Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Chemical Degradation and Compaction Instabilities in Geomaterials
During compaction band formation various mechanisms can be involved at different scales. Mechanical and chemical degradation of the grain skeleton and grain crushing are important factors that may trigger instabilities in the form of compaction bands. Compaction bands can be seen as an instability of the underneath mathematical problem leading to localization of deformation. Here we explore the conditions of compaction banding in quartz-based geomaterials by considering the effect of chemical dissolution. As the stresses/deformations evolve the grains of the geomaterial break into smaller ones. As a result, the total available surface of the grains is increased, their dissolution is accelerated and chemical softening is triggered. By accounting for (a) the mass diffusion of the system, (b) a macroscopic failure criterion with dissolution softening and (c) the reaction kinetics at the micro level, a model is proposed and the conditions for compaction instabilities are investigated.
Chemical Degradation and Compaction Instabilities in Geomaterials
During compaction band formation various mechanisms can be involved at different scales. Mechanical and chemical degradation of the grain skeleton and grain crushing are important factors that may trigger instabilities in the form of compaction bands. Compaction bands can be seen as an instability of the underneath mathematical problem leading to localization of deformation. Here we explore the conditions of compaction banding in quartz-based geomaterials by considering the effect of chemical dissolution. As the stresses/deformations evolve the grains of the geomaterial break into smaller ones. As a result, the total available surface of the grains is increased, their dissolution is accelerated and chemical softening is triggered. By accounting for (a) the mass diffusion of the system, (b) a macroscopic failure criterion with dissolution softening and (c) the reaction kinetics at the micro level, a model is proposed and the conditions for compaction instabilities are investigated.
Chemical Degradation and Compaction Instabilities in Geomaterials
Stefanou, I. (Autor:in) / Sulem, J. (Autor:in)
Fifth Biot Conference on Poromechanics ; 2013 ; Vienna, Austria
Poromechanics V ; 397-406
18.06.2013
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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