Plaxis 3D, how to reduce the size of model
Dear Forum users, problem: how to reduce a size of large model keeping same horizontal and vertical stress in the model. Although my question is based on the Plaxis 3D tunnel, it is just a modelling problem. So if anyone who has already worked with reduced model, or anyone have idea, how could be the solution, i will be thankful for your help. problem: I want to model a tunnel excavation case without groundwater table. Tunnel cover (Depth of rock above the tunnel) is very high about 1500 m. and tunnel is of 5 m diamerer. Modelling such large depth of rock and small tunnel its hard to analyse the tunnel. In one side i could not zoom well to see the output diagrams. On other side it takes much long time in calculaiton. So i have reduced the size of model with about 100 x 100m of soil block. The weight of the soil/rock lying above it i have given as a distributed load (Gamma x H). Similarly in horizontal direction (Ko. gamma. H) from both side. My problem is that in the reduced model i get the similar vertical stress but very less horizontal stress in comparison to not reduced model. Following calculation to make it more clear unit weight 26 kN/m
