Large-displacement interface shear between steel and granular media

被引:94
作者
Ho, T. Y. K. [1 ]
Jardine, R. J. [2 ]
Anh-Minh, N.
机构
[1] Govt Hong Kong Special Adm Reg, Civil Engn & Dev Dept, Hong Kong, Hong Kong, Peoples R China
[2] Univ London Imperial Coll Sci Technol & Med, Dept Civil & Environm Engn, London SW7 2AZ, England
来源
GEOTECHNIQUE | 2011年 / 61卷 / 03期
基金
英国工程与自然科学研究理事会;
关键词
laboratory tests; piles; soil/structure interaction; FRICTION; SAND; APPARATUS; STRENGTH;
D O I
10.1680/geot.8.P.086
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
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, delta(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 delta' values markedly different from those developed in conventional small-displacement direct shear tests. It is also shown that delta' 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 delta' is strongly displacement-dependent over the single-millimetre to multiple-metre scale has many practical geotechnical engineering implications.
引用
收藏
页码:221 / 234
页数:14
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