On acoustic reflection from sand-sized water-saturated granular media at MHz frequencies: Measurements, models and the role of speckle

2020 ◽  
Vol 148 (5) ◽  
pp. 3291-3304
Author(s):  
Jenna Hare ◽  
Alex E. Hay
Keyword(s):  
Granular Media ◽  
Acoustic Reflection ◽  
Water Saturated

Role of contact couples and couple stress in the behaviour of granular media

1998 ◽  
Vol 08 (PR8) ◽  
pp. Pr8-87-Pr8-94
Author(s):  
F. Dedecker ◽  
Ph. Dubujet ◽  
B. Cambou
Keyword(s):  
Couple Stress ◽  
Granular Media

Tunnel excavation in granular media: the role of force chains

2021 ◽  
Vol 23 (4) ◽  
Author(s):  
Raj Kumar Pal ◽  
Robert Buraque de Macedo ◽  
José E Andrade
Keyword(s):  
Granular Media ◽  
Force Chains ◽  
Tunnel Excavation

Co-transport of U(VI) and akaganéite colloids in water-saturated porous media: Role of U(VI) concentration, pH and ionic strength

2018 ◽  
Vol 147 ◽  
pp. 350-361 ◽  
Author(s):  
Mengtuan Ge ◽  
Dengjun Wang ◽  
Junwei Yang ◽  
Qiang Jin ◽  
Zongyuan Chen ◽  
...  
Keyword(s):  
Porous Media ◽  
Ionic Strength ◽  
Saturated Porous Media ◽  
Water Saturated

scholarly journals Rayleigh Waves Transformation in Liquefying Water-saturated Sands

2016 ◽  
Vol 63 (2-3) ◽  
pp. 173-190
Author(s):  
Ryszard Staroszczyk
Keyword(s):  
Rayleigh Waves ◽  
Granular Media ◽  
Ground Motions ◽  
Soil Liquefaction ◽  
Saturated Sand ◽  
Rayleigh Surface Waves ◽  
Pore Pressures ◽  
Sand Deposit ◽  
Water Saturated ◽  
Excess Pore Pressures

AbstractThe behaviour of a water-saturated sand deposit subjected to dynamic loads induced by the propagation of Rayleigh surface waves is analysed. Cyclic shearing of the saturated sand matrix due to ground motions results in the development of excess pore pressures in the soil and its subsequent liquefaction. The phenomena of pore pressure generation and soil liquefaction are investigated within the framework of a compaction theory for saturated granular media. The results of calculations, carried out by a finite-element method, illustrate the evolution of pore pressures and the development of liquefaction zones in the soil, and show the variation of surface wave parameters with the progressive degradation of the strength of the subsoil.

scholarly journals Continuum Modeling of Granular Media

2014 ◽  
Vol 66 (5) ◽  
Author(s):  
J. D. Goddard
Keyword(s):  
Granular Flow ◽  
Granular Media ◽  
Evolution Equations ◽  
Particle Migration ◽  
Internal Variables ◽  
Continuum Modeling ◽  
Material Instability ◽  
Rapid Flow ◽  
Internal Balance

This is a survey of the interesting phenomenology and the prominent regimes of granular flow, followed by a unified mathematical synthesis of continuum modeling. The unification is achieved by means of “parametric” viscoelasticity and hypoplasticity based on elastic and inelastic potentials. Fully nonlinear, anisotropic viscoelastoplastic models are achieved by expressing potentials as functions of the joint isotropic invariants of kinematic and structural tensors. These take on the role of evolutionary parameters or “internal variables,” whose evolution equations are derived from the internal balance of generalized forces. The resulting continuum models encompass most of the mechanical constitutive equations currently employed for granular media. Moreover, these models are readily modified to include Cosserat and other multipolar effects. Several outstanding questions are identified as to the contribution of parameter evolution to dissipation; the distinction between quasielastic and inelastic models of material instability; and the role of multipolar effects in material instability, dense rapid flow, and particle migration phenomena.

Role of pH in partitioning and cation exchange of aromatic amines on water-saturated soils

Chemosphere ◽  
2001 ◽  
Vol 44 (4) ◽  
pp. 627-635 ◽  
Author(s):  
Hui Li ◽  
Linda S Lee ◽  
Jose R Fabrega ◽  
Chad T Jafvert
Keyword(s):  
Cation Exchange ◽  
Aromatic Amines ◽  
Saturated Soils ◽  
Water Saturated
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