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Estimation of the Change in Hydraulic Conductivity Above Mined Longwall Panels
Author(s) -
Tammetta Paul
Publication year - 2014
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/gwat.12153
Subject(s) - longwall mining , hydraulic conductivity , coal mining , geology , roof , mining engineering , base (topology) , coal , geotechnical engineering , soil science , engineering , mathematics , civil engineering , mathematical analysis , soil water , waste management
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.