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

Schulze, Otto; Heemann, U.; Zetsche, F.; Hampel, A.; Pudewills, A.; Günther, R.-M.; Minkley, W.; Salzer, K.; Zhong-jie, Hou; Wolters, Ralf; Rokahr, R.; Zapf, D.

doi:10.1201/9781315106502-10

Cited by 3 publications

(4 citation statements)

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“…The results show that the considered models accurately describe transient and steady-state creep, evolution of damage and dilatancy and its impact on deformation, damage reduction and healing, creep failure and short-term strength, post-failure behavior and residual strength, all in a wide range of stress states, temperatures, and strain rates (Schulze et al 2007;Salzer et al 2012;Hampel et al 2012;Salzer et al 2015;Reedlunn 2018). The studies also identified the following topics in need of further investigation:…”

Section: Discussionmentioning

confidence: 86%

“…Within this series of joint projects, the first two projects focused on the investigation of basic deformation phenomena under various influences, e.g. transient and steady-state creep, damage-induced creep and dilatancy evolution, short-term strength and creep failure, post-failure behavior (Schulze et al 2007;Hou et al 2007;. Joint project III was a US-German collaboration in which selected benchmark calculations were performed to check and compare the various modeling approaches of the partners regarding the ability to describe the temperature influence on deformation as well as first approaches for the modeling of damage reduction and healing behavior of rock salt Salzer et al 2015;.…”

Section: Introductionmentioning

confidence: 99%

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The Mechanical Behavior of Salt X

Bresser¹,

Drury²,

Fokker³

et al. 2022

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Cover illustration: Microstructure of naturally deformed rock salt from the Avery Island salt dome, Louisiana, U.S.A. (images contributed by C.J. Spiers).The gold-colored image (long-side scale ~0.8 mm) is a �� light micrograph of a polished and etched section showing the internal subgrain structure within a single salt grain in the rock. The subgrains plus ��= stress vs. subgrain size relations for salt indicate that deformation involved a component of dislocation creep at a deviatoric stress around 1 MPa.The blue image (long-side scale 3 mm) is a transmitted light micrograph of a thin section of Avery Island salt that was g-irradiated to reveal the internal microstructure through radiation damage (precipitation of sodium nano-particles). The section shows evidence for both subgrains and asymmetric crystal overgrowth features (clear zones), suggesting that deformation involved not only dislocation creep but also dissolution-precipitation processes, such as grain boundary migration and/or pressure solution.All papers published in this volume were peer-reviewed before publication. Original papers and original reviews of previous work were accepted. The Organizing Committee is not responsible for the statements made or for the opinions expressed in this volume.

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Section: Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

The Mechanical Behavior of Salt X

Bresser¹,

Drury²,

Fokker³

et al. 2022

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“…Предложенная модель, в сравнении с другими распространенными моделями реологического поведения соляных пород, соответствует модели Минкли [8,9], сохраняя ее основные преимущества и недостатки. Следует подчеркнуть, что некоторые проблемы, касающиеся учета эффекта дилатансии в модели, могут быть исправлены, например, путем введения дополнительных уточненных нелинейных зависимостей угла дилатансии от напряжений в используемую зависимость от эффективных пластических деформаций [18].…”

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Determination and verification of the calculated model parameters of salt rocks taking into account softening and plastic flow

Kozlovskiy

Журавков

2021

PMI

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The article suggests using a combination of the modified Burgers model and the Mohr – Coulomb model with the degradation of the adhesion coefficient and the increase in the friction coefficient to determine the parameters of salt rocks. A comparative analysis of long-term laboratory tests and field observations in underground mine workings with the results obtained using a calculated model with certain parameters is carried out. The parameters of the Mohr – Coulomb model with the degradation of the adhesion coefficient and the increase in the friction coefficient were obtained from the statistically processed data of laboratory tests, and the parameters of the modified Burgers model were determined. Using numerical methods, virtual (computer) axisymmetric triaxial tests, both instantaneous and long-term, were performed on the basis of the proposed model with selected parameters. A model problem is solved for comparing the behavior of the model with the data of observation stations in underground mine workings obtained from borehole rod extensometers and contour deformation marks. The analytically obtained coefficients of the nonlinear viscous element of the modified Burgers model for all the analyzed salt rocks did not need to be corrected based on the monitoring results. At the same time, optimization was required for the viscoelastic element coefficients for all the considered rocks. The analysis of the model studies showed a satisfactory convergence with the data on the observation stations. The comparative analysis carried out on the models based on laboratory tests and observations in the workings indicates the correct determination of the parameters for salt rocks and the verification of the model in general.

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“…A new viscoplastic constitutive model for rock salt that can describe the volumetric strain (dilatancy) and the damage of the rock has been proposed and implemented in this code [5]. The model parameters for the numerical simulation have been evaluated on the available laboratory experiments [3,6]. The Angersdorf salt mine consists of a regular pattern of large rooms and pillars at a depth of about 530 m. Therefore, a 3D vertical section was chosen as a representative model.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Long-Term Behaviour of an Underground Structure in Rock Salt

Pudewills¹

Proceedings of the Eighth International Conference on Engineering Computational Technology

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This paper summarizes the current state of numerical simulations of long-term geomechanical behaviour of an existing salt mine. Within the frame of a national joint project, five participants performed benchmark like calculations on a 3D underground structure. The main objective of the project was to evaluate the ability of the different models to correctly describe the relevant deformation phenomena in rock salt under various influences. In the first step of the benchmark calculations, the initial state of stress taking into account the creep behaviour of the rock salt and an intercalating clay layer has been determined. After excavation of the main room and different drifts the calculations have been continued over 100 years. Finally, the numerical results and in situ measurements are compared.

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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

Cited by 3 publications

References 1 publication

The Mechanical Behavior of Salt X

The Mechanical Behavior of Salt X

Determination and verification of the calculated model parameters of salt rocks taking into account softening and plastic flow

Simulation of the Long-Term Behaviour of an Underground Structure in Rock Salt

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