three-dimensional numerical investigation of tunnel behavior based on different constitutive models and associated parametric analysis in rock medium

With the advancement of numerical modeling, predicting tunnels’ behavior before construction has become possible for designers. accurate prediction of tunnels’ behavior in diverse environments requires the compatibility of numerical simulations with ground conditions. although several constitutive models have been proposed for simulating ground characteristics, their appropriate utilization is crucial. in this study, the convergence of a tunnel is modeled, and the results are verified using actual convergence monitoring data. then, a series of finite element simulations are conducted on a hypothetical tbm tunnel to demonstrate the difference in deformations, ground surface settlements, and stresses in the lining resulting from tunnel excavation under seven constitutive models in rock media. the models are categorized into four groups: rock-specified, soil-established, and general. additionally, parametric studies are performed on specific gravity, poisson’s ratio, and dilation angle. the findings revealed that different constitutive models significantly influence numerical analysis results. rock-specified models were found to be more sensitive to parameter variation in rock media than soil-established and general models. moreover, changes in specific gravity and poisson’s ratio had a significant impact on the magnitude of surface settlements. overall, the study highlights the importance of appropriately selecting constitutive models and accurately defining material parameters in numerical simulations to ensure reliable predictions of tunnel behavior.