A mechanism of instability of geomaterials in compression is proposed based on the phenomenon of transitional negative stiffness associated with the process of crack/fracture formation. This phenomenon acts only for a very short time as the fracture is being formed. The negative stiffness cracks increase the Poisson’s ratio and thus are capable of making nearly incompressible material elastically unstable. A geomaterial can reach the limiting value of the incremental Poisson’s ratio due to dilatancy observed in compression. While dilatancy is a non-linear phenomenon, incrementally, at the time of fracture formation it is elastic and hence can be made unstable by the transitional negative stiffness. © Springer International Publishing AG 2017.
|Name||Springer Series in Geomechanics and geoengineering|
|Conference||11th International Workshop on Bifurcation and Degradation in Geomaterials |
|Period||21/05/17 → 25/05/17|