Diaphragm Wall : Weird Results

Question

Hello everyone, Hope you're doing well. 
 We're getting some weird internal forces results at the top of a diaphragm wall. It's not the first time that this happens, so we wanted to know whether there is something to which we should pay more attention. 
 Thank you

Faseel Khan · Answer

From the screenshots it looks like there are some very thin elongated elements all along the corner joint. May be that needs attention but without the project it is more difficult for me to give you a straight answer. To assist you further please submit a service request. Then, one of our support engineers can help you in detail: https://apps.bentley.com/srmanager/ProductSupport

Stefanos Papavasileiou · Answer

Indeed, that can be related to a small inaccuracy introduced when drawing (creating) the plate surfaces. 
 As Faseel mentions, without the project, it is difficult to say what causes it, but you can already check the geometry by using this command in Structures and Mesh mode: 
 checkgeometry 
 This command checks if objects overlap or are adjacent and gives a list of items with their distance. So please check here the geometry that is marked as being close by. 
 In some cases, this command does not give any feedback. This command by default takes a distance tolerance related to the model's size. If the command does not give this info, then add a parameter to this command, e.g. 0.01 to check all geometry that is located within 0.01 m: 
 checkgeometry 0.01 
 You can also check the size of the of the intersected objects in Mesh mode to locate problems. To do so, make use of the tabulate command, see the examples below. You might want to adjust the numbers below to fit your model's size. 
 #To find small Surfaces: 
 tabulate Surfaces "Area" "Area<0.5" 
 #To find small Polycurves (e.g. used for Tunnels): 
 tabulate Polycurves "Length" "Length<0.1" 
 #To find small Volumes: 
 tabulate Volumes "Volume" "Volume<1" 
 #To find small SoilVolumes: 
 tabulate SoilVolumes "Volume" "Volume<1" 
 
 The list of Volumes might be different from SoilVolumes if you model volumes outside the borehole soil layers. 
 More details on the tabulate command, see here: https://communities.bentley.com/products/geotechnical1/w/wiki/45942/obtaining-tabulated-data-from-plaxis-input 
 Please try to locate all potential problematic geometry in your model in Input and fix them. Note that not all reported objects are necessarily problems that need to be fixed.