| Type of Document |
Master's Thesis |
| Author |
Burke, Lisa Michelle
|
| Author's Email Address |
lburke@vt.edu |
| URN |
etd-05132003-150725 |
| Title |
Numerical Modeling for Increased Understanding of the Behavior and Performance of Coal Mine Stoppings |
| Degree |
Master of Science |
| Department |
Mining and Minerals Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| Westman, Erik Christian |
Committee Chair |
| Iannacchione, Anthony T. |
Committee Member |
| Karfakis, Mario G. |
Committee Member |
|
| Keywords |
- UDEC
- numerical modeling
- FLAC
- stoppings
|
| Date of Defense |
2003-04-02 |
| Availability |
unrestricted |
Abstract
To date, research has not focused on the behavior of concrete block stoppings subjected to excessive vertical loading due to roof to floor convergence. For this reason, the failure mechanism of stoppings under vertical loading has not been fully understood. Numerical models were used in combination with physical testing to study the failure mechanisms of concrete block stoppings. Initially, the behavior of a single standard CMU block was observed and simulated using FLAC. Full-scale stoppings were then tested in the Mine Roof Simulator and modeled using UDEC. Through a combination of physical testing and numerical modeling a failure mechanism for concrete block stoppings was established. This failure mechanism consists of development of stress concentrations where a height difference as small as 1/32” exists between adjacent blocks. These stress concentrations lead to tensile cracking and, ultimately, premature failure of the wall.
|
| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
|
| 28.8 Modem |
56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
Higher-speed Access |
| |
thesis_final2.pdf |
2.04 Mb |
00:09:27 |
00:04:52 |
00:04:15 |
00:02:07 |
00:00:10 |
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