Showing papers in "Computers and Geotechnics in 2016"

TL;DR: In this article, a synthetic rock mass (SRM) model is proposed to simulate hydraulic fracture propagation in naturally fractured reservoirs by using the bonded particle model (BPM), which is an assembly of circular or spherical particles bonded to each other.

TL;DR: In this paper, an improved Cholesky decomposition technique is presented for the simulation of the globally non-stationary random fields of spatially variable soil properties in the multiple soil layers.

TL;DR: In this paper, a novel approach is proposed, based on the concept of state parameter, for the examination of the validity of G max equations in capturing the effects of void ratio and confining pressure on the small-strain behavior of granular soils.

TL;DR: In this paper, the results of 3-D thermo-hydro-mechanical finite element analyses that investigated the behavior of a group of energy piles for which field data were available are presented.

TL;DR: In this article, the authors used an optical scanning apparatus and CAD techniques to reconstruct a virtual joint specimen with the natural rock's joint morphology, and a 3D printer then manufactured a physical mold based on the virtual joint specimens for casting concrete or plastic specimens quickly and accurately.

TL;DR: In this article, a fractal length distribution model of fractures in discrete fracture networks (DFNs) is presented, which is based on the cubic law of the fractal dimension.

TL;DR: In this paper, a series of model tests were performed using a 2D multiple trapdoor system, similar to a two-dimensional unreinforced piled embankment, and three soil arching evolution patterns were observed in the tests.

TL;DR: In this article, an evolutive elasto-plastic model is developed to address the vital role of binder hydration in the evolution of the mechanical behavior and properties of cemented paste backfill (CPB).

TL;DR: In this article, a distinct element grain-based method (GBM) was developed to simulate the microstructure of rock-like materials, which can be readily constructed with a given mineral composition, allowing independent assignment of specific properties to both the grains and grain boundaries.

TL;DR: In this paper, a three-dimensional discrete element model is used to investigate the effect of grain crushing on the tip resistance measured by cone penetration tests (CPT) in calibration chambers.

TL;DR: In this article, a hierarchical multiscale modeling approach is used to investigate three-dimensional (3D) strain localization in granular media, where a hierarchical coupling of finite element method and discrete element method (DEM) is employed to treat a boundary value problem of a granular material and the required constitutive relation for FEM is derived directly from the DEM solution of a GEM Gauss integration points as the representative volume element (RVE).

TL;DR: In this paper, a three-dimensional bonded contact model is developed to simulate the mechanical behavior of bonded granular material using the discrete element method, where the strength and stiffness of the bond material are incorporated into a previous unbonded contact model where the complete interactions in the normal, tangential, rolling and torsional directions are included.

TL;DR: In this paper, a three-dimensional numerical analysis of a well-monitored DCM (deep cement mixing) column-supported embankment for a highway in Thailand is presented, and the results are compared with the field measurements, including settlement, load distribution between soil and DCM columns, excess pore water pressure and lateral movement.

TL;DR: In this paper, an auxiliary random finite element method (ARFEM) is proposed for efficient 3D slope reliability analysis and risk assessment considering spatial variability of soil properties, which mainly consists of two steps: (1) preliminary analysis using a relatively coarse finite-element model and Subset Simulation, and (2) target analysis with a detailed finite element model and response conditioning method.

TL;DR: In this article, the material point method (MPM) is applied to simulate the pile installation process and subsequent static pile loading tests, which is an extension of the finite element method (FEM), which is capable of modelling large deformations and soil-structure interactions.

TL;DR: The results clearly demonstrate the potential of 3D conditional simulation in directing exploration programmes and designing cost-saving structures by reducing uncertainty and improving the confidence in a project's success.

TL;DR: In this article, the authors used the contemporary material point method (MPM) to provide a view of how retrogressive and progressive slope failures develop, and presented two main scenarios: (a) a relatively small slope, which, when subjected to an initial failure, is steepened, leading to the initiation of further failures retrogressing backwards.

TL;DR: In this paper, the uncertainty in factor of safety (FS) and probability of failure (Pf) of slope induced by the geological uncertainty is evaluated using borehole data using an efficient coupled Markov chain model.

TL;DR: In this article, the authors extend the interaction factor concept from the framework of conventional pile groups to that of energy pile groups, and present charts for the analysis of the displacement interaction between two identical energy piles over a broad range of design conditions.

TL;DR: In this article, a two-phase Material Point Method is applied to simulate large soil deformations and generation and dissipation of excess pore pressures during penetration, and the constitutive behaviour of soil is modelled with the Modified Cam Clay model.

TL;DR: A review of the numerical works that have been done in the last decade to model opening of natural fractures during hydraulic fracturing, focusing especially on mechanical models that address propagation of hydraulic fractures in naturally fractures reservoirs is presented in this paper.

TL;DR: The main purpose of this paper is to provide a unified MPM framework, in which both quasi-static and dynamic analyses can be solved, and to demonstrate the model behaviour.

TL;DR: In this paper, an anisotropic elasto-plastic solution to the undrained expansion of a cylindrical cavity in K 0 -consolidated clay is presented.

TL;DR: In this paper, a mixture of sand and rubber particles were simulated using DEM and the size of the rubber particles varied from 0% to 50% and the numerical samples were sheared in the range of 10 −5 −10 −2 % of e 1.

TL;DR: In this article, a coupled thermo-hydraulic finite element model for freezing soils integrated within an optimization algorithm using the ant colony optimization (ACO) technique to optimize ground freezing in tunneling by finding the optimal positions of the freeze pipe, considering seepage flow.

TL;DR: In this paper, the authors discuss the fundamental physics and constitutive models that are common to these different applications, and summarize recent advances in the development of relevant analytical tools for the design and analysis of different geo-energy applications.

TL;DR: In this article, a Mohr-Coulomb model with strain softening behavior induced by increasing deviatoric plastic strain is used to simulate the post failure behavior (run-out and sliding velocity).

TL;DR: In this article, a new three-dimensional failure mechanism is proposed to analyze the limit support pressure of the tunnel face in multilayered cohesive-frictional soils based on limit analysis methods.

TL;DR: In this paper, a grain-based distinct element model (GBM) is used to investigate the influence of specimen size on the strength of intact (not defected) and defected rocks.

TL;DR: In this paper, a computer code was developed to analyze 3D images of granular materials to measure particle lengths (size), volume, surface area, global centroid location and orientation.