An energy-based damage model of geomaterials—I. Formulation and numerical results

✍ Scribed by G. Swoboda; Q. Yang

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 725 KB
• Volume: 36
• Category: Article
• ISSN: 0020-7683
• DOI: 10.1016/s0020-7683(98)00036-5

✦ Synopsis

In this paper\ an anisotropic damage model is established in strain space to describe the behaviour of geomaterials under compression!dominated stress _elds[ The research work focuses on rate!independent and small!deformation behaviour during isothermal processes[ It is emphasized that the damage variables should be de_ned microstructurally rather than phenomenologically for geomaterials\ and a second!order {{fabric tensor|| is chosen as the damage variable[ Starting from it\ a one!parameter damage!dependent elasticity tensor is deduced based on tensorial algebra and thermodynamic requirements ^a fourth!order damage characteristic tensor\ which determines anisotropic damaging\ is deduced within the framework of Rice|s "0860# {{normality structure|| in Part II of this paper[ An equivalent state is developed to exclude the macroscopic stress:strain explicitly from the relevant constitutive equations[ Finally\ some numerical results are worked out to illustrate the mechanical behaviour of this model[ Þ 0887 Elsevier Science Ltd[ All rights reserved[