirical Approach to Calculate Rock Loads in Coal Mine Road||Assessment of the Rockburst Proneness in Hard Rock Coal Mine||Outburst Control in Underground Coal Mines,||The Effect of Immediate Strata on Pillar Behavior in Retreat||Roof Control Problems on Development and Longwall Gateroads||A Case Study of Longwall Roof-Supports Interaction||Tailgate Support Evaluation at Plateau Mining Company||Methods of Controlling Hard Roof in a Longwall Face|