Fig. 4

Left: influence of Young’s modulus on the safety factor with \(K_0 = 1.5\), \(K_n = 2\) GPa/m \(\frac{d}{R} = 1,\) \(H = 300\, \text{m},\) \(\alpha = 40^\circ\), \(\varphi = 30^\circ\). Right: influence of the discontinuity stiffness parameters with \(K_0 = 1.5\), \(E = 2\times 10^9\) Pa, \(\frac{d}{R} = 1,\) \(H = 300\) m, \(\alpha = 30^\circ\), \(\varphi = 30^\circ\).