Overburden deformation and hydrologic changes due to longwall coal mine subsidence on the Illinois Basin

J. T. Kelleher, D. J. Van Roosendaal, B. B. Mehnert, D. F. Brutcher, Robert A Bauer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Subsidence-induced deformation and hydrologic changes were studied at two active longwall coal mines in Illinois using surveying and geotechnical monitoring. Surface subsidence characteristics fall into a range common to other Illinois longwall operations. Subsidence-induced water level fluctuations correlated with mining activity and the passing of the dynamic subsidence wave. Aquifer thickness and lateral extent affect these fluctuations. Bedrock water levels completely recovered at site 1 and partially recovered at site 2. Comparison of pre-and post-subsidence logs showed increased fracture frequency and decreased seismic velocities in the overburden at site 1. Deformation monitoring at site 2 showed only small vertical differential displacements within the overburden, suggesting a nearly uniform drop of the subsided rock mass and a caved zone extending less than 6 m above the mine. Mechanisms of overburden deformation observed at both sites include bedding separations and shear within incompetent formations.

Original languageEnglish (US)
Title of host publicationIAHS Publication (International Association of Hydrological Sciences)
Editors Anon
PublisherPubl by Int Assoc of Hydrological Sciences
Pages195-204
Number of pages10
Edition200
ISBN (Print)0947571922
StatePublished - Jan 1 1991
EventProceedings of the 4th International Symposium on Land Subsidence - Houston, TX, USA
Duration: May 12 1991May 17 1991

Publication series

NameIAHS Publication (International Association of Hydrological Sciences)
Number200

Other

OtherProceedings of the 4th International Symposium on Land Subsidence
CityHouston, TX, USA
Period5/12/915/17/91

ASJC Scopus subject areas

  • Engineering(all)

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