Showing papers in "Computers and Geotechnics in 2009"

TL;DR: In this article, the development and application of design charts for monopile foundations of offshore wind turbines in sandy soil under long-term cyclic lateral load was described, in which a normalized ultimate lateral resistance of a pile is used.

TL;DR: In this article, a 3D spherical discrete model with a rolling resistance was used to model the roughness of Labenne sand and the desired porosity was obtained by a radius expansion method.

TL;DR: In this paper, a numerical procedure for integrating a commercial finite difference method into a probabilistic analysis of slope stability is presented, where an artificial neural network (ANN)-based response surface is adopted to approximate the limit state function, thereby reducing the number of stability analysis calculations.

TL;DR: In this article, a 3D slope stability analysis is performed by the strength reduction method (SRM) and the limit equilibrium method (LEM) for simple slopes, and the authors have discovered many interesting results which appear to be surprising, but a more detailed analysis by the SRM and LEM along with some physical insight have suggested that these results may be true for simple slope.

TL;DR: In this article, a finite element method with shear strength reduction technique (SSRFEM) has been successfully applied to the slope stability analysis in absence of seepage and some primary numerical results concerning the stability of an earth dam under rapid drawdown are presented.

TL;DR: In this paper, a micromechanical model is proposed for studying the stability and failure process of slopes based on the gravity increase method (GIM), where the heterogeneity of rock at a mesoscopic level is considered by assuming that the material properties conform to the Weibull distribution.

TL;DR: In this paper, the relationship between Darcy's law and Navier-Stokes equations was verified for complex pore geometries of a granular material using X-ray computer assisted micro-tomography.

TL;DR: In this paper, the authors used the finite element method to determine the vertical bearing capacity of strip and circular footings resting on a sand layer, using an elastic-perfectly plastic Mohr-Coulomb constitutive model.

TL;DR: In this article, the critical slip surface is divided into two parts when the pile spacing is small, and these two parts gradually get connected with the increase of pile spacing until a clear critical slip surfaces is formed.

TL;DR: In this article, the critical slip surface is defined as the points at which the equivalent plastic strain arrives at the maximum in the vertical direction, and the functional data are smoothed by the least squares.

TL;DR: In this article, the authors introduce the concept of potential particles, which can be used to define convex particles with a wide variety of shapes, from almost polygonal to circular.

TL;DR: In this article, the authors used a discrete element approach to predict drying shrinkage and associated cracking in fine-grained soil and showed the efficiency of discrete element modeling for the prediction and understanding of dry shrinkage.

TL;DR: Predictions of bearing capacity from the developed multiple regression models and MLP in tractable equations form are obtained and compared with the value predicted using traditional methods and indicate ANNs are able to predict accurately the bearing capacity of strip footing and outperform the existing methods.

TL;DR: In this article, a two-surface plasticity constitutive model based on critical-state soil mechanics is proposed to simulate sand response under various loading conditions and predicts both drained and undrained behavior of sands at small and large strains using the actual small-strain shear modulus, as measured in resonant column or bender elements tests, along with realistic values of Poisson's ratio.

TL;DR: In this paper, a fully coupled multiphase flow, thermal transport and stress/deformation in geological porous media was developed based on the momentum, mass and energy conservation laws of the environment.

TL;DR: In this paper, group method of data handling (GMDH) type neural networks optimized using genetic algorithms (GAs) were used to model the effects of effective cone point resistance (qE) and cone sleeve friction (fs) as input parameters on pile unit shaft resistance, applying some experimentally obtained training and test data.

TL;DR: It is demonstrated that the ANN model outperforms the traditional methods and provides accurate pile settlement predictions.

TL;DR: In this paper, the finite element upper and lower bound techniques were applied to provide seismic stability charts for rock slopes, where the pseudo-static method was employed by assuming a range of the seismic coefficients.

TL;DR: In this article, a complete case record of an excavation in sand is explored, and numerical analyses were conducted to evaluate the influences of soil elasticity, creep and soil-wall interface.

TL;DR: In this article, a hybrid method compatible with the notion of sub-structuring is proposed to investigate the most efficient, precise, and economical design for a bridge foundation, based on both experimental data and nonlinear 3-D analysis.

TL;DR: In this article, an extensive numerical analysis was carried out to study the pillar deformation and failure process under natural loading conditions, and the results showed a fairly good match between numerical and field data and the conducted analysis can be used as a qualitative guideline in the design of rock pillars in underground structures.

TL;DR: In this article, the authors compared the vertical surface displacements monitored during the advancing excavation to the settlements estimated by using analytical and empirical formulations and by setting up a three-dimensional finite element model that could simulate, step by step, the different tunnel excavation and supporting phases.

TL;DR: In this article, a generalised effective stress framework is proposed to clarify the effective stress lexicon commonly used for unsaturated soils, one of the purposes being to contribute to a more accurate definition and understanding of conventional Bishop's stress.

TL;DR: In this article, a numerical modeling approach is proposed for predicting the progressive caving behaviour of strata and performance of powered roof support in a given geo-mining and strata condition.

TL;DR: In this paper, finite element modeling of an in situ thermal experiment has been carried out based on a thermo-hydro-mechanical (THM) finite element approach including a consistent thermoplastic constitutive model.

TL;DR: In this article, the authors examined the small-strain behavior of Taipei clays in braced excavation through a detailed analysis of a well-documented case history, and showed that the observed wall deflection and surface settlement can be satisfactorily predicted simultaneously using the 3-SKH model.

TL;DR: In this article, a nonlinear analysis of laterally loaded rigid piles in cohesionless soil is presented, which assumes that both the ultimate soil resistance and the modulus of horizontal subgrade reaction increase linearly with depth.

TL;DR: In this article, a FLAC-based numerical model is developed to predict and analyse the heat developed by hydrating CPB structures, and the results of the developed model are compared with three case studies (mathematical, laboratory, and field investigations).

TL;DR: In this article, a new numerical model dedicated to earth structures reinforced with geosynthetic sheets, based on coupling the finite element method and the discrete element method (DEM), is proposed.

TL;DR: In this paper, the effect of subsequent tunnelling on the support system of the existing tunnel was investigated using a full three-dimensional finite element analysis coupled with elasto-plastic material models.