A rock tunnel map is a specialized engineering drawing that records and communicates the geologic conditions, tunnel alignment, support requirements, and construction sequence for underground openings in rock. It synthesizes field mapping, borehole logs, seismic data, and geophysical surveys into a plan view and a series of cross sections that guide design and construction decisions. This evergreen explainer describes how rock tunnel maps are created, interpreted, and used by engineers, contractors, and owners to manage rock mass quality, groundwater, and risk over the life of a tunnel project.
