Title page for ETD etd-03042009-040821


Type of Document Master's Thesis
Author Hosca, Erhan
URN etd-03042009-040821
Title Numerical analyses of the effectiveness of secondary tailgate support systems :a stability approach
Degree Master of Science
Department Mining Engineering
Advisory Committee
Advisor Name Title
Haycocks, Christopher Committee Chair
Karmis, Michael E. Committee Member
Smith, Charles W. Committee Member
Keywords
  • Materials
Date of Defense 1995-01-15
Availability restricted
Abstract

A numerical model was developed to analyze the effectiveness of active and passive secondary support systems on the stability of a retreating longwall tailgate opening. The range of loading conditions that any tailgate can be subjected to was identified to form the basis of numerical modeling. The tailgate entry was considered as a part of roof-pillar-floor system, whose behavior is controlled largely by the structural integrity of each member. Numerical modeling was then conducted on tailgate openings to determine roof, floor, and rib responses, including failure modes to a variety of loading conditions for wood cribs and roof trusses employed as active and passive means of secondary support. Trends were developed from numerical modeling to determine optimum load capacity and paints of application for reducing the potential for entry failure.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
[VT] LD5655.V855_1995.H673.pdf 13.40 Mb 01:02:03 00:31:54 00:27:55 00:13:57 00:01:11
[BTD] next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.

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.