Journal ArticleDOI
Stability, instability and design of pillar workings
TLDR
In this article, the stability of pillar workings is discussed by generalizing the simple mechanism of the laboratory test to the mining situation, and it is proved that the workings will remain stable, regardless of the magnitude of the convergence experienced by the pillars, if the minimum slope of the load-convergence relations is greater than the smallest eigenvalue of K taken with a negative sign.About:
This article is published in International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts.The article was published on 1970-11-01. It has received 227 citations till now. The article focuses on the topics: Stiffness matrix & Rock mass classification.read more
Citations
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Journal ArticleDOI
Interpreting strain burst in micropillar compression through instability of loading system
TL;DR: In this article, the authors analyzed the deformation process of the loading system and the pillar during the period of strain burst, and derived the critical condition of the instability of loading system.
DissertationDOI
Design considerations for longwall yield pillar stability
TL;DR: In this article, a yield pillar was divided into three zones, namely core, transition and rib zones, and a number of stability measures were introduced to evaluate the yield pillar stability, namely; yield pillar ratio (YPR), rib zone ratio (RZR), pillar bump index (PBI), and roof-to-floor convergence (C).
Journal ArticleDOI
Experimental investigation on influence of loading rate on rockburst in deep circular tunnel under true-triaxial stress condition
TL;DR: In this paper, the authors investigate the influence of loading rate on rockburst in a circular tunnel under three-dimensional stress conditions, and the true-triaxial tests were conducted on 100 mm×100 mm-100 mm cubic sandstone specimens with d50 mm circular perforated holes.
Book ChapterDOI
Residual Subsidence Over Abandoned Coal Mines
TL;DR: In this article, the authors discuss residual subsidence over abandoned coal mines, a time-dependent deformation of the ground surface resulting from readjustment of the overburden above a mine opening.
Using a Postfailure Stability Criterion in Pillar Design
TL;DR: The use of Salamon's stability criterion in underground mine design can prevent the occurrence of catastrophic domino-type pillar failure as mentioned in this paper, but this criterion requires computation of the local mine stiffness and knowledge of the post-failure behavior of pillars.
References
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Journal Article
A study of the strength of coal pillars
A.H. Salamon,M.D.G. Munro +1 more
TL;DR: In this paper, the strength of coal pillars in South African collieries is derived based on data obtained from a survey of actual mining dimensions, which include information concerning both stable and collapsed areas of mining.
Journal ArticleDOI
The failure of rock
TL;DR: In this paper, an analysis of the energy changes associated with the extension of Griffith cracks in tension and compression is made, which shows that the non-elastic behaviour can be described by a curved Griffith locus in the strain-stress plane.