A study of the dissipative behavior of geomaterials undergoing large deformations

摘要9987677了解土、岩等岩土材料的响应对于解决岩土工程、环境工程、交通运输、建筑和施工技术等领域的各种问题至关重要。试图描述这种材料的响应是经典塑性和混合理论的改编。最近，已经开发了一个通用框架来研究聚合物网络中的各种耗散过程，如滑移、孪晶、相变和损伤。这个奖项的目的是进一步推广理论，包括岩土材料的耗散响应。该理论的主要特点是：它考虑到许多材料可以以一种以上的自然形态存在，并且在给定的时刻，响应由所有这些形态的变形梯度决定，使材料具有混合特性；当这些材料经历耗散过程时，潜在的自然构型总是会发生变化；自然构型的演化一般是由热力学准则决定的；该材料具有多种储存能量的方式；如果满足某些热力学标准，则可以激活不同类型的响应；一旦某个特定的机制被激活，可能就有必要规定该机制的进化过程。

Abstract9987677The understanding of the response of geomaterials such as soils and rocks is crucial in addressing a variety of problems in geotechnical engineering, environmental engineering, transportation, building and construction technology. Attempts to describe the response of such materials are adaptations of classical plasticity and mixture theory. Recently, a general framework has been developed to study a diverse class of dissipative processes such as slip, twinning, phase transition, and damage in polymer networks. The objective of this award is to generalize the theory further to include the dissipative response of geomaterials.The main features of the theory are: it takes into account the fact that many materials can exist in more than one natural configuration and that, at a given instant, the response is determined by the deformation gradient from all these configurations, giving the material its mixture-like characteristics; when these materials undergo dissipative processes, the underlying natural configurations invariably change; the evolution of the natural configurations is determined in general by a thermodynamic criterion; the material has various means of storing energy; different types of response can be activated if certain thermodynamic criteria are met; and once a particular mechanism is activated, it might be necessary to prescribe the evolution for the mechanism.