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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A Simple Time-Dependent Chart of Extension Fracture Initiation within Brittle Homogenous and Heterogeneous Rock Pillars in Hard Rock Mining
TL;DR: A simple empirical time-dependent chart of extension fracture initiation is described in this paper, which is suitable for predicting extension fracture initiations and extends of fracturing as time progress, predicting the allowable time to install an effective support system and estimate the stability of the rib pillars within a brittle homogenous and heterogeneous rib pillars in a high stress environment.
Journal ArticleDOI
Application of the yield pillar technique for successful depillaring under stiff strata
TL;DR: In this paper, double-section contiguous depillaring of a 12.6 m coal seam under massive and uncaveable sandstones is described, and the design procedure adopted for yield pillars and the results of long-term pillar displacement monitoring are given.
Journal ArticleDOI
Modeling violent rock failures in tunneling and shaft boring based on energy balance calculations
Zoheir Khademian,U. Ozbay +1 more
TL;DR: In this paper, a numerical methodology for quantitatively studying the occurrence and intensity of violent failures in tunneling and shaft-boring operations has been proposed, which enables estimating the radiated energy as a measure for evaluating the occurrence of violent failure with various intensities.
Journal ArticleDOI
Experimental and Numerical Investigation on the Role of Energy Transition in Strainbursts
Fuqiang Gao,Lei Yang +1 more
TL;DR: In this paper, the role of energy evolution and transition during strainbursts and how it is influenced by surrounding rocks was investigated, and the result has provided direct evidence of the conversion of elastic energy stored within a rock into the forms of kinetic energy to be released during the strainburst process.
Journal ArticleDOI
Localization of deformation and its effects on power-law singularity preceding catastrophic rupture in rocks:
TL;DR: Three distinct length scales are involved in the deformation evolution and catastrophic rupture of heterogeneous rocks in general: two essential ones are the specimen size macroscopically and the g... as discussed by the authors.
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.
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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.