Author(s)

P. Prochazka & M. Kublenu

Abstract

LD BEM formulation of stability of tunnel face . Prochhzka & M. Kugbf mu kech Technical University, Prague, Czech Republic iE hstract L. tabiity of the tunnel face is very important in the engineering of nderground structures. The danger to workers being active at. the tunnel !& during excavation of soil and rock is extraordinary high because of $r knowledge of material properties of media surromding the rock in the is why fast algorithms are expected to creep). Moreover, improved Desai'a It enables one to consida appIy the boundary element W q u e . W much more f i c u l t . bundory Elcmans XXVI, C A. Brcbbla (Editor) 0 2004 WIT Rosq www.w*com, ISBN 1-85312-7- be available ie problem of tunnelstability according to current knowledge of ma&rial ppertieq which are available horn "in situn measurements. So far, the nite element metbad has been used for nonlinear and time-dependent ,mputations. Because of the neaimity for an iterative solution, the yputer time consumed may extend principall

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