PROBABILISTIC OPTIMUM DESIGN OF DRAINAGE PIPES ON SLOPE STABILITY

This paper discribes a reliability-based procedure for selecting a countermeasure against a failure of a slope. The type of failure considered in this paper is a sliding slope failure due to a ground water flow during dry-up operation of the graving dock. Firstly, a proposed countermeasure consists of a series of horizontal drainage pipes. Optimum design is selected among relevant alternatives with various horizontal drainage pipe spacings. A widely accepted criterion for optimum decision is the minimum expected cost, which directly incoporates qualitative evaluation of safety in terms of failure probability.