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   <subfield code="a">On the loss of stability of rock around workings and holes</subfield>
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   <subfield code="a">Conclusions: 1. It is established on the basis of plasticity theory [1, 2] that an increase in Poisson's ratio and angle of internal friction raises, while an increase in the decay modulus and dilatancy lowers the stability of rock around spherical and cylindrical workings. 2. It is demonstrated that consideration of the translimiting deformation of rock and the Coulomb-Mohr strength criterion can be used with a higher degree of confidence than the criterion of maximum normal stress to interpret test results on the hydrorupture of holes [15], and, consequently, to determine the stress in the intact mass by this method.</subfield>
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