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This paper presents a review of the general state of the art in the understanding of the interaction between water and pit slope deformations. The topics covered include; the theory of  hydromechanical coupling, the interaction between stress and pore fluid responses for rock structure and rock masses and the impacts of these on open pit slopes. The hydrogeological cycle for an open pit is explained and the importance of transient and partial pore pressures are highlighted. The paper includes an explanation of pit slope deformations and failure movements. A new system for classifying pit slope movements is presented together with critical movement thresholds.The various methods for slope depressurisation are addressed and the accuracy and methodology for assessing pore pressure input to slope design at all slope scales are reviewed.

Slope Stability 2007 — Y. Potvin (ed), Australian Centre for Geomechanics, Perth, ISBN 978-0-9756756-8-7
Pells Sullivan Meynink Pty Ltd, Australia Adjunct Professor of Civil Engineering, University of NSW
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