A coupled hydro-mechanical creep damage model for clayey rock and its application to nuclear waste repository
By a News Reporter-Staff News Editor at Technology News Focus -- Researchers detail new data in Technology - Underground Space Technology. According to news reporting originating in Hubei, People’s Republic of China, by VerticalNews journalists, research stated, “In this paper we propose a new nonlinear elasto-viscoplastic damage model, based on a modified Mohr-Coulomb criterion, to study the creep and seepage in clayey rock during construction of a high-level radioactive waste repository through laboratory experiments and field tests. First, three types of damage evolution equations are constructed by using the relationship between the damage variable and the strain.”
Financial supporters for this research include Chinese Academy of Sciences, Natural Science Foundation of Hubei Province, National Natural Science Foundation of China.
The news reporters obtained a quote from the research from Yangtze University, “Then, a self-healing model is investigated for the clayey rock by considering the damage, confining pressure, pore water, and duration of saturated state. By introducing the damage, permeability evolution and self-healing as the key factors, a fully coupled hydro-mechanical model for clayey rock is developed with the commercial software ABAQUS. The hydro-mechanical behaviour in the surrounding rock is simulated with the proposed model considering the actual construction of the repository. The numerical results show that the construction quality has a significant effect on the stability of the rock formation, and that the extent of the horizontal gallery disturbed by shield tunnelling is less than that of the test drift disturbed by using jackhammers method. The creep damage of the surrounding rock increases rapidly at the early stage and tends to stabilize gradually after 15 years, and the damage in the middle part of the surrounding rock is larger than that in the bottom and top parts. In addition, due to the self-healing effect of clayey rock, around three years later, the permeability of the excavation disturbed zone (EDZ) is close to that of the original clayey rock with an order of magnitude 10(-19) m(2).”
According to the news reporters, the research concluded: “The present model can also be used to predict the long-term stability of tunnels.”
For more information on this research see: A coupled hydro-mechanical creep damage model for clayey rock and its application to nuclear waste repository. Tunnelling and Underground Space Technology , 2018;74():230-246. Tunnelling and Underground Space Technology can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier - www.elsevier.com; Tunnelling and Underground Space Technology - http://www.journals.elsevier.com/tunnelling-and-underground-space-technology/)
Our news correspondents report that additional information may be obtained by contacting S.P. Jia, Yangtze Univ, Res Center Geomech & Geotech Engn, Jingzhou 434023, Hubei, People’s Republic of China. Additional authors for this research include L.W. Zhang, B.S. Wu, H.D. Yu and J.X. Shu.
The direct object identifier (DOI) for that additional information is: https://doi.org/10.1016/j.tust.2018.01.026. This DOI is a link to an online electronic document that is either free or for purchase, and can be your direct source for a journal article and its citation.
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CITATION: (2018-04-11), Reports from Yangtze University Describe Recent Advances in Underground Space Technology (A coupled hydro-mechanical creep damage model for clayey rock and its application to nuclear waste repository), Technology News Focus, 612, ISSN: 0000-0000, BUTTER® ID: 015471288
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