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Interface Friction Angle Soil-on-Steel from Ring Shear Tests on Offshore North Sea Sands

机译:海上北海砂环剪切试验的钢界面土壤摩擦角

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The Bishop Ring Shear (RS) apparatus is typically used to obtain interface residual friction angles (δ_(res)) of marine sands for design of either axial pile capacity after the ICP-method or pipeline design at shallow depths. Past research studies have proposed either a fixed value of δ_(res) = 29° for pile design, or correlations between δ_(res) and the mean particle size (D_(50)). In current design practice δ_(res) is mostly assumed to be equal to 29° and RS tests are only performed to clarify whether δ_(res) can be increased or not. This paper presents a database of RS-tests on offshore North Sea sands that suggest that δ_(res) could be stress dependent when the vertical effective stresses are less than 50 kPa, while the fines content are of secondary importance. Moreover, δ_(res) is affected by the roughness of the chosen steel interface and D_(50), but the effective stresses effects can also be predominant. The aim of this paper is to assist practitioners with the evaluation of a realistic value of δ_(res) for the design of offshore infrastructure in North Sea type of sands.
机译:Bishop环形剪切(RS)装置通常用于获得海砂的界面残余摩擦角(δ_(res)),以用于采用ICP方法设计轴向桩容量或采用浅深度的管道设计。过去的研究提出要么为桩设计提供固定值δ_(res)= 29°,要么提出δ_(res)与平均粒径之间的相关性(D_(50))。在当前的设计实践中,大多数假定δ_(res)等于29°,并且仅执行RS测试以阐明是否可以增加δ_(res)。本文介绍了北海近海砂岩RS测试的数据库,该数据库表明,当垂直有效应力小于50 kPa时,δ_(res)可能与应力有关,而细粉含量次要。此外,δ_(res)受所选钢界面的粗糙度和D_(50)的影响,但有效应力影响也可能占主导。本文的目的是协助从业人员评估δ_(res)的实际值,以设计北海型砂的海上基础设施。

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