Showing papers in "Computers and Geotechnics in 2020"

TL;DR: In this paper, a new numerical approach for modeling the localised leakage of shield tunnel lining is proposed, in which the leakage is simulated using a one-dimensional leakage element, which overcomes the limitations on the solid meshing of the leakage element and also reduces computational error due to the size difference between the solid leakage elements and lining element.

TL;DR: In this article, a series of techniques are incorporated into the original NMM (numerical manifold method) to simulate the entire process of the progressive failure of rock slopes, including strength-based LT criterion, which can account for tensile cracks, tensile shear cracks and compressive-shear cracks.

TL;DR: In this article, a novel approach is presented to describe the dynamic interaction system of a large-diameter floating pipe pile and surrounding soils, taking the three-dimensional wave effects into account.

TL;DR: In this paper, the Johnson-Holmquist damage constitutive model was adopted, based on the LS-DYNA secondary development technology, and smooth particle hydrodynamics (SPH) was introduced to simulate the fluid.

TL;DR: In this paper, a new analytical model for calculating the horizontal dynamic impedance of pile groups with arbitrary members connected with a rigid pile cap is presented, which allows robustly the effect of pile-to-pile interaction on the impedance of the group, by accounting for the secondary waves generated by the vibration of the receiver pile, and how these alter the response of the source pile.

TL;DR: In this paper, a nonlinear strength reduction method based on the Generalized Hoek-Brown (GHB) criterion has been proposed to find an optimal set of parameters that trigger rock slope failure.

TL;DR: In this paper, a new failure mechanism is constructed on the basis of the deformation characteristics of the rock mass around an existing tunnel induced by an adjacent excavation, which is derived in the framework of the upper bound theorem in conjunction with a variational approach.

TL;DR: In this article, a new failure mechanism that combined with the Protodyakonov's theory and the multi-block failure mechanisms is proposed to deal with the face stability of deep tunnels in sandy layer.

TL;DR: In this article, a modified one-dimensional conditional Markov chain model is proposed to model the stratigraphic boundary uncertainty (SBU) arising from limited site investigation data on slope stability analysis with the consideration of soil spatial variability.

TL;DR: In this paper, the authors proposed a theoretical approach to evaluate the variation in excess pore water pressure caused by the installation of a jet grouting column in clay, accounting for the chronological sequence of construction.

TL;DR: In this paper, a homogenization equation is proposed for the small strain stiffness of gap-graded granular soils to reproduce the small-strain stiffness observed in numerical simulations and further validated by laboratory test data from the literature.

TL;DR: In this paper, a random field-based approach for modelling the stratigraphic uncertainty is presented, in which, the spatial correlation of the stratum existence between different subsurface elements is characterized by an autocorrelation function, and the probability of the existence of a particular stratum in a given non-borehole element is determined according to the derived spatial correlations.

TL;DR: In this paper, a finite element model was developed to simulate the flexible pavement structure by considering the nonlinear characteristics of subgrade soils which are related to humidity and stress, and a UMAT was programmed to characterize nonlinear moisture and stress-sensitive relationship of sub grade soils.

TL;DR: In this article, the authors examined the seismic slope failure mechanism of rotational sliding mass and calculated the permanent displacement based on Newmark's sliding block theory, with extension to compute the rotational displacement in the presence of horizontal ground acceleration history.

TL;DR: In this paper, a series of monotonic and cyclic triaxial shearing tests on Toyoura sand are simulated by discrete element method (DEM) incorporating rolling resistance.

TL;DR: In this article, the authors use the Discrete Element Method (DEM) to model concrete samples and assess the roles of the strength of aggregates and of the aggregate/mortar interfacial transition zone (ITZ) on concrete strength.

TL;DR: In this article, a new fluid-solid coupled numerical approach by combining the Dynamic Fluid Mesh method with DEM (discrete element method) is applied to simulate suffusion, which accounts for permeability and porosity changes due to soil skeleton deformation and suffusion.

TL;DR: In this paper, the effect of particle shape on particle breakage was investigated through triaxial tests on sand assemblies mixed with non-spherical agglomerates using the discrete element method.

TL;DR: In this article, a three-dimensional discrete element grain-based stress corrosion model incorporating the theories of subcritical crack growth and chemical reaction rate was built to explore the time-dependent behavior of damage evolution and fracture patterns of brittle rocks on a mesoscopic scale.

TL;DR: In this article, a 3D numerical mesoscale model is proposed to describe the time-independent deformation and fracturing of brittle rocks that accounts for material heterogeneity and local material degradation.

TL;DR: In this article, the behavior of a prefabricated vertical drain unit cell with clays of high initial water content has been investigated by laboratory model tests and finite element analysis (FEA).

TL;DR: This paper presents machine learning aided stochastic reliability analysis of spatially variable slopes, which significantly reduces the computational efforts and gives a complete statistical description of the factor of safety with promising accuracy compared with traditional methods.

TL;DR: In this paper, a unique anisotropic double porosity elastoplastic framework was developed to describe the coupled solid deformation-fluid flow in the transversely isotropic fissured rocks.

TL;DR: In this paper, a lower bound finite element limit analysis is presented for the undrained stability of unsupported rectangular excavations in non-homogeneous clays, and a new design equation of the problem is also presented for practical use by practising engineers.

TL;DR: In this paper, a combined finite-discrete element method (FDEM) was developed to simulate solid fracture by defining a traction-separation damage law, which is capable of simulating breakage behaviors of sand particles.

TL;DR: In this article, the effects of irregular particles on macroscopic and microscopic behavior under triaxial compression tests for a range of various roundnesses were investigated, and the microscopic characteristics, including the coordination number, particle rotation and percentage of sliding contacts, were examined.

TL;DR: In this paper, the impact of yaw excavation loadings on ground displacement and segmental stress for a curved shield tunnel is investigated through finite element models, the reliabilities of which are validated through comparisons to field data and analytical solutions.

TL;DR: In this article, the particle flow code is used to analyze the dynamic process of the Xinmo landslide, including: disintegration, entrainment, granular flow and accumulation, and the results show that the kinetic characteristics of the collapse mass were more sensitive to the bond strength than to the friction coefficient.

TL;DR: In this article, a modified Holmquist-Johnson-Cook (HJC) model was proposed to capture the compressive behavior but not the tensile behaviour of brittle materials.

TL;DR: The results indicate that the proposed approach has both good accuracy and efficiency in slope reliability analysis involving the copula-based cross-correlated random fields of c and ϕ at low failure probability levels.