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

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, , , , and
Edited by:
Anon

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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.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Overburden deformation and hydrologic changes due to longwall coal mine subsidence on the Illinois Basin
ISBN:
0947571922
Issue:
200
Year Published:
1991
Language:
English
Publisher:
Publ by Int Assoc of Hydrological Sciences
Publisher location:
Wallingford, United Kingdom
Larger Work Title:
IAHS Publication (International Association of Hydrological Sciences)
First page:
195
Last page:
204
Number of Pages:
10
Conference Title:
Proceedings of the 4th International Symposium on Land Subsidence
Conference Location:
Houston, TX, USA
Conference Date:
12 May 1991 through 17 May 1991