Showing papers in "Canadian Geotechnical Journal in 2005"
TL;DR: In this article, a generalized thermal conductivity model for moist soils was developed based on the concept of normalized thermal conductivities with respect to dry and saturated states, and the model was applied to the problem of water harvesting.
Abstract: This paper intends to develop a generalized thermal conductivity model for moist soils that is based on the concept of normalized thermal conductivity with respect to dry and saturated states. This...
584 citations
TL;DR: In this paper, the authors describe the entrainment of path material is an important feature of many rapid landslides and the associated increases in volume and changes in flow character can significantly influence mobility.
Abstract: Entrainment of path material is an important feature of many rapid landslides. The associated increases in volume and changes in flow character can significantly influence mobility. A simple materi...
313 citations
TL;DR: In this paper, a numerical model was developed to simulate the response of three instrumented, full-scale, geosynthetic-reinforced soil walls under working stress conditions.
Abstract: The paper describes a numerical model that was developed to simulate the response of three instrumented, full-scale, geosynthetic-reinforced soil walls under working stress conditions. The walls we...
276 citations
TL;DR: A review of hysteresis models for soil-water characteristic curves is presented in this paper, which can be categorized into two groups: (i) domain models (or physically based models) and (ii) empirical mod...
Abstract: A review of hysteresis models for soil-water characteristic curves is presented. The models can be categorized into two groups: (i) domain models (or physically based models) and (ii) empirical mod...
247 citations
TL;DR: In this paper, the problems related to unsaturated soils are frequently encountered in geotechnical or environmental engineering works in most cases, for simplicity, one can study the problems by considering the suc...
Abstract: Problems related to unsaturated soils are frequently encountered in geotechnical or environmental engineering works. In most cases, for simplicity, one can study the problems by considering the suc...
233 citations
TL;DR: Rainfall-induced landslides are a common problem in residual soil slopes of the tropics and it is widely known that rainfall-induced slope failures are mainly caused by infiltration of rainwater as discussed by the authors.
Abstract: Rainfall-induced landslides are a common problem in residual soil slopes of the tropics. It is widely known that rainfall-induced slope failures are mainly caused by infiltration of rainwater; howe...
220 citations
TL;DR: In this article, the results of a comprehensive laboratory study on the thermal conductivity of dense and broadly graded coarse base-course materials used in pavements were presented, and the results showed that the materials were selected based on their thermal properties.
Abstract: This paper presents the results of a comprehensive laboratory study on the thermal conductivity of dense and broadly graded coarse base-course materials used in pavements. Materials were selected f...
188 citations
TL;DR: In this paper, a system of vertical drains combined with vacuum preloading is presented as an effective method to accelerate soil consolidation by promoting radial flow, and the analytical modeling of vertical drain systems is presented.
Abstract: A system of vertical drains combined with vacuum preloading is an effective method to accelerate soil consolidation by promoting radial flow. This study presents the analytical modeling of vertical...
171 citations
TL;DR: A system of vertical drains, with a surcharge load to accelerate consolidation by shortening the drainage path, is one of the most popular methods of soft ground improvement in this article.
Abstract: A system of vertical drains, with surcharge load to accelerate consolidation by shortening the drainage path, is one of the most popular methods of soft ground improvement. The conventional radial ...
143 citations
TL;DR: In this article, a range of mechanical compression tests were conducted on frozen soil samples at temperatures close to the melting point of ice to determine both the creep and the strength properties under triaxial stress conditions.
Abstract: A range of mechanical compression tests were conducted on frozen soil samples at temperatures close to the melting point of ice to determine both the creep and the strength properties under triaxial stress conditions. The samples were obtained from two rock glaciers in the Swiss Alps. For comparison, additional samples were prepared artificially for testing. The results showed that the minimum creep strain rate increases exponentially with increasing temperature and applied deviatoric stress. The applied strain rate is the main parameter influencing resistance. However, test results show that the micromechanical behaviour is similar for all tests and independent of the applied loading condition. Measurements of the volumetric strain showed that the sample composition has a major influence, so samples with high air void ratios resulted in continuous contraction (i.e., reduction of the sample volume), whereas samples with low volumetric air and ice contents demonstrated dilatant behaviour.Key words: permafr...
136 citations
TL;DR: With the use of creep and constant strain rate (CSR) tests, mathematical formulations were found that describe the thermomechanical behaviour of ice-rich frozen soils as discussed by the authors.
Abstract: With the use of creep and constant strain rate (CSR) tests, mathematical formulations were found that describe the thermomechanical behaviour of ice-rich frozen soils. A Glen-type relationship was ...
TL;DR: In this paper, the authors show that electrokinetic decontamination is a promising subsurface decontaminator method, however, it has also been reported that several problems arise, such as such a...
Abstract: Laboratory and in situ test results show that electrokinetic decontamination is a promising subsurface decontamination method. However, it has also been reported that several problems arise, such a...
TL;DR: In this article, the effect of stress state on unsaturated shear strength of a Korean residual soil was studied using modified triaxial tests, and the results showed that the soil-water characteristic curve was not affected by stress state.
Abstract: The effect of stress state on the unsaturated shear strength of a Korean residual soil was studied using modified triaxial tests. Experimental results show that the soil-water characteristic curve ...
TL;DR: A full-scale field experiment has been conducted in an instrumented saprolite slope in Hong Kong as discussed by the authors, where soil moisture probes, tensiometers, piezometers, inclinometers, earth pressure cells, and a rain ga...
Abstract: A full-scale field experiment has been conducted in an instrumented saprolite slope in Hong Kong. Soil moisture probes, tensiometers, piezometers, inclinometers, earth pressure cells, and a rain ga...
TL;DR: In this article, the mechanical response of backfill in narrow openings is significantly influenced by its interaction with the surrounding walls, which is similar to our work on backfilled trenches and mining stopes.
Abstract: The mechanical response of backfill in narrow openings is significantly influenced by its interaction with the surrounding walls. Previous work conducted on backfilled trenches and mining stopes in...
TL;DR: In this paper, the mechanical response of three different types of fine-grained mine tailings was examined using data from constant-volume cyclic direct simple shear (DSS) tests.
Abstract: The mechanical response of three different types of fine-grained mine tailings is examined using data from constant-volume cyclic direct simple shear (DSS) tests. Under cyclic DSS loading, fine-gra...
TL;DR: In this paper, the characteristics of wall deflections and surface ground settlements at six deep multi-strutted excavations in Shanghai soft soils were studied and compared with those of similar case histories.
Abstract: The characteristics of wall deflections and surface ground settlements at six deep multi-strutted excavations in Shanghai soft soils were studied and compared with those of similar case histories r...
TL;DR: Several geophysical techniques (electromagnetic profiling, electrical tomography, seismic refraction tomography and spontaneous potential and seismic noise measurement) were applied in the investi... as mentioned in this paper.
Abstract: Several geophysical techniques (electromagnetic profiling, electrical tomography, seismic refraction tomography, and spontaneous potential and seismic noise measurement) were applied in the investi...
TL;DR: In this article, a case study of using the combined vacuum and fill surcharge preloading method to improve the foundation soil for a storage yard at Tianjin Port, China is presented.
Abstract: This paper presents a case study of using the combined vacuum and fill surcharge preloading method to improve the foundation soil for a storage yard at Tianjin Port, China. A vacuum load of 80 kPa ...
TL;DR: In this paper, a series of tests performed in a drum centrifuge on instrumented model displacement piles in normally consolidated sand was described, where the influence of the pile installation method, the stress level, and the pile aspect ratio on the increase in lateral effective stress on the pile shaft during static load testing to failure was examined.
Abstract: The paper describes a series of tests performed in a drum centrifuge on instrumented model displacement piles in normally consolidated sand. These tests examined the influence of the pile installation method, the stress level, and the pile aspect ratio on the increase in lateral effective stress on the pile shaft during static load testing to failure. A parallel series of constant normal load and constant normal stiffness (CNS) laboratory interface shear experiments was performed to assist interpretation of the centrifuge tests. It is shown that although the cycling associated with pile installation results in a progressive reduction in the stationary horizontal effective stress acting on a pile shaft and densification of the sand in a shear band close to the pile shaft, this sand dilates strongly during subsequent shearing to failure in a static load test. The dilation (the amount of which depends on the cyclic history) is constrained by the sur- rounding soil and therefore leads to large increases in lateral effective stresses and hence to large increases in mobi- lized shaft friction. The increase in lateral stress is shown to be related to the radial stiffness of the soil mass constraining dilation of the shear band and to be consistent with measurements made in appropriate CNS interface shear tests. The paper's findings assist in the extrapolation of model-scale pile test results to full-scale conditions.
TL;DR: A concise algorithm is proposed in this paper for the calculation of the factor of safety of a slope using the Morgenstern-Price method, based on force and moment equilibrium considerations, which possesses the advantages of simplicity and high efficiency in application.
Abstract: A concise algorithm is proposed in this paper for the calculation of the factor of safety of a slope using the MorgensternPrice method. Based on force and moment equilibrium considerations, two ex...
TL;DR: The potential benefits of geocell reinforcement in soft clay foundations have been studied by a series of laboratory-scale static load tests on a rigid circular footing placed on a fill surface.
Abstract: The potential benefits of geocell reinforcement in soft clay foundations have been studied by a series of laboratory-scale static load tests on a rigid circular footing placed on a fill surface. Parameters of the test program include depth of placement of the geocell layer, width and height of the geocell layer, and influence of an additional layer of planar geogrid at the base of the geocell mattress. With the provision of geocell reinforcement, the load-carrying capacity of the soft clay foundation can be improved by a factor of up to 4.8 times that of the unreinforced soil. Heaving of the soil can be reduced substantially by providing geocell reinforcement of sufficient height and width. Further improvement in performance could be obtained with the provision of an additional layer of planar geogrid at the base of the geocell mattress.
TL;DR: In this article, a numerical analysis is presented to model the cone penetration test (CPT) tip resistance in layered soil and analyses are performed for two-layer soils composed of either sands with different relativ...
Abstract: A numerical analysis is presented to model the cone penetration test (CPT) tip resistance in layered soil. Analyses are performed for two-layer soils composed of either sands with different relativ...
TL;DR: In this article, the authors investigated the cyclic loading response of loose Fraser River sand as input to numerical simulation of centrifuge physical models, using constant-volume direct simple shear tests conducted with a...
Abstract: Cyclic loading response of loose Fraser River sand was investigated, as input to numerical simulation of centrifuge physical models, using constant-volume direct simple shear tests conducted with a...
TL;DR: In this article, a method for predicting the behavior of shallow footings bearing on an upper layer of processed cemented soil that overlies a lower layer of weakly bonded residual soil with a high void ratio was proposed.
Abstract: This work proposes a method for predicting the behavior of shallow footings bearing on an upper layer of processed cemented soil that overlies a lower layer of weakly bonded residual soil with a high void ratio The paper describes the results of a series of field plate tests and numerical simulations The results lead to a semi-empirical method for designing shallow foundations on a double-layer system The method has been validated by comparison of predicted values with results from a separate series of plate-loading tests For engineering practice, the proposed method provides acceptable predictions of bearing capacities and loadsettlement curvesKey words: footings, cemented layer, layered system, weakly bonded, high void ratio
TL;DR: The behavior of deformable unsaturated soils is difficult to characterize with simple relationships as discussed by the authors, namely the soil-water characteristic curve and the hydraulic properties of unsaturated unsaturated soil.
Abstract: The behaviour of deformable unsaturated soils is difficult to characterize with simple relationships. Unsaturated hydraulic properties, namely the soil-water characteristic curve and the hydraulic ...
TL;DR: In this paper, the influence of fines on the frost susceptibility of base-course crushed aggregates was established by laboratory freezing tests simulating closely the thermal conditions in the field, and it was shown that fine imposition had a significant impact on the susceptibility of aggregates to frost.
Abstract: The influence of fines on the frost susceptibility of base-course crushed aggregates was established by laboratory freezing tests simulating closely the thermal conditions in the field. The frost s...
TL;DR: In this paper, the bearing capacity factor for both smooth and rough ring footings using the method of stress characteristics was determined for both rough and smooth ring footing using the assumption that for a rough footing t...
Abstract: The bearing capacity factor Nγ was determined for both smooth and rough ring footings using the method of stress characteristics. The analysis was based on the assumption that for a rough footing t...
TL;DR: Shaking table tests were performed on five model slopes to examine the effects of the angle and length of the nails and the frequency of excitation on the seismic resistance and failure mechanism.
Abstract: Shaking table tests were performed on five model slopes to examine the effects of the angle and length of the nails and the frequency of excitation on the seismic resistance and failure mechanism o...
TL;DR: In this paper, the frost heave response of quarry fines from several locations in the Province of Quebec was studied in the laboratory using one-dimensional step-freezing tests with free access to water.
Abstract: The frost heave response of quarry fines from several locations in the Province of Quebec was studied in the laboratory using one-dimensional step-freezing tests with free access to water. Comparis...