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EFFECT OF TEMPERATURE ON STRESS STATE OF MINE EXCAVATIONS IN PERMAFROST ZONE

Baryshnikov, V. D.; Gakhova, L. N.; Andreev, R. Yu.
Abstract:
The choice of support design for mine excavations driven beyond the influence zone of stoping in the conditions of permafrost is governed by the service life of the excavations, geomechanical behavior of surrounding rock mass and by working temperature range of ventilation. The research findings on influence exerted by temperature on stress state of rock mass around a single tunnel are presented. Based on solution of quasistatic thermo-elastic problems, the mechanisms of change in the stresses and displacements at the tunnel boundary depending on the service life and temperature of ventilation of the tunnel are determined. For the specific mineral deposit, it is shown that in a tunnel driven in rock mass with the initial temperature of -1.5°? at a depth of 350 m, with the ventilation temperature of 20°? during 3 years, the vertical convergence is comparable with the elastic displacement caused by the tunnel drivage. The approach is proposed for determining rock mass stability category based on the estimated displacements at the boundaries of a single tunnel with regard to thawing of adjacent rock mass. The obtained results are meant for the use in development of standards and procedures for selecting and validating support designs for mine excavations in permafrost zone.
SGEM Research areas:
Year:
2018
Type of Publication:
In Proceedings
Keywords:
permafrost zone; mine excavation; support; temperature; displacements; stresses
Volume:
18
SGEM Book title:
18th International Multidisciplinary Scientific GeoConference SGEM 2018
Book number:
1.3
SGEM Series:
International Multidisciplinary Scientific GeoConference-SGEM
Pages:
351-356
Publisher address:
51 Alexander Malinov blvd, Sofia, 1712, Bulgaria
SGEM supporters:
Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
Period:
02-08 July, 2018
ISBN:
978-619-7408-37-9
ISSN:
1314-2704
Conference:
18th International Multidisciplinary Scientific GeoConference SGEM 2018, 02-08 July, 2018
DOI:
10.5593/sgem2018/1.3/S03.045
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