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Study On The High-Pressure Grouting Of The Overburden For Subsidence Control
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Guo, W. J. (1994). Study On The High-Pressure Grouting Of The Overburden For Subsidence Control. Proceedings of 13th International Conference on Ground Control in Mining
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Guo, W. J. (1994). Study On The High-Pressure Grouting Of The Overburden For Subsidence Control. Proceedings of 13th International Conference on Ground Control in Mining
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SpreadSheed (CSV)
Organization: International Conference on Ground Control in Mining
Pages: 5
Publication Date:
Jan 1, 1994
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Abstract
Abstract
| Overburden movement as a result of longwall mining can be classified into, in ascending order, caving zone, fractured zone, and bending zone. Operation experience and laboratory research have demonstrated that there are bed separations in the bending zone due to differential movement and rock mechanics properties between adjacent strata. In china several coal mines have injected flyash into bed separations to prevent strata movement and control surface subsidence. This method is very effective because it can reduce surface subsidence by 35-55%. Combining the field survey results and laboratory simulation research, the author has investigated bed separation and its mechanisms and effect of backfilling the bed separation and its mechanisms. Finally backfilling application in three mines are introduced, including grout flow chart, grouting pressure, and radius. |
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