Large-displacement interface shear between steel and granular media
Large-displacement interface shear between steel and granular media
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DOI：
10.1680/geot.8.p.086
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发表时间：
2011-03
期刊：
影响因子：
5.8
通讯作者：
R. Jardine;N. Anh-Minh
中科院分区：
文献类型：
--
作者：
R. Jardine;N. Anh-Minh
本文系统地研究了级配硅砂和硅石粉粉土在钢界面上的剪切行为。环剪试验研究了界面位置、位移尺度、正应力水平和颗粒粒径分布对极限界面摩擦角δ ′ cv的影响。颗粒破碎在集中剪切带中起着重要作用，这一过程沿着界面粗糙度的变化，可能导致δ′值与常规小位移直剪试验中的δ′值有显著差异。它还表明，δ′测量在较小的位移可能取决于是否接口是安装在上方或下方的样品，但这种差异时，位移是大的减少到零。δ′在一毫米到几米尺度上与位移有很强的相关性，这一发现具有许多实际的岩土工程意义。
A systematic study is reported of the behaviour of graded silica sands and a silica rock flour silt, sheared against steel interfaces. Ring shear experiments investigated the influences of interface position, displacement scale, normal stress level and particle size distribution on ultimate interface friction angle, δ ′ cv . Grain crushing is shown to play an important role within a concentrated shear zone, and this process, along with changes in the roughness of the interface, could lead to δ′ values markedly different from those developed in conventional small-displacement direct shear tests. It is also shown that δ′ measurements at smaller displacements may depend on whether the interface is mounted above or below the sample, but that such differences diminish to zero when displacements are large. The finding that δ′ is strongly displacement-dependent over the single-millimetre to multiple-metre scale has many practical geotechnical engineering implications.