The project Corredor Bioceanico Aconcagua (CBA) is a future rail line between Chile and Argentina with a length of about 215km. An important component of the CBA project is the 53km long base tunnel (BT), which will allow crossing the Andes most directly and with moderate inclination (Figure 1, below). The construction of the BT is divided into two different phases. First a single-tube, single-track tunnel will be constructed and operated. In a second phase, a second parallel tube will be added, so that a twin-tube, single-track rail tunnel will be available.
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