Masters Theses
A study of stress distribution and measurement of axial strain around a pilot hole during overboring
Abstract
"Stress distribution around a pilot hole during overcoring was investigated. A study of axial strain on the borehole surface was undertaken. Two-dimensional epoxy resin models were prepared and stress frozen in a centrifuge. The stress-frozen models were examined under a direct-viewing polariscope. The magnitude of axial strain and the effect of strain relaxation on the pilot hole were measured on blocks of brittle materials. Factors contributing to discing of core during the overcoring operation were investigated and a mechanism of failure postulated. The loading conditions simulating in situ, core and bit pressures were applied individually to the brittle models and axial strain readings were noted. Axial strain was found to be at a significant value and radical differences in stress levels were found within the overcored zone"--Abstract, page i.
Advisor(s)
Scott, James J.
Committee Member(s)
Beveridge, Thomas R. (Thomas Robinson), 1918-1978
Spokes, Ernest M., 1916-1995
Parry, Myron G.
Department(s)
Mining Engineering
Degree Name
M.S. in Mining Engineering
Publisher
University of Missouri at Rolla
Publication Date
1966
Pagination
vi, 75 pages
Note about bibliography
Includes bibliographical references (pages 56-60).
Rights
© 1966 Varakantham Sreedhar Reddy, All rights reserved.
Document Type
Thesis - Open Access
File Type
text
Language
English
Subject Headings
Stress concentration
Strain gages
Core drilling
Rock mechanics -- Mathematical models
Thesis Number
T 1870
Print OCLC #
5973520
Electronic OCLC #
896879057
Link to Catalog Record
Recommended Citation
Reddy, Varakantham Sreedhar, "A study of stress distribution and measurement of axial strain around a pilot hole during overboring" (1966). Masters Theses. 5743.
https://scholarsmine.mst.edu/masters_theses/5743
