<p>Underground construction, particularly tunneling, plays a critical role in urban development by enhancing accessibility and improving quality of life. This study examines the impact of twin-tunnel excavations on pile groups that support infrastructure such as bridges. The researchers employed three-dimensional (3D) modeling in ABAQUS to simulate a 2 × 2 pile group influenced by the excavation of twin tunnels, each with a diameter of 6.08&#xa0;m, in dry sandy soil using the deep cut method. By incorporating an advanced hypoplastic soil model, the analysis demonstrates that maximum bending moments and lateral displacements primarily occur near the ground surface and the pile cap. These effects intensify with increasing load levels. As the applied load approaches the bearing capacity of the piles, the simulation reveals notable changes in settlement rates and axial force distribution among adjacent and opposite piles. Furthermore, the volume loss associated with tunneling significantly increases bending moments and displacements, while shear strains emerge due to interactions between the twin tunnels. The findings indicate that although working loads have a limited influence on lateral pile behavior, they substantially affect vertical responses. In contrast, volume loss exerts a considerable effect on both vertical and lateral pile performance, underscoring its critical role in tunnel-induced ground deformation.</p>