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Fracture Zone Dewatering to Control Ground Water Inflow in Underground Coal Mines.
MISSING :84 pages
This Bureau of Mines investigation focuses on the identification and control of ground water inflow problems that occur in the active sections of underground Appalachian coal mines. A fracture inflow survey of eight underground mines was conducted. Three types of mine fracture intercepts were identified that are typical of wet section mining conditions. A mine in Preston County, West Virginia, was selected as the site for a fracture zone dewatering experiment. Fracture trace analysis was used to site dewatering wells in a fracture valley setting ahead of mine development. The design, implementation, and results of this dewatering experiment are presented. A hydrology simulator was also developed and applied to the fracture zone flow problem at the field site. The model uses a semianalytic, boundary integral technique to simulate fracture zones as discrete regions of high average permeability. Comparisons are made between simulated and actual dewatering results. This investigation suggests that fracture zones are responsible for the sudden release of stored ground water, which often occurs as mining sections advance beneath fracture valley topography. It is concluded, therefore, that dewatering operations that are designed to intercept the component of ground water that is stored in fracture zones will be most effective in controlling infiltration to active mine sections.
IH; Report of Investigations
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division