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Geometric quality assessment of in situ blocks in dimension stone quarries

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Abstract

The profitability of stone quarries depends on the appearance (color and texture) and, more importantly, on the size of the blocks, which is determined by the three-dimensional discontinuity pattern of the rock mass. However, to date there is no comprehensive criterion by which to assess the size of blocks in quarries. The aim of the study reported here is to identify factors that facilitate decision-making on the desirability of an individual block and ultimately on all blocks for extraction as a dimension stone. To this end, we first developed a novel algorithm to calculate the largest rectangular parallelepiped that can be placed inside a block and then defined a regularity factor (α) and a quarry block shape factor (q) that enable the geometric quality of the block to be assessed more accurately than currently possible. The sensitivity analysis of these factors showed that the change in angle relative to the change in spacing has the greater effect on the geometric quality. The proposed factors displayed a good performance in a comparison analysis of four sites of the Dareh Bokhari travertine quarry complex located in Mahallat, Markazi province, Iran. Based on the results, blocks at sites 2 and 4 have the lowest and the highest geometric quality, respectively, which is in accordance with the operational conditions at the respective sites. Moreover, comparison of the values of factor q obtained from applying various cutting planes indicated that to maximally increase block production capacity, the current cutting direction at site 4 should be adjusted 33° eastward.

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Acknowledgements

The authors express their sincere thanks to the managers of Dareh Bokhari quarries for their cooperation.

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The costs of this research were provided by the authors.

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Correspondence to Arman Hazrathosseini.

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Hazrathosseini, A., Mahdevari, S. Geometric quality assessment of in situ blocks in dimension stone quarries. Bull Eng Geol Environ 78, 2377–2385 (2019). https://doi.org/10.1007/s10064-018-1316-4

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