https://communities.bentley.com/products/geotech-analysis/f/forum/238329/bentonite-layerHello everybody I am modeling a deep caisson that is lowered into a deep hole as in the picture, using plaxis 3D Question: How can I put a 5cm layer of bentonite between the caisson wall and the soil, so that the caisson comes down easily and preventsen-USTelligent Community 12https://communities.bentley.com/thread/742051?ContentTypeID=1Thu, 17 Nov 2022 12:31:15 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:8879fbf5-c5db-4d64-bf62-c7e58c482c8dMohamad Raad<p>Dear Dhyaa, I would recommend that you go through the manual and read about the Interface input as your question seems related to it. I guess you can model it by assigning bentonite properties to the interface, or by simply assigning a proper value for Rinter (very small value) for adjacent soils which simulates the cohesionless interaction of wall/soil. However, I&#39;m sure the experts will reply to you in a bit, so hang on!</p><div style="clear:both;"></div>