| 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. |
| Genre: | Conference Paper |
| ProdID: | 70016746 |
| Citation Author: | Kelleher, J. T.; Van Roosendaal, D. J.; Mehnert, B. B.; Brutcher, D. F.; Bauer, R. A. |
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| Citation Editor: | Anon |
| Citation End Page: | 204 |
| Citation Issue: | 200 |
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| Citation Language: | English |
| Citation Larger Work Title: | IAHS Publication (International Association of Hydrological Sciences) |
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| Citation Number Of Pages: | 10 |
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| Citation Publisher: | Publ by Int Assoc of Hydrological Sciences |
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| Citation Search Results Text: | Overburden deformation and hydrologic changes due to longwall coal mine subsidence on the Illinois Basin; 1991; Conference Paper; IAHS Publication (International Association of Hydrological Sciences); Kelleher, J. T.; Van Roosendaal, D. J.; Mehnert, B. B.; Brutcher, D. F.; Bauer, R. A. |
| Citation Start Page: | 195 |
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| Citation Year: | 1991 |
| Type: | citation/reference |
| Text: | Overburden deformation and hydrologic changes due to longwall coal mine subsidence on the Illinois Basin; 1991; Conference Paper; IAHS Publication (International Association of Hydrological Sciences); Kelleher, J. T.; Van Roosendaal, D. J.; Mehnert, B. B.; Brutcher, D. F.; Bauer, R. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1991 00:00 -0600 |
| Publisher: | Publ by Int Assoc of Hydrological Sciences |
