Effect of orientation of fracture zone on tunnel behavior - Numerical Investigation

This paper concerns the effect of orientation and geometric characteristics of a fracture zone on the tunnel behavior using a numerical investigation. A parametric study was executed on a number of drill and blast tunnelling cases representing different fracture and tunnelling conditions using two and three dimensional finite element analyses. The variables considered include the strike and dip angle of fracture zone relative to the longitudinal tunnel axis, the width and the clearance of the fracture zone, the tunnel depth, and the initial lateral stress coefficient. The results of the analyses were examined in terms of the tunnel deformation including crown settlement, convergence, and invert heave as well as shotcrete lining stresses. The results indicate that the tunnel deformation as well as the shotcrete lining stress are strongly influenced by the orientation of the fracture zone, and that such a trend becomes more pronounced for tunnels with greater depths

keywords: Drill and blast tunnel, Finite element analysis, Deep tunnel, Fracture zone, 발파 굴착 터널, 유한요소해석, 대심도 터널, 파쇄대

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Article Contents

Vol.15 No.3

Effect of orientation of fracture zone on tunnel behavior - Numerical Investigation

Abstract

Reference

(사)한국터널지하공간학회