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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Influence of specimen height-to-width ratio on the strainburst characteristics of Tianhu granite under true-triaxial unloading conditions
X.G. Zhao,Ming Cai +1 more
TL;DR: In this article, a better understanding of the strainburst phenomenon is presented, which poses a significant threat to the safety of workers and stability of underground structures, and the authors propose a method to detect the strainbursts near excavation boundaries.
Journal Article
Pillar design in coal mines
TL;DR: In this article, the authors pointed out that bord-and-pillar mining is the most important method of coal extraction in South American underground coal mines, and advocates that pillar design procedures should be refined to make more rational allowance for the differences in strength properties between various coal seams and roof and floor strata.
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Numerical Study of Failure Mechanisms and Control Techniques for a Gob-Side Yield Pillar in the Sijiazhuang Coal Mine, China
TL;DR: In this article, the authors investigated the failure of a 7m-wide coal pillar that caused the large deformation of a tailgate in the Sijiazhuang coal mine in China.
Journal ArticleDOI
Simulation of unstable rock failure under unloading conditions
Amin Manouchehrian,Ming Cai +1 more
TL;DR: In this paper, the authors discuss the most hazardous problems in deep hard-rock mines, such as rockburst, where the rocks are loaded under a polyaxial condition before excavation, and upon excavation, the rocks at...
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The influence of roadway backfill on the coal pillar strength by numericalinvestigation
TL;DR: In this article, the influence of roadway backfill on coal pillar stability was analyzed based on over 120 numerical models of various pillar height and backfill percentage, and it was indicated that the pillar strength will increase with increasing roadway back-fill, while the increase in pillar strength is greater for tall pillars than squat pillars for both cohesive and non-cohesive backfill.
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.