In the tunnel construction process, good planning is needed regarding the support system that matches the rock class in the tunnel. One of the support systems is shotcrete. Shotcrete is a mortar that is sprayed with high strength towards a surface. However, to get the thickness of the required shotcrete, the rock class in the tunnel must be obtained. To find out this, an empirical method is needed that approaches the rock mass classification. Based on the analysis that has been done, there is 1 type of lithology that is traversed in the tunnel, namely metamorphic rock in the form of schist with RMR ranging from 39-50 and high debris load of 4.27-3.5 meters.

Topics
Metamorphic petrology
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