✍ Scribed by J. Liu; D. Elsworth; R. J. Matetic
No coin nor oath required. For personal study only.
A methodology for calculating strains that accompany mining is used to estimate the post-mining modi®cation of the hydraulic conductivity ®eld and the change in the regional and local subsurface water system. The techniques yield reasonable agreement with recorded changes in water levels for reasonable and defensible choices of material parameters in validation exercises at an instrumented longwall site. Water level changes recorded above the twin panel longwall con®guration are complex and varied. However, they may be explained through consideration of the mining-modi®ed conductivity ®eld alone. Changes in hydraulic conductivity are independently corroborated from the results of in situ permeability tests, conducted before and after mining, that con®rm the overall in¯uence of mining-induced strains. These resulting patterns of hydraulic conductivity enhancement enable direct explanation of observed water level changes.
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