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Katsigiannis, G. (author), Schweiger, H.F. (author), Ferreira, P. (author), Fuentes, R. (author)This paper focuses on the derivation of design prop loads for supported excavations in stiff clay with increasing excavation depth and number of prop levels. For multi-propped walls there are a number of empirical graphs to obtain the design prop forces. CIRIA C517 (Twine & Roscoe, 1999) enhancing Terzaghi & Peck's work (Terzaghi & Peck (1967)...conference paper 2015