Deformed shape and contours of absolute displacement (in m) of the ET tunnel for different positions of the face of the NT excavation. Face of NT: (a) −40 m from axis of ET; (b) −20 m from axis of ET; (c) −10 m from axis of ET; (d) at axis of ET; (e) 10 m from axis of ET; (f) 20 m from axis of ET; (g) 40 m from axis of ET; (h) 60 m from axis of ET