In general, fine-grained sedimentary rocks are characterized by low strength and deformability properties, a condition that worsens in case of being affected by a fault. Due to this, the excavations made in this type of rock mass have high deformation and convergence values. As a case study, the present research was developed in the gallery of the Chánguena fault, located in the south zone of Costa Rica. This research gallery was excavated in intercalations of sandstone and shale. The convergences of the gallery were monitored along the whole length, obtaining maximum measured values of the order of 6% of the excavation diameter.

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