Image based local deformation measurement of saturated sand specimen in undrained cyclic triaxial tests

Simulation of Stress-Strain Behavior of Saturated Sand in Undrained Triaxial Tests Based on Genetic Adaptive Neural Networks

This study applies artificial neural networks (ANN) to simulate the soil stress-strain relationship observed in test data from triaxial shear testing of saturated sand. A genetic algorithm is used to obtain an optimal framework for the ANN. The results show that the proposed genetic adaptive neural network (GANN) can effectively model undrained monotonic and cyclic triaxial behaviour of saturat...

Stability of Undrained Deformation of Fluid-saturated Geo-materials

The presence of pore fluids in geomaterials can alter deformation processes and facilitate or delay material failure. Dilation/contraction of geomaterials in the course of inelastic undrained deformation causes a reduction/increase in pore pressure altering the effective compressive stress. This results in an increase/decrease in shear stress that can be sustained by the material over the corre...

An elasto-plastic model to describe the undrained cyclic behavior of saturated sand with initial static shear

With the aim of simulating the behavior of saturated sand with initial static shear (i.e., sloped ground) undergoing undrained cyclic loading, which leads to liquefaction and large cyclic shear strain development, an elastoplastic constitutive model which can describe both monotonic and cyclic torsional shear behaviors of saturated sand under drained and/or undrained conditions is presented. It...

Localization in Undrained Deformation

Exploiting form invariance of a class of elastic – plastic constitutive relations for drained and undrained deformation makes it possible to compare predictions for localization under these limiting conditions. Results are shown to depend strongly on poroelastic constants reflecting the compressibility of solid and fluid constituents and parameters describing inelastic volume strain and the dep...

Effect of Cementation on the Shear Strength of Tehran Gravelly Sand Using Triaxial Tests