Design Essential of Hard Rock Mass and Coal Strength With Practical Solved Problems.pdf

Design Essential of Hard Rock Mass and Coal Strength With Practical Solved Problems PDF






Sayfa Sayısı: 304

Baskı Yılı: 2011


Dili: İngilizce
Yayınevi: Evrim Yayınevi

There are many examples of good and bad practice in the management and ... About 23 billion tonnes of minerals, including coal, are produced each year. ... The mining industry in many countries is assuming increasing importance. ... The ... The bulk of rock excavated in mining globally is broken by drilling and blasting. ... In modern practice, they are often sensitized only as they are charged into a hole, ... Properties of interest in selecting fracture explosives include ...

6.13 MB Dosya boyutu
9789755032122 ISBN

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Güncel Notlar

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ACAR YALÇIN

KRAULAND et al.: ROCK MASS STRENGTH AND CLASSIFICATION 121 n :E g, .g E g 50 40 $0- 20 10 40 30 20 10 O (a) /ll/1 Mtne StRte m a s CSIR (b) Mine SUtte m & s CSIR Fig. 9. Rock mass strength for case studies in LaisvaU and Llngsele compared with rock mass strength as determined by three classification systems. strength and a better rock mass strength estimation method should be developed. This requires more case histories where the determined/estimated rock mass strength from the criteria/systems can be compared to the measured/determined rock mass strength. Keywords: Hard Rock Mass, Strength, Failure Criterion, Classification, Characterisation

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KORKMAZ YAVUZ

strengths of hard rock masses. Because of the ... been found to work well in practice. ... rock mass, and 0-o~ is the uniaxial compressive strength ... stress terms, to practical design problems it is necessary ... to be consistent, it is... 2.5 Empirical equations for evaluation of the rock mass strength and ... underground excavation stability mainly in hard rock /Barton et al, 1974/. ... The current practice for geological mapping and core logging should be improved for ....

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DOĞAN KARA

addressing the risks of deep hard rock mining has mostly been conducted under the auspices of the Chamber of Mines Research Organization, the Mine Health and Safety Council, and several collaborative research programs. Research work to mitigate the rockburst risk has focused on three main areas: (i) development of macro-layouts (e.g.

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ÖZTÜRK ÖZDEMİR

UNIAXIAL COMPRESSIVE STRENGTH C o (x 1000 psi) 0 50 100 150 SPECIMEN LENGTH L (in.) VARIATION OF COMPRESSIVE STRENGTH WITH SIZE C o = 35 x L-0.14 In this plot of the size effect on strength, a power function was used to best-fit the experimental data. NOTE, however, that beyond L=36 in. the size effect ceases to be of much consequence. Shear strength of rock, rock joints and rock masses – Problems and some solutions ; Rock mass characterization by means of advanced survey methods ; Representation of rock discontinuities in safety analysis of large dams ; Foundations on rock masses The impact of brittle behaviour of rocks on tunnel excavation design

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ÇELİK YILDIRIM

UNIAXIAL COMPRESSIVE STRENGTH C o (x 1000 psi) 0 50 100 150 SPECIMEN LENGTH L (in.) VARIATION OF COMPRESSIVE STRENGTH WITH SIZE C o = 35 x L-0.14 In this plot of the size effect on strength, a power function was used to best-fit the experimental data. NOTE, however, that beyond L=36 in. the size effect ceases to be of much consequence.