Fig. 3

Stresses along the discontinuity (\(x=0\) at the center of the tunnel) for \(H = 500\) m, \(K_0 = 1\), \(\alpha = 13.5^\circ,\) \(\frac{d}{R} = 1\). In this case, the initial normal stress is nearly constant due to the gentle slope of the fault \(\alpha = 13.5^\circ\).