Title page for ETD etd-05132003-150725


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

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.