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|Historically, the selection of mining sequence for multiple seam conditions has been based on many factors other than ground control considerations and minimization of interaction effects. Today, numerous operations are finding themselves mining above existing or abandoned operations, some of which exhibit large scale caving, pressure arches and subsidence troughs. Development of design criteria for the upper seam that would alleviate damage due to lower seam interaction effects can contribute substantially to the safety and productivity of many mining operations. The primary objective of this re search has been to identify methods of improving ground control conditions in the upper seam when mining through either passive or active subsidence waves. These methods concentrate on improved ground control practices for the upper seam, rather than reducing the amount of subsidence in the upper seams by improved practices in the lower seam. Design factors such as pillar size, pillar and opening orientation relative to the subsidence trough, offsetting intersections, and different support methods have been studied for the upper seam in a variety of typical geologic environments. Analysis has demonstrated criteria for ameliorating negative interaction effects and facillitating design in the superincumbent seam.|
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|