STABILITY ANALYSIS AND SUPPORT SYSTEM DESIGN OF JAJARM GOLBINI MINE TUNNEL NO 3

8th International Scientific Conference - SGEM2008, www.sgem.org, SGEM2008 Conference Proceedings/ ISBN: 954-918181-2, June 16-20, 2008, Vol. 1, 517-524 pp

ABSTRACT

For opening of blocks No. 7 & 8 of Golbini mine in Bauxite Jajarm region (Northern-
Khorasan province, Iran) a tunnel is excavated with horse shoes shape with 800 m
length. In this paper firstly, the tunnel section was modeled by FLAC2D software and
secondly the stability analysis were studied. Then a composition of shotcrete and steel
frame was offered. To reach an appropriate safety factor the shotcrete with 20 cm
thickness which utilized with steel bars IPE-140, IPE-160 and IPE-180 established and
amounts of safety factors were determined 1.34, 1.64 and 1.75 respectively.

Keywords: Tunnel Stability Analysis, Steel Frame, Convergence-Confinement, Ground Reaction Curve, Safety Factor