Showing papers in "Computers and Geotechnics in 2004"

TL;DR: Fast Common Plane (FCP) as mentioned in this paper is a new approach to find the common plane between polygonal particles, which can be up to 40 times faster than available search methods for finding the common planes.

TL;DR: In this paper, the benefits of using inverse analysis techniques to select the appropriate parameters to optimize when calibrating a soil constitutive model is discussed with reference to the optimization of the elasto-plastic Hardening-Soil model for four layers of Chicago glacial clays.

TL;DR: In this paper, the authors present an insight into the shear strength functions of unsaturated granulates, and show that the curve of generalized effective stress due to suction is analogous to the water-retention curve, and is correlated with particle gradation.

TL;DR: In this article, a 3D finite element model is applied to simulate the conventional procedure of tunnel excavation and lining and numerical results show the influence of the soil properties and excavation procedures on face deformation and ground settlements.

TL;DR: In this article, an investigation of the hypoplastic equation based on the analysis of response envelopes reveals the reason of this deficiency and an improvement is proposed and compared with experimental results for Rio de Janeiro clay.

TL;DR: In this paper, a cone-penetration test in cohesionless soils is performed and the deformation mode of the soil around the cone, as well as the plastic zone, is shown to be similar to that caused by cavity expansion.

TL;DR: In this study, construction of a neuro-fuzzy system to estimate the deformation modulus of rock masses is aimed, because this modulus has a crucial importance for many design approaches in rock engineering.

TL;DR: In this article, the average degree of consolidation defined by stress (i.e., Up) and that defined by strain (e.g., Us) in large strain theory are different.

TL;DR: In this paper, the authors presented a FE-analysis of spontaneous shear localization inside of non-cohesive sand during plane strain compression, using a hypoplastic constitutive law enhanced by polar, non-local and second-gradient terms to model the shear zone formation.

TL;DR: In this paper, a contact analysis method was proposed to study the effect of nonlinearity and time-dependent deformation on the separation and the deficient of concrete-faced rockfill dams.

TL;DR: In this article, the development of drag load on single piles and piles in groups in consolidating ground was investigated from 2D and 3D elasto-plastic numerical analyses.

TL;DR: In this paper, the effect of stress-history input (SHI) and velocity history input (VHI) on wave propagation and wave attenuation in jointed rock masses was studied.

TL;DR: In this paper, a thermo-hydro-mechanical (THM) constitutive model for unsaturated soils is proposed based on the existing models, and the influences of temperature on the hydro-machinery behavior in unsaturated soil are described in the model.

TL;DR: In this paper, the authors derived the hydraulic conductivity function of unsaturated soils from the fractal model for the pore-size distribution, and were expressed by only two independently physical parameters, the Fractal dimension and the air-entry value.

TL;DR: In this article, a multi-laminate constitutive model was developed to describe two important characteristics of soft clay behaviour: strength anisotropy and destructuration, which was applied to the boundary value problem of an embankment on soft ground.

TL;DR: In this article, a numerical model based on the finite element method is proposed to analyze the three-dimensional behavior of an embankment on soft soils incorporating vertical drains, which incorporates the Biot's consolidation theory (coupled formulation of the flow and equilibrium equations) and constitutive relations simulated by the p − q − θ critical state model.

TL;DR: In this article, the authors examined the development and decay of pressure within a fluid inclusion, with a spheroidal shape, located in an extended fluid saturated poroelastic medium.

TL;DR: In this paper, the variation of shear strength with respect to matric suction is described by using the air-entry value and the internal friction angle of a soil specimen.

TL;DR: In this paper, a simple model which describes the soil-pipe interaction and accounts for the longitudinal soil variation has been developed for the analysis of the static response of a section of a buried sewer.

TL;DR: In this article, the bearing capacity of a strip footing, subjected to a non-eccentric inclined load, resting on a ponderable cohesive-frictional soil, is evaluated using finite elements and nonlinear programming.

TL;DR: In this paper, a unified finite element formulation associated with saturated and unsaturated soils is presented and a comparison is performed between the Pastor-Zienkiewicz and cap plasticity models through the dynamic analysis of the failure of lower San Fernando dam under the 1971 earthquake and the Mahabad and Doroodzan dams under the 1978 Tabas earthquake.

TL;DR: In this paper, the state-dependent constitutive model for rubber tire chips and rubber tire chip-sand mixtures was presented and its successful implementation into a numerical analysis (FLAC) program was verified by simulation of the stress-strain characteristics of rubber tire Chip-Sand mixtures in triaxial testing, and numerical simulations as well as parametric studies of the effects of the reinforcement stiffness and interface shear stiffness on the behavior of the reinforced wall have been performed.

TL;DR: In this paper, a new Monte Carlo random simulation method was proposed to identify the 3D critical slip surface of a slope, in which assuming the initial slip as the lower part of an ellipsoid and the slope stability analysis is based on a column-based three-dimensional slope stability model, a new geographic information systems (GIS) grid-based 3D deterministic model has been developed to calculate the threeD safety factor.

TL;DR: In this paper, a finite difference method (FDM) based on boundary-fitted coordinate (BFC) transformation is presented to analyze the steady seepage in a foundation pit, a lock foundation, and an embankment dam with a free surface.

TL;DR: In this paper, a tri-linear softening model for pile-soil interaction along the shaft and a trilinear fully plastic model for load-settlement curve of a pile in layered soils are proposed.

TL;DR: Relevant theory is developed for constructing random relations describing soil properties, aggregating information from different sources and propagating it through geotechnical models, and is applied to the analysis of the stability with respect to rainfall-induced landsliding using a combined slope hydrology and stability model.

TL;DR: In this article, the authors apply numerical limit analysis to evaluate the bearing capacity of strip footings on an anisotropic, homogenous material, and obtain a rigorous lower bound on the actual collapse load.

TL;DR: In this article, the authors evaluated the three-dimensional base stability of rectangular excavations in soft soils using the finite element method with reduced shear strength, and found that the base stability was significantly influenced by the following factors: (1) the depth to width ratio, (2) the thickness of the soft soil layer between the excavation base and the hard stratum, (3) the depths of walls inserted below the excavation, (4) the stiffness of walls, and (5) the length-to-width ratio of the excavation.

TL;DR: In this article, an infinite beam resting on reinforced granular bed overlying a soft soil strata subjected to a moving load with constant velocity is presented, where the separation between the beam and ground surface is taken into the account while analyzing the system.

TL;DR: In this article, the authors present an analysis of shallow tunneling in saturated poro-elastoplastic media by means of an enhanced finite element method with strong discontinuities.