Showing papers in "Canadian Geotechnical Journal in 2008"
TL;DR: Although a number of constitutive models for unsaturated soils exist in the literature, some fundamental questions have not been fully answered as mentioned in this paper, and there are questions related to (i) the change of the...
Abstract: Although a number of constitutive models for unsaturated soils exist in the literature, some fundamental questions have not been fully answered. There are questions related to (i) the change of the...
288 citations
TL;DR: In this paper, triaxial tests and numerical simulations using the discrete element method (DEM) are combined to explore the underlying mechanisms of the unique behavior of artificially cemented san...
Abstract: In this paper, triaxial tests and numerical simulations using the discrete element method (DEM) are combined to explore the underlying mechanisms of the unique behavior of artificially cemented san...
217 citations
TL;DR: In this paper, the void ratio has been used as a state variable for predicting the liquefaction behavior of soils under the critical state soil mechanics framework, and it has been shown that void ratio is useful in predicting soil liquefactions.
Abstract: Void ratio has traditionally been used as a state variable for predicting the liquefaction behaviour of soils under the critical state soil mechanics framework. Recent publications show that void r...
186 citations
TL;DR: In this paper, small rigid sand particles Ds and large soft rubber particles Drs are prepared at different volume fractions and tested to investigate their small-strain and zero-lateral strain response.
Abstract: Mixtures of small rigid sand particles Ds and large soft rubber particles Dr are prepared at different volume fractions and tested to investigate their small-strain and zero-lateral strain response...
161 citations
TL;DR: In this article, internal instability describes the loss of soil particles as a result of seepage, and two criteria are commonly used to determine the potential for such instability within a granular soil that is subje...
Abstract: Internal instability describes the loss of soil particles as a result of seepage. Two criteria are commonly used to determine the potential for such instability within a granular soil that is subje...
156 citations
TL;DR: In this paper, a detailed investigation of axial performance of helical piles is presented, where axial loads are investigated for both tensile and compressive axial load loads.
Abstract: Helical piles are increasingly used to support and rehabilitate structures subjected to both tensile and compressive axial loads This paper presents a detailed investigation into the axial perform
140 citations
TL;DR: The bender element method is an experimental technique used to determine the small-strain shear modulus (Gmax) of a soil by measuring the velocity of shear wave propagation through a sample as discussed by the authors.
Abstract: The bender element method is an experimental technique used to determine the small-strain shear modulus (Gmax) of a soil by measuring the velocity of shear wave propagation through a sample. Bender...
138 citations
TL;DR: In this paper, the finite element method was used for the determination of the collapse load of a rigid strip footing placed on a uniform layer of purely frictional soil subjected to inclined and eccentric loading.
Abstract: The finite element method is used for the determination of the collapse load of a rigid strip footing placed on a uniform layer of purely frictional soil subjected to inclined and eccentric loading...
127 citations
TL;DR: Pile-supported embankments are increasingly being used for highways, railways, storage tanks, etc. over soft soil because of their effectiveness in accelerating construction and minimizing deformatization as mentioned in this paper.
Abstract: Pile-supported embankments are increasingly being used for highways, railways, storage tanks, etc. over soft soil because of their effectiveness in accelerating construction and minimizing deformat...
118 citations
TL;DR: In this paper, the authors analyse the behavior of pipelines laid on the seabed expand and contract during operating cycles as a result of thermal loading, which can lead to lateral buckling.
Abstract: Pipelines laid on the seabed expand and contract during operating cycles as a result of thermal loading, which can lead to lateral buckling. Analysis of this behaviour requires assessment of the ve...
113 citations
TL;DR: In this article, a case study of the Bolu highway twin tunnels that experienced a wide range of damage during the 1999 Duzce earthquake in Turkey is presented, focusing on a particular section of the tunnel.
Abstract: This paper presents a case study of the Bolu highway twin tunnels that experienced a wide range of damage during the 1999 Duzce earthquake in Turkey. Attention is focused on a particular section of...
TL;DR: In this article, the stability of a slope with reinforcing piles in anisotropic and nonhomogeneous soils is analyzed using the kinematic approach of limit analysis combined with a strength reduction technique.
Abstract: The stability of a slope with reinforcing piles in anisotropic and nonhomogeneous soils is analyzed using the kinematic approach of limit analysis combined with a strength reduction technique. A slope without piles is considered first and the limit state equation is obtained to determine both the safety factor and the critical sliding surface for a given anisotropic and nonhomogeneous slope. The solutions are compared with published data to verify the practicality of the approach. A slope stabilized by a row of piles is then analyzed. Next, mathematical optimization is used to derive analytical expressions for determining the lateral force provided by piles (this is required to increase the slope safety factor to an expected value). Numerical examples are then applied. The optimal location of piles within a slope and the effects of nonhomogeneity and anisotropy of the soil strength on the dimensionless limit stabilizing force are also studied. Finally, a simplified procedure is proposed for a structural d...
TL;DR: The results from a laboratory experimental study on silty sand are presented in this article, where undrained triaxial compression tests were performed on Nevada sand containing nonplastic silt.
Abstract: The results from a laboratory experimental study on silty sand are presented Undrained triaxial compression tests were performed on Nevada sand containing nonplastic silt All specimens underwent
TL;DR: The beam on nonlinear Winkler foundation (BNWF) model is widely used in soil-structure interaction (SSI) analysis owing to its relative simplicity as discussed by the authors, which focuses on the development of a versat...
Abstract: The beam on nonlinear Winkler foundation (BNWF) model is widely used in soil–structure interaction (SSI) analysis owing to its relative simplicity. This paper focuses on the development of a versat...
TL;DR: Reliability-based design concepts and their application to load and resistance factor design (LRFD or limit states design (LSD) in Canada) are well known, and their adoption in geotechnical enginee...
Abstract: Reliability-based design concepts and their application to load and resistance factor design (LRFD or limit states design (LSD) in Canada) are well known, and their adoption in geotechnical enginee...
TL;DR: In this article, the problem of tunneling effects on existing jointed pipelines was studied using the boundary integral method and normalized solutions to evaluate the maximum bending moments and rotations were presented.
Abstract: The problem of tunneling effects on existing jointed pipelines is studied using the boundary integral method. Normalized solutions to evaluate the maximum bending moments and rotations are presented. They depend on tunnel-induced ground settlements at pipeline level, relative soil–pipe stiffness, relative pipe-joint stiffness, and the location of the joints in relation to the tunnel centerline. A jointed pipeline generally experiences smaller bending moments than a continuous one owing to the joint rotation. The solutions indicate that there are certain cases where hinged systems result in greater bending moments than continuous ones. However, these cases rarely occur in reality.
TL;DR: In this paper, the vertical uplift capacity of strip anchors embedded horizontally at shallow depths in sand is examined by using an upper bound limit analysis in conjunction with finite elements and linear progr
Abstract: The vertical uplift capacity of strip anchors embedded horizontally at shallow depths in sand is examined by using an upper bound limit analysis in conjunction with finite elements and linear progr
TL;DR: In this paper, shear banding in Santa Monica beach sand deposited by dry pluviation in hollow cylinder specimens was studied in 34 drained torsion shear tests with rotation of principal stress directions.
Abstract: Shear banding in Santa Monica beach sand deposited by dry pluviation in hollow cylinder specimens is studied in 34 drained torsion shear tests with rotation of principal stress directions. The effe...
TL;DR: In this paper, a study on the seismic active earth pressure behind a nonvertical cantilever retaining wall using pseudo-dynamic analysis is presented, and a planar failure surface has been considered behind the wall.
Abstract: This note describes a study on the seismic active earth pressure behind a nonvertical cantilever retaining wall using pseudo-dynamic analysis. A planar failure surface has been considered behind th...
TL;DR: In this paper, the authors present results from two pairs of centrifuge tests designed to investigate the difference between permanent ground deformation and continuous buried pipelines, and show that permanent deformation is the most severe hazard for continuous buried pipeline.
Abstract: Permanent ground deformation is arguably the most severe hazard for continuous buried pipelines. This paper presents results from two pairs of centrifuge tests designed to investigate the differenc...
TL;DR: Shallow-flow integrated numerical models of landslide and avalanche motion have recently experienced rapid development as mentioned in this paper, and an important aspect of model development is verification, to show that models can be verified.
Abstract: Shallow-flow integrated numerical models of landslide and avalanche motion have recently experienced rapid development. An important aspect of model development is verification, to show that models...
TL;DR: In this paper, a scanning electron microscope (SEM) was used to investigate the effect of depositional method and silt content on the performance of a laboratory experimental study on silty sand.
Abstract: The results from a laboratory experimental study on silty sand are presented. A scanning electron microscope (SEM) was used to investigate the effect of depositional method and silt content on the ...
TL;DR: In this article, an experimental laboratory study of the shear modulus -matric suction and moisture content-dry unit weight relationship using three compacted subgrade soils was conducted.
Abstract: The ultimate parameter of interest in engineering design of compacted subgrades and support fills for highways, railroads, airfields, parking lots, and mat foundations is often the soil modulus. Modulus of compacted soils depends not only on dry unit weight and moisture but also on matric suction and soil structure (or fabric) resulting from the compaction process. However, these relationships in the as-compacted state (i.e., immediately after compaction) have not yet been extensively explored. This paper presents an experimental laboratory study of the shear modulus – matric suction – moisture content-dry unit weight relationship using three compacted subgrade soils. Compacted subgrade specimens were prepared over a range of molding water contents from dry to wet of optimum using enhanced, standard, and reduced Proctor efforts. A nondestructive elastic wave propagation technique, known as bender elements, was used to assess the shear wave velocity and corresponding small-strain shear modulus (Go) of the ...
TL;DR: In this paper, several curve-fitting equations have been proposed for soil-water characteristic curves, which have been of considerable value in geotechnical and geoenvironmental engineering.
Abstract: Numerous curve-fitting equations have been proposed for soil-water characteristic curves. While these equations have been of considerable value in geotechnical and geoenvironmental engineering, the...
TL;DR: In this paper, a closed-form solution for tunnel linings that can be idealized as an inner jointed segmental lining and an outer thick-walled cylinder embedded in a homogeneous infinite elasti...
Abstract: This paper presents a closed-form solution for tunnel linings that can be idealized as an inner jointed segmental lining and an outer thick-walled cylinder embedded in a homogeneous infinite elasti...
TL;DR: In this paper, an iterative procedure is proposed to estimate seismic-induced distortions of cut-and-cover rectangular structures, based on an existing analytical solution for deep rectangular structures.
Abstract: An iterative procedure is proposed to estimate seismic-induced distortions of cut-and-cover rectangular structures. The procedure is based on an existing analytical solution for deep rectangular st...
TL;DR: Shallow foundation designs are typically governed either by settlement, a serviceability limit state, or by bearing capacity, an ultimate limit state as discussed by the authors, where the bearing capacity is a function of the serviceability of the foundation.
Abstract: Shallow foundation designs are typically governed either by settlement, a serviceability limit state, or by bearing capacity, an ultimate limit state. While geotechnical engineers have been designi...
TL;DR: In this paper, the authors extend the experimental validation of the S-CLAY1 model, which is a recently proposed elastoplastic constitutive model that accounts for initial and plastic strain-induce.
Abstract: The aim of the paper is to extend the experimental validation of the S-CLAY1 model, which is a recently proposed elastoplastic constitutive model that accounts for initial and plastic strain-induce...
TL;DR: In this article, the response of the pile foundation is affected by factors such as soil and pile yield, and the response is also influenced by the load on the pile itself, such as axial and lateral cyclic loading.
Abstract: Pile foundations are generally designed to resist both axial and lateral loads. Under lateral cyclic loading, the response of the pile foundation is affected by factors such as soil and pile yieldi...
TL;DR: In this article, a study of 45 large slow-moving landslides was conducted and it was shown that for a landslide to travel slowly after failure, the sliding is most likely to be active or reactivated, on a basal rupture surface at or close to residual strength.
Abstract: Based on a study of 45 large slow-moving landslides, it is apparent that for a landslide to travel slowly after failure, the sliding is most likely to be active or reactivated, on a basal rupture surface at or close to residual strength. The likelihood of slow movement after failure is also increased when the inclination of the basal rupture surface is less than the residual friction angle. The slow-moving landslides are all of low rock-mass strength with varying degrees of disaggregation, or they possess soil strength. The influence of lateral margins on landslide restraint is generally small, with landslide movement typically controlled by fluctuations in piezometric pressure. The most commonly observed slow large landslides are mudslides and translational debris–rock slides, followed by particular forms of translational rock slides and internally sheared compound slides. Some mudslides display evidence of short periods of up to moderate velocities.