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Featured researches published by Helmut Schweiger.


Archive | 2014

Numerical modelling of ground improvement techniques considering tension softening

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

Design of Deep Supported Excavations: Comparison Between Numerical and Empirical Methods

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

Slope stability analysis by means of finite element limit analysis and finite element strength reduction techniques. Part I: Numerical studies considering non-associated plasticity

Franz Tschuchnigg; Helmut Schweiger; Scott W. Sloan


Geotechnique | 2015

Comparison of finite-element limit analysis and strength reduction techniques

Franz Tschuchnigg; Helmut Schweiger; Scott W. Sloan; A. V. Lyamin; I. Raissakis


Computers and Geotechnics | 2015

Slope stability analysis by means of finite element limit analysis and finite element strength reduction techniques. Part II: Back analyses of a case history

Franz Tschuchnigg; Helmut Schweiger; Scott W. Sloan


ISRM International Symposium | 2000

Computing And Computer Modelling In Geotechnical Engineering

J. P. Carter; Chandra S. Desai; D. M. Potts; Helmut Schweiger; Scott W. Sloan


Computers and Geotechnics | 2015

The embedded pile concept – Verification of an efficient tool for modelling complex deep foundations

Franz Tschuchnigg; Helmut Schweiger


8th European Conference on Numerical Methods in Geotechnical Engineering | 2014

A new constitutive model for shotcrete

Bert Schädlich; Helmut Schweiger


geotechnik | 2014

Influence of EC7 design approaches on the design of deep excavations with FEM

Helmut Schweiger


geotechnik | 2015

Parametric study of the seismic ground response of a linear visco-elastic soil layer improved by stone columns or pile-like elements

Laurentiu Floroiu; Helmut Schweiger

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Franz Tschuchnigg

Graz University of Technology

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Bert Schädlich

Graz University of Technology

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P Ferreira

University College London

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Wulf Schubert

Graz University of Technology

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Nedim Radoncic

Graz University of Technology

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A. V. Lyamin

University of Newcastle

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J. P. Carter

University of Newcastle

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