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Estimation of the Change in Hydraulic Conductivity Above Mined Longwall Panels
Authors:Paul Tammetta
Institution:1. 612 9406 1000612 9406 1002;2. Coffey Geotechnics, Level 18, Tower B, Citadel Towers, 799 Pacific Highway Chatswood, NSW, Australia
Abstract:The change in hydraulic conductivity (K) above subsided longwall panels at underground coal mines is determined using a data base of pre‐mining and post‐mining K measurements made at multiple locations down the depth profile at each of a number of sites worldwide. Results show that, following caving of roof strata, there is a clear difference in the magnitude of changes in K above and below the top of the collapsed zone. Within the collapsed zone, relative increases in K are larger, even when taking account of measurements made in potentially unsaturated strata. A generalized conceptual model is presented for K change above subsided longwall panels. These results form a third independent database supporting the height of desaturation reported in an earlier study.
Keywords:
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