As a decision-making problem, selecting proper machines and equipment plays a key role for mining sites and companies. Many factors affect this decision, and values belonging to these factors can be expressed numerically and/or non-numerically. In order to make the most appropriate decision, engineers must carry out an evaluation process that comprises all criteria that might affect decision-making. To achieve this, multi-criteria decision-making tools are used. As a result of technological developments, coal outputs in longwall mining have risen tremendously over the last decades, and longwall mechanisation has become unavoidable. The significance of powered roof supports in particular increases dayby-day, since the rate of roof support has to be in accordance with the rate of face advance in longwalls.In this study, an integrated fuzzy analytic hierarchy process and fuzzy goal programming model is used to select the most suitable powered roof supports. The procedure is applied to a real-life underground coal mine that is operated using the longwall method. Seven alternative powered roof supports are compared with each other, taking a total of 24 decision criteria under four main topics into account. In conclusion, the most suitable roof supports for the mine under study are determined and recommended to the decision-makers of the system. OPSOMMINGʼn Die selekteer van die regte masjinerie en toerusting speel ʼn sleutelrol vir myn werwe en mynmaatskappye. Daar is baie faktore wat dié besluit beïnvloed en numeriese of nie-numeriese waardes kan aan hierdie faktore toegeken word. Om die regte besluit te neem, moet ingenieurs al die kriteria wat die besluit mag beïnvloed oorweeg. Hiervoor word multi-kriteria besluitnemingstrategieë gebruik. As gevolg van tegnologiese ontwikkelinge, het die steenkoolontginning van ondergrondse myne drasties toegeneem en is meganisering van dié myne onvermeidelik. Die belang van aangedrewe plafonstutte het veral toegeneem as gevolg van die vinnige tempo van skag verlenging.ʼn Wasige analitiese hiërargieproses en wasige doelbeplanningsmodel word gebruik om die gepaste aangedrewe plafonstutte te kies. Die prosedure word toegepas op ʼn ondergrondse steenkoolmyn. Sewe aangedrewe plafonstutte word met mekaar vergelyk; die vergelyking neem 24 besluitnemingskriteria, wat onder vier hoofafdelings verdeel is, in ag. Gevolglik word die mees geskikte plafonstut gekies en aanbeveel.
Machining has considerably increased with evolving technology and increasing demand in natural stone production facilities. Different types of accidents may occur in natural stone facilities during movement, dimensioning, cutting of blocks and surface processing. These accidents may be due to physical, chemical, ergonomic and mechanical conditions. Therefore, possible work accidents and occupational diseases should be investigated. In this study, an L-matrix analysis is conducted to analyze hazards and forecast risks in natural stone facilities. According to the L-matrix results, three major initiating events are identified. For each of these initiating events, event tree analysis is used to calculate risk scores. These initiating events are hoist rope fatigue and breaking, diamond wire fatigue and breaking, and electrical leakage due to old systems. These events and their results are classified according to the probabilities using event tree analysis.
In underground metal mines, drilling and blasting is widely used production method. Drilling holes is especially a time consuming operation. The aim of this study is to examine and analyze drilling operation and its duration in underground ore and dead rock. Drillability experiments are carried out on samples taken from the field. In core sampling two different types of core samples are taken whether it is parallel or perpendicular to ore bedding and dead rock. Results of drillability experiments are compared between the two types of core samples. DRI values are found to be 51 and 47 for the parallel and perpendicular core samples to ore bedding, respectively. DRI values for the parallel and perpendicular core samples to dead rock bedding are found to be 57 and 55 for the, respectively. In addition, graphs of drilling speed and drilling depth belonging to ore and dead rock are analyzed. It is examined that drilling speed increases steadily to maximum point in the first 5sec. and stays stable after that point. Therefore, it is concluded that production galleries and holes which are formed parallel to bedding would increase production efficiency.
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