![]() An outline is then given of methods for rationalizing the selection of optimum remediation solutions based on the use of risk-based decision matrices for the quantification and comparison of costs. Some simple probabilistic approaches to the characterization of a crown-pillar rock mass are suggested to assist in determining the risk of crown-pillar failure by reference to previous experience. Even with such improvements, however, it is not always a simple matter to determine the most appropriate and cost-effective remediation method for a particular surface crown pillar. 7 Rai M A, Kramadibrata S, Ridho K W 2013 Mekanika Batuan ITB: Bandung. In consequence, particularly because of the high cost of closure requirements, considerable interest is being focused on improving methods of assessing the stability of surface crown pillars. The sample was weighed using a digital balance to obtain natural rock mass. Establishing whether the remediation of specific surface hazards arising from mining activity is necessary in a given situation is not always straightforward. In many countries mines are now required to file closure plans and post bonds for decommissioning. Updated aids to application of the guidelines are presented for applying the mining Scaled Span concept for determining both mine opening and civil tunnel cover thicknesses of variable quality. This paper presents an updated methodology and a new chart developed through use of logistic regression techniques aimed at improving the ease of application of the Scaled Span method of Surface Crown Pillar dimensioning for assessing collapse risk. The fact that problems from collapses of near-surface workings have plagued mining operations for years led to the development nearly 20 years ago of the Scaled Span empirical design guidelines for crown pillar rock thickness dimensioning. The difficulties of predicting behaviour and of correctly dimensioning crowns is borne out by the fact that in recent years there have been a number of highly publicized near-surface mine working cave-ins and urban tunnel collapses, with breakthroughs to surface that have in several cases seriously damaged surface infrastructure. Xxvii, 482 halaman: gambar, tabel 25 cm.Assessing collapse risk for any near surface mine opening or for a civil tunnel is challenging, while defining an appropriate minimum rock cover thickness that should be left above the crown is a particularly difficult design task. Mekanika batuanRAI, Made AstawaRock mechanics - Civil engineering Mekanika batuan - Teknik SipilITB Press2014IndonesiaBook:Book624.15132 RAIxxvii, 482 halaman: gambar, tabel 25 cm.ai:oms-137512 Mengenal dan menafsirkan tentang asal-usul dan mekanisme pembentukan suatu struktur geologi akan menjadi lebih mudah apabila kita memahami prinsip-prinsip dasar mekanika batuan, yaitu tentang konsep gaya (force), tegangan (stress), regangan (strain) dan faktor-faktor lainnya yang mempengaruhi karakter suatu materi atau bahan. ![]()
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