International Journal of Geomechanics: Recent submissions
Now showing items 3601-3620 of 4049
-
Numerical Study of Zonal Disintegration within a Rock Mass around a Deep Excavated Tunnel
(American Society of Civil Engineers, 2012)Zonal disintegration around a deep excavated tunnel is a characteristic of the rock mass intense fracturing phenomenon. In this paper, three-dimensional numerical tests on the failure processes of rock samples containing ... -
Identification and Validation of Rolling Friction Models by Dynamic Simulation of Sandpile Formation
(American Society of Civil Engineers, 2012)Rolling friction plays an important role in the heap formation of granular materials. In this paper, three rolling friction models, which are incorporated into the discrete element method, are compared with simulation of ... -
Closed-Form Elastoplastic Solution for the Wellbore Problem in Strain Hardening/Softening Rock Formations
(American Society of Civil Engineers, 2012)This paper proposes an analytical approach predicting the development and progress of the plastic zone around a wellbore drilled in linear hardening or softening Drucker-Prager rocks in a theoretically consistent way. With ... -
Numerical Simulations for Large Deformation of Granular Materials Using Smoothed Particle Hydrodynamics Method
(American Society of Civil Engineers, 2012)Application of the smoothed particle hydrodynamics (SPH) method to the simulation of granular materials under large deformation is presented. The Drucker–Prager constitutive model with nonassociated flow rule is implemented ... -
Ice Gouging over a Buried Pipeline: Superposition Error of Simple Beam-and-Spring Models
(American Society of Civil Engineers, 2012)Two types of models, coupled and uncoupled, are currently used to determine the extent to which it is necessary to bury subsea pipelines deeper than the maximum expected depth of ice gouges. In the uncoupled model, the ... -
Analysis and Mathematical Solutions for Consolidation of a Soil Layer with Depth-Dependent Parameters under Confined Compression
(American Society of Civil Engineers, 2012)This paper presents several analytical solutions for the consolidation analysis of a soil layer with fairly general laws of variation of permeability and compressibility for both a single-drained condition and a double-drained ... -
Coupled Hydro-Mechanical Elastoplastic Constitutive Model for Unsaturated Sands and Silts. II: Integration, Calibration, and Validation
(American Society of Civil Engineers, 2012)Following the comprehensive model formulation given in Part I, a fully implicit integration procedure for the rate equations using a closest point projection method is presented in this paper. The stress-update algorithm ... -
Settlement of Rigid Circular Foundations during Seismic Shaking in Shaking Table Tests
(American Society of Civil Engineers, 2012)The settlements of structures resting on saturated sand deposits are examined in shaking table tests. Two series of tests are conducted to examine the effects of the duration of seismic shaking and the group effects of ... -
Lateral Earth Pressure Coefficients for Anchored Sheet Pile Walls
(American Society of Civil Engineers, 2012)Conventional methods used for the design of anchored sheet pile walls are based on the lateral force and moment equilibrium of active and passive earth pressures and anchor force. Although it has been known for decades ... -
Modeling Resilient Modulus Hysteretic Behavior with Moisture Variation
(American Society of Civil Engineers, 2012)The changes in subgrade moisture conditions play an important role in the in-service performance of a pavement. These conditions are sensitive to environmental conditions, such as a rise in the water table, precipitation, ... -
Coupled Hydro-Mechanical Elastoplastic Constitutive Model for Unsaturated Sands and Silts. I: Formulation
(American Society of Civil Engineers, 2012)Unsaturated soils are three-phase porous media consisting of a solid skeleton, pore water, and pore air. The behavior of unsaturated soils is strongly influenced by the matric suction (pore air pressure minus the pore water ... -
Calibration of Soil Model Parameters Using Particle Swarm Optimization
(American Society of Civil Engineers, 2012)In this paper, a neuro-fuzzy model in conjunction with particle swarm optimization (PSO) are used for calibration of soil parameters used within a linear elastic-hardening plastic constitutive model with the Drucker-Prager ... -
Consolidation Behavior of Soils Subjected to Asymmetric Initial Excess Pore Pressure Distributions with One-Way Drainage
(American Society of Civil Engineers, 2012)A consolidating clay layer can be singly or doubly drained. The degree of consolidation is a function of the initial excess pore pressure distribution and the drainage conditions. Traditional geotechnical engineering ... -
Geotechnical Centrifuge Modeling of Chloride Diffusion through Soils
(American Society of Civil Engineers, 2012)Geotechnical centrifuge modeling provides a means of accelerating the transport of contaminants through a soil matrix. Contaminant transport mechanisms occurring in the geotechnical centrifuge model can be used to verify ... -
Assessment of Potential for Seepage-Induced Unraveling Failure of Flow-Through Rockfill Dams
(American Society of Civil Engineers, 2012)A purely numerical parametric study of 24 flow-through rockfill dam geometries was conducted. The nonlinear nature of the p-LaPlacian–like partial differential equation was dealt with using a finite-difference scheme that ... -
Design Guide for Rigid Foundation Systems on Expansive Soils
(American Society of Civil Engineers, 2012)Expansive soils pose a major nightmare for practicing geotechnical engineers in the semiarid and arid zones of the world. The introduction of rigid substructure is a costly approach but can be made practical and financially ... -
Stress-Strain-Volume Change Modeling of Delhi Silt in Triaxial Compression and Extension
(American Society of Civil Engineers, 2012)This study investigates the drained stress-strain-volume change behavior of Delhi silt under triaxial compression and extension loading conditions using two different existing constitutive models, the hardening soil (HS) ... -
Refined True Triaxial Apparatus for Testing Unsaturated Soils under Suction-Controlled Stress Paths
(American Society of Civil Engineers, 2012)This paper introduces a servocontrolled true triaxial apparatus that has been developed to test cubical specimens [with 7.62 cm (3 in.) sides] of unsaturated soil under controlled-suction states and for a wide range of ... -
Prediction of Field Hydraulic Conductivity of Clay Liners Using an Artificial Neural Network and Support Vector Machine
(American Society of Civil Engineers, 2012)This paper describes the application of artificial neural network (ANN) and support vector machine (SVM) methods for prediction of field hydraulic conductivity of clay liners based on in situ test results such as compaction ... -
Hydromechanical Postclosure Behavior of a Deep Tunnel Taking into Account a Simplified Life Cycle
(American Society of Civil Engineers, 2012)This paper addresses the hydromechanical postclosure behavior of an underground long cylindrical deep tunnel drilled into a massif (host medium) and backfilled at the end of its service life. It is concerned with the ...