Showing papers in "Soils and Foundations in 2008"

TL;DR: In this paper, the effect of fine content on critical state and liquefaction resistance of sand-silt mixtures was investigated for both undrained and drained monotonic and cyclic triaxial tests.

TL;DR: In this article, a series of cyclic triaxial tests of unsaturated soils was conducted to get a better understanding of the general liquefaction state of nonsaturated soils.

TL;DR: In this paper, the viscous properties of unbound and bound soils, in particular unbound granular materials, were evaluated by stepwise changing the strain rate, e ˙, and performing sustained loading during otherwise monotonic loading (ML) at a constant e ´ and also by performing ML tests at different constant values of e Ǚ.

TL;DR: In this article, a series of strain-controlled cyclic triaxial tests on an ideal granular material (steel spheres) were used to validate the capability of an axi-symmetric DEM model to analyse cyclic loading.

TL;DR: In this paper, an elastoplastic constitutive model considering sand crushing is proposed, which can reasonably describe the dilatancy of sand from positive to negative in a triaxial compression test.

TL;DR: In this article, a new method of soil-water coupled finite deformation analysis of saturated soils that considers inertial forces is presented. But this method does not consider changes in the geometric shape of the soil to be taken into account and is limited to static or dynamic deformation.

TL;DR: In this paper, a series of 1G large-scale shake table tests and cyclic eccentric loading tests of a shallow foundation model were conducted and the experimental results provide crucial data to model the coupling effect among vertical, horizontal, and overturning loads, the accumulation of irreversible displacement, and the foundation uplift, and so is one of the most complete benchmark data sets for the development and validation of numerical models for the nonlinear response of shallow foundations to strong earthquakes.

TL;DR: In this paper, the relationship between water content (w) and degree of saturation (S) are represented by power function, which are w=AdSBd and w=AwSBw for the dry and the wet sides of optimum, respectively (where Ad, Aw, Bd and Bw are constant).

TL;DR: In this paper, the authors used a modified large shear box apparatus (300 mm×300 mm) to investigate the effect of soil-root matrix on soil strength and cohesion.

TL;DR: In this article, the classic passive earth resistance of cohesionless soil was examined by using two newly developed numerical procedures based on finite element formulations of the bound theorems of limit analysis and non-linear programming techniques.

TL;DR: In this article, a series of undrained torsional shear tests with constant α and b-values were conducted by hollow cylindrical Torsional Shear (HCTS) apparatus on Firoozkuh sand containing a wide range of silt percentage.

TL;DR: In this article, an elasto-plasticity damage model, termed the EPDI model, was proposed to describe the interface between a structure and gravelly soil.

TL;DR: In this article, the effect of slope angle and relative density on bending moment, lateral soil resistance, lateral deflection and non-dimensional p-y curves for piles on sloping ground under surcharge load are developed modifying API RP 2A (2000) method by including a Reduction Factor (R) using the experimental results.

TL;DR: In this article, a series of undrained cyclic torsional shear tests while keeping the specimen height constant was performed on saturated Toyoura sand under different densities, two kinds of in-situ frozen sandy samples and their reconstituted specimens.

TL;DR: In this paper, a unified thermo-mechanical experimental study of saturated and unsaturated states and, in so doing, contributes to the understanding of the non-isothermal mechanical behaviour of unsaturated soils.

TL;DR: A series of undrained, cyclic simple shear tests were performed on reconstituted specimens with various clay contents to study the effects of clay content on liquefaction characteristics of clayey sands based on a framework of an idealized binary packing model and intergrain state parameters.

TL;DR: In this article, the viscous properties of a variety of poorly graded unbound granular materials were investigated by direct shear tests on 12 cm-cubic specimens, which were evaluated by changing the shear displacement rate many times during otherwise monotonic loading.

TL;DR: In this paper, a simplified model based on the isotache concept by using a compression curve and the relationship between the consolidation yield stress and the strain rate was proposed to evaluate the long-term settlement of large structures at the Kansai International Airport.

TL;DR: In this article, the effects of the water content distribution of geosynthetic clay liners (GCLs) prehydrated with actual soils on their hydraulic conductivities against CaCl2 solutions were investigated.

TL;DR: In this article, beam centrifuge tests on a shallow skirted foundation in clay, subjected to uplift and compression, were carried out to investigate the bearing capacity of the shallow-skirted foundations in compression and uplift conditions.

TL;DR: In this article, an extensive series of monotonic and cyclic tests were carried out on triaxial specimens of asphalt concrete used in hydraulic structures and the MTS-dynamic equipment at the Norwegian Geotechnical Institute (NGI) was used for this purpose.

TL;DR: In this article, a pile-group was embedded in dry sand and subjected to sinusoidal waves and an earthquake motion recorded from the 1995 Hyogo-ken Nanbu (Kobe) earthquake.

TL;DR: In this article, a piezocone penetration test (CPTu) method was proposed for evaluating soil liquefaction potential covering a wider range of soil types than previous approaches and using simplified stress-based procedures.

TL;DR: A constitutive modeling of the elasto-viscoplastic stress-strain behavior of geomaterials in shear that has been developed within a non-linear three-component model framework is validated by simulating a comprehensive series of drained triaxial compression (TC) and direct shear (DS) tests on a wide variety of granular materials as mentioned in this paper.

TL;DR: In this paper, a non-linear three-component model that can simulate the elasto-viscoplastic behavior of geomaterials is proposed to analyze the effects of loading rate and ageing.

TL;DR: In this article, the authors investigated the evolution of desaturation process during air injection into saturated soil deposits and verified the validity of a multiphase flow simulator if it is capable of being applied for predicting the process as well as the distribution of degree of saturation after the air injection ceased.

TL;DR: In this article, a case history on the failure of a student dormitory in the campus of Suranaree University of Technology (SUT), Thailand, is presented, where a static formula was used for the preliminary micro-pile design (selection of pile section and length for different loads and soil profiles).

TL;DR: In this paper, the effects of sites and plasticity index (Ip) on the inherent strength anisotropy of eleven different clay deposits are quantitatively examined by the unconfined compression test using a small size specimen with a different angle of inclination to the vertical.

TL;DR: In this article, a series of interconnected type consolidation tests, in which the frictional pressure loss can be minimized by limiting the thickness of each specimen element, are carried out in order to investigate the scale effect of the specimen thickness in the range of 20-200 mm.

TL;DR: In this article, the elastic shear modulus of natural sedimentary clay ground, Gmax, is estimated based on laboratory tests for fifteen different reconstituted clays.