<p>This research investigates the dynamic response of rock tunnels within the challenging geological structures of the Himalayan region. It specifically focuses on the excavation impact in the Geometrically Folded Syncline and Anticline types of folds. The basis of the study is the degree of deformation in the surrounding rock structure. The research has 5 phases for identifying the geological structure with the highest vulnerability. Initially, the study began with simulating tunnels within different types of rocks: Igneous (Granite), Metamorphic (Quartzite), and Sedimentary (Sandstone). It has been discerned, according to the simulations performed, that tunnels within Igneous rock formations exhibited heightened susceptibility to disruption. Since the Horizontal sides of the model had been restrained, after the first phase of the simulation, only vertical displacements were considered further. Then expanding on this, the Ramsay classification of fold tunnels was incorporated to categorize the mechanics of folds, determining all three distinct classes, i.e., Class 1 (1a, 1b, 1c), 2, and 3 folds. The vulnerability of each fold class to excavation had been assessed through FEA. Then further investigation involved exploring the positions of tunnels within the most vulnerable fold type and examining crown, inflexion point, and limb positions. Conclusively, this paper has established the most favourable tunnel shape, which may withstand the most vulnerable geological structure in Himalayan terrains. The outcomes of this study not only bridge the research gap but also provide better guidelines for future references. It offers valuable insights for picking and choosing the right type of tunnel design and construction strategies in vulnerable and complex geological settings.</p>