Shear-zone geometries in experimentally deformed clays: the influence of water content, strain rate and primary fabric
Shear-zone geometries in experimentally deformed clays: the influence of water content, strain rate and primary fabric
复制标题
实验变形粘土中的剪切带几何形状：含水量、应变率和原生结构的影响
DOI：
10.1016/0191-8141(88)90131-9
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发表时间：
1988
影响因子：
3.1
通讯作者：
R. Knipe
中科院分区：
文献类型：
--
作者：
J. Arch;A. Maltman;R. Knipe
在实验变形的粘土中，影响剪切带几何形状的三个参数是含水量、应变速率和相对于任何原始结构的剪切带方向。剪切带是试验条件下（含水量为20 ~ 35% w/w、应变率为10−4 ~ 10−8s−1的三轴压缩条件下）粘土中主要的微观结构。含水量的微小变化会显著改变剪切带的外观：湿润沉积物中的结构比干燥沉积物中的结构更复杂，数量更多，而干燥沉积物往往会产生少量离散的平面剪切带。应变速率对剪切区几何形状的影响要小得多。相对于主要织物的区域方向也很重要。与织物平行的剪切区比与织物以高角度相交的剪切区具有更简单的几何形状。这些因素的知识可能有助于解释剪切带在自然变形的软沉积物中形成的条件。
In experimentally deformed clays, three parameters which influence the geometry of shear zones are water content, strain rate and the orientation of the shear zones with respect to any primary fabric. The shear zones are the main microstructures induced in the clays within the experimental conditions (triaxial compression at water contents between 20 and 35% w/w and strain rates between 10−4and 10−8s−1). Small changes in water content produce a significant change in the appearance of shear zones: structures in wetter sediments are more complex and more numerous than those in drier sediments which tend to produce a small number of discrete planar shear zones. Strain rate is a far less important influence on shear-zone geometry. The orientation of the zones with respect to a primary fabric is also significant. Shear zones which are parallel to the fabric have a simpler geometry than zones which intersect the fabric at a high angle. Knowledge of these factors may help interpret the conditions within which shear zones formed in naturally-deformed soft sediments.