Abstract
AbstractSafety assessments in nuclear waste management typically include the analysis of thermo-mechanical (TM)-coupled processes. The TM behavior of the host rock is, among other aspects, dependent on the prevalent geological geometry. This study aims to evaluate the impact of uncertainties in geometry on the TM rock behavior. It is one of the very first studies aiming to bring uncertainties of structural geological models and numerical simulations together. To analyze the influence of geological geometries, a simplified model of the region around the Mont Terri rock laboratory was created. A 3D structural geological model was set up and uncertainties of the lithological contacts were quantified by means of stochastic simulations, resulting in an ensemble of 89 model realizations. These realizations were transformed to a 2D numerical model. In this numerical model, TM simulations were computed over a simulation time of 500 years, employing the Finite Element Method. To simulate a heat source of nuclear waste, the lower edge of the model was set to 100 °C. The results of these simulations show mean temperature variations of 90.89 and 92.70 °C after 500 years, with a maximum stress varying between 0.02 and 0.16 MPa of elastic shear energy density and according mean cumulative displacements ranging from 30 to 38 cm. The presented results indicate that different model geometries and differences in material properties lead to noticeable variabilities of the TM behavior of claystone. However, in this case, these variabilities would not significantly affect the integrity of the rock.
Funder
BGE Bundesgesellschaft für Endlagerung mbH
Publisher
Springer Science and Business Media LLC
Subject
Earth-Surface Processes,Geology,Pollution,Soil Science,Water Science and Technology,Environmental Chemistry,Global and Planetary Change
Reference27 articles.
1. Alberty J, Carstensen C, Funken SA (1999) Remarks around 50 lines of Matlab: short finite element implementation. Numer Algorithms 20:117–137
2. Alberty J, Carstensen C, Funken SA, Klose R (2002) Matlab implementation of the finite element method in elasticity. Computing 69:239–263. https://doi.org/10.1007/s00607-002-1459-8
3. BGE (2020) Zwischenbericht Teilgebiete gemäß § 13 StandAG. 28.09.2020. Bundesgesellschaft für Endlagerung mbH
4. Birkholzer JT, Tsang C-F, Bond AE, Hudson JA, Jing L, Stephansson O (2019) 25 years of DECOVALEX - Scientific advances and lessons learned from an international research collaboration in coupled subsurface processes. Int J Rock Mech Min Sci. https://doi.org/10.1016/j.ijrmms.2019.03.015
5. Bossart P, Thury M (2008) Mont Terri Rock laboratory. Project, programme 1996 to 2007 and results. Swiss Geological Survey, Wabern
Cited by
5 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献