The concept of stored plastic work or frozen elastic energy in soil mechanics
The concept of stored plastic work or frozen elastic energy in soil mechanics
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DOI：
10.1680/geot.55.5.373.66023
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发表时间：
2005-06-01
期刊：
影响因子：
5.8
通讯作者：
Collins, IF
中科院分区：
文献类型：
--
作者：
Collins, IF
本文是一系列文章的一部分，旨在系统地探索现代热力学理论在土壤和其他地质材料本构建模中的应用。尽管在单晶粒水平上将施加的功划分为可恢复的弹性能和不可恢复的塑性能是很简单的，但在连续体水平上却并非如此。由于微观层面上应力和变形场的高度异质性，一些微观层面的弹性能被“冻结”，因此一些施加的塑性功被存储并可恢复。这个概念在微观层面、力链的中观层面和连续体层面进行了解释。它还通过示意性弹簧滑块模型进行了解释。这些想法对于连续体水平的本构建模具有非常重要的影响。特别是，它表明土壤膨胀有两种原因，一种是由于雷诺膨胀，另一种是由于冻结能量（或储存的塑性功）的恢复。这对临界状态的概念具有重大影响。指出了对未来研究的影响。
This paper is part of a series that aims to explore systematically the applications of the modern theory of thermomechanics to the constitutive modelling of soils and other geomaterials. Although the division of the applied work into recoverable elastic energy and irrecoverable plastic energy is straightforward at the level of single grains, this is not true at the continuum level. Because of the highly heterogeneous nature of the stress and deformation fields at the micro level, some of the micro-level elastic energy is 'frozen', and consequently some of the applied plastic work is stored and is recoverable. The concept is explained at the micro level, at the meso level of the force chains, and at the continuum level. It is also explained in terms of a schematic spring-slider model. These ideas have very important ramifications for constitutive modelling at the continuum level. In particular it is shown that there are two causes for dilation in a soil, one due to Reynolds' dilatancy, the other due to the recovery of the frozen energy (or stored plastic work). This has significant consequences for the concept of critical states. Implications for future research are indicated.