Effects of soil structure on soil behaviour: Illustrated with loess, glacially loaded clay and simulated flaser bedding examples
Effects of soil structure on soil behaviour: Illustrated with loess, glacially loaded clay and simulated flaser bedding examples
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DOI：
10.1016/j.enggeo.2006.12.011
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发表时间：
2007-04
影响因子：
7.4
通讯作者：
G. Kruse;T. Dijkstra;F. Schokking
中科院分区：
文献类型：
--
作者：
G. Kruse;T. Dijkstra;F. Schokking
土壤结构性是指土壤性质和条件的系统性、均匀性、重复性、非均匀性。为了提高和均匀化的性质和条件，有必要了解土壤结构发生的方式，并了解它影响土壤行为的方式。通过三个实例，讨论了土力学中土结构性影响的不同方面。黄土沉积物的非常松散的颗粒尺度堆积，通过颗粒之间的弱结构键结合在一起，当变形超过键的强度时，导致急剧的扩展破坏，如第一种情况所示。在移动的大陆冰盖下的地下引起的非水平应力导致受影响的土壤内的旋转应力场。旋转应力场储存在土壤的结构中，如第二种情况所示，并影响这些粘土的当今性质和行为。在第三种情况下，粘土砂的行为有很大的差异，这取决于粘土是否以普通粘土flasers的形式出现，或者粘土是否均匀地分散在砂中。由于构成沉积结构的材料性质的巨大差异，在砂与粘土混合的情况下，变形和应力传播导致局部破坏和剪切面。其结果是，许多性质的沙子与flasers更像粘土的flasers比沙子。在工程实践中纳入常见类型的土壤结构的影响是可能的技术，如数值模拟的广泛应用。这些技术使得能够为实际应用开发适当的工具。
Soil structure is considered to be a systematic homogeneously repetitive heterogeneity of properties and conditions of soil. For upscaling and homogenisation of properties and conditions it is necessary to understand the ways in which soil structures occur, and to obtain understanding of the ways in which it influences soil behaviour. Using three case studies, different aspects of the effects of soil structure in soil mechanics are discussed. The very loose grain scale packing of loess deposits, held together by weak structural bonds between particles, results in dramatic propagating failure when the strength of the bonds is exceeded by deformations, as illustrated in the first case. Nonhorizontal stresses induced in the subsurface below moving continental ice sheets result in rotated stress fields within the affected soil. The rotated stress field is stored in the structure of the soil, as is shown in the second case, and influences present day properties and behaviour of these clays. It is shown in the third case that there is a large difference in the behaviour of clayey sand depending on whether the clay occurs in the form of the common clay flasers or whether the clay is homogeneously dispersed in the sand. The deformation and stress propagation in the case of sand with clay flasers results in local failures and shear planes due to the large contrast in the properties of the materials making up the sedimentary structure. The result is that many of the properties of sand with flasers are rather more like the clay of the flasers than the sand. Incorporation in the engineering practice of effects of common types of soil structure is made possible with the widespread availability of techniques such as numerical modelling. These techniques enable the development of appropriate tools for practical application.