Journal: Computers and Geotechnics

Abbreviation

Comput. Geotech.

Publisher

Elsevier

Journal Volumes

ISSN

0266-352X
1873-7633

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2011 - 2019112020 - 202617
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Publications 1 - 10 of 28
  • An implicit 3D nodal integration based PFEM (N-PFEM) of natural temporal stability for dynamic analysis of granular flow and landslide problems
    Item type: Journal Article
    Zhang, Yujia; Zhang, Xue; Nguyen, Hoang; et al. (2023)
    Computers and Geotechnics
    The particle finite element method (PFEM) is a robust approach for modelling large deformation problems with free surface evolution. The classical PFEM, however, requires variable mapping from old to new quadrature points when adopting history-dependent material models in granular flow and landslide problems. Although the nodal integration technique circumvents this issue, it makes the PFEM temporal instable in dynamic analysis when using a displacement-based formulation. In this study, we developed a new version of a three-dimensional (3D) Nodal integration based PFEM (N-PFEM) using a mixed variational principle with the final problem resolved in mathematical programming. The proposed N-PFEM not only inherits the benefit from the nodal integration scheme that no variable mapping is required for handling history-dependent models but also is naturally temporal stable requiring no ad-hoc stabilization technique. We simulated a series of benchmark problems to demonstrate its nature of temporal stability as well as other admirable features such as the volumetric-locking free property and capability for tackling extreme configuration changes. Additionally, its application to a 3D landslide with a sensitive clay layer is shown to highlight its robustness.
  • Analytical and 3D numerical modelling of full-height bridge abutments constructed on pile foundations through soft soils
    Item type: Journal Article
    Kelesoglu, M.K.; Springman, Sarah M. (2011)
    Computers and Geotechnics
  • A generalized joint pyramid method for removability analysis of rock blocks: Theoretical formulation and numerical implementation
    Item type: Journal Article
    Wang, Shuaifeng; Zhang, Zixin; Huang, Xin; et al. (2021)
    Computers and Geotechnics
    The traditional Block Theory divides a concave block into a finite number of convex sub-blocks before the removability analysis, and deals with the removability and kinematics independently, which are computationally inefficient. This paper proposes a new concept of removable domain, based on which a generalized joint pyramid (GJP) method is established to overcome the aforementioned limitations. The translational removability analysis of convex and concave blocks can be unified through GJP based on the fact that concave regions have no contribution to the removability and can thus be omitted accordingly, avoiding partition of concave blocks into convex sub-blocks. To achieve this, joints are classified as essential joints and redundant joints. Only essential joints are considered in kinematics analysis as the block will not penetrate the rock mass when sliding along the essential joints, and its motion changes once the essential joints are altered. Thereby, the number of joint planes in the removability analysis and the number of possible motion modes that need to be assessed in the kinematics analysis can be significantly reduced. The GJP method was implemented in the stereo-analytical method and its efficiency and effectiveness in the removability and kinematics analysis of translational motion were demonstrated through some generic scenarios.
  • The use of discrete fracture networks for modelling coupled geomechanical and hydrological behaviour of fractured rocks
    Item type: Review Article
    Lei, Qinghua; Latham, John-Paul; Tsang, Chin-Fu (2017)
    Computers and Geotechnics
    We present a discussion of the state-of-the-art on the use of discrete fracture networks (DFNs) for modelling geometrical characteristics, geomechanical evolution and hydromechanical (HM) behaviour of natural fracture networks in rock. The DFN models considered include those based on geological mapping, stochastic generation and geomechanical simulation. Different types of continuum, discontinuum and hybrid geomechanical models that integrate DFN information are summarised. Numerical studies aiming at investigating geomechanical effects on fluid flow in DFNs are reviewed. The paper finally provides recommendations for advancing the modelling of coupled HM processes in fractured rocks through more physically-based DFN generation and geomechanical simulation.
  • Molecular dynamics simulation on microscopic water evaporation process from montmorillonite surface
    Item type: Journal Article
    You , Yue; Tang , Chao-Sheng; Zhang , Siqi; et al. (2026)
    Computers and Geotechnics
    Water evaporation process significantly affects clayey soils’ engineering properties, resulting in potential risks for geotechnical, geological and geoenvironmental practices. With the inherent limitations, conventional macroscopic experiments are impossible to describe the complex microscopic interactions in clay mineral–water systems that are essential for the understanding of evaporation process in clay. The primary objective of this study is to address this gap by performing molecular dynamics (MD) simulations to investigate water evaporation on a typical clay mineral Na-montmorillonite. Focusing on this objective, a MD model (EvMD-CLAY) is first presented and then adopted for water evaporation investigation. The results indicate that evaporation on the surface of clay exhibits three distinct stages: the constant rate stage, the falling rate stage, and the residual stage. In the constant rate stage, only free water evaporates at a constant rate that depends on the ambient temperature, while bound water gradually transitions to free water. The majority of the bound water evaporates during stage II, while the evaporation rate gradually decreases to near zero. Few residual water molecules remain adhered to the clay surface in stage III when the temperature is below 380 K. The residual water molecules are adsorbed onto the substitution sites on the clay surface, forming outer-sphere surface complexes with the surrounding Na+ cations. It can be concluded that the interaction between clay minerals and water molecules, which causes the stratification of the water layer on the clay surface, is the main reason for the staged evaporation process. These findings are essential for a deeper understanding of the microscopic intrinsic mechanisms governing evaporation in clay.
  • An efficient inverse analysis procedure for braced excavations considering three-dimensional effects
    Item type: Journal Article
    Wang, Ze-Zhou; Goh, Siang H.; Koh, Chan G.; et al. (2019)
    Computers and Geotechnics
  • Can we estimate far-field stress using the mean of local stresses? An examination based on numerical simulations
    Item type: Journal Article
    Gao, Ke; Lei, Qinghua; Bozorgzadeh, Nezam; et al. (2019)
    Computers and Geotechnics
  • Modelling stress-dependent single and multi-phase flows in fractured porous media based on an immersed-body method with mesh adaptivity
    Item type: Journal Article
    Obeysekara, Asiri; Lei, Qinghua; Salinas, Pablo; et al. (2018)
    Computers and Geotechnics
    This paper presents a novel approach for hydromechanical modelling of fractured rocks by linking a finite-discrete element solid model with a control volume-finite element fluid model based on an immersed-body approach. The adaptive meshing capability permits flow within/near fractures to be accurately captured by locally-refined mesh. The model is validated against analytical solutions for single-phase flow through a smooth/rough fracture and reported numerical solutions for multi-phase flow through intersecting fractures. Examples of modelling single- and multi-phase flows through fracture networks under in situ stresses are further presented, illustrating the important geomechanical effects on the hydrological behaviour of fractured porous media.
  • A boundary-spheropolygon element method for modelling sub-particle stress and particle breakage
    Item type: Journal Article
    Alonso-Marroquín, Fernando; Jiang, Yupeng; Herrmann, Hans J. (2019)
    Computers and Geotechnics
  • Modelling tunnel-induced deformations with the material point method
    Item type: Journal Article
    Fern, Elliot James (2019)
    Computers and Geotechnics
Publications 1 - 10 of 28