3D finite element analysis of a deep excavation and comparisonwith in situ measurements

摘要

The paper describes the analysis of a deep excavation project in clayey silt in Salzburg. Theexcavation was supported by a diaphragm wall, a jet grout panel and three levels of struts. Because of insufficientinformation on the material properties of the jet grout panel the stiffness of it was varied in a parametric study.Theeffect of taking into account the stiffness of a cracked diaphragm wall on the deformations was also investigated.In some of the 3D calculations a non-perfect contact between diaphragm wall and strut was simulated by meansof a non-linear behaviour of the strut. The evaluation of the results and comparison with in situ measurementsshowed that analyseswhich took into account the reduced stiffness of the diaphragmwall due to cracking achievedthe best agreement with the measurements. Furthermore settlements of buildings could be best reproduced bythe three-dimensional model.