Showing papers in "Computers and Geotechnics in 2006"

TL;DR: In this article, the authors describe the application of the artificial neural network model to predict the lateral load capacity of piles in clay and compare the ANN model with the available empirical models: the best fit line for predicted load capacity and measured load capacity, the mean and standard deviation of the ratio Qp/Qm, and the cumulative probability for load capacity.

TL;DR: In this article, the influence of vertical loads on the lateral response of piles installed in sandy soils is brought out through 3-dimensional finite element analyses, where the pile was treated as a linear elastic material and the soil was idealized using the Drucker-Prager constitutive model with a nonassociated flow rule.

TL;DR: In this paper, a new approach based on genetic programming (GP) for determination of liquefaction induced lateral spreading is presented, which is trained and validated using a database of SPT-based case histories.

TL;DR: In this article, comparative numerical simulations of a mechanised tunnel advance in homogeneous, overconsolidated, soft, cohesive soil below the ground water table are performed and sensitivities are evaluated.

TL;DR: In this article, a uniform initial value problem of ordinary differential equations for locating the critical slip lines corresponding to the two commonly used definitions was formulated and a prediction-correction procedure was proposed.

TL;DR: In this paper, two-dimensional and three-dimensional lattice Boltzmann (LB) models were developed to represent pore-scale monophasic Newtonian incompressible fluid flow in granular materials.

TL;DR: In this paper, the computational intelligence techniques such as multilayer perceptron (MLP), radial basis function (RBF) and genetic programming (GP) are used to develop a mathematical model.

TL;DR: In this article, an analysis model that couples the water freezing, temperature and stress fields was proposed to predict the vertical component of the frost heave with a normal distribution at the tunnel axis, while the horizontal component reaches a maximum at a distance from a tunnel axis.

TL;DR: In this article, the authors considered undrained triaxial loading on very loose sands and the failure mode occurring at q-peak, and, in a second part, the bifurcation domain of sands in plane strain conditions through strain proportional paths and incrementally piecewise linear and non-linear constitutive relations.

TL;DR: In this paper, a correlation-based image analyzing algorithm is presented that measures the displacements of tracing points at sub-pixel accuracy from the image series, and two types of soil movement analysis, namely SMA (soil mass movement analysis) and PTA(soil particle tracking analysis), are proposed to meet the different requirements of practical measurements during an interface test.

TL;DR: In this paper, the authors present closed-form solutions for a free-head pile embedded in an elastic-plastic, non-homogeneous soil by simulating pile-soil interaction using a series of springs distributed along the pile shaft.

TL;DR: In this paper, the development of a FEM model that predicts ground vibrations due to blasting, a very complex problem involving factors very difficult to quantify: ground anisotropy, sequencing time of the blasting shots, action of each shot, etc.

TL;DR: New correspondent GIS grid-based 3D deterministic models to calculate the safety factor of the slope are devised and a GIS-based program, 3DSlopeGIS, has been developed to implement the algorithm where all the input data are in the same format as the GIS dataset.

TL;DR: In this article, normalized, coupled governing equations for one-dimensional thermal consolidation problems are established and the non-dimensional coefficients of thermal consolidation and thermal diffusivity are defined accordingly.

TL;DR: In this article, a subway tunnel in saturated sandy deposit over a layer of non-liquefiable soils and the working mechanism of cutoff walls for uplift mitigation purpose were investigated using the fully coupled dynamic finite element code DIANA Swandyne-II.

TL;DR: In this article, the behavior of vertical anchor plates embedded in reinforced and non-reinforced cohesionless soil has been investigated with the help of small-scale model tests, and the test results indicate that this type of reinforcement significantly increases the stiffness of the soil and the pullout resistance of shallow anchor plates.

TL;DR: In this article, two slope models with circular slip mechanism are presented to represent shear failures in simple fill or cut slopes and long natural slopes, and for each of the models, two dimensionless parameters regarding c′/tan ǫ and maximum depth of the critical slip surface are introduced.

TL;DR: In this paper, a low strain integrity test is adopted to assess the quality of cast-in situ reinforcement concrete piles with high slenderness ratios, and a new proposed numerical signal process method is applied to explore the time-frequency component of the testing result which shows better resolution than traditional methods.

TL;DR: In this paper, the effect of soil damping on the most important design variables in the seismic response of building structures with prismatic rectangular foundations was quantified using a soil-structure interaction model.

TL;DR: In this paper, a smooth discretisation of the pile surface is proposed using Bezier polynomials, and an automatic load stepping scheme is proposed, which features an error control algorithm and automatic subincrementation of the load increments.

TL;DR: In this article, the effect of the distribution of the initial void ratio and fluctuations of the current local void ratio on the evolution of the internal shear localization within a granular body under plane strain conditions during a compression test was investigated.

TL;DR: In this paper, a load transfer approach using t − z / q − z and p − y curves is used for the analysis of single piles and a finite element technique is used to combine the pile stiffness with the stiffness of the cap and column.

TL;DR: In this article, a constrained optimisation technique for the calibration of elasto-plastic model parameters in a rational and objective manner is presented. But this technique is not suitable for the case of multi-mechanism constitutive models.

TL;DR: In this article, a non-linear failure criterion was proposed for slope stability analysis, which does not employ any kinematical and static assumptions and is based on a variational approach.

TL;DR: Within a microplane theory framework, a model has been developed to simulate the response of sandy soils subjected to non-proportional loading, which occurs in geotechnical engineering as mentioned in this paper.

TL;DR: In this paper, the frequency domain dynamic response of a pile embedded in a porous medium subjected to SH seismic waves is investigated, and the second kind of Fredholm integral equation for the pile is established in terms of the obtained fundamental solution and free wave field.

TL;DR: In this paper, the authors present a procedure to estimate the drawdown, the soil consolidation settlement, the negative friction on the pile shaft and the additional pile settlement induced by dewatering in phreatic zones.

TL;DR: In this paper, a robust and efficient elasto-plastic boundary element method (BEM) is proposed for complex problems in geomechanics, where the strong singularities arising in the domain integrals of the stress integral equations are removed by transforming them from (cell) boundary integrals.

TL;DR: In this paper, the effects of artificial cavities on the attenuation of air-blast waves in the concrete defense layer were investigated and two empirical formulae were proposed to relate the decay factor of peak axial stress to the dimensions and relative positions of rectangular and circular cavities.