Yielding pillar design in South African collieries

Simple item page
dc.contributor.authorOldroyd, Oldroyd
dc.date.accessioned2019-07-31T07:06:59Z
dc.date.available2019-07-31T07:06:59Z
dc.date.issued1997
dc.descriptionA project report submitted to the Faculty of Engmeering, University of the Witwatersrand, Johannesburg, in partial fulfilment of the requirements for the degree of Master of Science in Engineering.en_ZA
dc.description.abstractThree cases of pillar failure on Southern African Collieries have been studied to analyse the behaviour of both the pillars and the overlying strata. Each of the cases shows a different type ofpillar and strata behaviour during failure and thus provides an opportunity for back analysis. In the first case, pillars failed in a controlled fashion while the overlying strata behaved in an elastic fashion. In the second pillars failed in a controlled fashion while the surrounding strata behaved inelastically. In the third failure was initially controlled but became uncontrolled. Computer models have been run to determine the theoretical critical post peak pillar slopes and the results of these models have been compared with the actual pillar behaviour as derived from in-situ measurements during failure and that which might be predicted from the theory of controlled and uncontrolled pillar failure. Comparisons are also made with the expected behaviour implied from the results of in-situ strength tests carried out on small coal pillars to ascertain their load deformation characteristics. The results indicate that the behaviour of the pillars more closely resemble that predicted from in-situ tests carried out by Van Heerden4• The results also indicate inadequacies in using elastic methodologies to determine whether pillar failure will be controlled or uncontrolled.en_ZA
dc.description.librarianAndrew Chakane 2019en_ZA
dc.identifier.urihttps://hdl.handle.net/10539/27849
dc.language.isoenen_ZA
dc.subjectCoal mines and miningen_ZA
dc.subjectMining engineeringen_ZA
dc.subjectBarrier pillarsen_ZA
dc.subjectRock mechanicsen_ZA
dc.subjectCoal mines and mining -- Safety measuresen_ZA
dc.subjectCoal mines and mining -- Data processingen_ZA
dc.titleYielding pillar design in South African collieriesen_ZA
dc.typeThesisen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
Oldroyd David Christopher._Yielding pillar design.pdf
Size:
1.44 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
ETD Collection