Another methodology to study the stability of the tunnel face is limit analysis. In this context, Davis et al. [16] proposed an initial solution for cohesive materials, where as Leca and Panet [17] and Leca and Dormieux [18] proposed upper and lower bound solutions for cohesive-frictional materials. Recent research has been focused on the development of improved failure geometries (see e.g.,Refs. [19,20]), leading to failure surfaces that are developed point-to-point and that allow rotational failure modes that affect the whole excavation front [21,22].