Abstract

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Title:: Modeling of the temperature field during drifting of transport tunnels in cryolithic zone

Author(s):: ISAKOV A; GUDKOVA I; Department of Survey, Design, and Construction of the Railways and Roads, Siberian State University of Railway Engineering, Novosibirsk 630049, Siberian, Russia

Keywords:: tunnel engineering; cryolithic zone; rock thawing; thermal boundary layer; heat equation

Abstract:: A mathematical model and algorithm for solving axisymmetric problems associated with determining the transient thermal field around a cylindrical stonedrift were described. A distinctive feature of the proposed model was introducing an air thermal boundary layer at the contact with the inner boundary of stonedrift in the formulation of the problem. The algorithm for this model was tested by calculating the thawing depth in a rock massif located in permafrost zone in the Far Eastern Part of Russia. The results show that these calculations yielded the thawing depth, which depends upon the thickness of heat insulating layer outside the tunnel lining. The article also presents the results for calculating the thawing depth for a rock mass along the tunnel’s length when both sides of the tunnel are excavated.