By pioneering the investigation of inflexion points specific to rectangular tunnels and employing advanced finite element analysis, this work offers a thorough comparison of the Mohr-Coulomb and Hardening Soil models. Readers will uncover critical insights into soil parameters that significantly impact shield and pipe roof support through an insightful parametric study. Additionally, the book develops a comprehensive design chart illustrating parameter values for varying tunnel size ratios, all backed by meticulous numerical analyses using state-of-the-art PLAXIS 2D software. This essential resource is perfect for engineers and researchers eager to deepen their understanding of rectangular tunnel dynamics and design.