The Resource A model study of the application of roof bolts under unsymmetrical loading conditions, by Friedrich H. K. Esser

A model study of the application of roof bolts under unsymmetrical loading conditions, by Friedrich H. K. Esser

Label
A model study of the application of roof bolts under unsymmetrical loading conditions
Title
A model study of the application of roof bolts under unsymmetrical loading conditions
Statement of responsibility
by Friedrich H. K. Esser
Creator
Author
Language
eng
Summary
"When coal is extracted by the long wall mining method, two gate-roads on either side of the working face are driven with the advancing operation. In the surroundings of these openings the state of stress which existed prior to mining is not only disturbed by the drifting process of the gate-roads but also by the coal extraction in the long wall, resulting in an "unsymmetrical" stress distribution. Varying incremental pressure components and the high complexity of strata movements make it extremely difficult to control the rock behavior under unsymmetrical conditions by conventional support. Application of roof bolts as an auxiliary support can improve the control of the strata surrounding long wall gate-roads. To indicate the qualitative effect of roof bolts on the stress distribution around underground openings in stratified rock under unsymmetrical loading conditions, composite models made of photo-elastic material were tested in a 6 ft. diameter centrifuge, providing proper loading conditions. Stress distributions were permanently "frozen" into the models while under load. Test results indicate that the high shearing stresses which occur near the rigid abutment of the long wall gate-road and the bending stresses in the roof beams can be reduced considerably by the application of roof bolts in proper pattern arrangements. Since this study was concerned with the development of an experimental technique and simple structural conditions were chosen, an extension of this investigation to more complicated conditions is possible"--Abstract, page i
Member of
Cataloging source
UMR
http://library.link/vocab/creatorDate
1932-
http://library.link/vocab/creatorName
Esser, Friedrich H. K.
Degree
M.S.
Dissertation year
1962.
Granting institution
University of Missouri. School of Mines and Metallurgy
Illustrations
  • illustrations
  • photographs
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
Label
A model study of the application of roof bolts under unsymmetrical loading conditions, by Friedrich H. K. Esser
Instantiates
Publication
Note
Vita
Bibliography note
Includes bibliographical references (pages R1-R5)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
1048008189
Extent
1 online resource (xi, 102, R6 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations, photographs.
Specific material designation
remote
System control number
(OCoLC)1048008189
Label
A model study of the application of roof bolts under unsymmetrical loading conditions, by Friedrich H. K. Esser
Publication
Note
Vita
Bibliography note
Includes bibliographical references (pages R1-R5)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
1048008189
Extent
1 online resource (xi, 102, R6 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations, photographs.
Specific material designation
remote
System control number
(OCoLC)1048008189

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