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

Vasily Baryshnikov

First published: 2018-06-20https://doi.org/10.5593/sgem2018/1.3/s03.045View metrics

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 -1.5В°? at a depth of 350 m, with the ventilation temperature of 20В°? 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.

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Publication details

Title
EFFECT OF TEMPERATURE ON STRESS STATE OF MINE EXCAVATIONS IN PERMAFROST ZONE
Authors
Vasily Baryshnikov
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Science and Technologies in Geology, Exploration and Mining
Publisher
STEF92 Technology
Year
2018
Pages
351-356
SWS Citekey
Baryshnikov20183351356
ISSN
1314-2704
ISBN
978-619-7408-37-9
Language
en
Publication type
Conference Paper
Proceedings contents
Open official contents
Keywords
permafrost zonemine excavationsupporttemperaturedisplacementsstresses
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