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Keywords: constitutive model, finite element modelling, rock salt, underground structures.

Summary

Within the frame of a national joint research project, five participants performed benchmark like calculations on a three-dimensional underground structure in the rock salt of the Angersdorf mine in northern Germany [1]. The aim of the project was to evaluate the ability of the models to correctly describe the relevant deformation phenomena in rock salt under various influences, (i.e. transient and steady-state creep, the evolution of dilatancy and damage, short-term failure and long-term creep failure, post-failure behaviour and residual strength) and to increase confidence in the results of numerical simulations and enhance the acceptance of the results.

In our institute the finite element code ADINA was used to study the mechanical behaviour of rock salt [2]. A new viscoplastic constitutive model for rock salt that can describe the volumetric strain (dilatancy) and the damage of the rock salt has been proposed and implemented in this code [3]. The model parameters for the numerical simulation have been evaluated on the available laboratory experiments [4,5]. The Angersdorf salt mine consists of a regular pattern of large rooms and pillars at a depth of about 530 m. Therefore, a three-dimensional vertical section was chosen as a representative model. In the first step of the calculations, the initial state of stress taking into account the creep behaviour of the rock salt and the clay layer has been determined. After excavation of the main room and different drifts the calculations have been continued over 100 years. The benchmark results and the comparison of several results with in situ measurements have shown that the numerical model is able to describe the main behaviour of the rock salt such as transient and steady-state creep, dilatancy and material damage around underground openings. A comparison of calculation results from five project partners was performed in a number of papers [1,6].

References

1: A. Hampel, R.-M. Günther, K. Salzer, R.-M. Günther, W. Minkley, A. Pudewills, B. Leuger, D. Zapf, K. Staudtmeister, R. Rokahr, K. Herchen, R. Wolters, K.-H. Lux, O. Schulze, U. Heemann, U. Hunsche, "Bencharking of Geomechanical Constitutive Models for Rock Salt", Proc. 44th US Rock Mechanics Symposium (ARMA 2010), Salt Lake City/Utah/USA, 27-30.06.2010, American Rock Mechanics Association (ARMA), 2010.
2: Adina R & D Inc., ADINA (Automatic Dynamic Incremental Nonlinear Analysis), Report ARD 01-9, Watertown, MA, US, 2010.
3: A. Pudewills, "Numerical modelling of the long-term evolution of EDZ; development of material models, implementation in finite-element codes and validation", FZKA-7185, Karlsruhe, Forschungszentrum Karlsruhe, 2005.
4: IFG, "Langzeitsicherheitsnachweis Grube Teutschenthal, Fortschreibung unter besonderer Berücksichtigung eines Sicherungs- und Verwahrungskonzeptes für das Grubenfeld Angersdorf", Institut für Gebirgsmechanik GmbH, Leipzig, 16.01. 2006.
5: O. Schulze, U. Heemann, U. Zetsche, A. Hampel, A. Pudewills, R.-M. Günther, W. Minkley, K. Salzer, Z. Hou, R. Wolters, R. Rokahr, D. Zapf, "Comparison of advanced constitutive models for the mechanical behavior of rock salt - results from a joint research project, I. Modeling of deformation processes and benchmark calculations", in K.H. Lux, W. Minkley, M. Wallner, H.R. Hardy, Jr., (Editors), "Proc. of the Sixth Conf. on the Mechanical Behavior of Salt (Saltmech 6)", Basic and Applied Salt Mechanics, Hannover, Taylor & Francis (Balkema), London, 77-88, 2007.
6: A. Hampel, K. Salzer, R.-M.Günther, W. Minkley, A. Pudewills, B. Leuger, D. Zapf, R. Rokahr, K.D. Herchen, R. Wolters, U. Düsterloh, "Joint Projects on the Comparison of Constitutive Models for the Mechanical Behavior of Rock Salt - II. Overview of the models and results of 3-D benchmark calculations", Proc. of the 7th Conference on Mechanical Behavior of Salt, Paris, 16-19.04, submitted for publication, 2012. doi:10.1201/b12041-33

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 100 PROCEEDINGS OF THE EIGHTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY Edited by: B.H.V. Topping Paper 110 Simulation of the Long-Term Behaviour of an Underground Structure in Rock Salt A. Pudewills Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, (KIT-INE), Eggenstein-Leopoldshafen, Germany doi:10.4203/ccp.100.110 purchase the full-text of this paper Full Bibliographic Reference for this paper A. Pudewills, "Simulation of the Long-Term Behaviour of an Underground Structure in Rock Salt", in B.H.V. Topping, (Editor), "Proceedings of the Eighth International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 110, 2012. doi:10.4203/ccp.100.110 Keywords: constitutive model, finite element modelling, rock salt, underground structures. Summary Within the frame of a national joint research project, five participants performed benchmark like calculations on a three-dimensional underground structure in the rock salt of the Angersdorf mine in northern Germany [1]. The aim of the project was to evaluate the ability of the models to correctly describe the relevant deformation phenomena in rock salt under various influences, (i.e. transient and steady-state creep, the evolution of dilatancy and damage, short-term failure and long-term creep failure, post-failure behaviour and residual strength) and to increase confidence in the results of numerical simulations and enhance the acceptance of the results. In our institute the finite element code ADINA was used to study the mechanical behaviour of rock salt [2]. A new viscoplastic constitutive model for rock salt that can describe the volumetric strain (dilatancy) and the damage of the rock salt has been proposed and implemented in this code [3]. The model parameters for the numerical simulation have been evaluated on the available laboratory experiments [4,5]. The Angersdorf salt mine consists of a regular pattern of large rooms and pillars at a depth of about 530 m. Therefore, a three-dimensional vertical section was chosen as a representative model. In the first step of the calculations, the initial state of stress taking into account the creep behaviour of the rock salt and the clay layer has been determined. After excavation of the main room and different drifts the calculations have been continued over 100 years. The benchmark results and the comparison of several results with in situ measurements have shown that the numerical model is able to describe the main behaviour of the rock salt such as transient and steady-state creep, dilatancy and material damage around underground openings. A comparison of calculation results from five project partners was performed in a number of papers [1,6]. References 1 A. Hampel, R.-M. Günther, K. Salzer, R.-M. Günther, W. Minkley, A. Pudewills, B. Leuger, D. Zapf, K. Staudtmeister, R. Rokahr, K. Herchen, R. Wolters, K.-H. Lux, O. Schulze, U. Heemann, U. Hunsche, "Bencharking of Geomechanical Constitutive Models for Rock Salt", Proc. 44th US Rock Mechanics Symposium (ARMA 2010), Salt Lake City/Utah/USA, 27-30.06.2010, American Rock Mechanics Association (ARMA), 2010. 2 Adina R & D Inc., ADINA (Automatic Dynamic Incremental Nonlinear Analysis), Report ARD 01-9, Watertown, MA, US, 2010. 3 A. Pudewills, "Numerical modelling of the long-term evolution of EDZ; development of material models, implementation in finite-element codes and validation", FZKA-7185, Karlsruhe, Forschungszentrum Karlsruhe, 2005. 4 IFG, "Langzeitsicherheitsnachweis Grube Teutschenthal, Fortschreibung unter besonderer Berücksichtigung eines Sicherungs- und Verwahrungskonzeptes für das Grubenfeld Angersdorf", Institut für Gebirgsmechanik GmbH, Leipzig, 16.01. 2006. 5 O. Schulze, U. Heemann, U. Zetsche, A. Hampel, A. Pudewills, R.-M. Günther, W. Minkley, K. Salzer, Z. Hou, R. Wolters, R. Rokahr, D. Zapf, "Comparison of advanced constitutive models for the mechanical behavior of rock salt - results from a joint research project, I. Modeling of deformation processes and benchmark calculations", in K.H. Lux, W. Minkley, M. Wallner, H.R. Hardy, Jr., (Editors), "Proc. of the Sixth Conf. on the Mechanical Behavior of Salt (Saltmech 6)", Basic and Applied Salt Mechanics, Hannover, Taylor & Francis (Balkema), London, 77-88, 2007. 6 A. Hampel, K. Salzer, R.-M.Günther, W. Minkley, A. Pudewills, B. Leuger, D. Zapf, R. Rokahr, K.D. Herchen, R. Wolters, U. Düsterloh, "Joint Projects on the Comparison of Constitutive Models for the Mechanical Behavior of Rock Salt - II. Overview of the models and results of 3-D benchmark calculations", Proc. of the 7th Conference on Mechanical Behavior of Salt, Paris, 16-19.04, submitted for publication, 2012. doi:10.1201/b12041-33 purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £50 +P&P)
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