Geomehanske numerične analize vplivov gradnje predorov na površino

With the development of information technology, the possibilities of a detailed geomechanical analysis with the application of numerical methods have become an indispensable design tool for underground structures in different ground.Using numerical analyses, we often come across with input parameters problems and boundary conditions. Too little awareness of the influence on analysis results of the latter can easily lead us to an incorrect interpretation of the performed analyses and consequently inappropriate input parameters for underground structure design. With the purpose to research the influences of input parameters on ground deformation and structural forces in lining results, several 2D and 3D parametric analyses have been performed. The influence of boundary conditions, mesh density and initial stress on calculated movements and stresses in ground-support system has been researched. 2D and 3D modelling procedures with different elasto-plastic constitutive model shave been verified on the case study of two tunnels, which were constructed in different geotechnical conditions. A comparison has been made between the results of 2D and 3D analyses by using the Mohr Coulomb and Hardening Soil models.The calculated deformation values have been compared with the measurements that were carried out during the construction of two road tunnels.