laboratory data, which relate the liquefaction resistance of firoozkooh sand and non-plastic silt mixtures to shear wave velocity are presented and compared to liquefaction criteria derived from seismic field measurements by andrus and stokoe [1]. in the work described herein, cyclic triaxial and resonant column tests were conducted on specimens of clean sand and sand-silt mixtures with silt co...

On the basis of plastic bounding surface model, the damage theory for structured soils and unsaturated soil mechanics, an elastoplastic model for unsaturated loessic soils under cyclic loading has been elaborated. Firstly, the description of bond degradation in a damage framework is given, linking the damage of soil’s structure to the accumulated strain. The Barcelona Basic Model (BBM) was cons...

This study was aimed at highlighting the effect of loading frequency on sand liquefaction response by performing cyclic triaxial tests in both stress-controlled and strain-controlled modes. For first case, dense (IDmat = 0.70) medium-dense 0.55) specimens were subjected to alternative non-alternative axial stresses; whilst strain over a wide range frequencies second case. It experimentally foun...

Liquefaction susceptibility of river channel deposit in Kolkata city is studied using laboratory cyclic triaxial tests. River deposit, which supports a large part rapidly growing urbanization city, mainly consists sandy soil with little amount silt. Cyclic tests have been performed on this sample varying relative density, confining pressure, and strain amplitude. Results are presented to show h...

The prediction quality of discrete element method (DEM) models for railway ballast can be expected to depend on three points: the geometry representation of the single particles, the used contact models and the parametrisation using principal experiments. This works aims at a balanced approach, where none of the points is addressed with excessive depth. In a first step, a simple geometry repres...