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|During the last two decades many research projects were conducted to study the load requirements for the powered supported longwall faces (1-6). Significant results had been achieved by these researches. Most of the previous studies were rarely designed to understand the mechanisms of interaction between the supports and the surrounding rock, or to correlate the stress conditions around longwall faces to the mining operations both in time and space. In case of the shield supported faces, the roof-to-floor convergence is very difficult to measure due to the high percentage of roof coverage. The external load on the supports can not be determined from the leg pressure data alone due to the existence of the lemniscate links. Therefore, there is a real need in that a simple engineering method be developed to monitor the variations of roof load on the shield supports, the roof-to-floor convergence and the roof stress restoration in the gob area as the mining proceeds. Only with the results of these measurements, a further understanding about the mechanisms of interaction between the supports and the surrounding rock can be achieved and a criterion of designing or selecting the optimum mechanical parameters of the shield supports can finally be developed.|
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|