title: Estimation of the change in hydraulic conductivity above mined longwall panels.
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.
authors.affiliation: Coffey Geotechnics, Level 18, Tower B, Citadel Towers, 799 Pacific Highway Chatswood, NSW, Australia. paul.tammetta@coffey.com.
authors.forename: Paul
authors.initials: P
authors.lastname: Tammetta
mesh_terms: D060587:Groundwater; D062070:Hydrology; D008906:Mining