Utveckling av parametriserad numerisk modell för spontberäkningar

Sammanfattning: Whenever a new building is to be constructed it is important to check the geological preconditions of the underlaying soil. To ensure the requirement on the functionality of the new structure it is therefore of importance to investigate the potential geotechnical problems that may occur and to prevent these from occuring. Today, many different software are used for different geotechnial design. These software are often developed for a specific purpose in mind and the user interface may come with certain limitations leaving the user wishing for other functionalities not included in the software. COMSOL Multiphysics is a finite element calculation software which is capable of doing calculations in a wide variety of physical problems. The calculations can be done on everything from electrical circuits to acoustics. The physics can then be coupled using the multiphysics function in COMSOL. An application builder tool is included in the software giving the user the ability to create a graphical user interface which can be used to control the calculation. Due to the limitations of using a geotechnical specific software in combination with the possibilities of modeling a wide variety of physical problems, in COMSOL, there is an interest to investigate the possibilities of doing geotechnical calculations in COMSOL and apply a user friendly graphical user interface to it. In this thesis, different methods of modeling deep excavations with a anchored sheet pile are tested in COMSOL Multiphysics which are then compared to the same calculation made in PLAXIS 2D and by hand. Later these results are evaluated and compared to each other by their complexity and reliability. A form with questions was handed out to geotechnicians which contributed with what they think is relevant to include in such graphical user interface in COMSOL. Their wishes, in combination with preferences, was then used to create a user friendly graphical user interaface that is able to control the calculation in COMSOL. The end result shows that it is possible to recreate the calculation process from PLAXIS in COMSOL with reasonable results. In the final grapical user interface, relevant parameters can be entered by the user and plots regarding the results can be viewed. The major difficulties in the calculation in COMSOL was to generate the correct pore pressure regarding what drainage type was selected in PLAXIS. Also the interface between the soil and the sheet pile was difficult to set up. If these challanges were solved correctly the model may have given an even better result. These challanges are therefore considered needing further investigations.