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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Book ChapterDOI
Dynamic Instability in Geomaterials Associated with the Presence of Negative Stiffness Elements
Elena Pasternak,Arcady Dyskin +1 more
TL;DR: In this paper, the authors investigate a simple elastic model of dynamic instability consisting of chains of oscillators some with negative stiffness springs and show that in a stable chain only one oscillator can have negative stiffness spring and formulate the criterion of stability.
Journal ArticleDOI
Analysis of Geomechanical Factors Affecting Rock Bursts in Sedimentary Rock Formations
Hamid Maleki,Heather Lawson +1 more
TL;DR: In this paper, a comprehensive study using site specific information from 25 case studies undertaken in U.S. mines was conducted to identify the most important variables contributing to coal bumps and violent failure of near seam strata.
Journal ArticleDOI
Heterogeneity and degradation in brittle materials
TL;DR: In this article, the concept of state of degradation is employed in order to consider the initial material (structure) inhomogeneity, and degradation and its patterning in simulated rock specimens subjected to external load are modeled numerically by implementing the theory for damage and surface degradation.
Journal ArticleDOI
Analysis of progressive failure of pillar and instability criterion based on gradient-dependent plasticity
TL;DR: In this article, a model for strain softening pillar is proposed considering the characteristics of progressive shear failure and strain localization, and post-peak stiffness is proposed according to analytical solution of averaged compressive stress-average deformation curve.
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.