Soil Creep As A Rate Process

A Geomechanical Model for Gas Hydrate Bearing Sediments Incorporating High Dilatancy, Temperature, and Rate Effects

“…The time-dependent behavior of soils has been investigated for a long time. Particular emphasis has been placed in the understanding of creep phenomena in soils (e.g., [97][98][99]). The impact of strain-rate on shear behavior of soils has also been intensively studied (e.g., [100][101][102][103]).…”

Διερεύνηση Της Μη-Γραμμικής Συμπεριφοράς Των Εδαφικών Υλικών Με Προσομοίωση Του Ερπυσμού

“…A careful examination of the expression above (expression (2.7)) reveals a significant shortcoming once the stress level D drops below 0.1. In this end, Mitchell et al (1968) published a slight modification of the original formulation (2.7). The modification was proposed rather to extend the validity in regions closer to null values of the shear stress level than to account for higher stress intensity levels that could potentially lead to creep failure (Aristorenas, 1992).…”

“…Sheahan et al (1996) and Yin and Cheng (2006) investigated the strain-rate dependent behavior of K 0 consolidated specimens in the triaxial apparatus assuming undrained conditions. By further accounting for the Mitchell et al' (1968) experiments addressing the undrained time-dependent behavior of remolded illite, remolded San Francisco Bay Mud and a Kaolinite-Sand mixture in the triaxial apparatus it becomes evident that the majority of experimental results on clays refer to undrained boundary conditions. Many researchers (i.e.…”

“…Many researchers (i.e. Mitchell et al, 1968;Vaid and Campanella, 1977;Karstunen et al, 2013;Sivasithamparam et al, 2013;Yin et al, 2010) imposed Constant Strain Rate loading regarding such process as characteristic of creep behavior. Regardless, whether the effect of constant strain rate loading affects the soil strength it is not characteristic of pure creep and should not be employed to clarify the elemental mechanisms associated with the time-dependent mechanical behavior.…”

A laboratory study of dilatant hardening: a mechanism for slow shear of granular materials

“…The Coulomb-Terzaghi equation, however, is simply a yield criterion and does not prescribe the manner in which deformation will progress after yield occurs. As a result, modelers occasionally postulate viscous components (Savage and Chleborad, 1982;Boulton and Hindmarsh, 1987), appeal to thermodynamic analogs (rate-process creep of Mitchell et al, 1968;Feda, 1989), or call on slightly rate-dependent friction (e.g., Dieterich, 1981;Marone et al, 1990) in order to explain post-yield strain rates. Making such assumptions is not only unsatisfying academically but can lead to inaccurate hazard assessment and misleading conclusions.…”