Abstract
Investigations of bedrock within subsided areas over abandoned coal mines in Illinois reveal little disturbance of the bedrock. In areas that have surface subsidence of 0. 3 to 1 m (1 to 3. 25 ft), examination of cores from exploration drilling and investigations of the boreholes by means of closed circuit television have shown that fractures are spaced at least 0. 9 to 3. 6 m (3 to 12 ft) apart. The amount of fracturing found in the collapsed area decreased as the amount of soft, weak materials increased in the immediate overburden of the mine.
| Original language | English (US) |
|---|---|
| Title of host publication | Transactions of the American Institute of Mining, Metallurgical, and Petroleum Engineers, Society |
| Pages | 1955-1960 |
| Number of pages | 6 |
| Volume | 280 |
| Edition | pt A |
| State | Published - 1986 |
| Externally published | Yes |
ASJC Scopus subject areas
- Engineering(all)