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Stress fields and subsurface crack propagation of single and multiple rock indentation and disc cutting

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Summary

Indentation stress fields of one- and two-point loads applied on an ideal elastic half-space are presented. Laboratory observations, although few, are in surprisingly good agreement with long median and cone-type tensile cracks predicted by normal principal stresses. Results indicate that simultaneous loading by multiple indenters offers a possibility partly to control the direction and length of such cracks. This suggests the development of new cutter configurations with a possible increase in efficiency, as compared with present rock boring and rock cutting practice. A simple fracture mechanics calculation of the length of subsurface cracks is performed by applying indentation fracture studies of ceramics. Results demonstrate the influence of material parameters such as fracture surface energy, hardness and elastic constants.

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Authors and Affiliations

  1. Department of Mining and Underground Construction, Luleå University of Technology, Sweden

    Per-Arne Lindqvist

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  1. Per-Arne Lindqvist
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Lindqvist, PA. Stress fields and subsurface crack propagation of single and multiple rock indentation and disc cutting. Rock Mech Rock Engng 17, 97–112 (1984). https://doi.org/10.1007/BF01042712

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