| Abstract: | The typical initial piezometric response to longwall undermining is a decline in head due to the opening of fractures and bedding planes during early subsidence. However, in studies over two active longwall mines in southern Illinois, temporary rises in head just before subsidence were observed in piezometers constructed in low-permeability units. Although the initial phase of subsidence is considered dilational, these head increases indicate compressional effects that raise pore-water pressures. Possible mechanisms are shear stresses at the leading edge of subsidence or transmission of stress related to dewatering of underlying permeable units. |
| Genre: | Article |
| ProdID: | 70021021 |
| Citation Author: | Booth, C. J.; Curtiss, A. M.; Demaris, P. J.; Van Roosendaal, D. J. |
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| Citation End Page: | 417 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental and Engineering Geoscience |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Anomalous increases in piezometric levels in advance of longwall mining subsidence; 1999; Article; Journal; Environmental and Engineering Geoscience; Booth, C. J.; Curtiss, A. M.; Demaris, P. J.; Van Roosendaal, D. J. |
| Citation Start Page: | 407 |
| Citation Volume: | 5 |
| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Anomalous increases in piezometric levels in advance of longwall mining subsidence; 1999; Article; Journal; Environmental and Engineering Geoscience; Booth, C. J.; Curtiss, A. M.; Demaris, P. J.; Van Roosendaal, D. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1999 00:00 -0600 |
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