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- Title
Bewertung der Nachweiskonzepte nach EC7 für Baugrubenwände in Sand auf Grundlage der Finite‐Elemente‐Methode.
- Authors
Seibel, Elisabeth; Vrettos, Christos; Hettler, Achim
- Abstract
Assessment of verification concepts acc. to EC7 for excavation retaining walls in sand based on the finite element method The current draft of the new version of EN 1997 distinguishes for the numerical calculations of retaining structures between verification approaches with different application of partial safety factors: either on the effects of actions, or on the shear strength parameters of the soil. Comprehensive numerical studies based on the finite element method for representative system geometries were carried out and the results were evaluated. Various systems with different boundary conditions with regard to support, groundwater level, excavation depth and embedment depth were considered. Internal forces were determined for all systems. Overall, it was found that both verification methods deliver similar values for shear forces and bending moments along the wall. The two variants for the approach using reduction factors for the shear strength of the soil were compared; both variants yielded different results due to the different initial conditions with an a priori reduction of the shear parameters of the soil on the one hand and a reduction only in decisive calculation phases on the other. A comparison with the current analytical method according to Blum in accordance with the recommendations of the EAB showed that other embedment lengths are necessary in the FEM due to different stress distributions along the wall in order to fulfill the verification of the embedment length. The degree of earth support fixity in the FEM calculations is less than in an analytical calculation acc. to Blum.
- Subjects
GEOTECHNICAL engineering; EXCAVATION; STANDARDS
- Publication
Bautechnik, 2022, Vol 99, Issue 12, p865
- ISSN
0932-8351
- Publication type
Article
- DOI
10.1002/bate.202200059