May I highly recommend the numerous papers of
Kurosch Thuro and Javier Macias
on the subject drillability factors (tunneling) and more.
Please have a look at their contribution lists. You will find a lot there.
Please determine the method of excavation. Look at Guenter's reply and also take a look at ITA site http://tunnel.ita-aites.org/en/how-to-go-undergound, http://tunnel.ita-aites.org/media/k2/attachments/public/ITA_Report_N2_WG19_P.pdf
and https://about.ita-aites.org/wg-committees/working-groups/211-ita-active-working-groups/working-group-14-mechanization-of-excavation
You must see all the geotechnical parameters, such as hardness of the rock, type of structures, filling of the fractures, type of rock, degree of alteration, quantity of water that circulates through your base level, sedimentation structures, you must apply 3d tests to the testics. Strictly speaking, you must consider everything that can cause an accident or that gives ground.
We use the criteria of bieniawski and laubscher.
luck
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