Temperature effects on stress–strain behavior of underground openings in permafrost zone

• Published in: IOP Conference Series: Earth and Environmental Science
• Main Authors: Baryshnikov, VD, Gakhova, LN
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: IOP Publishing 2020
• Subjects: permafrost
• Online Access: http://dx.doi.org/10.1088/1755-1315/523/1/012010; https://iopscience.iop.org/article/10.1088/1755-1315/523/1/012010/pdf; https://iopscience.iop.org/article/10.1088/1755-1315/523/1/012010

Abstract The authors describe the research results on the temperature effects on the stress–strain behavior of rock mass around single openings driven in permafrost beyond the influence zone of stoping. The variation patterns of stresses and displacements in rock mass and at the boundary of an underground opening are found depending on its operating life and ventilation air temperature. In terms of the Aikhal mine of ALROSA, it is shown that in an opening at a depth of 350 m, given its ventilation temperature is 20 deg for 3 years, the vertical convergence is comparable with elastic displacements caused by the opening driving. An approach is proposed to determining rock stability category based on expected displacements of an opening during its ventilation. The research results are meant for guidelines and regulatory documents on justification of mine support designs in permafrost zone.