Critical state friction angle of sands
Critical state friction angle of sands
复制标题
DOI：
10.1680/geot.9.p.090
复制
发表时间：
2011-09
期刊：
影响因子：
5.8
通讯作者：
A. Sadrekarimi;S. Olson
中科院分区：
文献类型：
--
作者：
A. Sadrekarimi;S. Olson
摩擦角是分析砂土对荷载响应最重要的参数。然而，其随应力水平、织物和颗粒损伤的变化一直存在争议。通过三轴压缩和环剪试验，研究了三种砂土的屈服角和临界状态摩擦角。仅使用收缩响应来定义屈服摩擦角和三轴试验的临界状态摩擦角。而在环剪试验中，不论是收缩试件还是膨胀试件（通过颗粒损伤）都达到了临界状态，因此不论是致密试件还是松散试件都定义了临界状态摩擦角。屈服摩擦角受初始砂构的影响，随预剪孔隙比的增大而减小。相比之下，环剪试验的临界状态摩擦角与本文分析的应力路径无关，与初始砂结构无关，仅随着应力水平的变化而略有下降，变得至关重要。
The friction angle is the most important parameter used for analysing the response of sands to loading. However, its variation with stress level, fabric and particle damage has been debated. This study examines the yield and critical state friction angles of three sands using triaxial compression and ring shear tests. Only contractive responses were used to define the yield friction angles and the critical state friction angles from the triaxial tests. However, both contractive and dilative (through particle damage) specimens reached a critical state in the ring shear tests, and therefore critical state friction angles were defined from both dense and loose specimens. The yield friction angle was affected by the initial sand fabric, decreasing as the pre-shear void ratio increased. In contrast, the critical state friction angle from the ring shear tests was independent of stress paths analysed in this paper, independent of initial sand fabric, and decreased only slightly with stress level, becoming essent...