Topographic Influence of Longwall Mining on Ground‐Water Supplies

D. Elsworth, J. Liu

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The extent of potential aquifer dewatering resulting from underground longwall mining is determined through application of a nonlinear finite‐element model. The model represents the form of the body strain field that accompanies mining‐induced subsidence, and uses strain magnitudes to define the modified hydraulic conductivity field. The model is applied to test the sensitivity of the induced strain field to ground surface topography. The location and extent of three characteristic zones of conductivity enhancement are defined, representing gravitational detachment above the panel, shear failure above the abutment, and extensile deformation at the ground surface. Correspondingly, well completion locations are ranked with their potential for dewatering representing relatively high potential in upland areas and relatively low potential in valley base locations. These results amplify and offer a phenomenological explanation of observational data. Modeling results are compared with several documented studies in the Appalachian coal fields and favorable agreement achieved.

Original languageEnglish (US)
Pages (from-to)786-793
Number of pages8
JournalGroundwater
Volume33
Issue number5
DOIs
StatePublished - Sep 1995

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Computers in Earth Sciences

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