Erich Bauer | Graz University of Technology (original) (raw)

Papers by Erich Bauer

IntechOpen eBooks, Mar 31, 2021

and became a consultant engineer for NHRI in June 2011. He has been working on testing and modeli... more and became a consultant engineer for NHRI in June 2011. He has been working on testing and modeling the static and dynamic behavior of earth and rockfill materials and has published more than seventy technical papers in national and international journals and conference proceedings. Dr. Fu has participated in consulting works for more than thirty dams of different types, including the DaShiXia Concrete Faced Gravel Dam in Xinjiang (247 m in height) and the RuMei Earth Core Rockfill Dam in Tibet (315 m in height). He is now the secretary of the Soil and Rock Mechanics Committee in the Chinese Hydraulic Engineering Society and is a member of the Chinese National Committee on Large Dams.

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Jun 1, 1995

GeoFlorida 2010, Feb 15, 2010

The focus of this paper is on modeling the essential mechanical properties of moisture sensitive ... more The focus of this paper is on modeling the essential mechanical properties of moisture sensitive weathered coarse-grained materials like rockfill materials using a hypoplastic constitutive model. The model is based on the current void ratio, the effective stress, a moisture dependent solid hardness and the rate of deformation. Creep and stress relaxation during the time-dependent process of degradation of the solid hardness are also taken into account. Herein the solid hardness is related to the grain assembly in the sense of a continuum description and does not mean the hardness of an individual grain. The calibration of the model is performed for weathered broken granite and the performance of the model is demonstrated for triaxial compression tests under dry and water saturated conditions. The prediction of the model is compared with the corresponding experimental results.

Waste and Biomass Valorization, Mar 1, 2023

The focus of this paper is on modelling the mechanical behaviour of weathered and partly saturate... more The focus of this paper is on modelling the mechanical behaviour of weathered and partly saturated grains of rockfill material using a hypoplastic constitutive model based on the current void ratio, the effective stress, a moisture dependent granular hardness and the rate of deformation. Creep and stress relaxation during the time-dependent process of degradation of the granular hardness are also taken into account. The calibration of the model is performed for weathered broken granite and the deformation behaviour of an artificial rockfill dam is numerically investigated.

Based on the analysis of main characters of weathered rockfill materials,the deformation of rockf... more Based on the analysis of main characters of weathered rockfill materials,the deformation of rockfill due to a change of the moisture contents can be forecasted using an extended Gudehus-Bauer hypoplastic model.The updated model takes into account a moisture sensitive granular hardness;and it can reflect the influence of density,stress state,rate of deformation and moisture content on the nonlinear,inelastic stress strain behavior of rockfills.Numerical simulation is carried out to simulate the evolution of deformation and stress of a core-wall type rockfill dam during the first water impounding.The results are reasonable.

Key Engineering Materials, Jun 1, 2007

In this paper the interface behavior between an infinite strip of a granular mate- rial and a rou... more In this paper the interface behavior between an infinite strip of a granular mate- rial and a rough boundary under plane shearing is numerically investigated using a micro-polar continuum approach. Particular attention is paid to the influence of a fluctuation of micro-polar boundary conditions along the interface on the evolution of shear strain localization within the granular material. The mechanical behavior of the cohesionless granular material is described with a micro-polar hypoplastic model. The evolution equations for the stress and the couple stress are non-linear tensor valued functions which model inelastic behavior. The investigations show that the micro-polar boundary conditions have a strong influence on the location and thickness of the zone of strain localization when relative displacements within the interface are excluded.

In this paper the mechanical behavior of a soilbag under an increasing vertical compression is nu... more In this paper the mechanical behavior of a soilbag under an increasing vertical compression is numerically investigated using a micro-polar continuum approach. Particular attention is paid to the influence of the interaction between the filling material and the bag on the evolution of the stress strain behavior of the soilbag structure. The mechanical behavior of the cohesionless granular material is

Acta Geotechnica, Feb 27, 2007

This paper focuses on the influence of the initial void ratio on the evolution of the passive ear... more This paper focuses on the influence of the initial void ratio on the evolution of the passive earth pressure and the formation of shear zones in a dry sand body behind a retaining wall. For the numerical simulation a rigid and very rough retaining wall undergoing a horizontal translation against the backfill is considered. The essential mechanical properties of cohesionless granular soil are described with a micro-polar hypoplastic model which takes into account stresses and couple stresses, pressure dependent limit void ratios and the mean grain size as a characteristic length. Numerical investigations are carried out with an initially medium dense and initially loose sand using a homogeneous and random distribution of the initial void ratio. The geometry of calculated shear zones is discussed and compared with a corresponding laboratory model test.

Springer series in geomechanics and geoengineering, 2011

The focus of this paper is on modeling the essential mechanical properties of weathered and moist... more The focus of this paper is on modeling the essential mechanical properties of weathered and moisture sensitive granular materials under dry and water saturated conditions using a state dependent solid hardness. Herein the solid hardness is related to the grain assembly in the sense of a continuum description and does not mean the hardness of an individual grain. Particular attention is paid to creep deformation initiated by water saturation of an initially dry material. First the constitutive model is outlined for isotropic loading paths. For general stress paths the influence of the stress deviator on creep deformation and stress relaxation is investigated with an extended hypoplastic model. The performance of the refined model is demonstrated for triaxial compression tests where the saturation of the material is investigated for different deviator stresses. The predictions of the model are compared with experiments.

International journal of computer applications in technology, 2009

In this paper the interface behaviour between a cohesionless granular soil and a rigid geogrid re... more In this paper the interface behaviour between a cohesionless granular soil and a rigid geogrid reinforcement under shearing is numerically investigated using a continuum approach. Particular attention is paid to the influence of grain size, initial density, vertical pressure and fluctuations of the rotation resistance of soil particles interlocked within the geogrid cells. To model the essential mechanical properties of granular soil a micro-polar hypoplastic description is used which takes into account stress and couple stress, pressure dependent limit void ratios and the mean grain size as the characteristic length. The results obtained from the 2D-finite element calculations show that the interaction of the reinforcement with the soil material has a strong influence on the deformation of the soil around the reinforcement.

Frontiers of Architecture and Civil Engineering in China, Jan 28, 2010

The wetting deformation of weathered rockfill materials has been attracting growing attention fro... more The wetting deformation of weathered rockfill materials has been attracting growing attention from both engineers and scientists. The importance of realistic predictions of wetting deformations for high earth and rockfill dams is a strong motivation to establish a suitable constitutive model. Recently, the hypoplastic constitutive model by Gudehus and Bauer was extended by introducing solid hardness depending on the state

Springer eBooks, 2006

In the present paper monotonic and cyclic shearing of a cohesionless granular layer is numericall... more In the present paper monotonic and cyclic shearing of a cohesionless granular layer is numerically investigated using a micro-polar hypoplastic continuum approach. The constitutive equations for the stress and the couple stress are non-linear tensor-valued functions and based on the concept of hypoplasticity [17]. The model was formulated by Tejchman [18], Tejchman and Gudehus [22], who extended a non-polar hypoplastic

Water science and engineering, Jul 1, 2016

In this paper, two different concepts for the constitutive modeling of the mechanical behavior of... more In this paper, two different concepts for the constitutive modeling of the mechanical behavior of creep-sensitive rockfill materials are presented. Specifically, the performance of an extended generalized plasticity model proposed by Wang is compared with a simplified version of the hypoplastic constitutive model for weathered rockfill materials proposed by Bauer. Both models can reflect the influence of the mean stress on the incremental stiffness, the peak friction angle, and the dilatancy angle. The so-called solid hardness defined for a continuum description and originally introduced by Bauer is embedded in both models. Hydrochemical, thermal, and mechanical weathering are usually caused by environmental changes and are taken into account in a phenomenological description with an irreversible and time-dependent degradation of the solid hardness. A degradation of the solid hardness is usually accompanied by creep deformation of the stressed rockfill material. It is shown that appropriate modeling of creep deformation requires at least a unified description of the interaction between the time-dependent process of degradation of the solid hardness and the stress state. In this context, the solid hardness can be understood as a key parameter for describing the evolution of the state of weathering of the rockfill material. Particular attention is also paid to the necessary procedure for determining the constitutive constants of the two different constitutive models. Finally, the performance of the two different constitutive models is demonstrated by comparing the results obtained from numerical simulations with experimental data from the creep-sensitive rockfill material.

The technologies for construction of roller-compacted concrete (RCC) dams have been considerably ... more The technologies for construction of roller-compacted concrete (RCC) dams have been considerably developed during recent years in China. At the time being, they have been successfully applied to the constructions of even extreme-high gravity dams and medium to high arch dams. There are a few of hundreds of RCC dams (RCCD) under design and/or construction in China. One of the main concerned technical problems according to the construction is about the understanding of the property of seepage in RCCDs and the relevant theory and methods for the control of the seepage. In order to overcome the problem, the senior author has been engaged in a wide study on the property and methods for control of seepage in RCCDs for more than 10 years. The property of seepage, measures for watertightness and drainage, optimal design and construction schemes for control of seepage in the dams have been essentially understood either in theory and practice. The results have been applied for the construction and the backanalysis of several dams. The paper describes the research findings in detail with respect to the theoretical fundament and their application for a high RCC gravity dam.