Resumo

DE GRAAF, W.W.  e  SPITERI, W.. A preliminary qualitative evaluation of a hydraulic splitting cylinder for breaking rock in deep-level mining. J. S. Afr. Inst. Min. Metall. [online]. 2018, vol.118, n.8, pp.891-897. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2018/v118n8a13.

Hydraulic rock-splitting cylinders have proved successful in numerous civil and construction applications. The purpose of this study was to conduct a preliminary qualitative evaluation of the applicability of the hydraulic splitting cylinder in deep-level mining with the aim of recommending equipment modifications and operational practices. The particular instrument used in the study was the DARDA^® hydraulic splitter. Conventional drill-and-blast practice in deep-level mining often impacts adversely on the immediate environment. Alternatives are periodically sought for efficient, continuous, and safe rock-breaking in situations where conventional blasting is undesirable. A considerable amount of investigation work has been conducted by mining companies, equipment manufacturers, and research institutions on numerous methods of non-explosive mining, including the use of the hydraulic rock-splitter. Several trials were conducted underground. The most challenging aspect of in mechanical rock-splitting is to create a second free face in the stope, and the trials evaluated four different 'cut' layouts to achieve this objective. The trials highlighted the limits of the equipment in its current phase of development, as well as the importance of quality drilling in terms of collaring the hole, hole length, and directional accuracy. In the presence of a second free face the splitter becomes far more effective. The unit is simple in design and is easily integrated into existing mining operations. It also does not require a technically skilled workforce or expensive maintenance. Rock-breaking with the use of a rock splitter could have a place in niche applications in an underground mining operation, with some equipment modifications and further development of the process to establish a free-breaking face. General operational difficulties experienced underground during the trials are summarized and possible solutions recommended.

Palavras-chave : rock-breaking; mechanical splitting; hydraulic splitter.

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