Numerical Methods in Geotechnical Engineering IX : PROCEEDINGS OF THE 9TH EUROPEAN CONFERENCE ON NUMERICAL METHODS IN GEOTECHNICAL ENGINEERING (NUMGE 2018), June 25-27 2018, Porto,... by European Conference on Numerical Methods in Geotechnical Engineering (9th : 2018 : Porto, Portugal), Cardoso, Antn̤io S., editor, Borges, Jos Ľ., editor, Costa, Pedro A., editor, Gomes, Antn̤io T., editor, Marques, Jos Č., editor, Vieira, Castorina S., editor