Sammendrag
This paper presents a desktop study on the rockfill strength properties related to the subsea
rockfill, which is generally installed at a loose state and under low stress level compared with
its onshore counterparts. The rockfill properties are derived based on extensive review of
literature available in the public domain, together with our experience in geotechnical testing,
design and installation of rockfills. The focus of the present study is on the effective peak
internal friction angle, ϕ′p, of the rockfill, placed by the Fall Pipe installation method, by
considering its dependency on the stress level. Advice on other parameters, such as friction
angle at critical state, ϕ′cs, maximum dilation angle, ψmax, and rockfill submerged weight are
also provided. As consistently shown by the various datasets, ϕ′p and ψmax are dependent on
the stress level, while ϕ′cs is relatively constant for a given rock type. The simplified stressdilatancy
relationship is found also to be applicable to the sands, with minor adjustment due
to the difference between rockfills and sands. A case study is presented at the end to
demonstrate how the derived relationships can be applied for real designs.
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