Helmut Schweiger
Graz University of Technology
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Featured researches published by Helmut Schweiger.
Archive | 2014
Helmut Schweiger; Pouya Sedighi; S Henke; K Borchert
Ground improvements methods such as mixed-in-place and jet grouting techniques have proven to be efficient auxiliary measures for deep excavations constructed in poor ground conditions. Although the design is primarily based on empirical rules, numerical methods are frequently employed in order to assess the deformation behaviour of these structures, but increasingly also to evaluate the stress state in the treated soil. This requires the use of appropriate constitutive models capturing the main features of the mechanical behaviour, notably their limiting tensile strength and initiation of cracks. In this paper a newly developed constitutive model is applied to simulate the behaviour of a jet grout panel supporting a deep excavation against uplift pressure. It could be shown that a reliable estimation of the stress distribution and crack patterns in the slab can be obtained providing a basis for optimization with respect to tension piles or geometry of the jet grout slab.
Geotechnical Safety and Risk V | 2015
G Katsigiannis; Helmut Schweiger; P Ferreira; Raul Fuentes
This paper focuses on the derivation of design prop loads for supported excavations in stiff clay with increasing excavation depth and number of prop levels. For multi-propped walls there are a number of empirical graphs to obtain the design prop forces. CIRIA C517 (Twine & Roscoe, 1999) enhancing Terzaghi & Pecks work (Terzaghi & Peck (1967) and Peck (1969)) and making it more relevant in the UK practice, suggests the Distributed Prop Load (DPL) method based on 81 case histories and field measurements of prop loads. Similar guidance and empirical graphs exist in other countries such as the EAB Recommendations in Germany (Recommendations on Excavations: EAB, 3rd Edition, 2014). The design prop loads derived by empirical graphs (both CIRIA and EAB which are widely used in the UK and Germany respectively) and Finite Element methods are compared in the context of Eurocode 7 requirements. The German recommendations give prop loads in better agreement with the numerical analysis results. Suggestions are made to update the CIRIA guidance in line with the German recommendations and give different shapes of pressure distribution for supported walls with different number of prop levels. This can result in more realistic predictions of prop loads for upper layers, particularly in deep excavations, and hence more economic design.
Computers and Geotechnics | 2015
Franz Tschuchnigg; Helmut Schweiger; Scott W. Sloan
Geotechnique | 2015
Franz Tschuchnigg; Helmut Schweiger; Scott W. Sloan; A. V. Lyamin; I. Raissakis
Computers and Geotechnics | 2015
Franz Tschuchnigg; Helmut Schweiger; Scott W. Sloan
ISRM International Symposium | 2000
J. P. Carter; Chandra S. Desai; D. M. Potts; Helmut Schweiger; Scott W. Sloan
Computers and Geotechnics | 2015
Franz Tschuchnigg; Helmut Schweiger
8th European Conference on Numerical Methods in Geotechnical Engineering | 2014
Bert Schädlich; Helmut Schweiger
geotechnik | 2014
Helmut Schweiger
geotechnik | 2015
Laurentiu Floroiu; Helmut Schweiger