| Popis: |
Since the society get more and more urban the cities get denser. New buildings have to fight for their space with older buildings. The space is limited and therefore supporting constructions and foundation improvement methods are used to enable the construction. Since our cities are often located near water, the buildings are founded on sediments of great thickness. The foundation is usually performed with driven concrete piles. Impact pile driving exposes the surrounding areas with vibrations. These vibrations are a threat to the older buildings and could damage them.On behalf of Tyréns AB, a project of such nature is studied using computer by a FE-analysis in the program PLAXIS 2D. This is done to see if these vibrations and their related deformations are possible to predict. This simulation has continuously been calibrated against measured field data from the reference project. The reference project is the construction of a brand new culture center in Umeå, Kulturväven. Tyréns AB has provided the author with data from the pre-investigations as well as field measurements regarding settlement and pore pressure. With these input data a computation model has been generated with both obtained and assumed material parameters. The finite element model has subsequently been subjected to a simulated vibration that has been created to match the vibrations in the real case.The study has shown that prediction of vibration generating works is partly possible. The long calculation time for the analysis makes the execution of the prediction more suitable for cases similar to the reference project. The computer simulation is performed in a two dimensional environment and if a three dimensional environment would have been used the result perhaps would have been more suitable. In cases where a dynamic analysis may be necessary, the pre-investigations should be designed in a way that suitable soil parameters could be evaluated for calculation of the supporting constructions and for simulation in the dynamic analysis. Validerat; 20140107 (global_studentproject_submitter) |
