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Santana, T., Vicente M. da Silva, Nunes A. Ant\'e3o, and N. M. C. Guerra \i Two dimensional upper and lower-bound numerical analysis of the basal stability of deep excavations in clay\i0 . Pro eedings of the 9 th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE 2018). Porto, 2018.\par \par }