Read the latest articles of Journal of Rock Mechanics and Geotechnical Engineering at ScienceDirect.com, Elsevier’s leading platform of peer-reviewed scholarly literature In order to break down a hanging roof, a new method based on shock wave collision and stress superposition was developed. Fundamentals of stress waves. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> The definitions are largely based on input from: • ISRM Terminology (1975) • Handbook in Engineering geology and rock mechanics, issued by the Norwegian Rock Mechanics Group (NBG), (2000); The objective of this work is the investigation of potential modification of the Brazilian indirect tensile strength formula by the analysis of the relevant published laboratory data. Among the parameters under study, the specific charge and the hole diameter have a very high correlation coefficient with D_50 and D_80, so that in most of the proposed models, the correlation coefficient was higher than 0.9. history. Spalling and rock fall on level 1045 m in Kiruna mine due to a seismic event (Zhang 2016a). Rock mechanics has two missions to accomplish in mining engineering, as sho wn in Fi g. 1: (1) to destroy rock efficiently; (2) to make rock structures safe. Effect of loading rate on energy efficiency in rock. Rock mechanics challenges in rock drilling, 1.5.1. (Eng. CF mining can make mining wastes like waste rocks and tailings used in backfill, which is good for the, open working space so as to increase production scale. Spalling induced by blasting (Zhang 2016a). These m, coefficient (the ratio of the stored energ, process) (Kidybiski, 1981), and (5) Rock qualit, Rock mechanics challenges exist in various mining metho, either a high dilution or a high ore loss is often caused, or/and high ore loss; rock bursts due. A short summary of this paper. Control of caving boundary by excavating boundary tunnels. To improve the precision of compaction recovery, a depth compaction model has been proposed that involves both porosity and clay content. Engineering Rock Mass Classification. With the help of statistical analysis, the relation between proper fragmentation of the blast and performance and efficiency of other production systems was studied. All the current techniques poss, addition, sonic speed and density are easil, rock. • The stability of a particular rock slope is • governed by three main engineering geologic factors, Download PDF. Mine to mill optimisation will lead to a systematic reduction of production costs in an open mine. Then, specific drilling, specific charge and specific loading indices have been calculated and measured. Reduction of energy consumption in comminution is of significant importance in mining industry. under high loading rates than under low loading rates. (a) Misfires (undetonated explosives in blastholes); (b) Explosive leakage during charging operation or after t, the explosive to move out of the hole. Daniel Reveron. References. Journal of Rock Mechanics and Geotechnical Engineering (JRMGE) is concerned with the latest research achievements in rock mechanics and geotechnical engineering. Mine to mill optimization will lead to a systematic reduction of production costs in an open mine. READ PAPER. Image Source: Wikimedia: Klive Beach. Figure 6. These structures encompass building foundations, dams, slopes, shafts, tunnels, caverns, hydroelectric schemes, mines, radioactive waste repositories and geothermal energy projects: in short, any structure built on or in a rock … To reduce such energy consumption the energy efficiency in an individual operation such as blasting must be increased. It is a truly interdisciplinary subject, with applications in geology and geophysics, mining, petroleum and geotechnical engineering. It is recommended that coal from the Vorga-Shora site, characterized by a plastic layer thickness, Compaction correction is a key part of paleo-geomorphic recovery methods. to determine the correct angles. (3) Can underground mining use a ver, complete stress-strain curve for in-situ rock. This paper. Estimate of loading rate for a TBM m, Zhang ZX, Naarttijarvi T. Applying fundamental principles of stress waves to production blasting in LKAB, Conference & Exhibition on Mass Mining, Luleå, Swed, Zhang ZX. 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